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WO1997048176A1 - Systeme de freinage pour moteurs electriques - Google Patents

Systeme de freinage pour moteurs electriques Download PDF

Info

Publication number
WO1997048176A1
WO1997048176A1 PCT/SE1997/000940 SE9700940W WO9748176A1 WO 1997048176 A1 WO1997048176 A1 WO 1997048176A1 SE 9700940 W SE9700940 W SE 9700940W WO 9748176 A1 WO9748176 A1 WO 9748176A1
Authority
WO
WIPO (PCT)
Prior art keywords
disc
hub
driving
brake
braking system
Prior art date
Application number
PCT/SE1997/000940
Other languages
English (en)
Inventor
Erkki Lahti
Original Assignee
Fhp Elmotor Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fhp Elmotor Ab filed Critical Fhp Elmotor Ab
Priority to AU31126/97A priority Critical patent/AU3112697A/en
Priority to EP97926337A priority patent/EP0903006A1/fr
Publication of WO1997048176A1 publication Critical patent/WO1997048176A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/102—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
    • F16D2125/36—Helical cams, Ball-rotating ramps

Definitions

  • the present invention relates to a braking system for an electric motor, which is adapted to drive, in a predetermined direction of rotation, a rotatable motor shaft, which projects through a bearing plate of the motor for driving an assembly, such as a cutting assembly in a lawnmower, said system comprising a stationary brake element, which is nonrotatable in relation to the bearing plate, a rotatable brake element, which is rotatably and displaceably mounted on the motor shaft, a driving means, which is nonrotatably arranged on the motor shaft between the bearing plate and the rotatable brake element for driving the same, a spring means, which is adapted to axially push the rotatable brake element towards the stationary brake element, a first ramp means, which is fixedly arranged on the driving means on the side facing the rotatable brake element, a second ramp means, which is fixedly arranged on the rotatable brake element on the side facing the driving means, the two ramp means being adapted, when the electric motor drives the motor shaft in said direction
  • Braking systems of the above-mentioned type are known and are used especially in electric rotor lawn- mowers, in which the rotor, for safety reasons, is to be stopped immediately as the motor is switched off. Owing to the relatively difficult surroundings, in which these braking systems must operate, they must, besides being of robust design, also be little sensitive to dirt and easy to maintain. In these respects, the prior art braking systems suffer from obvious drawbacks, and an object of the present invention is to obviate these. A further object of the present invention is to provide a braking system which than the prior art braking systems which are often very complicated.
  • a braking system which is of the type mentioned by way of introduction and which is characterised in that the driving means is a substan ⁇ tially circular disc, which has a central tubular hub, which is attached to the motor shaft and which at its end facing away from the motor has a radially projecting collar, and a plurality of recesses, which are dis ⁇ tributed along the circumference of the disc and which each extend over a certain part of the circumference, that the stationary brake element projects radially beyond the disc, and that the rotatable brake element is a substantially circular brake disc, which has a central hub surrounding the hub of the driving disc and which, for the purpose of being driven by means of the recesses of the driving disc, has a plurality of projections, which project axially towards the driving disc and which extend over a smaller extent in the circumferential direction than the recesses of the driving disc, with which recesses they engage with play, the collar on the hub of the driving disc being adapted to retain the brake disc on this hub, and the spring
  • both the driving means and the rotat ⁇ able brake element as simple discs with engaging portions (the recesses of the driving disc and the projections of the brake disc) which are arranged far away from the centre of the discs and, thus, subjected but to a small load
  • disc materials can be selected that are both in ⁇ expensive to purchase and easy to work and, consequently, the manufacturing cost of the braking system is reduced to a considerable extent.
  • the braking system is very easy to mount thanks to the possibility of designing the components included such that, in mounting as a pre- assembled unit, they are pushed onto the motor shaft.
  • the driving disc and the brake disc are made of metal sheet, and the recesses and projections are made by punching of the metal sheet.
  • Metal sheet is a very inexpensive mate ⁇ rial which is also very easy to work.
  • the cost of this embodiment is reduced to an absolute minimum, especially if the above-mentioned ramp means are also made by punching of the metal sheet.
  • At least one of the ramp means is a ring made of plastic, which at its one side has pins for engaging in the corresponding apertures in the driving disc and the brake disc and, at its other side, has uniformly distributed ramp surfaces. It is easy to understand that this embodiment is prefer ⁇ red since it permits the use of comparatively tough and strong plastic materials for the ramp means.
  • the employed spring means preferably is a helical spring, which surrounds the hub of the driving disc, and the hub of the brake disc preferably has an axial abut ⁇ ment bore with a narrower portion for the hub of the driving disc and a wider portion for the helical spring.
  • the helical spring will be easy to mount and besides is protected by the surrounding hub from contact with the surroundings.
  • a tubular bush is suitably arranged between the hub of the driving disc and the narrower portion of the bore, the bush having a radially projecting collar, which is placed between the helical spring and the abutment of the bore.
  • the object of the tubular bush which preferably is made of plastic, is to reduce the friction between on the one hand the hub of the driving disc and the helical spring and, on the other hand, the hub of the brake disc.
  • the helical spring is fixed between the collar on the hub of the driving disc and the abutment of the bore. In combination with the other components mounted on the hub of the driving disc, this embodiment facili- tates the mounting operation quite significantly.
  • the hub of the brake disc is cylindrical and has external circum ⁇ ferential key grooves for guiding a driving belt, which constitutes a part of the assembly driven by the motor.
  • the driving belt is used to drive, for instance, a cutting assembly, whose belt pulley intended for the driving belt suitably has a larger diameter than the hub of the brake disc in order to accomplish a gear change which both permits the use of an electric motor which is smaller but has a higher speed, and reduces the load to which the braking system is subjected.
  • the stationary brake element comprises a plurality of brake blocks, and a plurality of recesses are formed in the bearing plate of the motor, in which recesses the brake blocks are mounted.
  • the driving disc preferably has a central hole for its hub, whose end opposite the end with the collar has a shoulder, against which the driving disc rests, and an upset portion, which nonrotatably connects the driving disc with its hub.
  • Fig. 1 is an exploded view of an electric motor with a braking system and a driving belt associated therewith;
  • Fig. 2 is a sectional view of a braking system in its neutral position;
  • Fig. 3 is a corresponding sectional view of the braking system in its braking position.
  • Fig. 1 shows an electric motor 1, which has a motor shaft 2 projecting through a bearing plate 3 of the motor 1 in order to drive, via a driving belt 4, a cut ⁇ ting assembly (not shown) in a lawnmower.
  • an inventive braking system which is generally designated 5, is connected between the motor 1 and the driving belt 4.
  • the braking system 1 comprises a plate-shaped, substantially circular driver 6, which is made of metal sheet and has a central hub 7 for nonrotatable mounting of the driver 6 on the motor shaft 2.
  • the driver 6 has, along its circumference, six uniformly distributed re ⁇ Waits 8, each extending over about 1/12 of the circum ⁇ ference of the driver 6.
  • the driver also has four punched apertures 9, which are uniformly distributed around the central hub 7 of the driver 6.
  • the braking system 5 also comprises a brake disc 10, which is also plate-shaped and substantially circular.
  • the brake disc 10, which is made of metal sheet, has a central hub 11, which is adapted to be mounted on the hub 7 of the driver by means of a bush 17 in an axially and rotatably displaceable manner.
  • the brake disc 10 has a flat brake surface 13, in which six projections 14 are formed by punching.
  • the projections 14 are adapted to engage, with play, in the recesses 8 of the driver 6 and extend in the circumferen- tial direction over a smaller part of the circumference of the driver 6 (about 1/24) .
  • the brake disc 10 has apertures 15 corresponding to the apertures 9 in the driver 6.
  • two plastic rings 16, 17 are arranged.
  • the rings 16, 17 are identical and have on their one side four pins 18, which are adapted to engage in the apertures 9 and 15 in the driver 6 and the brake disc 10, and on their opposite side four ramp surfaces 19, which are symmetrically arranged along the circumference of the rings 16, 17.
  • the braking system 5 comprises a helical spring 20, which is adapted to press the brake disc 10 in the direction of the electric motor 1 and, by means of a collar 21 on the driver hub 7, which is adapted to be fixed to the free end of the motor shaft 2, to hold the bush 12, the brake disc 10 and the rings 16, 17 in place.
  • the braking system 5 comprises three brake blocks 24, which are fixedly mounted in suitable recesses 25 in the bearing plate 3 of the motor and are adapted to brake, in cooperation with the brake surface 13 of the brake disc 10, said cutting assembly when the motor shaft 2 of the motor 1 ceases to drive.
  • Figs 2 and 3 illustrate some details more clearly than in the exploded view in Fig. 1.
  • the hub 11 has an axial abutment bore 26 with a narrower portion 27 and a wider portion 28.
  • the bush 12 is inserted, resting with a circum ⁇ ferential collar 29 against the abutment 36 of the bore 28.
  • the helical spring 20 is accommodated, one end thereof resting against the collar 21 of the hub 7 and the other end resting against the collar 29 of the bush 12.
  • the driver 6 has a central hole 22 and the hub 7 has at the end opposite its collar 21 a shoulder 23, against which the driver 6 rests.
  • the end of the hub 7 above the shoulder 23 extends through the hole 22 and is, for non- rotatable connection of the driver and the hub, upset at 36, the upset portion being provided only after mounting of the brake disc 10, the bush 12, the rings 16, 17 and the spring 20 on the hub 7.
  • the hub 11 of the brake disc 10 has circumferential key grooves 30 for engagement with corresponding portions 31 (Fig. 1) of the driving belt 4.
  • the hub 11 thus serves as a belt pulley for driving the cutting assembly.
  • Fig. 2 shows the braking system 5 in its neutral position when the electric motor 1 drives the motor shaft 2. This condition is illustrated by means of the arrow 32, which also indicates the direction of rotation.
  • the motor shaft 2 drives in the direction 32, the ramp surfaces 19 of the rings 16, 17 climb on to each other and the brake disc 10 is moved in the direction of the arrow 33 away from the brake blocks 24.
  • the motor shaft 2 can thus rotate freely and unimpededly drive the cutting assembly via the driving belt 4.
  • Fig. 3 shows the braking system 5 in its braking position when the brake surface 13 of the brake disc 10 engages the brake blocks 24.
  • the motor 1 has stopped to drive its motor shaft 2, which is illustrated in Fig. 3 by the arrow 32 being cancelled.
  • the brake disc 10 is pressed upwards by the helical spring 20 in the direction of arrow 34 to ⁇ wards the motor, and the ramp surfaces 19 of the rings 16, 17 slide down on each other.
  • driver 6 as well as the brake disc 10, which in the embodiment shown are metal- sheet constructions, can also be constructions of some other type, such as components turned in a lathe.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

L'invention concerne un système de freinage (5) pour moteur électrique (1), comprenant un dispositif d'entraînement de frein discoïde (6) qui entraîne un disque de frein (10) au moyen du moteur (1). Le disque de frein (10) entraîne à son tour un ensemble tel que l'ensemble de coupe d'une tondeuse à gazon à rotor. Un jeu est prévu entre l'entraînement (6) et le disque de frein (10), permettant à des surfaces à plans inclinés (19), qui sont comprimées ensemble par un ressort hélocoïdal (20), de s'éloigner du disque de frein (10) du moteur (1) et de ne plus être en contact avec les patins de frein (24).
PCT/SE1997/000940 1996-05-31 1997-05-30 Systeme de freinage pour moteurs electriques WO1997048176A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU31126/97A AU3112697A (en) 1996-05-31 1997-05-30 Braking system for electric motors
EP97926337A EP0903006A1 (fr) 1996-05-31 1997-05-30 Systeme de freinage pour moteurs electriques

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9602128A SE505313C2 (sv) 1996-05-31 1996-05-31 Bromssystem
SE9602128-2 1996-05-31

Publications (1)

Publication Number Publication Date
WO1997048176A1 true WO1997048176A1 (fr) 1997-12-18

Family

ID=20402801

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/000940 WO1997048176A1 (fr) 1996-05-31 1997-05-30 Systeme de freinage pour moteurs electriques

Country Status (4)

Country Link
EP (1) EP0903006A1 (fr)
AU (1) AU3112697A (fr)
SE (1) SE505313C2 (fr)
WO (1) WO1997048176A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0957565A3 (fr) * 1998-05-14 2001-01-24 SEW-EURODRIVE GMBH & CO. Moteur électrique avec frein
CN102678887A (zh) * 2011-03-07 2012-09-19 红门智能科技股份有限公司 减速机及其使用的电机刹车
US9373987B2 (en) 2013-09-11 2016-06-21 Honda Motor Co., Ltd. Integrated flywheels, systems and methods for electric generation and braking of a general purpose engine
US20170370429A1 (en) * 2014-12-26 2017-12-28 Oriental Motor Co., Ltd. Friction brake structure

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102860180B (zh) * 2011-07-05 2014-10-15 南京德朔实业有限公司 刹车装置
CN104170590B (zh) * 2013-05-27 2017-06-13 苏州金莱克精密机械有限公司 具有改良刹车结构的电动工具及其电机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3243021A (en) * 1961-12-26 1966-03-29 Philco Corp Drive mechanism
US3731472A (en) * 1972-03-27 1973-05-08 Simplicity Mfg Co Inc Rotary mower spindle brake
US5293731A (en) * 1991-07-03 1994-03-15 Black & Decker Inc. Lawn mower
US5407400A (en) * 1992-03-14 1995-04-18 Black & Decker Inc. Braking system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3243021A (en) * 1961-12-26 1966-03-29 Philco Corp Drive mechanism
US3731472A (en) * 1972-03-27 1973-05-08 Simplicity Mfg Co Inc Rotary mower spindle brake
US5293731A (en) * 1991-07-03 1994-03-15 Black & Decker Inc. Lawn mower
US5407400A (en) * 1992-03-14 1995-04-18 Black & Decker Inc. Braking system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0957565A3 (fr) * 1998-05-14 2001-01-24 SEW-EURODRIVE GMBH & CO. Moteur électrique avec frein
CN102678887A (zh) * 2011-03-07 2012-09-19 红门智能科技股份有限公司 减速机及其使用的电机刹车
US9373987B2 (en) 2013-09-11 2016-06-21 Honda Motor Co., Ltd. Integrated flywheels, systems and methods for electric generation and braking of a general purpose engine
US20170370429A1 (en) * 2014-12-26 2017-12-28 Oriental Motor Co., Ltd. Friction brake structure
US10598235B2 (en) * 2014-12-26 2020-03-24 Oriental Motor Co., Ltd. Friction brake structure

Also Published As

Publication number Publication date
SE9602128L (sv) 1997-08-04
EP0903006A1 (fr) 1999-03-24
SE505313C2 (sv) 1997-08-04
SE9602128D0 (sv) 1996-05-31
AU3112697A (en) 1998-01-07

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