BRAKE SYSTEM WITH ACTUATION ASSIST

摘要

A wheel braking system includes a fluid source connected to an actuator that applies a force to a friction element for retarding rotation of the wheel. The braking system also includes a hydraulic circuit that has a first fluid passage providing direct communication between the fluid source and the actuator and a second fluid passage in communication with the first passage. The second fluid passage has a first portion and a second portion and includes a reciprocating piston assembly with a first piston fixed to a second piston for selectively amplifying a volume of the pressurized fluid received by the actuator. The first portion of the second passage is in fluid communication with the first piston and the second portion is in fluid communication with the second piston. The first piston has a first diameter and the second piston has a second diameter that is greater than the first diameter.

主权项

1. A braking system for retarding rotation of a wheel, the system comprising:
a rotor configured to rotate synchronously with the wheel; a fluid source configured to supply a pressurized fluid; an actuator configured to receive the pressurized fluid from the fluid source and generate an actuator force; a friction element configured to be selectively engaged with the rotor by the actuator force to thereby retard rotation of the wheel; and a hydraulic circuit configured to provide fluid communication between the fluid source and the actuator, the hydraulic circuit having:
a first fluid passage providing direct fluid communication between the fluid source and the actuator; anda second fluid passage having a first portion and a second portion, wherein each of the first and second portions is in fluid communication with the first fluid passage; anda reciprocating piston assembly arranged inside the second fluid passage and including a first piston fixed to a second piston and configured to selectively amplify a volume of the pressurized fluid received by the actuator to thereby generate rapid engagement of the friction element with the rotor; wherein:
the first portion of the second fluid passage is in fluid communication with the first piston and the second portion of the second fluid passage is in fluid communication with the second piston; andthe first piston is defined by a first diameter and the second piston is defined by a second diameter that is greater than the first diameter.