Piston seal and disc brake using the piston seal

a technology of piston seal and disc brake, applied in the field of piston seal, can solve the problems of high temperature of piston seal and driver's unnatural brake operation, and achieve the effect of stable amount of rollback

Inactive Publication Date: 2007-11-08
NISSIN KOGYO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution effectively reduces thermal expansion and maintains sealing properties and followability, stabilizing the amount of piston rollback and brake lever stroke, thereby improving brake operation consistency from low to high temperatures.

Problems solved by technology

Therefore, the piston seal is also subjected to high temperature.
In a disc brake for a motorcycle, the amount of stroke of the brake lever changes, whereby the driver feels that the brake operation is unnatural.

Method used

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  • Piston seal and disc brake using the piston seal
  • Piston seal and disc brake using the piston seal
  • Piston seal and disc brake using the piston seal

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0056]φparts by weight of MT grade carbon black (average particle diameter: 72 nm, nitrogen adsorption specific surface area: 27 m2 / g), 2.5 parts by weight of an organic peroxide, and 1 part by weight of a co-crosslinking agent were kneaded with 100 parts by weight of EPDM manufactured by JSR corporation (trade name “EP33”) to obtain a rubber composition. A piston seal was formed by injection-molding the rubber composition. The amount of rollback of the resulting piston seal was as small as 0.055 mm. The amount of increase in lever stroke was 14 mm, which was within the allowable range.

example 2

[0057] 130 parts by weight of MT grade carbon black (average particle diameter: 72 nm, nitrogen adsorption specific surface area: 27 m2 / g), 2.5 parts by weight of an organic peroxide, and 1 part by weight of a co-crosslinking agent were kneaded with 100 parts by weight of ethylene propylene rubber to obtain a rubber composition. A piston seal was formed by injection-molding the rubber composition. The amount of rollback of the resulting piston seal was 0.040 mm, which was smaller than that in Example 1. The amount of increase in lever stroke was 10 mm, which was within the allowable range.

example 3

[0058] 150 parts by weight of MT grade carbon black (average particle diameter: 72 nm, nitrogen adsorption specific surface area: 27 m2 / g), 4 parts by weight of an organic peroxide, and 1 part by weight of a co-crosslinking agent were kneaded with 100 parts by weight of ethylene propylene rubber to obtain a rubber composition. A piston seal was formed by injection-molding the rubber composition. The amount of rollback of the resulting piston seal was as small as 0.046 mm. The amount of increase in lever stroke was 3 mm, which was within the allowable range and was smaller than that in Example 2.

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Abstract

A piston seal of a disc brake can stabilize the amount of rollback of a piston by reducing thermal expansion and a decrease in modulus of elasticity of the piston seal caused by an increase in temperature, thereby preventing a driver from feeling that the brake operation is unnatural. The piston seal is formed of a rubber composition in which at least 100 parts by weight or more of carbon black is added to 100 parts by weight of ethylene propylene rubber.

Description

[0001] This is a Division of application Ser. No. 10 / 824,368 filed Apr. 15, 2004. The disclosure of the prior application is hereby incorporated by reference herein in its entirety. [0002] Japanese Patent Application No. 2003-111554, filed on Apr. 16, 2003, is hereby incorporated by reference in its entirety.BACKGROUND OF THE INVENTION [0003] The present invention relates to a piston seal formed of a rubber composition, and a disc brake using the piston seal. [0004] A piston seal is generally formed of a rubber composition containing rubber as an essential component. For example, a vehicular disc brake is equipped with a caliper body including a piston and a cylinder. A piston seal is provided in a ring-shaped groove formed in the inner circumferential surface of the cylinder. In the disc brake, brake pads are pressed against a disc rotor secured to each wheel by applying hydraulic pressure, and rotation of the wheel is stopped by friction force of the brake pads which are made of a...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): F16D55/02C08K3/04C08L23/16F16D65/14F16D65/18F16D65/78F16D121/04F16D125/08F16J15/16
CPCF16D65/78F16J15/3284F16J15/164F16D2125/06
InventorNOGUCHI, TORUKAWATA, KAZUHITOWANIBUCHI, TAKASHIARITA, KOICHI
OwnerNISSIN KOGYO CO LTD