Sub-assembly for an electromechanical brake actuator

Patent metadata

Field	Value
Publication number	US-9145939-B2
Application number	US-201013518531-A
Country	US
Kind code	B2
Filing date	Jul 23, 2010
Priority date	Dec 23, 2009
Publication date	Sep 29, 2015
Grant date	Sep 29, 2015

Abstract

The invention relates to a subassembly for a brake actuator which is provided for an electromechanically operated parking brake. The subassembly comprises a drive device and gear device for generating and transmitting a torque to a brake device and a fixing element which secures the arrangement of the gear device relative to the drive device, an internal-toothed wheel of the gear device being integrated in the fixing element.

First claim

The invention claimed is:

1. A subassembly for an electromechanical brake actuator, the subassembly being constructed so as to be received in a housing, comprising:
a drive device which comprises an electric motor in order to generate a torque;
a gear device for transmitting and delivering the torque to a brake device; and
a fixing element which is constructed separately from the housing of the subassembly and which fixes the position of the gear device relative to the drive device, the fixing element being constructed integrally with an internal-toothed wheel of the gear device;
wherein the fixing element is constructed as a carrier element which connects the drive device and the gear device to each other.

2. The subassembly for an electromechanical brake actuator according to claim 1 , wherein the carrier element connects the drive device and the gear device in order to form a unit.

3. The subassembly for an electromechanical brake actuator according to claim 1 , the drive device being arranged at a first end of the fixing element.

4. The subassembly for an electromechanical brake actuator according to claim 1 , the internal-toothed wheel of the gear device being constructed at a second end of the fixing element.

5. The subassembly for an electromechanical brake actuator according to claim 1 , wherein the fixing element has a plate-shaped base member.

6. The subassembly for an electromechanical brake actuator according to claim 1 , wherein the fixing element has an opening for receiving the drive device.

7. The subassembly for an electromechanical brake actuator according to claim 1 , wherein the fixing element is constructed with the internal-toothed wheel as a cast component.

8. The subassembly for an electromechanical brake actuator according to claim 1 , wherein the internal-toothed wheel is part of a planet gear of the gear device, components of the planet gear being able to be introduced into the internal-toothed wheel.

9. The subassembly for an electromechanical brake actuator according to claim 8 , the internal-toothed wheel comprising at least one internally toothed wheel ring, at least one torque-transmitting planet wheel carrier of the gear device having a plurality of planet wheels thereon being able to be introduced into the internal-toothed wheel.

10. The subassembly for an electromechanical brake actuator according to claim 9 , wherein the at least one planet wheel carrier can be fixed to the internal-toothed wheel by means of a retention element.

11. The subassembly for an electromechanical brake actuator according to claim 8 , wherein the torque transmission from the drive device to a sun wheel of the planet gear is brought about by a toothed wheel arrangement.

12. The subassembly for an electromechanical brake actuator according to claim 11 , wherein the toothed wheel arrangement is supported on the fixing element.

13. The subassembly for an electromechanical brake actuator according to claim 12 , wherein a centering element is fitted to the fixing element.

14. The subassembly for an electromechanical brake actuator according to claim 13 , wherein the centering element secures the toothed wheel arrangement at the upper side.

15. A subassembly for an electromechanical brake actuator comprising:
a drive device which comprises an electric motor in order to generate a torque; and
a gear device which successively comprises a first, a second and a third gear stage for transmitting the torque, the third gear stage being constructed as a planet gear, and an output-side gear element of the second gear stage and a sun wheel of the planet gear being fitted to a planet wheel carrier of the third gear stage via a first gear shaft, which sun wheel is arranged in a torque-locking and concentric manner with respect to the gear element, the first gear shaft being received at the first end thereof on a centering element and/or at the second end thereof on the planet wheel carrier of the third gear stage, the centering element constructed separately from a housing of the subassembly, wherein the housing covers at least a section of the centering element receiving the first gear shaft.

16. The subassembly for an electromechanical brake actuator according to claim 15 , the first gear shaft being connected to the planet wheel carrier of the third gear stage in a rotationally secure manner.

17. The subassembly for an electromechanical brake actuator according to claim 15 , the centering element comprising a bearing for receiving the first gear shaft.

18. The subassembly for an electromechanical brake actuator according to claim 15 , the centering element and a fixing element for fixing the drive device being constructed and arranged relative to each other in such a manner that they form a cage structure for receiving gear components.

19. The subassembly for an electromechanical brake actuator according to claim 18 , an internal-toothed wheel of the gear device being constructed integrally with the fixing element.

20. The subassembly for an electromechanical brake actuator according to claim 15 , the first gear shaft being arranged centrally on the planet wheel carrier of the third gear stage.

21. The subassembly for an electromechanical brake actuator according to claim 15 , bearing shafts for receiving planet wheels further being provided on the planet wheel carrier of the third gear stage.

22. The subassembly for an electromechanical brake actuator according to claim 15 , the first gear shaft being rotatably supported at its first end on the centering element.

23. The subassembly for an electromechanical brake actuator according to claim 15 , the second gear stage being constructed as a planet gear and the output-side gear element of the second gear stage being constructed as a planet wheel carrier.

24. The subassembly for an electromechanical brake actuator according to claim 23 , the first gear shaft further receiving in a supporting manner a sun wheel of the second gear stage and an output-side gear element of the first gear stage connected to the sun wheel in a torque-locking manner.

25. The subassembly for an electromechanical brake actuator according to claim 23 , the two planet gear stages being arranged one after the other along the first gear shaft.

26. The subassembly for an electromechanical brake actuator according to claim 15 , further comprising a second gear shaft for receiving gear components of the first gear stage, the second gear shaft being received at a first end in the centering element and at a second end in a fixing element.

27. The subassembly for an electromechanical brake actuator according to claim 26 , the second gear shaft being rotatably supported at a first end on the centering element and at a second end on the fixing element, respectively.

28. The subassembly for an electromechanical brake actuator according to claim 15 , the planet wheel carrier and the first gear shaft being constructed integrally.

Assignees

• Giering Wilfried
• Lucas Automotive Gmbh

Inventors

• Giering Wilfried

Classifications

• F16H1/46

  Systems consisting of a plurality of gear trains each with orbital gears, {i.e. systems having three or more central gears} · CPC title

• F16D65/18 Primary

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

• F16D2125/50

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

• F16D2121/24

  using motors · CPC title

• F16D2125/48

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