Actuator and device for engaging a parking lock of an automatic vehicle transmission with such an actuator, and a motor vehicle equipped therewith.

Description

[0001] The invention relates to an actuator according to the preamble of claim 1. Furthermore, the invention relates to a device for activating a parking lock of a motor vehicle automatic transmission according to claim 13 and a motor vehicle equipped therewith according to claim 14.

[0002] The use of automatic transmissions, or shift-by-wire systems, in motor vehicles offers several advantages over mechanically coupled transmissions. For example, the transmission's gear ratios can be selected flexibly via software, depending on the vehicle's condition. Furthermore, activating the parking lock by engaging "P" (Park) is no longer done manually by the driver, but is automatically ensured by the control software, for example, when stopping or exiting the vehicle. Since engaging "P" to activate the parking lock before exiting the vehicle is mandatory for safety reasons, such systems and actuators have emergency mechanisms to guarantee engagement of "P" even in the event of an actuator malfunction or power failure.These emergency mechanisms typically work with energy storage devices, such as mechanical spring elements, which ensure, independently of the actuator, the insertion of a mechanical emergency position.

[0003] An actuator is known from DE 10 2011 014 815 A1. This patent describes a vehicle parking lock actuator with at least one spindle, in which a longitudinal movement for automatically shifting a gear stage is generated from the rotary movement of a motor. The emergency function for engaging the parking lock is implemented by a spring element, which is pre-tensioned by actuating the non-parking position of the actuator and mechanically held in place by a detent. A switching function for triggering the emergency mechanism to engage the P stage is to be provided by a voltage source independent of the actuator. A disadvantage of this actuator, however, is that an independent voltage source is required to trigger the emergency mechanism.Therefore, the P-stage cannot be engaged if the independent voltage source is also unavailable, which can occur particularly when the vehicle's battery is discharged and no other voltage source, such as a properly functioning generator, is available.

[0004] Furthermore, with the actuator of DE 10 2011 014 815 A1, the P stage must be left to pre-tension the spring element, which creates an unwanted and unsafe vehicle situation because the P stage of the transmission is left even though the emergency mechanism is not yet available.

[0005] From DE 100 45 953 B4, a parking lock device is known, which is intended in particular for a motor vehicle equipped with an automated transmission. The parking lock device has an actuating device comprising an actuating element for actuating a parking lock, a spring accumulator for activating the parking lock, a controllable actuator for deactivating the parking lock, and a locking device for locking the parking lock in the deactivated state. The actuator is electromechanically actuated and connected to a main actuating lever. The spring accumulator, the actuator, and the locking device can be brought into contact or operative connection with the actuating element via the main actuating lever.

[0006] DE 10 2017 218 638 A1 relates to an operating device for a parking lock for a motor vehicle.

[0007] Operating instructions for a parking lock for a motor vehicle are also known from DE 10 2016 224 660 A1 and DE 10 2014 219 037 A1.

[0008] EP 3 545 216 A1 relates to an unlocking device for unlocking a parking lock of a vehicle.

[0009] From EP 3 181 957 A1 a control system for a shift-by-wire circuit with unlocking of the parking mode is known.

[0010] WO 2017 / 182555 A (which serves as the basis for the preamble of claim 1) relates to an actuator comprising a drive for driving a drive shaft, a first actuating element operatively connected to the drive shaft for actuating a switching device, and a spring element which can be supported on one side by a housing component of the actuator and on the other side by a second actuating element designed for tensioning the spring element.

[0011] The object of the invention is therefore to further develop an actuator according to the preamble of claim 1 in such a way that it is ensured that in all situations, in particular in the event of a power supply failure, an actuating element for actuating a switching device of the actuator is automatically returned to its initial position. Furthermore, it is an object of the invention to provide a device for engaging or disengaging a parking lock of a motor vehicle automatic transmission with such an actuator, as well as an improved motor vehicle. In addition, it is an object of the invention that the actuator or the device can be used in a multitude of motor vehicles with different automatic transmissions and / or from different manufacturers.

[0012] With regard to the actuator, this problem is solved by an actuator with all the features of claim 1. With regard to the device for engaging a parking lock of a motor vehicle automatic transmission, the problem is solved by a device with all the features of claim 13. The problem is further solved by a motor vehicle according to claim 14. Advantageous embodiments of the invention are found in the dependent claims.

[0013] The actuator according to the invention comprises a drive for driving a drive shaft, a first actuating element operatively connected to the drive shaft for actuating a switching device and a spring element, wherein the spring element can be supported on one side on a housing component of the actuator and on the other side on a second actuating element designed for tensioning the spring element, wherein a rotary element which can be driven by means of the drive shaft and is rotatably mounted is provided.

[0014] The invention is now characterized in that a further actuating element is provided for actuating the switching device, which is operatively connected to the first actuating element, and a translation device with a translation element is provided between the first actuating element and the actuating element of the switching device.

[0015] Engaging and disengaging the parking lock of an automatic transmission requires a certain adjustment range. This range depends on the transmission variant and / or the vehicle manufacturer, resulting in a variety of different adjustment ranges for engaging and disengaging the parking lock. The required adjustment range can vary by a factor of three to four between different manufacturers.

[0016] According to the invention, a comparatively larger adjustment range can be achieved compared to known actuators due to the translation device with translation element, so that the actuator or device according to the invention can be used for a large number of transmission variants and / or vehicle manufacturers without having to make special adjustments to the different adjustment ranges on the actuator itself.

[0017] Furthermore, the invention is characterized in that a rotating element, which can be driven by means of the drive shaft and is rotatably mounted, is provided. This rotating element is designed on the one hand with a first control cam, which is operatively connected to the first actuating element, and on the other hand with a second control cam for tensioning the spring element.

[0018] The spring element's function is to engage the P-stage in the event of an actuator malfunction or power failure. For this purpose, the spring element is also operatively connected to the first actuating element via the second actuating element, so that the restoring force exerted by the spring element's preload allows the first actuating element to return to the P-stage along the first control cam. In particular, the second actuating element can be configured as a driver for the first actuating element.

[0019] To exit the P stage and engage different gears, such as R, N, D, the rotary element can be rotated by means of the drive and the drive shaft so that the first control cam can move the first actuating element due to its operative contact. A switching device connecting the actuator and the automatic transmission, for example with a shift cable, is designed to transmit the movement generated at the actuator to the automatic transmission, so that the P stage can be exited and different gears, such as R, N, D, can be selected.

[0020] The first control cam can have different slopes for the shifting movement or for engaging the gear stages. The slope of the control cam can be designed, for example, to generate sufficient actuating force to disengage the parking lock using the actuator or an emergency actuating device under all conditions. This actuating force essentially consists of the minimum actuating force required in the transmission to engage different gear stages and, if applicable, the restoring force of the spring element, against which the actuator already works when leaving the P stage. For example, such an actuating force can be approximately 500 N. In the event of emergency operation, the rotating element and the motor are reversed by the slope of the first control cam in conjunction with the first and second actuating elements of the actuator, under the influence of the spring force applied by the spring element.

[0021] The device according to the invention for engaging a parking lock in an automatic transmission of a motor vehicle comprises such an actuator according to the invention, in particular a parking lock actuator.

[0022] By using an actuator according to the invention in a device for engaging a parking lock in the automatic transmission of a motor vehicle, it is now ensured that the spring element can always be pre-tensioned before the vehicle's automatic transmission is disengaged from Park (P). Specifically, by means of the second control cam and the second engagement element of the second actuating element, it is now possible to pre-tension the spring element without changing the position of the first actuating element. This makes it possible to pre-tension the spring element while the first actuating element, when such an actuator is used in a motor vehicle with an automatic transmission, is in a position such that the vehicle's automatic transmission is in Park (P).

[0023] The rotary element may be limited in the range of its rotational movement between a maximum negative and a maximum positive rotational position due to the design of the first and / or the second control cam, so that, for example, a half rotation in each direction of rotation, i.e., approximately +180° or -180°, is possible.

[0024] According to a first advantageous embodiment of the invention, the shape of the transmission element is asymmetrical at least on one side. For example, the transmission element can be designed to be non-uniform. In this way, the transmission ratio of the transmission element can be varied; for instance, a higher force than the force of the spring element can be transmitted at the beginning of a movement, and a larger adjustment range can then be provided later on. This is particularly useful for setting up the P-stage and transitioning the switching device to the R-stage. The transmission ratio thus changes during actuation, since a higher force is no longer required later in the adjustment movement, but rather a larger adjustment range. The transmission ratio allows the required force to be applied within the necessary range.

[0025] In a further development of the invention, the transmission element is designed as a lever, in particular as a cranked lever or angled lever. This variant of the transmission element is a particularly simple design to manufacture. The angled lever allows the linear spring force to be translated into a non-linear spring force.

[0026] According to another variant of the invention, the lever is multi-part, preferably designed as a rigid unit.

[0027] Leverages are generally classified as either one-sided or two-sided, depending on whether the forces act on only one side or on both sides of the lever's pivot point. In addition to the straight lever, there are also angled levers and bent levers.

[0028] In a two-sided lever, the points of application of the forces, viewed from the axis of rotation, are on opposite sides of the lever. In a one-sided lever, the axis of rotation is at the end of the lever arm, so that the points of application of all acting forces, viewed from the axis of rotation, are on the same side of the lever. A lever with an angled arm is called an angled lever. Depending on the position of the axis of rotation, an angled lever resembles either a one-sided or a two-sided lever.

[0029] For a particularly simple translation of the force or adjustment range for engaging or disengaging a parking lock, the translation element is mounted on the first actuating element and / or on the actuating element of the switching device.

[0030] If the transmission element is a lever, for example an angled lever, one lever arm can be attached to the first actuating element and the other lever arm to the actuating element of the switching device, thus achieving the transmission in a simple manner. The lever is therefore arranged at two pivot points.

[0031] According to a further development, the transmission element is rotatably mounted about at least one axis of rotation, wherein the axis of rotation is arranged, in particular, between a pivot point of the transmission element on the first actuating element and a pivot point of the transmission element on the further actuating element of the switching device. In this way, pressure is transmitted to engage the parking lock.

[0032] Alternatively, it can be provided that at least one axis of rotation coincides with at least one pivot point, or that at least one axis of rotation lies outside the area between the pivot points. In the second case, where the axis of rotation lies outside the area between the pivot points, a force transmission occurs to disengage the parking lock. In this way, a comparatively higher force is exerted on the transmission element at the beginning of the movement to release the parking lock. A greater adjustment range is then provided as the movement progresses. The transmission allows the required force to be applied within the necessary range.

[0033] As mentioned, the lever can be designed as a single piece or in two parts. If the lever is designed as a two-part piece, it would rotate around the external axis of rotation.

[0034] According to a further advantageous embodiment of the invention, the axis of rotation is provided at one end of the actuating element.

[0035] Another advantageous embodiment of the invention provides that the translation element is arranged within a housing of the actuator.

[0036] According to an alternative embodiment of the actuator, the at least one transmission element can be designed as a gear pair, preferably arranged eccentrically. In particular, it is conceivable that the racks for the gears of the gear pair are arranged on the further actuating element for actuating the switching device and on the first actuating element. This design ensures actuation in the pulling direction.

[0037] In a further advantageous embodiment of the invention, it is provided that the translation element is designed as a multi-joint, in particular as a trapezoidally arranged four-joint.

[0038] Furthermore, it can be provided that when the rotary element is rotated from 0° towards its maximum positive angular position, e.g., up to 180°, different shift stages of such a switching device can be set by means of the first control cam and the first engagement element of the first actuating element. This makes it possible to set different shift stages of an automatic transmission without simultaneously having to tension the spring element, since this pre-tension of the spring element is already achieved by the previously described rotation of the rotary element into its maximum negative rotational position, e.g., from 0° to -180°. Thus, when the rotary element is rotated back from its maximum angular position, e.g.,At -180°C to 0°C, to maintain this preload, a holding device, in particular an electric holding magnet device, is advantageously provided with which the spring element, tensioned by building up a restoring force, is held in its position. Thus, tensioning the spring element during the engagement of different switching stages from the P stage is not necessary, as this has already been done beforehand.

[0039] To provide a particularly simple design for the rotary element, it has proven advantageous to design the rotary element as a circular disk, on which the two control cams are arranged on opposite faces of the disk. In this way, the control cams can be easily positioned using the corresponding engagement elements without having to consider any interfering influences from the other control cam or its corresponding engagement element.

[0040] Should the spring element not be pre-tensioned when exiting the P-stage, the first control cam is designed such that when the rotary element is turned from its angular position of 0° to its maximum positive angular position of up to +180°, the spring element is tensioned, generating a restoring force. This pre-tensioning of the spring element occurs particularly immediately after exiting the P-stage, so that the immediately available restoring force of the spring element is sufficient to return the first actuating element to the P-stage.

[0041] It has also proven advantageous to have a worm gear on the drive shaft, which drives a gear assembly that in turn drives the rotating element. The rotating element itself can be part of this gear assembly, or the gear assembly can consist of only one gear.

[0042] Alternatively, it is of course also conceivable that the gear arrangement consists of several gears that are operatively connected to each other, whereby one gear is designed as a circular disk which has the corresponding control cams on its opposite surfaces.

[0043] A device for engaging a parking lock of a motor vehicle automatic transmission with a previously described actuator, in particular a parking lock actuator, should also be protected independently.

[0044] Furthermore, a motor vehicle should also be protected independently by means of such a device, wherein the motor vehicle has an automatic transmission and a device described above for engaging a parking lock of the automatic transmission.

[0045] Further objectives, advantages, features and application possibilities of the present invention will become apparent from the following description of an exemplary embodiment with reference to the drawing.

[0046] Some of these show schematically: Figure 1 shows a first embodiment of an actuator according to the invention with a translation element in a first position, Figure 2 shows the actuator according to Figure 1 with translation element in a second position, Figure 3 a detailed view of a section of the actuator with translation element according to Figure 1 and 2 Figure 4 shows a second embodiment of the actuator with a translation element in a first position, Figure 5 shows the actuator according to Figure 4 with translation element in a second position, Figure 6 a detailed view of a section of the actuator with translation element according to Figure 4 and 5 and Figure 7 shows another embodiment of the translation element.

[0047] Identical or equivalent components are identified in the following figures of the drawing by reference numerals based on an embodiment, in order to improve readability.

[0048] Figure 1 as well as the Figures 2 , 4 and 5 The figures show an actuator according to the invention arranged in a housing, which is mounted on the housing plate 25 and covered with a housing cover (not shown). Also visible in this illustration is a cable 14, by means of which different shift stages of an automatic transmission of a motor vehicle can be set. The cable 14 is operatively connected to a first actuating element 3 for actuating the shifting device of the motor vehicle's automatic transmission.

[0049] Furthermore, according to the Figure 1 , 2 , 4 and 5A rotating element 4, designed as a gear 13 and also as a circular disk 6, is clearly visible. The rotating element 4 is rotatably mounted at its center and, in the present embodiment, has a control cam 7. Furthermore, the rotating element 4 has a second control cam. It is also possible for the rotating element 4 to have two different control cams on its opposite surfaces. The gear 13, which can also be part of a gear assembly, meshes in this case with a worm 11 of a drive shaft 1 of a drive 2.

[0050] The actuator can be in a position corresponding to the position of the P stage of an automatic transmission in a motor vehicle and the neutral angular position 0° of the rotary element 4. An engagement element of the first actuating element 3 is operatively engaged with the control cam 7. If the rotary element 4, designed as a gear 13, is now rotated by means of the drive 2, the drive shaft 1, and the worm 11, the actuating element 3 is moved towards the housing component 16 due to the engagement of the engagement element with the control cam 7. This moves the automatic transmission's shift mechanism, which is actuated by the cable 14 and not shown in detail here, out of or into its P stage, allowing different shift stages, for example R, N, D, to be selected.The rotary element 4 is limited in its rotational movement due to the control curve 7, so that a rotation of approximately +180° or another value is possible.

[0051] During operation of a motor vehicle, the spring element 5, after it has been pre-tensioned, can be held in the pre-tensioned position by means of an electric holding magnet device 26. In other words, the pre-tension of the spring element 5 is maintained in its tensioned position during the rotation of the rotating element 4 by means of the holding magnet device 26.

[0052] As from the Figures 1 to 6 As can be seen, the actuator has a further actuating element 12 for actuating the switching device, which is operatively connected to the first actuating element 3. A transmission device 8 with a transmission element 9 is provided between the first actuating element 3 and the actuating element 12 of the switching device.

[0053] To engage and disengage the parking lock of a motor vehicle's automatic transmission, an adjustment range is required. This adjustment range depends on the transmission variant and / or the vehicle manufacturer, resulting in a multitude of different adjustment ranges for engaging and disengaging the parking lock. Due to the transmission device 8 with transmission element 9 according to the invention, a comparatively larger adjustment range can be achieved compared to known actuators, so that the actuator or device according to the invention can be used for a multitude of transmission variants and / or vehicle manufacturers without making special adjustments to the different adjustment ranges.

[0054] According to the present embodiments, the shape of the translation element is asymmetrical on at least one side. For example, the translation element may be designed to be non-uniform.

[0055] In this way, the transmission ratio of the transmission element can be varied. For example, a higher force than the spring can be transmitted at the beginning of a movement, and a greater adjustment range can be provided later on. This is particularly useful for designing the P-stage and transitioning the switching device to the R-stage. The transmission ratio changes accordingly, since a higher force is no longer required later in the adjustment movement, but rather a greater adjustment range is needed.

[0056] According to the Figures 1 to 6The transmission element 9 is designed as a lever 20, in particular as a cranked lever or angled lever, whereby the linear spring force is translated into a non-linear spring force. For a particularly simple translation of the force or the adjustment travel for engaging or disengaging a parking lock, the transmission element 9 is mounted on the first actuating element 3 and / or on the actuating element 12 of the switching device.

[0057] In a two-sided lever, the points of application of the forces, viewed from the axis of rotation, are on opposite sides of the lever. In a one-sided lever, the axis of rotation is at the end of the lever arm, so that the points of application of all acting forces, viewed from the axis of rotation, are on the same side of the lever. A lever with an angled arm is called an angled lever. Depending on the position of the axis of rotation, an angled lever resembles either a one-sided or a two-sided lever.

[0058] How the Figures 1 to 6 As can be seen, one lever arm of the lever 20 can be attached to the first actuating element 3 and the other lever arm to the actuating element 12 of the switching device, so that the transmission is achieved in a simple manner. The lever 20 is therefore arranged at two pivot points 18, 19.

[0059] In the present case, the translation element 9 is rotatably mounted about at least one axis of rotation 10.

[0060] The embodiment of the actuator according to Figures 1 to 3 differs from the one according to Figures 4 to 6 through the translation element 9 designed as lever 20.

[0061] Figure 1Figure 1 shows the actuator with a transmission element 9, wherein the axis of rotation 10 of the transmission element 9 is arranged between a pivot point 18 of the transmission element 9 on the first actuating element 3 and a pivot point 19 of the transmission element 9 on the further actuating element 12 of the switching device. In this way, pressure is transmitted to engage the parking lock.

[0062] According to Figure 1 The spring element 5 is in a relaxed, first position 21 and in Figure 2 shown in a tensed, second position 22, in which the parking lock is engaged and a preload of the spring element 5 is maintained, for example by means of the holding magnet device 26 mentioned above.

[0063] When the translation element 9 and thus the first actuating element 3 and the further actuating element 12 of the switching device are moved, the cable pull 14 is acted upon in such a way that the parking lock is engaged by a pushing or sliding movement of the cable pull 14.

[0064] Figure 3 shows a detailed view of translation element 9 in the position according to Figure 1 .

[0065] Alternatively, it can also be provided that at least one axis of rotation coincides with at least one pivot point 18,19. According to Figures 4 to 6At least one axis of rotation 10 of the transmission element 9 lies outside the area between the pivot points 18, 19, so that a force transmission occurs to disengage the parking lock. In this way, a comparatively higher force is exerted on the transmission element at the beginning of the movement in order to release the parking lock. A comparatively larger adjustment range is then provided for in the further course of the movement.

[0066] According to Figure 4 A first position 23 of the translation element 9 is shown. Here, the parking lock is engaged, and the spring element 5 is relaxed. The holding magnet device 26 is open, so that no preload of the spring element 5 is maintained by means of the holding magnet device 26.

[0067] In the second position 24 of the actuator according to Figure 5The spring is tensioned and a preload of the spring element 5 is maintained by means of the holding magnet device 26. In contrast to the embodiment according to Figures 1 to 3 A pulling motion now takes place instead of a pushing or shearing motion.

[0068] According to the embodiment, in accordance with the Figures 4 to 6 The axis of rotation is provided at one end of the actuating element. Furthermore, it may be provided that the transmission element 9, in particular the lever 20, is designed in multiple parts, but nevertheless forms a rigid unit.

[0069] In this case, the translation element 9 is arranged within a housing of the actuator.

[0070] According to an alternative embodiment of the actuator, not shown, the at least one transmission element 9 can be designed as a gear pair, preferably arranged eccentrically. In particular, it is conceivable that the racks for the gears of the gear pair are arranged on the further actuating element 12 for actuating the switching device and the first actuating element 3.

[0071] In a further advantageous embodiment of the invention – not shown – it is provided that the translation element 9 is designed as a multi-joint, in particular as a trapezoidally arranged four-joint.

[0072] In the Figure 1 , but also in the Figures 2 , 4 and 5The first actuating element 3 is still recognizable, which on the one hand is provided with the engagement element that engages in the control curve 7 and on the other hand is connected to the cable pull 14 of a switching device of the automatic transmission of the motor vehicle.

[0073] The first actuating element 3 is slidably mounted in a second actuating element 17, which on the one hand is provided with a second engagement element for engagement in the - not shown - second control cam and on the other hand is supported on the spring element 5.

[0074] Furthermore, in Figures 1 to 6 The housing plate 25, on which the actuator is arranged, is also shown. Furthermore, the illustration of the Figures 1 to 6 It can be seen that the spring element 5 is supported on one side by a housing component 16 of the actuator and on the other side by the actuating element 17. Reference symbol list

[0075] 1 Drive shaft 2 Drive 3 Actuating element 4 Rotary element 5 Spring element 6 Rotary disc 7 Control cam 8 Transmission device 9 Transmission element 10 Axis of rotation of the transmission element 11 Worm gear 12 Further actuating element 13 Gear 14 Cable pull 15 End of the transmission element 16 Housing component 17 Actuating element 18 Linkage point 19 Linkage point 20 Lever 21 First position 22 Second position 23 First position 24 Second position 25 Housing plate 26 Holding magnet device

Claims

1. Actuator having a housing, a drive device (2) which drives a drive shaft (1), a first actuating element (3) which is operatively connected to the drive shaft (1), a spring element (5), which can be supported on one side on a housing component (16) of the actuator and is supported on the other side on a second actuating element (17) which is configured for stressing the spring element (5), wherein a rotational element (4) is provided, which can be driven by means of the drive shaft (1) and which is rotatably mounted, wherein the rotational element (4) has a first control cam (7), in which a first engagement element of the first actuating element (3) engages, and a second control cam, in which a second engagement element of the second actuating element (17) for stressing the spring element (5) engages, wherein the first control cam (7) is operatively connected to the first actuating element (3), wherein the first actuating element (3) is mounted movably in the second actuating element (17), characterized in that a further actuating element (12) is provided for actuating a switching device by means of a cable pull which is operatively connected to the first actuating element (3), and a transmission device (8) having a transmission element (9) is provided between the first actuating element (3) and the further actuating element (12) of the switching device, wherein the transmission element (9) is arranged within the housing.

2. Actuator according to Claim 1, characterized in that the form of the transmission element (9) is asymmetrical at least on one side.

3. Actuator according to Claim 1 or 2, characterized in that the transmission element (9) is configured as a lever (20), in particular as a cranked lever or angled lever.

4. Actuator according to Claim 3, characterized in that the lever (20) is configured in multiple parts, preferably as a rigid unit.

5. Actuator according to any one of Claims 1 to 4, characterized in that the transmission element (9) is received on the first actuating element (3) and / or on the further actuating element (12) of the actuator.

6. Actuator according to any one of Claims 1 to 5, characterized in that the transmission element (9) is mounted rotatably about at least one axis of rotation (10), wherein the axis of rotation (10) is arranged in particular between a linking point (18) of the transmission element (9) on the first actuating element (3) and a linking point (19) of the transmission element (9) on the further actuating element (12) of the switching device.

7. Actuator according to Claim 6, characterized in that the at least one axis of rotation (10) coincides with at least one linking point (18, 19) or in that the at least one axis of rotation (10) lies outside the region between the linking points (18, 19).

8. Actuator according to Claim 6 or 7, characterized in that the axis of rotation (10) is provided at one end (15) of the actuating element (9).

9. Actuator according to any one of the preceding claims, characterized in that the at least one transmission element (9) is configured as a gear pairing, preferably arranged eccentrically.

10. Actuator according to Claim 9, characterized in that the toothed racks for the gears of the gear pairing are arranged on the further actuating element (12) for actuating the switching device and the first actuating element (3).

11. Actuator according to any one of the preceding claims, characterized in that the transmission element (9) is configured as a multiple linkage, in particular as a trapezoidally arranged four-bar linkage.

12. Actuator according to any one of the preceding claims, characterized in that a worm (11) is arranged on the drive shaft (1), which worm is used to drive the rotational element (4) via a gear arrangement (12).

13. Device for engaging a parking lock of a motor-vehicle automatic transmission having an actuator according to any one of Claims 1 to 12.

14. Motor vehicle having an automatic transmission and a device interacting therewith according to Claim 13.