WO2014161546A1

WO2014161546A1 - Coupling body for a synchronisation device of a motor vehicle

Info

Publication number: WO2014161546A1
Application number: PCT/DE2014/200155
Authority: WO
Inventors: Valerie Mandon; Reinhard Ammon; Reiner Martin; Mehmet Oezsoy
Original assignee: Schaeffler Technologies Gmbh & Co. Kg
Priority date: 2013-04-05
Filing date: 2014-04-04
Publication date: 2014-10-09
Also published as: CN105102838A; DE102013206079B3; CN105102838B

Abstract

The invention relates to a coupling body (1, 31) for a synchronisation device of a motor vehicle, comprising a substantially annular main body (3, 33), coupling teeth (7, 37) formed on the outer circumference (5) of the main body (3, 33), and a collar (17, 37), which extends circumferentially along the inner circumference (13, 35) of the main body (3, 33) and is divided into partial segments (15, 39). The partial segments (15, 39) are axially offset at the respective end segments (21, 43) thereof in order to define the axial position of an intermediate synchronising ring of the synchronisation device. The invention further relates to a method for producing a coupling body (1, 31) for a synchronisation device of a motor vehicle.

Description

Name of the invention

Coupling body for a synchronization device of a motor vehicle

Description Field of the invention

The invention relates to a coupling body for a synchronization device of a motor vehicle having a substantially annular base body, a coupling toothing formed on the outer circumference of the base body, and a collar circumscribing the inner circumference of the base body and subdivided into subsegments.

Furthermore, the invention relates to a method for producing a coupling body for a synchronization device of a motor vehicle. Background of the invention

A clutch body is usually found in a synchronization device in the manual transmission of a motor vehicle application, wherein the synchronization device of the alignment of different shaft speeds between a to-switch idler gear and a stuck on a shaft switching element, a so-called synchronizer body, is used. The coupling body is arranged between the idler gear and the synchronizer body and serves to transmit torques from a shift sleeve to the idler gear. For speed equalization between a loose wheel and a synchronizer body and thus for synchronizing gears, synchronizer rings are used in a synchronization device, which is usually designed as a pure ring with friction surfaces on the inner circumferential surface or the outer circumferential surface are. Depending on how many friction rings are used in the synchronization device, a distinction is made between a single or multiple synchronization. In a so-called single cone synchronization at least one synchronous inner ring and a synchronous outer ring are used. In a so-called multi-cone synchronization also arranged between the synchronous inner ring and a synchronizer outer ring synchronizer intermediate ring is provided, which is formed both on its inner circumferential surface and on its outer circumferential surface with a corresponding friction surface. About the friction surfaces form the synchronizer rings when switching a frictional engagement, each with a friction surface of another synchronizer ring, so that align the speeds of the respective synchronizer rings associated waves.

EP 2 100 049 B1 discloses a coupling body of a synchronization device or a method for the production thereof. In this case, the coupling body is produced in one piece with an externally toothed coupling section and a friction cone section and essentially by a forming process from a sheet steel. Furthermore, window-shaped recesses are introduced into the clutch disc section in order to provide an opportunity for engagement for holding elements of an adjacent synchronous intermediate ring. The window-shaped recesses can be distributed over the circumference of the coupling body distributed evenly and be executed rectangular, square or round. Although a coupling body according to EP 2 100 049 B1 enables your non-rotatable arrangement of a synchronous intermediate ring during operation of a synchronization device. However, the required axial spacing between the coupling body and a synchronous intermediate ring can not be ensured reliably.

Object of the invention It is therefore a first object of the invention to provide a coupling body for a synchronization device, which allows secure axial positioning of a synchronizer ring. A second object is to provide a method by which a coupling body is simple and inexpensive to produce.

Summary of the invention The first object of the invention is achieved by a coupling body for a synchronization device of a motor vehicle, with a substantially annular base body, formed on the outer circumference of the body coupling teeth, as well as with a the inner circumference of the body circumferentially divided into sub-segments waistband. Here, the sub-segments for fixing the axial position of a synchronous intermediate ring of the synchronization device are axially offset at their respective end portions.

The invention takes into account that for a synchronization in a motor vehicle, the respective components used must be exactly matched to one another in order to enable a trouble-free switching operation. Here, in a multi-cone synchronization particular attention is paid to the positioning of a synchronous intermediate ring with respect to a coupling body. When using a synchronous intermediate ring as part of a multi-cone synchronization, a so-called wear reserve in the form of an air gap must be present between the synchronous intermediate ring and the coupling body, so that no axial contact between the main body of the synchronizer intermediate ring and the main body of the coupling body is established.

Ensuring the axial spacing of the components from each other, in particular by provided on the sub-segments of the rotating federal bearing surfaces, however, is due to the production of the coupling body problematic. The coupling bodies used hitherto are conventionally manufactured from a sheet by punching and forming. Due to the output sheet thickness, it is not always possible to ensure the desired position of the required contact surfaces for a synchronous intermediate ring. Even a possible subsequent machining of the coupling body can not ensure this and is also associated with a high manufacturing cost and effort.

In view of this, the invention recognizes that the required axial spacing between a synchronous intermediate ring and a coupling body and can be ensured when the end portions of the sub-segments of the inner circumference of the coupling body circumferential collar are axially offset. Due to the axial offset bearing surfaces are formed, which are axially offset from the sub-segments themselves. The contact surfaces at the respective end sections of the subsegments are displaced by the axial offset in the axial direction in such a way that they serve to abut a synchronizer ring in the circumferential direction while maintaining the necessary wear reserve. Thus, the desired spacing of the synchronous intermediate ring from the coupling body can be achieved in particular in multi-cone synchronization devices. In addition to this, a complex post-processing, such as, for example, a subsequent machining of the subsegments, can be dispensed with. By the end portions of the sub-segments or by the axial displacement of the end portions each sub-segment preferably two contact surfaces for the investment of holding elements, such as driving lugs or Mitnehmerlappen a synchronizer intermediate ring provided. These holding elements which engage in the installed state in the areas between the sub-segments on the inner circumference of the main body of the coupling body, so are applied to the contact surfaces. As a result, a rotationally fixed arrangement of a synchronous intermediate ring is ensured on a coupling body during operation of a synchronization device. In particular, come the holding elements in such a way to the respective contact surfaces for conditioning that the necessary axial spacing is given while maintaining the wear reserve between the coupling body and the synchronizer intermediate ring. The coupling body is in the assembled state in particular drehest with the idler gear, an externally toothed gear connected. The coupling body may for example be positively or materially secured, for example by means of welding attached to the idler gear. The coupling teeth, or the switching teeth on the outer circumference of the main body of the coupling body is formed with roof angles, which are directed towards the synchronizer ring in the installed state. The roof angles are used to engage the teeth of a sliding sleeve during the switching process.

In an advantageous embodiment of the invention, the axial offset of the end portions of the sub-segments is introduced in each case by forming. During forming, the respective sub-segment is plastically deformed under change of shape, whereby both volume, as well as the mass and the cohesion of the material are retained. Thus, by forming the end portions of the sub-segments with the introduction of an axial offset, the contact surface required for the axial spacing of synchronous intermediate ring and coupling body can be introduced into the end sections.

It when the axial offset is introduced at the respective end portions of the sub-segments by a penetration is particularly advantageous. The enforcement is a massive forming in which changes in shape with great solidification of the material arise, which can withstand high loads. Through the enforcements, the contact surfaces are pushed axially at the end portions of the sub-segments to the correct position. Depending on the design of the geometry of the holding elements of a synchronous intermediate ring, the geometry and the position of the respective contact surfaces may be different, wherein the geometries at the coupling body be suitably coordinated by and on the synchronous intermediate ring.

The axial offset at the end sections of the subsegments is preferably formed in each case by an axial step. By introducing axial stages, the contact surfaces for a synchronous intermediate ring are pushed axially to the desired position and thus enable the necessary spacing between the coupling body and a synchronous intermediate ring in the installed state of a synchronization device.

More preferably, the end portions of the sub-segments are each angled in the axial direction. Here, the contact surfaces are each provided as oblique enforcements in the end sections of the sub-segments of the federal government. Even with such an embodiment, the desired axial distance between the components in the assembled state is reliably given.

Conveniently, the areas between the sub-segments of the collar are formed as window-shaped recesses. The recesses represent the correspondingly required engagement geometry for the engagement of the holding elements or driving lugs of a synchronous intermediate ring for positive locking of the coupling body with the synchronous intermediate ring.

Preferably, the end portions of the sub-segments are each formed in pairs rotationally symmetrical on the inner circumference of the body. In other words, for example, in the case of an embodiment of the peripherally segmented collar with three subsegments, these can be interconverted by 120 ° when the coupling body is rotated. Such a configuration allows in the installed state of the coupling body a secure system for a suitably also formed with rotationally symmetrical holding elements formed synchronizer intermediate ring.

The second object of the invention is achieved by a method for producing a coupling body for a synchronization Vor- direction of a motor vehicle, in which a metal sheet is provided, from the sheet metal, a substantially annular base body is made, a coupling toothing is formed on the outer periphery of the body and on the inner periphery of the body, a collar is formed with a number of sub-segments. Finally, the sub-segments for fixing the axial position of a synchronous intermediate ring of the synchronization device are offset axially at their respective end portions by forming.

By forming and the associated axial offset of the end sections of the subsegments, the abutment surfaces required for abutment for a synchronizer intermediate ring are pushed axially to the correct position and thus serve to ensure the desired axial position of a synchronous intermediate ring in the installed state in a synchronization device. A post-processing of the sub-segments can be omitted, which favors a cost-effective production of the coupling body.

For the production of the main body, in particular a sheet is used, from which the base body is punched out. Alternatively, it is also possible to use a metal strip, which is formed into a ring and finally welded at the ends. The external teeth as well as the circumferentially segmented collar is introduced by forming.

The machined in the manufacture of the coupling body end portions of the sub-segments provide contact surfaces for holding elements of Synchronzwischen- ring available. In this case, the axial spacing of the end sections achieves the necessary axial spacing while maintaining the wear reserve between the coupling body and the intermediate synchronizing ring.

Preferably, the respective axial offset is introduced at the end portions of the sub-segments as an enforcement, so that the desired shape changes are implemented while solidifying the end portions of the sub-segments. For centering a synchronous intermediate ring in the installed state, the end sections of the subsegments are each axially offset in pairs in rotational symmetry on the inner circumference of the main body. Preferably, an axial step is introduced at the end portions of the sub-segments, which allows a bearing of a holding element of a synchronous intermediate ring under axial spacing of the synchronizer ring from the coupling body. It is also advantageous if the end sections of the subsegments are each angled in the axial direction. Even with such an embodiment, a contact of a holding element of a synchronous intermediate ring is possible, wherein the holding elements of the synchronizer ring are matched accordingly to end portions of the sub-segments of the coupling body.

Further advantageous embodiments of the method for producing a coupling body for a synchronization device resulting from the directed to the coupling body subclaims. The advantages mentioned for this purpose can be correspondingly applied to the method.

Brief description of the drawings

In the following, embodiments of the invention will be explained in more detail with reference to the drawing. Showing:

1 shows a coupling body for a synchronization device with a formed on the inner circumference of its body segmented collar in a three-dimensional representation, and

Fig. 2 shows a detail of another coupling body for a synchronization device with a on the inner circumference of his Body formed segmented collar in a two-dimensional representation.

Detailed description of the drawings

Fig. 1 shows a coupling body 1 for a synchronization device of a motor vehicle. The coupling body 1 has a substantially annular base body 3, which is produced by punching out of a metal sheet. On the outer circumference 5 of the main body 3, a coupling toothing 7 is formed whose teeth 9 have roof angles 11. The coupling toothing 7 is integrally formed on the base body 3 and serves in the installed state of the coupling body to engage the toothing of a sliding sleeve during the switching operation. On the inner circumference 13 of the main body 3 is a circumferential, divided into three sub-segments 15 collar 17 is formed. The sub-segments 15 of the collar 17 are spaced from each other by window-shaped recesses 19. In the installed state of the coupling body 1 grip elements such as driving lugs or Mitnehmerlappen a synchronous intermediate ring in the recesses 19, whereby a rotationally fixed arrangement of a synchronous intermediate ring on the coupling body 1 is ensured.

In addition, the holding elements of the synchronous intermediate ring come in the installed state on the coupling body 1 to the plant. In order to ensure the required axial spacing between the two components, the end portions 21 of the sub-segments 15 of the base body 3 are axially offset. By this axial offset 23, a contact surface 25 is formed at each end portion 21. The contact surfaces 25 are formed by so-called axial stages in the end portions 21 of the sub-segments 15 in the form of enforcements 27. The contact surfaces 25 serve to secure the axial position of a synchronous intermediate ring in the installed state in a synchronization device. By the interspersed end portions 21 of the sub-segments 15, the contact surfaces 25 are moved at the respective end portions 21 in the axial direction so that they serve to rest a synchronous intermediate ring in the circumferential direction while maintaining the necessary wear reserve. Thus, the desired spacing of the synchronous intermediate ring from the coupling body 1 can be achieved in particular in multi-cone synchronization systems. In addition to this, a complex post-processing, such as, for example, a subsequent machining of the subsegments, can be dispensed with. Furthermore, the end portions 21 of the sub-segments 15 are each formed in pairs rotationally symmetrical on the inner circumference 13 of the base body 3 and in a rotation of the coupling body 1 by 120 ° into one another.

FIG. 2 shows a detail of a further coupling body 31 for a synchronization device. Like the coupling body 1 according to FIG. 1, coupling body 31 has a substantially annular base body 33 with a coupling toothing formed on its outer circumference for engaging the toothing of a sliding sleeve during the switching operation. Due to the illustration, the coupling toothing is not shown here.

On the inner circumference 35 of the main body 33, a circumferential collar 37 is formed, which is divided into three sub-segments 39. The sub-segments 39 are spaced from each other by window-shaped recesses 41 and serve the engagement of holding elements of a synchronous intermediate ring in the installed state of the coupling body 31st

In addition, the holding elements of the synchronous intermediate ring come in the installed state on the coupling body 31 to the plant. For the axial spacing of the coupling body 31 from a synchronous intermediate ring, the partial segments 39 are offset axially at their respective end sections 43. As a result of this axial offset 45, a contact surface 47 is also formed on the coupling body 31 at each end section 43. In contrast to the contact surfaces 25 according to FIG. 1, the contact surfaces 47 are angled at the respective end sections 43 in the axial direction 48. The provision of the contact surfaces 47 takes place here by an oblique enforcement 49 of the end portions 43, which allows an axial displacement of the abutment surfaces 47 such that they can be used to create a synchronous intermediate ring while maintaining the necessary axial distance. Again, a post-processing can be omitted.

As in Fig. 1, the end portions 43 of the sub-segments 39 are each formed in pairs rotationally symmetrical on the inner circumference 35 of the base body 33 and in a rotation of the coupling body 1 by 120 ° into one another ü- feasible.

LIST OF REFERENCE NUMBERS

1 coupling body

3 basic body

5 outer circumference

7 Clutch toothing

9 tooth

1 1 roof angle

13 inner circumference

15 subsegment

17 fret

19 recess

21 end section

23 axial offset

25 contact surface

27 enforcement

31 coupling body

33 basic body

35 inner circumference

37 fret

39 subsegment

41 recess

43 end section

45 axial offset

47 contact surface

48 axial direction

49 enforcement

Claims

claims

1 . Coupling body (1, 31) for a synchronization device of a motor vehicle, having a substantially annular base body (3, 33), a on the outer circumference (5) of the base body (3, 33) formed coupling teeth (7, 37), and with a the inner circumference (13, 35) of the base body (3, 33) encircling, in sub-segments (15, 39) divided collar (17, 37), wherein the sub-segments (15, 39) for fixing the axial position of a synchronizer ring at their respective end portions (21, 43) are axially offset.

2. Coupling body (1, 31) according to any one of the preceding claim 1, wherein the axial offset (23, 45) at the end portions (21, 43) of the sub-segments (15, 39) is introduced in each case by forming.

3. Coupling body (1, 31) according to any one of claims 1 or 2, wherein the axial offset (23, 45) at the end portions (21, 43) of the sub-segments (15, 39) is formed in each case by an axial step.

4. Coupling body (1, 31) according to any one of claims 1 or 2, wherein the end portions (21, 43) of the sub-segments (15, 39) are each angled in the axial direction.

5. Coupling body (1, 31) according to any one of the preceding claims, wherein the end portions (21, 43) of the sub-segments (15, 39) in pairs are rotationally symmetrical on the inner circumference of the base body (3, 33) are formed.

6. A method for producing a coupling body (1, 31) for a synchronization device of a motor vehicle, in which a sheet metal is provided, from the sheet metal, a substantially annular base body (3, 33) is made, a coupling teeth (7, 37) is formed on the outer circumference (5, 35) of the main body (3, 33), on the inner circumference (13, 35) of the base body (3, 33) a collar (17, 37) with a number of sub-segments (15, 39) is formed, and wherein the sub-segments (15, 39) for fixing the axial position of a synchronous intermediate ring at their respective end portions (21 , 43) are axially displaced by forming.

A method according to claim 6, wherein the respective axial offset (23, 45) is introduced at the end portions (21, 43) of the subsegments (15, 39) as an enforcement.

8. The method according to claim 6 or 7, wherein the end portions (21, 43) of the sub-segments (15, 39) are each pairwise rotationally symmetrically offset axially on the inner circumference of the base body (3, 33).

9. The method according to any one of claims 6 to 8, wherein at the Endabschnit- th (21, 43) of the sub-segments (15, 39) in each case an axial step is introduced.

10. The method according to any one of claims 7 to 9, wherein the end portions (21, 43) of the sub-segments (15, 39) are each angled in the axial direction.