Combined vehicle brake

Patent metadata

Field	Value
Publication number	US-9316277-B2
Application number	US-201314427144-A
Country	US
Kind code	B2
Filing date	Sep 9, 2013
Priority date	Sep 17, 2012
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

A combined vehicle brake having a hydraulically actuable driving brake and an electromechanically actuable parking brake device. In a brake housing, a hydraulic operating pressure space is bounded by a brake piston chargeable with hydraulic pressure medium to carry out normal braking. The brake piston is actuable along a longitudinal axis of the piston, and the parking brake device acts on the brake piston by a gearing converting the rotational movement of an electromechanical actuator into a translation movement and bringing about an actuation of the brake piston in order to carry out parking brake operations and keeping the brake piston in the actuated position. The gearing has a threaded spindle and a threaded nut which are in contact with each other via a plurality of rolling bodies. The frictional moment transmitted by the further axial bearing is higher than the returning torque of the threaded spindle.

First claim

The invention claimed is:

1. A combined vehicle brake which has a hydraulically actuable service brake and an electromechanically actuable parking brake apparatus, a hydraulic service pressure space being delimited in a brake housing by a brake piston which can be loaded with hydraulic pressure medium in order to carry out service brake operations, with the result that the brake piston can be actuated along a piston longitudinal axis in order to achieve a braking action, and the parking brake apparatus acting on the brake piston ( 6 ) by a rotational/translational gear mechanism which is driven by an electromechanical actuator and brings about an actuation of the brake piston in order to carry out parking brake operations and stops in the actuated position, the rotational/translational gear mechanism having a threaded spindle and a threaded nut which are in contact with one another via a plurality of rolling bodies, and with an axial bearing, on which the threaded spindle is supported, wherein a further axial bearing is connected in series with the axial bearing, which further axial bearing acts only during the release operation of the parking brake apparatus and is designed in such a way that the frictional moment which is transmitted by the further axial bearing is higher than the retrodriving moment of the threaded spindle which is generated by the rotational/translational gear mechanism.

2. The combined vehicle brake as claimed in claim 1 , wherein the further axial bearing is formed by a first frictional face which is configured in the brake housing and a second frictional face which is configured on a torque transmission element which can be brought into force-transmitting connection with the threaded spindle.

3. The combined vehicle brake as claimed in claim 2 , wherein the first frictional face is configured on an annular disk.

4. The combined vehicle brake as claimed in claim 3 , wherein the first frictional face is provided on a wall which is configured in the brake housing, stands perpendicularly with respect to the threaded spindle and delimits the hydraulic service pressure space.

5. The combined vehicle brake as claimed in claim 3 , wherein the disk is composed of a plastic.

6. The combined vehicle brake as claimed in claim 3 , wherein the disk is produced from a metal.

7. The combined vehicle brake as claimed in claim 2 , wherein a mean frictional radius of the first frictional face corresponds to a mean rolling radius of the first axial bearing.

8. The combined vehicle brake as claimed in claim 2 , wherein the torque transmission element is of cup-shaped configuration and engages around a radial collar which is configured on the threaded spindle.

9. The combined vehicle brake as claimed in claim 8 , wherein a freewheel mechanism provided between the torque transmission element the radial collar.

10. The combined vehicle brake as claimed in claim 9 , wherein the freewheel mechanism configured as a ramp/rolling body arrangement.

11. The combined vehicle brake as claimed in claim 9 , wherein the freewheel mechanism is configured as a drag spring.

Assignees

• Continental Teves Ag & Co Ohg

Inventors

• Winkler Thomas
• Bauer Jürgen
• Balz Jürgen
• Pfeiffer Stefan
• Koch Dirk
• Böhme Thomas

Classifications

• F16D2123/00

  Multiple operation forces · CPC title

• F16D65/18 Primary

  adapted for drawing members together {, e.g. for disc brakes} · CPC title

• F16D2125/40

  Screw-and-nut · CPC title

• F16H25/2204

  with balls · CPC title

• F16D2121/04

  acting on a piston-type actuator, e.g. for liquid pressure · CPC title