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US 4,902,075 AGranted
Braking apparatus for vehicle
AssigneeNippondenso Co., Ltd.
InventorsHaruhiko Uno, Yuzo Imoto, Tetuya Izumi, Toshihiro Takei
Life of this patent
Estimating the term…
Abstract
A braking apparatus for a vehicle has a booster for receiving, as a pilot pressure, a pressure of a master cylinder and for regulating a pressure from an auxiliary pressure source to a level predetermined times the pilot pressure. The booster is provided with an initial pressure raising mechanism for causing the booster to output a predetermined initial pressure in response to an initial actuation of a brake pedal.
Claims5
A braking apparatus for a vehicle, comprising:
- a master cylinder for generating a pressure by the operation of a brake pedal;
- an auxiliary pressure source for accumulating a pressure;
- a booster means for receiving as a pilot pressure the pressure of said master cylinder via a pilot pipe and for regulating the pressure supplied from said auxiliary pressure source to a level predetermined times said pilot pressure and then delivering the thus regulated pressure, said booster means including piston means movable by said pilot pressure and an initial pressure raising means including spring means biasing said piston means in one direction and an electromagnetic means responsive to an initial operation of said brake pedal to vary a force of said spring means for thereby allowing said piston means to move whereby the output pressure of said booster means is speedily raised to an initial pressure of a predetermined level;
- and
- a wheel cylinder for generating a braking force upon receipt of an output pressure of said booster means.
2 more elements
A braking apparatus for a vehicle including:
- a master cylinder operable by a brake pedal to generate a pressure;
- an auxiliary pressure source for accumulating a pressure of a pressure medium;
- booster means including piston means adapted to receive as a pilot pressure the pressure of said master cylinder to modulate a pressure from said auxiliary pressure source to a level a predetermined times said pilot pressure;
- a wheel cylinder for receiving the pressure thus modulated by said booster means and generating a braking force for wheels;
- said booster means further including an offset spring for imparting to said piston means an urging force in the direction the same as that of said pilot pressure, a cancel spring for imparting to said piston means another urging force in the direction opposite to that of the urging force of said offset spring, a slidable armature for transmitting the urging force of said cancel spring to said piston means, and an electromagnetic force generating means for electromagnetically actuating said armature to make ineffective the urging force of said cancel spring;
- a braking operation detecting means for detecting an initial operation of said brake pedal;
- and
- initial energizing means for energizing said electromagnetic force generating means when the initial operation of said brake pedal is detected by said braking operation detecting means.
5 more elements
Dependencies are inferred from the claim text.