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Friction material

a technology of friction material and pores, applied in the field of friction material, can solve the problems of low frequency creep noise, odd noise at starting the vehicle, and the inability to effectively eliminate creep nois

Inactive Publication Date: 2001-09-27
NISSAN MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] 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.
[0021] 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.

Problems solved by technology

However, in the vehicle where the friction material has been used to the brake pad, there are some problems.
Otherwise, when parking outdoors in night for a long time, the friction material has absorbed a moisture in pores thereof.
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.
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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Material of the samples for the friction material

[0025] 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.

[0026] Binder

[0027] Phenolic resin

[0028] Friction modifiers for preventing the creep noise

[0029] Zeolite / antimony oxide / ethylenepolymer tetrafluoride

[0030] Other friction modifiers

[0031] Cashew dust, potassium titanate, magnesia

[0032] Lubricants

[0033] Graphite, molybdenum disulfide

[0034] Reinforcing fiber

[0035] Aramid fiber, aramid pulp

[0036] Composition of the samples for friction material

[0037] 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.

[0038] For comparison, there were prepared the sample without mixing zeolite (Comparative Example 1), the sample without mixing antimony oxide (Comparative Example 2), and the s...

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Abstract

A friction material for brake including reinforcing fibers, a friction modifier, a lubricant, and a binder, characterized by containing, as a part of the component of the friction modifier, 2 to 5 wt % zeolite, 0.8 to 2 wt % antimony oxide and 0.2 to 1 wt % fluorine based polymer.

Description

[0001] 1. Field of the Invention[0002] 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.[0003] 2. Description of the Related Art[0004] 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.[0005] 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 cr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K3/14F16D65/00F16D69/02C08J5/14
CPCF16D65/0006F16D69/026Y10T428/2913Y10T428/24994Y10T428/249964Y10T428/249924Y10T442/2311Y10T428/249938Y10T428/3154
Inventor OGATA, YOSHIOSASAKI, YOSUKE
Owner NISSAN MOTOR CO LTD
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