GB2376276A - Brake friction material having coloured regions indicating wear - Google Patents
Brake friction material having coloured regions indicating wear Download PDFInfo
- Publication number
- GB2376276A GB2376276A GB0114137A GB0114137A GB2376276A GB 2376276 A GB2376276 A GB 2376276A GB 0114137 A GB0114137 A GB 0114137A GB 0114137 A GB0114137 A GB 0114137A GB 2376276 A GB2376276 A GB 2376276A
- Authority
- GB
- United Kingdom
- Prior art keywords
- friction material
- wear
- friction
- region
- coloured
- 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.)
- Withdrawn
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
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D66/02—Apparatus for indicating wear
-
- 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
- F16D2069/005—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces having a layered structure
Abstract
A friction material for a vehicle braking system has regions of different colours so as to provide a visual indication of the degree of wear. Region 106 is coloured yellow while region 107 is coloured red. Some dust produced is deposited on surrounding regions of the vehicle, changes in the colour of the dust indicating the wear level. A disk brake pad incorporating such material is described, but the material may be applied to drum brakes.
Description
<Desc/Clms Page number 1>
WEAR-INDICATING FRICTION MATERIALS The present invention relates to a means for indicating when brake friction materials are wearing beyond acceptable limits and more specifically to means for indicating when vehicle brake friction materials are wearing excessively Vehicle and machinery braking systems include members which are faced with materials, called friction materials, which have high coefficients of friction and which are forced against moving members the motions of which are to be arrested The braking forces generated and the resistance to fade are direct functions of the thickness of the friction materials used and undetected excessive wear of vehicle brake pads and shoes is a cause of accidents It is known to provide vehicle brake pads with embedded metal contacts which, when exposed due to the wear of the brake pads, make electrical contact with the associated brake disks and cause a warning light on the dashboard of the vehicle concerned to be illuminated.
However, such systems are only fitted to more sophisticated cars. Also, such wearindicating systems are not reliable because of failure of the electrical connections to the contacts embedded in the brake pads Another disadvantage of such brake wear indicating systems is that the warning of brake pad wear is only given to the occupants of the vehicle concerned It is an object of the present invention to provide an improved means for indicating when the wear of brake friction materials is excessive According to the present invention in one aspect there is provided a body of friction material for use in a braking system wherein the colour of the friction material is graded across the thickness of the body of friction material According to the present invention in a second aspect there is provided a component for use in a braking system, comprising a backing member to which is attached a layer
<Desc/Clms Page number 2>
of friction material wherein the colour of the friction material is graded across the layer of friction material In use, as the friction material is abraded duct is created which is deposited on the surfaces surrounding the brake pads or shoes This is particularly so in the case of motor vehicle disk brake systems where the dust abraded from the brake pads causes black deposits on the vehicle wheels, which are readily apparent to an onlooker In the case of brake pads embodying the present invention the colour of this dust changes as wear of the friction material progresses and this colour change provides a visible indication of the wear of the brake pads without the need to inspect the brake pads themselves and which is readily apparent to anyone in the vicinity of the vehicle, whether it be the driver, a would-be passenger, maintenance mechanic or other interested party Suitably the friction material could be coloured so that yellow dust is produced when wear of the friction material has proceeded to a point where the performance of the friction material is beginning to be degraded and a red dust is produced when the wear of the friction material has proceeded to the point where the performance of the friction material is seriously degraded The invention will now be described, by way of example, with reference to the accompanying drawing which is a perspective view of a disk brake pad embodying the invention Referring to the drawing, a motor vehicle disk brake pad 100 consists of a steel backing plate 101 the shape of which is a part of a sector of a circle the diameter of which is approximately the same as that of the brake disk with which it is to be used Projecting from each of the radial edges 102 of the backing member 101 are locating tongues 103, only one of which is visible in the drawing Bonded to the backing member 101 is a block 104 of friction material The block of friction material also is sectorial in shape but is smaller than the backing member 103 The block of friction material 104 has three regions, 105, 106 107 of different colours The initially
<Desc/Clms Page number 3>
exposed region 105 is the colour of the original friction material, the region 106 is coloured yellow and the region 107 is coloured red The yellow region 106 of the block of friction material 104 begins at the position where the performance of the block 104 of friction material is beginning to be impaired because of the wear of the block 104 of friction material and the red region 107 of the block 104 of friction material begins at a position where the performance of the block 104 of friction material is seriously impaired because of the wear of the block 104 of friction material.
Thus, as the block 104 of friction material wears, the dust produced changes from black to yellow to red as wear proceeds The dust is deposited on surrounding regions of the vehicle's chassis and the vehicle's wheels where it is readily apparent to an onlooker, giving an immediately apparent indication of the state of wear of the vehicle's brakes The invention has been described in relation to vehicular disk brake pads It is equally applicable to drum brake shoes and to friction brakes for machinery
Claims (1)
1. A body of friction materia ! fb) use in a braking system, whercin the colour of iciion materi to I the friction materials is graded across the thickness of the body of friction material 2 A body of friction material according to Claim 1 wherein the body of friction material has three different coloured regions, the transition from the first region to the second region occurs when the thickness of the body of friction material has been reduced to a point where the performance of the friction material has been reduced appreciably and the transition from the second coloured region to the third coloured region occurs when the thickness of the friction material has been reduced to the point where the performance of the friction material has been reduced significantly 3. A component for use in a braking system comprising a body of friction material according to Claim I or Claim 2 attached to a backing member, 4. A component according to Claim 3 adapted for use with a disk brake 5 A component according to Claim 3 adapted for use with a drum brake 6. A friction material for use in a braking system substantially as hereinbefore described 7. A component for use in a braking system substantially as hereinbefore described and with reference to the accompanying drawing
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0114137A GB2376276A (en) | 2001-06-09 | 2001-06-09 | Brake friction material having coloured regions indicating wear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0114137A GB2376276A (en) | 2001-06-09 | 2001-06-09 | Brake friction material having coloured regions indicating wear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0114137D0 GB0114137D0 (en) | 2001-08-01 |
| GB2376276A true GB2376276A (en) | 2002-12-11 |
Family
ID=9916301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0114137A Withdrawn GB2376276A (en) | 2001-06-09 | 2001-06-09 | Brake friction material having coloured regions indicating wear |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2376276A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1666756A1 (en) | 2004-12-03 | 2006-06-07 | Renault | Visual check of the wear state of a brake drum |
| EP1683987A1 (en) * | 2005-01-24 | 2006-07-26 | International Truck Intellectual Property Company, LLC. | Brake lining wear indicator |
| US7424936B2 (en) * | 2005-11-17 | 2008-09-16 | Mcclellan William Thomas | Brake pad with wear indicator |
| FR2927391A1 (en) * | 2008-02-12 | 2009-08-14 | Peugeot Citroen Automobiles Sa | Brake disc wear visual indication device for disc brake of motor vehicle, has pin including end part whose color is different from respective face of disc and is visible from exterior, when face attains authorized maximum wear depth |
| AU2011100237B4 (en) * | 2011-03-03 | 2012-05-24 | Bradken Resources Pty Ltd | Method, System and Apparatus for Indicating Wear |
| US20120285775A1 (en) * | 2011-05-12 | 2012-11-15 | Mcgee Robert | Brake pad wear indicator |
| WO2014096473A1 (en) * | 2012-12-19 | 2014-06-26 | Pereira Rodriguez, Edelmiro Pedro | Friction element for brake mechanisms, with a wear indicator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2047827A (en) * | 1979-04-25 | 1980-12-03 | Stoker D | Wear indicating |
| DE3027578A1 (en) * | 1980-07-21 | 1982-02-25 | Leo 5600 Wuppertal Bogdoll | Wear indicator for vehicle disc brake - has colouring agent mixed with inner part of brake pad material for visual indication |
| JPH04113038A (en) * | 1990-09-03 | 1992-04-14 | Mitsubishi Electric Corp | Brake device |
| EP0693635A1 (en) * | 1994-07-19 | 1996-01-24 | Nisshinbo Industries, Inc. | Friction pad |
-
2001
- 2001-06-09 GB GB0114137A patent/GB2376276A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2047827A (en) * | 1979-04-25 | 1980-12-03 | Stoker D | Wear indicating |
| DE3027578A1 (en) * | 1980-07-21 | 1982-02-25 | Leo 5600 Wuppertal Bogdoll | Wear indicator for vehicle disc brake - has colouring agent mixed with inner part of brake pad material for visual indication |
| JPH04113038A (en) * | 1990-09-03 | 1992-04-14 | Mitsubishi Electric Corp | Brake device |
| EP0693635A1 (en) * | 1994-07-19 | 1996-01-24 | Nisshinbo Industries, Inc. | Friction pad |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1666756A1 (en) | 2004-12-03 | 2006-06-07 | Renault | Visual check of the wear state of a brake drum |
| EP1683987A1 (en) * | 2005-01-24 | 2006-07-26 | International Truck Intellectual Property Company, LLC. | Brake lining wear indicator |
| US7424936B2 (en) * | 2005-11-17 | 2008-09-16 | Mcclellan William Thomas | Brake pad with wear indicator |
| FR2927391A1 (en) * | 2008-02-12 | 2009-08-14 | Peugeot Citroen Automobiles Sa | Brake disc wear visual indication device for disc brake of motor vehicle, has pin including end part whose color is different from respective face of disc and is visible from exterior, when face attains authorized maximum wear depth |
| AU2011100237B4 (en) * | 2011-03-03 | 2012-05-24 | Bradken Resources Pty Ltd | Method, System and Apparatus for Indicating Wear |
| US20120285775A1 (en) * | 2011-05-12 | 2012-11-15 | Mcgee Robert | Brake pad wear indicator |
| WO2014096473A1 (en) * | 2012-12-19 | 2014-06-26 | Pereira Rodriguez, Edelmiro Pedro | Friction element for brake mechanisms, with a wear indicator |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0114137D0 (en) | 2001-08-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |