Electric Drive with a Parking Lock Device, and Axle Drive Assembly Comprising the Electric Drive for a Motor Vehicle

Abstract

An electric drive for a motor vehicle includes: a drive housing with a motor housing section and a motor chamber. A stator and a rotor, the rotor being rotatably mounted relative to the stator by a rotor shaft, are arranged in the motor chamber. The electric drive also includes a parking lock with an engagement mechanism configured to lock the rotor shaft relative to the drive housing is arranged in the electric drive.

Claims

1-10. (canceled)

11. An electric drive (10) for a motor vehicle, comprising: a drive housing (12) having a motor housing portion (14), which defines a motor compartment (14a); a stator (16), arranged in the motor compartment (14a); and a rotor (18), wherein the rotor (18) is mounted by a rotor shaft (20) so as to be rotatable with respect to the stator (16), wherein the electric drive (10) has a parking lock (30) having an engagement mechanism (32) for locking the rotor shaft (20) relative to the drive housing (12).

12. The electric drive as claimed in claim 11, wherein the parking lock (30) has an actuating device (32) for activating the engagement mechanism (32), which actuating device is fixed to the drive housing (12).

13. The electric drive as claimed in claim 12, wherein the drive housing (12) has a parking lock housing portion (50) having a parking lock compartment (50a), wherein the engagement mechanism (32) of the parking lock (30) is accommodated in the parking lock compartment (50a).

14. The electric drive as claimed in claim 13, wherein the parking lock compartment (50a) is configured to be separate from the motor compartment (14a).

15. The electric drive as claimed in claim 14, wherein the actuating device (40) is configured to provide electromechanical actuation and comprises an actuating drive (46), which is arranged inside the drive housing (12).

16. The electric drive as claimed in claim 15, wherein the engagement mechanism (32) has a parking lock wheel (34), which is arranged on the rotor shaft (20) and has latching teeth (34a), and a pawl (36), which is fixed to the drive housing (12), cooperates with said latching teeth and is controllable by the actuating device (40).

17. The electric drive as claimed in claim 16, wherein the parking lock housing portion (50) has an assembly flange for connection to a housing (66) of a drive train component (62) of a vehicle.

18. An axle drive arrangement (100) for a motor vehicle, comprising an electric drive (10) as claimed in claim 17, wherein the housing (66) is configured as a gear housing of a gear arrangement (64) and is connected to the parking lock housing portion (50) of the drive housing (12), and wherein the gear arrangement (64) comprises a gear input shaft (68), which is operatively connected to the rotor shaft (20), and at least one gear output shaft (70a, 70b), which is operatively connected to vehicle wheels so as to transmit a drive torque from the drive (10).

19. The axle drive arrangement (100) as claimed in claim 18, wherein the gear arrangement (64) comprises a reduction gear (641) and/or an axle differential gear (642).

20. The axle drive arrangement (100) as claimed in claim 18, wherein the gear output shaft (70a, b) is configured as a wheel drive shaft.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The invention will be explained by way of example below, with reference to an embodiment which is illustrated in the figures, in which:

[0019] FIG. 1 shows an axle drive arrangement for a motor vehicle having an electric drive and having a gear arrangement;

[0020] FIG. 2 shows an axial sectional illustration of the electric drive of FIG. 1, with a parking lock device; and

[0021] FIG. 3 shows an end-face view of the electric drive of FIG. 2, looking onto the parking lock device.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

[0022] FIG. 1 shows an axle drive arrangement 100 for an electrically driven motor vehicle, which axle drive arrangement comprises an electric drive 10 and a gear arrangement 64 which is connected to said electric drive, whereby a drive torque can be transmitted to vehicle wheels (not represented graphically).

[0023] The electric drive 10 shown in FIGS. 2 and 3 is configured as an internal electric machine and has a drive housing 12, which forms a motor housing portion 14 with a motor compartment 14a. A stator 16 and a rotor 18 are arranged in the motor compartment 14a in a conventional manner. To this end, the stator 16 is fixed to the motor housing portion 14 and the rotor 18 is mounted by a rotor shaft 20 and by bearings 15a, 15b, which are located on end shields 14b, c, such that it is rotatable with respect to the stator 16.

[0024] The electric drive 10 further has a parking lock device 30, whereby the vehicle wheels and the torque-transmitting components of the drive train which are in operative communication with said drive wheels can be blocked. In the present case, the parking lock device 30 has an engagement mechanism 32 for locking the rotor shaft 20 relative to the drive housing 12. The engagement mechanism 32 comprises a parking lock wheel 34, which is arranged on the rotor shaft 20 in a rotationally fixed manner and has latching teeth 34a, and a pawl 36, which is pivotably fixed on the drive housing 12, cooperates with the latching teeth and can be controlled or activated by an actuating device 40, which is likewise fixed to the drive housing 12. The actuating device 40 is configured for electromechanical actuation and, to this end, comprises an actuating drive 46, which is arranged inside the drive housing 12, or a parking lock actuator 46, which, via a mechanical transmission chain having a reduction gear, a screw drive and a rotating ramp, converts a rotational movement of the actuating drive 46 into a translatory movement of a detent 47, which is mostly covered in FIG. 3 and is therefore partially illustrated by a dashed line. As a result, the pawl 36 is brought into engagement with a tooth gap 34b of the latching teeth 34a of the parking lock wheel 34 as a result of an axial displacement of the detent 48. For emergency actuation of the parking lock device 30, an electromagnetic emergency unlocking actuator 38 is provided on the outside of the parking lock housing portion 50, which emergency unlocking actuator engages in the parking lock compartment 50a by a tension rod 48a and brings about an unlocking of the parking lock device 30 upon its actuation.

[0025] As can be seen in the figures, the drive housing 12 has a parking lock housing portion 50, which is configured in one part with the motor housing portion 14 here and has a parking lock compartment 50a in which the above-mentioned engagement mechanism 32 and elements of the actuating device 21 are accommodated. In the exemplary embodiment addressed here, the parking lock compartment 50a is configured to be separate from the motor compartment 14a, although this is not compulsory. The elements of the electric machine, i.e. the stator 16 and the rotor 18, can alternatively also be located in a common compartment, at least with the elements of the engagement mechanism 32 and furthermore possibly with the elements of the actuating device 40.

[0026] As can furthermore be seen in FIGS. 1-3, the parking lock housing portion 50 has an assembly flange 52 for producing a connection, in particular a screw connection, to the gear housing 66 of the gear arrangement 64, which assembly flange which is formed around the rotor shaft 52. The gear arrangement 64 furthermore comprises a gear input shaft 68, which is connected to the rotor shaft 20 in a rotationally fixed manner in the region of the partition point of the two housings or housing portions 50, 66. In the exemplary embodiment addressed here, the gear arrangement 64 has a reduction gear 641 and a subsequent axle differential gear 642 having two gear output shafts 70a, b configured as wheel drive shafts. The gear output shafts 70a, 7-b are operatively connected to vehicle wheels in order to transmit a drive torque originating from the drive 10.

[0027] Although exemplary embodiments have been discussed in the above description, it should be noted that numerous modifications are possible. Furthermore, it should be noted that the exemplary embodiments are merely examples which are not intended to limit the scope of protection, the applications and the structure in any way. Rather, a person skilled in the art will take from the above description a guideline for implementation of at least one exemplary embodiment, wherein various modifications may be made, in particular with regard to the function and arrangement of the described components, without departing from the scope of protection as can be gathered from the claims and equivalent feature combinations

REFERENCE SIGNS

[0028] 10 Electric drive [0029] 12 Drive housing [0030] 14 Motor housing portion [0031] 14a Motor compartment [0032] 14b, c End shield [0033] 15a, b Bearing [0034] 16 Stator [0035] 18 Rotor [0036] 20 Rotor shaft [0037] 30 Parking lock device [0038] 32 Engagement mechanism [0039] 34 Parking lock wheel [0040] 34a Latching teeth [0041] 34b Tooth gap [0042] 36 Pawl [0043] 40 Actuating device [0044] 46 Actuating drive [0045] 47 Detent [0046] 48 Emergency unlocking actuator [0047] 48a Tension rod [0048] 50 Parking lock housing portion [0049] 50a Parking lock compartment [0050] 52 Assembly flange [0051] 62 Drive train components [0052] 64 Gear arrangement [0053] 641 Reduction gear [0054] 642 Axle differential gear [0055] 66 Gear housing [0056] 68 Gear input shaft [0057] 70a, b Gear output shaft [0058] 100 Axle drive arrangement