Hydraulic brake apparatus for a vehicle
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 12, 2002
Grant Date -
Jan 3, 2002
app pub date -
Jun 29, 2001
filing date -
Jun 30, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vehicle hydraulic brake apparatus includes a brake member, a master cylinder generating a brake hydraulic pressure by increasing the pressure of brake fluid in a reservoir, a master piston moved forward in response to operation of the brake member, a closed chamber defined behind the master piston, a power piston disposed behind the master piston, and a power chamber defined behind the power piston. An auxiliary hydraulic pressure source generates power hydraulic pressure and a pressure regulating device connects the auxiliary hydraulic pressure source with the reservoir. The power hydraulic pressure is regulated to a predetermined hydraulic pressure and is fed to the power chamber. A normally-open type valve connects the closed chamber and the power chamber, and is closable upon operation of the brake member. The closed chamber is connected to the reservoir via the normally-open type valve, the power chamber and the pressure regulating device.
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