Wheel drive device and motor vehicle

Abstract

The invention relates to a wheel drive device for a motor vehicle, having a wheel hub (2) mounted rotatably about a wheel axis of rotation (18), having a joint housing (1) which has a joint cap (6) and a journal (3) connected fixedly to the joint cap (6) so as to rotate with it, and having a toothing device (7) which has a wheel-hub-side first toothing and a second toothing arranged on an outer circumference of the journal (3), wherein the first toothing is in engagement with the second toothing, as a result of which the wheel hub (2) is connected to the joint housing (1) so as to rotate with it, wherein in an axial region of the toothing device (7) the wheel hub (2) radially surrounds the journal (3), wherein the journal (3) has a first circumferential groove (11) on a side of the toothing device (7) facing away from the joint cap (6) with regard to a direction of the wheel axis of rotation (18), in which groove a securing ring (12) is arranged for axially securing the wheel hub (2) with respect to the wheel housing (1).

Description

[0001] Wheel drive device and motor vehicle

[0002] The invention relates to a wheel drive device for a motor vehicle according to the preamble of claim 1 and to a motor vehicle according to claim 8.

[0003] In motor vehicles, especially electrically powered vehicles, clicking noises can occur during acceleration and load changes. These clicking noises are particularly likely to occur at the contact surface of a wheel bearing with a side shaft or lateral drive shaft.

[0004] It is known to use an anti-cracking disc. A disadvantage is that an additional component is required. It is also known to molycoat the contact surfaces. However, this does not completely solve the problem and requires an additional work step. Furthermore, face gears are known.

[0005] DE 10 2006 030682 A1 describes a wheel hub constant velocity joint unit in which a wheel hub with a through-hole carrying an internal shaft toothing is clamped to the joint housing of a constant velocity joint, on which a pin with an external shaft toothing is integrally formed, wherein the internal shaft toothing of the through-hole and the external shaft toothing of the pin mesh and a double-row wheel bearing is pushed onto the wheel hub, which includes an inner bearing ring on which an end face of the joint housing is directly supported, wherein the pitch circle diameter of the rolling bearing is larger than the pitch circle diameter of the constant velocity joint. Similar wheel hub constant velocity joint units are known from DE 10 2020 100 157 Al and DE 102015 211456 Al, in both cases where a retaining ring is used to axially secure the wheel hub to the joint housing.The object of the present invention is to provide a novel wheel drive device for a motor vehicle and a novel motor vehicle.

[0006] The problem is solved according to the invention by a wheel drive device for a motor vehicle with the features of claim 1 and by a motor vehicle with the features of claim 8.

[0007] Advantageous embodiments of the invention are the subject of the dependent claims.

[0008] A wheel drive device for a motor vehicle is proposed, comprising a wheel hub rotatably mounted about a wheel axis of rotation, a joint housing having a joint bell and a pin non-rotatably connected to the joint bell, and a gearing device having a first toothing on the wheel hub side and a second toothing arranged on an outer circumference of the pin, wherein the first toothing engages with the second toothing, thereby non-rotatably connecting the wheel hub to the joint housing, and wherein in an axial region of the gearing device the wheel hub radially surrounds the pin. According to the invention, the pin has a first circumferential groove on a side of the gearing device facing away from the joint bell, with respect to a direction of the wheel axis of rotation, in which a retaining ring is arranged for axially securing the wheel hub to the joint housing.

[0009] In the prior art, particularly in electric drives, a clicking noise occurs during dynamic load changes in the area of ​​a collar on the wheel hub, often also referred to as a crimp, especially due to a sudden torque transmission from the joint housing to the collar. This clicking noise is prevented by the solution according to the invention.

[0010] In the context of the present application, the term “rotationally fixed” is used as follows: Two rotatably mounted elements are rotationally fixed to each other if they are arranged coaxially to each other and are connected to each other in such a way that they rotate at the same angular velocity.

[0011] The terms "axial" and "radial" refer to the wheel's axis of rotation. The term "axial region" refers to a region of extension (here, the region of extension of the gearing device) in the axial direction. This region is thus to be understood as a spatial region that extends axially from the beginning to the end of the gearing device and extends infinitely in the other two spatial directions.

[0012] The wheel hub, joint housing, and pin are all arranged coaxially. The first and second toothed sections are axially overlapping, meaning they are located within a region of identical axial coordinates.

[0013] In one embodiment, the wheel hub has a contact surface arranged perpendicular to the direction of the wheel's axis of rotation for contact with the retaining ring.

[0014] In one embodiment, a sealing ring is arranged on an outer circumference of the joint housing on a side of the gearing device facing the joint housing with respect to the axial direction, to seal a gap between the wheel hub and the joint housing.

[0015] In one embodiment, a second circumferential groove or a support ring for receiving the sealing ring is arranged on the outer circumference of the joint housing.

[0016] In one embodiment, a rolling bearing is arranged in an axial area between the sealing ring and the retaining ring on an outer circumference of the wheel hub with respect to the direction of the wheel's axis of rotation.

[0017] In one embodiment, the wheel hub has a radially outwardly directed collar at one of its axial ends facing the ball joint, with the collar abutting the sealing ring. The collar of the wheel hub is often also referred to as a crimp.

[0018] According to one aspect of the present invention, a multi-wheeled motor vehicle is proposed, comprising one or more of the wheel drive devices described above. The motor vehicle may, for example, have at least one electric drive and / or an internal combustion engine.

[0019] The motor vehicle can be, for example, a passenger car, a commercial vehicle or a bus.

[0020] The present invention proposes to fix at least one side shaft or side drive shaft of the motor vehicle without preload via a retaining ring (for example according to DIN 471 or in a similar design) and to decouple the wheel bearing preload from the assembly.

[0021] This prevents a stick-slip effect between the wheel bearing and the driveshaft. To prevent moisture from entering the splines, a sealing ring can be inserted between the driveshaft contour and the collar (flanged contour) of the wheel bearing.

[0022] This prevents cracking noises during start-up and load changes. A normally required bolting process during assembly is no longer necessary.

[0023] Exemplary embodiments of the invention are explained in more detail below with reference to a drawing.

[0024] This shows:

[0025] Fig. 1 a schematic view of a joint housing of a side shaft of a

[0026] Motor vehicle according to the state of the art, which is in engagement with a wheel hub of a wheel of the motor vehicle.

[0027] Figure 1 is a schematic view of a joint housing 1 of a side shaft or lateral drive shaft of a motor vehicle, for example, a passenger car, a commercial vehicle, or a bus, particularly with an electric drive and / or an internal combustion engine. The joint housing 1 has a joint bell 6 and a pin 3 that engages in a wheel hub 2 of a wheel of the motor vehicle, in particular in an axial receptacle 4 of the wheel hub 2. The pin 3 and the axial receptacle 4 are connected to each other in a rotationally fixed manner by a toothed device 7. For this purpose, the pin 3 and the axial receptacle 4 have complementary, for example, straight, toothed sections by which the axial receptacle 4 is connected to the pin 3 in a rotationally fixed manner. The pin 3 may have an axial bore 5 with an internal thread into which a central screw (not shown) with an external thread could be screwed.However, this is not required in the present invention.

[0028] The wheel hub 2 can have an end face 9 on an inner surface facing towards the side shaft. The joint housing 1 can also have an end face 10 at the level of a projection of the pin 3, which, when the pin 3 is inserted into the receptacle 4, is opposite the end face 9, but does not necessarily abut it.

[0029] The pin 3 has a first circumferential groove 11 on a side of the gearing device 7 facing away from the joint housing 6, with respect to a direction of a wheel rotation axis 18. A retaining ring 12 is arranged in this groove for axially securing the wheel hub 2 against the joint housing 1. The groove 11 is advantageously designed as a radially outer recess in the pin (3) and is located axially outside the gearing device 7 and on an axial side of the gearing device 7 facing away from the joint housing 6.

[0030] Unlike in the prior art, the wheel hub 2 is therefore not pressed against the joint housing 1, but is secured more loosely against axial movement by the retaining ring 12.

[0031] The gearing device 7 can be particularly advantageously designed such that at least one of the two complementary gear teeth of the gearing device 7 is not aligned exactly parallel to the wheel axis of rotation 18, but slightly angled to it (for example, by less than 1 degree). Such an alignment can create a preload between the two complementary gear teeth within the gearing device itself, thereby enabling axial locking, at least to a limited extent.

[0032] In one embodiment, the wheel hub 2 can have a contact surface 8 arranged perpendicular to the direction of the wheel rotation axis 18 for bearing against the retaining ring 12. Furthermore, with respect to the axial direction, a sealing ring 13 can be arranged on an outer circumference of the joint housing 1 on one side of the gearing device 7 facing the joint housing 6 to seal a gap 14 between the wheel hub 2 and the joint housing 1.

[0033] In one embodiment, a second circumferential groove 15 or a support ring for receiving the sealing ring 13 can be arranged on the outer circumference of the joint housing 1.

[0034] In one embodiment, a rolling bearing 16 can be arranged in an axial area between the sealing ring 13 and the retaining ring 12 on an outer circumference of the wheel hub 2 with respect to the direction of the wheel rotation axis 18.

[0035] In one embodiment, the wheel hub 2 can have a radially outwardly directed collar 17 at one axial end of the wheel hub 2 facing the joint bell 6, wherein the collar 17 abuts the sealing ring 13.

[0036] In the prior art, particularly in electric drives, a clicking noise occurs in the area of ​​the collar 17 on the wheel hub 2 during dynamic load changes (torque transmission from the joint housing 1 via the collar 17); this clicking noise is prevented by the solution according to the invention.

[0037] Advantageously, the retaining ring 12 is arranged on an axial side of the contact surface 8 facing away from the joint housing 6, such that the arrangement of the retaining ring 12 in the groove 11 and on the contact surface 8 prevents axial separation of the wheel hub 2 and the joint housing 1. Advantageously, this eliminates the need for a screw to prevent axial separation, as is generally the case in the prior art.

[0038] Reference symbol list

[0039] 1 Joint housing

[0040] 2 Wheel hub

[0041] 3 cones

[0042] 4 recording

[0043] 5 holes

[0044] 6 Joint bell

[0045] 7 Gear cutting device

[0046] 8 Plant area

[0047] 9 Front surface

[0048] 10 Front surface

[0049] 11 Nut

[0050] 12 retaining ring

[0051] 13 Sealing ring

[0052] 14 columns

[0053] 15 Nut

[0054] 16 rolling bearings

[0055] 17 collars

[0056] 18 Wheel pivot

Claims

Patent claims 1. Wheel drive device for a motor vehicle, comprising a wheel hub (2) rotatably mounted about a wheel axis (18), a joint housing (1) having a joint bell (6) and a pin (3) non-rotatably connected to the joint bell (6), a gearing device (7) having a first toothing on the wheel hub side and a second toothing arranged on an outer circumference of the pin (3), wherein the first toothing engages with the second toothing, thereby non-rotatably connecting the wheel hub (2) to the joint housing (1), wherein in an axial region of the gearing device (7) the wheel hub (2) radially surrounds the pin (3), and a retaining ring (12) for axially securing the wheel hub (2) to the joint housing (1), characterized in that the pin (3) is located on a side of the gearing device facing away from the joint bell (6) with respect to a direction of the wheel axis (18). (7) has a first circumferential groove (11),in which the retaining ring (12) is arranged.

2. Wheel drive device according to claim 1, characterized in that the wheel hub (2) has a contact surface (8) arranged perpendicular to the direction of the wheel rotation axis (18) for contact with the retaining ring (12), wherein the retaining ring (12) is arranged on an axial side of the contact surface (8) facing away from the joint housing (6), such that the arrangement of the retaining ring (12) in the groove (11) and on the contact surface (8) prevents an axial separation movement of wheel hub (2) and joint housing (1).

3. Wheel drive device according to claim 1 or 2, characterized in that the groove (11) is formed as a radially outer recess in the pin (3) and is arranged axially outside the gearing device (7) and on an axial side of the gearing device (7) facing away from the joint bell (6).

4. Wheel drive device according to one of the preceding claims, characterized in that, with respect to the axial direction, on a side of the gearing device (7) facing the joint bell (6), a sealing ring (13) is arranged on an outer circumference of the joint housing (1) for sealing a gap (14) between the wheel hub (2) and the joint housing (1).

5. Wheel drive device according to claim 4, characterized in that a second circumferential groove (15) or a support ring for receiving the sealing ring (13) is arranged on the outer circumference of the joint housing (1).

6. Wheel drive device according to claim 4 or 5, characterized in that a rolling bearing (16) is arranged on an outer circumference of the wheel hub (2) in an axial area between the sealing ring (13) and the retaining ring (12) with respect to the direction of the wheel rotation axis (18).

7. Wheel drive device according to one of claims 4 to 6, characterized in that the wheel hub (2) has a radially outwardly directed collar (17) at one axial end of the wheel hub (2) facing the joint bell (6), wherein the collar (17) abuts the sealing ring (13).

8. Motor vehicle with multiple wheels, comprising one or more wheel drive devices according to any of the preceding claims.

Images