WO2014108121A1

WO2014108121A1 - Synchronising device of a motor vehicle change-speed gearbox

Info

Publication number: WO2014108121A1
Application number: PCT/DE2013/200334
Authority: WO
Inventors: Johannes Utz
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2013-01-14
Filing date: 2013-12-06
Publication date: 2014-07-17
Also published as: DE102013200397A1

Abstract

The invention relates to a synchronising device (1) of a motor vehicle change-speed gearbox, comprising at least one clutch body (2), which is connected rotationally conjointly to a gearwheel (3), and comprising at least one synchronising ring (4). To increase gearshift comfort, the invention proposes that the clutch body (2) be arranged in a rotationally conjoint but axially displaceable manner on the gearwheel (3), wherein at least one spring and/or damper element (5) which acts in an axial direction (a) is arranged between the clutch body (2) and the gearwheel (3).

Description

Synchronizer of a motor vehicle gear change transmission

description

FIELD OF THE INVENTION The invention relates to a synchronizing device of a motor vehicle gear change transmission, comprising at least one coupling body, which is non-rotatably connected to a gear wheel, and at least one synchronizer ring.

Background of the invention

A synchronizing device of this kind is known, for example, from DE 20 2006 019 959 U1. Such a synchronizer has inter alia a coupling body which is rotatably connected to a gear wheel of the transmission. Furthermore, a package of synchronizer rings is usually present, which serve to equalize the speed of the components during a transmission switching operation.

In this case, the coupling body is either welded by default to the gear wheel or connected with a gear teeth with the gear wheel (in addition, there is also the design as a monoblock). The splines can either allow an axial displacement of the coupling body or the two components (gear wheel and coupling body) are secured against axial displacement or axial play. During the synchronization process, there is a "free-flying phase" of the ring-shaped moving elements, which often results in a double pressure point when shifting from one gear to the other, as the already synchronized component is again subject to a difference due to drag torques. speed can be awarded. The sliding sleeve of the arrangement beats on the rigidly connected toothing of the coupling body. Depending on the case, a double pressure point or several additional pressure points can be transmitted to the circuit and thus ultimately to the driver's hand.

This adversely affects the shifting comfort.

Object of the invention

The present invention is based on the invention to further develop a synchronizing device of the type mentioned in the introduction in such a way that the mentioned disadvantage is avoided. Accordingly, the synchronizer should be characterized by an increased shift comfort. The shift quality should therefore be improved. This applies in particular with regard to dual-clutch transmissions and here especially with automatically connected transmissions.

Summary of the invention

The solution to this problem by the invention is characterized in that the coupling body is rotatably but axially displaceable on or on the gear wheel, wherein at least one effective in the axial direction spring and / or damping element between the clutch body and the gear wheel is arranged ,

The at least one spring and / or damping element is preferably designed as a plate spring, wave spring, helical compression spring, annular spring or ring made of E lastomer or rubber material. In this case, a plurality of disc springs (arranged in the same package or arranged in opposite directions as a column) may be arranged in the package between the coupling body and the gear wheel. But it is also just possible that only a single plate spring or wave spring between the clutch body and the gear wheel is arranged. The gear wheel preferably has an outer profiling, which cooperates with an inner profiling in the coupling body. The profiles are preferably formed as a toothing. But there are also other solutions for the realization of an axial displaceability and a simultaneous rotation lock possible. Here can z. B. three pins are used, which are arranged distributed around the circumference and allow an axial displacement between the coupling body and gear wheel, but prevent relative rotation of these components.

The gear wheel may have a cylindrical portion on which the coupling body is arranged axially displaceable. The gear wheel may also have an end face which adjoins the cylindrical portion and forms a contact surface for the at least one spring and / or damping element.

The at least one spring and / or damping element can be connected to the coupling body. In this case, it is then provided, for example, that the at least one spring and / or damping element and the coupling body are connected to one another by material connection, in particular by welding, by form fit or by frictional engagement.

The connection can be done for example by jamming, so that frictional engagement is present. For a positive fit grooves or recesses can be provided. Of course, it is also possible to work without such a connection, ie. H. then the spring and / or damping element is placed loosely between the components.

The coupling body is thus axially displaceable according to the invention on the gear wheel. Between the gear wheel and the coupling body at least one axially acting spring and / or damping element is arranged. The spring and / or damping element thus acts between the gear wheel and the coupling body in the axial direction. The coupling body is against rotation tiv to the gear wheel in particular secured with a toothing; However, a relative axial movement between the gear and clutch body is possible.

For the most part, only resilient elements (eg a plate spring or a shaft spring) can also be combined with largely only damping elements (eg a ring made of rubber material).

As a result of the embodiment according to the invention, the coupling body, together with the synchronizing package, is accelerated against the sliding sleeve by the spring and / or damping element prestressed during the synchronizing process at the end of the synchronization process. This results in an advantageous manner that is loosened by an impulse so far the ring package. The above-mentioned "free-flying phase" is also advantageously shortened.

Due to these effects, the second pressure point is smaller and thus results in a higher shifting comfort.

This is particularly noticeable in automated double-clutch transmissions. There are less switching noises here. Furthermore, the components are less heavily loaded. Finally, there is a better controllability of the actuator circuit (eg the hydraulic system).

Brief description of the figures

In the figures, embodiments of the invention are shown. Show it:

Fig. 1 in radial section a part of a synchronizer of a

Automotive Zahnräderwechelgetriebes,

2 shows the gear wheel and the coupling body of the synchronizer in radial section according to a first embodiment of the invention, 3 shows a detail of the representation according to FIG. 2 according to a second embodiment of the invention, FIG. 4 shows a detail of the illustration according to FIG. 2 according to a third

Embodiment of the invention and

Fig. 5 shows a detail of the illustration of FIG. 2 according to a fourth

Embodiment of the invention.

Detailed description of the figures

In Fig. 1, a part of a synchronizer 1 is shown. An outer synchronizer ring 10, a synchronizer intermediate ring 1 1 and an inner synchronizer ring 4 form a ring package. A synchronizer body 12 is fixed with internal teeth for rotationally fixed arrangement on a transmission shaft. In addition to the synchronizer body 12, a gear 3 is arranged. With the gear 3, a coupling body 2 is connected. This has recesses 13, engage in the drive cam 14 of the intermediate ring 1 1. The intermediate ring 1 1 forms with the Gegenreibfläche of the outer synchronizer ring 10 as a counter-cone a first friction pair 15; with the Gegenreibfläche the inner synchronizer ring 4, the intermediate ring 1 1 forms a second friction pair 16. A sliding sleeve 17 is moved in the axial direction a to switch the corresponding gears.

An inboard 18 of the inner synchronizer ring 4 is interrupted by recesses and partially hidden by a shoulder of the synchronizer body 12. The heel engages in the recesses. Thus, the inner synchronizer ring 4 is positively connected to the synchronizer body 12. The outer synchronizer ring 10 is positively connected via its board to the synchronizer body 12. The positive connection of the outer synchronizer ring 10 with the synchronizer body 12 via recesses 19 of his Bordes. The coupling body 2 has an end face, which is designed for the frictional start of an end face of the inner synchronizer ring 4. Accordingly, the coupling body 2 and the inner synchronizer ring 4 abut each other during a switching operation at a contact surface.

Details of the embodiment according to the invention can be seen from FIG. 2 for a first embodiment of the invention. Here it can be seen that the coupling body 2 in the axial direction a slidably, but rotatably connected to the gear 3. This is accomplished here by the fact that the coupling body 2 has an internal toothing 7, which is formed to match an external toothing 6, which is incorporated on the gear wheel 3. More specifically, the gear wheel 3 has a cylindrical portion 8 which carries on its outer periphery said outer teeth 6. At the (right) axial end of the cylindrical portion 8, a radially extending end face 9 connects.

It is essential that an effective in the axial direction a spring and / or damping element 5 between the clutch body 2 and the gear 3 is arranged. The spring and / or damping element 5 is presently designed as a plate spring, which rests with its radially outer end on the end face 9. The radially inner end of the plate spring 5 is located in the radially inner region of the coupling body 2.

Accordingly, the coupling body 2 relative to the gear 3 in the axial direction a against the force of the plate spring 5 can be moved elastically. The result is an increase in shifting comfort, as described above.

Fig. 3 shows an alternative embodiment to the solution according to FIG. 2. Here, as a spring element 5, a helical spring is provided, or there are several, for. B. four, coil springs 5 arranged around the circumference around to ensure a uniform compression in the axial direction a for the clutch body 2 relative to the gear 3. The gear wheel 3 facing ends of the coil springs 5 are arranged here in preferably circular recesses 20 to give the coil springs 5 in the radial direction and in the circumferential direction stop. According to the further alternative embodiment according to FIG. 4, it is provided that a ring of rubber material is used here as the spring and / or damping element 5. Accordingly, here - in contrast to the solution discussed above - the damping of the axial movement between the coupling body 2 and the gear 3 in the foreground.

In the further alternative solution according to FIG. 5, it is provided that the coupling body 3 is guided in its axial movement relative to the gear wheel 3. For this purpose, a guide pin 21 is inserted into the gear 3; a receiving bore 23 in the coupling body 2 is tolerated to the outer periphery of the guide pin 21 with clearance, so that a sliding seat in the axial direction a for the coupling body 2 on the guide pin 21 is present. The spring and / or damping element 5 is designed here as a helical spring. This includes the guide pin 21 and is guided in the axial direction. For a secure reception in the radial direction, a recess 20 may again be provided; but this is not mandatory. Conversely, the guide pin 21 can sit in the bore 22 with clearance and between the guide pin 21 and the receiving bore 23 press fit.

Of course, in all embodiments as spring and Dämpfele- elements 5 all mentioned elements are used individually or in combination. LIST OF REFERENCE NUMBERS

1 synchronizer

2 coupling body

3 gear wheel

4 synchronizing ring

5 spring and / or damping element (disc spring)

6 external profiling (external toothing)

7 internal profiling (internal toothing)

8 cylindrical section

9 face

10 outer synchronizer ring

1 1 synchronous intermediate ring

12 synchronizer body

13 recess

14 driver cams

15 first friction pairing

16 second friction pairing

17 sliding sleeve

18 inboard

19 recess

20 recess

21 guide pin

22 bore

23 receiving bore a axial direction

Claims

claims

1 . Synchronizing device (1) of a motor vehicle gear change transmission comprising at least one coupling body (2) which is rotatably connected to a gear wheel (3) and at least one synchronizer ring (4), characterized in that the coupling body (2) rotatably, but axially displaceable on or on the gear wheel (3) is arranged, wherein at least one in the axial direction (a) effective spring and / or damping element (5) between the coupling body (2) and the gear wheel (3) is arranged.

2. Synchronizing device according to claim 1, characterized in that the at least one spring and / or damping element (5) is designed as a plate spring, wave spring, helical compression spring, annular spring or ring of E lastomer or rubber material.

3. Synchronizing device according to claim 2, characterized in that a plurality of disc springs (5) in the same direction or in opposite directions in the package between the coupling body (2) and the gear wheel (3) are arranged.

4. Synchronizing device according to claim 1, characterized in that a single plate spring or wave spring (5) between the coupling body (2) and the gear wheel (3) is arranged.

5. Synchronizing device according to one of claims 1 to 4, characterized in that the gear wheel (3) has an outer profiling (6) up, which cooperates with an inner profiling (7) in the coupling body (2). Synchronizing device according to claim 5, characterized in that the profilings (6, 7) are formed as toothing.

Synchronizing device according to one of claims 1 to 6, characterized in that the gear wheel (3) has a cylindrical portion (8) on which the coupling body (2) is arranged axially displaceable.

Synchronizing device according to claim 7, characterized in that the gear wheel (3) has an end face (9) which adjoins the cylindrical portion (8) and forms a bearing surface for the at least one spring and / or damping element (5).

Synchronizing device according to one of claims 1 to 8, characterized in that the at least one spring and / or damping element (5) with the coupling body (2) is connected.

Synchronizing device according to claim 9, characterized in that the at least one spring and / or damping element (5) and the coupling body (2) are connected to each other by material bond, in particular by a weld, by positive engagement or by frictional engagement.