CN103814231B - Disk brake - Google Patents

Abstract

The present invention relates to a disc brake. The disc brake comprises: a first supporting member, one end of which is inserted into insertion holes respectively provided at the ends of a pair of brake pads, and the other end is inserted along the axial direction of the brake disc. Slidably arranged in the first fitting hole provided on the brake caliper; the bracket, on which the first support member is provided and fixed on the vehicle body; the second support member, one end side of which is fixed to the vehicle body The other end side is slidably disposed in a second fitting hole provided on the brake caliper. The first support member is configured to contact the insertion hole of the brake pad to receive braking torque during braking, and the gap between the first support member and the first fitting hole is larger than that between the second support member and the second fitting hole. The gap is small.

Description

Disc brakes

technical field

The present invention relates to disc brakes for braking vehicles.

This application claims priority based on Japanese Patent Application No. 2011-190014 for which it applied in Japan on August 31, 2011, and uses the content here.

Background technique

In a disc brake used for braking a vehicle, there has been proposed a structure in which a caliper is slidably supported by screwing a slide bolt fixed to a vehicle body (for example, refer to Patent Document 1).

prior art literature

patent documents

Patent Document 1: (Japan) Utility Application Publication No. 59-191434

Contents of the invention

The technical problem to be solved by the invention

The work of assembling the above-mentioned disc brakes to the vehicle body is complicated and the productivity is low.

An object of the present invention is to provide a disc brake capable of improving productivity.

Technical solutions for technical problems

In order to achieve the above object, the disc brake according to the first aspect of the present invention includes: a first support member, one end side of which is inserted into the insertion holes respectively provided at the ends of the pair of brake pads, and the other end side is inserted along the The axial direction of the moving disc can be slidably arranged in the first fitting hole provided on the brake caliper; the bracket is provided with the first support member and fixed on the vehicle body; the second support One end of the component is fixed to the vehicle body, and the other end is slidably arranged in a second fitting hole provided in the brake caliper along the axial direction of the brake disc. The first support member contacts the insertion holes of the pair of brake pads during braking to receive a braking torque, and the clearance ratio between the first support member and the first fitting hole is set. The gap between the second supporting member and the second fitting hole is small.

In the disc brake according to the second aspect of the present invention, on the basis of the first aspect, the bracket is fixed on the vehicle body by at least one mounting thread member.

In the disc brake according to the third aspect of the present invention, in the first aspect or the second aspect, the bracket may be fixed to the vehicle body at the one end side of the second support member. .

In the disc brake according to the fourth aspect of the present invention, on the basis of any one of the first aspect to the third aspect, the first supporting member is connected to the one on the side where the brake disc is screwed in during braking. The braking torque is received by being in contact with the insertion hole of the brake pad.

In the disc brake according to a fifth aspect of the present invention, in any one of the first to fourth aspects, an elastic member is installed between the second supporting member and the second fitting hole. , the gap is formed to contain the elastic member.

The effect of the invention

According to the above-mentioned means, productivity can be improved.

Description of drawings

FIG. 1 is a front view showing a disc brake according to an embodiment of the present invention.

Fig. 2 is a view taken along the line A in Fig. 1 showing a disc brake according to an embodiment of the present invention.

Fig. 3 is a view taken along the direction B in Fig. 1 showing a disc brake according to an embodiment of the present invention.

Fig. 4 is a view taken along the arrow C in Fig. 1 showing a disc brake according to an embodiment of the present invention.

Fig. 5 is a rear view showing a disc brake according to an embodiment of the present invention.

Fig. 6 is a view taken along the direction D in Fig. 1 showing a disc brake according to an embodiment of the present invention.

Fig. 7 is a partial sectional view of a disc brake according to an embodiment of the present invention.

Fig. 8 is a front view showing a bracket of a disc brake according to an embodiment of the present invention.

FIG. 9 is a view from the arrow E in FIG. 8 showing the bracket of the disc brake according to the embodiment of the present invention.

Fig. 10 is a view taken along the direction F in Fig. 8 showing the bracket of the disc brake according to one embodiment of the present invention.

Fig. 11 is a view taken along the line G in Fig. 8 showing the bracket of the disc brake according to one embodiment of the present invention.

Fig. 12 is a rear view showing a bracket of a disc brake according to an embodiment of the present invention.

Fig. 13 is a view taken along the H direction in Fig. 8 showing the bracket of the disc brake according to the embodiment of the present invention.

detailed description

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

The disc brake of this embodiment is used for a vehicle, specifically, a disc brake for a motorcycle. The disc brake 1 has a bracket 3 fixed on the front fork 2 of the vehicle as shown in Figures 1, 2, 4 to 6, a brake disc 4 as shown in Figures 1 to 6 and a The brake disc 4 is provided with a brake caliper 5 . As shown in FIGS. 2 to 4 , the disc brake 1 has: a pair of brake pads 7 , 8 ; a mounting member (second support member) 11 including a mounting bolt 9 and a sleeve 10 ; a cover (elastic member) 12 . As shown in FIGS. 1 and 2 , the disc brake 1 has mounting bolts (mounting screw members) 13 and a cover 14 .

It should be noted that the arrow R shown in Fig. 1, Fig. 2, Fig. 4 and Fig. 5 indicates the direction of rotation of the brake disc 4 when the vehicle advances, and the entrance side in the direction of rotation R is used as the side where the brake disc is screwed in, Take the outlet side as the side where the brake disc spins out for illustration. In addition, the axial direction of the brake disc 4 is the axial direction of the brake disc, the radial direction of the brake disc 4 is the radial direction of the brake disc, and the rotation direction of the brake disc 4 is the rotation direction of the brake disc or the direction of rotation of the brake disc. Circumferential. In addition, front, rear, left, and right when the vehicle travels forward in a straight forward state are referred to as front, rear, left, and right.

Only a part of the front fork 2 shown in FIGS. 1 to 6 constitutes a part of the vehicle body and rotatably supports an unillustrated wheel of the vehicle at its lower end. The front fork 2 has a cylindrical pipe 20, and the pipe 20 is arranged such that the vertical direction shown in FIGS. 1 and 5 is defined as the vertical direction, and the front and rear directions shown in FIGS. direction. Therefore, the pipe 20 is installed on the vehicle in a posture inclined rearward and upward.

As shown in FIG. 1 , in the front fork 2 , a plate-shaped caliper bracket 21 extending rearward and downward from the rear portion of the pipe 20 is integrally formed with the pipe 20 . In this caliper bracket 21 , the plate thickness direction is defined as the left-right direction. In this caliper bracket 21, a mounting hole 22 with a constant inner diameter is formed penetrating in the plate thickness direction at the base end portion of the caliper bracket 21 near the pipe 20 side. A mounting hole 23 with a constant inner diameter is formed in the opposite end portion of the pipe 20 in the plate thickness direction.

Around the mounting hole 22 of the caliper bracket 21 is a mounting portion 24 for mounting the bracket 3 , and around the mounting hole 23 of the caliper bracket 21 is a mounting portion 25 for mounting the bracket 3 . In other words, the brake caliper bracket 21 extends along the rotation direction of the brake disc from the side where the brake disc spins out to the side where the brake disc spins in, and the end of the brake disc on the side where the brake disc spins out is formed with a mounting portion 24 and a mounting hole 22. A mounting portion 25 and a mounting hole 23 are formed at the end of the rotating disk on the screw-in side. The caliper bracket 21 including the mounting parts 24, 25 is a non-rotating part of the vehicle that does not rotate with the wheels.

The brake disc 4 is disc-shaped. The brake disc 4 is connected to a wheel so as to rotate integrally with a wheel (not shown) which is a braking target of the disc brake 1 , with the central axis extending in the left-right direction.

As shown in FIGS. 8 to 13 , the bracket 3 has a mounting frame 28 and a kingpin (first support member) 29 integrally fixed to the mounting frame 28 .

The mounting frame 28 is composed of a plate-shaped member, and includes a board portion 31 long in one direction and an extension plate portion 32 extending from one end of the board portion 31 in the longitudinal direction at an obtuse angle relative to the board portion 31 . A threaded hole 33 penetrating in the plate thickness direction is formed at an end of the base plate portion 31 opposite to the extended plate portion 32 , and a threaded hole 34 penetrating in the plate thickness direction is formed at an end portion on the side of the extended plate portion 32 . Around the threaded hole 33 is an attaching portion 35 to be attached to the vehicle body, and around the threaded hole 34 is an attaching portion 36 to be attached to the vehicle body. In addition, a master pin attachment hole 38 as shown in FIG. 9 is formed penetratingly in the thickness direction of the extended plate portion 32 at the end portion opposite to the base plate portion 31 .

The outer shape of the mounting bracket 28 is punched out of a metal plate by press forming, for example, and the punched out plate is formed with threaded holes 33 , 34 and a kingpin mounting hole 38 by cutting or the like. The mounting frame 28 has not been bent with respect to the above-mentioned plate material, and has no protrusion in the plate thickness direction. In addition, the thickness of the mounting frame 28 is substantially constant.

The main pin 29 has successively from one end in the axial direction: a torque receiving shaft portion 41 having a certain diameter with a circular section, a fixed shaft portion 42 having a larger diameter than the torque receiving shaft portion 41, and a larger fixed shaft portion 42 having a larger diameter than the fixed shaft portion 42. The intermediate shaft portion 43 , the flange portion 44 having a larger diameter than the intermediate shaft portion 43 , and the guide shaft portion 45 having a smaller diameter than the torque receiving shaft portion 41 . The main pin 29 is made of metal, and only one is provided on one bracket 3 .

The main pin 29 is fitted and fixed to the main pin installation hole 38 of the mounting bracket 28 on the fixed shaft portion 42 thereof. The main pin 29 is perpendicular to the mounting frame 28 in a state of being mounted on the mounting frame 28 , and extends in the plate thickness direction of the mounting frame 28 . The master pin 29 has a torque receiving shaft portion 41 protruding from one side of the mounting frame 28 in the thickness direction, an intermediate shaft portion 43 protruding from the other side of the mounting frame 28 in the thickness direction, a flange portion 44 and a guide shaft portion 45 .

As shown in FIG. 2 , in a state where the mounting frame 28 is arranged on one surface side of the brake disc 4 , that is, the outer side (the side opposite to the wheel) and the inner side (the wheel side) of the caliper bracket 21 , the mounting frame 28 , The bracket 3 is fixed on the brake caliper bracket 21 by mounting bolts 9,13. At this time, the mounting frame 28 is fixed so that the extension plate portion 32 is disposed on the brake disc screw-in side, and the base plate portion 31 is in a posture extending from the extension plate portion 32 to the brake disc screw-out side.

Furthermore, as shown in FIG. 5 , the mounting bolt 9 is inserted into the base end side of the caliper bracket 21 , that is, the mounting hole 22 on the disc unscrewing side, and is screwed into the threaded hole 33 on the disc unscrewing side of the mounting frame 28 . The mounting bolts 13 are inserted into the mounting holes 23 on the front end side of the brake caliper bracket 21 , that is, the mounting holes 23 on the brake disc screw-in side, and are screwed into the threaded holes 34 on the brake disc screw-in side of the mounting frame 28 . In this way, the bracket 3 is mounted on the caliper bracket 21 .

The bracket 3 installed on the brake caliper bracket 21 is located in the base plate portion 31 of the mounting frame 28 extending in the direction of rotation of the brake disc, and the extension plate portion 32 extends from the end portion of the base plate portion 31 on the brake disc screw-in side to the brake disc. The state in which the disk extends radially outward. Furthermore, the front end portion of the extension plate portion 32 on the side where the brake disc is screwed in of the mounting frame 28 is provided with a master pin 29 extending to both sides along the brake disc axial direction.

As shown in FIG. 4 , the master pin 29 protrudes from the mounting bracket 28 toward the brake disc 4 (inwardly) such that the torque receiving shaft portion 41 protrudes beyond the brake disc 4 on the outer side in the disc radial direction. The intermediate shaft portion 43 , the flange portion 44 , and the guide shaft portion 45 protrude from the mounting bracket 28 to the side (outer side) opposite to the brake disc 4 .

The mounting bolt 13 disposed on the brake disc screw-in side is a metal bolt, and has a head portion 48 and a shaft portion 49 having a smaller diameter than the head portion 48 as shown in FIG. 6 . The shaft portion 49 has a threaded shaft portion 50 on the opposite side from the head portion 48 and an externally threaded outer peripheral portion, and a fitting shaft portion 51 having a fixed diameter between the threaded shaft portion 50 and the head portion 48 .

In the mounting hole 23 of the caliper bracket 21, the shaft portion 49 is inserted from the side opposite to the brake disc 4, the fitting shaft portion 51 is fitted into the mounting hole 23, and a bolt is attached to the threaded shaft portion 50. 13 is threadedly combined with the threaded hole 34 of the bracket 3. Thus, the head portion 48 and the mounting portion 36 around the screw hole 34 of the bracket 3 sandwich the mounting portion 25 around the mounting hole 23 of the caliper bracket 21 . In other words, the mounting bolt 13 fixes the mounting portion 36 of the bracket 3 to the mounting portion 25 of the brake caliper bracket 21 of the front fork 2 .

As shown in FIG. 7 , the mounting member 11 arranged on the side where the brake disc is unscrewed has a mounting bolt 9 and a sleeve 10 . The mounting bolt 9 is a metal bolt and has a head portion 54 and a shaft portion 55 having a smaller diameter than the head portion 54 . The shaft portion 55 has a threaded shaft portion 56 with external threads formed on the outer peripheral portion opposite to the head portion 54 , and a fitting shaft portion 57 having a constant diameter between the threaded shaft portion 56 and the head portion 54 .

The sleeve 10 is made of an inelastic member such as metal, and has a substantially cylindrical shape with an inner peripheral portion having a constant inner diameter. A pair of large diameter portions 60 , 60 , a pair of small diameter portions 61 , 61 , a pair of tapered portions 62 , 62 , and a sliding guide portion 63 are formed on the outer peripheral portion of the sleeve 10 .

A pair of large-diameter portions 60, 60 are formed at both axial ends of the sleeve 10 and have a certain diameter. The pair of small-diameter portions 61 , 61 are adjacent to the inner sides of the pair of large-diameter portions 60 in the axial direction of the sleeve 10 , and are smaller in diameter than these large-diameter portions 60 , 60 . The pair of tapered portions 62 , 62 are adjacent to the inner sides of the pair of small diameter portions 61 , 61 in the axial direction of the sleeve 10 . The pair of tapered portions 62 and 62 are continuous with the adjacent small-diameter portion 61 and have a tapered shape whose outer diameter increases as the distance from the small-diameter portion 61 increases. The slide guide portion 63 is formed between the pair of tapered portions 62 , 62 in the axial direction of the sleeve 10 . The slide guide portion 63 has a constant outer diameter continuous to the large diameter side of these tapered portions 62 , 62 .

The mounting member 11 is preliminarily brought into a state where, for example, the shaft portion 55 of the mounting bolt 9 is inserted into the sleeve 10 . In this state, in the mounting hole 22 of the caliper bracket 21, from the side opposite to the brake disc 4, insert the shaft portion 55 protruding from the sleeve 10 of the mounting bolt 9 so that the fitting shaft portion 57 The threaded shaft portion 56 fitted in the mounting hole 22 and at the front end is threadedly engaged with the threaded hole 33 of the bracket 3 .

Thus, the head portion 54 of the mounting bolt 9 and the sleeve 10 and the mounting portion 35 around the threaded hole 33 of the bracket 3 sandwich the mounting portion 24 around the mounting hole 22 of the caliper bracket 21 and are fixed to the caliper. on the bracket 21. In other words, the threaded shaft portion 56 on one end side of the mounting member 11 fixes the mounting portion 35 of the bracket 3 to the mounting portion 24 of the caliper bracket 21 of the front fork 2 . As shown in FIG. 5 , by fixing two mounting portions 35 and 36 to the caliper bracket 21 using mounting bolts 9 and 13 , rotation of the bracket 3 can be restricted.

As shown in FIG. 7 , the cover 12 has a cylindrical shape covering the outer peripheral side of the sleeve 10 . The cover 12 is made of rubber, and has a pair of engaging portions 67 , 67 , a pair of stretchable portions 68 , 68 , and a fitting slide portion 69 .

A pair of engaging portions 67, 67 are formed at both ends in the axial direction of the cover 12, and are formed in an annular shape with a constant inner diameter. These engaging portions 67 , 67 are fitted and fixed to the pair of small-diameter portions 61 , 61 of the sleeve 10 by a matching amount. The pair of expansion and contraction parts 68, 68 are respectively adjacent to the inner sides of the pair of engagement parts 67, 67 in the axial direction of the cover 12. As shown in FIG. A pair of expansion-contraction parts 68 and 68 are formed in the bellows shape which has small-diameter part and large-diameter part alternately, and is expandable and contractible.

The fitting slide portion 69 includes a cylindrical portion 70 formed in a cylindrical shape having a constant inner diameter and a constant outer diameter, and a pair of flanges extending radially outward from both ends of the cylindrical portion 70 . Section 71, 71. Outer peripheral edge portions of these flange portions 71 , 71 are respectively connected to expansion-contractable portions 68 adjacent in the axial direction of the cover 12 . The fitting slide portion 69 fits the slide guide portion 63 of the sleeve 10 inside, and can slide on the slide guide portion 63 in the axial direction when expanding and contracting the telescopic portions 68 , 68 .

The brake caliper 5 is supported on the sleeve 10 of the mounting member 11 via the cover 12 in such a manner that it can slide in the axial direction of the brake disc with respect to the bracket 3, and is supported on the main pin 29 as shown in FIGS. 2 and 4 . on the guide shaft part 45. The brake caliper 5 is a so-called floating caliper. As shown in FIG. 1 , the caliper 5 has a caliper body 75 , a piston 76 and a pad pin 77 .

The caliper body 75 is integrally formed by casting an aluminum alloy or the like, and then is formed by cutting. As shown in FIG. 7 , the caliper body 75 is slidably attached to the sleeve 10 of the mounting member 11 and the king pin 29 shown in FIG. 4 in a state of straddling the brake disc 4 . The brake caliper body 75 has: a hydraulic cylinder portion 80 disposed on the outside of the bracket 3; a bridging portion 81 extending from the radially outer side of the hydraulic cylinder portion 80 over the radially outer side of the brake disc 4 to the inner side. Extension: The claw portion 82 extends radially inward of the brake disc 4 from the inner end portion of the bridging portion 81 opposite to the hydraulic cylinder portion 80 .

As shown in FIG. 1 , a sliding portion 86 is protrudingly formed on the hydraulic cylinder portion 80 , and the sliding portion 86 is inclined so that the front end thereof is located on the disc unwinding side from the inner side in the disc radial direction. In addition, on the hydraulic cylinder portion 80, a sliding portion 87 is formed protrudingly along the disc circumferential direction, and the sliding portion 87 is formed so that the front end side of the brake disc screw-in side is positioned at the brake disc screw-in side from the brake disc radially outer side. . A fitting hole (second fitting hole) 88 having a constant inner diameter is formed on the sliding portion 86 as shown in FIG. 7 , and the fitting hole 88 penetrates through in the brake disc axial direction. In addition, the sliding portion 87 is formed with a fitting hole (first fitting hole) 89 with a certain inner diameter as shown in FIG. 2 and FIG. The midway position in the axial direction of the rotor.

As shown in FIG. 7 , the fitting slide portion 69 of the cover 12 is integrally fitted into the fitting hole 88 of the one sliding portion 86 of the caliper 5 . That is, the sliding portion 86 is sandwiched by the flange portions 71 , 71 on both sides from both sides in the disc axial direction in a state where the cylindrical portion 70 is fitted into the fitting hole 88 . The sliding guide portion 63 of the sleeve 10 is fitted into the fitting hole 88 of the sliding portion 86 via the fitting sliding portion 69 of the cover 12 . The sliding portion 86 is guided by the sliding guide portion 63 and can slide integrally with the fitting sliding portion 69 of the cover 12 in the brake disc axial direction. In other words, the sliding portion 86 of the caliper 5 is supported by the sliding guide portion 63 of the sleeve 10 so as to be slidable in the disc axial direction together with the fitting sliding portion 69 of the cover 12 . In other words, the mounting member 11 having one end fixed to the caliper bracket 21 is arranged so that the other end can slide in the fitting hole 88 provided in the caliper 5 in the disc axial direction. The surface of the sliding guide portion 63 of the sleeve 10 is coated with grease for smooth sliding of the fitting sliding portion 69 of the cover 12 .

As shown in FIGS. 2 and 4 , the guide shaft portion 45 of the master pin 29 is slidably fitted into the fitting hole 89 of the other sliding portion 87 of the caliper 5 . The sliding portion 87 is slidable in the brake disc axial direction under the guidance of the guide shaft portion 45 . In other words, the sliding portion 87 of the caliper 5 is supported by the guide shaft portion 45 of the master pin 29 so as to be slidable in the disc axial direction. In other words, the other end side of the master pin 29 extending from one end side of the brake caliper 5 to the brake disc 4 can fit in the fitting hole 89 provided on the brake caliper 5 along the brake disc axial direction. slide. The guide shaft portion 45 of the main pin 29 is coated with grease for smooth sliding of the sliding portion 87 .

The cover 14 is made of rubber, and has an engaging portion 92 that engages with the intermediate shaft portion 43 and the flange portion 44 of the kingpin 29; 87 snaps. The cover 14 always covers the guide shaft portion 45 protruding from the fitting hole 89 .

As described above, the caliper body 75 is composed of the mounting member 11 that fixes the bracket 3 to the front fork 2 and the bracket that is fixed to the front fork 2 so as to be slidable in the axial direction of the brake disc. King pin 29 supports on the 3.

Here, among the two parts that slidably support the brake caliper 5, one, that is, the guide shaft portion 45 of the master pin 29 shown in FIG. 2 and FIG. The gap C1 (primary side gap) is compared with the other gap C2 (secondary side gap) in the radial direction between the sliding guide portion 63 of the sleeve 10 of the mounting member 11 shown in FIG. 7 and the fitting hole 88 of the brake caliper 5 . Small. The cylindrical portion 70 of the cover 12 mounted between the fitting hole 88 and the slide guide portion 63 is included in the secondary clearance between the fitting hole 88 of the caliper 5 and the slide guide portion 63 of the sleeve 10 . That is to say, the sum of the gap between the cylindrical portion 70 and the sliding guide portion 63 and the gap between the cylindrical portion 70 and the fitting hole 88 and the amount of deformation constitutes a combination of the sliding guiding portion 63 and the fitting hole 88 . Side clearance C2.

In other words, the amount of movement of the brake caliper 5 in the direction perpendicular to the disc axis when it is supported by only one of the two parts that slidably support the brake caliper 5 , that is, the king pin 29 , is larger than when it is supported only by the other. When one side is supported by the sleeve 10 covered by the cover 12 , the amount of movement of the caliper 5 in the direction perpendicular to the disc axis is small. As a result, the bracket 3 mainly bears the force generated by the braking torque at the main pin 29 with a small gap with the brake caliper 5, and at the mounting part 11 with a large gap with the brake caliper 5. Installation of brake caliper 5 to front fork 2 and clearance absorption (ピッチ absorption).

As shown in FIG. 1 , a bottomed cylinder bore 97 is formed in the hydraulic cylinder portion 80 in the disc axial direction so as to open toward the claw portion 82 . A pipe connection hole 98 communicating with the cylinder bore 97 is formed on the outer side in the disc radial direction of the cylinder bore 97 along the disc radial direction, and the pipe connection hole 98 is connected to a brake pipe (not shown). In addition, an exhaust plug 99 communicating with the cylinder bore 97 for exhausting air is attached to a position closer to the disc unwinding side than the piping connection hole 98 of the hydraulic cylinder portion 80 . The piston 76 is slidably fitted into the cylinder bore 97 of the hydraulic cylinder unit 80 . When hydraulic fluid is introduced into the cylinder bore 97 through the pipe connection hole 98 , the piston 76 protrudes toward the brake disc 4 in the axial direction of the cylinder bore 97 .

As shown in FIG. 5 , grooves 100 for passing a cutting tool when machining the cylinder bore 97 shown in FIG. 1 are formed on the claw portion 82 . The groove 100 is formed in a shape concaved outward in the radial direction of the disc at the center in the circumferential direction of the disc.

As shown in FIG. 1 and FIG. 4 , the side of the brake disc axially close to the bridging portion 81 of the hydraulic cylinder portion 80 is formed with a spin-out side protruding portion 102 that protrudes toward the brake disc spin-out side on the radially outer side of the brake disc. In addition, as shown in FIGS. 4 and 5 , on the side of the claw portion 82 that is close to the bridging portion 81 in the brake disc axial direction, there is also formed a spin-out side that protrudes toward the brake disc spin-out side on the radially outer side of the brake disc. protrusion 103 .

As shown in FIG. 4 , the brake pad pin 77 is connected to the insertion hole 102 a extending in the axial direction of the brake disc on the unscrew-out side protrusion 102 of the brake caliper body 75 and the edge of the unscrew-out side protrusion 103 . An insertion hole 103a extending in the axial direction of the rotor is fitted. A guide shaft portion 104 having a constant outer diameter is formed on the brake pad pin 77 and is arranged between the unscrew-side protrusion 102 and the unscrew-side protrusion 103 in the fitted state. The brake pad pin 77 is made of metal, and the brake pad pin 77 is arranged on the brake caliper body 75 along the brake disc axial direction such that the guide shaft portion 104 is closer to the outer side of the brake disc radial direction than the brake disc 4 and is closer to the outer side than the bridge portion 81. The position close to the side where the brake disc spins out straddles the brake disc 4 .

As shown in FIG. 2 , a pair of brake pads 7 and 8 are provided on both sides of the brake disc 4 and are supported by the torque receiving shaft portion 41 of the kingpin 29 and the guide shaft portion 104 of the brake pad pin 77 . Specifically, the brake pad (first brake pad) 7 is arranged on one side of the brake disc 4 , that is, the outer side, and the brake pad (second brake pad) 8 is arranged on the other side of the brake disc 4 . One side is the inside.

The brake pads 7 and 8 are mirror-symmetrical with respect to the brake disc 4, and each has a friction material 106 that contacts the brake disc 4 to generate frictional resistance, and a metal plate-like material that holds the friction material 106 on the main plate portion 108. Backplane 107 . That is, a common back plate 107 is used for the outer brake pad 7 and the inner brake pad 8, and the common friction material 106 is fixed on the outer side of the back plate 107 in reverse. On the moving pad 7 and the brake pad 8 on the inner side. That is to say, the back plate 107 is a common member shared with the outer brake pad 7 and the inner brake pad 8 .

The back plate 107 will be described taking the outer brake pad 8 shown in FIG. 5 as an example. The back plate 107 has: the above-mentioned main plate portion 108, an end protruding portion 109 protruding from the radially outer side of the brake disc of the main plate portion 108 to the brake disc screw-in side, The end protrusion 110 protruding out of the side. An insertion hole 111 penetrating in the axial direction of the brake disc is formed on the end protruding part 109 on the side where the brake disc is screwed in. The insertion hole 111 is an approximately square polygon with rounded corners. In addition, as shown in FIG. 4 , an engaging hole 112 penetrating in the brake disc axial direction is formed in the end protrusion 110 . The engaging hole 112 is a long hole that is long in the circumferential direction of the brake disc.

The torque bearing shaft portion 41 of the main pin 29 is inserted into the insertion hole 111 formed on the brake pad 7, 8 on the brake disc screw-in side, and the guide shaft portion 104 of the brake pad pin 77 is inserted into the brake pad 7, 8. The brake disc on the 8 is screwed out of the engaging hole 112 on the side. The torque receiving shaft portion 41 of the kingpin 29 is slidably supported in the insertion hole 111 of the brake pad 7, 8, and the brake pad is slidably supported in the engagement hole 112 of the brake pad 7, 8. The guide shaft portion 104 of the sheet pin 77. Accordingly, sliding of the brake disc in the axial direction is guided by the torque receiving shaft portion 41 and the guide shaft portion 104 .

As described above, the torque receiving shaft portion 41 on one end side of the kingpin 29 is inserted into the insertion holes 111 , 111 provided at the ends of the pair of brake pads 7 , 8 . Here, the engaging holes 112 , 112 into which the brake pad pins 77 are inserted are in the shape of elongated holes in the circumferential direction of the brake disc. Therefore, the movement of the pair of brake pads 7 and 8 in the disc circumferential direction can be restricted by the contact between the insertion holes 111 and 111 and the torque receiving shaft portion 41 . Therefore, the torque receiving shaft portion 41 of the main pin 29 of the bracket 3 is in contact with the insertion holes 111, 111 to withstand the friction caused by the pair of brake pads 7, 8 contacting the brake disc 4 during forward braking. The braking torque generated on the brake pads 7,8. In addition, the king pin 29 receives the braking torque of the pair of brake pads 7 and 8 at the time of forward braking on the side where the brake disc is screwed in. Since the engaging holes 112 and 112 can move in the radial direction of the brake disc, the brake pad pin 77 does not receive braking torque.

In other words, the bracket 3 is provided with a main pin 29 on the side where the brake disc is screwed in, for a pair of brake pads 7, 8 to slide. The pair of brake pads 7 and 8 are respectively provided with insertion holes 111 for inserting the main pin 29 on the respective brake disc screw-in sides. In addition, an engaging hole 112 , which is an engaging portion that engages with the caliper 5 , is formed in a portion other than the insertion hole 111 . Neither the outer brake pad 7 nor the inner brake pad 8 is supported on the mounting frame 28 , but on the king pin 29 of the bracket 3 and the brake pad pin 77 of the brake caliper 5 . Furthermore, the hydraulic cylinder portion 80 of the brake caliper 5 is arranged on the side opposite to the brake disc 4 of the outer brake pad 7 , and the hydraulic cylinder portion 80 of the brake caliper 5 is arranged on the side opposite to the brake disc 4 of the inner brake pad 8 . On the side, the claw portion 82 of the brake caliper 5 is arranged.

In the disc brake 1 having the above configuration, the caliper 5 is attached to the bracket 3 in advance before the front fork 2 is attached to the vehicle body side. That is, for example, in a state where the engaging portion 94 of the cover 14 is engaged with the sliding portion 87 of the caliper body 75 , the fitting hole 89 of the sliding portion 87 or the guide shaft of the king pin 29 of the bracket 3 Grease is applied to the portion 45 , the guide shaft portion 45 is fitted into the fitting hole 89 , and the engaging portion 92 of the cover 14 is engaged with the intermediate shaft portion 43 and the flange portion 44 of the master pin 29 .

Next, after the torque receiving shaft portion 41 of the king pin 29 of the bracket 3 is inserted into the insertion hole 111 of the brake pad 7 , the torque receiving shaft portion 41 is inserted into the insertion hole of the brake pad 8 . Then, the brake pad pin 77 is inserted into the insertion hole 102a of the unscrewing-side protrusion 102, the engagement hole 112 of the brake pad 7, the engagement hole 112 of the brake pad 8, and the penetration of the unscrew-side protrusion 103. It is inserted into the hole 103a to be fixed to the unscrewing-side protrusions 102, 103.

On the other hand, after fitting the fitting slide portion 69 of the cover 12 into the fitting hole 88 of the sliding portion 86 of the caliper 5 shown in FIG. Grease is applied to the guide portion 63 , the sleeve 10 is inserted into the cover 12 , and the engaging portions 67 , 67 at both ends of the cover 12 are fitted into the small diameter portions 61 , 61 on both sides of the sleeve 10 . Then, in order to stabilize the attitude of the bracket 3 relative to the caliper 5, the mounting bolt 9 is inserted into the sleeve 10, and the threaded shaft portion 56 of the mounting bolt 9 is slightly screwed into the threaded hole 33 of the bracket 3 to temporarily stuck.

Prior to this, work prior to installation of the front fork 2 is performed by, for example, a manufacturer of a disc brake.

Then, when installing the above-mentioned assembly to the front fork 2, for example, first, the mounting bolt 9 is taken out from the threaded hole 33 where the mounting bolt 9 is temporarily locked, and the threaded shaft portion 56 is retracted into the sleeve 10. Then, arrange the above assembly so that the mounting portion 24 of the caliper bracket 21 is located between the sleeve 10 and the mounting portion 35 of the mounting frame 28 of the bracket 3, and the mounting bolt 9 protrudes from the sleeve 10 and is inserted into the caliper bracket 21 mounting holes 22 . Then, the threaded shaft portion 56 is screwed into the threaded hole 33 of the mounting bracket 28 . On the other hand, the mounting bolts 13 shown in FIG. 6 are inserted into the mounting holes 23 of the caliper bracket 21 to be screwed into the screw holes 34 of the mounting bracket 28 . Then, these mounting bolts 9, 13 are tightened with a predetermined torque. Then, the wheel to which the brake disc 4 is attached is attached to the front fork 2 so that the brake disc 4 is arranged between the brake pads 7 and 8 . In this way, the disc brake 1 is mounted on the vehicle.

In the disc brake 1 having the above configuration, when the vehicle is moving forward, the brake fluid is introduced into the cylinder bore through the pipe connection hole 98 of the hydraulic cylinder portion 80 of the brake caliper 5 shown in FIG. 1 through the brake pipe (not shown). 97 , the piston 76 of the caliper 5 advances toward the claw portion 82 shown in FIG. 2 by the brake hydraulic pressure. Then, the piston 76 protrudes toward the brake disc 4 in the disc axial direction, and presses the outer brake pad 7 , which is one of the pair of brake pads 7 and 8 . As a result, the outer brake pad 7 slides along the torque receiving shaft portion 41 of the kingpin 29 and the guide shaft portion 104 of the brake pad pin 77 to come into contact with the brake disc 4 .

On the other hand, under the action of the reaction force, the brake caliper body 75 slides along the guide shaft portion 45 of the kingpin 29 and the sliding guide portion 63 of the mounting member 11 shown in FIG. 4 side movement, by pressing the inner brake pad 8 with the claw portion 82 . As a result, the inner brake pad 8 slides along the torque receiving shaft portion 41 of the kingpin 29 and the guide shaft portion 104 of the brake pad pin 77 shown in FIG. 4 , and comes into contact with the brake disc 4 . In this way, the pair of brake pads 7 and 8 provided on both surfaces of the brake disc 4 are brought into contact with the brake disc 4, and the brake disc 4, that is, the wheel, is braked by the frictional resistance thereof.

In addition, during the above-mentioned braking when the vehicle is moving forward, a braking torque is generated on the pair of brake pads 7 and 8 from the disc screw-in side to the brake disc screw-out side. The one king pin 29 on the side where the brake disc is screwed receives the braking torque in the rotation direction of the brake disc through the insertion hole 111 abutting on the king pin 29 . On the other hand, the pad pin 77 of the caliper 5 is supported together with the pair of brake pads 7 and 8 by the engaging hole 112 which is long in the direction of rotation of the brake disc. Accordingly, a predetermined gap is provided between the engaging hole 112 and the pad pin 77 in the disc rotation direction, and no braking torque is received from the pair of brake pads 7 , 8 . That is to say, the disc brake 1 is configured as a pull-type disc brake that receives the braking torque during braking on the side where the disc is screwed in. During braking when the vehicle is moving forward, only the side of the disc that is screwed in A main pin 29 bears the braking torque generated on a pair of brake pads 7,8.

Here, in the disc brake described in Patent Document 1, the slide bolt is screwed and fixed to the vehicle body, and the slide bolt is slidably fitted to the caliper. Therefore, when attaching the brake caliper to the vehicle body, it is necessary to apply grease to the sliding portion and attach a cover covering the sliding portion, which complicates the work of attaching the caliper to the vehicle body and reduces productivity. In other words, when the brake caliper is attached to the vehicle body, man-hours are increased simply by applying the grease and attaching the cover. In addition, since the grease is applied when the brake caliper is attached to the vehicle body, foreign matter is easily mixed into the grease. As a result, the frequency of foreign matter removal work becomes high when foreign matter is mixed. In addition, since the grease is applied when the brake caliper is attached to the vehicle body, the possibility of the grease adhering to other components increases, and the frequency of work to remove the grease from parts that do not need to be applied becomes high.

In contrast to the above, according to the disc brake 1 of the present embodiment, the caliper 5 is slidably supported by the kingpin 29 provided on the bracket 3 different from the vehicle body. Therefore, before installing the bracket 3 and the brake caliper 5 to the vehicle body, the king pin 29 of the bracket 3 can be slidably arranged on the side of the brake caliper 5 without performing any work of engaging the vehicle body. Fitting hole 89. Therefore, these sliding parts (guide shaft portion 45 and fitting hole 89 ) can be pre-applied with grease and covered with cover 14, and in this state, bracket 3 and brake caliper 5 can be installed. On the front fork 2 on the body side. Therefore, it is not necessary to apply grease to the sliding portion and attach the cover 14 covering the sliding portion when attaching the brake caliper 5 to the vehicle body side. As a result, the installation work to the vehicle body becomes easy, and productivity can be improved.

In addition, since the brake caliper 5 and the brake pads 7, 8 are slidably supported by the king pin 29 provided on the bracket 3, the members supporting the brake caliper 5 and the brake pads 7, 8 are provided separately. Compared with the case of 8 parts, the number of parts can be reduced. Therefore, cost reduction and weight reduction can be achieved.

In addition, one end side of the mounting member 11 having the threaded shaft portion 56 for mounting to the vehicle body is fixed to the front fork 2 , and the slide guide portion 63 on the other end side is slidably arranged in a fitting provided on the brake caliper 5 . In the hole 88, before mounting the bracket 3 and the brake caliper 5 to the vehicle body, the mounting member 11 can be mounted in advance to the fitting hole 88 of the brake caliper 5 without performing any work of engaging with the vehicle body. Therefore, grease is applied to the sliding part (slide guide part 63 and fitting slide part 69 ) in advance on the mounting member 11 and covered by the cover 12 , and the mounting member 11 is mounted on the front side of the vehicle body in this state. Fork 2 on. Therefore, when attaching the brake caliper 5 to the vehicle body side, it is not necessary to apply grease to the sliding portion of the attachment member 11 , and it is not necessary to attach the cover 12 covering the fitting sliding portion 69 . Therefore, the work of attaching to the vehicle body becomes easy, and productivity can be improved.

In addition, the gap between the kingpin 29 and the fitting hole 89 of the caliper 5 is smaller than the gap between the mounting member 11 and the fitting hole 88 of the caliper 5 . As a result, the brake caliper 5 can be accurately guided by the king pin 29, and the gap between the other mounting member 11 and the fitting hole 88 of the brake caliper 5 can be increased to facilitate mounting.

In addition, since the caliper 5 is slidably supported by the mounting member 11 and the bracket 3 is fixed to the front fork 2, common use of parts, weight reduction, and cost reduction can be achieved.

In addition, since the bracket 3 is fixed to the front fork 2 by the mounting bolts 13, mounting work becomes easy.

In addition, a pair of brake pads 7, 8 slides along a king pin 29 disposed on the brake disc screw-in side of the bracket 3, and this king pin 29 is subjected to a pair of brake pads during braking when the vehicle is moving forward. The braking torque generated on the moving pads 7 and 8 in the direction of rotation of the brake disc. Therefore, since the braking torque is borne by the side of the brake disc screw-in, no self-amplification effect is generated, so the contact pressure on the brake disc screw-in side of the brake pads 7 and 8 during braking can be reduced, and the contact pressure can be achieved. Homogenization. Thereby, the one-side abrasion of the brake pads 7 and 8 can be reduced, and the service life of the brake pads 7 and 8 can be extended, the brake operation amount can be reduced, and the brake operation feeling can be improved. In addition, brake noise can be suppressed.

In addition, one king pin 29 receives the braking torque in the direction of the brake disc rotation generated on the pair of brake pads 7 and 8 during the braking when the vehicle is moving forward, so that the structure can be simplified and the productivity can be improved. . In particular, there is no need to form a torque receiving portion on the mounting frame 28 of the bracket 3, so the shape of the mounting frame 28 can be simplified and productivity can be improved.

In addition, since the common back plate 107 can be used for both brake pads 7 and 8, it is possible to reduce the types of components and reduce manufacturing costs and management costs.

A cover 12, which is an elastic member, is attached between the mounting member 11 and the fitting hole 88, and the gap between the mounting member 11 and the fitting hole 88 is formed to include the cover 12, so even if a gap is ensured, loosening of parts can be suppressed. Wait.

The disc brake in the above embodiment has: a pair of brake pads provided on both sides of a brake disc that rotates together with the wheels of the vehicle; The first brake pad protrudes and presses the piston and the claw portion that presses the second brake pad; the first support member has one end side inserted into the inserts provided at the ends of the pair of brake pads respectively. The other end side of the hole is slidably arranged in the first fitting hole provided on the brake caliper along the axial direction of the brake disc; the bracket is fixed on the first fitting hole provided with the first support member On the vehicle body; the second support member, one end side is fixed on the vehicle body, and the other end side is slidably arranged in the second fitting provided on the brake caliper along the axial direction of the brake disc. inside the hole. The first support member contacts the insertion holes of the pair of brake pads during braking to receive a braking torque, and the clearance ratio between the first support member and the first fitting hole is set. The gap between the second supporting member and the second fitting hole is small.

In this way, since the caliper is slidably supported by the first support member provided on the bracket, grease can be applied to these sliding portions before mounting the bracket and the caliper to the vehicle body. Therefore, it is not necessary to apply grease to the sliding portion when attaching the brake caliper to the vehicle body side. Therefore, the installation work to the vehicle body can be facilitated and the productivity can be improved. In addition, since the brake caliper and the brake pad are slidably supported by the first supporting member provided on the bracket, compared with the case where the member supporting the brake caliper and the member supporting the brake pad are provided separately, The number of parts can be reduced. Therefore, cost reduction and weight reduction can be achieved. In addition, since the gap between the first support member and the first fitting hole of the caliper is smaller than the gap between the second support member and the second fitting hole of the caliper, the caliper can be accurately guided by the first support member. , and increase the gap between the second support member and the second fitting hole of the brake caliper to facilitate installation.

Additionally, the bracket may be secured to the vehicle body by at least one mounting threaded member. Thereby, when fixing the bracket to the vehicle body side, the installation work becomes easy.

In addition, the bracket may be fixed to the vehicle body at one end side of the second support member. Thereby, the second support member can be arranged in advance in the second fitting hole of the caliper before the caliper is attached to the vehicle body. Therefore, grease can be applied to these sliding parts in advance before mounting the bracket and the caliper to the vehicle body, so it is not necessary to apply grease to the sliding parts when mounting the caliper to the vehicle body. Therefore, the work of attaching to the vehicle body becomes easy, and productivity can be improved.

The first support member may be in contact with the insertion holes of the pair of brake pads on the side where the brake disc is screwed in during braking to receive the braking torque. In this way, the braking torque in the rotation direction of the brake disc generated on the pair of brake pads during braking when the vehicle moves forward is received by the first support member on the side where the brake disc is screwed in. Therefore, since the braking torque is received by the disc screw-in side, there is no self-amplification effect, so the contact pressure on the brake disc screw-in side of the brake pad during braking can be reduced, and the contact pressure can be uniformed. Accordingly, it is possible to reduce wear on one side of the brake pad, thereby prolonging the life of the brake pad, reducing the amount of brake operation, and improving the brake operation feeling. In addition, brake noise can be suppressed. On this basis, one torque receiving pin receives the braking torque in the rotation direction of the brake disc generated on the pair of brake pads during the braking when the vehicle is moving forward, so the structure can be simplified and the productivity can be improved. improve. In particular, since there is no need to form a torque receiving portion on the mounting frame of the bracket, the shape of the mounting frame can be simplified and productivity can be improved. Since the common back plate is used for both brake pads, it is possible to reduce the types of parts and reduce manufacturing costs and management costs.

An elastic member is installed between the second supporting member and the second fitting hole, and the gap may be formed to include the elastic member. Thereby, even if a gap is ensured, it is possible to suppress looseness of components and the like.

Industrial Applicability

According to the above-mentioned means, productivity can be improved.

Explanation of reference signs

1 disc brake

3 bays

4 brake discs

5 brake calipers

7, 8 Brake pads

11 Mounting part (second supporting part)

12 cover (elastic part)

13 Mounting bolts (mounting threaded parts)

29 kingpin (the first supporting part)

76 pistons

82 claws

88 fitting holes (second fitting hole)

89 fitting holes (the first fitting hole)

111 insertion hole

Claims (8)

1. A disc brake having: a pair of brake pads disposed on either side of a brake disc that rotates with the wheels of the vehicle; a brake caliper having a piston pressing by protruding a first brake pad of the pair of brake pads and a claw portion pressing a second brake pad; The disc brake is also characterized by: The first support member has one end inserted into the insertion holes respectively provided at the ends of the pair of brake pads, and the other end is slidably disposed on the brake caliper along the axial direction of the brake disc. in the first fitting hole; a bracket, on which the first supporting member is arranged and fixed on the vehicle body; a second support member, one end of which is fixed to the vehicle body, and the other end is slidably arranged in a second fitting hole provided on the brake caliper along the axial direction of the brake disc; The first support member contacts the insertion holes of the pair of brake pads during braking to receive braking torque, A gap between the first support member and the first fitting hole is smaller than a gap between the second support member and the second fitting hole. 2. A disc brake according to claim 1, characterized in that, The bracket is fixed to the vehicle body on the one end side of the second support member. 3. A disc brake according to claim 2, characterized in that, The first support member contacts the insertion holes of the pair of brake pads on the side where the brake disc is screwed in during braking to receive the braking torque. 4. A disc brake according to claim 3, characterized in that, An elastic member is attached between the second supporting member and the second fitting hole, and a gap between the second supporting member and the second fitting hole is formed to include the elastic member. 5. The disc brake of claim 1, wherein: The first support member contacts the insertion holes of the pair of brake pads on the side where the brake disc is screwed in during braking to receive the braking torque. 6. The disc brake of claim 5, wherein: An elastic member is attached between the second supporting member and the second fitting hole, and a gap between the second supporting member and the second fitting hole is formed to include the elastic member. 7. The disc brake of claim 1, wherein: An elastic member is attached between the second supporting member and the second fitting hole, and a gap between the second supporting member and the second fitting hole is formed to include the elastic member. 8. The disc brake according to any one of claims 1 to 7, characterized in that: The bracket is fixed on the vehicle body by at least one mounting threaded part.