WO1997025549A2 - Multi-layer brake element with enhanced thermal insulation - Google Patents
Multi-layer brake element with enhanced thermal insulation Download PDFInfo
- Publication number
- WO1997025549A2 WO1997025549A2 PCT/GB1997/000075 GB9700075W WO9725549A2 WO 1997025549 A2 WO1997025549 A2 WO 1997025549A2 GB 9700075 W GB9700075 W GB 9700075W WO 9725549 A2 WO9725549 A2 WO 9725549A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- brake element
- elastomeric material
- friction material
- range
- Prior art date
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
-
- 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
-
- 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
- F16D2069/004—Profiled friction surfaces, e.g. grooves, dimples
-
- 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
- F16D2069/006—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces having a layered structure comprising a heat-insulating layer
-
- 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
- F16D2069/007—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces having a layered structure comprising a resilient layer
Definitions
- This invention relates to brake elements particularly useful for railway braking applications.
- a brake element comprising a friction material lining and a backing plate, together with a relatively soft layer of elastomeric material being interposed between said friction material lining and said backing plate, is characterised in that a further layer of elastomeric material of relatively low thermal conductivity and relatively high resistance to thermal degradation is interposed between the friction material lining and the relatively soft layer of elastomeric material.
- the further layer is preferably semi-conformable relative to the soft underlayer. That is to say it is more conformable than the friction layer, but less conformable than the underlayer.
- the further layer is preferably formulated to have a thermal conductivity on the order of only 8-12% of that of the friction layer. This will normally be greater than that of the relatively soft elastomeric material layer. All three layers are preferably formulated so as to avoid or at least minimise interface shear stresses due to thermal expansion developed in response to the temperatures attained in braking service. This may be done by appropriate choice of materials such as fillers and/or metallic ingredients for the two elastomeric material layers. For practical purposes it has proved sufficient to formulate the elastomer material layers for a thermal expansion of the order of 0.01mm to 0.05mm, over a temperature range of, say, ambient to 200°C and determined in accordance with the test method described below, using a sample length of 8mm.
- the longitudinal and/or transverse grooving of WO95/07418 is employed, but with the grooves extending through both the friction material layer and through the further elastomeric material layer to the interface between the latter and the relatively soft elastomeric material layer. This has been found to enhance the conformability of the friction lining in use against the confronting moving surface of a brake disk.
- the friction material lining has a modulus of elasticity in the range 1000-2000 N/mm 2
- the further layer has a modulus of elasticity in the range 300-800 N/mm 2
- the relatively soft elastomeric material layer has a modulus of elasticity in the range 50-100 N/mm 2 , as determined for temperatures in the range from ambient to 200 ⁇ C.
- modulus of elasticity is measured by applying a load of 312.5 N to a material sample of 25mm cube seven times, at a loading rate of 2mm/minute. The deflection is measured by an LVDT transducer and the modulus is calculated as maximum stress divided by total strain, (otherwise known as the secant modulus) . This test can be carried out at different temperatures if desired; the figures quoted herein are for the seventh loading cycle.
- FIG. 1 a schematic view of a disk brake pad constructed in accordance with the present invention.
- the drawing shows a metal backplate 2 and a friction layer 3.
- a relatively soft elastomeric material layer 5 is in contact with the backplate and is disposed between the latter and the friction material layer 3.
- a further layer of elastomeric material 4 is interposed between the layers 3 and 5.
- Transverse and longitudinal grooves 6, 7 are provided extending from the working face 1 of the friction material to the interface between the layers 4 and 5.
- the relatively soft elastomeric material layer 5 was formulated to exhibit a Rockwell penetration hardness at least twice that of the friction material.
- the further layer of elastomeric material 4 was formulated to have a thermal conductivity not much greater than that of the soft elastomeric material layer 5, but very much lower than that of the friction material layer 3. It was also formulated to have high resistance to thermal degradation.
- thermal conductivity was determined by testing a standard disk of material 1.6 inches (40.6mm) in diameter, 0.1875 inches (5mm) thick in the conventional Lees' conductivity apparatus. After measuring the thickness, the faces of the sample were coated with a thermally conductive paste prior to assembling three copper disks and two samples as a stack which was heated from one end over a period of at least six hours whilst monitoring the copper disk temperatures, and prior to calculating the conductivity, in the usual way.
- a disk brake pad as just described exhibited good service life in terms of wear rate and absence of "hot spots” due to uneven pressure. It was highly conformable to an associated brake disk in use and it had excellent resistance to thermal damage, even under severe operating temperatures.
- the thermal expansion figures quoted in 2 above were determined by heating a sample 5mm by 8mm square and 5mm thick at controlled rate to 200°C. The change in the 8mm dimension was measured by a probe. The sample was then cooled at the same rate and the contraction measured. The test was repeated with a second sample, to determine an average value. The rate of heating/cooling was 5 ⁇ C per minute.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9525000A JP2000503099A (en) | 1996-01-11 | 1997-01-13 | Multi-layer brake element with high thermal insulation |
US09/101,586 US6142263A (en) | 1996-01-11 | 1997-01-13 | Multi-layer brake element with enhanced thermal insulation |
DE69714407T DE69714407T2 (en) | 1996-01-11 | 1997-01-13 | MULTILAYER BRAKE ELEMENT WITH IMPROVED THERMAL INSULATION |
EP97900324A EP0873480B1 (en) | 1996-01-11 | 1997-01-13 | Multi-layer brake element with enhanced thermal insulation |
AU13910/97A AU714298B2 (en) | 1996-01-11 | 1997-01-13 | Multi-layer brake element with enhanced thermal insulation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9600561.6 | 1996-01-11 | ||
GB9600561A GB2309057B (en) | 1996-01-11 | 1996-01-11 | Improved brake elements |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1997025549A2 true WO1997025549A2 (en) | 1997-07-17 |
WO1997025549A3 WO1997025549A3 (en) | 1997-09-18 |
Family
ID=10786906
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1997/000075 WO1997025549A2 (en) | 1996-01-11 | 1997-01-13 | Multi-layer brake element with enhanced thermal insulation |
Country Status (9)
Country | Link |
---|---|
US (1) | US6142263A (en) |
EP (1) | EP0873480B1 (en) |
JP (1) | JP2000503099A (en) |
KR (1) | KR100441215B1 (en) |
AU (1) | AU714298B2 (en) |
DE (1) | DE69714407T2 (en) |
ES (1) | ES2180917T3 (en) |
GB (1) | GB2309057B (en) |
WO (1) | WO1997025549A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002016794A1 (en) * | 2000-08-23 | 2002-02-28 | Tmd Friction Gmbh | Brake shoe with grooved friction lining |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT412766B (en) * | 2003-01-22 | 2005-07-25 | Miba Frictec Gmbh | FRICTION BODY HAVING A POROUS INTERIOR LAYER BETWEEN A STEEL CARRIER AND A CARBURETING BASE OF CARBON FIBER |
DE102004016092A1 (en) * | 2004-04-01 | 2005-10-20 | Volkswagen Ag | Brake disk for a motor vehicle has a main body with a coating partly in an outer surface area and a layer resistant to wear |
US7028823B2 (en) * | 2004-04-28 | 2006-04-18 | General Motors Corporation | Woven composite clutch friction member with dual-directional moduli of elasticity |
US7040471B2 (en) * | 2004-04-28 | 2006-05-09 | General Motors Corporation | Sandwich composite clutch friction member with dual-directional moduli of elasticity |
DE102011051061B4 (en) * | 2011-06-15 | 2013-04-11 | Tmd Friction Services Gmbh | brake component |
ITTO20130307A1 (en) | 2013-04-17 | 2014-10-18 | Itt Italia Srl | METHOD TO REALIZE A BRAKE ELEMENT, IN PARTICULAR A BRAKE PAD, SENSORIZED, SENSORED BRAKE PAD, VEHICLE BRAKE SYSTEM AND ASSOCIATED METHOD |
EP2827017A1 (en) * | 2013-07-17 | 2015-01-21 | Chr. Mayr GmbH & Co. KG | Friction lining for electro-magnetically opening spring pressure brakes for elevators |
CN104340916B (en) * | 2013-08-01 | 2019-06-25 | Chr.迈尔有限公司及两合公司 | The friction facing of the spring pressure brake opened in an electromagnetic manner for elevator |
US9939035B2 (en) | 2015-05-28 | 2018-04-10 | Itt Italia S.R.L. | Smart braking devices, systems, and methods |
CA2921061C (en) * | 2015-06-10 | 2022-10-18 | Ray Arbesman | Brake pad with preformed multi layer friction pad and shim |
ITUB20153709A1 (en) | 2015-09-17 | 2017-03-17 | Itt Italia Srl | DATA ANALYSIS AND MANAGEMENT DEVICE GENERATED BY A SENSORIZED BRAKE SYSTEM FOR VEHICLES |
ITUB20153706A1 (en) | 2015-09-17 | 2017-03-17 | Itt Italia Srl | BRAKING DEVICE FOR HEAVY VEHICLE AND METHOD OF PREVENTING BRAKE OVERHEATING IN A HEAVY VEHICLE |
ITUA20161336A1 (en) | 2016-03-03 | 2017-09-03 | Itt Italia Srl | DEVICE AND METHOD FOR IMPROVING THE PERFORMANCE OF A VEHICLE ANTI-LOCK AND ANTI-SLIP SYSTEM |
IT201600077944A1 (en) | 2016-07-25 | 2018-01-25 | Itt Italia Srl | DEVICE FOR DETECTION OF RESIDUAL BRAKING TORQUE IN A VEHICLE EQUIPPED WITH DISC BRAKES |
DE102018202094B3 (en) * | 2018-02-12 | 2019-07-04 | Volkswagen Aktiengesellschaft | Disc brake assembly for reducing brake disc corrosion |
US20190346000A1 (en) * | 2018-05-09 | 2019-11-14 | Bremskerl North America, Inc. | Grooved Disc Brake |
IT201900015839A1 (en) | 2019-09-06 | 2021-03-06 | Itt Italia Srl | BRAKE PAD FOR VEHICLES AND ITS PRODUCTION PROCESS |
WO2022248114A1 (en) | 2021-05-25 | 2022-12-01 | Itt Italia S.R.L. | A method and a device for estimating residual torque between the braked and braking elements of a vehicle |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4373615A (en) * | 1981-01-26 | 1983-02-15 | General Motors Corporation | Laminated disc brake pad assembly |
GB2125126A (en) * | 1982-07-07 | 1984-02-29 | Nissan Motor | Disk brake pad |
US5099962A (en) * | 1990-09-17 | 1992-03-31 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Backing plate for disc brake with different damping layers for brake squeal |
GB2260173A (en) * | 1991-10-01 | 1993-04-07 | Flertex Sa | Disc brake pad for railway use |
US5407034A (en) * | 1994-01-31 | 1995-04-18 | Pre Finish Metals Incorporated | Noise damped brake pad assembly |
EP0686785A1 (en) * | 1994-06-08 | 1995-12-13 | Wagner Electric Corporation | Improved disc brake friction pad assembly |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2086502A (en) * | 1980-11-05 | 1982-05-12 | Ti Raleigh Ind Ltd | Brake block |
JPS5950236A (en) * | 1982-09-14 | 1984-03-23 | Hitachi Chem Co Ltd | Semi-metallic disc pad |
GB2261711B (en) * | 1991-11-15 | 1995-09-20 | Ferodo Ltd | Brakes |
-
1996
- 1996-01-11 GB GB9600561A patent/GB2309057B/en not_active Revoked
-
1997
- 1997-01-13 WO PCT/GB1997/000075 patent/WO1997025549A2/en active IP Right Grant
- 1997-01-13 DE DE69714407T patent/DE69714407T2/en not_active Expired - Fee Related
- 1997-01-13 AU AU13910/97A patent/AU714298B2/en not_active Ceased
- 1997-01-13 JP JP9525000A patent/JP2000503099A/en active Pending
- 1997-01-13 US US09/101,586 patent/US6142263A/en not_active Expired - Fee Related
- 1997-01-13 KR KR10-1998-0705317A patent/KR100441215B1/en not_active IP Right Cessation
- 1997-01-13 EP EP97900324A patent/EP0873480B1/en not_active Expired - Lifetime
- 1997-01-13 ES ES97900324T patent/ES2180917T3/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4373615A (en) * | 1981-01-26 | 1983-02-15 | General Motors Corporation | Laminated disc brake pad assembly |
GB2125126A (en) * | 1982-07-07 | 1984-02-29 | Nissan Motor | Disk brake pad |
US5099962A (en) * | 1990-09-17 | 1992-03-31 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Backing plate for disc brake with different damping layers for brake squeal |
GB2260173A (en) * | 1991-10-01 | 1993-04-07 | Flertex Sa | Disc brake pad for railway use |
US5407034A (en) * | 1994-01-31 | 1995-04-18 | Pre Finish Metals Incorporated | Noise damped brake pad assembly |
EP0686785A1 (en) * | 1994-06-08 | 1995-12-13 | Wagner Electric Corporation | Improved disc brake friction pad assembly |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 008, no. 154 (M-310), 18 July 1984 & JP 59 050236 A (HITACHI KASEI), 23 March 1984, * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002016794A1 (en) * | 2000-08-23 | 2002-02-28 | Tmd Friction Gmbh | Brake shoe with grooved friction lining |
Also Published As
Publication number | Publication date |
---|---|
JP2000503099A (en) | 2000-03-14 |
KR100441215B1 (en) | 2004-09-20 |
GB9600561D0 (en) | 1996-03-13 |
ES2180917T3 (en) | 2003-02-16 |
DE69714407D1 (en) | 2002-09-05 |
EP0873480B1 (en) | 2002-07-31 |
WO1997025549A3 (en) | 1997-09-18 |
EP0873480A2 (en) | 1998-10-28 |
KR19990077177A (en) | 1999-10-25 |
GB2309057A (en) | 1997-07-16 |
US6142263A (en) | 2000-11-07 |
AU714298B2 (en) | 1999-12-23 |
GB2309057B (en) | 1999-08-18 |
AU1391097A (en) | 1997-08-01 |
DE69714407T2 (en) | 2003-01-16 |
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