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Brake-fluid-pressure-control-apparatus

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Brake fluid pressure control apparatus

Details

Inventors: Maehara, Toshifumi;
Assignee: Akebono Brake Industry Co., Ltd. (Tokyo, JP)
Primary Examiner: Oberleitner; Robert J.
Assistant Examiner: Young; Lee W.
Attorney, Agent or Firm: Knobbe, Martens, Olson & Bear

A brake fluid pressure control apparatus is disclosed which is capable of providing a good brake feel at the initial stage of pressure reapplication. The brake fluid pressure control apparatus comprises a pressure receiving device 25 and a valve mechanism 19 for closing a fluid passage 10 from a master cylinder 7 to wheel cylinders 8. The wheel cylinder fluid pressure is held by closing the fluid passage when the vehicle is brought to a halt with the brake applied, so that the vehicle can be held stationary if the driver takes his food off the brake pedal. When the pressure is to be applied again from the master cylinder 7, the pressure applied during the initial period of this reapplication of the master cylinder pressure is received by the pressure receiving device.

DETAILED DESCRIPTION The present invention has been accomplished in an attempt to solve the problems mentioned above and has as its object the provision of a brake fluid pressure control apparatus which gives a vehicle driver an improved brake pedal operation feeling in the initial stage of reapplication of brake pressure.
According to the present invention, a brake fluid pressure control apparatus has a valve mechanism.
This valve mechanism is inserted in a main fluid passage which connects a master cylinder to wheel cylinders.
The valve mechanism has a main control valve for closing the main fluid passage so as to hold the wheel cylinder fluid pressure when a motor vehicle is halted and held stationary with brakes applied.
Therefore the vehicle can be kept in the stationary state even if the driver takes his foot off the brake pedal.
The valve mechanism has a check valve mounted in the main fluid passage.
The check valve permits the supply of the fluid pressure from the master cylinder to the wheel cylinders when said main fluid passage is closed by the main control valve.
The present invention has a brake fluid receiving device for receiving and consuming initial fluid pressure from the master cylinder when the master cylinder operates to apply the fluid pressure again after the main control closes the main fluid passage upon detecting the halt of the motor vehicle.
The check valve opens to apply the fluid pressure to the wheel cylinder through the check valve after receiving and consuming the initial fluid pressure from the master cylinder by the brake fluid receiving device.
In the present invention, more preferably, the brake fluid receiving device has a stepped cylinder.
This cylinder has a inlet port connected to the master cylinder and an outlet port connected to the wheel cylinders.
The brake fluid receiving device has a stepped piston housed in the stepped cylinder.
The stepped cylinder has a large diameter end receiving a fluid pressure of the master cylinder and a small diameter end receiving a fluid pressure of wheel cylinders

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