Electrically operable axle drive train

Abstract

An electrically operable axle drive train for a motor vehicle, comprising an electric machine accommodated in a motor housing, and a transmission assembly accommodated in a transmission housing, wherein the electric machine and the transmission assembly form a structural unit, and a ventilation channel extending through the transmission housing, opposite the direction of gravity, connects the transmission assembly within the transmission housing to the environment, wherein a separator cartridge designed as a separate component from the transmission housing is introduced into the ventilation channel and is configured such that it reduces the flow rate of a hydraulic fluid in the ventilation channel.

Claims

1. An electrically operable axle drive train for a motor vehicle, comprising an electric machine accommodated in a motor housing, and a transmission assembly accommodated in a transmission housing, wherein the electric machine and the transmission assembly form a structural unit, and a ventilation channel extending through the transmission housing, opposite a direction of gravity, connects the transmission assembly within the transmission housing to the environment, wherein a separator cartridge having a first end face having a first opening and a second end face having a second opening and designed as a separate component from the transmission housing is introduced into the ventilation channel and is configured to reduce the flow rate of a hydraulic fluid in the ventilation channel, wherein a plug is arranged on the second end face, which extends in an axial direction from a main body, wherein the plug has an outlet channel which is connected by the second opening of the second end face to an interior of the main body.

2. The axle drive train according to claim 1, wherein the ventilation channel has a first channel section extending in the direction of gravity, from which a second channel section extends in a radial and axial direction through the transmission housing to the transmission assembly, and the separator cartridge is arranged in the second channel section.

3. The axle drive train according to claim 1, wherein the separator cartridge is made of a plastic.

4. The axle drive train according to claim 1, wherein the separator cartridge is at least one of form-fittingly or frictionally fixed in the ventilation channel.

5. The axle drive train according to claim 1, wherein the hydraulic fluid can flow through the first opening of the first end face and through the second opening of the second end face.

6. The axle drive train according to claim 5, wherein the plug is arranged eccentrically with respect to the cylindrical main body.

7. The axle drive train according to claim 5, wherein a screen element is arranged in the interior axially offset in front of the second opening so that an axial flow of the hydraulic fluid to the second opening from the interior is prevented.

8. The axle drive train according to claim 5, wherein the first opening of the first end face comprises at least two inlet openings which are arranged in the direction of gravity above a return opening provided in the first end face.

9. The axle drive train according to claim 1, wherein radially projecting ribs are formed on an outer lateral surface of the main body.

10. A transmission assembly for an electrically operable axle drive train for a motor vehicle, comprising a transmission housing accommodating the transmission assembly, and a ventilation channel extending through the transmission housing, opposite a direction of gravity, connecting the transmission assembly within the transmission housing to the environment, wherein a separator cartridge having a first end face having a first opening and a second end face having a second opening and designed as a separate component from the transmission housing is introduced into the ventilation channel and is configured to reduce the flow rate of a hydraulic fluid in the ventilation channel, wherein a plug is arranged on the second end face, which extends in an axial direction from a main body, wherein the plug has an outlet channel which is connected by the second opening of the second end face to an interior of the main body.

11. The transmission assembly according to claim 10, wherein the ventilation channel has a first channel section extending in the direction of gravity, from which a second channel section extends in a radial and axial direction through the transmission housing to the transmission assembly, and the separator cartridge is arranged in the second channel section.

12. The transmission assembly according to claim 10, wherein the separator cartridge is made of a plastic.

13. The transmission assembly according to claim 10, wherein the separator cartridge is at least one of form-fittingly or frictionally fixed in the ventilation channel.

14. The transmission assembly according to claim 10, wherein the hydraulic fluid can flow through the first opening of the first end face and through the second opening of the second end face.

15. The transmission assembly according to claim 14, wherein the plug is arranged eccentrically with respect to the cylindrical main body.

16. The transmission assembly according to claim 14, wherein a screen element is arranged in the interior axially offset in front of the second opening so that an axial flow of the hydraulic fluid to the second opening from the interior is prevented.

17. The transmission assembly according to claim 14, wherein the first opening of the first end face comprises at least two inlet openings which are arranged in the direction of gravity above a return opening provided in the first end face.

18. The transmission assembly according to claim 10, wherein radially projecting ribs are formed on an outer lateral surface of the main body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The disclosure is explained in more detail below with reference to drawings without limiting the general concept of the disclosure.

(2) In the Drawings:

(3) FIG. 1 shows an axle drive train in a perspective axial sectional view;

(4) FIG. 2 shows a detailed view of a ventilation channel in a transmission housing in a perspective axial sectional view;

(5) FIG. 3 shows a separator cartridge in a perspective view, a frontal view and a rear view;

(6) FIG. 4 shows a separator cartridge in an axial sectional view and a top view;

(7) FIG. 5 shows a motor vehicle having an electrically operable axle drive train in a schematic block diagram.

DETAILED DESCRIPTION

(8) FIG. 1 shows an electrically operable axle drive train 1 for a motor vehicle 2, as is also shown by way of example in FIG. 5.

(9) The axle drive train 1 comprises an electric machine 4 accommodated in a motor housing 3 and a transmission assembly 6 accommodated in a transmission housing 5, wherein the electric machine 4 and the transmission assembly 6 form a structural unit 7.

(10) In the example shown, the transmission assembly 6 is a wet-running planetary transmission configuration which is arranged axially immediately adjacent to the electric machine 4.

(11) A ventilation channel 8 extending through the transmission housing 5, opposite the direction of gravity, connects the transmission assembly 6 within the transmission housing 5 to the environment. A separator cartridge 9 designed as a separate component from the transmission housing 5 is inserted in the ventilation channel 8 and is configured to reduce the flow rate of a hydraulic fluid 10 in the ventilation channel 8.

(12) It can also be seen from FIG. 1 that the ventilation channel 8 has a first channel section 11 extending in the direction of gravity and from which a second channel section 12 extends in the radial direction and axial direction through the transmission housing 5 to the transmission assembly 6 and the separator cartridge 9 is arranged in the second channel section 12.

(13) The ventilation channel 8 opens in the direction of the transmission assembly 6 radially above a freewheel device 27, which coaxially encloses a first ring gear 28 of the transmission device 6.

(14) The separator cartridge 9 is explained in more detail below with reference to FIGS. 2-4. The separator cartridge 9 is made of a plastic, in particular by means of an injection molding process, and is fixed form-fittingly and/or frictionally in the ventilation channel 8.

(15) The separator cartridge 9 has a cylindrical main body 13, through the interior 14 of which hydraulic fluid 10 can flow through a first opening 20 of a first end face 15 and through a second opening 21 of a second end face 16, which can be clearly seen from FIGS. 3-4. The first opening 20 of the first end face 15 has at least two inlet openings 23, 24 which are arranged in the direction of gravity above a return opening 25 provided in the first end face 15. Radially projecting ribs 26 are formed on the outer lateral surface of the main body 13, by means of which the separator cartridge 9 is pressed in the ventilation channel 8.

(16) A plug 17 is arranged on the second end face 16 and extends out of the main body 13 in the axial direction, wherein the plug 17 has an outlet channel 18 which is connected to the interior 14 of the main body 13 through the second opening 21 of the second end face 16. The plug 17 is arranged eccentrically with respect to the cylindrical main body 13.

(17) It can be seen from FIG. 4 that a screen element 19 is arranged in the interior 14 axially offset in front of the second opening 21, so that an axial flow of the hydraulic fluid 10 to the second opening 21 from the interior 14 is prevented, which is indicated by the corresponding arrows.

(18) Hydraulic fluid 10 and air 29 enter the interior 14 of the main body 13 of the separator cartridge 9 through the inlet openings 23, 24. Hydraulic fluid 10 and air 29 are then distributed in the interior 14 of the separator cartridge 9 during operation of the axle drive train 1. A portion of the hydraulic fluid 10 and the air 29 enters the head space 30 of the separator cartridge 9 via a type of labyrinth guide which is defined by the screen element 19 located in the flow direction of the hydraulic fluid 10. The head space 30 is thus defined by the screen element 19, extending in each case in a radial plane, and the second end face 16.

(19) The screen element 19, which is formed monolithically with the main body 13, prevents or minimizes the direct inflow of the hydraulic fluid 10 into the second opening 21 of the second end face 16. Owing to the resulting diversion of the fluid flow of hydraulic fluid 10 from an axial direction to a radial direction, the hydraulic fluid 10 is directed downwards so that a large part of it returns to the transmission assembly 6 via the return opening 25. Air 29, which is to be guided out of the transmission assembly 6, passes via the opening 21 and the outlet channel 18 into the second channel section 12 of the ventilation channel 8.

(20) The disclosure is not limited to the embodiments shown in the figures. The above description is therefore not to be regarded as limiting, but rather as illustrative. The following claims are to be understood as meaning that a stated feature is present in at least one embodiment of the disclosure. This does not exclude the presence of further features. Where the claims and the above description define first and second features, this designation serves to distinguish between two features of the same type without defining an order of precedence.

LIST OF REFERENCE SIGNS

(21) 1 Axle drive train 2 Motor vehicle 3 Motor housing 4 Electric machine 5 Transmission housing 6 Transmission assembly 7 Unit 8 Ventilation channel 9 Separator cartridge 10 Hydraulic fluid 11 Channel section 12 Channel section 13 Main body 14 Interior 15 End face 16 End face 17 Plug 18 Outlet channel 19 Screen element 20 Opening 21 Opening 23 Inlet opening 24 Inlet opening 25 Return opening 26 Ribs 27 Freewheel device 28 Ring gear 29 Air 30 Head space