Method of producing a sliding sleeve for a synchronous manual transmission assembly and sliding sleeve produced by means of the method

Abstract

A sliding sleeve for a synchronous manual transmission assembly is produced by the following steps: a tubular blank is provided in which an internal toothing arrangement is present, and the blank which is provided with the internal toothing arrangement is further processed to form a plurality of sliding sleeves.

Claims

1. A method of producing a sliding sleeve for a synchronous manual transmission assembly comprising the following steps: providing a tubular blank having a preformed internal toothing arrangement wherein the internal toothing arrangement is produced by cold pilgering rolling plastic deformation of the blank; further processing the blank to form a plurality of sliding sleeves; and wherein a pilger mandrel having different toothing pitches is utilized in the preforming of the internal toothing arrangement.

2. The method of claim 1 wherein the blank is formed of a metal alloy.

3. The method of claim 2 wherein the blank is formed of a case-hardened steel or a carbon steel.

4. The method of claim 1 wherein, after the internal toothing arrangement is introduced, the blank is subdivided into individual segments which are provided with an outer contour.

5. The method of claim 4 wherein the segments are cut-off from the blank.

6. The method of claim 4 wherein the outer contour is introduced by a machining procedure.

7. The method of claim 4 wherein the outer contour is introduced by plastic deformation.

8. The method of claim 4 wherein the outer contour is produced by attaching at least one component.

9. The method of claim 4 wherein the internal toothing arrangement is sharpened.

10. The method of claim 4 wherein the internal toothing arrangement is undercut.

11. The method of claim 4 wherein the sliding sleeve is thermally treated.

12. The method of claim 1 wherein the blank has an outer contour subdivided into individual segments introduced by a machining procedure.

13. The method of claim 1 wherein the blank has an outer contour subdivided into individual segments introduced by plastic deformation.

14. The method of claim 1 wherein the blank has an outer contour subdivided into individual segments produced by attaching at least one component.

15. A method of producing a sliding sleeve for a synchronous manual transmission assembly comprising the steps of: providing a tubular blank having a preformed internal toothing arrangement having teeth which are associated with different toothing arrangements, and further processing the blank to form a plurality of sliding sleeves; wherein the teeth of the different toothing arrangements differ in terms of tooth width, tooth height, modulus, or tooth profile.

16. The method of claim 15 wherein the blank has an outer contour subdivided into individual segments introduced by a machining procedure.

17. The method of claim 15 wherein the blank has an outer contour subdivided into individual segments introduced by plastic deformation.

18. A method of producing a sliding sleeve for a synchronous manual transmission assembly comprising the steps in sequence of: providing a tubular blank having a preformed internal toothing arrangement produced by cold pilgering, after the internal toothing arrangement is introduced, providing the blank with an outer contour in sections, and then subdiving the blank into individual segment; and wherein the outer contour is produced by attaching at least one component.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will be described hereinafter with reference to an embodiment which is illustrated in the accompanying drawings, in which:

(2) FIG. 1 schematically shows a synchronous manual transmission assembly comprising a sliding sleeve;

(3) FIG. 2 schematically shows a first step of a method in accordance with the invention;

(4) FIG. 3 schematically shows a second step of a method in accordance with the invention;

(5) FIG. 4 shows a perspective truncated view of a blank after completion of the second method step;

(6) FIG. 5 shows a sectional view of the blank of FIG. 4;

(7) FIG. 6 shows an enlarged view of a detail of a section of FIG. 5;

(8) FIG. 7 schematically shows a third method step;

(9) FIG. 8 schematically shows a further processing step; and

(10) FIG. 9 shows a schematic, perspective view of a completed sliding sleeve.

DETAILED DESCRIPTION OF THE INVENTION

(11) The production of a sliding sleeve 12, as can be used in a synchronous manual transmission assembly shown in FIG. 1, will be explained hereinafter with reference to FIGS. 2 to 9.

(12) In a first step, a blank 12R is provided which is a tube consisting of a metal alloy, in particular case-hardened steel or carbon steel. The tube is seamless. If the blank 12R is a tube comprising a smooth inner surface or is a tube whose inner profiling does not correspond to the internal toothing arrangement of the sliding sleeve to be produced, the blank 12R is provided with an internal toothing arrangement 14R in a second method step. For this purpose, the blank 12R is plastically deformed.

(13) The blank 12R is dimensioned in such a manner that after the subsequent further processing steps the sliding sleeve is produced with the desired dimensions.

(14) In one embodiment (see FIG. 3), the second method step consists of cold-pilgering the blank 12R. For this purpose, a pilger mandrel 30 and a plurality of schematically illustrated rollers 32 are used. The pilger mandrel is provided on its outer circumferential surface with a toothing arrangement 34 which has different pitches corresponding to the toothing arrangement to be produced.

(15) By repeatedly moving the blank 12R with the pilger mandrel 30 in a reciprocating manner between the rollers 32 and by suitably advancing the rollers 32, the blank 12R is deformed such that it has on its inner surface a continuous internal toothing arrangement 14R (possibly apart from the beginning and end portions of the blank 12R).

(16) FIG. 4 shows the blank 12R after completion of the second method step. The continuous toothing arrangement 14R on the inner side can be clearly seen.

(17) As is apparent in particular from FIGS. 5 and 6, the internal toothing arrangement 14R has different toothing arrangements, i.e. a repeating pattern of teeth which differ in terms of their tooth width, their tooth height, their modulus and/or their tooth profile. By way of example, reference is made in this case to the teeth 38, 40, 42, wherein the teeth 38, 40 differ in terms of the tooth width and also their profile and the teeth 38, 40 differ with respect to the tooth 42 in terms of the tooth height.

(18) FIG. 7 schematically illustrates how the blank 12R, after being provided with the internal toothing 14R, is subdivided into individual sliding sleeve segments 12S. In the illustrated exemplified embodiment, the segments 12S are cut off using a turning tool 44.

(19) FIG. 8 schematically shows a step for further processing a cut-off segment 12S. The further processing step consists in this case of producing an outer contour which subsequently can be engaged by a component with which the sliding sleeve 12 can be displaced in the axial direction for the purpose of gear-shifting. In the example of FIG. 8, the outer contour is machined to form the outer circumference using a turning tool 46.

(20) The further processing can also consist of the segment 12S being plastically deformed on its outer side such that a suitable outer contour is produced. For example, a groove can be rolled in. It is also possible to deform the material such that it curves radially outwards in specific regions.

(21) The further processing can also consist of a separate component (e.g. a ring) or a plurality of separate components (e.g. a plurality of lugs) being attached, e.g. welded, soldered or shrink-fitted on the outer surface of the segment 12S. As a result, an outer contour can also be produced which can be engaged by e.g. a shift fork.

(22) Alternatively, the desired outer contour can also be produced at suitable locations on the blank 12R before the blank is subdivided into the individual segments 12S.

(23) Further processing steps consist of the internal toothing 14 being post-processed. For example, it can be sharpened at the axial ends or can also be undercut in the vicinity of the axial ends.

(24) The post-processing of the internal toothing arrangement can also consist of providing the apertures 29 for the mid-centring 28.

(25) Further processing steps can consist of thermally treating, in particularly hardening, the sliding sleeve.

(26) FIG. 9 shows a completed sliding sleeve 12 which, on its outer circumference, is provided with the outer contour in the form of a groove 13.