Rack-and-pinion steering system for motor vehicles

• US 10,689,023 B2
• Filed: 07/15/2015
• Issued: 06/23/2020
• Est. Priority Date: 09/22/2014
• Status: Active Grant

• Current Assignee: TRW Automotive GmbH (Apollo Global Management, Inc.)
• Original Assignee: TRW Automotive GmbH (Apollo Global Management, Inc.)
• Inventors: Span, Eduard, Kolloch, Robert, Nilgen, Nadja, von Laar, Rolf
• Primary Examiner(s): MacArthur, Victor L
• Application Number:
  US15/510,244
• Publication Number:
  US 20170297608A1
• Time in Patent Office: 1,805 Days
• Field of Search: 74 29, 74 8911, 74422, 280 93514
• CPC Class Codes: B62D 3/12 of rack-and-pinion type
• CPC Class Codes: B62D 3/126 characterised by the rack
• CPC Class Codes: F16H 19/04 comprising a rack
• CPC Class Codes: F16H 2019/046 Facilitating the engagement or stopping of racks

Abstract

A rack-and-pinion steering for a motor vehicle, having a rack which has a longitudinal axis, a rack housing in which the rack is guided for axial displacement, and at least one end stop damping assembly for the rack, the end stop damping assembly being received in the rack housing, the end stop damping assembly including a compression body for damping an end stop and a stop member which is mounted to the rack housing for limited displacement in the axial direction, the stop member resting against a first supporting surface of the rack housing at least partly by means of the compression body in a first axial direction and resting against a second supporting surface of the rack housing in an opposite, second axial direction.

Claims

1. A rack-and-pinion steering for a motor vehicle, comprising

a rack having a longitudinal axis,

a rack housing in which the rack is guided for axial displacement between two end stops which are formed in the rack housing and wherein the rack housing comprises a first supporting surface and a second supporting surface, and

at least one end stop damping assembly for the rack, the end stop damping assembly being received in the rack housing,

the end stop damping assembly including a compression body for damping a movement of the rack-and-pinion steering to one of the two end stops and a stop member, the stop member being mounted to the rack housing for limited displacement in a first axial direction and/or a second axial direction in relation to the rack housing, and

the stop member resting against the first supporting surface of the rack housing at least partly by means of the compression body in a first axial end position,

wherein the stop member rests against the second supporting surface of the rack housing in an opposite, second axial end position,

wherein the compression body is received in an axial depression in the front face of the stop member and projects axially beyond the stop member.

2. The rack-and-pinion steering according to claim 1, wherein the stop member is a contact ring which, in an axial end stop position of the rack-and-pinion steering, comes into contact on a front face thereof with the rack.

3. The rack-and-pinion steering according to claim 1, wherein the stop member includes detent elements and produces a detent connection with the rack housing.

4. The rack-and-pinion steering according to claim 3, wherein the rack housing has a cylindrical opening for receiving the rack, the opening having at least one radial recess formed therein into which the decent elements of the stop member extend.

5. The rack-and-pinion steering according to claim 4, wherein the radial recess in the opening of the rack housing is formed as a circular groove, and a groove flank of the groove constitutes the second supporting surface.

6. The rack-and-pinion steering according to claim 1, wherein an axial displacement of the stop member in the mounted condition is limited by the first supporting surface or the second supporting surface of the rack housing.

7. The rack-and-pinion steering according to claim 1, wherein at least one of the first supporting surface and the second supporting surface extends substantially perpendicularly to the longitudinal axis.

8. The rack-and-pinion steering according to claim 1, wherein the stop member in the mounted condition is axially pretensioned against the second supporting surface by the compression body.

9. The rack-and-pinion steering according to claim 1, wherein the stop member is configured as an auxiliary support and limits a bending of the rack.

10. The rack-and-pinion steering according to claim 1, wherein the stop member is fixed within the rack housing substantially non-rotationally in relation to the longitudinal axis.

11. The rack-and-pinion steering according to claim 1, wherein the stop member is a plastic ring.

12. The rack-and-pinion steering according to claim 1, wherein the compression body and the stop member are formed to be ring-shaped and are arranged concentrically with the longitudinal axis.

13. The rack-and-pinion steering according to claim 12, wherein an inside diameter of the ring-shaped stop member is smaller than an inside diameter of the ring-shaped compression body.

14. The rack-and-pinion steering according to claim 1, wherein the compression body is made from an elastomer.

15. The rack-and-pinion steering according to claim 1, wherein the compression body is connected with the stop member by at least one of a frictional connection, an adhesive bond and a detent connection.