WO2017020902A1

WO2017020902A1 - Actuator device for a transmission and transmission having the actuator device

Info

Publication number: WO2017020902A1
Application number: PCT/DE2016/200328
Authority: WO
Inventors: Miroslav Marek; Radovan Knotek
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2015-08-03
Filing date: 2016-07-20
Publication date: 2017-02-09
Also published as: DE102015214719A1

Abstract

In gearshift transmissions, shafts are selectively coupled to loose gears by means of coupling apparatuses in order to shift gears. The coupling apparatuses usually have a body that is connected to the shaft for conjoint rotation. For coupling, the coupling apparatuses typically have a sliding sleeve, which has an inner axial set of teeth, wherein the sliding sleeve is connected to the body for conjoint rotation but in an axially slidable manner. By means of axial sliding of the sliding sleeve, the sliding sleeve is moved onto a coupling segment of the loose gear such that the loose gear and the body are connected for conjoint rotation by means of the sliding sleeve. The problem addressed by the invention is that of proposing an actuator device for shifting a transmission, said actuator device being easy to integrate. This problem is solved by means of an actuator device (1) for a transmission (2) having a shifting sleeve insert (3) for coupling a synchronizing body (23) to a loose gear (22a, b) and having an electric motor (5) for axially sliding the shifting sleeve insert (3), wherein the shifting sleeve insert (3) is arranged coaxial to the electric motor and/or in the electric motor (5).

Description

Actuator device for a transmission and transmission with the actuator device

The invention relates to an actuator device for a transmission with a shift sleeve insert for coupling a synchronizer body with a loose wheel and with an electric motor for axial displacement of the shift sleeve insert. Furthermore, the invention relates to a transmission with this actuator device.

In gear change transmissions, shafts are selectively coupled via coupling devices with idler gears to change gears. The coupling devices usually have a body which is rotatably connected to the shaft. For coupling, the coupling devices usually comprise a sliding sleeve, which has an inner axial toothing, wherein the sliding sleeve is non-rotatably, but axially displaceably connected to the body. By an axial displacement of the sliding sleeve, this is moved to a coupling portion of the idler gear, so that the idler gear and the body are rotatably connected via the sliding sleeve. Optionally, a synchronizer can be arranged between the idler gear and the coupling device in order to equalize the rotational speed between the shaft and the idler gear.

The actuation of the sliding sleeve is often done by shift forks, which engage in a circumferential groove of the sliding sleeve and which can put the sliding sleeve in the axial direction. The shift forks are operated as a function of the configuration of the gear change by the switching force applied by a driver or by an actuator.

The publication WO 2004/00 5769 A1, which forms probably the closest prior art discloses a transmission circuit for idler gears with sliding sleeves, which are rotatably connected to a main shaft and can be brought by axial displacement with a to-switch idler gear in positive engagement, the operation of the respective sliding sleeve is provided via at least one actuating unit, wherein the actuating unit has an electric servomotor.

The invention has for its object to provide an actuator device for switching a transmission, which is easy to integrate. This object is achieved by an actuator device with the features of claim 1 and by a transmission with the features of claim 9. Preferred or advantageous embodiments of the invention will become apparent from the dependent claims, the following description and the accompanying drawings.

The invention relates to an actuator device which is suitable and / or designed for a transmission. In particular, the transmission is designed as a gear change gearbox or as a gear change gearbox. The Aktorvorrichung is designed in particular for switching, preferably, the actuator device has the task to implement a coupling and / or decoupling between a shaft of the transmission and a loose wheel, in particular a gear wheel of the transmission.

The actuator device has a shift sleeve insert which is suitable and / or designed for coupling a synchronizer to the loose wheel. The synchronizer body is in particular arranged rotationally fixed on the shaft. Optionally, the synchronizer body forms part of the actuator device. The idler gear is arranged coaxially with the shaft and rotatably supported. The shift sleeve insert is preferably designed sleeve-shaped, wherein on the inner wall Axialinnenverzahnung is arranged. The synchronizer body has an external axial toothing, which is in a positive engagement with the Axialinnenverzahnung the shift sleeve insert, so that the shift sleeve insert and the synchronous body are arranged rotatably relative to each other.

The idler gear, in particular a coupling portion of the idler gear, has an axial external toothing, so that the idler gear with the shift sleeve insert and thus with the synchronizer body can be brought into a positive engagement and thus rotatably coupled. In the coupled state, the shift sleeve insert is in a positive engagement with the synchronizer body and at the same time with the idler gear, so that the synchronizer body and thus the shaft with the idler gear is positively and / or rotatably connected.

The actuator device further comprises an electric motor for axial displacement of the shift sleeve insert. In particular, the electric motor forms a drive for axial displacement of the shift sleeve insert. Preferably, the electric motor is assigned exclusively to the shift sleeve insert. The electric motor has a rotor and a stator. In particular, the electric motor is designed as an internal rotor. Preferably, the electric motor and / or its integration is designed so that the shift sleeve insert can be moved so that the shift sleeve insert can couple and decouple the idler gear. Preferably, the electric motor is designed as a stepper motor. Alternatively, the electric motor can be designed as a servo motor with an encoder, in particular an absolute encoder, for the angular position. Through this preferred embodiment, the axial position of the shift sleeve insert can be controlled via the angular position of the rotor.

In the context of the invention, it is proposed that the shift sleeve insert and the electric motor are arranged coaxially with each other. In particular, the electric motor, in particular a stator and / or rotor of the electric motor extends around the shift sleeve insert. Alternatively or additionally, it is claimed that the shift sleeve insert in the electric motor, in particular in a rotor space of the electric motor at least partially or completely arranged, in particular is integrated. Particularly preferably, the shift sleeve insert and the electric motor are arranged at least in sections or completely concentrically with one another.

Due to the arrangement or integration of the shift sleeve insert in the interior of the electric motor, in particular partially or completely in the rotor space of the electric motor, it is achieved that the space requirement for the actuator device is very low. In particular, no complex lever mechanisms are required to transmit a movement from the electric motor to the shift sleeve insert. Instead, shift sleeve insert and electric motor are arranged very space saving to each other.

In particular, the actuator device is designed as a direct drive for the shift sleeve insert. The terms axial and radial refer to the shaft or a main axis defined by the shaft, which is aligned coaxially with the shift sleeve insert and / or to the idler gear and / or to the electric motor.

In a preferred embodiment of the invention, the electric motor and the shift sleeve insert are operatively connected to each other via a rotary linear converter. The rotary linear converter has the function to implement a rotational movement of the electric motor, in particular of the rotor of the electric motor, in a linear movement of the shift sleeve insert in the axial direction for moving the shift sleeve insert.

In a preferred structural embodiment of the invention, the actuator device comprises a push insert and a rotor device. The rotor device comprises or is formed by the rotor of the electric motor. The rotor device may be integral or composed of several parts. In particular, the rotor device is rotatably formed with the rotor. The push insert is arranged coaxially with the rotor device and / or in the rotor device. The thrust body is e.g. designed as a sleeve. Preferably, the push insert is rotatably disposed in the actuator device. On the one hand, the push insert with the rotor device and on the other hand, the push insert is operatively connected to the shift sleeve insert. The active compounds are designed so that a rotation of the rotor device leads to an axial displacement of the push insert and the shift sleeve insert.

In particular, the rotor device and the push insert together form a spindle drive, which converts the rotational movement and the linear movement. Alternatively or additionally, the rotor device and the push insert are over Thread operatively connected. In this case, the push insert has an external thread and the rotor device has an internal thread, with the external thread and the internal thread interlocking. If the rotor device rotates, the push insert is turned out in the axial direction.

Preferably, the shift sleeve insert and the push insert are non-displaceable in the axial direction, preferably non-displaceably positive, are coupled together. However, push insert and shift sleeve insert are decoupled in the direction of rotation, so that the shift sleeve insert, which is rotatably coupled to the shaft or coupled, can rotate during operation, regardless of the push insert.

It is particularly preferred that the push insert is mounted relative to the shift sleeve insert via a thrust bearing assembly. The radial mounting of the shift sleeve insert is preferably carried out by the support on the synchronizer body. However, a thrust bearing arrangement is advantageous because the push insert moves the shift sleeve insert in the axial direction, so that it must contact the shift sleeve insert. In particular, during operation, the shaft, so that the synchronizer body and with this the shift sleeve insert rotate strongly, so that the thrust bearing assembly reduces the friction in the actuator device.

In a preferred structural embodiment, the thrust bearing assembly comprises a first and a second axial roller bearing. A shoulder portion of the shift sleeve insert is disposed between the Axialwälzlagern. Thus, the shift sleeve insert is supported by the Axialwälzlagern in the axial direction on both sides. The Axialwälzlager be embraced by the push insert on both sides, so that by embracing an abutment is formed. For example, a shoulder can be inserted into the push insert for the anvil, but alternatively a ring is inserted into the push insert. Such a ring is also advantageous in order to design the actuator device in an assembly-appropriate manner. It is particularly preferred that in a neutral state of the actuator device, the shift sleeve insert in the electric motor is arranged flush or even offset inwards. In particular, the shift sleeve insert in the axial direction as long as the electric motor, in particular the rotor of the electric motor, designed or even implemented shorter. This ensures that the actuator device is very compact.

Another object of the invention relates to a transmission, in particular a gear change gear or gear change transmission, with a shaft, in particular a main shaft, a synchronizer body, wherein the synchronizer body is rotatably mounted on the shaft, and at least one idler gear, wherein the idler gear is disposed on the shaft. Furthermore, the transmission comprises the actuator device according to one of the preceding claims. As already explained, the actuator device serves to positively couple or decouple the synchronizer body with the idler gear by means of the shift sleeve insert.

It is envisaged that in a neutral state of the shift sleeve insert is arranged in the electric motor and the idler gear is decoupled from the shift sleeve insert. Furthermore, the transmission can assume at least or exactly a coupling state, wherein the synchronizer body is positively coupled to the idler gear by the shift sleeve insert in the direction of rotation.

Further features, effects and advantages of the invention will become apparent from the following description of a preferred embodiment of the invention and the accompanying figures. Showing:

1 shows a schematic longitudinal section through an actuator device together with a detailed representation of the actuator device as an embodiment of the invention;

FIG. 2 shows the actuator device in FIG. 1 in an exploded view; FIGS. 3a-c show a transmission with the actuator device of the preceding figures in different operating states.

FIG. 1 shows an actuator device 1 for a transmission 2 (FIGS. 3 a, b, c) as an exemplary embodiment of the invention in a schematic longitudinal section along a main axis H of the actuator device 1. The transmission 2 is designed as a gear or gear change transmission. The actuator device 1 is designed to perform a gear or gear change under control.

The actuator device 1 has a shift sleeve insert 3. The shift sleeve insert 3 is formed as a sleeve, wherein arranged on the inner peripheral surface of an axial toothing 4 with a plurality of teeth extending in the axial direction or parallel to the main axis H, in particular is formed. In particular, the axial toothing 4 is designed as a roof toothing.

The actuator device has an electric motor 5, which is designed as an internal rotor. The electric motor 5 has a stator 6 and an internal rotor 7. The rotor 7 defines by its inner peripheral surface and its axial extent a rotor space, wherein in the rotor space of the shift sleeve insert 3 is arranged. In particular, the electric motor 5, the stator 6, the rotor 7 and the shift sleeve insert 3 are arranged coaxially with each other. In the illustration in FIG. 1, the actuator device is in a neutral state, wherein the shift sleeve insert 3 is arranged concentrically to the electric motor 5, the stator 6 and / or the rotor 7. The actuator device 1 is very compact, wherein the axial width of the actuator device 1 is fixed in the neutral state by the axial width of the stator 6 and the rotor 7. The axial sides of the shift sleeve insert 3 are arranged within the rotor space.

On the right side, a detail of the actuator device 1 is shown, from which it can be seen that the stator 6 is formed as a circumferential sleeve or ring. The rotor 7 is designed as a rotor device 8 and carries at its radially inner circumferential surface an internal thread 9. In others Embodiments, the internal thread 9 may also be placed as a separate part on the rotor 7, so that rotor 7 and internal thread 9 together form the rotor device 8.

Further, a push insert 10 is provided coaxially with the major axis H. The push insert 10 carries on its radial outer surface an external thread 1 1. The external thread 1 1 is in engagement with the internal thread 9. The push insert 10 and the rotor device 8 together form a spindle drive and / or a rotary linear converter. Upon rotation of the rotor device 8, the push insert 10 is moved in the axial direction to the main axis of rotation H via the internal thread 9 and the external thread 1 1. It is preferably ensured that the push insert 10 can not rotate.

The push insert 10 is in turn connected via a thrust bearing assembly 12 with the shift sleeve insert 3, in such a way that the shift sleeve insert 3 can rotate independently of the push insert 10, but is taken in the axial movement in both axial directions of the push insert 10.

The axial bearing arrangement has a first and a second axial roller bearing 13a, b. The shift sleeve insert 3 has a shoulder portion 14, which is divided in this present embodiment by a groove portion 15 in two individual webs 16a, b. At the axial outer sides of the individual webs 16 a, b and the shoulder portion 14 is in each case one of the Axialwälzlager 13 a, b at. In particular, a respective bearing ring of the Axialwälzlagers 13 a, b is rotatably connected to the shift sleeve insert 3.

The other bearing ring of the thrust roller bearings 13a, b, however, is rotatably coupled to the push insert 10. For this purpose, the push insert 10 on its radially inner peripheral surface on a contact shoulder 17 on which the Axialwälzlager 13a optionally rests with the interposition of a seal. On the opposite side a circumferential groove 18 for receiving a retaining ring 19 is mounted in the push insert 10, wherein the second bearing ring of the second thrust roller bearing 13b is supported on the retaining ring 19 in the axial direction. Also in the second axial roller bearing 13b can be provided that a seal is interposed. If the pusher insert 10 is then displaced to the right by rotation of the rotor device 8 in the image in FIG. 1, the abutment shoulder 17 presses against the first axial roller bearing 13a and thus urges the shift sleeve insert 3 in the desired direction. If the push insert 10 is moved to the left, then the retaining ring 19 presses against the second axial roller bearing 13b, so that the shift sleeve insert 3 is moved in the desired direction.

In FIG. 2, the actuator device 1 is shown in an exploded view, wherein it can be seen that the electric motor 5 forms a very large passage openings with the stator 6 and the rotor 7. The axial width of the electric motor 5 is greater than the simple ring width of the electric motor 5 in the radial direction. The free diameter of the electric motor 5 is at least five times as large as the simple simple ring width of the electric motor 5 in the radial direction.

On the inner peripheral surface of the rotor 7, the internal thread 9 can be seen, which in the present case has only three threads. Due to the small number of threads of the internal thread 9 a large axial stroke is achieved with a few turns of the rotor 7.

On the left side in Figure 2, the push insert 10 is shown, which is formed as a sleeve. The push insert 10 has an external thread 1 1, which is complementary to the internal thread 9 is formed.

In a central region of the shift sleeve insert 3 is shown, wherein the webs 16a, b can be seen, which rotate around the shift sleeve insert 3 and the shoulder portion 14 form. Left and right next to the shift sleeve insert 3, the Axialwälzlager 13a, 13b are shown, which each have a sealing attachment. In addition, the retaining ring 19 is shown. Figures 3a, b, c respectively show the transmission 2 and a portion thereof with a shaft 21 on which two idler gears 22a, 22b are mounted. Between the idler gears 22a, b, the actuator device 1 is arranged. On the shaft 21 also sits a synchronizer body 23 which is rotatably connected to the shaft 21. Between the synchronizer body 23 and the idler gears 22a, b is in each case a synchronizer ring or Snychronringpaket 24a, b arranged. The shift sleeve insert 3 is connected to the Axialinnenverzahnung 4 in engagement with a Axialaußenverzahnung 25 of the synchronizer body 23. Upon actuation of the actuator device 1, the push insert 10 and thus the shift sleeve insert 3 is displaced in the axial direction to the idler gear 24a. As soon as the shift sleeve insert 3 engages or engages over a coupling section 26a, b of the first and second idler gears 22a, b, the synchronizer body 23 and the respective idler gear 22a, b are coupled with each other in a rotationally fixed manner.

In the figure 3b, the transmission 20 is shown in a neutral state, wherein the shift sleeve insert 3 is disposed completely in the rotor space of the rotor 7. In the figure 3a, a first switching state is shown, wherein the shift sleeve insert 3 is extended to the left and is rotatably connected to the idler gear 22a. In the figure 3c, a second switching state is shown, wherein the shift sleeve insert 3 is extended to the right and is rotatably coupled to the second idler gear 22b.

LIST OF REFERENCES

actuator device

transmission

Switching sleeve insert

Axialinnenverzahnung

electric motor

stator

rotor

rotor means

inner thread

railable

external thread

The axial bearing

a, b Axial rolling bearings

shoulder portion

groove

a, b single webs

contact shoulder

groove

retaining ring

wave

a, b loose wheels

synchronizer

a, b synchronizer ring / synchronizer ring package

Axialaußenverzahnung

a, b coupling sections

main axis

Claims

claims

1 . Actuator device (1) for a transmission (2) with a shift sleeve insert (3) for coupling a synchronizer body (23) to a loose wheel (22a, b), with an electric motor (5) for axially displacing the shift sleeve insert (3), characterized in that the shift sleeve insert (3) is arranged coaxially to the electric motor (5) and / or in the electric motor (5).

2. Actuator device (1) according to claim 1, characterized in that the electric motor (5) and the shift sleeve insert (3) are operatively connected to each other via a rotary-linear converter.

3. Actuator device (1) according to claim 1 or 2, characterized by a push insert (10) and a rotor device (8) of the electric motor (5), wherein the push insert (10) is arranged coaxially to and / or in the rotor device (8) wherein the pusher insert (10) is operatively connected to the rotor means (8) and to the shift sleeve insert (3) so that rotation of the rotor means (8) results in axial displacement of the pusher insert (10) and the shift sleeve insert (3).

4. Actuator device (1) according to claim 3, characterized in that the rotor device (8) and the push insert (10) form a spindle drive and / or are operatively connected to one another via a thread.

5. Actuator device (1) according to claim 3 or 4, characterized in that the push insert (10) and the shift sleeve insert (3) are coupled together in the axial direction against displacement and decoupled in the direction of rotation.

6. Actuator device (1) according to one of claims 3 to 5, characterized in that the push insert (10) relative to the shift sleeve insert (3) via a thrust bearing assembly (12) is mounted.

7. actuator device (1) according to claim 6, characterized in that the thrust bearing assembly (12) has a first and a second Axialwälzlager (13a, b), wherein a shoulder portion (14) of the shift sleeve insert (3) between the Axialwälzlagern (13a, b ) is arranged and the Axialwälzlager (13a, b) of the push insert (10) are embraced on both sides.

8. Actuator device (1) according to one of the preceding claims, characterized in that in a neutral state of the shift sleeve insert (3) in the electric motor (5) is arranged flush or inwardly staggered.

9. gear (2) having a shaft (21), a synchronizer body (23), wherein the synchronizer body (23) rotatably mounted on the shaft (21), at least one

Idler wheel (22a, b) and the actuator device (1) according to one of the preceding claims.

10. Transmission (2) according to claim 9, characterized in that in a coupling state of the synchronizer body (23) with the idler gear (22 a, b) through the

Shift sleeve insert (3) is positively coupled.