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US 11,084,476 B2Granted
Vacuum brake booster for a vehicle braking system
AssigneeZF Active Safety GmbH
InventorJaroslav Kolar
Life of this patent
Estimating the term…
Abstract
A vacuum brake booster includes: at least one movable wall, which separates a working chamber and a vacuum chamber in the vacuum brake booster from one another, and a control valve unit, which is coupled to the at least one movable wall, the control valve unit comprising a guide sleeve and an actuation piston guided displaceably in the control valve unit, which actuation piston is actuatable by way of a force input member which can be coupled in particular to a brake pedal, the actuation piston having at least one first valve seat, which in the open state is used to connect the working chamber to the ambient atmosphere.
Claims10
A vacuum brake booster comprising:
- at least one movable wall which separates a working chamber and a vacuum chamber in the vacuum brake booster from one another, and
- a control valve unit which is coupled to the at least one movable wall,
- wherein the control valve unit comprises a guide sleeve and an actuating piston which is guided displaceably in the control valve unit and which is actuatable by means of a force input member which is couplable to a brake pedal,
- wherein the actuating piston has at least one first valve seat which, in the opened state, serves for connecting the working chamber to the surrounding atmosphere,
- wherein the actuating piston has a first flow control portion, which projects in the direction of the guide sleeve, and the guide sleeve has a second flow control portion, which projects in the direction of the actuating piston and overlaps with the first flow control portion in an axial direction,
- wherein the first flow control portion and the second flow control portion slide along and relative to one another for controlling the air stream flowing to the first valve seat.
3 more elements
A vacuum brake booster comprising:
- at least one movable wall which separates a working chamber and a vacuum chamber in the vacuum brake booster from one another, and
- a control valve unit which is coupled to the at least one movable wall,
- wherein the control valve unit comprises a guide sleeve and an actuating piston which is guided displaceably in the control valve unit and which is actuatable by means of a force input member which is couplable to a brake pedal,
- wherein the actuating piston has at least one first valve seat which, in the opened state, serves for connecting the working chamber to the surrounding atmosphere,
- wherein the actuating piston has a first flow control portion, which projects in the direction of the guide sleeve, and the guide sleeve has a second flow control portion, which projects in the direction of the actuating piston, wherein the first flow control portion is formed on the actuating piston radially inwardly of the first valve seat;
- wherein the first flow control portion and the second flow control portion interact for controlling the air stream flowing to the first valve seat.
3 more elements
A vacuum brake booster comprising:
- at least one movable wall which separates a working chamber and a vacuum chamber in the vacuum brake booster from one another, and
- a control valve unit which is coupled to the at least one movable wall,
- wherein the control valve unit comprises a guide sleeve and an actuating piston which is guided displaceably in the control valve unit and which is actuatable by means of a force input member which is couplable to a brake pedal,
- wherein the actuating piston has at least one first valve seat which, in the opened state, serves for connecting the working chamber to the surrounding atmosphere,
- wherein the actuating piston has a first flow control portion, which projects in the direction of the guide sleeve, and the guide sleeve has a second flow control portion, which projects in the direction of the actuating piston, wherein the second flow control portion is tubular and receives the first flow control portion at least in certain portions;
- wherein the first flow control portion and the second flow control portion interact for controlling the air stream flowing to the first valve seat.
3 more elements
Dependencies are inferred from the claim text.