Hydraulic brake device for a vehicle
AssigneeAisin Seiki Kabushiki Kaisha
InventorsSatoshi Ishida, Michiharu Nishii
Life of this patent
Estimating the term…
Abstract
A hydraulic brake device for a vehicle includes an auxiliary piston having an effective cross-sectional area larger than that of a master piston, and a pressure transmitting chamber provided between the large diameter portion and the master piston. The auxiliary piston is operatively associated with the assisting operation of an assisting device. A valve mechanism hydraulically closes the pressure transmitting chamber when the actuation of the master piston is assisted by the assisting device through the auxiliary piston and establishes hydraulic communication between the pressure transmitting chamber and a reservoir of the master cylinder when the master piston is not actuated by the assisting device.
Claims18
A hydraulic brake device for a vehicle, comprising:
- a master cylinder having a master piston for supplying brake pressure in response to brake pedal depression;
- an assisting device for assisting actuation of the master piston in response to brake pedal depression;
- an auxiliary piston including an effective cross-sectional area larger than that of the master piston and being operatively associated with the assisting operation of the assisting device;
- a pressure transmitting chamber provided between the auxiliary piston and the master piston, the pressure transmitting chamber being defined around an outer surface of the master piston;
- and
- a valve mechanism for hydraulically closing the pressure transmitting chamber when the actuation of the master piston is assisted by the assisting device through the auxiliary piston and establishing hydraulic communication between the pressure transmitting chamber and a reservoir of the master cylinder when the actuation of the master piston is not assisted by the assisting device.
A hydraulic brake device for a vehicle, comprising:
- a master cylinder for supplying brake pressure in response to brake pedal depression, the master cylinder including a master piston;
- an assisting device for assisting actuation of the master piston in response to brake pedal depression;
- an auxiliary piston operatively associated with the assisting device to be operated upon operation of the assisting device, the auxiliary piston including an effective cross-sectional area larger than that of the master piston;
- a pressure transmitting chamber provided between the auxiliary piston and the master piston, the pressure transmitting chamber being defined around an outer surface of the master piston;
- a hydraulic passage formed in the master piston or in the auxiliary piston;
- a valve seat disposed in the hydraulic passage;
- a valve body biased by a spring to engage the valve seat to close the hydraulic passage and seal the pressure transmitting chamber when the actuation of the master piston is assisted by the assisting device through the auxiliary piston, the valve body being movable away from the valve seat to open the hydraulic passage and establish hydraulic communication between the pressure transmitting chamber and a reservoir of the master cylinder when the actuation of the master piston is not assisted by the assisting device.
Dependencies are inferred from the claim text.