Bevel gear differential for an electric drive of a motor vehicle and electric drive

Abstract

The invention relates to a bevel differential (1) for an electric drive of a motor vehicle, comprising: • a housing cage (2), which is rotatable about an axial direction (A) for transmitting an input torque to at least one bevel gear (3), • wherein the housing cage (2) has at least one receptacle (4) for arranging the bevel gear (3) on the housing cage (2), • wherein the at least one receptacle (4) has an opening (5) in the axial direction (A), into which the bevel gear (3) can be inserted perpendicularly to its axis of rotation. Furthermore, the invention relates to an electric drive for a motor vehicle with a bevel differential.

Description

[0001] This invention relates to a bevel gear differential for an electric drive system of a motor vehicle and an electric drive system.

[0002] It is known that bevel gear differentials and their housings can be manufactured using casting processes. However, once the housing reaches a certain level of complexity, manufacturing becomes costly.

[0003] Therefore, the object of the present invention is to provide a bevel gear differential for an electric drive system of a motor vehicle and an electric drive system that can be manufactured at a lower cost.

[0004] This task is solved by the features of the independent patent claims. Other advantageous improvements constitute the subject matter of the dependent claims.

[0005] A first aspect of the invention includes a bevel gear differential for an electric drive system for motor vehicles.

[0006] A bevel gear differential includes a housing cage configured to rotate about an axial direction to transmit input torque to at least one bevel gear assembly. The housing cage can be manufactured using a casting process.

[0007] The housing cage has at least one socket for arranging a bevel gear assembly on the housing cage. The at least one socket has an axial opening into which the bevel gear assembly can be inserted, perpendicular to its axis of rotation (i.e., perpendicular to the axis of rotation of the bevel gear assembly), for example, along and / or against the axial direction. In this way, the housing cage is easier to manufacture or cast, thereby reducing manufacturing costs compared to existing technologies.

[0008] Here, the at least one socket can be configured to transmit torque to at least one bevel gear device via the socket or via the housing cage. Therefore, the at least one socket can have a depth corresponding to the diameter of the shaft segment of the at least one bevel gear device.

[0009] Furthermore, the opening of the at least one socket can be closed by a cover, thereby securing the bevel gear assembly perpendicular to its axis of rotation and, for example, along and / or against the axial direction by the housing and the cover. The cover can be manufactured using a deep-drawing process. Thus, the cover can also be manufactured more easily, and manufacturing costs can be reduced by using a deep-drawing process compared to casting a cover.

[0010] In addition, the cover can extend axially.

[0011] In addition, the cover may have a first hollow cylindrical section and a second hollow cylindrical section.

[0012] The first and second hollow cylindrical sections can be arranged sequentially in the axial direction.

[0013] In addition, the first hollow cylindrical segment can have a larger diameter than the second hollow cylindrical segment.

[0014] In addition, the cover may have a flange by means of which the cover can be secured to the housing cage (e.g., by screw connection). The flange may be located on the first hollow cylindrical section.

[0015] In addition, the flange may resemble an annular disc and have a radially projecting fixing tongue, which allows the flange or cover to be secured to the housing cage (e.g., by screw connection).

[0016] At least one surface of the flange perpendicular to the axial direction may be post-machined to ensure a reliable fit of the screw head on the flange and / or a reliable fit of the cap on the housing cage.

[0017] The flange may also form a first positioning device together with the first hollow cylindrical section, or the cover may have a first positioning device by means of which the cover can be centered on the shell cage. This positioning device helps to ensure proper alignment of the cover on the shell cage.

[0018] The first positioning device can be configured as a socket, for example, in which a second positioning device for the housing cage can be arranged.

[0019] The shell cage may have a second positioning device, which may be configured as a protrusion so that it can be received by the first positioning device of the cover. This positioning device helps to ensure proper alignment of the cover on the shell cage.

[0020] Furthermore, the flange may have three retaining tongues, which are equidistant from each other in the circumferential direction. Here, the cover may be screwed onto each retaining tongue by two screws (e.g., on the housing cage).

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

[0022] Furthermore, the inner cylindrical surface of the first hollow cylindrical section can be at least partially post-machined to enable the bevel gear meshing portion of the first hub of the bevel gear differential to rotate without interference inside the first hollow cylindrical section.

[0023] In addition, the inner cylindrical surface of the second hollow cylindrical section can be at least partially post-machined to enable the first hub of the bevel gear differential to rotate without interference inside the second hollow cylindrical section.

[0024] The outer cylindrical surface of the second hollow cylindrical section can be post-processed to form a contact surface for seals and / or rolling bearings.

[0025] In addition, the first hollow cylindrical segment can smoothly transition to the second hollow cylindrical segment.

[0026] The cover may have a transition section at the transition between the first hollow cylindrical section and the second hollow cylindrical section, which is similar to the structure of an annular disk.

[0027] The outer surface of the transition section may be at least partially post-processed to form a contact surface for seals and / or rolling bearings.

[0028] The inner surface of the transition section may be at least partially post-machined to form the contact surface of a thrust washer for supporting at least one bevel gear assembly of the bevel gear differential.

[0029] In this specification, "outer surface" can be understood as the surface that forms part of the outer circumferential surface or cylindrical surface of the cover.

[0030] In this specification, "inner surface" can be understood as the surface that forms part of the inner circumferential surface or inner cylindrical surface of the cover.

[0031] Furthermore, the bevel gear differential may have first and second hubs for connection with the wheels. Here, the first and second hubs may be coaxially aligned.

[0032] Additionally, a bevel gear differential may include at least one bevel gear assembly serving as a compensating bevel gear between the first and second hubs.

[0033] The first and second hubs may be configured on the inner side for form-locking connection with the shaft, and on the outer side for bevel gear meshing portion for meshing with at least one bevel gear device.

[0034] Furthermore, the at least one bevel gear device may have a meshing section with a bevel gear meshing portion for meshing with another bevel gear meshing portion, and a shaft section for being arranged in the at least one socket.

[0035] The shaft segment of the at least one bevel gear device can be arranged in the at least one socket.

[0036] The shaft segment and the meshing segment can also be integrally formed. In this case, the at least one socket and cover are configured to allow or permit relative rotation of at least one bevel gear assembly relative to the housing cage and cover.

[0037] However, the shaft segment and the meshing segment can also be configured as a single component. In this case, the at least one socket and cover are configured to allow the meshing segment to rotate relative to the shaft segment. In this case, the shaft segment of the at least one bevel gear assembly can be clamped by the housing cage and cover in such a way that the shaft segment cannot rotate relative to the housing cage and / or cover.

[0038] Furthermore, the at least one bevel gear assembly and / or its meshing section, as well as the first and second hubs, can be arranged on the housing cage such that they mesh or interlock with each other.

[0039] Alternatively, at least one planetary gear can be arranged on the housing cage, which can be configured in a stepped shape.

[0040] In addition, the second hub can be arranged inside the housing cage.

[0041] A second aspect of the invention includes an electric drive device for a motor vehicle.

[0042] It is explicitly stated that the features of the bevel gear differential described in the first aspect can be applied individually or in combination in the drive unit.

[0043] In other words, the features described above regarding the first aspect of the invention relating to a bevel gear differential can also be combined with other features in the second aspect of the invention.

[0044] An electric drive device for a motor vehicle includes a bevel gear differential according to the first aspect and an electric motor.

[0045] For example, the motor can be powered by a bevel gear differential via further transmission components, thereby enabling motion to at least one wheel and / or to the motor vehicle. Attached Figure Description

[0046] The present invention will now be described in more detail with reference to the embodiments shown in the accompanying drawings. The drawings schematically illustrate: Figure 1 A first perspective view of a bevel gear differential for an electric drive system of a motor vehicle; Figure 2 From Figure 1 A second perspective view of a bevel gear differential with a cover; Figure 3 First perspective view of a cover of a bevel gear differential; and Figure 4 From Figure 3 Second perspective view of the cover Detailed Implementation

[0047] In the following description, the same reference numerals are used for the same objects.

[0048] Figure 1 A first perspective view of a bevel gear differential 1 for an electric drive system of a motor vehicle is shown, while... Figure 2 The text shows information from... Figure 1 A second perspective view of the bevel gear differential 1 with a cover 6.

[0049] also, Figure 3 A first perspective view of a cover 6 of the bevel gear differential 1 is shown, while Figure 4 Shown from Figure 3The second perspective view of the cover 6.

[0050] For the sake of simplicity and brevity, the following will be Figures 1 to 4 Describe them together.

[0051] More specifically, for example Figure 1 A bevel gear differential 1 for an electric drive system of a motor vehicle is shown, which has a housing 2 configured to rotate about an axis A to transmit input torque to a bevel gear assembly 3.

[0052] The housing cage 2 has three sockets 4, each for arranging a bevel gear device 3 on the housing cage 2.

[0053] Each socket 4 has an opening 5 in the axial direction A, into which one of the bevel gear devices 3 is inserted perpendicular to the rotation axis of the bevel gear device 3.

[0054] The opening 5 of each socket 4 can be closed by the cover 6, so that the three bevel gear assemblies 3 are fixed by the housing cage 2 and the cover 6 perpendicular to their axis of rotation and in the opposite direction to the axial direction A—see Figure 2 In other words, the cover is used to fix 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 cage 2.

[0055] The cover 6 is manufactured using a deep drawing process, which allows both the shell cage 2 and the cover 6 to be manufactured at a lower cost. The shell cage 2 is manufactured using a casting process.

[0056] according to Figures 2 to 4 The cover 6 extends along the axial direction A, wherein the cover 6 has a first hollow cylindrical segment 7 and a second hollow cylindrical segment 8.

[0057] As shown in the attached figure, the first and second hollow cylindrical segments 7 and 8 are arranged sequentially along the axial direction A, wherein the first hollow cylindrical segment 7 has a larger diameter than the second hollow cylindrical segment 8.

[0058] according to Figures 2 to 4 The cover 6 has a flange 10 by means of which the cover 6 can be screwed onto the housing cage 2 or has already been screwed on.

[0059] Here, flange 10 is provided on the first hollow cylindrical section 7. In addition, flange 10 is similar to an annular disc and has a fixing tongue 11 protruding radially R, by means of which flange 10 or cover 6 can be screwed onto the housing cage 2 or has already been screwed on.

[0060] The surfaces 10A and 10B of the flange 10, which is perpendicular to the axial direction A, are post-processed to ensure a reliable fit of the screw head on the flange 10 and a reliable fit of the cover 6 on the housing cage 2.

[0061] also, Figure 3This indicates that the flange 10 together with the first hollow cylindrical section 7 forms a first positioning device 12, by means of which the cover 6 can be centered on the housing cage 2.

[0062] Here, the first positioning device 12 is configured as a socket, in which the second positioning device 13 of the housing cage 2 can be arranged.

[0063] according to Figure 1 The housing cage 2 has a second positioning device 13, which is formed as a protrusion so that it can be received by the first positioning device 12 of the cover 6.

[0064] In addition, from Figures 2 to 4 It is known that the flange 10 has three fixing tongues 11, which are equidistant from each other in the circumferential direction U. Here, the cover 6 can be screwed to each fixing tongue 11 by two screws. In addition, in the axial direction A, the first hollow cylindrical section 7 is tightly connected to the flange 10.

[0065] Furthermore, the inner cylindrical surface of the first hollow cylindrical section 7 is at least partially post-machined to ensure uninterrupted rotation of the bevel gear meshing portion of the first hub 14 of the bevel gear differential 1 arranged inside the first hollow cylindrical section 7—see [link to relevant documentation]. Figure 2 .

[0066] In addition, the inner cylindrical surface of the second hollow cylindrical section 8 is at least partially post-machined to ensure uninterrupted rotation of the first hub 14 of the bevel gear differential 1 arranged inside the first hollow cylindrical section 7—see [link to documentation]. Figure 2 .

[0067] Similarly, the outer cylindrical surface of the second hollow cylindrical segment 8 is post-machined to form a contact surface for rolling bearings.

[0068] according to Figure 3 and Figure 4 The first hollow cylindrical segment 7 smoothly transitions to the second hollow cylindrical segment 8. Here, the cover 6 has a transition segment 9 at the transition between the first hollow cylindrical segment 7 and the second hollow cylindrical segment 8, which is similar to an annular disk.

[0069] The outer surface 9A of the transition section 9 is at least partially post-machined to form a contact surface for rolling bearings.

[0070] The inner surface 9B of the transition section 9 is at least partially post-processed to form a contact surface for the thrust washer that supports the forces on the bevel gear assembly 3.

[0071] like Figure 1 As shown, the bevel gear differential 1 also has a first hub 14 and a second hub for connection with the wheel. The second hub is located inside the housing cage 2 and is therefore not visible.

[0072] Furthermore, the first 14 and the second wheel hub are coaxially aligned.

[0073] In addition, the bevel gear differential 1 has three bevel gear units 3 that serve as compensating bevel gears between the first 14 and the second hub.

[0074] Here, the first 14 and the second hub are configured on the inner side for form-locking connection with the shaft, and on the outer side for bevel gear meshing portion for meshing with the bevel gear device 3.

[0075] Each bevel gear assembly 3 has a meshing section with a bevel gear meshing section for meshing with another bevel gear meshing section, and a shaft section for arrangement in a socket 4. Here, the shaft section of each bevel gear assembly 3 is arranged in a socket 4.

[0076] The bevel gear assembly 3, along with the first 14 and the second hub, are arranged on the housing cage 2 such that they mesh or interlock with each other.

[0077] at last, Figure 1 As shown, three stepped planetary gears are arranged on the housing cage 2.

[0078] Explanation of reference numerals in the attached figures 1. Bevel gear differential 2. Shell cage 3. Bevel gear assembly 4 sockets 5 Openings 6 lids 7 First hollow cylindrical segment 8 Second hollow cylindrical segment 9. Transition Section 9A Transition Section Outer Surface 9B Transition section inner surface 10 Flange 10A flange surface 10B flange surface 11. Fixed tongue plate 12 First positioning device 13 Second positioning device 14 First wheel hub Axial R radial U circumferential direction

Claims

1. A bevel gear differential (1) for an electric drive system of a motor vehicle, characterized in that: • Includes a housing cage (2) that is rotatable about an axis (A) to transmit input torque to at least one bevel gear device (3). • The housing cage (2) has at least one socket (4) for arranging a bevel gear device (3) on the housing cage (2). Its features • At least one socket (4) has an opening (5) in the axial direction (A) into which the bevel gear device (3) can be inserted perpendicularly to its axis of rotation.

2. The bevel gear differential according to claim 1, • in, At least one socket (4) opening (5) can be closed by a cover (6), thereby fixing the bevel gear device (3) perpendicular to its axis of rotation by means of the housing cage (2) and the cover (6). and / or • Among them, the cover (6) is manufactured by deep drawing process.

3. The bevel gear differential according to claim 1 or 2, • The cover (6) has a first hollow cylindrical section (7) and a second hollow cylindrical section (8). • in, The first and second hollow cylindrical segments (7, 8) are arranged sequentially along the axial direction (A), and • in, The diameter of the first hollow cylindrical segment (7) is larger than that of the second hollow cylindrical segment (8).

4. The bevel gear differential according to any one of the preceding claims and in conjunction with claim 2, • The cover (6) has a flange (10) through which the cover (6) can be fixed to the shell cage (2). • in, The flange (10) is similar to an annular disc and has fixing tongues (11) protruding radially (R) to secure the flange (10) or cover (6) to the housing cage (2). • At least one surface (10A, 10B) of the flange (10) is arranged perpendicular to the axial direction (A) and is machined to ensure a reliable fit of the screw head on the flange (10) and / or a reliable fit of the cover (6) on the housing cage (2).

5. The bevel gear differential according to claim 4, • The cover (6) has a first positioning device (12), which allows the cover (6) to be centered on the housing cage (2). • in, The first positioning device (12) is provided as a socket, in which the second positioning device (13) of the housing cage (2) can be arranged, and • The shell cage (2) has a second positioning device (13) which is provided as a protrusion so that it can be accommodated by the first positioning device (12) of the cover (6).

6. The bevel gear differential according to any one of the preceding claims, • Wherein, the cover (6) has a first hollow cylindrical segment (7) and a second hollow cylindrical segment (8), and • in, The inner cylindrical surface of the first hollow cylindrical section (7) is at least partially machined to allow the bevel gear meshing portion on the first hub (14) of the bevel gear differential (1) to rotate without interference inside the first hollow cylindrical section (7).

7. The bevel gear differential according to any one of the preceding claims, • in, The cover (6) has a first hollow cylindrical section (7) and a second hollow cylindrical section (8). • In this process, at least part of the inner cylindrical surface of the second hollow cylindrical section (8) is machined to ensure that the first hub (14) of the bevel gear differential (1) rotates without interference inside the second hollow cylindrical section (8), and • The outer cylindrical surface of the second hollow cylindrical segment (8) is machined to form the contact surface of the rolling bearing.

8. The bevel gear differential according to any one of the preceding claims, • in, The cover (6) has a first hollow cylindrical section (7) and a second hollow cylindrical section (8). • The first hollow cylindrical segment (7) and the second hollow cylindrical segment (8) transition smoothly. • Wherein, the cover (6) has a transition section (9) at the transition between the first hollow cylindrical section (7) and the second hollow cylindrical section (8), the transition section (9) being similar to an annular disk, • Wherein, the outer surface (9A) of the transition section (9) is at least partially machined to form the contact surface of the rolling bearing, and • The inner surface (9B) of the transition section (9) is at least partially machined to form a contact surface for a thrust washer that supports the force on at least one bevel gear assembly (3).

9. The bevel gear differential according to any one of the preceding claims, further comprising: • The first hub (14) and the second hub are each used to connect to the wheel, and • At least one bevel gear assembly (3) serves as a compensating bevel gear between the first hub (14) and the second hub. • At least one bevel gear assembly (3) has a meshing section with bevel gear meshing parts for meshing with another bevel gear meshing part, and a shaft section for being arranged in at least one socket (4). • Wherein, the shaft segment of at least one bevel gear device (3) is arranged in at least one socket (4), and • In this configuration, at least one bevel gear assembly (3) and a first hub (14) and a second hub are arranged on the housing cage (2) so that they mesh with each other.

10. An electric drive device for a motor vehicle, comprising: • A bevel gear differential according to any one of the preceding claims, and • One motor, • The motor is connected to the bevel gear differential for power transmission.

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