Motor Vehicle Brake, In Particular A Motor Vehicle Brake That Can Be Actuated In A Combined Hydraulic And Electromechanical Manner, Comprising A Multi-Stage Spindle

Patent metadata

Field	Value
Publication number	US-2016355169-A1
Application number	US-201515117937-A
Country	US
Kind code	A1
Filing date	Feb 17, 2015
Priority date	Feb 19, 2014
Publication date	Dec 8, 2016
Grant date	—

Abstract

The invention relates to a motor vehicle brake, in particular a motor vehicle brake that can be actuated in a combined hydraulic and electromechanical manner, having an actuator assembly comprising: a housing, an actuating element that can be displaced relative to the housing along a longitudinal axis for the hydraulic or electromechanical displacement of a brake lining, a motor drive, and a displacement mechanism, arranged between the motor drive and the displaceable actuating element, for displacing the actuating element. The displacement mechanism has a multi-stage spindle-nut arrangement comprising a first spindle-nut pair having a first thread pitch and a second spindle-nut pair having a second thread pitch, wherein the first thread pitch is greater than the second thread pitch, wherein, during an electromechanical actuation of the motor vehicle brake, the first spindle-nut pair is active in a first actuating phase and the second spindle-nut pair is active in a second actuating phase.

First claim

1 . A motor vehicle brake adapted to be actuated in a combined hydraulic and electromechanical manner, having an actuator assembly comprising:
a housing, an actuating element that is displaceable relative to the housing along a longitudinal axis for a hydraulic or electromechanical displacement of a brake lining, a motor drive, and a displacement mechanism, situated between the motor drive and the actuating element, for displacing the actuating element, wherein the displacement mechanism has a multi-stage spindle-nut arrangement comprising a first spindle-nut pair having a first thread pitch and a second spindle-nut pair having a second thread pitch, wherein the first thread pitch is larger than the second thread pitch, wherein, during an electromechanical actuation of the motor vehicle brake, the first spindle-nut pair is active in a first actuating phase and the second spindle-nut pair is active in a second actuating phase, and
wherein the second spindle-nut pair has a second spindle and a second nut, the second nut being coupleable to the actuating element in a rotatably fixed manner, and the second spindle being rotatably drivable by the motor drive,
wherein second nut of the second spindle-nut pair has two parts, a first nut section being coupled in a rotatably fixed manner to a second nut section via a connecting pin, but being displaceable relative to the second nut section in an axial direction, the first nut section and the second nut section being stretched apart from one another in the axial direction via a compression spring mechanism.

2 . The motor vehicle brake according to claim 1 , wherein the transition from the first actuating phase to the second actuating phase is determined by an axial force threshold value acting on the actuating element.

3 . The motor vehicle brake according to claim 2 , wherein the axial force threshold value is dimensioned such that during the first actuating phase, the actuating element is displaceable for passing through a brake clearance, and during the second actuating phase, the actuating element is displaceable for building up a desired brake force.

4 . The motor vehicle brake according to claim 1 ,
wherein the first spindle-nut pair has a first spindle and a first nut, the first nut being rotatably fixed relative to the actuating element, and the first spindle being rotatably drivable by the motor drive.

5 . The motor vehicle brake according to claim 2 , wherein an axial elastic force exerted by the compression spring mechanism is dimensioned for stretching apart the first and second nut sections for setting the axial force threshold value.

6 . The motor vehicle brake according to claim 1 ,
wherein the first spindle of the first spindle-nut pair is coupled in a rotatably fixed manner to the second nut section of the second nut of the second spindle-nut pair, or is formed in one piece with same.

7 . The motor vehicle brake according to claim 1 ,
wherein the first spindle-nut pair has a self-locking design or a ball screw drive.

8 . The motor vehicle brake according to claim 1 ,
wherein the second spindle-nut pair has a self-locking design.

9 . The motor vehicle brake according to claim 1 , wherein a multi-stage gear system, situated between the motor drive and the spindle-nut arrangement, is associated with the displacement mechanism.

10 . The motor vehicle brake according to 1 ,
wherein the first spindle-nut pair has a first spindle and a first nut, the first nut being accommodated in the actuating element in a rotatably fixed manner or formed in one piece therewith, and the first spindle being rotatably drivable by the motor drive.

11 . The motor vehicle brake according to claim 7 ,
wherein the self-locking design is configured as a tapered thread or trapezoidal thread.

12 . The motor vehicle brake according to claim 8 ,
wherein the self-locking design is configured as a tapered thread or a trapezoidal thread.

Assignees

• Lucas Automotive Gmbh

Inventors

• Ohlig Benedikt
• Michels Erwin

Classifications

• F16D2125/40

  Screw-and-nut · CPC title

• F16D2125/405

  with differential thread · CPC title

• B60T13/741 Primary

  acting on an ultimate actuator · CPC title

• F16D2123/00

  Multiple operation forces · CPC title

• F16D2125/48

  with parallel stationary axes, e.g. spur gears · CPC title