CN115289209A

CN115289209A - Sliding sleeve

Info

Publication number: CN115289209A
Application number: CN202210472004.4A
Authority: CN
Inventors: C·克龙贝格尔; M·奥勒
Original assignee: Miba Sinter Austria GmbH
Current assignee: Miba Sinter Austria GmbH
Priority date: 2021-05-04
Filing date: 2022-04-29
Publication date: 2022-11-04
Also published as: AT524424A4; AT524424B1; DE102022110166A1

Abstract

The invention relates to a sliding sleeve (4) comprising a sliding sleeve body (5) having a first and a second circumferential surface (8, 9), wherein at least one engagement element, in particular a toothing, for engaging a further component is provided on the first circumferential surface (8), and an engagement groove (10) for an actuating element (11) is provided on the second circumferential surface (9), wherein the engagement groove (10) is defined by groove side walls (14, 15) extending in a circumferential direction (12) of the sliding sleeve body (5), which are interrupted in the circumferential direction (12).

Description

Sliding sleeve

Technical Field

The invention relates to a sliding sleeve comprising a sliding sleeve body having a first circumferential surface and a second circumferential surface, wherein at least one engagement element, in particular a toothing, for engaging a further component is provided on the first circumferential surface, and an engagement groove for an actuating element is provided on the second circumferential surface, which engagement groove is delimited by groove flanks extending in the circumferential direction of the sliding sleeve body.

The invention also relates to an E-shaft for a vehicle, said E-shaft comprising a sliding sleeve.

The invention further relates to a method for producing a sliding sleeve, according to which a green body having a sliding sleeve body, which has a first circumferential surface and a second circumferential surface, is pressed from metal powder in a die using an upper punch and a lower punch, wherein at least one engagement element for engaging a further component, in particular a toothing, is produced on the first circumferential surface, after which the green body is sintered.

Furthermore, the invention relates to an apparatus for pressing a green compact for a sliding sleeve according to the invention from a metal powder, the apparatus comprising: a die having a die cavity for receiving a powder to be pressed; a mandrel disposable within the die; an upper punch and a lower punch arranged to be sunk into the die in a pressing direction.

Background

Sliding sleeves, which are often also referred to in the literature as shift sleeves, are known in transmissions for establishing a functional connection of a gear wheel with a drive train. For this purpose, the sliding sleeve has an internal toothing on the inside. Sliding sleeves are used not only in conventional motor vehicles with internal combustion engines, but also in so-called hybrid drives or purely electric drives, as is carried out, for example, in DE 10 2019 056a 1.

The production of sliding sleeves by means of powder metallurgy is known, for example, from WO 2010/141972 A2. Here, a metal powder is pressed into a green body and the green body is sintered. Furthermore, an annular groove for engaging a shift fork is produced by cutting on the outer circumferential surface.

Disclosure of Invention

The aim of the invention is to simplify the production of a sliding sleeve, in particular to provide a sliding sleeve for an E-axis which is easy to produce.

This object is achieved with the sliding sleeve mentioned at the outset in that the groove flanks are interrupted in the circumferential direction.

The object of the invention is also achieved with the initially mentioned E-shaft with a sliding sleeve according to the invention.

The object of the invention is also achieved by the method mentioned at the outset, wherein, during the production of the green body, an engagement groove for the actuating element is formed on the second circumferential surface, for which purpose a web for forming a first groove flank is formed on the sliding sleeve body, after which a part of the first groove flank is moved in the axial direction with the upper punch and the lower punch, so that the engagement groove is delimited by a broken groove flank extending in the circumferential direction of the sliding sleeve body.

In addition, the object of the invention is achieved with the device mentioned at the outset in that the upper punch has a cylindrical upper punch part and one or more upper punch fingers which are adjustable relative to the cylindrical upper punch part in the pressing direction, in that the lower punch has a cylindrical lower punch part and one or more lower punch fingers which are adjustable relative to the cylindrical lower punch part in the pressing direction, wherein the one or more upper punch fingers and the one or more lower punch fingers are each arranged in line with one another in the pressing direction, and in that the die has a groove-shaped recess on the inner wall for guiding the one or more upper punch fingers and the one or more lower punch fingers in the pressing direction.

It is advantageous here that the sliding sleeve can be produced by extrusion techniques, i.e. that no additional machining operations are required after sintering in order to produce the sliding sleeve groove. In connection with this, the process time for manufacturing the sliding sleeve can be reduced, which is associated with corresponding cost advantages. In addition, the tool costs for such a machining operation are therefore also eliminated. In contrast, the processing of the extruded part in the press mold can be carried out relatively simply, since the extruded part is also relatively soft compared to the sintered sliding sleeve.

According to one embodiment variant of the invention, it can be provided that the groove flank has a plurality of wall sections spaced apart from one another in the course of its circumferential direction or is produced with a plurality of wall sections spaced apart from one another. By dividing the groove side walls into a plurality of wall sections, individual sections can be constructed shorter, whereby the movement of the powder in the die can be carried out more simply.

In order to improve this effect, according to a further embodiment variant of the invention, it can be provided that the wall section has a length in the circumferential direction of the sliding sleeve body which is between 100% and 1000% of the wall thickness of the wall section in the axial direction of the sliding sleeve body.

According to a further embodiment variant of the invention, it can be provided that the wall section of the groove flank in the circumferential direction of the sliding sleeve body is longer or is configured to be longer than the wall section of the second groove flank in the circumferential direction of the sliding sleeve body. The groove side wall can therefore be given greater mechanical stability for engaging the shift fork.

In this case, it is advantageous according to a further embodiment variant of the invention to make longer the wall sections of the groove side walls which are moved in the axial direction during the production of the green body in order to form the groove, since the wall parts to be moved can therefore also have a higher stability, as a result of which the proportion of waste during powder pressing can be reduced.

According to a further embodiment variant of the invention, it can be provided that the engagement groove extends in the circumferential direction only over a partial region of the sliding sleeve body. This is advantageous in particular if the sliding sleeve is arranged rotationally fixed, since the proportion of powder to be displaced in the die can be reduced since the engagement position of the shift fork or the shift element remains unchanged. Thus, the method can also be carried out more simply. Furthermore, tool costs can be reduced due to the simpler pressing tool.

In order to increase the mechanical stability of the sliding sleeve, it can be provided according to a further embodiment variant of the invention that, in the partial region of the sliding sleeve body adjoining the engagement groove, a groove-free annular web portion is formed in the circumferential direction.

In order to improve this effect, it can be provided according to one embodiment variant that the annular web section has a width in the axial direction of the sliding sleeve body that is equal to the width of the engagement groove plus the wall thickness of the associated groove side wall. Furthermore, the production of the sliding sleeve itself can also be simplified by this design, since the geometry of the stamp can be designed more simply.

According to a further embodiment variant of the invention, it can be provided that the distances between wall sections arranged one behind the other in the circumferential direction have different sizes. With this embodiment variant, a large-area contact area for the shift fork or the shift element on the groove side wall can be defined more easily, wherein the contact area can be produced with greater mechanical stability.

In order to also improve the mechanical stability of at least one of the groove flanks, in particular of the groove flanks produced by displacing the powder in the other groove flank, it can be provided according to an embodiment variant of the invention that the wall section is designed at an angle selected from the range of 60 ° to 130 ° relative to the circumferential surface carrying the wall section.

As already mentioned above, the sliding sleeve is preferably used for the E-axis, wherein the sliding sleeve is mounted in a rotationally fixed manner. This can reduce the wear characteristics or allow higher tolerances in the region of the sliding sleeve groove, which can further simplify the production of the sliding sleeve.

In order to guide the upper punch finger more precisely, it can be provided according to an embodiment variant of the device that the upper punch has an annular upper punch part which at least partially surrounds the cylindrical upper punch part.

Drawings

For a better understanding of the invention, it is explained in more detail with the aid of the following figures.

In each case, the following are shown in simplified schematic form:

fig. 1 shows a part of an assembly with a sliding sleeve in oblique view in section;

fig. 2 shows an embodiment variant of the sliding sleeve in an oblique view;

fig. 3 shows a further embodiment variant of the sliding sleeve in an oblique view;

fig. 4 shows an apparatus for producing a green body for a sliding sleeve in oblique section;

fig. 5 shows a detail of the device according to fig. 4 after the formation of the engagement groove of the sliding sleeve.

Detailed Description

It should be noted at the outset that in the differently described embodiments, identical components are provided with the same reference numerals or the same component names, wherein the disclosure contained throughout the description may be transferred in a meaningful manner to identical components having the same reference numerals or the same component names. The positional references (for example, upper, lower, lateral, etc.) selected in the description also relate to the direct description and to the illustrated drawings, and in the event of a change in position, these should be transferred in the sense to the new position.

Fig. 1 shows the assembly 1 in oblique section. The assembly 1 comprises a first toothed element 2, in particular a first gearwheel, having an external toothing and a second toothed element 3, in particular a second gearwheel, having an external toothing. Above the two toothed elements 2, 3, a sliding sleeve 4 is arranged. The sliding sleeve 4 has a sliding sleeve body 5, on the inner circumferential surface of which an inner toothing 6 is formed. The internal toothing 6 is designed for engagement with the external toothing of the two toothing elements 2, 3. Accordingly, the geometry of the inner toothing is adapted to the geometry of the outer toothing. By moving the sliding sleeve 4 in the axial direction 7 of the assembly 1, the sliding sleeve 4 can be moved between a decoupling position, in which the two toothed elements 2, 3 are not actively connected to one another, and a coupling position, in which the two toothed elements 2, 3 are coupled to one another (shown in fig. 1).

The sliding sleeve 4 and thus the component 1 are in particular a component of a so-called E-shaft.

The E-shaft, which combines the individual components of the drive, in particular the electric motor, the power electronics, the axle and the transmission, into a unit which directly drives the vehicle axle, is an important component of the motor vehicle (with a hybrid drive or an all-electric drive). Since the E-axis is known per se from the prior art, reference should be made to the prior art for further details.

The sliding sleeve 4 can be used, for example, for coupling an electric drive in a hybrid vehicle to a drive train. In an all-electric drive, the sliding sleeve can also be used to shift between the gear positions of the transmission. The sliding sleeve 4 can be used in a transmission or assembly 1 having a plurality of gear wheels or toothed elements 2, 3, for selectively coupling the toothed elements 2, 3 to one another or one of the toothed elements 2, 3 to another. Other application purposes are likewise conceivable.

Fig. 2 shows a first embodiment variant of the sliding sleeve 4 in an oblique view. The sliding sleeve 4 in turn has a sliding sleeve body 5. The sliding sleeve body has a first circumferential surface 8 and a second circumferential surface 9. In particular, the sliding sleeve body 5 is cylindrically configured.

In the embodiment variant shown in detail, the first circumferential surface 8 is an inner circumferential surface 8 of the sliding sleeve body 5, and the second circumferential surface 9 is an outer circumferential surface 9 of the sliding sleeve body.

The inner toothing 6 is formed on the first circumferential surface 8 of the sliding sleeve 4 according to fig. 1. The first circumferential surface 8 can generally have at least one engagement element for engaging into or for engaging into a further component (e.g. a toothing element 2, 3 according to fig. 1). However, the at least one engagement element can also be embodied differently, wherein, however, the displaceability of the sliding sleeve 4 in the axial direction 7 is to be maintained.

While the second circumferential surface 9 has an engagement groove 10 into which an actuating element 11 (see fig. 1) for actuating or displacing the sliding sleeve 4 in the axial direction 7 can engage. The actuating element 11 can be, for example, a shift fork or an actuator.

This embodiment of the first and second

peripheral surfaces

8, 9 of the sliding sleeve 4 is preferred. However, the arrangement can also be reversed, so that the internal toothing 6 can also be an external toothing. In this embodiment variant, for the following embodiment, the first peripheral face 8 becomes the outer peripheral face 8, and the second peripheral face 9 becomes the inner peripheral face 9. In the following, only the first embodiment will be examined further. However, these embodiments can also be adapted accordingly to the second embodiment variant with the external toothing of the sliding sleeve 4.

The engagement groove 10 extends in the circumferential direction 12 of the sliding sleeve body 5 and has a (clear) width 13 in the axial direction 7. The width 13 can be adapted to the width of the engagement section of the actuating element 11 engaging in the engagement groove 10 in this direction or greater than said width.

The scarf groove 10 is defined by a first groove side wall 14 and a second groove side wall 15. The two

groove side walls

14, 15 extend in the circumferential direction 12. The two groove side walls project beyond the second circumferential surface 9 of the sliding sleeve body 5, in particular in the radial direction 16. In particular, the two

groove side walls

14, 15 start at the circumferential surface 9 and have a height 17.

As can be seen from fig. 2, the groove flanks 14, 15 do not extend continuously over their entire length (in particular in the circumferential direction 12), but are rather configured to be interrupted. In the embodiment variant of the two

groove side walls

14, 15 shown in fig. 1, the first groove side walls 14 each have a plurality of first wall sections 18 (also referred to as first wall sections) spaced apart from one another, and the second groove side walls 15 each have a plurality of second wall sections 19 (also referred to as second wall sections) spaced apart from one another.

The first wall section 18 can be arranged or designed to start next to the first end face 20 of the sliding sleeve body 5. While the second wall section 19 is arranged or designed to be displaced in the axial direction 7 in the course of the second circumferential surface 9. However, it is also possible for the second wall section 19 to be arranged or formed so as to start next to the second end face 21 of the sliding sleeve body 5. Furthermore, the first wall section 18 can also be arranged or formed in the course of the second circumferential surface 9 so as to be displaced in the axial direction 7, i.e. spaced apart from the first end surface.

As can be seen from fig. 2, the second wall sections 19 are arranged offset in the circumferential direction 12 from the first wall sections 18, to be precise in each case in alignment in the axial direction 7 with first recesses 22 in the first groove flank 14, which are formed by a spacing from the first wall sections 18. Correspondingly, second recesses 23 formed in the second groove flank 15 by the spacing of the second wall sections 19 are arranged in alignment in the axial direction 7.

The two

trough side walls

14, 15 preferably have the same height 17. The height 17 may, for example, be between 50% and 500% of the wall thickness 24 of the sliding sleeve body 5.

Preferably, all first and

second wall sections

18, 19 have the same height 17. However, it is also possible for one or more of the first and

second wall sections

18, 19 to have a smaller or larger height 17 than the remaining

wall sections

18, 19, for which purpose the pressing tool for producing the green body of the sliding sleeve can be designed accordingly.

According to a further embodiment variant of the sliding sleeve 4, it can be provided that the first wall section 18 has a length 25 in the circumferential direction 12 of the sliding sleeve body 5 which is between 100% and 1000%, in particular between 300% and 800%, of the wall thickness 26 of the first wall section 18 in the axial direction 7 of the sliding sleeve body 5.

The second wall section 19 can likewise have a length 27 in the circumferential direction 12 of the sliding sleeve body 5, which length 27 is between 100% and 1000%, in particular between 300% and 800%, of the wall thickness 28 of the second wall section 19 in the axial direction 7 of the sliding sleeve body 5.

All first and

second wall sections

18, 19 may have the

same length

25, 27. However, it is also possible for the first wall section 18 to be longer or shorter than the second wall section 19. Furthermore, it can be provided that the first wall sections 18 have different lengths 25 from one another and/or that the second wall sections 19 have different lengths 27 from one another.

According to one embodiment variant of the sliding sleeve 4, it can be provided, for example, that the distances between the first and/or

second wall sections

18, 19 arranged one after the other in the circumferential direction differ, i.e. that the first recesses 23 and/or the second recesses 24 differ in length in the circumferential direction 12.

According to a further embodiment variant of the sliding sleeve 4, it can be provided that the

wall section

18 or 19 of the

groove flank

14 or 15 is longer in the circumferential direction 12 of the sliding sleeve body 5 than the

wall section

19 or 18 of the

second groove flank

15 or 14 in the circumferential direction 12 of the sliding sleeve body 5. Fig. 3 shows a variant of this embodiment of the sliding sleeve 4. The second wall section 19 is longer in the circumferential direction 12 than the first wall section 18.

In general, it can be provided that the first wall section 18 or at least individual first wall sections of the first wall sections 18 have a length 25 in the circumferential direction 12 of between 50% and 500% of the length 27 of the second wall section 19, or that the second wall section 19 or at least individual second wall sections of the second wall sections 19 have a length 27 in the circumferential direction 12 of between 50% and 500% of the length 25 of the first wall section 18.

The reference point for the

different lengths

25, 27 is preferably the

wall section

18 or 19 of the

groove side wall

14, 15, respectively, having the

smallest length

25 or 27.

Furthermore, according to a further embodiment variant of the sliding sleeve 4, it can be provided that the first wall section 18 (or at least the respective first wall section 18) and/or the second wall section 19 (or at least the respective second wall section 19) and/or the first wall section 18 (or at least the respective first wall section 18) have a different wall thickness 26 than the second wall section 19 (or at least the respective second wall section 18). This can be produced, for example, by extruding the

wall sections

18, 19 with different strengths.

In the embodiment variant of the sliding sleeve 4 shown in fig. 2, the engagement groove 10 extends over the entire circumference of the sliding sleeve body 5 in the circumferential direction 12. As can be seen from fig. 3, according to one embodiment variant of the sliding sleeve 4, it can also be provided that the engagement groove 10 extends only over a partial region of the entire circumference of the sliding sleeve body 5. The engagement groove 10 may extend, for example, only over a partial region of between 5% and 90%, in particular between 10% and 50%, preferably between 10% and 30%, of the entire circumference of the sliding sleeve body 5.

Although only one second wall section 19 is shown in fig. 3, in this embodiment variant the second groove side wall 15 can also have two or more second wall sections 19.

It is also possible to arrange or form the arrangement shown in fig. 3, which is formed by the first and

second wall sections

18, 19, so as to be distributed a plurality of times, in particular uniformly, over the circumference of the sliding sleeve body 5.

Furthermore, the first trough side wall 14 can also have only one first wall section 18 or more than two first wall sections 18.

According to a further embodiment variant of the sliding sleeve 4, it is provided that a plurality of, for example two to six, partial regions are formed distributed, in particular uniformly distributed, over the circumference of the sliding sleeve body 5, in which partial regions an engagement groove 10 is present, which has one or more first wall sections 18 and one or more second wall sections 19. All partial regions can be formed identically. However, at least one of the plurality of partial regions may be configured differently from the remaining partial regions.

According to a further embodiment variant of the sliding sleeve 4 shown in fig. 3, it can be provided that in the partial region of the sliding sleeve body 5 adjoining the engagement groove 10, a non-grooved annular strip section 29 is formed in the circumferential direction 12. In the case of a plurality of partial regions, it can also be provided that the engagement groove 10 and the annular bead segment 29 are arranged alternately.

The annular bead segment 29 is preferably connected directly to the engagement groove 10, so that the first or

second wall segment

18, 19 of each end of the engagement groove 10 is connected to the annular bead segment 29. However, it is also possible for the annular bead segments 29 or individual or all annular bead segments 29 to be arranged at a distance from the engagement groove 10 or engagement grooves 10.

According to a further embodiment variant of the sliding sleeve 4, it can be provided that the annular strip section 29 has a width 30 in the axial direction 7 of the sliding sleeve body 5 which is equal to the width 13 of the engagement groove 10 plus the wall thickness 26 of the associated

groove flank

14, 15.

In principle, however, the annular strip section 29 can also have a width 30 which is smaller or larger than the width 13 of the engagement groove 10 plus the wall thickness 26 of the associated

groove side wall

14, 15.

Individual or all

wall sections

18, 19 may be angled at 90 ° to the second circumferential surface 9. However, within the scope of the invention, according to a further embodiment variant of the sliding sleeve 4, it can be provided that at least one side of the wall section 18 and/or at least one side of the wall section 19 is/are formed at an angle 31, selected from the range of 60 ° to 130 °, to the circumferential surface 9 supporting the wall section. The individual or all first wall sections 18 and/or the individual or all second wall sections 19 can thus be undercut or, for example, have a trapezoidal cross section (as indicated by the dashed lines in fig. 3) or the like. The angles 31 at which the side faces of the wall section are inclined relative to the second circumferential surface 9 can differ from one another.

Furthermore, the transitions between the surfaces adjoining one another can be configured as a rounding or a chamfer.

As mentioned before, the sliding sleeve 4 is preferably used for the E-axis. In this case, according to one embodiment variant of the E-axis, the sliding sleeve 4 can be mounted in a rotationally fixed manner, for example, connected to the housing of the E-axis.

The sliding sleeve 4 is manufactured using a powder metallurgy process. Since the process itself is well described in the literature, it is not necessary to explain this in detail. It should only be mentioned that the method comprises the following steps: providing a metal sintering powder, pressing the powder into a green body in a powder press, and sintering in a single or multiple step.

The pressing of the powder is performed by means of a device 32 for pressing the green body 33, which may also be referred to as a pressing tool. Fig. 4 shows a variant embodiment of the device 32 in part. In particular, this embodiment variant of the device 32 is provided for producing a green body 33 for the sliding sleeve 4 according to fig. 2.

A green body 33 in the sense of the present invention is understood to be a shaped part which is pressed from the sintering powder in a stage immediately after the pressing of the sintering powder in the respective press and before sintering, in accordance with the common usage of technical terms. The green body 33 is thus a blank from which the (finished) sliding sleeve 4 is formed by sintering.

The apparatus 32 comprises an upper punch 34 and a lower punch 35.

The upper punch 35 comprises a cylindrical upper punch part 36 and one or more upper punch fingers (Oberstempelfinger) 38 which are adjustable relative to the upper punch part 36 in the pressing direction 37, or consists of a first upper punch part 36 and at least one upper punch finger 38.

The upper punch fingers 38 may be individually (operably) arranged. However, it is also possible for the upper punch fingers 38 to form a single further upper punch part with the base body, not shown in detail, the upper punch fingers 38 projecting from the base body in the pressing direction 37.

The end surfaces 39 of the upper punch member 36 and the end surfaces 40 of the upper punch fingers 38 form the pressing surfaces of the upper punch 36.

The upper punch member 36 preferably has a slot 42 on the outer peripheral surface 41 for each upper punch finger 38. The slots 42 are used to receive and guide the upper punch fingers 38 as the green body is pressed. Preferably, the upper punch fingers 38 do not project in the radial direction from the upper punch member 36, but engage the peripheral surface 41.

According to an embodiment variant of the device 32, in order to better guide the upper punch fingers 38 when pressing the green body, an annular further upper punch part 43 can be provided, which at least partially (over a partial section) surrounds the cylindrical upper punch part 36. The annular further upper punch member 43 is preferably directly connected to the die 44 of the device 32. The annular further upper punch head 43 can be configured to be internally smooth as long as the upper punch fingers 38 are in flat engagement with the upper punch head 36.

The arrangement and distribution of the grooves 42 in the circumferential surface 41 corresponds to the arrangement and distribution of the second wall sections 19 of the sliding sleeve 4.

The shape of the upper punch member 36 generally depends on the geometry or shape of the sliding sleeve 4 to be manufactured. The upper punch part 36 or generally the upper punch 36 according to fig. 4 should therefore be regarded as an example and may have a different geometry or shape than this.

The lower punch 35, which corresponds to the upper punch 34, is configured to fit the upper punch 34 and accordingly has a cylindrical lower punch part 45 and one or more lower punch fingers 46. Unlike the upper punch 34, however, the lower punch member 45 has a wall thickness 47 that is smaller than the wall thickness 48 of the upper punch member 36 by the height 17 (see fig. 2) of the

wall sections

18, 19.

For each upper punch finger 38, a lower punch finger 46 is provided in the lower punch 35, which is arranged in the extension of the respective upper punch finger 38 and spaced apart therefrom. The distance between the upper punch fingers 38 and the lower punch fingers 46 depends here on the

wall thickness

26 or 28 of the

wall sections

18, 19 to be produced.

For guiding the at least one lower punch finger 46, at least one corresponding groove is provided in the die 44, which groove is (respectively) arranged or configured in connection with the groove 42 of the upper punch part 36 and is aligned with the groove of the upper punch part in the pressing direction 37. The geometry of the slot of the die 44 preferably corresponds to the geometry of the slot 42 of the upper punch member 36.

After the one or more lower punch fingers 46 may be guided in the die 44, the outer peripheral surface 49 of the lower punch member 45 may be smoothly configured. If necessary, however, it is also possible to form a groove/grooves on the circumferential surface 49 in sections for receiving the lower punch finger/fingers 46, provided that the groove/grooves do not interfere with the sinking of the lower punch 35 into the die 44.

Like the upper punch fingers 38, the lower punch fingers 46 may also form a separate lower punch member integral with the base body, the lower punch fingers 46 projecting from the base body in the pressing direction 37.

As can be seen from fig. 4, the upper punch 34 is preferably arranged to also sink into the die 44. For this purpose, the stamp 44 has a cross-sectional widening in the region facing the upper punch 34. Alternatively, the upper punch 34 may also be disposed in flush engagement with the die 44.

In order to form the internal toothing 6 of the sliding sleeve, a mandrel 50 is provided, which is inserted into the die 44 or is arranged therein and has a corresponding external toothing 51. Since the core rod 50 is preferably configured to be longer than the green body 33 in the pressing direction 37, the upper punch 34 and the lower punch 35 have corresponding inner

toothed sections

52, 53 which can accommodate the outer toothed sections 51 of the core rod 50.

The mandrel 50 can also be longer than shown in the extrusion direction 37.

The die 44 forms a die cavity together with the lower punch 35 and with the core rod 50.

To produce the green body 33, the powder is now filled into the mold cavity of the press mold. For this purpose, the relative position of the core rod 50 and the lower punch 35 relative to the die 44 is determined in advance, i.e. the corresponding distance of sinking of the lower punch 35 and the core rod 50 into the die 44.

It should be mentioned here that the device 32 for producing the green body 33 for the sliding sleeve 4 can have conventional means, such as holders, moving means for the punch and/or die 43, drives, etc., as are conventional for such presses for producing powder-metallurgical components. To avoid repetition, reference should therefore be made to the relevant prior art for this purpose.

The powder used for producing the green body 33 may be, for example, sintered steel powder as known from the prior art. The powder is preferably filled up to the upper edge of the core rod 50. For this purpose, the upper end face of the core rod 50 is preferably set at the same height as the upper end face of the die 44.

The lower punch finger or fingers 38 are arranged with their pressing surface below the upper end face of the die 44 and at the level of the cross-sectional widening 54 of the die, i.e. flush with said cross-sectional widening, so that in this region an annular die cavity section is formed without a break.

After filling the die cavity, the upper punch 34 is lowered with the upper punch fingers 38 also engaging flush with the end face 39 of the upper punch 34. The filled powder is compacted into a green body 33 by this closing of the die cavity and further relative adjustment of the upper punch 34 in the pressing direction 37 with respect to the lower punch 35.

The lower punch 35 may also be moved upwardly to compact the powder, if desired.

To construct the wall section 19, one or more upper punch fingers 38 move downwardly with/in synchronism with one or more lower punch fingers 46. During the downward movement of the fingers, the powder contained therebetween moves from the plane of the wall sections 18 downward into a second plane different from the first plane, so that an engagement groove 10 is formed between the

wall sections

18, 19. During movement, the lower punch fingers 44 support powder disposed between the upper punch fingers 38 and the lower punch fingers 44.

Alternatively, the powder can also be moved before pressing the powder. In this case, the upper punch 34 and/or the lower punch 35 also perform a short reciprocating linear movement downwards and/or upwards after moving the powder downwards in the pressing direction 37. The upper punch fingers 38 or the lower punch fingers 44 preferably no longer change their relative position with respect to the upper punch piece 36 or the lower punch piece 45. Alternatively or additionally, however, the upper punch fingers 38 and the lower punch fingers 44 may then be moved toward one another as needed to effect additional compaction. It is also possible here for only individual ones of the plurality of upper and

lower punch fingers

38, 44 to be moved towards each other in order to produce wall sections 19 of different thicknesses.

After the compaction of the powder is completed, the green body 33 may be ejected. To this end, the upper punch 34 is moved upwards and/or the die 44 is moved downwards, so that the die cavity of the die 44 is released. Thereafter, the green body 33 may be discharged by an upward movement of the lower punch 35 and/or a subsequent downward movement of the die 44.

Preferably, a stationary die 44 is utilized for processing.

Within the scope of the invention, the opposite movement embodiment is also possible, i.e. the wall section 18 is manufactured by moving part of the powder upwards.

As already mentioned, the wall sections 18 can also be arranged or formed in positions which are not used for the illustration in fig. 4 and 5. For this purpose, the cross-sectional extensions 54 of the stamp 44 can be formed further offset downward/inward. For this purpose, the upper punch part 36 can also have a cross-sectional enlargement, in particular a region with a wall thickness corresponding to the height 17 of the wall section 18. In this case, the upper punch part 36 also sinks further into the die 44 in this region.

As can also be seen from fig. 5, the wall section 19 can have a side wall course which is offset by 90 ° from the circumferential surface 9 at least in regions. This may apply to all side walls of the

wall sections

18, 19.

These examples show possible embodiment variants of the sliding sleeve 4 or of the device 32 for producing the green body 33, wherein it should be noted here that a combination of the individual embodiment variants with one another is also possible.

For the sake of clarity, it is finally pointed out that the sliding sleeve 4 or the device 32 for producing the green body 33 is not necessarily shown to scale for a better understanding of the construction.

List of reference numerals

1. Assembly

2. Toothed element

3. Toothed element

4. Sliding sleeve

5. Sliding sleeve body

6. Internal toothing

7. Axial direction

8. Peripheral surface

9. Peripheral surface

10. Scarf groove

11. Actuating element

12. In the circumferential direction

13. Width of

14. Trough side wall

15. Trough side wall

16. Radial direction

17. Height

18. Wall section

19. Wall section

20. End face

21. End face

22. Voids

23. Voids

24. Wall thickness

25. Length of

26. Wall thickness

27. Length of

28. Wall thickness

29. Annular batten segment

30. Width of

31. Angle of rotation

32. Device

33. Green body

34. Upper punch

35. Lower punch

36. Upper punch head part

37. Direction of extrusion

38. Upper punch finger

39. End face

40. End face

41. Peripheral surface

42. Trough

43. Upper punch head part

44. Pressing die

45. Lower punch component

46. Lower punch finger

47. Wall thickness

48. Wall thickness

49. Peripheral surface

50. Core rod

51. External tooth

52. Internal toothing

53. Internal tooth system

54. Cross-sectional expansion

Claims

1. Sliding sleeve (4) comprising a sliding sleeve body (5) having a first circumferential surface (8) and a second circumferential surface (9), wherein at least one engagement element, in particular a toothing, for engaging a further component is provided on the first circumferential surface (8), and an engagement groove (10) for an actuating element (11) is provided on the second circumferential surface (9), the engagement groove (10) being defined by groove side walls (14, 15) extending in a circumferential direction (12) of the sliding sleeve body (5), characterized in that the groove side walls (14, 15) are interrupted in the circumferential direction (12).

2. Sliding sleeve (4) according to claim 1, characterised in that the groove side wall (14, 15) has in its course in the circumferential direction (12) a plurality of wall sections (18, 19) spaced apart from one another.

3. Sliding sleeve (4) according to claim 2, characterised in that the wall sections (18, 19) have a length (25, 27) in the circumferential direction (12) of the sliding sleeve body (5) of between 100% and 1000% of the wall thickness (26) of the wall sections (18, 19) in the axial direction (7) of the sliding sleeve body (5).

4. Sliding sleeve (4) according to one of claims 1 to 3, characterised in that the wall section (18 or 19) of one groove side wall (14 or 15) is longer in the circumferential direction (12) of the sliding sleeve body (5) than the wall section (19 or 18) of a second groove side wall (15 or 14) in the circumferential direction (12) of the sliding sleeve body (5).

5. The sliding sleeve (4) as claimed in one of claims 1 to 4, characterized in that the engagement groove (10) extends in the circumferential direction only over a partial region of the sliding sleeve body (5).

6. The sliding sleeve (4) as claimed in claim 5, characterised in that, in the partial region of the sliding sleeve body (5) which connects to the engagement groove (10), a groove-free annular strip section (29) is formed in the circumferential direction (12).

7. The sliding sleeve (4) as claimed in claim 6, characterised in that the annular strip section (29) has a width (30) in the axial direction (7) of the sliding sleeve body (5) which is equal to the width (13) of the engagement groove (10) plus the wall thickness (26) of the associated groove flank (14, 15).

8. Sliding sleeve (4) according to one of claims 2 to 7, characterised in that the distances between wall sections (18, 19) arranged one after the other in the circumferential direction (12) have different sizes.

9. Sliding sleeve (4) according to one of claims 2 to 8, characterised in that the wall sections (18, 19) are configured at an angle (31) selected from the range of 60 ° to 130 ° with respect to the circumferential surface (9) on which they are carried.

10. E-shaft for a vehicle, comprising a sliding sleeve (4), characterized in that the sliding sleeve (4) is formed according to one of claims 1 to 9.

11. E-shaft according to claim 10, characterised in that the sliding sleeve (4) is fitted non-rotatably.

12. Method for producing a sliding sleeve (4), according to which a green body (33) having a sliding sleeve body (5) with a first circumferential surface (8) and a second circumferential surface (9) is pressed from metal powder in a press die (44) with an upper punch (34) and a lower punch (35), wherein at least one engagement element for engaging further components, in particular a toothing, is produced on the first circumferential surface (8), and the green body (33) is thereafter sintered, characterized in that an engagement groove (10) for a handling element (11) is formed on the second circumferential surface (9) during the production of the green body (33), for which purpose a web for forming a first groove side wall (18) is formed on the sliding sleeve body (5), after which a part of the first groove side wall (18) is moved in the axial direction (7) with the upper punch (34) and the lower punch (35), so that the engagement groove (10) is defined by a circumferential break-off groove wall (15) extending in the sliding sleeve body (5) in the circumferential direction (12).

13. Method according to claim 12, characterized in that the groove flank (14, 15) is produced with a plurality of wall sections (18, 19) spaced apart from one another in its course in the circumferential direction (12).

14. Method according to claim 12 or 13, characterized in that the wall section (18 or 19) of one groove side wall (14 or 15) is designed longer in the circumferential direction (12) of the sliding sleeve body (5) than the wall section (19 or 18) of a second groove side wall (15 or 14) in the circumferential direction (12) of the sliding sleeve body (5).

15. Method according to claim 14, characterized in that the wall sections (19) of the groove side walls (15) which are moved in the axial direction (7) during the production of the green body (33) to form the scarf groove (10) are made longer.

16. Apparatus (32) for pressing a green body (33) from a metal powder for a sliding sleeve (4) according to one of claims 1 to 9, comprising: a die (44) having a die cavity for receiving a powder to be pressed; a mandrel (50) disposable within the die (44); -an upper punch (34) and a lower punch (35) which are arranged so as to be sunk into the die (44) in a pressing direction (37), characterized in that the upper punch (34) has a cylindrical upper punch part (36) and one or more upper punch fingers (37) which are adjustable in the pressing direction (37) relative to the cylindrical upper punch part (36), that the lower punch (35) furthermore has a cylindrical lower punch part (45) and one or more lower punch fingers (46) which are adjustable in the pressing direction (37) relative to the cylindrical lower punch part (45), that the one or more upper punch fingers (38) and the one or more lower punch fingers (36) are each arranged in alignment with one another in the pressing direction (37), and that the die (44) has a groove-shaped clearance on the inner wall for guiding the one or more upper punch fingers (38) and the one or more lower punch fingers (46) in the pressing direction (37).

17. Apparatus according to claim 16, wherein the upper punch (34) has, for guiding the one or more upper punch fingers (38), an annular upper punch head part (43) which at least partially surrounds the cylindrical upper punch head part (36).