SHIFTING SLEEVE SUPPORT

Abstract

A shifting sleeve support of a synchronisation device includes an outer toothing for meshing with a shifting sleeve and a groove, which interrupts the outer toothing. The groove has groove walls with an asymmetrical cross-section, and a groove bottom. The groove may form a pressure piece receptacle, a stop for the shifting sleeve, or a stop for a synchroniser ring, for example.

Claims

1.-8. (canceled)

9. A shifting sleeve support of a synchronisation device, comprising: an outer toothing for meshing with a shifting sleeve; and a groove, which interrupts the outer toothing, the groove comprising: groove walls having an asymmetrical cross-section; and a groove bottom.

10. The shifting sleeve support of claim 9, wherein the groove forms a pressure piece receptacle.

11. The shifting sleeve support of claim 9, wherein the groove forms a stop for the shifting sleeve.

12. The shifting sleeve support of claim 9, wherein the groove forms a stop for a synchroniser ring.

13. The shifting sleeve support of claim 9, wherein the groove walls have a same design in different longitudinal sections.

14. The shifting sleeve support of claim 9, wherein a groove base contour is designed as a curve that is asymmetrical in relation to a center of the groove bottom.

15. The shifting sleeve support of claim 9, wherein the groove walls form different angles with respect to the groove bottom.

16. The shifting sleeve support of claim 9, wherein the shifting sleeve support is sintered.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present disclosure is illustrated in more detail below by means of drawings based on exemplary embodiments. In the figures,

[0022] FIG. 1 shows a synchronisation device in longitudinal section,

[0023] FIG. 2 shows a shifting sleeve support according to the prior art in cross section,

[0024] FIG. 3 shows a simplified, schematic cross-sectional illustration of the groove of a shifting sleeve support according to the present disclosure.

DETAILED DESCRIPTION

[0025] FIG. 1 shows a synchronisation device 27 with a shifting sleeve support 1 and a shifting sleeve 2 for selectively coupling gear wheels 3 and 4. The gear wheels 3 and 4 are rotatable, but mounted in a fixed manner longitudinally on a transmission shaft 5. The shifting sleeve support 1 is rotationally fixed and longitudinally fixed on the transmission shaft 5 and carries the shifting sleeve 2 on its outer circumference. The shifting sleeve 2 is arranged on the shifting sleeve support 1 so as to be displaceable selectively in the direction of one of the gear wheels 3 or 4 and in a rotationally fixed manner relative to the shifting sleeve support 1 and thus to the transmission shaft 5 by means of a toothing. A set of synchroniser rings 13, 13′, 13″ is arranged on each side of the shifting sleeve support 1 longitudinally between the latter and the gear wheel 3, 4.

[0026] The shifting sleeve support 1 accommodates multiple detents 6 on its circumference, with a detent 6 only being shown schematically here. The detent 6 is designed as a pressure piece 9 and latches with its latching element 8 on the shifting sleeve 2 in its neutral setting position. In the neutral setting position, the detent 6 is supported radially on the shifting sleeve support 1 and is biased with a cover 10 against the shifting sleeve 2. The latching element 8 engages with its cover 10 in a latching recess 11.

[0027] If the shifting sleeve 2 is displaced axially, it engages in a clutch toothing 12a of a clutch disk 12 that is fixedly connected to the gear wheel 4. The transmission shaft 5 is connected for conjoint rotation with the gear wheel 4 via the shifting sleeve support 1 and the shifting sleeve 2, the gear associated with the gear wheel 4 being selected. During the shifting movement of the shifting sleeve 2 into the shifted position, the shifting sleeve 2 longitudinally takes along the latching element 8 of the detent 6, which engages in the latching recess 11, and displaces it against the outer synchroniser ring 13. This initiates the pre-synchronisation process.

The shifting sleeve 2, which is moved further in the direction of the clutch toothing 12a, forces the cover 10 of the pressure piece 9, which is supported on the outer synchroniser ring 13, out of the latching recess 11. The cover 10 deflects radially. When the gear is released, the shifting sleeve 2 moves back from this position. In this case, the cover 10 resting against the shifting sleeve 2 with bias engages again in the latching recess 11.

[0028] A shifting sleeve support 1 according to the prior art is shown in cross section in FIG. 2. It is designed as a one-piece hub and has an inner toothing 7 radially on the inside for rotationally fixed connection to the transmission shaft 5. A web 14 connects radially to the inner toothing 7 and connects the outer toothing 15 to the inner toothing 7. The outer toothing 15 is designed as a ring gear which is divided into individual toothed sections by six recesses in the form of grooves 16. Three of the grooves 16 constitute windows 17 for stops, not shown, arranged on the shifting sleeve 2. With an axial displacement of the shifting sleeve 2, the stops move in the grooves 16. The other three grooves 16 are designed as pressure piece windows 18. The pressure pieces 9 (FIG. 1) are arranged in them.

[0029] FIG. 3 shows a shifting sleeve support 1 according to the present disclosure with a groove 17 as a pressure piece window 18 for receiving a pressure piece 9. The groove 16 has two groove walls 19, 20, to each of which the groove bottom 21 is connected. The groove bottom 21 is composed of two partial surfaces 23, 24, each of which has a different curvature, so that the groove bottom is asymmetrical in order to relieve the web region 25 (FIG. 2) located in the direction of rotation 22. The curvature of the partial surfaces 23, 24 is not constant, as viewed in a cross-sectional plane over the groove bottom 21, but variable. The curvature of the partial surfaces 23, 24 also changes, viewed in a longitudinal section plane, over the groove bottom 21. The change in the curvatures of the partial surfaces 23, 24 does not take place in mirror-inverted manner, but independently of one another, it being ensured that the resulting groove bottom 21 is free of edges apart from the end faces of the shifting sleeve support 1.

[0030] The first groove wall 19 and the second groove wall 20 are each inclined at an angle to the center of the groove bottom 21, the two angles differing from one another.

REFERENCE NUMERALS

[0031] 1 Shifting sleeve support [0032] 2 Shifting sleeve [0033] 3 Gear Wheel [0034] 4 Gear wheel [0035] 5 Transmission shaft [0036] 6 Detent [0037] 7 Inner toothing [0038] 8 Latching element [0039] 9 Pressure piece [0040] 10 Cover [0041] 11 Latching recess [0042] 12 Clutch disc [0043] 12a Clutch toothing [0044] 13 Synchroniser ring [0045] 13′ Synchroniser ring [0046] 13″ Synchroniser ring [0047] 14 Web [0048] 15 Outer toothing [0049] 16 Groove [0050] 17 Window [0051] 18 Pressure piece window [0052] 19 Groove wall [0053] 20 Groove wall [0054] 21 Groove bottom [0055] 22 Direction of rotation [0056] 23 First partial surface [0057] 24 Second partial surface [0058] 25 Web region [0059] 26 Undercut [0060] 27 Synchronisation device