EP0000841B1 - Perfectionnements à des matériaux de friction - Google Patents

Perfectionnements à des matériaux de friction Download PDF

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Publication number
EP0000841B1
EP0000841B1 EP78300260A EP78300260A EP0000841B1 EP 0000841 B1 EP0000841 B1 EP 0000841B1 EP 78300260 A EP78300260 A EP 78300260A EP 78300260 A EP78300260 A EP 78300260A EP 0000841 B1 EP0000841 B1 EP 0000841B1
Authority
EP
European Patent Office
Prior art keywords
friction material
friction
material according
composition
volume
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.)
Expired
Application number
EP78300260A
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German (de)
English (en)
Other versions
EP0000841A1 (fr
Inventor
John Chester
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.)
Federal Mogul Friction Products Ltd
Original Assignee
Ferodo Ltd
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 Ferodo Ltd filed Critical Ferodo Ltd
Publication of EP0000841A1 publication Critical patent/EP0000841A1/fr
Application granted granted Critical
Publication of EP0000841B1 publication Critical patent/EP0000841B1/fr
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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
    • F16D69/02—Composition of linings ; Methods of manufacturing
    • F16D69/025—Compositions based on an organic binder
    • F16D69/026—Compositions based on an organic binder containing fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/06—Elements

Definitions

  • This invention relates to friction materials, and more particularly to friction materials of the kind used for brake pads, brake linings, clutch facings and similar uses.
  • Friction materials of this kind are generally composed of a thermoset binder, and asbestos fibre reinforcement and various fillers and other additives and are used against cast iron brake discs, drums etc.
  • French Patent Specification No. 1,575,746 describes a friction material containing steel wool, but this material is for use against steel counter members, as in railway brake blocks, and is formulated from materials those function includes embrittlement of the steel so that it will break up at the surface of the brake block.
  • Proposals have also been made of compositions containing non-asbestos inorganic fibrous reinforcement for brake pads and linings of automotive types but such materials have so far had limited commercial acceptance.
  • a friction material suitable for moulded brake pads or linings comprises a thermoset binder a steel fibre reinforcement, and other fillers and additives and is characterised in that the composition consists of, in combination,
  • the inert mineral filler is present in an amount between 10 and 35 per cent by volume, and is most important from a cost point of view when comparing these materials, since asbestos is a cheap raw material being replaced by relatively expensive man-made fibre. Hence it is necessary to find a friction material having satisfactory properties but able to carry a loading of cheap filler material.
  • the fibrous reinforcement consists of fine steel fibres having a length of the order of 1 to 5mm, preferably having a diameter of the order of 0.125mm.
  • the steel may be a mild steel.
  • the fibrous reinforcement preferably constitutes at least 9% by volume of the friction material.
  • the thermoset binder includes a thermoset resin based on a phenol-formaldehyde material but may also include a heat and chemical resistant vulcanized rubber, such as a nitrile rubber.
  • a mixture of such materials is used in which the phenol-formaldehyde resin material is preferably the major constituent i.e. more than 50% of said mixture.
  • a rubber When a rubber is used it may be incorporated into the friction material in the form of a solution in an organic solvent such as trichloroethylene, or in the form of a powder, and a vulcanizing agent such as sulphur can be also used.
  • friction materials It is usual in the manufacture of friction materials to include various other material as friction and wear modifiers the proportions of which can be varied to adjust to the friction and other properties of the materials.
  • friction and wear modifiers are carbon, graphite, antimony trisulphide and molybdenum disulphide and metals in a finely divided form.
  • suitable metals are copper, brass and tin. A mixture of such materials may be used, and the total amount of such materials may be up to 40 per cent by volume.
  • the invention provides friction materials which contain no asbestos and yet which have friction properties comparable to conventional asbestos-reinforced materials.
  • Sample disc brake pads were made using the formulation given below in Table I. The ingredients were compounded together the nitrile rubber being introduced as a powder and the resulting dry mix was disintegrated and press-moulded in a die into the shape of disc-brake pads. The mouldings so produced were baked in an oven to cure the binder.
  • sample disc-brake pads were tested and their friction properties found to be comparable to materials containing asbestos as the fibre reinforcement.
  • This example illustrates a formulation with a higher loading of steel fibres.
  • Disc brake pads were manufactured to the formulation given below in Table II by the same method as used in Example 1 except that the nitrile rubber in the present example was introduced as a 16% (by weight) solution in trichloroethylene.
  • This example illustrates the use of lower binder content and higher loading of inert filler (Barytes).
  • the assembly shear strengths measured were 15237 and 13031 kN/m 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Braking Arrangements (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Claims (9)

1. Matière de friction convenant pour des pastilles ou garnitures de freins moulées qui comprend un liant thermodurci, un agent de renforcement à base de fibres d'acier et d'autres charges et additifs, caractérisée en ce qu'elle comprend en combinaison,
j) un liant thermodurci qui comprend une résine phénol-formaldéhyde et qui constitue 20 à 45% du volume de la composition, dont au moins la moitié est formée par cette résine;
ii) comme unique agent de renforcement fibreux, des fibres d'acier coupées en quantité de 5 à 15% du volume de la composition, lesquelles fibres d'acier ont une longueur de 1 à 5 mm;
iii) une charge minérale inerte qui n'est pas un oxyde métallique en une quantité de 10 à 35% du volume de la composition, et
iv) le reste de la composition étant formé par des modificateurs de friction et d'usure en quantité s'élevant jusqu'à 40% du volume de la composition.
2. Matière de friction suivant la revendication 1, dans laquelle les fibres d'acier ont un diamètre de l'ordre de 0,125 mm.
3. Matière de friction suivant la revendication 1 ou 2, dans laquelle un métal ne forme pas plus de 7% en volume (sur la base de la composition complète) des modificateurs de friction et d'usure.
4. Matière de friction suivant la revendication 1, 2 ou 3, dans laquelle les modificateurs de friction et d'usure sont en substance complètement inorganiques.
5. Matière de friction suivant l'une quelconque des revendications 1 à 4, dans laquelle le liant thermodurci comprend également un caoutchouc vulcanisé résistant à la chaleur et aux agents chimiques.
6. Matière de friction suivant la revendication 5, dans laquelle le caoutchouc est un caoutchouc nitrile.
7. Matière de friction suivant l'une quelconque des revendications précédentes, dans laquelle la charge minérale inerte est la barytine, le blanc crayeux ou la silice ou un mélange de ces charges.
8. Matière de friction suivant l'une quelconque des revendications précédentes, dans laquelle la charge minérale inerte forme 10 à 30% en volume de la matière de friction.
9. Matière de friction suivant l'une quelconque des revendications précédentes, dans laquelle les modificateurs de friction et d'usure sont choisis entre le carbone, le graphite, le trisulfure d'antimoine, le disulfure de molybdène, outre le cuivre, le laiton et l'étain sous forme finement divisée.
EP78300260A 1977-08-10 1978-08-08 Perfectionnements à des matériaux de friction Expired EP0000841B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3348577 1977-08-10
GB33485/77A GB1604828A (en) 1977-08-10 1977-08-10 Friction materials

Publications (2)

Publication Number Publication Date
EP0000841A1 EP0000841A1 (fr) 1979-02-21
EP0000841B1 true EP0000841B1 (fr) 1981-07-29

Family

ID=10353584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78300260A Expired EP0000841B1 (fr) 1977-08-10 1978-08-08 Perfectionnements à des matériaux de friction

Country Status (13)

Country Link
US (1) US4226759A (fr)
EP (1) EP0000841B1 (fr)
JP (1) JPS5434351A (fr)
AU (1) AU3875678A (fr)
BR (1) BR7805106A (fr)
CS (1) CS216921B2 (fr)
DD (1) DD138220A5 (fr)
DE (1) DE2860882D1 (fr)
GB (1) GB1604828A (fr)
IN (1) IN148771B (fr)
IT (1) IT1157152B (fr)
SU (1) SU890983A3 (fr)
ZA (1) ZA784380B (fr)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4178278A (en) * 1978-03-01 1979-12-11 Johns-Manville Corporation Friction material for railroad service
FR2429066A1 (fr) * 1978-06-20 1980-01-18 Roulements Soc Nouvelle Produit, notamment pour la fabrication de garnitures de friction
JPS55157672A (en) * 1979-04-26 1980-12-08 Kureha Chem Ind Co Ltd Organic friction material
AU6662381A (en) * 1980-02-28 1981-09-03 Goodyear Aerospace Corp. Elimination of asbestos in organic-type brake linings
US4373037A (en) * 1981-05-29 1983-02-08 Engelhard Corporation Asbestos-free friction material incorporating attapulgite clay
JPS60139932A (ja) * 1983-12-28 1985-07-24 Komatsu Ltd 湿式摩擦材
GB8405645D0 (en) * 1984-03-03 1984-04-04 Ferodo Ltd Friction materials
US4775705A (en) * 1984-10-20 1988-10-04 T&N Plc Friction materials and their manufacture
US4722950A (en) * 1986-07-07 1988-02-02 Allied Corporation Friction material
US5248301A (en) * 1987-12-03 1993-09-28 Medfusion, Inc. Transcutaneous infusion apparatus and methods of manufacture and use
GB9020070D0 (en) * 1990-09-14 1990-10-24 Ferodo Ltd Improvements in or relating to brake pads
US5122550A (en) * 1990-11-21 1992-06-16 Hoechst Celanese Corporation Cellulose ester fibrils: a molding aid for friction materials
DE4039636A1 (de) * 1990-12-12 1992-06-17 Beiersdorf Ag Heisshaertbarer klebstoff
GB2268502B (en) * 1992-07-03 1995-11-01 Ferodo Ltd Improved friction materials
JP3421364B2 (ja) * 1992-07-14 2003-06-30 曙ブレーキ工業株式会社 摩擦材
DE4224759C2 (de) * 1992-07-27 2002-04-18 Ina Schaeffler Kg Spannsystem, reibungsgedämpft für Riemen- oder Kettentriebe
JPH06346932A (ja) * 1993-06-08 1994-12-20 Akebono Brake Ind Co Ltd 摩擦材
US5413194A (en) * 1994-07-25 1995-05-09 Pneumo Abex Corporation Brake friction pad assembly
DE29724077U1 (de) * 1997-06-28 1999-11-11 DaimlerChrysler AG, 70567 Stuttgart Bremseinheit
US6161659A (en) * 1998-09-29 2000-12-19 Inertia Dynamics, Inc. Electromagnetic disk brake with rubber friction disk braking surface
JP2002226834A (ja) * 2001-01-30 2002-08-14 Nisshinbo Ind Inc 非石綿系摩擦材
JP2003113253A (ja) * 2001-07-30 2003-04-18 Nisshinbo Ind Inc 非石綿系摩擦材
MD86Y (ro) * 2006-10-04 2009-09-30 Владимир КЛЕЙМЕНОВ Compoziţie a materialului de fricţiune
MD20060243A (ro) * 2006-10-04 2008-06-30 Владимир КЛЕЙМЕНОВ Compoziţie a materialului de fricţiune

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3007890A (en) * 1959-05-07 1961-11-07 Chrysler Corp Friction elements and method of making the same
FR1575746A (fr) * 1968-04-26 1969-07-25
DE1780271A1 (de) * 1968-08-23 1971-12-30 Jurid Werke Gmbh Bremsklotz fuer Fahrzeug-Teilbelagscheibenbremsen
US4051097A (en) * 1972-01-31 1977-09-27 The Bendix Corporation Carbon metallic friction composition
US3835118A (en) * 1973-05-14 1974-09-10 Bendix Corp Sponge iron friction material
US4119591A (en) * 1977-07-05 1978-10-10 The Bendix Corporation Friction material reinforced with steel and cellulose fibers

Also Published As

Publication number Publication date
CS216921B2 (en) 1982-12-31
BR7805106A (pt) 1979-04-24
JPS5434351A (en) 1979-03-13
GB1604828A (en) 1981-12-16
IN148771B (fr) 1981-06-06
AU3875678A (en) 1980-02-14
ZA784380B (en) 1979-07-25
DE2860882D1 (en) 1981-10-29
IT1157152B (it) 1987-02-11
EP0000841A1 (fr) 1979-02-21
US4226759A (en) 1980-10-07
IT7850667A0 (it) 1978-08-09
DD138220A5 (de) 1979-10-17
SU890983A3 (ru) 1981-12-15

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