DE102022211362A1 - Parking lock arrangement - Google Patents

Abstract

A parking lock arrangement (15) is described with a drive device (16), with a first drive element (24) which can be pivoted by the drive device (16) about a fixed axis of rotation (29), and with a second drive element (27) which is operatively connected to the first drive element (24) via a spring unit (28) and can be connected to the first drive element (24) in a rotationally fixed manner via a locking device (30) and can be pivoted together with the first drive element (24) about the axis of rotation (29) of the first drive element (24). An actuating element (31) can be brought into engagement or disengaged with a locking element (18) depending on a pivoting movement of the second drive element (27), via which a rotary movement of a shaft (7) can be blocked and released. When the locking device (30) is deactivated, the second drive element (27) can be pivoted by the spring unit (28) about a further axis of rotation (45) relative to the first drive element (24). The further axis of rotation (45) is fixed to the first drive element (24) and is spaced from the axis of rotation (29) of the first drive element (24).

Description

The invention relates to a parking lock arrangement according to the type defined in the preamble of patent claim 1.

A parking lock system for a motor vehicle is known from EN 10 2019 001 189 A1 known. The parking lock system has a housing and a drive shaft that can be coupled to a wheel of the motor vehicle. Furthermore, a locking element is provided, via which the drive shaft can be connected to the housing in a rotationally fixed manner. In addition, the parking lock system has an actuating element that is intended to actuate the locking element. A first adjusting disc and a second adjusting disc are arranged around a common axis of rotation. The first adjusting disc is rotationally adjustable via an adjusting device. A first actuator is coupled to the actuating element and to the second adjusting disc.

In addition, the adjustment device, the first adjusting disk, the second adjusting disk, the first actuator, the actuating element and the locking element are arranged in such a way that an actuating force can be transmitted from the adjustment device to the first adjusting disk. The actuating force is transmitted from the first adjusting disk to the second adjusting disk, from there to the first actuator, from there to the actuating element and from there to the locking element. Furthermore, at least one spring device is provided which has a first end and a second end. The first end is supported at least indirectly against the first adjusting disk, while the second end is supported at least indirectly against the second adjusting disk.

In addition, the parking lock system comprises a second actuator which cannot pivot relative to the first actuator and is arranged so as to be displaceable in a longitudinal direction arranged perpendicular to the common axis of rotation. The second actuator is directly coupled to the first actuator by means of the spring device.

The disadvantage of the parking lock system is that it has a complex design and also requires high actuating forces to engage the parking lock arrangement in emergency mode. This is the case because the two actuators are moved relative to each other along a common contact area during an engagement process in emergency mode. This causes friction in the contact area. The resulting friction force must also be overcome by the spring device.

The present invention is based on the object of creating a structurally simple parking lock arrangement, in particular a parking lock arrangement of a drive train of a vehicle, which can also be actuated with low actuating forces, in particular during emergency operation.

According to the invention, this object is achieved with a parking lock arrangement having the features of patent claim 1.

The parking lock arrangement according to the invention comprises a drive device and a first drive element which can be pivoted by the drive device about a fixed axis of rotation. In addition, a second drive element is provided which is operatively connected to the first drive element via a spring unit. In addition, the second drive element can be connected to the first drive element in a rotationally fixed manner via a locking device and can be pivoted together with the first drive element about the axis of rotation of the first drive element.

An actuating element can be brought into or out of engagement with a locking element depending on a pivoting movement of the second drive element, via which a rotary movement of a shaft can be locked and released.

According to the invention, the second drive element can be pivoted by the spring unit about a further axis of rotation relative to the first drive element when the locking device is deactivated. The further axis of rotation is fixed to the first drive element and is spaced apart from the axis of rotation of the first drive element.

The second drive element is preferably permanently rotatably mounted on the first drive element. The second drive element can be brought into operative connection with the first drive element in the region of the axis of rotation via the locking device in such a way that the locking device blocks a rotational movement of the second drive element relative to the first drive element about the further axis of rotation. The second drive element and the first drive element can then be pivoted together by the drive device about the axis of rotation.

This offers the possibility that the parking lock arrangement, the spring unit of which establishes an operative connection between the first drive element and the second drive element, can be operated in a particularly energetically favorable manner during normal operation of the parking lock arrangement without changing the spring preload of the spring unit.

This means that the parking lock arrangement can be actuated via the drive device during normal operation, during which the two drive elements are connected to one another in a rotationally fixed manner via the locking device. This means that the parking lock arrangement can be transferred by the drive device from an engaged state (P_on), in which the shaft is held in a rotationally fixed manner by the parking lock arrangement, to a disengaged state (P_off), in which the rotational movement of the shaft is released by the parking lock arrangement. Furthermore, the parking lock arrangement can also be transferred by the drive device during normal operation from the disengaged operating state to the engaged operating state with low actuating forces. This is always the case because no relative movement or resulting frictional forces occur in the area between the drive elements due to the rotationally fixed coupling of the drive elements.

In addition, the parking lock arrangement can also be operated with low actuating forces during emergency operation, during which the parking lock arrangement cannot be actuated by the drive device. This is the case because in emergency operation, in which the rotationally fixed connection between the first drive element and the second drive element is released by deactivating the locking device, the second drive element executes a relative movement with respect to the first drive element around the further axis of rotation due to the spring force of the spring unit and the parking lock arrangement is either engaged or disengaged depending on the respective application. Since the further drive element can only be mounted on the first drive element around the further axis of rotation and can be carried out in contact with it, the frictional forces occurring between the drive elements in emergency operation are significantly lower than in the known parking lock arrangement.

In a further embodiment of the parking lock device according to the invention, which is structurally simple and characterized by a high power density, the drive device comprises an electric motor. A drive shaft of the electric motor is connected in a rotationally fixed manner to a gear wheel which is in engagement with a toothing of the first drive element. It can be provided that the toothing is designed as a tooth profile which extends over a defined angular range and forms a type of gear wheel segment.

If the tooth engagement between the gear wheel and the toothing of the first drive element is designed to be self-locking, an additional locking mechanism with which the parking lock arrangement is held in the engaged state or in the disengaged state can advantageously be dispensed with.

For this purpose, it is possible, for example, to carry out the tooth engagement between the gear and the toothing in the manner of a self-locking worm gear or the like.

In a structurally simple, space-saving and lightweight embodiment, the parking lock arrangement according to the invention comprises disk-like or lever-like drive elements.

Furthermore, the axis of rotation of the first drive element and the further axis of rotation can be provided so as to run parallel to one another in an embodiment of the parking lock arrangement according to the invention which is advantageous in terms of installation space.

In a further development of the parking lock arrangement according to the invention that is economical in terms of installation space and structurally simple, the spring unit is designed as a torsion spring. The torsion spring can be arranged between the two drive elements so as to act around the further axis of rotation and can be supported at one end on the first drive element and at the other end on the second drive element. Furthermore, the spring unit between the drive elements can be pre-tensioned in such a way that the spring unit applies a spring force to the second drive element. The spring force can act on the second drive element in the direction of a position of the second drive element that the second drive element has when the locking element blocks or releases the rotary movement of the shaft. This embodiment of the parking lock arrangement according to the invention ensures, without additional control and regulation effort, that the second drive element is transferred by the spring unit into a preferred pivot position in which the parking lock arrangement is either in the engaged or disengaged operating state.

The locking device can have a lifting magnet, by means of which a locking element can be guided against a spring out of engagement with the second drive element. In this case, it is possible for the locking element to be longitudinally displaceable along the axis of rotation. This offers the possibility of releasing the operative connection between the two drive elements in the area of the axis of rotation of the first drive element by applying a short electrical pulse via the lifting magnet and releasing the relative rotational movement of the second drive element with respect to the first drive element. In addition, the The locking element ensures that the locking device is activated automatically as soon as the two drive elements are in the required swivel positions.

In a further development of the parking lock arrangement according to the invention, which can be operated with little control and regulation effort, a pivot angle range of the first drive element is limited by stops both in the direction of a position of the first drive element which the first drive element has when the locking element blocks the rotary movement of the shaft, and in the direction of a position of the first drive element which the first drive element assumes when the locking element releases the rotary movement of the shaft.

This also applies to a further embodiment of the parking lock arrangement according to the present invention, in which a pivot angle range of the second drive element is limited by stops both in the direction of a position of the second drive element which the second drive element has when the locking element blocks the rotational movement of the shaft and in the direction of a position of the second drive element which the second drive element assumes when the locking element releases the rotational movement of the shaft.

In a particularly easy-to-operate embodiment of the parking lock arrangement according to the invention, the stop which limits the pivot angle range of the second drive element in the direction of the position of the second drive element which the second drive element assumes when the locking element releases the rotational movement of the shaft is provided in the region of the first drive element.

In a preferred embodiment of the parking lock arrangement according to the invention, the second drive element can be transferred by the first drive element by means of the stop in the region of the first drive element without additional control and regulation effort from its pivoted position relative to the first drive element into the pivoted position in which the two drive elements are connected to one another by the locking element.

A further spring unit can act on the locking element in the direction of the position of the locking element which the locking element has when the locking element releases the rotary movement of the shaft. In addition, it can be provided that the further spring unit is supported at one end on the locking element and at the other end on the second drive element.

The parking lock arrangement can be operated with the lowest possible energy expenditure if the additional spring unit assigned to the locking element acts on the second drive element and on the locking element in such a way that the spring characteristic curve of the additional spring unit has a degressive course. This is particularly advantageous if the degressive course enables the locking element to be moved into the position in which the locking element blocks the rotary movement of the shaft with the lowest possible actuating forces.

A parking lock arrangement is to be understood in particular as a system that is intended to lock a motor vehicle drive train, in particular in the area of a transmission, in an engaged state, so that at least one output shaft of the transmission is blocked and a motor vehicle is secured against rolling away in a parked state. The engaged state of the parking lock arrangement corresponds in particular to a so-called P_on state. In a disengaged state, the parking lock arrangement is intended to release the output shaft.

The disengaged state of the parking lock arrangement corresponds in particular to a so-called P_off state. For this purpose, the parking lock arrangement preferably has a parking lock gear. A parking lock gear is to be understood in particular as a gear wheel that has a toothing on its circumference that is intended for coupling with a locking element that is at least partially fixed to the housing, in particular a pawl. The locking element is preferably intended to set the parking lock gear fixed to the housing when the parking lock arrangement is engaged. A pawl is to be understood in particular as an element that can be pivoted between two operating positions and that forms at least one locking tooth that is designed to correspond to the toothing of the parking lock gear and is intended to engage positively in the toothing of the parking lock gear for engaging the parking lock arrangement.

The invention is not limited to the specified combination of the features of the independent claims or the claims dependent thereon. There are also possibilities to combine individual features with one another, even if they emerge from the claims, the following description of embodiments or directly from the drawings. The reference of the claims to the drawings by using reference symbols is not intended to limit the scope of protection of the claims.

Preferred developments emerge from the subclaims and the following description. Exemplary embodiments of the invention are explained in more detail with reference to the drawing, without being limited thereto.

• 1 eine vereinfachte Darstellung einer elektrisch antreibbaren Fahrzeugachse eines Fahrzeuges mit einer Parksperrenanordnung;
• 2 eine vereinfachte dreidimensionale Darstellung der Parksperrenanordnung der Fahrzeugachse gemäß 1 in eingelegtem Betriebszustand der Parksperrenanordung;
• Fig .3 eine Seitenansicht eines Teils der Parksperrenanordnung gemäß 2 aus einer in 2 näher angegebenen Ansicht III;
• 4 eine 3 entsprechende Darstellung der Parksperrenanordnung in ausgelegtem Betriebszustand der Parksperrenanordnung;
• 5 eine Teilschnittansicht der Parksperrenanordnung entlang einer in 4 näher angegebenen Schnittlinie V-V;
• 6 eine 3 entsprechende Darstellung der Parksperrenanordnung in eingelegtem Zustand und in notentriegeltem Betriebszustand;
• 7 eine 5 entsprechende Darstellung der Parksperrenanordnung in dem in 6 gezeigten Betriebszustand;
• 8 eine stark vereinfache Darstellung der Kinematik der Parksperrenanordnung;
• 9 eine Teilansicht einer weiteren Ausführungsform der Parksperrenanordung in eingelegtem Zustand der Parksperrenanordung; und
• 10 eine 9 entsprechende Darstellung der Parksperrenanordung in ausgelegtem Zustand der Parksperrenanordung.

It shows:

• 1 a simplified representation of an electrically driven vehicle axle of a vehicle with a parking lock arrangement;
• 2 a simplified three-dimensional representation of the parking lock arrangement of the vehicle axle according to 1 in the engaged operating state of the parking lock arrangement;
• Fig. 3 is a side view of part of the parking lock arrangement according to 2 from a 2 specified view III;
• 4 one 3 corresponding representation of the parking lock arrangement in the designed operating state of the parking lock arrangement;
• 5 a partial sectional view of the parking lock arrangement along a 4 specified section line VV;
• 6 one 3 corresponding representation of the parking lock arrangement in the engaged state and in the emergency unlocked operating state;
• 7 one 5 corresponding representation of the parking lock arrangement in the 6 shown operating state;
• 8th a highly simplified representation of the kinematics of the parking lock arrangement;
• 9 a partial view of another embodiment of the parking lock arrangement in the engaged state of the parking lock arrangement; and
• 10 one 9 corresponding representation of the parking lock arrangement in the disengaged state of the parking lock arrangement.

1 shows a highly simplified view of an electrically driven vehicle axle 1 with a drive device 2. The drive device 2 comprises an electric machine 3, an inverter 4 for the electric machine 3 and a transmission device 5. An output shaft 6 of the electric machine 3 is arranged coaxially to a transmission input shaft 7 of the transmission device 5 and is connected to it in a rotationally fixed manner.

The transmission input shaft 7 is operatively connected to a transmission output shaft 10 via gear pairs 8, 9 of the transmission device 5. The gear pairs 8 and 9 are designed as spur gears and each comprise a first spur gear 8A or 9A and a second spur gear 8B or 9B. The first spur gear 8A of the first gear pair 8 is arranged in a rotationally fixed manner on the transmission input shaft 7 and meshes with the second spur gear 8B of the first gear pair 8. The second spur gear 8B of the first gear pair 8 is arranged in a rotationally fixed manner on an intermediate shaft 51, on which the first spur gear 9A of the second gear pair 9 is mounted in a rotationally fixed manner. The first spur gear 9A of the second gear pair 9 meshes with the second spur gear 9B, which is arranged in a rotationally fixed manner on the transmission output shaft 10.

The electric machine 3, the inverter 4 and the transmission device 5 are arranged in a transmission housing 11 or in a housing of the drive device 2. An intermediate wall 12 separates the interior of the transmission housing 11 into an oil-free interior space 13 and an interior space 14 that is supplied with oil.

When the drive device 2 is switched off, no torque is applied to the transmission input shaft 7 by the electric machine 3, so that the transmission output shaft 10 can rotate freely. In order to prevent a vehicle equipped with the electrically driven vehicle axle 1 from accidentally rolling away when parked, particularly on a slope, the transmission device 5 additionally comprises a parking lock arrangement 15.

The transmission output shaft 10 can be fixed in rotation via the parking lock arrangement 15. For this purpose, the parking lock arrangement 15 comprises a drive device 16 with an electric motor 16A. A 2 in a side view shown parking lock mechanism 17 can be actuated. The parking lock mechanism 17 includes, among other things, a locking element 18, which is designed as a so-called pawl. The locking element 18 can be brought into engagement or disengaged with a parking lock wheel 19 by corresponding actuation on the electric motor side. The parking lock wheel 19 is in the 1 illustrated embodiment of the electrically driven vehicle axle 1 is arranged in a rotationally fixed manner on the transmission input shaft 7.

In order to prevent the drive device 16 and the electric motor 16A from malfunctioning due to the ingress of oil into a housing 20 of the electric machine 16A, the electric machine 16A is firmly attached to the partition wall 12 on the side of the partition wall 12 that faces the oil-free interior 13. To actuate the parking lock mechanism 17, the electric motor 16A passes through the partition wall 12 with its drive shaft 21. In order to prevent undesired oil from entering the interior 14 that is loaded with oil through the In order to avoid penetration of the intermediate wall 12 into the oil-free interior 13, a sealing unit (not shown in detail) is provided between the drive shaft 21 of the electrical machine 16A and the intermediate wall 12.

In addition to the electrical machine 16A, an electrical plug unit 22 is arranged in the oil-free interior 13, via which the electrical machine 16A can be controlled and operated in the desired manner. In addition, a lifting magnet 23 is also firmly attached to the intermediate wall 12 in the oil-free interior 13.

The parking lock mechanism 17 is designed with a first drive element 24, which in the 2 is in engagement with a gear 26 via a toothing 25 in the manner shown in more detail. The gear 26 is connected in a rotationally fixed manner to the drive shaft 21 of the electric motor 16A. A second drive element 27 is operatively connected to the first drive element 24 via a spring unit 28 which is supported on both the first drive element 24 and the second drive element 27 and is preloaded between the two in the assembled state. The first drive element 24 can be pivoted by the drive device 16 about a fixed axis of rotation 29. The second drive element 27 can be connected in a rotationally fixed manner to the first drive element 24 via a locking device 30 and can then be pivoted together with the first drive element 24 about the axis of rotation 29.

In addition, the parking lock arrangement 15 comprises an actuating element 31, which can be brought into engagement or disengaged from the locking element 18 depending on a pivoting movement of the second drive element 27. A rotary movement of the transmission input shaft 7 can be blocked via the locking element 18 when the locking element is positively engaged with the parking lock gear 19 in the 2 In contrast, a rotary movement of the transmission input shaft 7 is released by the locking element 18 when the locking element 18 is in the 4 is disengaged from the parking lock gear 19 in the manner shown.

The second drive element 27 is connected to the actuating element 31 via an actuating rod 32. A spring element 33 and the actuating element 31, which is spring-loaded thereby and arranged so as to be longitudinally displaceable on the actuating rod 32, are provided on the actuating rod 32.

2 and 3 show the parking lock arrangement 15 in the engaged state and in the so-called normal operating state, in which the first drive element 24 is connected in a rotationally fixed manner to the second drive element 27 via the locking device 30. The locking device 30 can be actuated via the lifting magnet 23 in the manner described in more detail later.

In addition, the parking lock arrangement 15 is in 4 shown in the designed operating state, in which a positive connection between the locking element 18 and the parking lock gear 19 is canceled by corresponding electric motor-side actuation of the first drive element 24 and the second drive element 27 connected thereto in a rotationally fixed manner. In this state, the locking element 18 is held out of engagement with the parking lock gear 19 by a further spring unit 34 that is operatively connected to the locking element 18. The spring unit 34 is designed as a torsion spring that is supported both on the locking element 18 and on the second drive element 27. The actuating element 31 is arranged in the present case between a guide element 35 which is fixed to the housing and firmly connected to the intermediate wall 12 and on a side 36 of the locking element 18 facing away from the parking lock gear 19 and rests with a conical region 37 on a tapered slope 35A of the guide element 35 and on a tapered slope 38 of the locking pawl or the locking element 18.

To engage the parking lock arrangement 15, the electric machine 16A rotates the drive shaft 21 and the gear wheel 26 connected thereto in a rotationally fixed manner. This causes the first drive element 24 to pivot about the rotation axis 29 in the direction of rotation DR1. Since the second locking element 27 is in the 5 is firmly connected to the first drive element 24 in the manner shown in more detail both in the area of a bolt-like extension 39 of the first drive element 24 and in the area of a locking element 40 of the locking device 30, the second drive element 27 is pivoted by the electric motor 16A together with the first drive element 24 about the axis of rotation 29 in the direction of rotation DR1. This results in the actuating rod 32 being adjusted in the direction of the actuating element 31. The spring element 33 is compressed until the actuating element 31 is displaced against the spring force of the spring element 33 along the slope 38 of the locking element 18 and along the slope 35A of the guide element 35. The locking element 18 is then guided into engagement with the parking lock gear 19 against the spring force of the spring unit 34. This is the case when the two drive elements 24 and 27 are adjusted by the electric machine 16A in the pivoting direction DR1 to such an extent that an actuating force which is impressed on the locking element 18 by a spring leg 34A of the spring unit 34 drops to a level that the Locking element 18 can be pivoted about a rotation axis 41 and guided into engagement with the parking lock gear 19.

The locking element 40 passes through the intermediate wall 12 and the first drive element 24, is arranged coaxially to the axis of rotation 29 and is designed to be longitudinally displaceable in the direction of the axis of rotation 29. In the 5 In the operating state shown, the lifting magnet 23 is de-energized and the locking element 40 is held in engagement with the second drive element 27 by a spring not shown in detail in the drawing. Furthermore, 5 It can be seen that the first drive element 24 is rotatably mounted in the intermediate wall 12 via a bearing unit 48 designed as a rolling bearing. Depending on the respective application, it is possible for the bearing unit 48 to also be designed as a plain bearing.

The bolt-like extension 39 passes through the second drive element 27 in the area of two legs 27C, 27D, which are spaced apart from one another in the direction of the further axis of rotation 45. In the present case, the spring unit 28 is also arranged on the bolt-like extension 39 between the legs 27C and 27D, in the area of which tilting moments acting on the second drive element 27 can be supported in a simple manner.

When the parking lock arrangement 15 is engaged, the first drive element 24 rests against a housing-side stop 42 and the second drive element 27 rests against a housing-side stop 43. In contrast, when the parking lock arrangement 15 is in the disengaged operating state, the first drive element 24 rests against another housing-side stop 44, so that the first drive element 24 has a defined position even when the parking lock arrangement 15 is in the disengaged state.

If the parking lock arrangement 15 is to be transferred to the designed operating state, the first drive element 24 is adjusted accordingly by the electric machine 16A about the axis of rotation 29 in the pivoting direction or direction of rotation DR2, which also results in a pivoting of the second drive element 27 about the axis of rotation 29. The pivoting of the second drive element 27 about the axis of rotation 29 results in the actuating rod 32 guiding the actuating element 31 out of engagement with the bevel 38 of the locking element 18 and with the bevel 35A of the guide element and the locking element 18 being brought out of engagement with the parking lock gear 19 by the engaging spring unit 34.

If, in the designed operating state of the parking lock arrangement 15, a malfunction is detected in the area of the drive device 16, which does not allow the parking lock arrangement 15 to be engaged by the electric machine 16A, and if there is a corresponding request to engage the parking lock arrangement 15, the lifting magnet 23 is electrically controlled accordingly. The lifting magnet 23 then moves the locking element 40 against the acting spring force out of engagement with the second actuating element 27. This operating state of the locking element 40 is in 7 shown in more detail.

Since the operative connection between the gear 26 and the toothing 25 of the first drive element 24 is self-locking in the present case, the first drive element 24 remains in the 4 shown pivot position, which corresponds to the designed operating state of the parking lock arrangement 15. By pulling the locking element 40 out of engagement with the second drive element 27, the rotationally fixed connection between the first drive element 24 and the second drive element 27 in the area of the axis of rotation 29 is released. This leads to the second drive element 27 being released from the position shown in FIG. 1 by the spring unit 28 arranged between the two drive elements 24 and 27 in a pre-tensioned state. 4 shown pivot position about the bolt-like extension 39 in the direction of rotation DR1 until the second drive element 27 comes to rest against the stop 43 on the housing side.

Through this pivoting movement of the second drive element 27 about a rotation axis 45 present in the area of the bolt-like extension 39, the actuating element 31 is pushed in the manner described in more detail above between the guide bevel 35A of the guide element 35A and the guide bevel 38 of the locking element 18. This creates a positive connection between the locking element 18 and the parking lock wheel 19.

In order to be able to return the parking lock arrangement 15, which has been released in this way, to the designed operating state if necessary, an actuating force F can be applied to the second drive element 27 via a corresponding device in order to impart a rotary movement to the second drive element 27 in the direction of rotation DR2 about the axis of rotation 45. This rotary movement causes the second drive element 27 to come to rest against a further stop 46 from a certain angle of rotation, which is provided on the first drive element 24 and limits the rotary movement of the second actuating element 27 about the axis of rotation 45. The further stop 46 is positioned in such a way that a bore 47 of the second drive element 27, which is provided for receiving the locking element 40, exactly next to the locking element 40 and the locking element 40 is spring-actuated and moves into the bore 47. The parking lock arrangement 15 is thus disengaged again and the transmission input shaft 7 can rotate.

The actuating force F can be applied mechanically as a compressive or tensile force to the second drive element 27 in order to transfer the parking lock arrangement 15 into the designed operating state.

In addition, it is also possible to return the emergency-released parking lock arrangement 15 to the designed operating state once the drive device 16 has been restored to its proper functioning by actuating the first drive element 24 accordingly on the part of the electric machine 16A. If the first drive element 24 is pivoted by the electric motor 16A in the direction of rotation DR1, this leads to the stop 46 coming into contact with the second drive element 27 and the second drive element 27 being adjusted together with the bolt-like extension 39 until the bore 47 overlaps the locking element 40 and the locking element snaps into the bore 47.

The actuating element 31 is actuated in the manner described above in more detail about the rotation axis 29 during normal operation of the parking lock arrangement 15. During emergency operation of the parking lock arrangement 15, the actuating element 31 is adjusted to the extent described about the further rotation axis 45. The two rotation axes 29 and 45 as well as the area 27A of the second drive element 27 are shown in the following 8th The parking brakes 15 and 16 are positioned relative to one another and spaced apart from one another in a manner described in more detail such that a connection point 50 of the actuating rod 32 assumes essentially the same position in the engaged state of the parking brake arrangement 15, regardless of whether the parking brake arrangement 15 is engaged in normal operation or in emergency operation. This position of the connection point 50 is in 8th identified in more detail under the reference symbol 50E. The position that the connection point 50 assumes in the designed operating state of the parking lock arrangement 15 is shown in 8th identified in more detail under the reference symbol 50A. Depending on this specification, a vertical distance 50AE is also designed between the positions 50A and 50E.

During an operating state of the parking lock arrangement 15 starting from the designed state and in normal operation of the parking lock arrangement 15, the connection point 50 is transferred on the circular path of the circle K50N from the position 50A to the position 50E. The center of the circle K50N lies on the axis of rotation 29 of the first drive element 24. At the same time, the axis of rotation 45 is transferred from the position 45A to the position 45E along the circular path of the circle K45N in normal operation of the parking lock arrangement 15.

If the parking lock arrangement 15 is designed and there is a request to engage the parking lock arrangement 15, the rotation axis 45 remains in position 45A in emergency operation. As soon as the locking element 40 is guided out of engagement with the bore 47 of the second drive element 27, the second drive element 27 is pivoted by the spring unit 29 about position 45A of the rotation axis 45 in the manner described above relative to the first drive element 24. This causes the connection point 50 to be adjusted from position 50A to position 50E along the circular path of the further circle K50NB, the center of which corresponds to position 45A of the rotation axis 45. In addition, the bore 47 of the second drive element 27 is moved around the position 45A of the axis of rotation 45 along the circular path of the additional circle K47NB from the position 47N, in which the bore 47 is in alignment with the locking element 40, to the position identified in more detail under the reference symbol 47NB.

A connecting line 29-50 through the rotation axis 29 and the position 50E, which the connection point 50 assumes when the parking lock arrangement 15 is in the engaged operating state, is located approximately in the middle between the positions 45A and 45N of the pivot axis 45. This means that the pivot axis 45 is pivoted by the same pivot angle α in position 45A and in position 45E relative to the connecting line 29-50. This ensures that the connection point 50 is always arranged in position 50E when the parking lock arrangement 15 is engaged in normal operation or in emergency operation.

This is advantageous because the actuating element 31 is then always controlled to the same extent by the parking lock mechanism 17, regardless of whether the parking lock arrangement 15 is engaged in normal operation or in emergency operation.

9 and 10 show a partial representation of a further embodiment of a parking lock device 151, which differs from the parking lock arrangement 15 essentially only in the area of the spring unit 34 and its support on the second drive element 27. For this reason, in the following description of 9 and 10 only the differences between the parking lock arrangements 15 and 151 are explained in more detail. Otherwise, of the basic structural design and the basic functionality of the parking lock arrangement 151 to the above description. 1 until 8th and, for the sake of clarity, the same reference symbols are used for components with the same construction and function.

The spring unit 34 of the parking lock arrangement 151 is in the engaged state of the parking lock arrangement 151 with its leg 34B in the 9 shown manner, is disengaged from the second drive element 27. In other words, the spring unit 34 is not supported on the second drive element 27 when the parking lock arrangement 151 is engaged. As a result, the spring unit 34 is switched off and the locking element 18 can be brought into engagement with the parking lock gear 19 without having to overcome the spring force of the spring unit 34.

In this operating state of the parking lock arrangement 151, the spring unit 34 is nevertheless under prestress, since the leg 34A of the spring unit 34 is supported on the locking element 18 and the leg 34B is supported on a stop region 18A of the locking element 18.

If the second drive element 27 is adjusted in the direction of rotation DR2 to disengage the parking lock arrangement 151, the second drive element 27 comes into contact with the leg 34B of the spring unit 34 with a contact area 27B from a defined pivot angle. If the second drive element 27 is adjusted further in the direction of rotation DR2, this leads to the leg 34B lifting off the stop area 18A and the locking element 18 being spring-loaded by the spring unit 34 in the direction of its position, which the locking element 18 assumes when the parking lock arrangement 151 is disengaged and the locking element 18 is disengaged from the parking lock gear 18.

In the embodiment shown in the drawing, the axes of rotation 29, 41 and 45 and the drive shaft 21 of the electric motor 16A run parallel to one another. Furthermore, the first drive element 24, the second drive element 27, the locking element 18, the parking lock gear 19 and the actuating rod 32 lie in planes that are parallel to one another and are essentially only a short distance apart. This offers the possibility of designing the parking lock arrangement 15 in the direction of the pivot axis 29 with a small installation space requirement.

Reference symbols

1

Vehicle axle

2

Drive device

3

electric machine

4

Inverter

5

Gearbox device

6

Output shaft of the electric machine 3

7

Gearbox input shaft

8th

first gear pairing

8A

first spur gear of the first gear pair

8B

second spur gear of the first gear pair

9

second gear pair

9A

first spur gear of the second gear pair

9B

second spur gear of the second gear pair

10

Gearbox output shaft

11

Gearbox housing or drive device housing

12

Partition wall

13

oil-free interior

14

interior contaminated with oil

15

Parking lock arrangement

151

Parking lock arrangement

16

Drive system

16A

electric machine

17

Parking lock mechanism

18

Locking element

18A

Stop area

19

Parking lock wheel

20

Housing of the electrical machine 16A

21

Drive shaft of the electric machine 16A

22

electrical plug unit

23

Lifting magnet

24

first drive element

25

Gearing of the first drive element

26

Drive shaft gear 21

27

second drive element

27A

Area of the second drive element

27B

Contact area of the second drive element

27C, 27D

Leg of the second drive element

28

Spring unit between the drive elements

29

fixed axis of rotation of the first drive element 24

30

Locking device

31

Actuator

32

Operating rod

33

Spring element on the operating rod

34

Spring unit between the second drive element and the locking element

34A

Spring leg of spring unit 34

34B

Spring leg of spring unit 34

35

Guide element

35A

Inclination of the guide element

36

Side of the locking element 18

37

conical area of the actuating element

38

tapered slope of the locking element

39

bolt-like extension of the first drive element

40

Locking element of the locking device 30

41

Rotation axis of the locking element 18

42

Housing-side stop of the first drive element 24

43

Housing-side stop of the second drive element 27

44

further housing-side stop of the first drive element 24

45

further axis of rotation of the second drive element 27

45A

Position of the rotation axis 45 in normal operation of the parking lock arrangement with the parking lock arrangement simultaneously disengaged and in emergency operation of the parking lock arrangement with the parking lock arrangement simultaneously engaged

45E

Position of the rotation axis 45 in normal operation of the parking lock arrangement with the parking lock arrangement engaged at the same time

K45N

Circle on whose circular path the axis of rotation 45 pivots during normal operation of the parking lock arrangement

46

further stop of the second drive element 27

47

Bore of the additional drive element 27

47N

Position of hole 47 in normal operation of the parking lock arrangement

47NB

Position of hole 47 in emergency operation of the parking lock arrangement

K47NB

Circle on whose circular path the bore 47 pivots

48

Storage unit

50

Connection point of the actuating rod to the second drive element

50A

Position of the connection point 50 in the disengaged state of the parking lock arrangement 15

50B

Position of the connection point 50 in the engaged state of the parking lock arrangement

50AE

vertical distance between positions 50A and 50E

K50N

Circle on whose circular path the connection point 50 pivots during normal operation of the parking lock arrangement

K50N B

Circle on whose circular path the connection point 50 pivots in the emergency operation of the parking lock arrangement

29-50

Connecting line

51

Intermediate shaft

DR1, DR2

Direction of rotation

F

Actuating force

α

Swivel angle

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely to provide the reader with better information. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• DE 102019001189 A1 [0002]

Claims (13)

Parking lock arrangement (15) - with a drive device (16), - with a first drive element (24) which can be pivoted by the drive device (16) about a fixed axis of rotation (29), - with a second drive element (27) which is operatively connected to the first drive element (24) via a spring unit (28) and can be connected to the first drive element (24) in a rotationally fixed manner via a locking device (30) and can be pivoted together with the first drive element (24) about the axis of rotation (29) of the first drive element (24), - and with an actuating element (31) which, depending on a pivoting movement of the second drive element (27), can be brought into engagement with or out of engagement with a locking element (18), via which a rotational movement of a shaft (7) can be blocked and released, - characterized in that - the second drive element (27) can be pivoted by the spring unit (28) about a further axis of rotation (45) relative to the first drive element (24) when the locking device (30) is deactivated. the first drive element (24) is pivotable, - wherein the further axis of rotation (45) is fixed to the first drive element (24) and is spaced from the axis of rotation (29) of the first drive element (24). Parking lock arrangement according to Claim 1 , characterized in that the drive device (16) comprises an electric motor (16A), the drive shaft (21) of which is connected in a rotationally fixed manner to a gear wheel (26) which is in engagement with a toothing (25) of the first drive element (24). Parking lock arrangement according to Claim 2 , characterized in that the tooth engagement between the gear wheel (26) and the toothing (25) of the first drive element (24) is self-locking. Parking lock arrangement according to one of the Claims 1 until 3 , characterized in that the drive elements (24, 27) are designed as discs or levers. Parking lock arrangement according to at least one of the preceding claims, characterized in that the axis of rotation (29) of the first drive element and the further axis of rotation (45) are parallel to one another. Parking lock arrangement according to at least one of the preceding claims, characterized in that the spring unit (28) is designed as a torsion spring which is arranged between the two drive elements (24, 27) so as to act around the further axis of rotation (45) and is supported at one end on the first drive element (24) and at the other end on the second drive element (27), wherein the spring unit (28) between the drive elements (24, 27) is prestressed in such a way that the spring unit (28) applies a spring force to the second drive element (27) which acts on the second drive element (27) in the direction of a position of the second drive element (27) which the second drive element (27) has when the locking element (18) blocks the rotary movement of the shaft (7). Parking lock arrangement according to at least one of the preceding claims, characterized in that the locking device (30) has a lifting magnet (23) by means of which a locking element (40) can be guided against a spring out of engagement with the second drive element (27), wherein the locking element (40) is longitudinally displaceable along the axis of rotation (29). Parking lock arrangement according to at least one of the preceding claims, characterized in that a pivot angle range of the first drive element (24) is limited by stops (42, 44) both in the direction of a position of the first drive element (24) which the first drive element (24) has when the locking element (18) blocks the rotary movement of the shaft (7), and in the direction of a position of the first drive element (24) which the first drive element (24) assumes when the locking element (18) releases the rotary movement of the shaft (7). Parking lock arrangement according to at least one of the preceding claims, characterized in that a pivot angle range of the second drive element (27) is limited by stops (43, 46) both in the direction of a position of the second drive element (27) which the second drive element (27) has when the locking element (18) blocks the rotary movement of the shaft (7), and in the direction of a position of the second drive element (27) which the second drive element (27) assumes when the locking element (18) releases the rotary movement of the shaft (7). Parking lock arrangement according to Claim 9 , characterized in that the stop (46) which limits the pivoting angle range of the second drive element (27) in the direction of the position of the second drive element (27) which the second drive element (27) assumes when the locking element (18) releases the rotary movement of the shaft (7), is provided in the region of the first drive element (24). Parking lock arrangement according to Claim 10 , characterized in that the second drive element (27), in its pivoted position relative to the first drive element (24), can be transferred from the first drive element (24) by means of the stop (46) in the region of the first drive element (24) into the pivoted position in which the two drive elements (24, 27) are connected to one another by the locking element (40). Parking lock arrangement according to at least one of the preceding claims, characterized in that a further spring unit (34) acts on the locking element (18) in the direction of the position of the locking element (18), which the locking element (18) has when the locking element (18) releases the rotary movement of the shaft (7), wherein the further spring unit (34) is supported on the locking element (18) and on the second drive element (27). Parking lock arrangement according to Claim 12 , characterized in that the further spring unit (34) assigned to the locking element (18) acts on the second drive element (27) and on the locking element (18) in such a way that the spring characteristic curve of the further spring unit (34) has a degressive course.

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