WO2009015995A1

WO2009015995A1 - Transmission actuator for actuating a shifting device of a transmission

Info

Publication number: WO2009015995A1
Application number: PCT/EP2008/058680
Authority: WO
Inventors: Eckhardt LÜBKE; Markus Fuchs; Walter Müller
Original assignee: Zf Friedrichshafen Ag
Priority date: 2007-08-02
Filing date: 2008-07-04
Publication date: 2009-02-05
Also published as: DE102007036336A1

Abstract

The invention relates to a transmission actuator for actuating a shifting device of a transmission of a vehicle. According to the invention, a common drive device (1) for executing a selection movement and a shifting movement is provided.

Description

Gearbox actuator for actuating a switching device of a gearbox

The present invention relates to a transmission actuator according to the closer defined in the preamble of claim 1. Art.

For example, from the publication WO 03/023258 A1, a transmission with an electromechanical transmission actuator is known. The gearbox has a first electric motor for performing a selection movement and a second electric motor for exercising a switching movement in a switching device in a transmission housing of a transmission of a vehicle. Each of the electric motors drives a separate ball screw. The two ballscrews are arranged parallel to each other.

The selection movement is effected in the known Getriebesteller by the axial movement of the ball nut on the ball screw, which is driven by the first electric motor. The switching movement is effected by the axial movement of the ball nut on the ball screw, which is driven by the second electric motor. Thus, in the known transmission actuator two drive means are required to perform the selection movement and the switching movement of the transmission can.

The present invention is based on the object to propose a transmission actuator of the type described above, which has the smallest possible space requirement and is inexpensive to produce.

This object is achieved by the features of claim 1. Further advantageous embodiments and advantages will become apparent from the dependent claims and the drawings. Thus, a transmission actuator is proposed for operating a switching device of a transmission of a vehicle, in which a common drive means for performing a selection movement and a switching movement is provided. In this way, otherwise required components and components can be saved so as to achieve a considerable space and cost advantage with at least equivalent functionality of the transmission actuator.

The drive device of the transmission actuator proposed according to the invention can be driven, for example, electrically by an electric motor, but also pneumatically or hydraulically. There are also other types of drive conceivable.

In the context of a preferred embodiment, it can be provided that the drive device comprises an electrically driven spindle drive, which has a shift finger which can be switched over to execute the selection movement and the switching movement as the spindle nut. Thus, the rotational movement of the spindle can be converted into an axial movement or longitudinal movement or in a rotational movement of the shift finger. As a result, the transmission actuator according to the invention can realize depending on the switching position of the shift finger with only one drive means both the selection movement and the switching movement.

In order to realize the switching of the shift finger between selecting and switching, it can be provided according to an embodiment of the invention that a switching device or the like is provided. Preferably, the switching device may have an actuating element for adjusting a switching element between a first end position and a second end position. Both the mode of operation and the type of function can be chosen as desired. For example, an electromagnetic, hydraulic or pneumatic actuation can take place. A preferred embodiment of the invention provides that the actuating element is designed as an electromagnetically operated plunger, which can adjust the spring-loaded, mounted on the shift finger switching element between the two end positions. If the electromagnetic plunger on the housing side and the switching element is arranged switching finger side, for example, a grinding or rolling contact between the plunger and the switching element may be provided. It is also conceivable that another, for example, reverse arrangement of the components described is realized.

It can preferably be provided that in a first end position of the switching element is provided that the shift finger is positively connected to a housing of the drive device in connection. As a result, the shift finger is moved in the axial direction of the spindle as soon as the spindle is rotated. In a second end position of the switching element of the shift finger can be positively associated with the spindle of the spindle drive in connection. In this second position, the shift finger is set in rotation when the gear actuator is activated. An axial movement does not execute the shift finger in this position. The switching between the two end positions corresponds to the switching between the selection movement and the switching movement of the transmission actuator.

To the z. B. to realize positive connection between the switching element on the one hand and the spindle or the housing on the other hand, can be provided, the corresponding recesses are provided on the housing and the spindle. These recesses can be configured as desired. The spindle has a groove running in the axial direction. In addition to the positive connection and other types of connections, z. B. non-positive connections or the like, possible. A next advantageous development of the invention can provide that the shift finger has at least one blocking element or the like for blocking the non-selected shift rails during the shift operation. In this way it is prevented that when switching a certain shift rail no further shift rail is actuated unintentionally. Preferably, on both sides of an extension of the shift finger such a blocking element can be arranged such that the movement of the blocking element is decoupled in the direction of the switching movement of the movement of the shift finger. This means that the blocking element is only moved when selecting with the shift finger.

A possible embodiment of the invention may provide that the spindle drive of the transmission actuator according to the invention is arranged, for example, transversely to the shift rails of the switching device. In this embodiment variant, the selection movement can be realized in that the shift finger is brought into positive engagement with the housing via the switching element. This corresponds to the first end position of the switching element. By the rotation of the e.g. an electric motor driven spindle of the shift finger performs an axial movement. Due to the axial movement, a desired shift rail position can be selected. So that the switching element can be positively connected after selection in the rotational direction with the groove provided as a recess in the spindle, it should be ensured that the selection path is integer divisible by the pitch of the spindle. This ensures that the rotational angular position of the spindle and the switching element at the beginning and at the end of the selection process is identical.

After the end of the selection movement of the shift finger can be positively brought by the corresponding operation of the switching element in connection with the spindle. As a result of the rotation of the spindle, which is driven by an electric motor, for example, the shift finger performs a shift movement. from which is converted into a linear movement of the respective shift rail or shift rod, which has been previously selected in the selection process. As a result, the switching movement is realized in the transmission actuator.

In order to apply the required switching forces, it may be advantageous if between the drive motor and the spindle of the drive means a reduction gear or the like is interposed. For example, a planetary gear can be used as a reduction gear.

A further possible embodiment of the invention may provide that the drive device is arranged with the spindle approximately parallel to the shift rails in the switching device. This means that the spindle is arranged rotated approximately 90 ° in comparison to the previously described embodiment variant. There are also other arrangement options conceivable.

In this parallel arrangement of the spindle and the shift rails of the selection process is realized in that the shift finger and the spindle are positively connected to each other via the correspondingly actuated switching element. The rotation of the spindle rotates the shift finger to the corresponding selection position. As a result, a desired shift rail can be selected. This corresponds to the second end position of the switching element.

For switching it can be provided that the shift finger is brought into positive engagement with the housing via the correspondingly actuated changeover element. This corresponds to the first end position of the switching element. By the rotation of the spindle of the shift finger performs a corresponding axial movement, which is forwarded to the shift rod. There- by the insertion of the desired gear is realized with the switching device.

The above-described embodiment has the advantage that the translation of the spindle thread is used with and thus can be dispensed with a reduction gear between the drive motor and the spindle of the drive device. This allows a further reduction in the cost of the transmission actuator.

The invention will be further explained with reference to the drawings. Show it:

Fig. 1 is a schematic, three-dimensional partial view of a

Embodiment of a transmission actuator;

Figure 2 is a schematic, three-dimensional partial view of the gear actuator in a rotated by 90 ° arrangement with respect to Fig. 1. and

Fig. 3 is a further schematic, three-dimensional partial view of the transmission actuator.

In FIGS. 1 to 3, a possible embodiment of a transmission actuator according to the invention for actuating a switching device of a transmission of a vehicle, not shown, is shown in each case. Figs. 1 and 2 differ only in that they show the gear actuator rotated at an angle of about 90 °.

According to the invention, the proposed gear actuator comprises a drive device 1, which controls both a selection movement and a shift movement. realized in the switching device. In this way, in contrast to known gearboxes no further drive device is needed.

The drive device 1 is formed in the embodiment shown here as an electrically driven spindle drive 2. The spindle drive 2 is driven by an electric motor 3, so that a spindle 4 of the spindle drive 2 is set in rotation when the electric motor 3 is in operation. The spindle 4 is engaged with a spindle nut, which is formed in the embodiment shown as a shift finger 5. The shift finger 5 has an extension 13, can be selected and switched with the not shown switching rails of the switching device.

In order to perform both the selection movement and the switching movement, a switching device is provided on the shift finger 5. The switching device comprises an actuating element for adjusting a switching element 7 between a first end position and a second end position. The switching element 7 is indicated only in Fig. 3.

1 and 2, the switching device is arranged above the spindle 4, wherein the switching means in Fig. 3 is provided laterally on the spindle 4. The actuating element is designed as an electromagnetically operated plunger 6, which actuates the switching element 7 for adjusting. The switching element 7 is mounted by means of a spring not shown movable on the shift finger 5.

In the first end position of the switching element 7, the shift finger 5 is brought into positive connection with a merely indicated housing 8 of the drive device 1 in connection. A corresponding recess in the housing 8 is not shown in the figures. In the second end position of the switching element 7 of the shift finger 5 is positively connected via the switching element 7 with the spindle 4. For this purpose, a groove 9 is provided in the spindle 4, wherein in Fig. 3, the groove 9 is indicated by way of example, in which the switching element can engage positively to connect the shift finger 5 with the spindle 4 rotatably.

In the embodiment of the transmission actuator shown, a blocking element 10 is arranged on the shift finger 5 in each case. The blocking element 10 serves to block the non-selected shift rails during the switching movement of the shift finger 5. For this purpose, the blocking element 10 is arranged on both sides of the extension 13 of the shift finger 5, so that the movement of the blocking element 10 in the direction of the switching movement of the movement of the shift finger 5 decoupled is. Thus, the blocking element 10 is moved only with a selection movement of the shift finger 5 with.

The operation of the transmission actuator according to the invention will be explained in more detail with reference to the embodiment shown in FIGS. 1 and 2.

The transmission actuator shown in Fig. 1 is arranged with its spindle drive 2 transversely to the shift rails of the switching device not shown. In this arrangement possibility, the selection movement of the gear actuator is realized in the first end position of the switching element 7, in which the shift finger 5 is positively connected to the housing 8 of the drive device 1. Thus, the shift finger 5 is axially moved by the rotation of the spindle 4. As a result, the shift finger 5 is assigned to the switching rail to be switched.

The switching operation is realized in this arrangement possibility by the second end position of the switching element 7. In this position, the shift finger 5 is in positive engagement with the spindle 4, so that by the rotation of the Spindle 4 and the shift finger 5 performs a rotational movement, which allows a linear movement of the associated shift rail. In this way, the selected gear is switched by the gearbox. In order to apply the necessary switching force, a reduction gear 1 1 is provided between the electric motor 3 and the spindle 4 in this embodiment.

In Fig. 2, the gear actuator with respect to FIG. 1 is arranged rotated by 90 °. In this arrangement option, the selection movement of the gear actuator is realized in the second end position of the switching element 7. In this position, the shift finger 5 is in positive engagement with the spindle 4. Thus, the shift finger 5 performs by the rotation of the spindle 4 from a circular motion, so that the shift finger 5 can be assigned to a switching rail to be switched.

The switching movement can be realized in this arrangement possibility in the first end position of the switching element 7. In this position, the shift finger 5 is in positive engagement with the housing 8 of the drive device 1. As a result, the shift finger 5 on rotation of the spindle 4 perform an axial movement, so that the shift finger 5 can operate the associated shift rail to shift the gear.

Regardless of the respective arrangement possibility of the gear actuator, the coupled with the shift finger 5 blocking element 10 can be moved in the selection movement and decoupled in the switching movement of the shift finger 5 of this, so that the adjacent shift rails to be switched shift rail are blocked. For this purpose, the blocking element 10 has a slot 12, which is aligned in the circuit movement direction, so that the shift finger 5 can be moved without the blocking element 10 to move. REFERENCE CHARACTERS

1 drive device

2 spindle drive

3 electric motor

4 spindle

5 shift fingers

6 electromagnetic plunger

7 switching element

8 housing

9 groove

10 blocking element

11 reduction gear

12 slot

13 extension

Claims

claims

1. gear actuator for actuating a switching device of a transmission of a vehicle, characterized in that a common drive means (1) for carrying out a selection movement and a switching movement is provided.

2. A gearbox according to claim 1, characterized in that the drive device (1) comprises an electrically driven spindle drive (2) having a spindle nut for carrying out the selection movement and the switching movement switchable shift finger (5).

3. Transmission actuator according to claim 2, characterized in that for switching the shift finger (5) between selecting and switching a switching device is provided.

4. Gear actuator according to claim 3, characterized in that the switching means comprises an actuating element for adjusting a switching element (7) between a first end position and a second end position.

5. Gear actuator according to claim 4, characterized in that the actuating element is designed as electromagnetically actuated plunger (6).

6. gear actuator according to claim 4 or 5, characterized in that the switching element (7) is spring-loaded on the shift finger (5) is mounted.

7. A gearbox according to one of claims 4 to 6, characterized in that the switching element (7) in its first end position the shift finger (5) positively with a housing (8) of the drive means (1) brings in connection.

8. Gear actuator according to one of claims 4 to 7, characterized in that the switching element (7) in its second end position, the shift finger (5) positively with the spindle (4) of the spindle drive (2) brings in connection.

9. gear actuator according to one of claims 4 to 8, characterized in that the housing (8) and the spindle (2) have at least one recess for positive connection with the switching element (7).

10. Gear actuator according to claim 9, characterized in that the spindle (4) has a groove (9) as a recess.

11. Gear actuator according to one of the preceding claims, characterized in that the shift finger (5) has at least one blocking element (10) for blocking the non-selected shift rails.

12. A gearbox according to claim 11, characterized in that the blocking element (10) is arranged on the shift finger (5) such that the movement of the blocking element (10) in the direction of the switching movement of the movement of the shift finger (5) is decoupled.

13. Gear actuator according to one of claims 2 to 12, characterized in that the spindle drive (2) is arranged transversely to the shift rails of the switching device.

14. A gearbox according to claim 13, characterized in that the selection movement in the first end position of the switching element (7) can be realized, wherein the shift finger (5) can be assigned by an axial movement of a desired shift rail.

15. Gear actuator according to claim 13 or 14, characterized in that the switching movement in the second end position of the switching element (7) can be realized, in which the rotation of the shift finger (5) allows a linear movement of the associated shift rail.

16, gear actuator according to one of claims 13 to 15, characterized in that the spindle (4) via an electric motor (3) with a reduction gear (11) is coupled.

17, gear actuator according to one of claims 2 to 16, characterized in that the spindle drive (2) is arranged approximately parallel to the shift rails of the switching device.

18. Gear actuator according to claim 17, characterized in that the switching movement in the first end position of the switching element (7) can be realized, in which the shift finger (5) actuated by the axial movement of an associated shift rail.

19. Gear actuator according to claim 17 or 18, characterized in that the selection movement in the second end position of the switching element (7) can be realized, in which the shift finger (5) can be assigned by a rotational movement of a desired shift rail.