GB2185079A - Disc brake - Google Patents

Disc brake Download PDF

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Publication number
GB2185079A
GB2185079A GB08600132A GB8600132A GB2185079A GB 2185079 A GB2185079 A GB 2185079A GB 08600132 A GB08600132 A GB 08600132A GB 8600132 A GB8600132 A GB 8600132A GB 2185079 A GB2185079 A GB 2185079A
Authority
GB
United Kingdom
Prior art keywords
ofthe
pair
brake
spring elements
pad
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB08600132A
Other versions
GB8600132D0 (en
GB2185079B (en
Inventor
Kenneth Maurice Quiney
William Ernest Haines
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Automotive Products PLC
Original Assignee
Automotive Products PLC
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 Automotive Products PLC filed Critical Automotive Products PLC
Priority to GB8600132A priority Critical patent/GB2185079B/en
Publication of GB8600132D0 publication Critical patent/GB8600132D0/en
Publication of GB2185079A publication Critical patent/GB2185079A/en
Application granted granted Critical
Publication of GB2185079B publication Critical patent/GB2185079B/en
Expired legal-status Critical Current

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
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
    • F16D65/092—Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
    • F16D65/095—Pivots or supporting members therefor
    • F16D65/097—Resilient means interposed between pads and supporting members or other brake parts
    • F16D65/0973—Resilient means interposed between pads and supporting members or other brake parts not subjected to brake forces
    • F16D65/0979—Resilient means interposed between pads and supporting members or other brake parts not subjected to brake forces acting on the rear side of the pad or an element affixed thereto, e.g. spring clips securing the pad to the brake piston or caliper
    • 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
    • F16D55/22—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 by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—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 by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/225—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 by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
    • F16D55/226—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 by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
    • F16D55/2265—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 by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes the axial movement being guided by one or more pins engaging bores in the brake support or the brake housing
    • F16D55/227—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 by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes the axial movement being guided by one or more pins engaging bores in the brake support or the brake housing by two or more pins
    • 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
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
    • F16D65/092—Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
    • F16D65/095—Pivots or supporting members therefor
    • F16D65/097—Resilient means interposed between pads and supporting members or other brake parts
    • F16D65/0973—Resilient means interposed between pads and supporting members or other brake parts not subjected to brake forces
    • F16D65/0974—Resilient means interposed between pads and supporting members or other brake parts not subjected to brake forces acting on or in the vicinity of the pad rim in a direction substantially transverse to the brake disc axis
    • F16D65/0977—Springs made from sheet metal
    • F16D65/0978—Springs made from sheet metal acting on one pad only
    • 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
    • F16D2055/0004—Parts or details of disc brakes
    • F16D2055/007—Pins holding the braking members

Landscapes

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

Abstract

A spring clip 29, for retaining one brake pad 19 of a disc brake against the limb of the brake caliper 11 which is remote from the brake actuator 26, 27, has a first pair of spring elements 31 extending one on either side from one flange (32, Figure 3) of an angular central portion (30), for engagement with the outside face of the limb; and a second pair of spring elements 33 extending one on either side from the other flange (34, Figure 4) of the central portion (30), for engagement with the face of the backing plate 20 of brake pad 19 which is remote from the limb. <IMAGE>

Description

SPECIFICATION Disc brakes This invention relates two disc brakes particularly, but not exclusively, for braking the road wheels of automobiles.
Typically a disc brake comprises a disc secured for rotation with the road wheel, a caliper assembly which straddles a portion ofthe peripheral edge of the disc and a support member mounted on a non-rotary part of the vehicle, upon which the caliper is slidingly located for movement relative to the disc, in a direction parallel to the axis of rotation of the disc.
The calliper comprises a pair of parallel limbs which overlap and are parallel to the disc, these limbs being interconnected buy a pair of transverse limbs which are spaced radially from the periphery ofthe disc. A pair of brake pads are located, one on either side of the disc, between the parallel limbs of the caliper. The brake pads comprise backing plates having pads of friction material on the faces thereof adjacent the disc. These pads are located radially by means of a pair of pins which extend between the parallel limbs ofthe caliper, outside the periphery of thedisc,the pins passing through holes in the backing plates ofthe pads.The holes in the backing plates are elongated to permitthe pads to move over a small distance circumferentially relative to the disc, so that when brought into engagement with the rotating disc, one ofthe radial edge faces of each backing platewill bebroughtintoengagementwith the corresponding radial face on the caliper, depending on the direction of rotation.
A hydraulic cylinder/piston assembly is associated with one ofthe parellel limbs ofthe caliperand arranged to act on the backing plate ofthe adjacent pad. Application ofthe brakes will cause the hydraulic piston to force the adjacent brake pad into engagement with the disc and then further pressure will cause the caliperto slide on the support member, thereby bringing the opposite pad into engagement with the disc.
On release ofthe brakes, the hydraulic piston moves back sufficiently to provide a clearance for the adjacent pad and to permitthe caliperto slide relative to the support memberso that a clearance is provided forthe other pad.
However, as the pads are freeto move relative to the parallel limbs ofthe caliper, they may remain in engagementwiththediscwhichwill produce drag and will also lead to unnecessary wear of the pad.
Furthermore, the pads will be free to rattle or oscillate between the disc and parallel limbs of the caliper, especiallywhen the disc is outoftrueand suffers from "run-out".
Hitherto it has been proposed to clip the pad which is abutted by the hydraulic piston to the piston, so thatthe pad will move with the piston. It has also been proposed to provide a spring plate abutting the upper edges ofthe backing plates of the two pads so as to bias the backing plates againstthe pins and thus overcome the problem of oscillation. However, this arrangement does not positively locate the pad remotefromthe hydraulic piston, relativetothe adjacent parallel limb ofthe caliper and also the spring plate closes the top ofthe caliper, which adversely affects ventilation of the brake.
The present invention provides for the positive location ofthe pad remote from the hydraulic piston, relative to the adjacent parallel limb ofthe caliper, thereby reducing drag and oscillation ofthat pad.
According to one aspect of the present invention a disc brake includes a caliper having a pair of parallel limbs interconnected at adjacent ends, one of said limbs incorporating a brake actuator; a pair of brake pads each comprising a rigid backing plate with a pad offriction material on one face thereof are disposed between the limbs of the caliper in a parallel relationship thereto with the friction pads opposing one another, said brake pads are supported on a pair of pins mounted between the limbs ofthe caliper; a spring clip having a central portion ofangularconfiguration, one pairofspring elements extending axially one on either side of one flange ofthe central portion and a second pair of spring elements extending axially one on either side of the otherfiange of the central portion, said spring clip being arranged such that said one pair of spring elements resiliently engage the outside ofthe limb of the caliper remote from the brakeactuatorwhile said second pair of spring elements engage againstthe innerface of the backing plate ofthe adjacent brake pad, to bias the brake pad into engagement with the adjacent limb of the caliper.
An embodiment of the invention is now described, by way of example only, with reference to the accompanying drawings, in which: Figure lisa side elevation of a disc brake formed in accordance with the present invention; Figure2 is a partial plan view of th e dise brake shown in Figure 1; Figure 3 is a side elevation ofthe spring clip used in the disc brake illustrated in Figure 1; and Figure 4 is a plan view of the spring clip used in the disc brake illustrated in Figure 1.
As illustrated in Figures 1 and 2, the disc brake comprises a disc 10 mounted for rotation with a road wheel (not shown). A caliper assembly 11 straddles a portion ofthe peripheral edge ofthe disc 10 and is mounted upon support member 12 by means of a pair of pins 13 and 14which permit relative movement between the caliper assembly 11 and support member 12 in a direction parallel to the axis ofthe rotation of disc 10. The support member 12 is mounted on a non-rotary part ofthevehicle by means of bolts passing through holes 15.
The caliper assembly 11 comprises a pair of radially extending parallel limbs 16 and 17which overlap and are parallel to the disc 10, these limbs being interconnected at opposed ends thereof by a pair oftransverse limbs which are spaced radially from the periphery of the disc 10. A pair of brake pads 18 and 19 are located on either side ofthe disc 10 between the parallel limbs 16 and 17 ofthe caliper assembly. The brake pads 18 and 19 each comprise a backing plate 20 having a pad of friction material 21 on the face thereof adjacent the disc 10. The pads 18 and 19 are located radially by means of a pair of pins 22 which extend between the parallel limbs 16 and 17 ofthe caliper, outside the periphery ofthe disc 10, the pins 22 passing through holes 23 in the backing plates 20.The holes 23 are elongated to permit the pads 18 and 19 to move over a small distance circumferentially relative to the disc so that when brought into engagement with the rotating disc 10, the pads 18 and 19 will be dragged along with the disc 10 until one ofthe radial faces 24 on the backing plate 20 of each pad 18 and 19 are brought into engagement with a corresponding radial face 25 on the caliper assembly, depending on the direction of rotation.
A hydrauliccylinder/piston assembly 26,27 forms part of limb 16 ofthe caliper assembly 11,the piston 27 being arranged to act on the backing plate 20 of pad 18. The pad 18 is secured for movementwith the piston 27 by means of a spring clip 28 mounted on the rearface ofthe backing plate of pad 18.
Aspring clip 29 engages the outside face ofthe limb 17 and the inside face ofthe backing plate 20 of pad 19, to urge the pad 19 into engagement with limb 17.
As better illustrated in Figures 3 and 4, the spring clip 29, which is made from resilient material, comprises a central portion 30 of angular configuration, having a pair of spring elements 31 extending axially one on either side ofthe flange 32 ofcentral portion 30 and a second pairofspring elements 33 extending axially one on either side of the flange 34 of central portion 30.Both pairs of spring elements31 and 33 are spacedfrom thefold line ofthe centre portion 30, so that when spring elements 31 engagetheouterfaceoflimb 17 and spring elements33engageunderthepins22,the edges35thereofwill bearagainsttheinnerfaceof the backing plate 20 of pad 19, to urge ittowardsthe limb 17. Furthermore, the spring elements 31 extend underthe heads of pins 22, so that they will retain the spring clip 29 in position. The ends of the spring elements 31 are also bent back away from the rear face of the limb 17, so asto engage atransverse head portion ofthe pins 22 thereby preventing them from rotating.The central portion of the upper edge of limb 17 is cut away to provide a clearanceforthe central portion 30 of clip 29, sothattheforce urging the pad 18 against limb 17 will be provided bythe spring elements 31.
Upon actuation ofthe brakes, hydraulic pressure is applied to the piston 27 which urges the pad 18 into engagement with disc 10. Further application of pressure by the piston 27 causes limb 16 ofthe caliper assembly 11 to move awayfromthe disc 10 on the pins 13and 14Of support member 12. This movement brings pad 18 into engagement with the disc 10. Upon release of the brakes, roll back ofthe seals between the piston 27 and cylinder 26 cause the piston 27 to move back away from the disc 10 and this draws back pad 18 to provide a clearance betweenthe pad 18 and disc 10,the pad 18 being secured to the piston byspring clip 28.Pin 14 on the support member 12 is provided with a rubber boot 40 which has a series of ribs 41 which engage a PTFE sleeve 42 on the pin 14. This arrangement also providessufficient"rolI b ck" onthecaliper assembly 1 1,to allow pad 19to move clearofthe disc 10.
As the pad 19 is resiliently biassed to the limb 17 by means of spring clip 29, it will move backwith the caliper assembly 11 thus avoiding the problems of drag and oscillation that have occurred hitherto.
Also, the clip 19 does not block the space between the limbs 16and 17 ofthe caliper assembly 11 and will not therefore reduce ventilation ofthe brakes.
The resilient clip 29 will however permit some movement ofthe pad 19 relative to the limb 17to allowforany misalignment of the disc 10 orcaliper assembly 11, sothatthe pad 19 mayengageflat againstthe disc 10 when the brake is applied.

Claims (2)

1. A disc brake including a caliper having a pairof parallel limbs interconnected at adjacent ends, one of said limbs incorporating a brake actuator; a pair of brake pads each comprising a rigid backing plate with a pad offriction material on one face thereof are disposed betweenthelimbsofthe-caliperina parallel relationship thereto with the friction pads opposing one another, said brake pads are supported on a pair of pins mounted between the limbs of the caliper; a spring clip having a central portion ofangularconfiguration, dne pairofspring elements extending axially one on either side of one flange ofthe central portion and a second pair of spring elements extending axiallyone on either side oftheotherflangeofthecentralportion,saidspring clip being arranged such thatsaid one pair of spring elements resiliently engage the outside ofthe limb of the caliper remotefrom the brake actuatorwhilesaid second pair of spring elements engage againstthe inner face ofthe backing plate of the adjacent brake pad, to bias the brake pad into engagement with the adjacent limb of the caliper.
2. A dise brake according to Claim 1 in which said one pair of spring elements are provided by extensions of said one flange and said second pair of spring elements are provided by extensions of said otherflange, the extensions oftheflanges defining the spring elements being spaced away from the fold line of the central portion.
2. A disc brake according to Claim 1 in which said one pair of spring elements engageformations on the outside face ofthe limb of the caliper, so asto retain these spring elements in position.
3. A disc brake according to Claim 2 in which said formations are provided by the heads ofthe pins.
4. A disc brake according to Claim 3 in which the pins have transverse head portions and formations are provided on said one pair of spring elementsfor engagement of said transverse head portions to preventthe pins from rotating.
5. A disc brake according to any one of Claims 1 to 4 in which said second pair of spring elements engage formations which maintain these spring elements in engagement with the innerface ofthe backing plate ofthe brake pad.
6. A disc brake according to Claim 5 in which said second pair of spring elements engage underthe pins upon which the brake pad is supported.
7. A disc brake according to any one ofthe preceding claims in which the central portion of the upper edge of the limb of the caliper remote from the brake actuator is cut away to provide a clearance for the central portion ofthe spring clip.
8. A disc brake according to any one ofthe preceding claims in which the pad adjacentto the brake actuator is secured for movement with the brake actuator.
9. A disc brake substantially as described herein with reference to, and as shown in, Figures 1 to 4 of the accompanying drawings.
Amendments to the claims have been filed, and have the following effect: (b) Newortextually amended claims have been filed as follows: (c) Claims 2-9 above have been re-numbered as 3-10 and their appendancies corrected.
GB8600132A 1986-01-04 1986-01-04 Disc brakes Expired GB2185079B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8600132A GB2185079B (en) 1986-01-04 1986-01-04 Disc brakes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8600132A GB2185079B (en) 1986-01-04 1986-01-04 Disc brakes

Publications (3)

Publication Number Publication Date
GB8600132D0 GB8600132D0 (en) 1986-02-12
GB2185079A true GB2185079A (en) 1987-07-08
GB2185079B GB2185079B (en) 1989-10-25

Family

ID=10590912

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8600132A Expired GB2185079B (en) 1986-01-04 1986-01-04 Disc brakes

Country Status (1)

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GB (1) GB2185079B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0877176A3 (en) * 1997-05-05 2000-11-29 Meritor Heavy Vehicle Systems, LLC A disc brake anti-rattle design
EP1452765A2 (en) * 2003-01-30 2004-09-01 Eurofren Brakes S.L.U. Improvements in disc brake pads

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2017236A (en) * 1978-03-23 1979-10-03 Volkswagenwerk Ag Disc Brake of the Floating Calliper Type

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2017236A (en) * 1978-03-23 1979-10-03 Volkswagenwerk Ag Disc Brake of the Floating Calliper Type

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0877176A3 (en) * 1997-05-05 2000-11-29 Meritor Heavy Vehicle Systems, LLC A disc brake anti-rattle design
EP1452765A2 (en) * 2003-01-30 2004-09-01 Eurofren Brakes S.L.U. Improvements in disc brake pads
EP1452765A3 (en) * 2003-01-30 2004-09-08 Eurofren Brakes S.L.U. Improvements in disc brake pads
ES2233163A1 (en) * 2003-01-30 2005-06-01 Revestimientos Especiales Moldeados, S.L. Improvements in disc brake pads

Also Published As

Publication number Publication date
GB8600132D0 (en) 1986-02-12
GB2185079B (en) 1989-10-25

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee