Bwi (shanghai) Co., Ltd.

Dongqiang Luo

David F Reuter

David Fredrick Reuter, Ii

Daniel Norbert Borgemenke

Pascal Chaumette

Bin Chen

Jian Wu

Richard James Kriz, Ii

Steven Glenn Hoxie

Xiaoxu Zhao

Patrick N Hopkins

An electro-hydraulic brake system includes a master cylinder (MC) fluidly coupled to an MC fluid passageway and configured to supply fluid into the MC fluid passageway in response to pressing force on a brake pedal. A pressure supply unit (PSU) includes an electric motor and a PSU piston disposed within a piston bore, the PSU piston is movable through the piston bore by the electric motor and divides the piston bore into a first chamber and a second chamber. A pedal feel emulator (PFE) includes a PFE piston movable through a PFE bore and separating an upper chamber from a lower chamber. Fluid is conveyed from the lower chamber of the PFE to the second chamber of the PSU in response to a compression of the PFE. The MC fluid passageway provides a fluid path from the master cylinder into the upper chamber of the PFE.

Brake-by-wire system with pressure balanced PSU piston

An electro-hydraulic brake assembly comprises a hydraulic control unit (HCU) body having a top surface and a bottom surface opposite the top surface and defining a master cylinder bore and a pressure supply bore. A fluid reservoir is disposed on the top surface. A primary piston is slidably disposed in the master cylinder bore and configured to supply brake fluid to a wheel brake in response to pressing of a brake pedal. A pressure supply unit includes: a pressure supply piston disposed within the pressure supply bore; a motor located on the bottom surface of the HCU body and having a motor shaft. An actuator mechanism includes a threaded shaft configured to be rotated by the motor shaft, and a nut coupled to the pressure supply piston, together causing the pressure supply piston to translate linearly through the pressure supply bore in response to rotation of the motor shaft.

Electro-hydraulic brake assembly

A pedal feel emulator comprises a housing extending along a center axis between a closed end and an opened end and defining a chamber extending therebetween. A first piston is slidably disposed in the chamber. The first piston defines a compartment in fluid communication with the chamber. A second piston is slidably disposed in the compartment. A spring seat extends radially outwardly from the second piston. A first elastic member is located in the chamber extending between the spring seat and the closed end. A second elastic member is located in the compartment and extending between the spring seat and the first piston. A third elastic member is located between the second piston and the first piston. A brake system including the pedal feel emulator is also disclosed herein.

Pedal feel emulator assembly and a brake system including the pedal feel emulator assembly

A pedal feel emulator includes: a body; a displacement piston provided inside the body, the displacement piston being movable along an axial direction of the body, the displacement piston has a hollow part at lower part, and the hollow part is surrounded by a surrounding wall; a retainer provided fixed inside the body, the retainer being under the displacement piston; a first elastic object provided between the displacement piston and the retainer, the first elastic object being retained by the retainer; and a second elastic object provided inside the hollow part of the displacement piston, an air gap is provided between bottom surface of the second elastic object and top surface of the retainer. A brake-by-wire system including the pedal feel emulator is also disclosed herein.

Pedal free emulator and brake-by-wire system

A master cylinder includes: a cylinder body; an isolation wall provided inside the cylinder body, arranged between a first chamber and a second chamber to isolate the first chamber and the second chamber, wherein, the isolation wall is integrally formed with the cylinder body; a first piston; a second piston; a first rod provided in connection with the first piston; a second rod provided inside the cylinder body, being in connection with the first piston, wherein, the second rod is supported in the isolation wall; and a cap provided at a first opening of the cylinder body, the first opening is at an end of the second chamber along the axial direction. A brake-by-wire system including the master cylinder is also disclosed herein.

Master cylinder and brake-by-wire system

The subject disclosure provides a balance valve and a vacuum booster. The balance valve includes a valve seat (), a connecting cylinder () and a conic cylinder () orderly connected from left to right, wherein the valve seat () is annular, a sealing flange () is provided on an outer periphery of the conic cylinder (), a protruded lip () for sealing is provided on an outer periphery of the valve seat (), and the valve seat () is provided therein with a via hole () for communicating a left surface of the valve seat () with a right surface of the valve seat () outside the connecting cylinder (). The vacuum booster having the balance valve can reduce a difference between the starting force and the restoring force, thereby increasing the restoring force while keeping the starting force of the same level.

Balance valve and vacuum booster

A master cylinder assembly of the type comprises a housing () disposed along an axis (A) defining a chamber () having a cylindrical shape extending horizontally between an open end and a closed end. A first cylinder () and a second cylinder () are disposed for sliding movement axially along the axis. Each of the cylinders includes a cylindrical wall () defining a cylindrical bore (). A piston () is disposed in each of the cylindrical bores. The cylindrical wall of each cylinder includes a cylinder ramp () to define a cylinder ramp shoulder (). Each piston includes a piston ramp () to define a piston ramp shoulder (). The piston ramp shoulder () of each piston and the cylinder ramp shoulder () of each cylinder radially engage one another in an assembled position to allow the cylinders () and the pistons () to abut one another during the sliding movement axially along the axis within the chamber of the housing.

Master cylinder assembly in brake system

The present invention provides a dual-rate brake vacuum booster including a control valve body, a rubber reaction plate and a reaction rod, the rubber reaction plate being clamped between an end face of the control valve body and a base plate of the reaction rod, wherein accommodating spaces for accommodating an expansion deformation of the rubber reaction plate are respectively provided between a periphery of an end portion on one side of the rubber reaction plate and a periphery of the end face of the control valve body, and between a periphery of an end portion on the other side of the rubber reaction plate and the base plate of the reaction rod. The dual-rate brake vacuum booster prolongs the service life of the rubber reaction plate and can realize the dual-rate braking without using an additional element, thereby resulting in easy processing, simple structure and reduced cost.

Dual-rate brake vacuum booster

The present invention relates to a master cylinder assembly in a brake system and a piston stop. The master cylinder assembly comprises one or more piston assemblies. At least one of the piston assemblies comprises a piston (), a piston stop () and a spring (), wherein the piston stop () snaps into the piston (), and the spring is retained between the piston () and the piston stop () and placed outside the piston stop (). According to the present invention, on a circumferential wall of the piston stop () are provided deep slots () extending axially and running through the thickness of the circumferential wall, and these deep slots open towards one side of the piston stop where it snaps into the piston ().

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Shanghai, China

Dongqiang Luo