HYDRAULIC PRESSURE GENERATOR

摘要

A hydraulic-pressure generator including: primary and secondary pistons displaced corresponding to displacement of a brake pedal; a first pressure chamber communicating with a first hollow in the primary piston and generating in brake fluid hydraulic pressure corresponding to the displacement of the primary piston; a second pressure chamber communicating with a second hollow in the secondary piston and generating in the brake fluid hydraulic pressure corresponding to the displacement of the secondary piston; one or more first communication openings formed in a peripheral wall surrounding the first hollow; and second communication openings formed in a peripheral wall surrounding the second hollow. The flow rate of the brake fluid through the one or more first communication openings is different from the flow rate of the brake fluid through the second communication openings.

主权项

1. A hydraulic-pressure generator comprising:
a secondary piston which is connected with a brake pedal and is displaced in a cylinder tube accompanied by movement of the brake pedal; a primary piston which is displaced in the cylinder tube in response to displacement of the secondary piston; a first pressure chamber which is formed in the cylinder tube so as to communicate with a first hollow formed in the primary piston, and generates in brake fluid hydraulic pressure corresponding to displacement of the primary piston; a second pressure chamber which is formed in the cylinder tube so as to communicate with a second hollow formed in the secondary piston, and generates in the brake fluid hydraulic pressure corresponding to the displacement of the secondary piston; a reservoir which reserves the brake fluid, and communicates with the cylinder tube through a first relief port and a second relief port; one or more first communication openings which are formed in a peripheral wall surrounding the first hollow, and are switched between a first communicating state in which the one or more first communication openings communicate with the first relief port and a first non-communicating state in which the one or more first communication openings do not communicate with the first relief port; and one or more second communication openings which are formed in a peripheral wall surrounding the second hollow, and are switched between a second communicating state in which the one or more second communication openings communicate with the second relief port and a second non-communicating state in which the one or more second communication openings do not communicate with the second relief port; wherein a flow rate at which the brake fluid can flow through the one or more first communication openings is different from a flow rate at which the brake fluid can flow through the one or more second communication openings.