WO2002033282A1 - Spring for retracting and retaining a pad in a caliper type disc brake assembly - Google Patents

Spring for retracting and retaining a pad in a caliper type disc brake assembly Download PDF

Info

Publication number
WO2002033282A1
WO2002033282A1 PCT/US2001/027775 US0127775W WO0233282A1 WO 2002033282 A1 WO2002033282 A1 WO 2002033282A1 US 0127775 W US0127775 W US 0127775W WO 0233282 A1 WO0233282 A1 WO 0233282A1
Authority
WO
WIPO (PCT)
Prior art keywords
spring
pads
brake
brake pads
pad
Prior art date
Application number
PCT/US2001/027775
Other languages
French (fr)
Inventor
Charles Thomas Layton
Eric John Roszman
Sean Christopher Barrett
Original Assignee
Akebono Corporation North America
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 Akebono Corporation North America filed Critical Akebono Corporation North America
Priority to EP01979238A priority Critical patent/EP1336055A4/en
Priority to AU2002211223A priority patent/AU2002211223A1/en
Priority to JP2002536233A priority patent/JP2004511738A/en
Publication of WO2002033282A1 publication Critical patent/WO2002033282A1/en

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
    • F16D65/0974—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
    • F16D65/0975—Springs made from wire
    • 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
    • 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
    • F16D65/0972—Resilient means interposed between pads and supporting members or other brake parts transmitting brake reaction force, e.g. elements interposed between torque support plate and pad

Definitions

  • This invention relates to a caliper-type disc brake.
  • the invention relates to a spring capable, both, of reducing rattle and retracting the brake pads.
  • Pad rattle in a caliper disc brake assembly has been addressed by one of three methods.
  • the brake pads are secured to the brake piston or to the caliper body.
  • the clearances between the pad and the support bracket are reduced or dampening material is placed in the clearances.
  • a special pad clip has been provided to load the pad in a tangential direction.
  • DTN disk thickness variation
  • a spring is installed between the opposed brake pads in such a manner that the spring applies to the pads a force that is directed in both the tangential and radial directions.
  • tangential refers to the direction transverse to the direction of caliper piston movement
  • radial refers to the direction of caliper piston movement.
  • each end of the spring engages a respective hole in the backing plate for a pad.
  • the springs are shaped to apply tangential and radial forces to the pads and, the preferred embodiment uses two S- shaped springs.
  • the tangential force applied by the springs according to the invention increase the slide load of the pad assemblies and the radial force retracts the pads away from the rotor during non-braking.
  • a disc brake is illustrated with rotor 2 and opposed disc brake pads 4 on either side thereof.
  • the disc brake pads 4 are mounted on respective backing plates 8, which include ears 10 or other structure for engaging a groove 12 in caliper, which is only partially illustrated in the figure.
  • the ears slide in the groove 12 in known fashion as a result of the braking forces applied by a caliper piston (not illustrated).
  • the engagement between the ears 10 and the caliper groove 12 restricts the motion of the pads 4 to be in the radial direction illustrated by the arrow 14.
  • a retraction force is usually necessary to apply a retraction force to the pads to provide a gap between the pads 4 and the rotor 8 when the braking force is released to prevent drag on the rotor. It is also desirable to apply a force to the pads that will reduce the vibrations of the pad, or "rattle.”
  • a single spring is arranged to apply both a retraction force and a force that reduces rattle.
  • two S-shaped springs 6 are preferably applied between the opposed pads by engaging the ends of the springs in holes 16 in the backing plates of the pads. It will be appreciated that the springs apply tangential forces to the pads to urge the pad ears into the channel 12 and reduce rattle and also apply radial forces in the direction of the channel 12 to retract the pads upon release of braking force.
  • both tangential and radial forces by the springs 6 is the result of the transverse alignment of the springs with respect to the direction of the groove 12 in the caliper.
  • the holes 16 in opposed backing plates 8 are not aligned in the direction of movement of the backing plates, illustrated by arrow 14. Instead, the holes receiving a single spring are shifted in the tangential direction such that they lie on a line as shown at 18 in the figure.
  • the springs 6 are compressed such that the restoring forces applied to the backing plates by the springs 6 are applied in the direction of the line 18. Because these forces are transverse to the radial direction, they contain both radial and tangential components.
  • the tangential force applied by the springs to each baldng plate is the tangential component of the line 18 connecting the two holes in each respective pad, and the radial force is the radial component of the line.
  • Arrows 20 and 20' illustrate the tangential components
  • arrows 22 and 22' illustrate the radial components.
  • the radial distance between the pads in the rest position is shortened. This means that the angle of the line 18 connecting the holes 16 changes as the pads wear, and this changes the proportion of the force applied by the springs that is radial and tangential for springs such as those illustrated. As the pad lining wears, the spring must be able to account for the natural decrease in the radial force and the increase in the tangential force caused by a change in the relative positions of the holes 16. Applicants have found that a spring of known spring material having, for example, a diameter of 2mm, and in the S-shape is effective.
  • the S-shape of the spring as shown has been found advantageous because the curves can accommodate the changes.
  • other configurations including a N- shape or coiled shape are possible.
  • the holes 16 are angled to facilitate assembly of the springs to the backing plates.
  • Other configurations are possible, however.
  • the holes may extend in the direction of caliper movement, or a completely different attachment mechanism, such as a clip or other fastener, may be employed.
  • two springs in the same orientation are used.
  • the respective tangential and radial components of the two springs are collinear and add to provide increased forces.
  • Arrangements other than the symmetrical arrangement shown may have utility, however.
  • the element 6 has been referred to herein as a spring. Such is intended to refer to a variety of resilient elements that resiliently resist application of forces to and try to return to their original shape. While the springs are shown acting in compression, it is possible to arrange the springs to operate in tension.

Abstract

A disc brake uses retraction springs arranged in directions transverse to the direction of movement of the brake pads. The springs thus apply both tangential and radial forces to the brake pads to both retract the pads and to reduce rattle. In the preferred embodiment, the springs are S-shaped and attached to the pad backing plates by insertion of the ends of the springs into holes in the backing plates.

Description

SPRING FOR RETRACTING AND RETAINING A PAD IN A CAI-JPER TYPE DISC BRAKE ASSEMBLY
TECHNICAL FIELD
This invention relates to a caliper-type disc brake. In particular, the invention relates to a spring capable, both, of reducing rattle and retracting the brake pads.
BACKGROUND OF THE INVENTION
Pad rattle in a caliper disc brake assembly has been addressed by one of three methods. In one solution, the brake pads are secured to the brake piston or to the caliper body. In a second solution, the clearances between the pad and the support bracket are reduced or dampening material is placed in the clearances. Thirdly, a special pad clip has been provided to load the pad in a tangential direction.
The prior methods are not desirable because they all tend to lead to generation of larger disk thickness variation (DTN), for example, because of increased slide loads, increase in component cost, due to added complexity, and cause assembly and its service to be more difficult.
SUMMARY OF THE INVENTION
In accordance with the invention, a spring is installed between the opposed brake pads in such a manner that the spring applies to the pads a force that is directed in both the tangential and radial directions. (As used herein "tangential" refers to the direction transverse to the direction of caliper piston movement, and "radial" refers to the direction of caliper piston movement.) Preferably, each end of the spring engages a respective hole in the backing plate for a pad. The springs are shaped to apply tangential and radial forces to the pads and, the preferred embodiment uses two S- shaped springs. The tangential force applied by the springs according to the invention increase the slide load of the pad assemblies and the radial force retracts the pads away from the rotor during non-braking. These advantages are achieved by components no more complex than used with conventional springs and assembly and service are unaffected.
It is an object of this invention to provide an assembly for a disc brake caliper that reduces rattle.
It is a further object of this invention to provide a spring assembly for a disc brake caliper that both reduces rattle and applies retraction forces.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to the drawing figure, a disc brake is illustrated with rotor 2 and opposed disc brake pads 4 on either side thereof. The disc brake pads 4 are mounted on respective backing plates 8, which include ears 10 or other structure for engaging a groove 12 in caliper, which is only partially illustrated in the figure. The ears slide in the groove 12 in known fashion as a result of the braking forces applied by a caliper piston (not illustrated). The engagement between the ears 10 and the caliper groove 12 restricts the motion of the pads 4 to be in the radial direction illustrated by the arrow 14.
It is usually necessary to apply a retraction force to the pads to provide a gap between the pads 4 and the rotor 8 when the braking force is released to prevent drag on the rotor. It is also desirable to apply a force to the pads that will reduce the vibrations of the pad, or "rattle." In accordance with the invention, a single spring is arranged to apply both a retraction force and a force that reduces rattle.
As illustrated in the figure, two S-shaped springs 6 are preferably applied between the opposed pads by engaging the ends of the springs in holes 16 in the backing plates of the pads. It will be appreciated that the springs apply tangential forces to the pads to urge the pad ears into the channel 12 and reduce rattle and also apply radial forces in the direction of the channel 12 to retract the pads upon release of braking force.
The application of both tangential and radial forces by the springs 6 is the result of the transverse alignment of the springs with respect to the direction of the groove 12 in the caliper. Thus, in the preferred embodiment illustrated, the holes 16 in opposed backing plates 8 are not aligned in the direction of movement of the backing plates, illustrated by arrow 14. Instead, the holes receiving a single spring are shifted in the tangential direction such that they lie on a line as shown at 18 in the figure.
As the pads move inward in the radial direction during braking, the springs 6 are compressed such that the restoring forces applied to the backing plates by the springs 6 are applied in the direction of the line 18. Because these forces are transverse to the radial direction, they contain both radial and tangential components. The tangential force applied by the springs to each baldng plate is the tangential component of the line 18 connecting the two holes in each respective pad, and the radial force is the radial component of the line. Arrows 20 and 20' illustrate the tangential components, and arrows 22 and 22' illustrate the radial components. Thus, these holes must be located based on the required radial and tangential loads for adequately retracting the pads and eliminating rattle.
Also, as the pads wear, the radial distance between the pads in the rest position is shortened. This means that the angle of the line 18 connecting the holes 16 changes as the pads wear, and this changes the proportion of the force applied by the springs that is radial and tangential for springs such as those illustrated. As the pad lining wears, the spring must be able to account for the natural decrease in the radial force and the increase in the tangential force caused by a change in the relative positions of the holes 16. Applicants have found that a spring of known spring material having, for example, a diameter of 2mm, and in the S-shape is effective.
The S-shape of the spring as shown has been found advantageous because the curves can accommodate the changes. Clearly, other configurations, including a N- shape or coiled shape are possible. Also, the holes 16 are angled to facilitate assembly of the springs to the backing plates. Other configurations are possible, however. For example, the holes may extend in the direction of caliper movement, or a completely different attachment mechanism, such as a clip or other fastener, may be employed.
Preferably two springs in the same orientation are used. In this manner, the respective tangential and radial components of the two springs are collinear and add to provide increased forces. Arrangements other than the symmetrical arrangement shown may have utility, however.
It should be noted that the element 6 has been referred to herein as a spring. Such is intended to refer to a variety of resilient elements that resiliently resist application of forces to and try to return to their original shape. While the springs are shown acting in compression, it is possible to arrange the springs to operate in tension.
Modifications within the scope of the appended claims will be apparent to those of skill in the art.

Claims

We claim:
1. A method for reducing rattle in a disc brake assembly, comprising attaching a spring to a brake pad in such a manner that the spring applies a tangential force and a radial force to said brake pad.
2. A method according to claim 1 wherein there are two opposed brake pads and said spring is attached to each of said two opposed brake pads.
3. A method according to claim 1 wherein said spring is attached between said two opposed brake pads.
4. A method according to claim 3 wherein said spring is S-shaped.
5. A brake assembly comprising a rotor, a respective brake pad on each side of said rotor, and at least one spring attached to each of said brake pads to apply tangential and radial forces to said pads.
6. A brake assembly according to claim 5 wherein said spring is between said brake pads and is S-shaped.
7. A brake assembly according to claim 6 wherein each of said brake pads is mounted to a respective backing plate, and each backing plate has at least one hole therein for receiving an end of said spring, each hole having an axis oriented transverse to the direction of movement of said brake pads.
8. A brake assembly according to claim 5 wherein said brake pads move in a first direction during braking and said spring is arranged to apply a force to said pads in a second direction transverse to said first direction.
9. In a disc brake assembly of the type having two brake pads carried by a caliper for movement in a first direction and a spring placed between said brake pads for returning said brake pads to a rest position, the improvement wherein said spring is arranged between said brake pads to apply a force in a direction transverse to said first direction.
10. The disc brake assembly according to claim 9 wherein said spring is S-shaped.
11. The disc brake assembly according to claim 10 wherein there are two of said springs.
12. The disc brake assembly according to claim 10 wherein each of said brake pads is carried by a backing plate, and each of said backing plates has a hole therein to receive an end of a said spring.
PCT/US2001/027775 2000-10-18 2001-10-18 Spring for retracting and retaining a pad in a caliper type disc brake assembly WO2002033282A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP01979238A EP1336055A4 (en) 2000-10-18 2001-10-18 Spring for retracting and retaining a pad in a caliper type disc brake assembly
AU2002211223A AU2002211223A1 (en) 2000-10-18 2001-10-18 Spring for retracting and retaining a pad in a caliper type disc brake assembly
JP2002536233A JP2004511738A (en) 2000-10-18 2001-10-18 Springs for pad retraction and retention in caliper-type disc brake assemblies

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US24098800P 2000-10-18 2000-10-18
US60/240,988 2000-10-18

Publications (1)

Publication Number Publication Date
WO2002033282A1 true WO2002033282A1 (en) 2002-04-25

Family

ID=22908752

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/027775 WO2002033282A1 (en) 2000-10-18 2001-10-18 Spring for retracting and retaining a pad in a caliper type disc brake assembly

Country Status (4)

Country Link
EP (1) EP1336055A4 (en)
JP (1) JP2004511738A (en)
AU (1) AU2002211223A1 (en)
WO (1) WO2002033282A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800020527A1 (en) * 2018-12-20 2020-06-20 Freni Brembo Spa ASSEMBLY OF PADS-SPRING FOR DISC BRAKE
WO2020129012A1 (en) * 2018-12-20 2020-06-25 Freni Brembo S.P.A. Assembly of at least two brake pads and at least one spring
IT201900023940A1 (en) 2019-12-13 2021-06-13 Freni Brembo Spa Assembly of at least two brake pads and at least one spring

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491204A (en) * 1981-03-04 1985-01-01 Fag Kugelfischer Georg Schafer & Co. Disk brake with return, guide, and pad-thickness sensor spring
GB2178807A (en) * 1985-08-02 1987-02-18 Automotive Products Plc A disk brake caliper assembly
US4669583A (en) * 1985-01-23 1987-06-02 Bendix France Disc brake with sliding calliper
US5069313A (en) * 1989-01-23 1991-12-03 Nisshinbo Industries, Inc. Device for preventing dislodgment of disc brake pads
US5069314A (en) * 1989-06-07 1991-12-03 Lucas Industries Public Limited Company Spot type disc brake including an improved hold down spring
US5310024A (en) * 1992-03-27 1994-05-10 Tokico Ltd. Disk brake return spring
US5330035A (en) * 1989-11-24 1994-07-19 Alfred Teves Gmbh Holding down spring for spot-type disc brakes and associated housing and brake shoes
US5472067A (en) * 1992-06-08 1995-12-05 Nisshinbo Industries, Inc. Supporting device for disk brake friction pads
US5549181A (en) * 1994-09-13 1996-08-27 Kelsey-Hayes Company Brake shoe retractor clip for disc brake assembly
US5829555A (en) * 1996-03-06 1998-11-03 Aisin Seiki Kabushiki Kaisha Disc brake caliper assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2931071A1 (en) * 1979-07-31 1981-03-12 Alfred Teves Gmbh, 6000 Frankfurt Disc brake with pads slidable on rods in caliper - has single wire spring, loading pads away from disc in radially inward direction
CA1304701C (en) * 1986-04-29 1992-07-07 Allied Corporation Anti-rattle spring for a disc brake
DE4332713A1 (en) * 1993-09-25 1995-03-30 Teves Gmbh Alfred Spring arrangement for fixed-caliper disc brakes

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491204A (en) * 1981-03-04 1985-01-01 Fag Kugelfischer Georg Schafer & Co. Disk brake with return, guide, and pad-thickness sensor spring
US4669583A (en) * 1985-01-23 1987-06-02 Bendix France Disc brake with sliding calliper
GB2178807A (en) * 1985-08-02 1987-02-18 Automotive Products Plc A disk brake caliper assembly
US5069313A (en) * 1989-01-23 1991-12-03 Nisshinbo Industries, Inc. Device for preventing dislodgment of disc brake pads
US5069314A (en) * 1989-06-07 1991-12-03 Lucas Industries Public Limited Company Spot type disc brake including an improved hold down spring
US5330035A (en) * 1989-11-24 1994-07-19 Alfred Teves Gmbh Holding down spring for spot-type disc brakes and associated housing and brake shoes
US5310024A (en) * 1992-03-27 1994-05-10 Tokico Ltd. Disk brake return spring
US5472067A (en) * 1992-06-08 1995-12-05 Nisshinbo Industries, Inc. Supporting device for disk brake friction pads
US5549181A (en) * 1994-09-13 1996-08-27 Kelsey-Hayes Company Brake shoe retractor clip for disc brake assembly
US5829555A (en) * 1996-03-06 1998-11-03 Aisin Seiki Kabushiki Kaisha Disc brake caliper assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1336055A4 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800020527A1 (en) * 2018-12-20 2020-06-20 Freni Brembo Spa ASSEMBLY OF PADS-SPRING FOR DISC BRAKE
WO2020129012A1 (en) * 2018-12-20 2020-06-25 Freni Brembo S.P.A. Assembly of at least two brake pads and at least one spring
CN113195920A (en) * 2018-12-20 2021-07-30 乐姆宝公开有限公司 Assembly of at least two brake linings and at least one spring
CN113195920B (en) * 2018-12-20 2023-08-11 乐姆宝公开有限公司 Assembly of at least two brake pads and at least one spring
US11852207B2 (en) 2018-12-20 2023-12-26 Brembo S.P.A. Assembly of at least two brake pads and at least one spring
IT201900023940A1 (en) 2019-12-13 2021-06-13 Freni Brembo Spa Assembly of at least two brake pads and at least one spring

Also Published As

Publication number Publication date
EP1336055A4 (en) 2005-01-12
JP2004511738A (en) 2004-04-15
EP1336055A1 (en) 2003-08-20
AU2002211223A1 (en) 2002-04-29

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