CN116428291B

CN116428291B - Braking mechanism of brake and brake

Info

Publication number: CN116428291B
Application number: CN202310642058.5A
Authority: CN
Inventors: 田鹏; 陈昌微
Original assignee: LONGZHONG HOLDING GROUP CO LTD
Current assignee: LONGZHONG HOLDING GROUP CO LTD
Priority date: 2023-06-01
Filing date: 2023-06-01
Publication date: 2025-07-08
Anticipated expiration: 2043-06-01
Also published as: CN116428291A

Abstract

The invention provides a braking mechanism of a brake and the brake, and belongs to the technical field of brakes. The automobile parking brake device solves the problems that the service brake is limited and the safety is reduced due to the fact that the parking brake is arranged in an existing brake mechanism. The braking mechanism of the brake comprises a screw rod, a nut and a braking motor, wherein a mandrel is arranged at the rear of the screw rod, an electromagnet is fixed at the rear of the mandrel, a sliding seat which is driven by a parking spring and can push the screw rod to move is sleeved on the mandrel, a locking structure which can lock the sliding seat on the mandrel is arranged between the sliding seat and the mandrel, an unlocking piece is arranged between the electromagnet and the locking structure, and when the electromagnet is powered off, the unlocking piece can act on the locking structure to unlock the sliding seat on the mandrel, and when the electromagnet is powered on, the unlocking piece is attracted on the electromagnet and releases the locking structure. The braking mechanism can realize service braking and parking braking, and the realization of the parking braking does not influence the service braking, so that the use safety of the brake is improved.

Description

Braking mechanism of brake and brake

Technical Field

The invention belongs to the technical field of brakes, and relates to a braking mechanism of a brake and the brake.

Background

The brake system is a system for forcibly reducing the movement speed of the sporting goods. On vehicles, braking is typically performed by brakes, including disc brakes, drum brakes, and the like. The brake can be classified into pneumatic, hydraulic and electronic type according to the power source. The electronic brake is generally braked by motor drive, and the electronic brake is braked stably when working normally, but when a vehicle system is in a power failure state, the braking failure is easy to occur, and the safe use of the vehicle is affected.

The existing electronic brake is generally provided with a power-losing parking structure so as to prevent braking failure when power losing occurs. A parking brake mechanism of a disc brake disclosed in Chinese patent document [ application number: CN201711248739.4, bulletin number: CN 109869424B ] comprises a shell, a motor, a coil spring bushing, a plane scroll spring, an electromagnetic clutch and a rotating shaft. The housing is mounted to the end of the vehicle brake assembly for support. The rotating shaft is coaxially arranged with the shell through a bearing, the stator of the motor is fixedly connected with the shell, and a shifting fork arranged on the rotor of the motor is fixedly connected with the rotating shaft. The coil spring bushing is coaxially arranged with the shell through a bearing, and the coil spring bushing is sleeved on the rotating shaft in an empty mode. The plane scroll spring is arranged between the shell and the coil spring bushing, and the plane scroll spring is sleeved outside one end of the coil spring bushing. The electromagnetic clutch is arranged between the shell and the coil spring bushing, and is connected with the coil spring bushing and rotates synchronously. The inner ring of the coil spring bushing is provided with two bosses which are 180 degrees away from each other and are distributed in an axial staggered way, and the bosses are contacted with bosses on a shifting fork of the motor and are used for driving the shifting fork to rotate.

The brake is provided with a brake transmission mechanism, the rotor is connected with the brake transmission mechanism, and the brake is driven to brake through the brake transmission mechanism when the rotor rotates. When the parking brake is released, the motor is required to rotate reversely to enable the boss on the rotor shifting fork to be abutted against the boss on the coil spring bushing to drive the flat coil spring to tighten and store energy, and the electromagnetic clutch is electrified to lock the coil spring bushing after the flat coil spring is tightened and stores energy is completed. When in service braking, the power source is a motor, at the moment, the electromagnetic clutch is electrified to lock the coil spring bushing, the motor drives the rotating shaft to rotate positively to carry out service braking, and the motor rotor can only rotate for half a circle at most due to the limitation of the rotation angle caused by the interference of the boss on the rotor shifting fork and the boss on the coil spring bushing, so that the braking force is limited when in running, and the service braking is limited.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a brake mechanism and a brake of the brake, which solve the technical problem that the service braking is limited and the safety is reduced due to the arrangement of parking braking in the conventional brake mechanism.

The aim of the invention can be achieved by the following technical scheme:

The utility model provides a brake mechanism of stopper, includes screw and nut and the brake motor that can drive the nut rotation and make screw back-and-forth movement mutually supporting, its characterized in that still includes fixed dabber, the dabber is located the rear of screw, the rear of dabber is fixed with the electro-magnet, the cover is equipped with the sliding seat that can slide and can promote the screw removal around on the dabber, be provided with the locking structure that can make the sliding seat lock at the dabber between sliding seat and the dabber, be provided with the unblock piece between electro-magnet and the locking structure, when the electro-magnet outage the unblock piece can be used in the locking of locking structure messenger sliding seat at the dabber and release locking structure, be connected with on the sliding seat and can drive the parking spring of sliding seat forward after sliding seat and dabber release locking.

The brake is provided with two braking plates which are oppositely arranged, the two braking plates are positioned between the braking discs, the front end of the screw rod is fixedly provided with a pushing disc, the pushing disc is abutted against one of the braking plates, and the screw rod pushes the braking plates to brake when moving forwards. When the vehicle is electrified and normally used, when the service braking is needed, the braking motor rotates forward to drive the screw rod to move forward to brake, when the service braking is needed to be released, the braking motor rotates reversely to drive the screw rod to move backward to reset, the electromagnet keeps the electrified state, the unlocking piece can be attracted onto the electromagnet to release the locking structure, the locking structure can lock the sliding seat on the mandrel, the sliding seat can not prevent the screw rod from moving forward, namely the number of rotation turns of the braking motor to drive the screw rod to move forward is not limited, and meanwhile, the parking spring stores elastic potential energy for driving the sliding seat to slide forward. When the vehicle is powered off or needs parking braking, the electromagnet is powered off, the unlocking piece acts on the locking structure to unlock the sliding seat on the mandrel, and after unlocking the sliding seat and the mandrel, the parking spring acts on the sliding seat to drive the sliding seat to slide forwards, and the sliding seat slides forwards and acts on the screw rod to drive the screw rod to move forwards, so that the braking piece brakes. When the vehicle is powered back or the parking brake needs to be released, the electromagnet is powered on, the unlocking piece is attracted to the electromagnet and releases the locking structure, so that the locking structure can lock the sliding seat on the mandrel again, then the braking motor reversely rotates to drive the screw rod to move backwards, the screw rod is reacted on the sliding seat to drive the sliding seat to move backwards for resetting, when the sliding seat is reset in place, the locking structure locks the sliding seat on the mandrel again, and the parking spring stores elastic potential energy again.

After the braking mechanism is used, parking braking and emergency braking can be realized through mechanical braking, the rotation number of turns of a braking motor can not be influenced by a sliding seat during service braking, namely, the braking force during running braking can not be limited by the sliding seat, and the safety of service braking is improved. Therefore, the braking mechanism can realize service braking and parking braking (or power-off emergency braking), and the service braking is not affected by the implementation of the parking braking, so that the use safety of the brake is improved.

In the braking mechanism of the brake, the locking structure comprises the lock ring sleeved on the sliding seat, a locking spring capable of driving the lock ring to slide backwards is connected between the lock ring and the sliding seat, the unlocking piece can lean against the lock ring and push the lock ring to slide forwards after the electromagnet is powered off, a locking groove is formed in the outer side face of the mandrel, a through hole corresponding to the locking groove is formed in the side wall of the sliding seat, an avoidance groove is formed in the inner side face of the lock ring, a locking ball is arranged in the through hole, when the sliding seat slides to the position where the through hole is opposite to the locking groove and the lock ring slides to the position where the avoidance groove is located behind the through hole, the inner side portion of the locking ball is embedded into the locking groove and the outer side portion of the locking ball is abutted against the inner side face of the lock ring, and when the lock ring slides forwards to the avoidance groove and the through hole are opposite to each other, the inner side portion of the locking ball can be separated from the locking groove and the outer side portion of the locking ball is embedded into the avoidance groove.

When the vehicle is electrified and normally used, the through hole of the sliding seat is aligned with the locking groove, the inner side part of the locking ball is embedded into the locking groove, and meanwhile, the locking ring slides to the back of the through hole under the action of the locking spring, and the outer side part of the locking ball abuts against the inner side surface of the front end of the locking ring, so that the sliding seat is locked on the mandrel. When the power is lost or the parking braking is carried out, the ferromagnetic iron is powered off, the unlocking piece pushes the lock ring to slide forwards, so that the avoidance groove is opposite to the perforation, at the moment, the locking ball is not limited by the lock ring in the radial direction, namely, the locking of the sliding seat on the mandrel is released, the sliding seat slides forwards under the action of the parking spring, the locking ball moves outwards in the radial direction, namely, the inner side part of the locking ball is separated from the locking groove, and the outer side part of the locking ball is embedded into the avoidance groove. When the vehicle is powered on or the parking brake needs to be released, the electromagnet is electrified, the unlocking piece is attracted to the electromagnet and releases the locking ring, then the braking motor reversely rotates to drive the screw rod to move backwards, the screw rod reversely acts on the sliding seat to drive the sliding seat to move backwards to reset, meanwhile, the locking spring acts on the locking ring to enable the locking ring to slide backwards, and when the sliding seat slides until the through hole is in alignment with the locking groove, the locking ring acts on the outer side part of the locking ball to enable the inner side part of the locking ball to be embedded into the locking groove to form locking. Therefore, the parking brake (or the power-off emergency brake) and the reset of the parking brake (or the power-off emergency brake) can be realized, the service brake is not influenced by the realization of the parking brake (or the power-off emergency brake), and the use safety of the brake is ensured.

In the braking mechanism of the brake, the locking spring is sleeved on the sliding seat, a protective sleeve fixed on the sliding seat is sleeved on the outer side of the locking spring, and the parking spring is sleeved on the outer side of the protective sleeve. The protective sleeve separates the locking spring and the parking spring, prevents mutual interference of the locking spring and the parking spring, ensures that the locking structure and the parking spring work stably, ensures that the parking brake work stably and simultaneously is beneficial to avoiding the influence of the realization of the parking brake on the service brake, and ensures the use safety of the brake.

In the braking mechanism of the brake, a front abutting ring is arranged at the front end of the sliding seat, a rear abutting ring is arranged at the rear end of the mandrel, and two ends of the parking spring respectively abut against the front abutting ring and the rear abutting ring. Therefore, when the sliding seat moves backwards to reset, the parking spring can automatically adapt to compression deformation to store elastic potential energy for driving the sliding seat to slide forwards, parking braking or power-off emergency braking can be repeatedly performed, and the use safety of the brake is guaranteed.

In the braking mechanism of the brake, the unlocking piece comprises an attraction disc capable of being attracted to the electromagnet, a protruding ejector rod is arranged on the front end face of the attraction disc, and the ejector rod is opposite to the rear end face of the locking ring after penetrating through the abutting ring. The ejector rod is arranged in the rear supporting ring in a penetrating way and has guiding and limiting effects, so that the unlocking piece is prevented from overturning in the moving process, the parking brake is stable in operation, the use safety of the brake is ensured, and meanwhile, the brake mechanism is compact and stable in structure.

In the braking mechanism of the brake, a fixing bolt is fixedly connected between the shell of the electromagnet and the mandrel, and the suction disc is sleeved on the fixing bolt. The fixing bolt not only can be used for fixedly connecting the electromagnet with the mandrel, but also has a positioning and guiding function on the unlocking piece, so that the unlocking piece slides stably, the smooth progress of parking braking or power-off emergency braking is facilitated, and the use safety of the brake is ensured.

In the braking mechanism of the brake, a pushing spring is connected between the shell of the electromagnet and the unlocking piece, and when the electromagnet is powered off, the pushing spring can drive the unlocking piece to move forwards and act on the locking structure. The pushing spring works stably, elastic potential energy can be compressed and stored when the electromagnet is electrified to attract the unlocking piece, smooth progress of parking braking or power-failure emergency braking is guaranteed, and safety of using of the brake is guaranteed.

In the braking mechanism of the brake, the rear end of the lead screw is in threaded connection with the compensation screw, the rear end of the compensation screw extends out of the lead screw and is provided with the clutch ring, the rear end of the compensation screw is provided with the clamping ring, the clutch ring is sleeved with the clutch sleeve capable of sliding forwards and backwards, the clutch spring is connected between the clamping ring and the clutch sleeve, the inner side surface of the clutch sleeve is provided with the convex ring, the convex ring is positioned between the clamping ring and the clutch ring, the convex ring can be abutted against the clutch ring and form an engagement state under the action of the clutch spring, the rear end of the clutch sleeve protrudes out of the rear end face of the compensation screw and is abutted against the sliding seat when the convex ring is abutted against the clutch ring, the driving gear and the driven gear which are meshed with each other are arranged between the brake motor and the nut, the driven gear is sleeved on the outer side of the nut and is circumferentially fixed and axially limited with the nut, the rear end of the driven gear extends backwards to form an extension sleeve part, the extension sleeve part is arranged on the outer side of the clutch sleeve and forms circumferential fixed and axially sliding fit with the clutch sleeve, and the thread tooth direction of the compensation screw is the same as the lead screw of the compensation screw.

The compensating screw, the clutch sleeve and the clutch spring form a clutch. When the driving braking is carried out, the braking motor drives the driving gear to rotate, the driving gear drives the driven gear and the nut to rotate, the screw rod moves forwards under the drive of the nut, the driven gear rotates to drive the clutch sleeve to rotate through the extension sleeve part, at the moment, under the action of the clutch spring, the convex ring is tightly abutted against the clutch ring to enable the compensation screw rod and the clutch sleeve to be in an engagement state, and the clutch sleeve rotates to drive the compensation screw rod to synchronously rotate. Likewise, upon return of service brake, the compensating screw and clutch sleeve remain engaged, the compensating screw being held stationary axially relative to the slide and spindle.

When the vehicle is powered off or needs to carry out parking braking, as the rear end of the clutch sleeve protrudes out of the rear end face of the compensation screw, the sliding seat forwards slides and firstly abuts against the rear end of the clutch sleeve to enable the clutch sleeve to forwards slide, at the moment, the convex ring is separated from the clutch ring, and then the sliding seat abuts against the rear end face of the compensation screw to continuously push the compensation screw and the screw rod to forwards move. The clutch spring is arranged to form a clutch function, and has a certain buffer function when the parking brake is carried out, so that the parking brake or the power-off emergency brake is stably carried out, and the safety of the brake operation is guaranteed.

When the parking brake or the emergency power-off brake is reset, the brake motor reversely drives the driven gear and the nut to reversely rotate, the sliding seat still abuts against the rear end face of the clutch sleeve and the rear end face of the compensation screw, the convex ring and the clutch sleeve are kept in a separated state, the compensation screw does not rotate along with the driven gear, and the compensation screw and the screw are kept fixed and synchronously move backwards. Until the sliding seat is locked on the mandrel, the parking brake or the emergency power-off brake is reset, the brake motor stops working at the moment, the rear end of the clutch sleeve keeps abutting on the sliding seat under the action of the clutch spring, and the compensation screw rod moves forwards to enable the convex ring and the clutch ring to abut on again and restore the joint state. And then the braking motor rotates forward to perform normal service braking.

When the vehicle is not braked and is in normal running, a braking gap is formed between the brake pad and the brake disc, the braking gap is called initial braking gap, when the vehicle is braked, the nut rotates to drive the screw rod to move forwards, the braking gap is continuously reduced until the brake pad is abutted against the brake disc to enable the braking gap to disappear, braking force is generated between the brake pad and the brake disc, friction and abrasion can occur on the brake pad in the braking process, and the abrasion amount is assumed to be delta X. In order to keep the initial braking clearance constant, the compensation screw rod can extend by delta X more than the screw rod by less delta N turns when the braking motor rotates reversely, namely the axial total length of the compensation screw rod and the screw rod is increased by delta X after the braking of the running vehicle is released, and the compensation screw rod is used for compensating the abrasion amount, so that the clutch sleeve and the sliding seat are kept against each other under the condition that the initial braking clearance is kept constant, namely the distance between the rear end surface of the compensation screw rod and the sliding seat is kept constant, and the forward extending amount of the screw rod is kept constant during the parking braking, so that the braking force of the parking braking is kept constant, the stability of the parking braking is ensured, and the use safety of the brake is improved.

In the braking mechanism of the brake, the clutch spring is a disc spring. The disc spring is convenient to install and enables the clutch sleeve to be stressed stably.

In the braking mechanism of the brake, the front end face of the clutch ring is abutted against the rear end face of the convex ring under the action of the clutch spring, the front end face of the clutch ring is a ball conical surface, the rear end face of the convex ring is a conical surface, an end face bearing is further arranged between the clutch spring and the clutch sleeve, and the rear end face of the clutch sleeve is an arc-shaped surface protruding backwards. The front end surface of the clutch ring is a ball conical surface, and the rear end surface of the convex ring is a conical surface, so that the joint state between the clutch ring and the convex ring can be stable. When the parking brake is reset or the power-failure emergency brake is reset, the rear end face of the clutch sleeve and the rear end face of the compensation screw rod are propped against the sliding seat, the convex ring on the clutch sleeve and the clutch ring of the compensation screw rod are in a separation state, and at the moment, the brake motor rotates to drive the driven gear to rotate, so that the clutch sleeve rotates, and the arrangement of the end face bearing and the arc-shaped surface can prevent the clutch sleeve from rotating to cause the rotation of the compensation screw rod and the sliding seat, so that the brake mechanism works stably.

In the braking mechanism of the brake, the driven gear is provided with a force sensor for measuring the abrupt change of the axial force of the driven gear. The force transducer is a micro switch, a tact switch or a diaphragm switch. When the driving brake is operated, the forward rotation of the brake motor drives the screw rod to move forward, so that the axial force borne by the driven gear suddenly increases when the brake pad abuts against the brake disc, the force sensor generates a brake start signal to an EMB control unit of the vehicle, the EMB control unit records the position of the rotating shaft of the brake motor at the moment and determines a brake zero position, the brake zero position is taken as a starting point, and the brake motor continuously rotates for N1 circles to achieve the required braking force. When the braking force is released after the service braking is finished, the EMB control unit controls the braking motor to reversely rotate for N1+N0 cycles and then stops working, and the braking is finished, wherein the braking gap between the braking sheet and the braking disc is delta=N1+N0-N1=N0, and N0 is the initial braking gap. After the arrangement, the brake can automatically eliminate the braking gap generated by abrasion between the brake pad and the brake disc, so that the initial braking gap is kept constant.

The brake comprises a caliper body and a brake pad, and is characterized by further comprising the brake mechanism, wherein a push disc abutted against the brake pad is fixed at the front end of the lead screw.

The brake mechanism is arranged in the brake, parking braking and power-off emergency braking can be realized through mechanical braking, the rotation circle number of the brake motor can not be influenced by the sliding seat during service braking, namely, the braking force during running braking can not be limited by the sliding seat, and the safety of service braking is improved while the parking braking is realized.

Compared with the prior art, the invention has the following advantages:

1. The braking mechanism is provided with the sliding seat, the mandrel, the locking structure, the unlocking piece, the parking spring and the electromagnet, and then the parking braking and the power-losing emergency braking can be realized through mechanical braking, and the realization of the parking braking and the power-losing emergency braking can not influence the service braking, so that the safety of the vehicle is improved.

2. The brake mechanism is compact in structural arrangement and stable in operation.

3. The compensation screw rod, the clutch sleeve and the clutch spring are arranged, the clutch sleeve is connected with the driven gear, the braking force of the parking brake is kept constant under the condition that the initial braking gap is kept constant, and the stability of the parking brake or the power-off brake is ensured.

Drawings

Fig. 1 is a cross-sectional view of a first embodiment of the present brake.

Fig. 2 is an enlarged view of a portion of the slide mount and electromagnet of fig. 1.

Fig. 3 is an enlarged view of a portion of the clutch sleeve of fig. 1.

Fig. 4 is a cross-sectional view at A-A in fig. 3.

Fig. 5 is a positional relationship diagram of the lock structure after parking braking or power-off emergency braking by the present brake mechanism.

Fig. 6 is a sectional view of the present brake after compensating for the amount of brake pad wear.

In the figure, 1, a clamp body, 2, a brake block, 3, a bracket, 4, a push disc, 5, a lead screw, 6, a nut, 7, a brake motor, 8, a mounting shell, 9, a driving gear, 10, a driven gear, 10a, an extension sleeve part, 11, a compensation screw, 11a, a clutch ring, 12, a clutch sleeve, 12a, a convex ring, 13, a thrust bearing, 14, a limit sleeve, 15, a force sensor, 16, a transition sleeve, 17, a mandrel, 17a, a locking groove, 17b, a rear abutting ring, 18, an electromagnet, 19, a sliding seat, 19a, a perforation, 19b, a front abutting ring, 20, an unlocking piece, 20a, an actuating disc, 20b, a push rod, 21, a parking spring, 22, a backup groove, 23, a locking spring, 24, a locking ball, 25, a protective sleeve, 26, an end cover, 27, a fixing bolt, 28, a pushing spring, 29, a clamping ring, 30, a clutch spring, 31, an end face bearing, 32 and a clearance spring.

Detailed Description

The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

Example 1

As shown in fig. 1, a brake comprises a caliper body 1, a brake pad 2, a bracket 3 and a brake mechanism, wherein the brake mechanism can drive the brake pad 2 to move so as to realize braking. The main structure of the brake is an existing floating caliper disc brake, two brake blocks 2 are arranged on a bracket 3 separately, a sliding rod is arranged between the bracket 3 and a caliper body 1, the bracket 3 is used for being fixed with a frame, the sliding rod is fixed on the bracket 3, the sliding rod penetrates through the caliper body 1, and the caliper body 1 can slide along the sliding rod. The structure of the floating caliper disc brake can be referred to in patent documents with publication numbers CN1370701A or CN 2818904Y. The brake disc is fixed on the axle, two brake blocks 2 are respectively positioned at two sides of the brake disc, and the two brake blocks 2 are abutted against the brake disc to form braking force.

As shown in fig. 1, a braking mechanism of a brake comprises a screw 5 and a nut 6 which are matched with each other, and a braking motor 7 capable of driving the nut 6 to rotate so as to enable the screw 5 to move forwards and backwards, wherein a pushing disc 4 abutted against one of brake blocks 2 is fixed at the front end of the screw 5, the pushing disc 4 is circumferentially fixed with a caliper body 1, and the pushing disc 4 can slide forwards and backwards in the caliper body 1 along an axial direction. In order to reduce the frictional resistance, the screw 5 may be selected as a ball screw, and the nut 6 may be correspondingly selected as a ball nut 6. The rear end of the clamp body 1 is fixedly provided with a mounting shell 8, and the clamp body 1 and the mounting shell 8 enclose a mounting cavity. A driving gear 9 and a driven gear 10 which are meshed with each other are arranged between the brake motor 7 and the nut 6, the lead screw 5, the nut 6, the driving gear 9 and the driven gear 10 are all installed in the installation cavity, the brake motor 7 is fixed outside the installation shell 8 and is positioned behind the driving gear 9, and the rotating shaft of the brake motor 7 is fixedly connected with the driving gear 9. The driven gear 10 is sleeved on the outer side of the nut 6 and is connected with the nut 6, and the driven gear 10 and the nut 6 can be circumferentially fixed through a spline or a flat key. The rear end of the driven gear 10 extends backwards to form an extension sleeve part 10a, the rear end of the screw rod 5 is connected with a compensation screw rod 11 in a threaded mode, the rear end of the compensation screw rod 11 extends out of the screw rod 5, a clutch sleeve 12 is sleeved outside the rear end of the compensation screw rod 11, and the rear end of the extension sleeve part 10a is sleeved outside the clutch sleeve 12. The extending sleeve part 10a is provided with a stop shoulder positioned at the rear of the nut 6, a retainer ring is fixedly clamped at the front of the nut 6 on the driven gear 10, and the nut 6 is axially limited between the retainer ring and the stop shoulder.

The driven gear 10 is provided with a load cell 15 for measuring abrupt axial force changes of the driven gear 10. The load cell 15 is a micro switch or a tact switch or a membrane switch. Taking the force transducer 15 as a diaphragm switch for example, a shoulder is arranged at the rear of the shoulder on the mounting shell 8, a thrust bearing 13, a limit sleeve 14, a diaphragm switch and a transition sleeve 16 are sequentially arranged between the shoulder and the shoulder from front to back, the diaphragm switch is fixed on the rear end face of the limit sleeve 14 and can be in contact with the transition sleeve 16, a gap spring 32 is arranged between the limit sleeve 14 and the transition sleeve 16, and a brake induction gap exists between the limit sleeve 14 and the transition sleeve 16 due to the gap spring 32. When the lead screw 5 moves forwards during braking, when the brake pad 2 is abutted against the brake disc, the axial force applied by the driven gear 10 suddenly increases, so that the diaphragm switch 15 contacts the transition sleeve 16 to generate a braking start signal, when the braking is released, the brake pad 2 is separated from the brake disc, the axial force applied by the driven gear 10 decreases, the braking induction gap is restored under the action of the gap spring 32, and the diaphragm switch 15 is separated from the transition sleeve 16.

As shown in fig. 1,2 and 5, a mandrel 17 is arranged at the rear of the screw 5, an electromagnet 18 is fixed at the rear of the mandrel 17, and a sliding seat 19 capable of sliding back and forth and pushing the screw 5 to move is sleeved on the mandrel 17. A locking structure capable of locking the sliding seat 19 on the mandrel 17 is arranged between the sliding seat 19 and the mandrel 17, an unlocking piece 20 is arranged between the electromagnet 18 and the locking structure, when the electromagnet 18 is powered off, the unlocking piece 20 can act on the locking structure to unlock the sliding seat 19 on the mandrel 17, and when the electromagnet 18 is powered on, the unlocking piece 20 is attracted on the electromagnet 18 and releases the locking structure. A parking spring 21 is connected to the slide base 19, which is capable of driving the slide base 19 to slide forward after the slide base 19 is unlocked from the spindle 17. The installation shell 8 is provided with a cylindrical installation hole positioned behind the screw rod 5, the sliding seat 19, the mandrel 17, the electromagnet 18 and the unlocking piece 20 are all positioned in the installation hole, and the mandrel 17 and the electromagnet 18 are both fixed on the installation shell 8.

The locking structure comprises a lock ring 22 sleeved on a sliding seat 19, a locking spring 23 capable of driving the lock ring 22 to slide backwards is connected between the lock ring 22 and the sliding seat 19, and an unlocking piece 20 can abut against the lock ring 22 and push the lock ring 22 to slide forwards after the electromagnet 18 is powered off. The outer side surface of the mandrel 17 is provided with a locking groove 17a, the side wall of the sliding seat 19 is penetrated with a through hole 19a corresponding to the locking groove 17a, the inner side surface of the locking ring 22 is provided with a avoiding groove 22a, and the through hole 19a is provided with a locking ball 24. The locking groove 17a is annular, and the bottom surface of the locking groove 17a is arc-shaped to accommodate the locking ball 24. The perforations 19a are provided with a plurality of locking balls 24 which are uniformly distributed along the circumferential direction, and the locking balls are arranged in one-to-one correspondence with the perforations 19 a. The escape groove 22a is annular, and the front side surface of the escape groove 22a is inclined forward. When the sliding seat 19 slides until the through hole 19a is opposite to the locking groove 17a and the lock ring 22 slides until the avoiding groove 22a is positioned behind the through hole 19a, the inner side part of the locking ball 24 is embedded into the locking groove 17a and the outer side part of the locking ball 24 is abutted against the inner side surface of the front end of the lock ring 22, and when the lock ring 22 slides forwards until the avoiding groove 22a is opposite to the through hole 19a, the inner side part of the locking ball 24 can be separated from the locking groove 17a and the outer side part of the locking ball 24 is embedded into the avoiding groove 22 a.

The outer side surface of the front end of the sliding seat 19 is provided with a convex annular front propping ring 19b, the outer side surface of the rear end of the mandrel 17 is provided with a convex annular rear propping ring 17b, the sliding seat 19 is sleeved with a parking spring 21, and two ends of the parking spring 21 respectively prop against the front propping ring 19b and the rear propping ring 17 b. The outer side of the front abutment ring 19b abuts against the wall of the mounting hole, and the outer side of the rear abutment ring 17b abuts against the wall of the mounting hole. The locking spring 23 is sleeved on the sliding seat 19 and is positioned on the inner side of the parking spring 21, and two ends of the locking spring 23 respectively abut against the front abutting ring 19b and the front end of the locking ring 22. The outside of the locking spring 23 is sleeved with a protective sleeve 25, and the protective sleeve 25 separates the locking spring 23 from the parking spring 21. The protective sleeve 25 is fixed on the sliding seat 19, the front end of the protective sleeve 25 is inwards bent to form a fixing edge, the fixing edge is positioned between the front abutting ring 19b and the locking ring 22, the fixing edge abuts against the rear end face of the front abutting ring 19b, and the front end of the locking spring 23 abuts against the fixing edge. The lock ring 22 has a recess at the outer edge of the front end face, and the rear end of the lock spring 23 is fitted into the recess and abuts against the bottom face of the recess.

An end cap 26 is fixed to the rear end of the mounting case 8. The electromagnet 18 includes a housing and an electromagnetic coil assembly fixed in the housing, the rear end face of the electromagnet 18 housing being abutted against and fixed to the front end face of the end cap 26, the outer side face of the electromagnet 18 housing being abutted against the hole wall face of the mounting hole, the front end face of the electromagnet 18 housing being abutted against the rear end face of the rear abutment ring 17 b. The unlocking member 20 includes an engaging plate 20a that can engage with the electromagnet 18, and an assembly groove is provided in the front end surface of the electromagnet 18 housing, and the engaging plate 20a is positioned in the assembly groove and can slide back and forth. The front end surface of the engaging plate 20a is provided with a plurality of protruding ejector rods 20b, the ejector rods 20b are uniformly arranged along the circumferential direction, and the ejector rods 20b penetrate through the rear abutting ring 17b and are opposite to the rear end surface of the locking ring 22. A fixing bolt 27 is fixedly connected between the shell of the electromagnet 18 and the mandrel 17, and the suction disc 20a is sleeved on the fixing bolt 27. A pushing spring 28 is connected between the housing of the electromagnet 18 and the unlocking member 20 in an abutting manner, and when the electromagnet 18 is powered off, the pushing spring 28 can drive the unlocking member 20 to move forward and act on the locking structure. The housing of the electromagnet 18 is provided with a mounting groove into which the push spring 28 is inserted, and the front end of the push spring 28 protrudes out of the mounting groove and abuts against the attraction disc 20 a.

As shown in fig. 1, 3 and 5, the screw thread spiral direction of the screw 5 is the same as the screw thread spiral direction of the compensation screw 11, and the leads of the screw 5 and the compensation screw 11 are the same, for example, the screw 5 and the compensation screw 11 are both right-handed and are both 6mm leads. The rear end of the compensation screw 11 extends out of the screw 5 and is provided with a clutch ring 11a, a clamping ring 29 is fixed in front of the clutch ring 11a on the rear end of the compensation screw 11, the clutch sleeve 12 is sleeved outside the clutch ring 11a and can move back and forth, a clutch spring 30 is sleeved on the rear end of the compensation screw 11, the clutch spring 30 can be a disc spring or a pressure spring, and two ends of the clutch spring 30 respectively lean against the clamping ring 29 and the clutch sleeve 12. The clutch sleeve 12 has a collar 12a on its inner side, the collar 12a is located between the collar 29 and the clutch ring 11a, the rear end face of the collar 12a can abut against the front end face of the clutch ring 11a under the action of the clutch spring 30 and form an engaged state, when the rear end face of the collar 12a abuts against the front end face of the clutch ring 11a, the rear end of the clutch sleeve 12 protrudes out of the rear end face of the compensation screw 11 and abuts against the slide seat 19, and at this time, the rear end face of the compensation screw 11 is opposite to the front end face of the slide seat 19 with a gap. The rear end of the extension sleeve portion 10a fits over the clutch sleeve 12 and forms a circumferentially fixed and axially sliding fit with the clutch sleeve 12, such as a spline or flat square configuration as shown in fig. 4. An end face bearing 31 is further arranged between the clutch spring 30 and the clutch sleeve 12, a gasket is arranged between the end face bearing 31 and the clutch spring 30, and the rear end face of the clutch sleeve 12 is an arc-shaped face protruding backwards. The rear end face of the convex ring 12a is a conical surface, and the front end face of the clutch ring 11a is a spherical conical surface.

During normal running, the clutch spring 30 acts on the clutch sleeve 12 to tightly abut and hold the rear end face of the convex ring 12a and the front end face of the clutch ring 11a in an engaged state, and the rear end face of the clutch sleeve 12 abuts against the front end face of the slide seat 19. When the service braking is carried out and released, the brake motor 7 drives the driving gear 9 to rotate, the driving gear 9 drives the driven gear 10 and the nut 6 to rotate, the driven gear 10 drives the clutch sleeve 12 to rotate through the extension sleeve part 10a, at the moment, the clutch spring 30 acts on the clutch sleeve 12 to enable the rear end face of the convex ring 12a and the front end face of the clutch ring 11a to tightly abut against each other to keep an engaged state, the clutch sleeve 12 rotates to drive the compensation screw 11 to synchronously rotate, at the moment, the rear end face of the clutch sleeve 12 abuts against the sliding seat 19 but does not enable the sliding seat 19 to rotate, and a gap state is kept between the rear end face of the compensation screw 11 and the front end face of the sliding seat 19. When the vehicle is powered off or parking braking is needed, as the rear end of the clutch sleeve 12 protrudes out of the rear end face of the compensation screw 11, the sliding seat 19 slides forwards and firstly abuts against the rear end of the clutch sleeve 12 to enable the clutch sleeve 12 to slide forwards, at the moment, the convex ring 12a is separated from the clutch ring 11a, and then the sliding seat 19 abuts against the rear end face of the compensation screw 11 to continuously push the compensation screw 11 and the screw 5 to move forwards. When the parking brake or the emergency power-off brake is reset, the brake motor 7 reversely drives the driven gear 10 and the nut 6 to reversely rotate, at the moment, the sliding seat 19 still abuts against the rear end face of the clutch sleeve 12 and the rear end face of the compensating screw 11, the convex ring 12a and the clutch ring 11a are kept in a separated state, the compensating screw 11 does not rotate along with the driven gear 10, and the compensating screw 11 and the screw 5 are kept fixed and synchronously move backwards. Until the sliding seat 19 is locked on the mandrel 17, the parking brake or the emergency power-off brake is reset, at this time, the brake motor 7 stops working, the rear end of the clutch sleeve 12 is kept against the sliding seat 19 under the action of the clutch spring 30, and the compensation screw 11 moves forward to enable the convex ring 12a and the clutch ring 11a to be against again and restore the joint state. After that, the brake motor 7 is rotated forward, and normal service braking can be performed.

The load cell 15 is used to measure the abrupt change in axial force experienced by the driven gear 10 and the nut 6. When the service braking is needed, the brake motor 7 is electrified to rotate positively, when the brake motor 7 rotates for N2 circles, the brake pad 2 contacts with the brake disc to generate braking force, namely, when the braking gap between the brake pad 2 and the brake disc is disappeared, the stress condition of the load cell 15 suddenly changes to generate a braking start signal, the braking start signal is transmitted to an EMB control unit of the vehicle, the EMB control unit records the position of the rotating shaft of the brake motor 7 at the moment and determines a braking zero position, the braking zero position is taken as a starting point, and the brake motor 7 continues to rotate for N1 circles to achieve the needed braking force. When the braking force is released after the service braking is finished, the braking motor 7 is operated and reversely rotated, the motor is stopped after being reversely rotated by N1+ N0 turns, the braking is finished, and the braking gap between the brake pad 2 and the brake disc is delta=n 1+ N0-N1=n 0, wherein N0 is an initial braking gap, and the braking motor 7 is reversely rotated by delta N turns less than the forward rotation, and delta n=n 2-N0 is used for supplementing the abrasion loss delta X. With this arrangement, the brake automatically removes the brake clearance caused by wear between the brake pad 2 and the brake disc, and the initial brake clearance is kept constant.

As shown in fig. 6, friction wear occurs in the brake pad 2 during braking, and the wear amount is Δx. In order to keep the initial braking clearance constant, the braking motor 7 rotates by a small amount of delta N to enable the compensation screw 11 to extend out by delta X more than the screw 5 when rotating reversely, namely the axial total length of the compensation screw 11 and the screw 5 is increased by delta X after the braking of the running is finished, so that the clutch sleeve 12 can be kept against the sliding seat 19 under the condition that the initial braking clearance is kept constant, namely the distance between the rear end surface of the compensation screw 11 and the sliding seat 19 is kept constant, and the forward extending amount of the screw 5 is kept constant during the parking braking, so that the braking force of the parking braking is kept constant, the stability of the parking braking is ensured, and the use safety of the brake is improved.

As shown in fig. 1, 2 and 5, when the vehicle is electrified and normally used, when the service brake is needed, the brake motor 7 rotates positively to drive the screw nut 6 to rotate so as to drive the screw 5 to move forwards for braking, when the service brake is needed to be released, the brake motor 7 rotates reversely to drive the screw 5 to move backwards for resetting, the electromagnet 18 keeps the electrified state, the unlocking piece 20 can be attracted on the electromagnet 18, the ejector rod 20b of the unlocking piece 20 is released from the lock ring 22, the locking structure locks the sliding seat 19 on the mandrel 17, the sliding seat 19 can not prevent the screw 5 from moving forwards, namely the number of rotation circles of the screw 5 driven by the brake motor 7 to move forwards is not limited, meanwhile, the parking spring 21 compresses and stores elastic potential energy for driving the sliding seat 19 to slide forwards, and the pushing spring 28 compresses and stores elastic potential energy for driving the unlocking piece 20 to slide forwards.

When the vehicle is powered off or the parking brake is needed, the electromagnet 18 is powered off, the unlocking piece 20 slides forwards under the action of the pushing spring 28, the ejector rod 20b abuts against the lock ring 22 to enable the avoiding groove 22a of the lock ring 22 to align with the locking ball 24, the locking of the sliding seat 19 on the mandrel 17 is released, the parking spring 21 pushes the sliding seat 19 to slide forwards, the inner side part of the locking ball 24 is separated from the locking groove 17a of the mandrel 17, the sliding seat 19 abuts against the rear end face of the clutch sleeve 12 first to enable the clutch sleeve 12 to slide forwards, the convex ring 12a is separated from the clutch ring 11a, and then the sliding seat 19 abuts against the rear end face of the compensation screw 11, so that the screw 5 is driven to move forwards, and the brake pad 2 is braked.

When the vehicle is powered back or the parking brake needs to be released, the electromagnet 18 is electrified, the unlocking piece 20 slides backwards and is attracted to the electromagnet 18, the ejector rod 20b moves backwards and leaves the lock ring 22, then the braking motor 7 rotates reversely to drive the screw rod 5 to move backwards, the rear end face of the clutch sleeve 12 and the rear end face of the compensation screw rod 11 abut against the sliding seat 19 to drive the sliding seat 19 to move backwards to reset, meanwhile, the locking spring 23 acts on the lock ring 22 to enable the lock ring 22 to slide backwards, when the sliding seat 19 slides until the through hole 19a is in alignment with the locking groove 17a, the lock ring 22 acts on the outer side face of the locking ball 24 to enable the inner side part of the locking ball 24 to be embedded into the locking groove 17a to form locking, and thus the locking structure locks the sliding seat 19 on the mandrel 17 again. After the brake motor 7 stops working, the rear end face of the clutch sleeve 12 is kept to be abutted against the sliding seat 19 under the action of the clutch spring 30, the compensation screw 11 and the screw 5 slightly slide forward to enable the clutch ring 11a to be abutted against the convex ring 12a again, and a gap is formed between the rear end face of the compensation screw 11 and the front end face of the sliding seat 19, so that running brake is not affected.

After the braking mechanism is used, parking braking and power-off emergency braking can be realized through mechanical braking, the rotation number of the braking motor 7 during service braking cannot be influenced by the sliding seat 19, namely, the braking force during running braking cannot be limited by the sliding seat 19, and the safety of service braking is improved. Therefore, the brake mechanism can realize service braking and parking braking, and simultaneously improves the service safety. Under the condition of ensuring the constant initial braking clearance, the braking force of the parking brake is kept constant, the stability of the parking brake is ensured, and the use safety of the brake is improved. In addition, a manual adjusting piece is further arranged on the rear end of the brake motor 7, and the manual adjusting piece is rotated anticlockwise to drive the brake motor 7 to rotate reversely, so that the parking brake is manually released or the power-off emergency brake is realized.

Example two

The lock structure of this embodiment is different from that of the first embodiment, and the other structures are the same as those of the first embodiment. The locking structure comprises a lock sleeve sleeved and fixed on the sliding seat 19, a locking hole is formed in the outer side face of the mandrel 17, a sliding hole penetrates through the side wall of the sliding seat 19, a positioning hole is formed in the inner side face of the lock sleeve, the positioning hole is opposite to the sliding hole, and the sliding seat 19 can slide until the sliding hole is opposite to the locking hole. The locking pin is penetrated in the sliding hole, the locking pin is in spline sliding fit with the sliding hole, the inner end of the locking pin can be inserted into the locking hole, and the inner end face of the locking pin is an inclined face. The outer end of the locking pin is connected with a locking spring, the locking spring is installed in the positioning hole, and when the sliding seat 19 slides to enable the sliding hole to be opposite to the locking hole, the locking spring can drive the locking pin to enable the inner end of the locking pin to be inserted into the locking hole. The ejector pin 20b of the unlocking member 20 is inserted into the spindle 17, and when the electromagnet 18 is deenergized, the front end of the ejector pin 20b can abut against the inclined surface of the inner end of the locking pin and push the locking pin to slide outwards so that the inner end of the locking pin is separated from the locking hole.

When the vehicle is electrified and normally used, the sliding hole of the sliding seat 19 is aligned with the locking hole, the unlocking piece 20 is attracted to the electromagnet 18, the ejector rod 20b is far away from the locking pin, and the inner end of the locking pin is inserted into the locking hole of the mandrel 17 under the action of the locking spring, so that the sliding seat 19 is locked on the mandrel 17. When the power is lost or the parking brake is performed, the ferromagnetic iron is powered off, the unlocking piece 20 moves forwards, the ejector rod 20b abuts against the inclined surface at the inner end of the positioning pin, the inner end of the positioning pin is separated from the locking hole of the mandrel 17, the locking of the sliding seat 19 on the mandrel 17 is released, and the parking spring 21 acts on the sliding seat 19 to enable the sliding seat 19 to slide forwards to perform the parking brake or the power-off brake. When the vehicle is powered back or the parking brake needs to be released, the electromagnet 18 is powered on, the unlocking piece 20 is attracted to the electromagnet 18 to enable the ejector rod 20b to move backwards and away from the locking pin, then the braking motor 7 rotates reversely to drive the screw rod 5 to move backwards, the rear end of the screw rod 5 abuts against the sliding seat 19 to drive the sliding seat 19 to move backwards to reset, when the sliding seat 19 slides until the sliding hole is opposite to the locking hole, the inner end of the locking pin is reinserted into the locking hole of the mandrel 17 under the action of the locking spring, and therefore the sliding seat 19 is locked on the mandrel 17 again. Therefore, the parking brake and the resetting of the parking brake can be realized, the driving brake cannot be influenced by the realization of the parking brake, and the driving safety is ensured.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A brake mechanism of a brake, comprising a lead screw (5) and a nut (6) that cooperate with each other and a brake motor (7) that can drive the nut (6) to rotate so that the lead screw (5) moves forward and backward, characterized in that it also includes a fixed core shaft (17), the core shaft (17) is located behind the lead screw (5), an electromagnet (18) is fixed behind the core shaft (17), a sliding seat (19) that can slide back and forth and can push the lead screw (5) to move is mounted on the core shaft (17), and a device that can enable the sliding seat (19) to move is provided between the sliding seat (19) and the core shaft (17). A locking structure is locked on a spindle (17); an unlocking member (20) is arranged between the electromagnet (18) and the locking structure; when the electromagnet (18) is powered off, the unlocking member (20) can act on the locking structure to release the lock of the sliding seat (19) on the spindle (17); when the electromagnet (18) is powered on, the unlocking member (20) is attracted to the electromagnet (18) and releases the locking structure; and a parking spring (21) is connected to the sliding seat (19) and can drive the sliding seat (19) to slide forward after the sliding seat (19) and the spindle (17) are unlocked.

2. The brake mechanism of the brake according to claim 1 is characterized in that the locking structure includes a locking ring (22) mounted on the sliding seat (19), a locking spring (23) capable of driving the locking ring (22) to slide backward is connected between the locking ring (22) and the sliding seat (19), the unlocking member (20) can abut against the locking ring (22) and push the locking ring (22) to slide forward after the electromagnet (18) is powered off, a locking groove (17a) is provided on the outer side surface of the core shaft (17), a through hole (19a) corresponding to the locking groove (17a) is penetrated on the side wall of the sliding seat (19), and a avoiding The locking ball (24) is arranged in the through hole (19a); when the sliding seat (19) slides to the through hole (19a) facing the locking groove (17a) and the locking ring (22) slides to the avoidance groove (22a) behind the through hole (19a), the inner side of the locking ball (24) is embedded in the locking groove (17a) and the outer side of the locking ball (24) abuts against the inner side of the locking ring (22); when the locking ring (22) slides forward to the avoidance groove (22a) facing the through hole (19a), the inner side of the locking ball (24) can be separated from the locking groove (17a) and the outer side of the locking ball (24) is embedded in the avoidance groove (22a).

3. The braking mechanism of the brake according to claim 2 is characterized in that the locking spring (23) is mounted on the sliding seat (19), the outer side of the locking spring (23) is mounted with a protective cover (25) fixed on the sliding seat (19), and the parking spring (21) is mounted on the outer side of the protective cover (25).

4. The brake mechanism of the brake according to claim 3 is characterized in that the front end of the sliding seat (19) is provided with a front abutment ring (19b), the rear end of the core shaft (17) is provided with a rear abutment ring (17b), and the two ends of the parking spring (21) are respectively abutted against the front abutment ring (19b) and the rear abutment ring (17b).

5. The braking mechanism of the brake according to claim 4 is characterized in that the unlocking member (20) includes an attraction disk (20a) that can be attracted to the electromagnet (18), and the front end face of the attraction disk (20a) has a protruding push rod (20b), and the push rod (20b) passes through the rear abutment ring (17b) and is opposite to the rear end face of the locking ring (22).

6. The braking mechanism of the brake according to claim 1 is characterized in that a push spring (28) is connected between the housing of the electromagnet (18) and the unlocking member (20), and when the electromagnet (18) loses power, the push spring (28) can drive the unlocking member (20) to move forward and act on the locking structure.

7. The brake mechanism of the brake according to any one of claims 1 to 6, characterized in that the rear end of the lead screw (5) is threadedly connected with a compensating screw (11), the rear end of the compensating screw (11) extends out of the lead screw (5) and has a clutch ring (11a), a retaining ring (29) is fixed on the rear end of the compensating screw (11) in front of the clutch ring (11a), a clutch sleeve (12) that can slide back and forth is mounted on the outer surface of the clutch ring (11a), a clutch spring (30) is connected between the retaining ring (29) and the clutch sleeve (12), and a convex ring (12a) is provided on the inner side surface of the clutch sleeve (12), the convex ring (12a) is located between the retaining ring (29) and the clutch ring (11a), and under the action of the clutch spring (30), the convex ring (12a) can abut against the clutch ring (11a) and form a contact. In the engaged state, when the convex ring (12a) abuts against the clutch ring (11a), the rear end of the clutch sleeve (12) protrudes from the rear end surface of the compensation screw (11) and abuts against the sliding seat (19); a driving gear (9) and a driven gear (10) that mesh with each other are arranged between the brake motor (7) and the nut (6); the driven gear (10) is sleeved on the outer side of the nut (6) and is circumferentially fixed and axially limited with the nut (6); the rear end of the driven gear (10) extends backward to form an extension sleeve (10a); the extension sleeve (10a) is sleeved outside the clutch sleeve (12) and forms a circumferentially fixed and axially sliding fit with the clutch sleeve (12); the screw thread of the lead screw (5) has the same spiral direction as the screw thread of the compensation screw (11), and the lead of the lead screw (5) is the same as the lead of the compensation screw (11).

8. The braking mechanism of the brake according to claim 7 is characterized in that, under the action of the clutch spring (30), the front end face of the clutch ring (11a) abuts against the rear end face of the convex ring (12a), the front end face of the clutch ring (11a) is a spherical cone surface, and the rear end face of the convex ring (12a) is a conical surface, and an end face bearing (31) is also arranged between the clutch spring (30) and the clutch sleeve (12), and the rear end face of the clutch sleeve (12) is an arc-shaped surface protruding backwards.

9. The brake mechanism of the brake according to claim 7, characterized in that a force sensor (15) for measuring a sudden change in the axial force of the driven gear (10) is provided on the driven gear (10).

10. A brake, comprising a caliper body (1) and a brake pad (2), characterized in that it also comprises a brake mechanism as claimed in any one of claims 1 to 9, wherein a push plate (4) abutting against the brake pad (2) is fixed to the front end of the lead screw (5).