초록 ▼

A braking unit includes an intensifier mechanism for intensifying a braking liquid pressure of a master cylinder upon failure of a liquid pressure booster. The braking unit comprises the intensifier mechanism for intensifying the braking liquid pressure of the master cylinder when actuated, and a co

A braking unit includes an intensifier mechanism for intensifying a braking liquid pressure of a master cylinder upon failure of a liquid pressure booster. The braking unit comprises the intensifier mechanism for intensifying the braking liquid pressure of the master cylinder when actuated, and a control valve which makes the intensifier mechanism operable upon failure of the liquid pressure booster. The control valve comprises a valve member which is urged by a spring tensioned with a given load and which is urged in the opposite direction from the spring by a liquid pressure of a power chamber of the liquid pressure booster. The valve member makes the intensifier mechanism operable whenever the resilience of the spring exceeds the urging force produced by the liquid pressure in the power chamber of the liquid pressure booster. This prevents an operational lag of the intensifier mechanism in the event the liquid pressure booster fails.

대표청구항 ▼

An intensifier assembly for a vehicle braking unit, the braking unit including a booster connected to a brake pedal to boost a braking liquid when the brake pedal is depressed, a master cylinder connected to the booster to receive the boosted braking liquid from the booster and to generate a pressur

An intensifier assembly for a vehicle braking unit, the braking unit including a booster connected to a brake pedal to boost a braking liquid when the brake pedal is depressed, a master cylinder connected to the booster to receive the boosted braking liquid from the booster and to generate a pressurized braking liquid for application to a wheel cylinder in response to receiving the boosted braking liquid, said intensifier assembly including: an intensifier unit including: a casing, said casing being shaped to have an inlet through which pressurized braking liquid from the master cylinder is received and an outlet opposite said inlet through which braking liquid is discharged to the wheel cylinder; a movable piston disposed in said casing, said piston having a front end located adjacent said casing inlet and a rear end located adjacent said casing outlet; and a biasing mechanism extending between said casing and said piston for urging said piston towards said casing inlet; and a control valve disposed in said piston for controlling actuation of said piston, said control valve including: a fluid passageway formed in said piston so as to extend between said piston front end and said piston rear end so as to allow braking liquid flow through said piston; a valve member slidably movable in said piston, said valve member having a valve seat disposed in said fluid passageway and movable between a open position for allowing braking liquid fluid flow through said fluid passageway and a closed position that blocks braking liquid flow through said fluid passageway; a pressure chamber formed in said piston around said valve member by at least one surface of said valve member and connected to receive boosted braking liquid from the booster, said pressure chamber being positioned so that when the boosted braking liquid is applied thereto, said valve member is urged towards said valve seat open position; and a spring disposed in said piston and positioned against said valve member for urging said valve member towards said valve seat closed position, said spring being configured to operate in opposition to said force imposed by the boosted braking liquid in said control valve pressure chamber so that when the force of the boosted braking liquid falls, said spring urges said valve member to said valve seat closed position.