WO1996030668A1 - Backplate for friction material - Google Patents

Backplate for friction material Download PDF

Info

Publication number
WO1996030668A1
WO1996030668A1 PCT/GB1996/000588 GB9600588W WO9630668A1 WO 1996030668 A1 WO1996030668 A1 WO 1996030668A1 GB 9600588 W GB9600588 W GB 9600588W WO 9630668 A1 WO9630668 A1 WO 9630668A1
Authority
WO
WIPO (PCT)
Prior art keywords
backplate
friction material
projections
remainder
distributed
Prior art date
Application number
PCT/GB1996/000588
Other languages
French (fr)
Inventor
Andrew Timothy Cole
George Michael Coldrick
John David Holme
Original Assignee
T & N Technology Limited
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 T & N Technology Limited filed Critical T & N Technology Limited
Publication of WO1996030668A1 publication Critical patent/WO1996030668A1/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
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/04—Attachment of linings
    • F16D69/0408—Attachment of linings specially adapted for plane linings
    • 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
    • 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
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/04—Attachment of linings
    • F16D2069/0425—Attachment methods or devices
    • F16D2069/0441—Mechanical interlocking, e.g. roughened lining carrier, mating profiles on friction material and lining carrier
    • 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
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/04—Attachment of linings
    • F16D2069/0425—Attachment methods or devices
    • F16D2069/045—Bonding
    • F16D2069/0466—Bonding chemical, e.g. using adhesives, vulcanising
    • 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
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/04—Attachment of linings
    • F16D2069/0425—Attachment methods or devices
    • F16D2069/0483—Lining or lining carrier material shaped in situ

Definitions

  • This invention is concerned with backplates for friction material.
  • a conventional brake pad for use, for example, in a disc brake of a vehicle comprises a pad of friction material mounted on a backplate.
  • the backplate is conventionally made of rolled steel and defines a small number of holes (spigot holes) which can be entered by friction material to key the material to the backplate.
  • the backplate is placed across a cavity containing particulate friction material and curable resin and the particles are pressed into a pad against the backplate.
  • the resin is subsequently cured to give the pad strength.
  • the material enters the spigot holes so that, in service, the material in these holes resists the friction material being sheared away from the backplate.
  • the invention provides a backplate for friction material which is made of cast metal, the backplate having a generally planar friction material-receiving surface, characterised in that the backplate comprises a plurality of projections distributed across and projecting from the friction material-receiving surface, the projections being cast integrally with the remainder of the backplate, each projection tapering in a direction away from the remainder of the backplate.
  • the projections can be easily cast and project into the friction material forming a good key. This makes the conventional spigot holes unnecessary improving resistance to water penetration and also improving the homogeneity of the friction material which does not have to flow into the spigot holes. Furthermore, the tapering of the projections is found to reduce the tendency of the friction material to delaminate from the backplate by deflecting cracks from the plane of the interface between backplate and the friction material. This advantage would not be obtained by providing, for example, indentations in the backplate.
  • the backplate is, preferably, cast from iron but aluminium and other metals are possible.
  • the projections are distributed in a regular pattern, eg a rectilinear pattern, over the area of the backplate occupied by the friction material.
  • the projections project by 1mm to 3mm from the remainder of the backplate.
  • the projections may project 2mm.
  • each projection occupies an area of 2 to 8 square millimetres.
  • the projections may be in the form of pyramids or may be conical or frustoconical.
  • the height of each projection may be substantially equal to the distance through its base so that it has its sides inclined at approximately 67 degrees.
  • the projections may be distributed at between 4 and 9 to the square centimetre.
  • the backplate may be given an anti-corrosion treatment before the friction material is applied thereto.
  • Such treatment may comprise dipping the backplate in a phosphate bath.
  • Figure 1 is a perspective view of the illustrative backplate
  • Figure 2 is a side elevational view of the illustrative backplate.
  • the illustrative backplate 10 is for frictional material and is made by a conventional casting technique from cast iron.
  • the backplate 10 is of conventional form except that it comprises a plurality of projections 12 distributed across a generally planar friction material- receiving surface 14 of the backplate 10.
  • the projections 12 are cast integrally with the remainder of the backplate and are distributed across the surface 14 in a regular rectilinear pattern.
  • Each projection 12 is in the form of a pyramid which has a square base of 2mm on a side and is 2mm high. Thus, each projection 12 tapers in a direction away from the remainder of the backplate 10 and projects into the friction material by 2mm. Each projection occupies an area of 4 square millimetres.
  • the projections 12 are spaced 2mm apart so that there are on average approximately 6.5 projections per square centimetre.
  • the backplate 10 was used in a conventional pressing and curing process to form a brake pad for a disc brake.
  • the friction material was found to be well keyed to the backplate 10 and required more force to shear it off the backplate than was required for a conventional rolled steel backplate.

Abstract

A backplate (10) for friction material is made of cast metal and comprises a plurality of projections (12) cast integrally therewith. The projections (12) are distributed across a friction material-receiving surface (14) of the backplate (10) and each projection tapers in a direction away from the remainder of the backplate.

Description

BACKPLATE FOR FRICTION MATERIAL
This invention is concerned with backplates for friction material.
A conventional brake pad for use, for example, in a disc brake of a vehicle comprises a pad of friction material mounted on a backplate. The backplate is conventionally made of rolled steel and defines a small number of holes (spigot holes) which can be entered by friction material to key the material to the backplate. The backplate is placed across a cavity containing particulate friction material and curable resin and the particles are pressed into a pad against the backplate. The resin is subsequently cured to give the pad strength. During the pressing operation, the material enters the spigot holes so that, in service, the material in these holes resists the friction material being sheared away from the backplate.
Various attempts have been made to improve the keying of the friction material to the backplate. For example, it is known to apply metal powder to the backplate and sinter the powder to form a porous layer into the interstices of which the friction material can enter. Another known possibility is to weld a piece of expanded metal mesh to the backplate so that the mesh becomes embedded in the friction material. These possibilities, although they improve the keying, are complex to manufacture.
DE 26 29 793 A describes a backplate which is made from cast iron instead of rolled steel. One advantage claimed for the use of this material is that the friction material adheres well to the rough cast surface. However, this publication does not suggest that the keying can be improved by casting any features into the backplate.
It is an object of the present invention to provide a backplate with improved keying which is not complex to manufacture.
The invention provides a backplate for friction material which is made of cast metal, the backplate having a generally planar friction material-receiving surface, characterised in that the backplate comprises a plurality of projections distributed across and projecting from the friction material-receiving surface, the projections being cast integrally with the remainder of the backplate, each projection tapering in a direction away from the remainder of the backplate.
In a backplate according to the invention, the projections can be easily cast and project into the friction material forming a good key. This makes the conventional spigot holes unnecessary improving resistance to water penetration and also improving the homogeneity of the friction material which does not have to flow into the spigot holes. Furthermore, the tapering of the projections is found to reduce the tendency of the friction material to delaminate from the backplate by deflecting cracks from the plane of the interface between backplate and the friction material. This advantage would not be obtained by providing, for example, indentations in the backplate. The backplate is, preferably, cast from iron but aluminium and other metals are possible. Preferably, the projections are distributed in a regular pattern, eg a rectilinear pattern, over the area of the backplate occupied by the friction material.
It is found to be advantageous if the projections project by 1mm to 3mm from the remainder of the backplate. For example, the projections may project 2mm.
Preferably, each projection occupies an area of 2 to 8 square millimetres. For example, the projections may be in the form of pyramids or may be conical or frustoconical. For example, the height of each projection may be substantially equal to the distance through its base so that it has its sides inclined at approximately 67 degrees.
The projections may be distributed at between 4 and 9 to the square centimetre.
The backplate may be given an anti-corrosion treatment before the friction material is applied thereto. Such treatment may comprise dipping the backplate in a phosphate bath.
There now follows a detailed description, to be read with reference the accompanying drawings, of a backplate which is illustrative of the invention.
In the drawings:
Figure 1 is a perspective view of the illustrative backplate; and
Figure 2 is a side elevational view of the illustrative backplate.
The illustrative backplate 10 is for frictional material and is made by a conventional casting technique from cast iron. The backplate 10 is of conventional form except that it comprises a plurality of projections 12 distributed across a generally planar friction material- receiving surface 14 of the backplate 10.
The projections 12 are cast integrally with the remainder of the backplate and are distributed across the surface 14 in a regular rectilinear pattern.
Each projection 12 is in the form of a pyramid which has a square base of 2mm on a side and is 2mm high. Thus, each projection 12 tapers in a direction away from the remainder of the backplate 10 and projects into the friction material by 2mm. Each projection occupies an area of 4 square millimetres.
The projections 12 are spaced 2mm apart so that there are on average approximately 6.5 projections per square centimetre.
The backplate 10 was used in a conventional pressing and curing process to form a brake pad for a disc brake. The friction material was found to be well keyed to the backplate 10 and required more force to shear it off the backplate than was required for a conventional rolled steel backplate.

Claims

A backplate (10) for friction material which is made of cast metal, the backplate having a generally planar friction material-receiving surface (14) , characterised in that the backplate comprises a plurality of projections (12) distributed across and projecting from the friction material-receiving surface, the projections being cast integrally with the remainder of the backplate, each projection tapering in a direction away from the remainder of the backplate.
A backplate according to claim 1, characterised in that the projections (12) are distributed in a regular pattern.
A backplate according to either one of claims 1 and 2, characterised in that the projections (12) project by 1 to 3mm from the remainder of the backplate.
A backplate according to any one of claims 1 to 3, characterised in that each projection (12) occupies an area of 2 to 8 square millimetres.
A backplate according to any one of claims 1 to 4, characterised in that the projections (12) are in the form of pyramids.
A backplate according to any one of claims 1 to 4, characterised in that the projections (12) are conical or frustoconical.
A backplate according to any one of claims 1 to 6, characterised in that the projections (12) are distributed at between 4 and 9 to the square centimetre.
PCT/GB1996/000588 1995-03-24 1996-03-15 Backplate for friction material WO1996030668A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9506032.3 1995-03-24
GBGB9506032.3A GB9506032D0 (en) 1995-03-24 1995-03-24 Backplate for friction material

Publications (1)

Publication Number Publication Date
WO1996030668A1 true WO1996030668A1 (en) 1996-10-03

Family

ID=10771818

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/000588 WO1996030668A1 (en) 1995-03-24 1996-03-15 Backplate for friction material

Country Status (2)

Country Link
GB (2) GB9506032D0 (en)
WO (1) WO1996030668A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105068298A (en) * 2015-06-23 2015-11-18 深圳市华星光电技术有限公司 Viewing angle enlarging film and wide-viewing-angle thin film transistor-liquid crystal display (TFT-LCD) comprising the same
CN111435205A (en) * 2019-06-28 2020-07-21 宁波激智科技股份有限公司 Novel rectangular pyramid brightness enhancement film and preparation method thereof

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19650026C2 (en) * 1996-12-03 2003-04-10 Ruetgers Automotive Ag Process for regenerating brake pads
CA2262214A1 (en) 1999-02-18 2000-08-18 Ray Arbesman Disc brake backing plate and method and apparatus of manufacturing same
US6431331B1 (en) 2000-02-18 2002-08-13 Ray Arbesman Brake plate and method and apparatus for manufacturing same
US7222701B2 (en) 2003-06-02 2007-05-29 Capital Tool & Design Limited Backing plate with friction material retention members and method and apparatus for manufacturing same
DE10350725B4 (en) * 2003-10-30 2006-10-12 Tmd Friction Services Gmbh Pad carrier plate and method for its production
DE102006004550B4 (en) 2006-02-01 2016-12-22 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Brake pad for a disc brake
DE102009034858A1 (en) * 2009-07-27 2011-02-03 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Brake pad for a disc brake
CA2760923C (en) 2011-12-06 2014-03-11 Ray Arbesman Apparatus for texturing the surface of a brake plate

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1160503A (en) * 1967-01-11 1969-08-06 Bergische Stahlindustrie Improvements in Brake Shoes.
GB2071795A (en) * 1980-02-12 1981-09-23 Valeo Friction element such as a brake pad
EP0084591A1 (en) * 1982-01-22 1983-08-03 Jurid Werke GmbH Lining, especially for disc brake pads, drum brake shoes, rail vehicle brake blocks and friction discs or the like, and method of manufacturing the same
EP0163030A2 (en) * 1984-06-01 1985-12-04 ALFRED TEVES GmbH Automatic machine and process for making brake linings
EP0336465A1 (en) * 1988-03-31 1989-10-11 So.C.I.Mi Societa Costruzioni Industriali Milano S.P.A. Friction shoe for brakes
GB2245667A (en) * 1990-06-28 1992-01-08 Ferodo Ltd Disc brake pad backplate
US5123514A (en) * 1991-09-20 1992-06-23 Echlin Inc. Clutch or brake system for a heavy duty vehicle

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
GB694905A (en) * 1950-05-08 1953-07-29 Pompes Noel Soc Brake-drum
EP0267561A1 (en) * 1986-11-14 1988-05-18 ZWN ZAHNRADWERK NEUENSTEIN GMBH & CO. Method of manufacturing synchroniser parts for motor vehicle transmissions
GB9515926D0 (en) * 1995-08-03 1995-10-04 T & N Technology Ltd Manufacture of brake pads
DE19532019C1 (en) * 1995-08-31 1997-02-13 Ae Goetze Gmbh Carrier plate for friction linings

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1160503A (en) * 1967-01-11 1969-08-06 Bergische Stahlindustrie Improvements in Brake Shoes.
GB2071795A (en) * 1980-02-12 1981-09-23 Valeo Friction element such as a brake pad
EP0084591A1 (en) * 1982-01-22 1983-08-03 Jurid Werke GmbH Lining, especially for disc brake pads, drum brake shoes, rail vehicle brake blocks and friction discs or the like, and method of manufacturing the same
EP0163030A2 (en) * 1984-06-01 1985-12-04 ALFRED TEVES GmbH Automatic machine and process for making brake linings
EP0336465A1 (en) * 1988-03-31 1989-10-11 So.C.I.Mi Societa Costruzioni Industriali Milano S.P.A. Friction shoe for brakes
GB2245667A (en) * 1990-06-28 1992-01-08 Ferodo Ltd Disc brake pad backplate
US5123514A (en) * 1991-09-20 1992-06-23 Echlin Inc. Clutch or brake system for a heavy duty vehicle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105068298A (en) * 2015-06-23 2015-11-18 深圳市华星光电技术有限公司 Viewing angle enlarging film and wide-viewing-angle thin film transistor-liquid crystal display (TFT-LCD) comprising the same
WO2016206261A1 (en) * 2015-06-23 2016-12-29 深圳市华星光电技术有限公司 Viewing angle enlarging film and wide viewing angle thin film transistor liquid crystal display device comprising the same
US9933648B2 (en) 2015-06-23 2018-04-03 Shenzhen China Star Optoelectronics Technology Co., Ltd. Wide viewing film and wide viewing TFT-LCD having the same
CN111435205A (en) * 2019-06-28 2020-07-21 宁波激智科技股份有限公司 Novel rectangular pyramid brightness enhancement film and preparation method thereof

Also Published As

Publication number Publication date
GB2299382A (en) 1996-10-02
GB9506032D0 (en) 1995-05-10
GB9604477D0 (en) 1996-05-01
GB2299382B (en) 1998-09-16

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