Transmission device for an electrically driven vehicle, drive device for an electrically driven vehicle and vehicle

Description

[0001] Transmission device for an electrically powered vehicle, drive device for an electrically powered vehicle and vehicle

[0002] The present invention relates to a transmission device for an electrically powered vehicle, a drive device for an electrically powered vehicle and a vehicle.

[0003] Document DE 10 2015 217 875 A1 discloses a drive system with an electric machine and a gearbox for a motor vehicle. The gearbox includes a gearbox output shaft and a gearbox housing as well as a parking lock.

[0004] Document DE 10 2017 124499 A1 shows a transmission device with a transmission element and a parking lock arranged in a transmission housing.

[0005] The subsequently published document EP 3 670 973 A1 shows a transmission device comprising a transmission element, a parking lock, a connection device and a pressure equalization device, as well as a transmission housing.

[0006] Integrating a parking lock into a gearbox housing saves installation space, which is particularly limited when using the gearbox in an electric vehicle drive system. However, this presents particular challenges due to the presence of lubricants and higher temperatures inside the gearbox housing. In particular, the parking lock actuator can be sensitive to the lubricant, potentially leading to malfunction.

[0007] The invention is based on the objective of providing a method for arranging a parking lock in a gearbox housing that is easy to implement and robust to operate.

[0008] This problem is solved according to the invention by a transmission device for an electrically driven vehicle according to claim 1.

[0009] The invention is based on the finding that malfunctions of the parking lock actuator are frequently due to the ingress of lubricants into the actuator. This ingress is caused by a pressure difference between the interior of the parking lock actuator and its surroundings. The pressure equalization device provided in the transmission assembly according to the invention equalizes the pressure between the interior of the parking lock actuator and the exterior of the transmission housing, thereby preventing lubricant ingress. This advantageously enables more robust operation of the transmission assembly. Because the feedthrough element is inserted directly into the transmission housing opening, the pressure equalization device can be implemented with minimal effort.

[0010] The fluid guide element is preferably designed as a tube or hose. In an advantageous embodiment, the fluid guide element is made of a plastic, for example PTFE or PPA.

[0011] According to the present invention, the pressure equalization device has a coupling at the first end of the fluid guide element, which is latchingly connected to a mating coupling of the parking lock actuator, preferably formed on a parking lock actuator housing. Alternatively or additionally, according to the present invention, the pressure equalization device has a coupling at the second end of the fluid guide element, which is latchingly connected to a mating coupling of the feedthrough element. This allows the fluid guide element to be attached to the parking lock actuator or the feedthrough element easily and detachably, and also makes it easy to maintain, since in the event of a defect in the fluid guide element or the coupling on the fluid guide element side, it can be easily replaced.

[0012] It can be advantageous to provide that the coupling at the first end of the fluid guide element is designed as a cup coupling and / or that the coupling at the second end of the fluid guide element is designed as a cup coupling.

[0013] It is also advantageous if the coupling of the parking lock actuator and / or the coupling of the feedthrough element has or have a locking collar.

[0014] In an advantageous embodiment of the transmission device according to the invention, it can further be provided that the feedthrough element outside the transmission housing has a diaphragm.

[0015] To prevent unwanted ingress of dirt and the like into the pressure equalization device, the transmission device according to the invention may be provided with a gas-permeable protective cap at its free end outside the transmission housing of the feedthrough element.

[0016] In the transmission device according to the invention, it is further preferred if the feedthrough element has at least one sealing element which seals the feedthrough element against the transmission housing opening. This additionally prevents lubricant from escaping through the through-opening. According to a further embodiment, the at least one sealing element may comprise one or more sealing rings. The respective sealing ring(s) may surround the feedthrough element in the circumferential direction.

[0017] A particularly simple arrangement of the feedthrough element is achieved when the feedthrough element is secured in the gearbox housing opening by means of a press fit. Alternatively, the feedthrough element can be screwed into the gearbox housing opening. Another alternative involves the feedthrough element passing through a common gearbox housing opening with a connector. In this case, the feedthrough element can, for example, pass through a connector housing, in particular a flange section of the connector housing.

[0018] The problem underlying the invention is further solved by a drive device for an electrically driven vehicle, comprising an electric machine, a transmission device according to the invention and a shaft that transmits a rotary motion of the electric machine to the transmission device.

[0019] It can be provided that the gearbox housing is part of a housing that encloses the electric machine, the gearbox assembly, and the shaft. The problem underlying the invention is ultimately also solved by a vehicle comprising a drive unit according to the invention designed to propel the vehicle.

[0020] Further advantages and details of the present invention will become apparent from the exemplary embodiments described below and from the

[0021] Drawings, wherein the present invention is defined by the following claims.

[0022] These are schematic representations and show: Fig. 1 a frontal view of an embodiment of the transmission device according to the invention in an open state; Fig. 2 a perspective view of the parking lock actuator and the pressure equalization device; Fig. 3 a sectional view of the feedthrough element; Fig. 4 a perspective view of the feedthrough element; and Fig. 5 a schematic diagram of an embodiment of the vehicle according to the invention with an embodiment of the drive device according to the invention.

[0023] Fig. 1 is a frontal view of an embodiment of a transmission device 1 in an open state.

[0024] The transmission assembly 1 comprises a transmission element 2, which is coupled to further transmission elements 3 to translate a rotary motion provided by a shaft 4 that is non-rotatably connected to the transmission element 2. A parking lock wheel 5 of a parking lock 6 is also attached to the transmission element 2, by which the transmission element 2 can be locked. For this purpose, the parking lock 6 also has a parking lock pawl 7, which can be engaged with the parking lock wheel 5 by means of a parking lock actuator 8 of the parking lock 6.

[0025] The gear elements 2, 3 and the parking lock 6 are enclosed by a gear housing 9. For the lubrication of the gear elements 2, 3, the gear assembly 1 has a lubricant bath, the normal operating fill level of which is indicated by a dashed line A in Fig. 1 As shown, parking barrier 6 is partially submerged in lubricant.

[0026] For the sake of completeness, it shows Fig. 1 Furthermore, a connection device 10 comprises a cable assembly 11 running inside the gearbox housing 9, a first connector 12, and a second connector 13. The connectors 12 and 13 are attached to opposite ends of the cable assembly 11, with the second connector 13 being connected to the parking lock actuator 8. The parking lock actuator 8 can be electrically supplied and controlled externally by means of the connection device 10.

[0027] The transmission unit 1 comprises a - in Fig. 1 The pressure equalization device 14, largely concealed by the parking lock 6 and the connection device 10, connects an inner part of the parking lock actuator 8 to an outer part of the gearbox housing 9 via a gas-permeable connection and passes through a gearbox housing opening 15. This gearbox housing opening 15 and a further gearbox housing opening for the passage of the first connector 12 are formed separately.

[0028] Fig. 2 Figure 1 is a perspective view of the parking lock actuator 8 and the pressure equalization device 14. Furthermore, the connection device 10 and, indicated by dashed lines, the gearbox housing 9 with the gearbox through-opening 15 for the pressure equalization device 14 are shown.

[0029] The pressure equalization device 14 comprises a feedthrough element 16 that passes through the gearbox housing opening 15, and a fluid guide element 17, the first end of which is connected to the interior of the parking lock actuator 8 and the second end of which is connected to the feedthrough element 16.

[0030] At the first end of the fluid guide element 17, the pressure equalization device 14 has a first coupling 18 which engages with a locking mechanism - in Fig. 2 concealed - opposite coupling, which is formed on a parking lock actuator housing 19. At the second end of the fluid guide element 17, the pressure equalization device 14 has a second coupling 20, which engages latchingly with a - in Fig. 2 concealed - opposing coupling 21 (see Fig. 3 and Fig. 4 ) of the implementation element 16 is connected.

[0031] The couplings 18, 20 of the pressure equalization device 14, the coupling 21 and the coupling formed on the parking lock actuator housing 19 are each designed as a cup coupling, wherein the coupling 21 and the coupling on the parking lock actuator housing 19 each have a locking collar 22 (see Fig. 3 and Fig.4 exhibit.

[0032] The fluid guide element 17 is designed as a dimensionally stable tube that winds around the connection device 10 and is attached to the cable assembly 11 by means of a fastening element 23 arranged on the fluid guide element 17. Also visible are fastening elements 24 of the connection device 10 attached to the cable assembly 11, by which the connection device 10 is secured within the gearbox housing 9.

[0033] Fig. 3 and Fig. 4 each shows the implementation element 16, where Fig. 3 a cropped view and Fig. 4 a perspective view.

[0034] The feedthrough element 16 comprises an elongated body 25. A cylindrical clearance 27 extends along a longitudinal axis 26 of the body 25, tapering towards an outer end of the body 25. A locking collar 22, which forms the cup coupling 21, is formed on the outside of the body 25. Several radially outwardly projecting projections 28 of the body are provided for securing the feedthrough element 16 by means of an interference fit in the gearbox housing opening 15. A collar 29 of the body 25, also projecting radially outwardly, rests on the outside of the gearbox housing 9 and forms a stop for inserting the feedthrough element 16.

[0035] In addition, the feedthrough element 16 outside the gearbox housing 9 comprises a diaphragm 30 and at its free end or at the free end of the body 25 a gas-permeable protective cap 31. Furthermore, a sealing element 31 is provided, which comprises two sealing rings 32 arranged coaxially with respect to the longitudinal axis 26 on the body 25.

[0036] According to another embodiment, the feedthrough element 16 is screwed into the housing opening 15. According to another embodiment, the feedthrough element 16 and the first connector 12 pass through the same through-opening. For this purpose, a flange section 12a (see Fig. 2 ) of the first connector be extended accordingly and penetrated by the feedthrough element 16.

[0037] Fig. 5 is a schematic diagram of an embodiment of a vehicle 34 with an embodiment of a drive unit 35.

[0038] The drive unit 35, designed to propel the vehicle 34, comprises an electric machine 36, the transmission unit 1 and the shaft 4, which is designed to transmit a rotary motion of the electric machine to the transmission unit 1.

[0039] The gearbox housing 9 is part of a housing 37 that encloses the electric machine 36, the shaft 4 and the gearbox assembly.

[0040] Furthermore, the drive unit 35 includes an inverter 38, which is configured to convert a DC voltage into an AC voltage that supplies the electric machine 36. The inverter 38 is connected by means of a cable 39 to the first connector 12 of the connection device 10 (see Fig. 1 ) connected to supply and control the parking lock 8 electrically.

Claims

1. Transmission device (1) for an electrically driveable vehicle (34), comprising - a transmission element (2), - a parking lock (6), by means of which the transmission element (2) can be blocked and which has a parking lock actuator (8), and - a transmission housing (9), which encloses the transmission element (2) and the parking lock (6), characterized by - a pressure equalization apparatus (14), by means of which an interior of the parking lock actuator (8) is connected to an exterior of the transmission housing (9) in a gas-permeable manner, wherein the pressure equalization apparatus (14) has a lead-through element (16) which passes through a transmission housing opening (15), and a fluid guiding element (17), the first end of which is connected to the interior of the parking lock actuator (8) and the second end of which is connected to the lead-through element (16), wherein the pressure equalization apparatus (14) - at the first end of the fluid guiding element (17) has a coupling (18) which is connected in a latching manner to a diametrically opposed coupling of the parking lock actuator, which coupling is preferably formed on a parking lock actuator housing (19), and / or - at the second end of the fluid guiding element (17) has a coupling (20) which is connected in a latching manner to a diametrically opposed coupling (21) of the lead-through element (16).

2. Transmission device according to Claim 1, wherein the coupling (18) at the first end of the fluid guiding element (17) is designed as a cup coupling and / or the coupling (20) at the second end of the fluid guiding element (17) is designed as a cup coupling.

3. Transmission device according to Claim 1 or 2, wherein the coupling of the parking lock actuator (8) and / or the coupling of the lead-through element (21) has or have a latching collar (22).

4. Transmission device according to one of the preceding claims, wherein the lead-through element (16) has a membrane (30) outside the transmission housing (9).

5. Transmission device according to one of the preceding claims, wherein the lead-through element (16) has a gas-permeable protective cap (31) at its free end outside the transmission housing (9).

6. Transmission device according to one of the preceding claims, wherein the lead-through element (16) has at least one sealing means (31) which seals the lead-through element (16) in relation to the transmission housing opening (15).

7. Transmission device according to Claim 6, wherein the at least one sealing means (31) comprises one or more sealing rings (32).

8. Transmission device according to one of the preceding claims, wherein the lead-through element (16) - is fastened by means of a press fit in the transmission housing opening (15) or - is screwed into the transmission housing opening (15) or - is passed through a common transmission housing opening with a plug connector (12).

9. Drive device (35) for an electrically driveable vehicle (34), comprising - an electric machine (36), - a transmission device (1) according to one of the preceding claims, and - a shaft (4) transmitting a rotational motion of the electric machine (35) to the transmission device (1).

10. Drive device according to Claim 9, wherein the transmission housing (9) is part of a housing (37) enclosing the electric machine (36), the transmission device (1), and the shaft (4).

11. Vehicle (34), comprising a drive device (1) according to Claim 9 or 10, which is configured for driving the vehicle (34).