Brake system

a technology of brake system and cylinder, which is applied in the direction of brake system, vehicle components, braking components, etc., can solve the problems of second fluid pressure system leading to the front fluid chamber b>139/b>b, and achieve the effect of preventing hydraulic pressure chang

Inactive Publication Date: 2008-04-03
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0019]According to the fourth aspect of this invention, because the shutoff valve closing at least during operation of the ABS is arranged between the master cylinder and the electrical fluid pressure generator, it thereby prevents hydraulic pressure change due to the operation of the ABS from being transmitted as a kickback to the master cylinder.

Problems solved by technology

Therefore, there is a possibility that the second fluid pressure system leading to the front fluid chamber 139B might fail at the same time.

Method used

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first embodiment

[0030]the present invention will be described with reference to FIGS. 1 to 3.

[0031]As shown in FIG. 1, a tandem master cylinder 11 has two first fluid pressure chambers 13A and 13B which output brake fluid pressure according to a force applied to a brake pedal 12 by a driver treading on the brake pedal 12. One of the first fluid pressure chambers 13A is connected to wheel cylinders 16 and 17 of disc brake devices 14 and 15 for braking, for example, a left front wheel and a right rear wheel through fluid passages Pa, Pb, Pc, Pd, and Pe. The other first fluid pressure chamber 13B is connected to wheel cylinders 20 and 21 of disc brake devices 18 and 19 for braking, for example, a right front wheel and a left rear wheel through fluid passages Qa, Qb, Qc, Qd, and Qe.

[0032]A shutoff valve 22A, which is a normally open solenoid valve, is provided between the fluid passages Pa and Pb. A shutoff valve 22B, which is a normally open solenoid valve, is provided between the fluid passages Qa an...

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Abstract

When an electrical fluid pressure generator fails and a wheel cylinder is operated by brake fluid pressure generated by a master cylinder, if a first fluid pressure system leading to a rear fluid chamber of the electrical fluid pressure generator fails and is opened to the atmosphere, braking is performed by brake fluid pressure of a second fluid pressure system transmitted from the master cylinder through a front fluid chamber of the electrical fluid pressure generator to a wheel cylinder. At this time, a front supply port, which communicates through a front second cup seal facing rearward with the rear fluid chamber opened to the atmosphere due to the failure, does not communicate with the master cylinder but with a reservoir. Therefore, it is possible to prevent leakage of the brake fluid pressure generated by the master cylinder through the front supply port, the front second cup seal and the rear fluid chamber, thereby ensuring braking by the second fluid pressure system leading to the front fluid chamber of the electrical fluid pressure generator.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present invention claims priority under 35 USC § 119 based on Japanese patent application No. 2006-270556, filed on Oct. 2, 2006. The subject matter of this priority document is incorporated by reference herein.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a brake system having a master cylinder for generating brake fluid pressure based on a brake operation of a driver, and an electrically controlled fluid pressure generator (herein after “electrical fluid pressure generator”) for generating brake fluid pressure by an electrically controllable actuator.[0004]2. Description of the Related Art[0005]Japanese Patent Application Laid-open No. 2003-137084 discloses a brake system of the type referred to as a brake by wire (BBW) brake system, which converts a brake operation of a driver into an electrical signal used to operate an electrical fluid pressure generator, and operates a wheel cyl...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60T15/14
CPCB60T8/4081
Inventor HATANO, KUNIMICHIOHNISHI, TAKAAKI
Owner HONDA MOTOR CO LTD
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