US 11,951,956 B2 · Single chamber power transmission unit and brake systems using same

Abstract

A brake system includes a single chamber power transmission unit, a plurality of wheel brakes, and an iso/dump control valve arrangement associated with each wheel brake of the plurality of wheel brakes. A reservoir is hydraulically connected to the single chamber power transmission unit and to each of the iso/dump control valve arrangements. A pump piston is associated with at least one wheel brake. The pump piston is driven by a second electric motor for selectively providing pressurized hydraulic fluid from the reservoir to the iso/dump control valve arrangement of the at least one associated wheel brake. First and second switching valves are provided, and are two-position, three-way type valves, each hydraulically interposed between at least one iso/dump control valve arrangement and both of a selected pump piston and the output line of the single chamber power transmission unit. First and second electronic control units are provided.

Claims23

Dependent claims

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.

6 more elements

A brake system, comprising:

a single chamber power transmission unit;
a plurality of wheel brakes;
an iso/dump control valve arrangement associated with each wheel brake of the plurality of wheel brakes;
a reservoir hydraulically connected to the single chamber power transmission unit and to each of the iso/dump control valve arrangements;
a pump piston associated with at least one wheel brake of the plurality of wheel brakes, the pump piston being driven by a second electric motor for selectively providing pressurized hydraulic fluid from the reservoir to the iso/dump control valve arrangement of the at least one associated wheel brake;
first and second switching valves, being two-position, three-way type valves, the first and second switching valves each being hydraulically interposed between at least one iso/dump control valve arrangement and both of a selected pump piston and the output line of the single chamber power transmission unit, the first switching valve being in fluid communication with an associated iso/dump control valve arrangement via a first-side line and the second switching valve being in fluid communication with an associated iso/dump control valve arrangement via a second-side line;
a first electronic control unit operative to control the electric motor of the single chamber power transmission unit and at least one of the first and second switching valves;
and
a second electronic control unit operative to control the second electric motor and at least one of the iso/dump control valve arrangements.

6 more elements

Dependencies are inferred from the claim text.

Single chamber power transmission unit and brake systems using same

Life of this patent

Single chamber power transmission unit and brake systems using same

Life of this patent

Abstract

Claims23