Electric drum brake system having a rationalized electric parking brake actuator

Patent metadata

Field	Value
Publication number	US-10654460-B2
Application number	US-201615774824-A
Country	US
Kind code	B2
Filing date	Dec 5, 2016
Priority date	Dec 10, 2015
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A novel, particularly rationally designed, modular parking brake actuator for an electric drum brake system. An axle A 1 from the motor, including a screw gear pinion coupled in a rotationally fixed manner, and an axle of the spindle arrangement, including a screw gear which is coupled in a rotationally fixed manner to the drive nut, define under a deflection of 90° a single wheel gearbox stage of the parking brake actuator.

First claim

The invention claimed is:

1. An electric drum brake system with a parking brake actuator for a motor vehicle, wherein the parking brake actuator is arranged on an outer side of an anchor plate and, in a state of rotational drive, drives a drive nut which is supported rotatably and axially fixedly on the anchor plate, which drive nut drives a spindle, which is mounted in a rotationally secured and axially displaceable manner in a gearing housing, of a spindle arrangement, which spindle engages by an actuation cable on at least one brake shoe such that the latter can perform an actuation movement in a direction of a brake drum or can perform a release movement in an opposite direction, and having at least one electrical interface for an electrical human-machine interface and/or for an electronic control unit, wherein an axis A 1 along a motor shaft of the motor with a helical wheel pinion coupled rotationally conjointly to the free motor shaft end and an axis A 2 of the spindle arrangement including helical wheel coupled rotationally conjointly to the drive nut are arranged approximately at right angles with respect to one another and, with an axis spacing X with respect to one another, define a helical-wheel gearing stage of the parking brake actuator, and wherein the gearing housing comprises a gearing housing lower shell and a gearing housing cover, the gearing housing lower shell formed from a continuous piece which (i) includes the at least one electrical interface; (ii) accommodates the motor, motor shaft, and spindle arrangement; and (iii) defines the axis spacing X between axis A 1 and axis A 2 .

2. The electric drum brake system with the parking brake actuator for a motor vehicle as claimed in claim 1 , wherein the axis A 1 is oriented vertically and perpendicularly with respect to a wheel axis of rotation D.

3. The electric drum brake system with the parking brake actuator for a motor vehicle as claimed in claim 1 , wherein the axis A 2 is oriented in a skewed manner with respect to the wheel axis of rotation D and in a skewed manner with respect to the anchor plate, and wherein the actuation cable is diverted in a curved fashion along a three-dimensional curve R at least on the inner side of the anchor plate and is otherwise arranged so as to be led substantially horizontally.

4. The electric drum brake system with the parking brake actuator for a motor vehicle as claimed in claim 1 , wherein all interfaces relating to at least a hydraulic supply and electrical cables, for the drum brake are arranged in a bundled fashion within one semicircular sector, which is arranged above the wheel axis of rotation D, of the anchor plate.

5. The electric drum brake system with the parking brake actuator for a motor vehicle as claimed in claim 1 , wherein the parking brake actuator comprises a single multi-wheel gearing stage.

6. The electric drum brake system with the parking brake actuator for a motor vehicle as claimed in claim 1 , wherein the parking brake actuator comprises a cantilevered mounting of the helical wheel pinion based on the motor shaft mounting in the gearing housing.

7. The electric drum brake system with the parking brake actuator for a motor vehicle as claimed in claim 6 , wherein the motor shaft mounting comprises at least one rolling bearing which accommodates both radial and axial thrust forces.

8. The electric drum brake system with the parking brake actuator for a motor vehicle as claimed in claim 1 , wherein the motor shaft mounting and the mounting of the spindle arrangement in the gearing housing comprise at least two rolling bearings in a fixed bearing arrangement, which transmit both axial forces and radial forces.

9. The electric drum brake system with the parking brake actuator for a motor vehicle as claimed in claim 8 , wherein at least one rolling bearing is received and fixed with a bearing outer ring in a seat in a receptacle of a lower shell of the gearing housing, such that radial force components and axially directed thrust force components from the tooth meshing are introduced directly into the lower shell.

10. The electric drum brake system with parking brake actuator for a motor vehicle as claimed in claim 1 , wherein at least one rotation prevention means is provided between the motor and the gearing housing.

11. The electric drum brake system with parking brake actuator for a motor vehicle as claimed in claim 10 , wherein a positively locking rotation prevention means comprises at least one projection on the gearing housing, the at least one projection engages into an associated recess of the motor.

12. The electric drum brake system with parking brake actuator for a motor vehicle as claimed in claim 1 , wherein the motor is separately assigned, in the region of the helical-wheel gearing, a centering frame which is supported in the gearing housing.

13. The electric drum brake system with parking brake actuator for a motor vehicle as claimed in claim 1 , wherein the free motor shaft end is assigned an emergency bearing in the gearing housing lower shell.

14. The electric drum brake system with parking brake actuator for a motor vehicle as claimed in claim 13 , wherein the emergency bearing is formed, diametrically opposite a tooth meshing point of the helical-wheel gearing, from a plastics material as a unipartite motor shaft receptacle of the gearing housing lower shell.

15. The electric drum brake system with parking brake actuator for a motor vehicle as claimed in claim 14 , wherein a lubricant reservoir is provided in the gearing housing lower shell in the region of the emergency bearing.

16. The electric drum brake system with parking brake actuator for a motor vehicle as claimed in claim 13 , wherein a lubricant reservoir is provided in the gearing housing lower shell in the region of the emergency bearing.

Assignees

• Continental Teves Ag & Co Ohg

Inventors

• Winkler Thomas
• Balz Jürgen
• Froschauer Marco
• Bauer Jürgen
• Walter Patrick
• Heinz Stefan
• Merkel Philipp
• Bijanzadeh Pejman

Classifications

• F16D51/24

  fluid actuated · CPC title

• F16D65/22

  adapted for pressing members apart {, e.g. for drum brakes} · CPC title

• F16D2121/04

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

• F16D51/28

  mechanically actuated · CPC title

• F16H2025/209

  using worm gears · CPC title