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Brake apparatus

By introducing an electric actuator into the electric power assist device to limit the movement of the auxiliary components, the problem of hydraulic pressure changes in the master cylinder caused by the action of the anti-lock braking device is solved, and the stability of the pedal feel is improved.

Inactive Publication Date: 2013-02-27
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, if the pedaling force fluctuates due to the operation of the anti-lock brake device, the electric motor for giving auxiliary thrust is activated due to the fluctuation of the pedaling force, so the hydraulic pressure fluctuation in the master cylinder becomes large, and as a result, there is a boost Pedal force fluctuations during the operation of the anti-lock brake device, and the problem that the pedal feel is significantly deteriorated

Method used

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Embodiment Construction

[0034] Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

[0035] figure 1 It is a diagram showing the overall system configuration of the braking device of the present invention. In the figure, 1 is a hydraulic unit, which has an integrated tandem master cylinder 2 and an electric power booster 3, and generates brake hydraulic pressure in the master cylinder 2 according to the operation of the brake pedal 4; 5 is an anti-lock braking system. The hydraulic circuit of the moving device (ABS); 6 is the wheel brake cylinder (here is the disc brake). Here, the wheel brake cylinders 6 are distributed in an X-type circuit, that is, RL and FR, RR and FL form a pair, and are connected to each independently extended pressure chamber of the tandem master cylinder 2 through the ABS hydraulic circuit 5. Main brake fluid passages 7A, 7B.

[0036] As will be described later, the electric power booster 3 has: an input membe...

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Abstract

An object of the present invention is to provide a brake apparatus in which a hydraulic pressure in a master cylinder (2) is prevented from being increasingly varied while an anti-lock brake system (5) is in operation, and therefore a pedal feeling can be improved. The brake apparatus comprises an electric booster (3) including an input member (8) which moves forward or backward in response to an operation of a brake pedal (4), an assist member (9) which moves forward or backward by being driven by an electric actuator (11) using an electric motor (10) as its driving source. The electric booster (3) generates a boosted brake hydraulic pressure in the master cylinder (2) under an input thrust provided to the input member (8) through the brake pedal (4) and an assist thrust provided to the assist member (9) by the electric actuator (11). In the brake apparatus, the brake hydraulic pressure generated in the master cylinder (2) is supplied to a wheel cylinder (6) through a hydraulic pressure circuit of an anti-lock brake system (5), and, while the anti-lock brake system (5) in operation, an operation of the assist member (9) is restricted by a booster control (12), whereby a change in a hydraulic pressure in the master cylinder (2) due to the operation of the assist member (9) can be restrained.

Description

technical field [0001] The present invention relates to a brake device used for braking a vehicle, and more specifically, to a brake device including an electric power booster that operates an electric actuator as a power boost source. Background technique [0002] An example of an electric booster that operates an electric actuator as an assist source is the electric booster disclosed in Patent Document 1. This electric power booster has: a main piston (input member) that moves forward and backward according to the operation of the brake pedal, and a booster piston (auxiliary member) that moves forward and backward by an electric motor (electric actuator). The input thrust of the main piston and the supercharging thrust (auxiliary thrust) transmitted from the electric motor to the booster piston generate brake hydraulic pressure in the master cylinder, and a part of the reaction force generated by the brake hydraulic pressure is transmitted to the input member, and the othe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T13/74
CPCB60T8/4275B60T8/447B60T8/3265B60T13/745
Inventor 山田行彦山口东马小畑卓也及川浩隆
Owner HITACHI LTD