Selectively self-locking electromechanically and hydraulically actuated motor vehicle brake

Patent metadata

Field	Value
Publication number	US-10316914-B2
Application number	US-201415105121-A
Country	US
Kind code	B2
Filing date	Dec 15, 2014
Priority date	Dec 23, 2013
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

A motor vehicle brake, in particular a combined hydraulically and electromechanically actuated motor vehicle brake, comprising an actuator subassembly that includes: a brake housing, an actuation member, which is movable in relation to the brake housing, for hydraulically or electromechanically moving a brake lining, a motor-operated drive, a moving mechanism between the motor-operated drive and the movable actuation member, a gear train associated with the moving mechanism, and a separate self-locking device which is designed to block the moving mechanism as needed. The gear train includes at least two gear stages. The disclosed motor vehicle brake is characterized in that the self-locking device is arranged on the gear train in such a way that reactive forces of the self-locking device that occur during the self-locking action can be deflected into the brake housing via a force guiding member.

First claim

The invention claimed is:

1. A combined hydraulically and electromechanically operable motor vehicle brake having an actuator subassembly comprising:
a brake housing,
an actuation member which is movable in relation to the brake housing for hydraulically or electromechanically moving a brake lining,
a motor drive,
a displacement mechanism arranged between the motor drive and the movable actuation member,
a gear arrangement assigned to the displacement mechanism, and
a separate self-locking device, which is configured to block the displacement mechanism as needed,
wherein the gear train has at least two gear stages, wherein the self-locking device is arranged in or on the gear train in such a way that reactive forces occurring as part of the self-locking effect of the self-locking device are configured to be diverted into the brake housing by means of a force-conducting element, and
wherein the force conducting element is configured as a receptacle body, in which the self-locking device is accommodated at least in part, the receptacle body being coupled to the brake housing in a force-transmitting manner,
wherein the self-locking device is configured with a wrap spring clutch, which allows a transfer of torque from the motor drive to a spindle and is configured for blocking the transfer of torque from the spindle to the motor drive,
the receptacle body is configured as a hollow body and has at least one mounting flange, by means of which the receptacle body is coupled to the brake housing in a force-transmitting manner,
and the self-locking device is connected upstream from the gear stage of the gear train closest to the movable actuation member and is accommodated together with this gear stage in the receptacle body, and the wrap spring clutch is integrated into the receptacle body, wherein the gear stage accommodated in the receptacle body is a planetary gear, wherein the receptacle body is configured as a hollow wheel of the planetary gear.

2. The motor vehicle brake according to claim 1 , wherein the receptacle body is manufactured as deep-drawn part from a steel material.

3. The motor vehicle brake according to claim 1 , wherein the receptacle body has at least two lateral mounting brackets with mounting boreholes.

4. The motor vehicle brake according to claim 1 , wherein the displacement mechanism has a ball screw drive with a spindle and a nut, wherein one component of the spindle and the nut is configured to be optionally driven to rotation, and another component of the spindle and the nut is configured to be displaced linearly for displacement of the actuation member by rotational drives of the one component of the spindle and the nut inside the housing.

5. The motor vehicle brake according to claim 1 , wherein the gear train has three or four gear stages, wherein the self-locking device is arranged close to the movable actuation member inside the gear train.

6. The motor vehicle brake according to claim 5 , wherein a first gear stage and a second gear stage, each as spur gears, have a reduction ratio from the range between 4.4:1 and 6.6:1.

7. The motor vehicle brake according to claim 6 , wherein a third gear stage is configured as the planetary gear, which has a reduction ratio from the range between 6.4:1 and 8.6:1.

8. The motor vehicle brake according to claim 5 , characterized in that the actuator subassembly has a total reduction ratio from the range between 115:1 and 400:1.

9. The motor vehicle brake according to claim 1 , wherein a switch element, which is assigned to the wrap spring clutch, allows, in a first switch position, a transfer of torque from the spindle to the motor drive, and on reaching a second switch position, triggers the wrap spring clutch to block a transfer of torque from the spindle to the motor drive.

10. The motor vehicle brake according to claim 6 , wherein the reduction ratio is approximately 5.4:1.

11. The motor vehicle brake according to claim 7 , wherein the planetary gear reduction ratio is approximately 7.125:1.

12. The motor vehicle brake according to claim 8 , wherein the actuator subassembly total reduction ratio is approximately 208:1.

Assignees

• Lucas Automotive Gmbh

Inventors

• Loens Michael

Classifications

• F16D2121/24

  using motors · CPC title

• F16D55/226 Primary

  in which the common actuating member is moved axially {, e.g. floating caliper disc brakes} · CPC title

• B60T13/588

  both fluid and mechanical assistance or drive · CPC title

• F16D2125/48

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

• F16D2125/50

  with parallel non-stationary axes, e.g. planetary gearing · CPC title