Brake apparatus
A brake device and brake hydraulic technology, which is applied in the direction of brake transmission, brake, transportation and packaging, etc., can solve the problems of promoting anti-lock brake device pedal force variation and pedal feeling deterioration, and achieve improved pedal performance. Sensation, the effect of preventing hydraulic pressure fluctuations
Inactive Publication Date: 2008-09-03
HITACHI LTD
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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
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[0034] Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
[0035] FIG. 1 is a diagram showing the overall system configuration of a brake device according to 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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Provided is a brake apparatus in which a hydraulic pressure in a master cylinder is prevented from being increasingly varied while an anti-lock brake system is in operation, and therefore a pedal feeling can be improved. The brake apparatus comprises 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 using an electric motor (10) as its driving source. The electric booster generates a boosted brake hydraulic pressure in the master cylinder (2) under aninput 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), hence 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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IPC IPC(8): B60T13/74
CPCB60T13/745B60T8/447B60T8/3265B60T8/4275
Inventor 山田行彦山口东马小畑卓也及川浩隆
Owner HITACHI LTD