Differential and drive arrangement with such a differential

Abstract

The invention relates to a differential (10) for a drive arrangement comprising two side gears (12), each of which is arranged in a rotationally fixed manner on an output shaft (14), wherein the output shafts (14) are oriented along a rotational axis (16), a differential pin (18) with two differential gears (20), wherein the differential gears (20) are rotatably arranged on the differential pin (18), wherein the differential gears (20) mesh with the side gears (12), a differential housing (22), wherein the side gears (12) and the differential pin (18) with the differential gears (20) are arranged within the differential housing (22), wherein the differential pin (18) is coupled in a rotationally fixed manner to the differential housing (22), a venting device (24) for venting and / or relieving pressure from the differential (10), wherein the venting device (24) is arranged in or on Differential housing (22) is arranged.The invention also relates to a drive arrangement with at least one such differential (10).

Description

[0001] The invention relates to a differential for a drive arrangement having the features of claim 1, as well as a drive arrangement for a vehicle, in particular for a motor vehicle, having the features of the independent claim. State of the art

[0002] Lubricant, especially oil, can be used to lubricate and / or cool a differential. Open differentials or differentials with windows in the differential housing can be used to vent or relieve pressure in the differential. This often requires an additional lubricant chamber.

[0003] DE 10 2018 125 460 A1 discloses a coaxial transmission arrangement for a vehicle with a ventilation device.

[0004] The disadvantage is that additional splash losses can occur due to shaft rotation during operation, particularly in the additional lubricant chamber. Especially in coaxial arrangements, the technical implementation of the additional lubricant chamber and the corresponding venting or pressure relief is challenging, especially if no lubricant, oil, and / or moisture are allowed in the shared volume with the electric motor. Disclosure of the invention

[0005] According to the invention, a differential for a drive arrangement is proposed, comprising two side gears, each of which is arranged in a rotationally fixed manner on an output shaft. The differential thus comprises two output shafts. The output shafts are oriented along a rotational axis. The output shafts are designed to be rotatable about the rotational axis. The differential comprises a differential pin with two differential gears. The differential gears are arranged rotatably or non-rotatably (the opposite of rotationally fixed) on the differential pin. The differential gears mesh with the side gears. The differential comprises a differential housing. The side gears and the differential pin with the differential gears are arranged within the differential housing. The differential housing can be arranged centrally. The differential pin is coupled in a rotationally fixed manner to the differential housing. The differential comprises a venting device for venting and / or relieving pressure from the differential.The venting device is located in the differential housing.

[0006] This allows for direct and efficient venting or pressure relief of the differential using simple means. The risk of radial shaft seal failure can be reduced by pressure relief using the venting device. An open or windowed differential housing can be dispensed with. A closed (and therefore more efficient) differential housing can be used. Splash losses can be avoided or at least reduced (compared to open and / or windowed differential housings). Furthermore, a smaller lubricant or oil volume is required, improving lubricating properties.

[0007] According to a further development of the differential, the venting device can comprise a vent screw with an integrated check valve. The vent screw can be designed to be screwed into a screw opening in the differential housing. The venting device can comprise a sealing washer that can be placed around the vent screw. The sealing washer can be designed as a sealing washer.

[0008] This allows the ventilation system to be implemented using simple means.

[0009] According to a further development of the differential, a deflection device can be arranged within the differential housing and in the area of ​​the venting device. The deflection device can comprise at least one element, e.g., made of sheet metal, for deflecting, shielding, or protecting the venting device from direct lubricant splashes. The deflection device can be integrated into the differential housing. It is also conceivable for the deflection device to be designed as an insert.

[0010] This allows the venting device to be protected or shielded from direct lubricant splashes using simple means.

[0011] According to a further development of the differential, the differential housing can be constructed in two parts. The differential housing can be formed from a first shaft part and a second shaft part. The first shaft part and the second shaft part, and thus the differential housing, are designed to be rotatable about the rotational axis.

[0012] This allows the differential housing to be implemented using simple means.

[0013] According to a further development of the differential, the first shaft part and the second shaft part can be connected to one another (in a rotationally fixed manner) in a connecting plane. The venting device can be arranged at a distance from the connecting plane. The first shaft part and the second shaft part can be connected to one another by a material fit. It is conceivable that a flange can be arranged on each of the first and the second shaft parts, wherein the respective flanges are connected or screwed to one another by means of screws. Other connection types are also conceivable. The two shaft parts can be connected to one another, for example, by means of friction welding, press fit, etc.

[0014] This allows the two-part differential housing to be implemented using simple means.

[0015] According to a further development of the differential, at least one output shaft, in particular both output shafts, can be arranged at least partially within the first and / or second shaft part. The first and / or second shaft part can each be designed as a hollow shaft, at least partially.

[0016] This allows the differential to be implemented particularly compactly.

[0017] According to a further development of the differential, the first shaft part, the second shaft part, the two output shafts and the axis of rotation can be arranged coaxially to one another.

[0018] This allows the differential to be implemented particularly compactly.

[0019] According to a further development of the differential, the first shaft part and / or the second shaft part can each have an external toothing for torque transmission.

[0020] This allows particularly efficient torque transmission to be achieved using simple means.

[0021] According to a further development of the differential, the differential may include a redundancy chamber. The redundancy chamber may at least partially surround the differential housing, particularly in the area of ​​the venting device.

[0022] This allows a particularly high level of differential tightness to be achieved using simple means.

[0023] According to the invention, a drive arrangement for a vehicle, in particular for a motor vehicle, comprising at least one differential as described above is proposed. The differential can, in particular, be a centrally and / or coaxially arranged differential.

[0024] Regarding the advantages that can be achieved, please refer to the relevant comments on the differential. The measures described in connection with the differential and / or those explained below can be used to further refine the drive arrangement.

[0025] The drive assembly can, for example, be designed as an electric axle or form a component of an electric axle. The drive assembly can comprise at least one electric motor. The electric motor can be drivingly coupled to the differential housing, in particular to the first shaft part and / or the second shaft part. In other words, torque can be transmitted between the electric motor and the differential housing, in particular to the first shaft part and / or the second shaft part.

[0026] An embodiment of the invention is explained below with reference to the accompanying drawings. They show: Fig. 1 a sectional view of a differential along a rotation axis.

[0027] The differential contributes in Fig. 1 is designated overall by reference numeral 10. The differential 10 is configured for a drive arrangement. The drive arrangement may be a drive arrangement for a vehicle, in particular for a motor vehicle.

[0028] The differential 10 comprises two side gears 12, each of which is rotationally fixedly mounted on an output shaft 14. The output shafts 14 are oriented along a rotation axis 16. The output shafts 14 are particularly designed to be rotatable about the rotation axis 16.

[0029] The differential 10 comprises a differential pin 18 with two differential gears 20. The differential gears 20 are rotatably (or non-rotatably) arranged on the differential pin 18. The differential gears 20 mesh with the side gears 12.

[0030] The differential 10 comprises a differential housing 22. The side gears 12 and the differential pin 18 with the differential gears 20 are arranged within the differential housing 22. The differential pin 18 is rotationally fixedly coupled to the differential housing 22. The differential pin 18 and the differential housing 22 are, in particular, designed to be rotatable about the rotation axis 16.

[0031] The differential 10 comprises a venting device 24 for venting and / or relieving pressure from the differential 10. The venting device 24 is arranged in or on the differential housing 22.

[0032] The venting device 24 here comprises a vent screw 26 with an integrated check valve. The vent screw 26 is screwed into a screw opening 27 arranged in the differential housing 22. The screw opening 27 is designed as a through-hole. For better sealing, the venting device 24 can comprise a sealing washer (not shown) that can be arranged around the vent screw 26. The sealing washer can be designed as a sealing washer.

[0033] The differential 10 may include a deflection device (not shown). The deflection device may be arranged within the differential housing 22 and in the region of the venting device 24. The deflection device may be configured to shield or protect the venting device 24 (particularly on the inside of the differential housing 22) from lubricant splashes.

[0034] The differential housing 22 is constructed in two parts. The differential housing 22 is formed from a first shaft part 28 and a second shaft part 30. The two shaft parts 28, 30 thus form the differential housing 22.

[0035] The first shaft part 28 and the second shaft part 30 are connected to each other in a connecting plane 32. The connecting plane 32 is oriented perpendicular to the rotation axis 16. The venting device 24 is arranged at a distance from the connecting plane 32.

[0036] At least one output shaft 14 can be arranged at least partially within the first and / or second shaft part 28, 30. In the present case, the Fig. 1 left output shaft 14 is arranged at least partially within the first shaft part 28. The Fig.1 right output shaft 14 is arranged at least in sections within the second shaft part 30.

[0037] The two shaft parts 28, 30 are each designed as a hollow shaft, at least in sections.

[0038] The first shaft part 28, the second shaft part 30, the two output shafts 14 and the rotation axis 16 are arranged coaxially to one another.

[0039] The first shaft part 28 and the second shaft part 30 each have external teeth 34 for torque transmission. In other words, a torque can be transmitted between the first shaft part 28 and, for example, an electrical machine (not shown) by means of the external teeth 34 of the first shaft part 28. Analogously, a torque can be transmitted between the second shaft part 30 and, for example, the electrical machine (or another electrical machine) by means of the external teeth 34 of the second shaft part 30.

[0040] The differential 10 here comprises a redundancy chamber 36. The redundancy chamber 36 at least partially surrounds the differential housing 22. The redundancy chamber 36 surrounds the differential housing 22, in particular in the region of the venting device 24. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2018 125 460 A1

[0003]

Claims

[1] Differential (10) for a drive arrangement comprising: - two side wheels (12), each of which is arranged non-rotatably on an output shaft (14), wherein the output shafts (14) are oriented along an axis of rotation (16), - a differential pin (18) with two compensating gears (20), wherein the compensating gears (20) are rotatably arranged on the differential pin (18), wherein the compensating gears (20) mesh with the side gears (12), - a differential housing (22), wherein the side gears (12) and the differential pin (18) with the compensating gears (20) are arranged inside the differential housing (22), wherein the differential pin (18) is rotationally fixed to the differential housing (22), - a venting device (24) for venting and / or relieving pressure of the differential (10), wherein the venting device (24) is arranged in or on the differential housing (22). [2] Differential (10) according to claim 1, characterized by, that the venting device (24) includes a venting screw (26) with an integrated check valve. [3] Differential (10) according to claim 1 or 2, characterized by , that a deflection device is arranged within the differential housing (22) and in the area of ​​the venting device (24). [4] Differential (10) according to any one of the preceding claims, characterized by , that the differential housing (22) is formed in two parts, consisting of a first shaft part (28) and a second shaft part (30). [5] Differential (10) according to claim 4, characterized by , that the first shaft part (28) and the second shaft part (30) are connected to each other in a connecting plane (32), in particular oriented perpendicular to the axis of rotation (16), wherein the venting device (24) is arranged at a distance from the connecting plane (32). [6] Differential (10) according to claim 4 or 5, characterized by, that at least one output shaft (14), in particular both output shafts (14), are arranged at least sectionally within the first and / or the second shaft part (28, 30). [7] Differential (10) according to any one of claims 4 to 6, characterized by , that the first shaft part (28), the second shaft part (30), the two output shafts (14) and the axis of rotation (16) are arranged coaxially to each other. [8] Differential (10) according to any one of claims 3 to 6, characterized by that the first shaft part (28) and / or the second shaft part (30) each have an external toothing (34) for torque transmission. [9] Differential (10) according to any one of the preceding claims, characterized by , that the differential (10) includes a redundancy chamber (36), wherein the redundancy chamber (36) at least partially surrounds the differential housing (22), particularly in the area of ​​the venting device (24). [10] Drive arrangement for a vehicle, in particular for a motor vehicle, comprising at least one differential (10) according to one of the preceding claims.

Images