Patent ID: 11951956
Assignee: ZF ACTIVE SAFETY US INC.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A single chamber power transmission unit, comprising:
a ball screw;
a ball nut selectively driven by the ball screw for longitudinal motion relative thereto;
a piston operatively coupled to the ball nut;
a block housing at least partially enclosing the piston and the ball screw;
a chamber at least partially defined by the block housing and a face of the piston, the chamber being configured to contain hydraulic fluid and selectively pressurized by reciprocal motion of the piston with respect to the block housing driven directly by longitudinal motion of the ball nut, an inner wall of the chamber including a replenishment groove extending the length of the chamber;
an output channel selectively placing the chamber in fluid communication with at least one component of a brake system for provision of pressurized hydraulic fluid thereto, the output channel being in fluid communication with the replenishment groove;
an electric motor for selectively driving the ball screw to responsively reciprocate the piston within the chamber; and
a motor housing at least partially enclosing the ball nut and the electric motor.