Bevel gear differential for an electrical drive device of a motor vehicle and electrical drive device

Abstract

The invention relates to a bevel gear differential (1) for an electrical drive device of a motor vehicle, having: - a housing block (2) designed to be rotatable about an axial direction (A) in order to transmit an input torque to at least one bevel gear device (3), - wherein the housing block (2) has at least one receptacle (4) for arranging a bevel gear device (3) on the housing block (2), - wherein the at least one receptacle (4) has an opening (5) in the axial direction (A), into which opening a bevel gear device (3) can be inserted perpendicular to the axis of rotation of the bevel gear device (3). The invention also relates to an electric drive device (10) for a motor vehicle having a bevel gear differential.

Description

[0001] Sprocket differential for an electric drive device of a motor vehicle and electric drive device

[0002] The invention relates to a bevel gear differential for an electric drive device of a motor vehicle and to an electric drive device.

[0003] It is known to manufacture a bevel gear differential, or rather its housing cage, using a casting process. However, this manufacturing process becomes cost-intensive beyond a certain degree of complexity of the housing cage.

[0004] Therefore, it is an object of the present invention to provide a bevel gear differential for an electric drive device of a motor vehicle and an electric drive device which can be produced cost-effectively.

[0005] This problem is solved by the features of the independent patent claim. Further advantageous developments are the subject of the dependent claims.

[0006] A first aspect of the present invention comprises a bevel gear differential for an electric drive device of a motor vehicle.

[0007] The bevel gear differential comprises a housing cage configured to rotate about an axial direction to transmit input torque to at least one bevel gear assembly. The housing cage may be manufactured using a casting process.

[0008] The housing cage has at least one receptacle for arranging a bevel gear device on the housing cage. The at least one receptacle comprises an opening in the axial direction into which a bevel gear device can be inserted perpendicular to its axis of rotation or perpendicular to the axis of rotation of the bevel gear device and, for example, in and / or counter to the axial direction. This makes the housing cage easier to manufacture or cast, thus reducing manufacturing costs compared to the prior art.

[0009] The at least one receptacle can be designed such that the torque is transmitted to at least one bevel gear device via it or via the housing cage. Thus, the at least one receptacle can have a depth that corresponds to the diameter of an axle section of at least one bevel gear device.

[0010] Furthermore, the opening of the at least one receptacle can be closed with a cover, so that a bevel gear device is fixed perpendicular to its axis of rotation and, for example, in and / or counter to the axial direction of the housing cage and the cover. The cover can be manufactured using a deep-drawing process. This also allows for easier production of the cover, and the deep-drawing process can reduce manufacturing costs compared to a cast cover.

[0011] In addition, the cover can extend along the axial direction.

[0012] Furthermore, the lid may have a first hollow cylindrical portion and a second hollow cylindrical portion.

[0013] The first and second hollow cylindrical sections can be arranged successively in the axial direction.

[0014] In addition, the first hollow cylindrical section may have a larger diameter than the second hollow cylindrical section.

[0015] Furthermore, the cover can have a flange with which the cover can be fastened, e.g., screwed, to the housing basket. The flange can be arranged on the first hollow cylindrical section.

[0016] Furthermore, the flange can be designed similarly to a circular disk with fastening tongues projecting in the radial direction, with the aid of which the flange or the cover can be fastened, e.g. screwed, to the housing basket.

[0017] At least one surface of the flange that is oriented perpendicular to the axial direction may be remachined to ensure a secure fit of a screw head on the flange and / or a secure fit of the cover on the housing basket.

[0018] The flange, together with the first hollow cylindrical section, can also form a first centering device, or the cover can have a first centering device with which the cover can be centered on the housing basket. The centering device assists in correctly aligning the cover on the housing basket. The first centering device can be designed as a receptacle in which, for example, a second centering device of the housing basket can be arranged.

[0019] The housing basket may have a second centering device, which may be designed as a projection, so that it can be received in a first centering device of the cover. The centering device assists in the correct alignment of the cover to the housing basket.

[0020] Furthermore, the flange can have three mounting tabs that are equally spaced from each other in the circumferential direction. The cover can be screwed to the housing cage, for example, with two screws per mounting tab.

[0021] In addition, the first hollow cylindrical section can be connected to the flange in the axial direction.

[0022] In addition, the inner circumferential surface of the first hollow cylindrical section can be at least partially reworked in order to enable trouble-free rotation of a bevel gear toothing of a first hub of the bevel gear differential, which can be arranged in the interior of the first hollow cylindrical section.

[0023] Furthermore, the inner circumferential surface of the second hollow cylindrical section can be at least partially reworked in order to enable trouble-free rotation of a first hub of the bevel gear differential, which can be arranged in the interior of the second hollow cylindrical section.

[0024] The outer surface of the second hollow cylindrical section can be remachined to form a contact surface for a seal and / or a rolling bearing.

[0025] Furthermore, the first hollow cylindrical section can transition smoothly into the second hollow cylindrical section.

[0026] The cover may have a transition section in the transition between the first hollow cylindrical section and the second hollow cylindrical section, which is designed similarly to an annular disc.

[0027] The outward-facing surface of the transition section can be at least partially remachined to form a contact surface for a seal and / or a rolling bearing. The inward-facing surface of the transition section can be at least partially remachined to form a contact surface for a thrust washer for supporting forces from at least one bevel gear device of the bevel gear differential.

[0028] In the present description, an “outwardly directed surface” can be understood to mean a surface that forms part of the outer peripheral surface or the lateral surface of the cover.

[0029] In the present description, an “inwardly directed surface” can be understood to mean a surface that forms part of the inner peripheral surface or the inner lateral surface of the cover.

[0030] Furthermore, the bevel gear differential may have a first and a second hub, each for connection to a vehicle wheel. The first and second hubs may be coaxially aligned.

[0031] Furthermore, the bevel gear differential may comprise at least one bevel gear device as a differential bevel gear between the first and second hub.

[0032] The first and second hubs can be designed on the inside for a positive connection with a shaft and on the outside for a bevel gear toothing for meshing with the at least one bevel gear device.

[0033] In addition, the at least one bevel gear device can have a toothing section with a bevel gear toothing for meshing with another bevel gear toothing and an axle section for arrangement in the at least one receptacle.

[0034] The axle section of the at least one bevel gear device can be arranged in the at least one receptacle.

[0035] The axle section and the gear section can also be formed as a single piece. In this case, the at least one receptacle and the cover are designed such that they allow or permit relative rotation of the at least one bevel gear device to the housing cage and cover.

[0036] However, it is also possible for the axle section and the toothed section to be formed as a single part. In this case, the at least one receptacle and the cover are designed such that the toothed section is rotatable relative to the axle section. In this case, the axle section of the at least one bevel gear device can be clamped by the housing cage and cover such that the axle section is not rotatable relative to the housing cage and / or cover.

[0037] Furthermore, the at least one bevel gear device and / or its toothed section as well as the first and second hub can be arranged on the housing basket in such a way that they are in engagement with one another or mesh with one another.

[0038] It is also possible for at least one planetary gear to be arranged on the housing basket, which may be of stepped design.

[0039] Furthermore, the second hub can be arranged inside the housing basket.

[0040] A second aspect of the present invention comprises an electric drive device for a motor vehicle.

[0041] It is expressly pointed out that the features of the bevel gear differential, as mentioned under the first aspect, can be used individually or in combination with one another in the drive device.

[0042] In other words, the features relating to the bevel gear differential mentioned above under the first aspect of the invention can also be combined with further features here under the second aspect of the invention.

[0043] An electric drive device for a motor vehicle comprises a bevel gear differential according to the first aspect and an electric machine.

[0044] The electric machine can, for example, be operatively connected to the bevel gear differential via additional transmission components so that a movement of at least one vehicle wheel and / or for a motor vehicle can be generated.

[0045] The invention is explained in more detail below using an exemplary embodiment in conjunction with the accompanying drawings. The drawings schematically show:

[0046] Fig. 1 is a first spatial view of a bevel gear differential for an electric drive device of a motor vehicle;

[0047] Fig. 2 shows a second spatial view of the bevel gear differential from Fig. 1 with a cover; Fig. 3 shows a first spatial view of a cover of the bevel gear differential; and

[0048] Fig. 4 a second spatial view of the cover from Figure 3

[0049] In the following description, the same reference symbols are used for the same items.

[0050] Figure 1 shows a first spatial view of a bevel gear differential 1 for an electric drive device of a motor vehicle, wherein Figure 2 shows a second spatial view of the bevel gear differential 1 from Figure 1 with a cover 6.

[0051] Furthermore, Figure 3 shows a first spatial view of a cover 6 of the bevel gear differential 1 and Figure 4 shows a second spatial view of the cover 6 from Figure 3.

[0052] For the sake of simplicity and brevity, Figures 1 to 4 are described together below.

[0053] In more detail, Figure 1 shows, for example, a bevel gear differential 1 for an electric drive device of a motor vehicle with a housing basket 2 which is designed to be rotatable about an axial direction A in order to transmit an input torque to bevel gear devices 3.

[0054] The housing basket 2 has three receptacles 4 each for arranging a bevel gear device 3 on the housing basket 2.

[0055] Each receptacle 4 has an opening 5 in the axial direction A, into which a bevel gear device 3 is inserted perpendicular to the axis of rotation of the bevel gear device 3.

[0056] The opening 5 of each receptacle 4 can be closed with a cover 6, so that three bevel gear assemblies 3 are fixed perpendicular to their axis of rotation or in and against the axial direction A by the housing basket 2 and the cover 6 - see Figure 2. In other words, the cover serves to secure the position of each bevel gear assembly 3 in the axial direction A, so that a bevel gear assembly 3 cannot be removed from the housing basket 2. The cover 6 was manufactured using a deep-drawing process, which allows the housing basket 2 and the cover 6 to be manufactured cost-effectively. The housing basket 2 was manufactured using a casting process.

[0057] According to Figures 2 to 4, the cover 6 extends along the axial direction A, wherein the cover 6 has a first hollow cylindrical section 7 and a second hollow cylindrical section 8.

[0058] As shown in the figures, the first and second hollow cylindrical sections 7, 8 are arranged successively in the axial direction A, wherein the first hollow cylindrical section 7 has a larger diameter than the second hollow cylindrical section 8.

[0059] According to Figures 2 to 4, the cover 6 has a flange 10 with which the cover 6 can be screwed or is screwed to the housing basket 2.

[0060] The flange 10 is arranged on the first hollow cylindrical section 7. Furthermore, the flange 10 is designed similarly to a circular disk with fastening tabs 11 projecting in the radial direction R, with the aid of which the flange 10 or the cover 6 can be screwed or is screwed to the housing basket 2.

[0061] The surfaces 10A, 10B of the flange 10, which are aligned perpendicular to the axial direction A, are remachined to ensure a secure fit of a screw head on the flange 10 and a secure fit of the cover 6 on the housing basket 2.

[0062] Furthermore, Figure 3 shows that the flange 10 together with the first hollow cylindrical section 7 forms a first centering device 12 with which the cover 6 can be centered on the housing basket 2.

[0063] The first centering device 12 is designed as a receptacle in which a second centering device 13 of the housing basket 2 can be arranged.

[0064] According to Figure 1, the housing basket 2 has a second centering device 13 which is designed as a projection so that it can be received in the first centering device 12 of the cover 6.

[0065] Furthermore, Figures 2 to 4 show that the flange 10 has three fastening tabs 11, which are equally spaced from one another in the circumferential direction U. The cover 6 can be screwed to each fastening tab 11 with two screws. Furthermore, the first hollow cylindrical section 7 adjoins the flange 10 in the axial direction A.

[0066] Furthermore, the inner circumferential surface of the first hollow cylindrical section 7 is at least partially reworked in order to enable trouble-free rotation of a bevel gear toothing of a first hub 14 of the bevel gear differential 1, arranged in the interior of the first hollow cylindrical section 7 - see Figure 2.

[0067] Furthermore, the inner surface of the second hollow cylindrical section 8 is at least partially reworked to enable trouble-free rotation of a first hub 14 of the bevel gear differential 1, arranged in the interior of the first hollow cylindrical section 7 - see Figure 2.

[0068] The outer surface of the second hollow cylindrical section 8 is also remachined to form a contact surface for a rolling bearing.

[0069] According to Figures 3 and 4, the first hollow cylindrical section 7 transitions smoothly into the second hollow cylindrical section 8. In the transition between the first hollow cylindrical section 7 and the second hollow cylindrical section 8, the cover 6 has a transition section 9 which is shaped similarly to an annular disk.

[0070] The outwardly directed surface 9A of the transition section 9 is at least partially remachined to form a bearing surface for a rolling bearing.

[0071] The inwardly directed surface 9B of the transition section 9 is at least partially remachined to form a contact surface for a thrust washer to support forces of the bevel gear devices 3.

[0072] As shown in Figure 1, the bevel gear differential 1 further comprises a first hub 14 and a second hub, each for connection to a vehicle wheel. The second hub is located inside the housing cage 2 and is therefore not visible.

[0073] Furthermore, the first 14 and second hub are coaxially aligned.

[0074] In addition, the bevel gear differential 1 has three bevel gear devices 3 as differential bevel gears between the first hub 14 and the second hub. The first hub 14 and the second hub are designed on the inside for a positive connection to a shaft and on the outside for a bevel gear toothing for meshing with the bevel gear devices 3.

[0075] Each bevel gear device 3 has a toothing section with a bevel gear toothing for meshing with another bevel gear toothing and an axle section for arrangement in a receptacle 4. The axle section of each bevel gear device 3 is arranged in a receptacle 4.

[0076] The bevel gear devices 3 as well as the first 14 and second hub are arranged on the housing basket 2 in such a way that they are in engagement with one another or mesh with one another.

[0077] Finally, Figure 1 shows that three planetary gears are arranged on the housing basket 2, which are designed in stages.

[0078] List of reference symbols

[0079] 1 bevel gear differential

[0080] 2 housing basket

[0081] 3 Bevel gear device

[0082] 4 Recording

[0083] 5 Opening

[0084] 6 lids

[0085] 7 first hollow cylindrical section

[0086] 8 second hollow cylindrical section

[0087] 9 Transition section

[0088] 9A outward-facing surface of the transition section

[0089] 9B inward-facing surface of the transition section

[0090] 10 Flange

[0091] 10A Flange area

[0092] 10B Surface of the flange

[0093] 11 Fastening tongue

[0094] 12 first centering device

[0095] 13 second centering device

[0096] 14 first hub

[0097] A axial direction

[0098] R radial direction

[0099] U circumferential direction

Claims

Patent claims 1 . Bevel gear differential (1 ) for an electric drive device of a motor vehicle, comprising: - a housing basket (2) which is rotatable about an axial direction (A) in order to transmit an input torque to at least one bevel gear device (3), - wherein the housing basket (2) has at least one receptacle (4) for arranging a bevel gear device (3) on the housing basket (2), characterized in that - the at least one receptacle (4) has an opening (5) in the axial direction (A) into which a bevel gear device (3) can be introduced perpendicular to the axis of rotation of the bevel gear device (3).

2. Bevel gear differential according to claim 1, - wherein the opening (5) of the at least one receptacle (4) can be closed with a cover (6), so that a bevel gear device (3) is fixed perpendicular to its axis of rotation by the housing basket (2) and the cover (6), and / or - wherein the lid (6) has been produced by a deep-drawing process.

3. Bevel gear differential according to claim 1 or 2, - wherein the cover (6) has a first hollow cylindrical section (7) and a second hollow cylindrical section (8), - wherein the first and second hollow cylindrical sections (7, 8) are arranged successively in the axial direction (A), and - wherein the first hollow cylindrical section (7) has a larger diameter than the second hollow cylindrical section (8).

4. Bevel gear differential according to one of the preceding claims in combination with claim 2, - wherein the cover (6) has a flange (10) with which the cover (6) can be fastened to the housing basket (2), - wherein the flange (10) is designed similarly to a circular disc with fastening tongues (11) projecting in the radial direction (R), with the aid of which the flange (10) or the cover (6) can be fastened to the housing basket (2), and - wherein at least one surface (10A, 10B) of the flange (10) which is oriented perpendicular to the axial direction (A) is reworked in order to ensure a secure fit of a screw head on the flange (10) and / or a secure fit of the cover (6) on the housing basket (2).

5. Bevel gear differential according to claim 4, - wherein the cover (6) has a first centering device (12) with which the cover (6) can be centered on the housing basket (2), - wherein the first centering device (12) is designed as a receptacle in which a second centering device (13) of the housing basket (2) can be arranged, and - wherein the housing basket (2) has a second centering device (13) which is designed as a projection so that it can be received in a first centering device (12) of the cover (6).

6. Bevel gear differential according to one of the preceding claims, - wherein the cover (6) has a first hollow cylindrical section (7) and a second hollow cylindrical section (8), and - wherein the inner circumferential surface of the first hollow cylindrical section (7) is at least partially reworked in order to enable trouble-free rotation of a bevel gear toothing of a first hub (14) of the bevel gear differential (1), which can be arranged in the interior of the first hollow cylindrical section (7).

7. Bevel gear differential according to one of the preceding claims, - wherein the cover (6) has a first hollow cylindrical section (7) and a second hollow cylindrical section (8), - wherein the inner circumferential surface of the second hollow cylindrical section (8) is at least partially reworked to enable trouble-free rotation of a first hub (14) of the bevel gear differential (1), which can be arranged in the interior of the second hollow cylindrical section (8), and - wherein the outer surface of the second hollow cylindrical section (8) is reworked to form a bearing surface for a rolling bearing.

8. Bevel gear differential according to one of the preceding claims, - wherein the cover (6) has a first hollow cylindrical section (7) and a second hollow cylindrical section (8), - wherein the first hollow cylindrical section (7) merges smoothly into the second hollow cylindrical section (8), - wherein the cover (6) has a transition section (9) in the transition between the first hollow cylindrical section (7) and the second hollow cylindrical section (8), which is designed similarly to an annular disc, - wherein the outwardly directed surface (9A) of the transition section (9) is at least partially reworked to form a bearing surface for a rolling bearing, and - wherein the inwardly directed surface (9B) of the transition section (9) is at least partially reworked in order to form a contact surface for a thrust washer for supporting forces of at least one bevel gear device (3) of the bevel gear differential (1).

9. Bevel gear differential according to one of the preceding claims, further comprising: - a first (14) and a second hub each for connection to a vehicle wheel, and - at least one bevel gear device (3) as a differential bevel gear between the first (14) and second hub, - wherein the at least one bevel gear device (3) has a toothing section with a bevel gear toothing for meshing with another bevel gear toothing and an axle section for arrangement in the at least one receptacle (4), - wherein the axle section of the at least one bevel gear device (3) is arranged in the at least one receptacle (4), and - wherein the at least one bevel gear device (3) and the first (14) and second hub are arranged on the housing basket (2) in such a way that they mesh with one another.

10. Electric drive device for a motor vehicle comprising: - a bevel gear differential according to one of the preceding claims, and - an electric machine, - whereby the electric machine is operatively connected to the bevel gear differential.

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