FREE-WHEELING DEVICE FOR AN AUTOMATIC GEARBOX

Abstract

The disclosure relates to a free-wheeling device for an automatic gearbox, for example, of a motor vehicle. The device may include a rotatable inner ring and a stationary fixed outer ring, and a cage which is arranged radially between the inner ring and the outer ring for receiving clamping bodies.

The outer ring may include at least a supporting ring and a securing ring which is arranged radially on an outer circumferential face of the supporting ring and connected rotationally fixedly to the supporting ring. The supporting ring may be provided to absorb tangential forces, and the securing ring may have a plurality of radial formations on an outer circumferential face for stationary fixing of the outer ring.

Claims

1. A free-wheeling device for an automatic gearbox of a motor vehicle, comprising a rotatable inner ring and a stationary fixed outer ring, and a cage which is arranged radially between the inner ring and the outer ring for receiving clamping bodies, wherein the outer ring includes at least a supporting ring and of a securing ring which is arranged radially on an outer circumferential face of the supporting ring and connected rotationally fixedly to the supporting ring, the supporting ring being configured to absorb tangential forces, and wherein the securing ring has a plurality of radial formations on an outer circumferential face for stationary fixing of the outer ring.

2. The free-wheeling device as claimed in claim 1, wherein the securing ring formed as one piece and comprises two ring discs which are axially connected together via the plurality of radial formations.

3. The free-wheeling device as claimed in claim 1, wherein the securing ring is produced without cutting.

4. The free-wheeling device as claimed in claim 3, wherein the securing ring is produced by punching, bending and welding of a metal sheet.

5. The free-wheeling device as claimed in claim 1, wherein the securing ring is connected to the supporting ring by substance bonding.

6. The free-wheeling device as claimed in claim 1, wherein the outer ring has a ramp ring arranged radially on an inner circumferential face of the supporting ring for provision of a running surface for the clamping bodies, wherein the ramp ring is connected rotationally fixedly to the supporting ring

7. The free-wheeling device as claimed in claim 6, wherein the ramp ring is produced without cutting.

8. The free-wheeling device as claimed in claim 6, wherein the ramp ring is case-hardened.

9. The free-wheeling device as claimed in claim 6, wherein the ramp ring is connected to the supporting ring by an interference fit.

10. A free-wheeling device for an automatic gearbox, comprising: a rotatable inner ring and a fixed outer ring; a cage arranged radially between the inner ring and the outer ring and configured to receive clamping bodies; the outer ring including at least a supporting ring and a securing ring, the securing ring arranged radially on an outer circumferential face of the supporting ring and connected rotationally fixedly to the supporting ring; and the supporting ring being configured to absorb tangential forces and the securing ring having a plurality of radial formations on an outer circumferential face for fixing of the outer ring.

11. The free-wheeling device as claimed in claim 10, wherein the securing ring is formed as one piece and comprises two ring discs which are axially connected together via the plurality of radial formations.

12. The free-wheeling device as claimed in claim 10, wherein the securing ring is connected to the supporting ring by substance bonding.

13. The free-wheeling device as claimed in claim 10, wherein the outer ring has a ramp ring arranged radially on an inner circumferential face of the supporting ring for provision of a running surface for the clamping bodies, wherein the ramp ring is connected rotationally fixedly to the supporting ring.

14. The free-wheeling device as claimed in claim 13, wherein the ramp ring is case-hardened.

15. The free-wheeling device as claimed in claim 13, wherein the ramp ring is connected to the supporting ring by an interference fit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Further measures improving the disclosure are described in more detail below together with the description of example embodiments of the disclosure with reference to the figures. The drawings show:

[0017] FIG. 1 is a diagrammatic sectional view to illustrate the structure of a free-wheeling device according to the disclosure, comprising an outer ring formed from a supporting ring and a securing ring, and

[0018] FIG. 2 is a diagrammatic exploded view to illustrate the structure of a free-wheeling device according to the disclosure, comprising an outer ring formed from a supporting ring, a securing ring and a ramp ring.

DETAILED DESCRIPTION

[0019] According to FIG. 1, a free-wheeling device according to the disclosure for an automatic gearbox of a motor vehicle has a rotatable inner ring 1 and a stationary fixed outer ring 2, and a cage 3 arranged radially between the inner ring 1 and the outer ring 2 for receiving clamping bodies (not shown here). The outer ring 2 consists of a supporting ring 2a and a securing ring 2b which is arranged radially on an outer circumferential face of the supporting ring 2a and connected rotationally fixedly to the supporting ring 2a. Here, the supporting ring 2a is provided to receive tangential forces. In contrast, the securing ring 2b has a plurality of radial formations 5 arranged on an outer circumferential face for stationary fixing of the outer ring 2.

[0020] The supporting ring 2a and the securing ring 2b may be connected together by substance bonding, in such as by welding. Furthermore, the securing ring 2b may be produced without cutting, in particular by punching, bending and welding of a metal sheet. In contrast, the supporting ring 2a may be formed solidly and may be made of a hardenable steel material. In particular, a forged blank may be suitable for production of the supporting ring 2a. A running surface for the clamping bodies is provided on an inner circumferential face of the supporting ring 2a. To increase the wear resistance, the supporting ring 2a, or at least the running surface for the clamping bodies on the supporting ring 2a, may be hardened.

[0021] According to FIG. 2, the outer ring 2 may include a supporting ring 2a, a securing ring 2b and a ramp ring 2c. The securing ring 2b is here arranged radially on an outer circumferential face of the supporting ring 2a and connected rotationally fixedly to the supporting ring 2a. Furthermore, the ramp ring 2c is arranged radially on an inner circumferential face of the supporting ring 2a and connected rotationally fixedly to the supporting ring 2a. For each clamping body 4 arranged in the cage 3, a respective ramp 8 is formed on an inner circumferential face of the ramp ring 2c and serves as a running surface for the respective clamping body 4. Furthermore, the ramp ring 2c may be produced without cutting, may be case-hardened and may be connected to the supporting ring 2a by interference fit, such as by a press joint. Furthermore, the securing ring 2b may be formed as one piece and comprises two ring discs 6a, 6b which are axially connected together via the plurality of radial formations 5. Thus a recess 7 is arranged axially between the two ring discs 6a, 6b, wherein the radial formations 5 serve as axial bridges between the two ring discs 6a, 6b and are provided for stationary fixing of the outer ring 2.

LIST OF REFERENCE NUMERALS

[0022] 1 Inner ring

[0023] 2 Outer ring

[0024] 2a Supporting ring

[0025] 2b Securing ring

[0026] 2c Ramp ring

[0027] 3 Cage

[0028] 4 Clamping body

[0029] 5 Radial formation

[0030] 6a, 6b Ring disc

[0031] 7 Recess

[0032] 8 Ramp