US20010024917A1 - Friction material - Google Patents
Friction material Download PDFInfo
- Publication number
- US20010024917A1 US20010024917A1 US09/748,267 US74826700A US2001024917A1 US 20010024917 A1 US20010024917 A1 US 20010024917A1 US 74826700 A US74826700 A US 74826700A US 2001024917 A1 US2001024917 A1 US 2001024917A1
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- United States
- Prior art keywords
- small
- friction
- friction material
- zeolite
- passed
- 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.)
- Granted
Links
- 239000002783 friction material Substances 0.000 title claims abstract description 29
- 239000003607 modifier Substances 0.000 claims abstract description 22
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 10
- 229910000410 antimony oxide Inorganic materials 0.000 claims abstract description 10
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011737 fluorine Substances 0.000 claims abstract description 10
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 10
- 229920000642 polymer Polymers 0.000 claims abstract description 10
- 239000010457 zeolite Substances 0.000 claims abstract description 10
- 239000011230 binding agent Substances 0.000 claims abstract description 9
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000012783 reinforcing fiber Substances 0.000 claims abstract description 9
- 239000000314 lubricant Substances 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229920003235 aromatic polyamide Polymers 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 239000004760 aramid Substances 0.000 description 4
- 229920006231 aramid fiber Polymers 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229920001568 phenolic resin Polymers 0.000 description 4
- 239000005011 phenolic resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
- 244000226021 Anacardium occidentale Species 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229920000561 Twaron Polymers 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 235000020226 cashew nut Nutrition 0.000 description 2
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 2
- 238000011990 functional testing Methods 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 2
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 2
- 239000004762 twaron Substances 0.000 description 2
- 229920002972 Acrylic fiber Polymers 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 229920000271 Kevlar® Polymers 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- -1 polyethylene hexafluoropropylene copolymer Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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
-
- 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
- F16D65/0006—Noise or vibration control
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
- Y10T428/249933—Fiber embedded in or on the surface of a natural or synthetic rubber matrix
- Y10T428/249938—Composite or conjugate fiber [e.g., fiber contains more than one chemically different material in monofilament or multifilament form, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
- Y10T428/24994—Fiber embedded in or on the surface of a polymeric matrix
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249962—Void-containing component has a continuous matrix of fibers only [e.g., porous paper, etc.]
- Y10T428/249964—Fibers of defined composition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/3154—Of fluorinated addition polymer from unsaturated monomers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2311—Coating or impregnation is a lubricant or a surface friction reducing agent other than specified as improving the "hand" of the fabric or increasing the softness thereof
Definitions
- the present invention relates to a friction material, and more particularly relates to a friction material for a brake which may be used to such as vehicles to reduce braking noises. More specifically, the present invention relates to a brake pad or a brake lining which may be used to braking a vehicle.
- a friction material to be used to a brake pad, a brake lining or a clutch facing of vehicles, for example, automobiles is generally formed as a composite material composed of reinforcing fibers, a friction modifier, a binder, etc.
- the creep noise produced at starting the vehicle is the odd noise of low frequency of about 100 to 400 Hz which is produced due to instantaneous variation of a friction coefficient between the friction material and a counterpart material at ultra low speed.
- the creep noise gives unpleasant feelings to users in general markets, and recently has been demanded to take any measures.
- the invention has solved the problem by a friction material including reinforcing fibers, a friction modifier, a lubricant, and a binder, characterized by containing, as a part of the component of the friction modifier, zeolite in an amount of from 2 to 5 wt %, antimony oxide in an amount of from 0.8 to 2 wt % and fluorine based polymer in an amount of from 0.2 to 1 wt %
- the friction material composed of the reinforcing fibers, the friction modifier, the lubricant, and the binder is mixed with the above mentioned raw materials, previously molded in accordance with ordinary production methods, and thermally formed.
- the reinforcing fibers may include a heat resistant organic fiber, for example, an aromatic polyamid fiber or a frame resistant acrylic fiber.
- a heat resistant organic fiber for example, an aromatic polyamid fiber or a frame resistant acrylic fiber.
- an aramid fiber or an aramid pulp may be preferably used because of high strength and high heat resistance.
- the preferred aramid fiber and aramid pulp may include Kevlar, a trade name (made by Du Pont) or Twaron, a trade name (made by Twaron Products).
- thermosetting resin such as a phenolic resin (including straight phenolic resin and various phenolic resins modified by rubber), or the like and a polyimid resin.
- the friction modifier for adjusting the friction property of friction coefficient enumerated are, for example, inorganic friction modifiers such as alumina or silica, magnesia, zirconia, chromium oxide, potassium titanate or quartz, organic friction modifiers such as synthetic rubber, or cashew resin, and as the lubricant, there may be enumerated, for example, graphite or molybdenum disulfide.
- the friction modifier for preventing generation of the creep noise is characterized by containing zeolite, antimony oxide, and fluorine based polymer.
- fluorine based polymer there may be enumerated ethylene polymer tetrafluoride, tetrafluoroethylene polyethylene hexafluoropropylene copolymer, polyviniliden fluoride and the combination of these elements.
- ethylene polymer tetrafluoride is preferred.
- zeolite is 2 to 5 wt %
- antimony oxide is 0.8 to 2 wt %
- fluorine based polymer is 0.2 to 1 wt %.
- the brake pad is produced in that a sheet is pressed into a predetermined shape, subjected to a degreasing treatment and a primer treatment, and a pressure plate coated with an adhesive and a pre-formed body are formed at a predetermined temperature and at a predetermined pressure in a thermally forming procedure into an integral combination of both members, and this combination passes through an after cure and a finally finishing treatment, said pre-formed body being formed by mixing the reinforcing fibers of heat resistant organic fiber, the lubricant, the friction modifier and the binder of heat setting resin, and forming (preforming) the friction modifier completely homogenized by stirring, at room temperature and at a predetermined pressure.
- the above mentioned steps are the same as those of the prior art.
- the friction materials for brake pad were made of the samples of the above mentioned compositions through a prior art process.
- a vehicle equipped with a new rotor and a disc brake having the brake pad composed of the friction material of the above mentioned sample was braked to stop at an initial speed of 50 km/h every 1 km travelling over 200 km, and after a sufficient sliding contact between the friction material and the rotor was obtained, the following tests were performed.
- a passed level at absorbing humidity is “very small” or less, and at heightening temperature and water wetting the passed level is “small” or less.
- TABLE 2 At At increasing At wetting All round moistening temperature with water evaluations Ex. 1 Very small Small Small Passed Ex. 2 Very small Very small Very small Passed Ex. 3 Very small Very small Very small Passed Ex. 4 Very small Very small Very small Fassed Ex. 5 Very small Small Small Passed Ex. 6 Very small Very small Very small Passed Ex. 7 Very small Very small Passed Ex. 8 Very small Very small Very small Passed Com. 1 Very small Middle Small Not passed Com. 2 Small Large Small Not passed Com. 3 Small Middle Large Not passed
- the creep noise generated at starting the vehicle may be effectively reduced by using, as the friction modifier, zeolite, antimony oxide and fluorine based polymer of predetermined amounts to the friction material including the reinforcing fibers, the friction modifier, the lubricant and the binder.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
Description
- 1. Field of the Invention
- The present invention relates to a friction material, and more particularly relates to a friction material for a brake which may be used to such as vehicles to reduce braking noises. More specifically, the present invention relates to a brake pad or a brake lining which may be used to braking a vehicle.
- 2. Description of the Related Art
- A friction material to be used to a brake pad, a brake lining or a clutch facing of vehicles, for example, automobiles, is generally formed as a composite material composed of reinforcing fibers, a friction modifier, a binder, etc.
- However, in the vehicle where the friction material has been used to the brake pad, there are some problems. When passing puddles or washing the vehicle, a rotor and the brake pad are wetted by a water. Otherwise, when parking outdoors in night for a long time, the friction material has absorbed a moisture in pores thereof. In such cases, the brake is dragged by a creeping force when starting at low speed and a low frequency noise tend to be generated while the water or the moisture are dried and when a vehicle (for example, an automatic (AT) car) starts, that is, the brake pedal is pressed and the change gear is brought into a running range for loosening until the brake is completely released.
- Further, when temperature of the brake is increased by repeating the braking operation and the component contained in the friction material is adhered to the rotor, odd noises of low frequency are created at starting the vehicle also due to stick-slip which might be caused between a film of the component and the friction material.
- This odd noise of low frequency issued when starting the vehicle is specifically called as a “creep noise”.
- The creep noise produced at starting the vehicle is the odd noise of low frequency of about 100 to 400 Hz which is produced due to instantaneous variation of a friction coefficient between the friction material and a counterpart material at ultra low speed. The creep noise gives unpleasant feelings to users in general markets, and recently has been demanded to take any measures.
- It is accordingly an object of the invention to provide a friction material for effectively reducing the creep noise which is produced when starting the vehicle.
- Inventors made many studies on kinds of friction modifiers for providing friction materials which may effectively reduce the creep noise generated at starting the vehicle.
- As the friction modifier for preventing the creep noise, zeolite, antimony oxide and fluorine based polymer of specified amounts were selected, and noticing an effective prevention of the creep noise by the combination of three components, thus the invention has been attained.
- Namely, the invention has solved the problem by a friction material including reinforcing fibers, a friction modifier, a lubricant, and a binder, characterized by containing, as a part of the component of the friction modifier, zeolite in an amount of from 2 to 5 wt %, antimony oxide in an amount of from 0.8 to 2 wt % and fluorine based polymer in an amount of from 0.2 to 1 wt %
- For producing the friction material of the invention, the friction material composed of the reinforcing fibers, the friction modifier, the lubricant, and the binder is mixed with the above mentioned raw materials, previously molded in accordance with ordinary production methods, and thermally formed.
- As to the friction material of the invention, the reinforcing fibers may include a heat resistant organic fiber, for example, an aromatic polyamid fiber or a frame resistant acrylic fiber. Above of all, an aramid fiber or an aramid pulp may be preferably used because of high strength and high heat resistance. The preferred aramid fiber and aramid pulp may include Kevlar, a trade name (made by Du Pont) or Twaron, a trade name (made by Twaron Products).
- For the binder, there may be enumerated, for example, thermosetting resin such as a phenolic resin (including straight phenolic resin and various phenolic resins modified by rubber), or the like and a polyimid resin.
- Further, as the friction modifier for adjusting the friction property of friction coefficient, enumerated are, for example, inorganic friction modifiers such as alumina or silica, magnesia, zirconia, chromium oxide, potassium titanate or quartz, organic friction modifiers such as synthetic rubber, or cashew resin, and as the lubricant, there may be enumerated, for example, graphite or molybdenum disulfide.
- According to the invention, the friction modifier for preventing generation of the creep noise is characterized by containing zeolite, antimony oxide, and fluorine based polymer.
- For the fluorine based polymer, there may be enumerated ethylene polymer tetrafluoride, tetrafluoroethylene polyethylene hexafluoropropylene copolymer, polyviniliden fluoride and the combination of these elements. Among these elements, the ethylene polymer tetrafluoride is preferred.
- As to the mixing amounts of the friction modifier to be used to the friction material of the invention, it is required that zeolite is 2 to 5 wt %, antimony oxide is 0.8 to 2 wt % and fluorine based polymer is 0.2 to 1 wt %.
- In case the mixing rate of each of the friction modifiers is less than the lower limit of the specified values, the creep noise will not be effectively eliminated.
- On the other hand, if the amount of zeolite is higher than 5 wt %, a wear-resistance is reduced and a commercial value is lowered accordingly. Further, if the amount of antimony oxide is higher than 2 wt %, a fade-resistance is lowered. Further, if the amount of fluorine based polymer is higher than 1 wt %, the braking effect is decreased.
- The brake pad is produced in that a sheet is pressed into a predetermined shape, subjected to a degreasing treatment and a primer treatment, and a pressure plate coated with an adhesive and a pre-formed body are formed at a predetermined temperature and at a predetermined pressure in a thermally forming procedure into an integral combination of both members, and this combination passes through an after cure and a finally finishing treatment, said pre-formed body being formed by mixing the reinforcing fibers of heat resistant organic fiber, the lubricant, the friction modifier and the binder of heat setting resin, and forming (preforming) the friction modifier completely homogenized by stirring, at room temperature and at a predetermined pressure. The above mentioned steps are the same as those of the prior art.
- The invention will be specifically described in reference to an Example. It should, however, be noted that the invention is not limited thereto.
- Material of the samples for the friction material
- As materials for producing the samples of the friction material, the followings were employed, and for making the samples, selected materials therefrom were prepared, and mixtures for the samples were varied respectively.
- Binder
- Phenolic resin
- Friction modifiers for preventing the creep noise
- Zeolite /antimony oxide / ethylenepolymer tetrafluoride
- Other friction modifiers
- Cashew dust, potassium titanate, magnesia
- Lubricants
- Graphite, molybdenum disulfide
- Reinforcing fiber
- Aramid fiber, aramid pulp
- Composition of the samples for friction material
- As the compositions for producing for the friction material, the Examples 1 to 8 were made with the mixing rates as shown in Table 1.
- For comparison, there were prepared the sample without mixing zeolite (Comparative Example 1), the sample without mixing antimony oxide (Comparative Example 2), and the sample without mixing fluorine based polymer (Comparative Example 3),
- Production of the friction material samples
- The friction materials for brake pad were made of the samples of the above mentioned compositions through a prior art process.
TABLE 1 Unit: Weight % Aramid fiber, Aramid Oxide A pulp B Zeolite Antimony C D Ex. 1 20 12 15 2 0.8 0.2 50 Ex. 2 20 12 15 2 2 0.2 48.8 Ex. 3 20 12 15 2 0.8 1 49.2 Ex. 4 20 12 15 2 2 1 48 Ex. 5 20 12 15 5 0.8 0.2 47 Ex. 6 20 12 15 5 2 0.2 45.8 Ex. 7 20 12 15 5 0.8 1 46.2 Ex. 8 20 12 15 5 2 1 45 Com. 1 20 12 15 0 0.8 1 51.2 Com. 2 20 12 15 2 0 0.2 50.8 Com. 3 20 12 15 2 0.0 0 50.2 - Testing method
- A vehicle equipped with a new rotor and a disc brake having the brake pad composed of the friction material of the above mentioned sample was braked to stop at an initial speed of 50 km/h every 1 km travelling over 200 km, and after a sufficient sliding contact between the friction material and the rotor was obtained, the following tests were performed.
- Test at moistening
- The vehicle was left in an environmental chamber for 12 hours at temperature 20° C. and humidity 95% (RH), and then functional tests were carried out 10 times with respect to generation of the creep noise at speed of 20 km/h and after braking at speed reduction 0.2 G.
- Test at increasing temperature
- The functional tests were carried out 10 times with respect to generation of the creep noise in the course of temperature variation of the friction material at 50° C. - 200° C. −50°C. at an initial speed of 30 km/h and by braking at speed reduction 0.3 G.
- Test at wetting with water
- The rotor and the friction material were applied with water of 10 liters per minute to the right and left wheels for 1 minute respectively, and for 2 minutes in total. The functioning tests were carried out 10 times with respect to generation of the creep noise at speed of 20 km/h and after braking speed reduction 0.2 G.
- Results
- The tested results are shown in Table 2.
- The results in Table 2 indicate magnitude of the largest sounds of the tests of 10 times.
- A passed level at absorbing humidity is “very small” or less, and at heightening temperature and water wetting the passed level is “small” or less.
TABLE 2 At At increasing At wetting All round moistening temperature with water evaluations Ex. 1 Very small Small Small Passed Ex. 2 Very small Very small Very small Passed Ex. 3 Very small Very small Very small Passed Ex. 4 Very small Very small Very small Fassed Ex. 5 Very small Small Small Passed Ex. 6 Very small Very small Very small Passed Ex. 7 Very small Very small Very small Passed Ex. 8 Very small Very small Very small Passed Com. 1 Very small Middle Small Not passed Com. 2 Small Large Small Not passed Com. 3 Small Middle Large Not passed - Ex. ; Examples Com. : Comparative examples
- According to the invention, the creep noise generated at starting the vehicle (for example, an automatic (AT) car) may be effectively reduced by using, as the friction modifier, zeolite, antimony oxide and fluorine based polymer of predetermined amounts to the friction material including the reinforcing fibers, the friction modifier, the lubricant and the binder.
Claims (1)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11-374008 | 1999-12-28 | ||
JPHEI.11-374008 | 1999-12-28 | ||
JP37400899A JP3883350B2 (en) | 1999-12-28 | 1999-12-28 | Friction material for brake |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010024917A1 true US20010024917A1 (en) | 2001-09-27 |
US6447917B2 US6447917B2 (en) | 2002-09-10 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/748,267 Expired - Lifetime US6447917B2 (en) | 1999-12-28 | 2000-12-27 | Friction material |
Country Status (2)
Country | Link |
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US (1) | US6447917B2 (en) |
JP (1) | JP3883350B2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003102440A1 (en) * | 2002-05-31 | 2003-12-11 | Tmd Friction Europe Gmbh | Device for detecting the amount of splash water to which a brake pad is subjected on a wet roadway |
CN105722942A (en) * | 2013-11-12 | 2016-06-29 | 曙制动器工业株式会社 | Friction material composition and friction material |
US20180010660A1 (en) * | 2015-01-23 | 2018-01-11 | Akebono Brake Industry Co., Ltd. | Friction material |
US10415661B2 (en) | 2015-06-19 | 2019-09-17 | Advics Co., Ltd. | Non-asbestos friction material |
US11274720B2 (en) * | 2012-08-07 | 2022-03-15 | Itt Italia S.R.L. | Friction material |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4613131B2 (en) * | 2003-02-05 | 2011-01-12 | 日立化成工業株式会社 | Friction material composition and friction material using friction material composition |
JP5765341B2 (en) * | 2010-08-09 | 2015-08-19 | 日立化成株式会社 | Friction material composition, friction material and friction member using the same |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2431003A1 (en) * | 1973-06-27 | 1975-01-30 | Sumitomo Electric Industries | THERMOPLASTIC RESIN COMPOSITES CONTAINING LUBRICANTS, METHOD OF MANUFACTURING THEM AND USING IT AS A BEARING |
US4530881A (en) * | 1983-02-24 | 1985-07-23 | Raymark Industries, Inc. | Fluoroelastomer-based friction material having improved frictional properties |
WO1988008857A1 (en) * | 1987-05-08 | 1988-11-17 | Asahi Kasei Kogyo Kabushiki Kaisha | Fluorine-containing elastomer and its moldings |
-
1999
- 1999-12-28 JP JP37400899A patent/JP3883350B2/en not_active Expired - Lifetime
-
2000
- 2000-12-27 US US09/748,267 patent/US6447917B2/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003102440A1 (en) * | 2002-05-31 | 2003-12-11 | Tmd Friction Europe Gmbh | Device for detecting the amount of splash water to which a brake pad is subjected on a wet roadway |
US20060180415A1 (en) * | 2002-05-31 | 2006-08-17 | Christian Wiatarek | Device for detecting the amount of splash water to which a brake pad is subjected on a wet roadway |
AU2003233322B2 (en) * | 2002-05-31 | 2006-10-19 | Tmd Friction Europe Gmbh | Device for detecting the amount of splash water to which a brake pad is subjected on a wet roadway |
US7360409B2 (en) * | 2002-05-31 | 2008-04-22 | Tmd Friction Services Gmbh | Device for detecting the amount of splash water to which a brake pad is subjected on a wet roadway |
US11274720B2 (en) * | 2012-08-07 | 2022-03-15 | Itt Italia S.R.L. | Friction material |
CN105722942A (en) * | 2013-11-12 | 2016-06-29 | 曙制动器工业株式会社 | Friction material composition and friction material |
US20180010660A1 (en) * | 2015-01-23 | 2018-01-11 | Akebono Brake Industry Co., Ltd. | Friction material |
US10415661B2 (en) | 2015-06-19 | 2019-09-17 | Advics Co., Ltd. | Non-asbestos friction material |
Also Published As
Publication number | Publication date |
---|---|
US6447917B2 (en) | 2002-09-10 |
JP3883350B2 (en) | 2007-02-21 |
JP2001181607A (en) | 2001-07-03 |
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