초록 ▼

A hydraulic circuit has a rotary type pump comprising a rotor rotating with a driving shaft and a casing which holds the rotor and the driving shaft. The casing further comprises an inlet port through which fluid is introduced to spaces formed by the rotor, an outlet port through which fluid is disc

A hydraulic circuit has a rotary type pump comprising a rotor rotating with a driving shaft and a casing which holds the rotor and the driving shaft. The casing further comprises an inlet port through which fluid is introduced to spaces formed by the rotor, an outlet port through which fluid is discharged from the spaces, and a hydraulic path for leading fluid from clearance around said driving shaft to the outside of the casing. A reservoir is provided to store fluid coming through the hydraulic path. A return conduit is disposed between the reservoir and an upstream side conduit connected to the inlet port in order that fluid stored in the reservoir is returned to the upstream side conduit. In the return conduit, a check valve is disposed to prevent the reverse flow of fluid from the upstream side conduit to the reservoir.

대표청구항 ▼

[ What is claimed is:] [1.] A brake apparatus for a vehicle comprising:a brake fluid pressure producing device for producing brake fluid pressure in response to braking operation of an operator;a wheel braking force generating device for generating wheel braking force using said brake fluid pressure

[ What is claimed is:] [1.] A brake apparatus for a vehicle comprising:a brake fluid pressure producing device for producing brake fluid pressure in response to braking operation of an operator;a wheel braking force generating device for generating wheel braking force using said brake fluid pressure;a main conduit connecting said wheel braking force generating device to said brake fluid pressure producing device;a pressure maintaining valve disposed in said main conduit, thereby to divide said main conduit into a first conduit part at a side of said brake fluid pressure producing device and a second conduit part at a side of said wheel braking force generating device;a pump for moving a part of brake fluid from said first conduit part to said second conduit part to produce fluid pressure in said second conduit part higher than fluid pressure in said first conduit part in cooperation with said pressure maintaining valve;a brake assist control means for driving said pump to apply said higher fluid pressure in said second conduit part to said wheel braking force generating device when said brake fluid pressure is produced by said brake fluid pressure generating device and brake assist control is required;wherein said pressure maintaining valve allows attenuating brake fluid flow from said second conduit part to said first conduit part by a predetermined amount when said pump is driven.