Gearbox arrangement for an electrically driven vehicle, drive arrangement for an electrically driven vehicle, and vehicle

Abstract

A transmission assembly (1) for an electric vehicle (34) includes: a transmission element (2); a parking lock (6) by which the transmission element (2) can be locked, and the parking lock has a parking lock actuator (8); a transmission housing (9) surrounding the transmission element (2) and the parking lock (6); and a pressure balancing device (14) by means of which the interior of the parking lock actuator (8) is ventilably connected to the exterior of the transmission housing (9), wherein the pressure balancing device (14) has a conducting element (16) passing through an opening (15) in the transmission housing 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 conducting element (16).

Description

Technical Field

[0001] The present invention relates to a transmission device for an electric vehicle, a drive device for an electric vehicle, and a vehicle. Background Technology

[0002] Document DE 10 2015 217 875 A1 discloses a drive system for a motor vehicle having an electric motor and a transmission. The transmission has a transmission output shaft and a transmission housing, as well as a parking lock.

[0003] Integrating the parking lock into the transmission housing saves scarce structural space, especially when using a transmission unit in a vehicle's electric drive system. However, this presents unique challenges due to the lubricating oil and high temperatures within the transmission housing. In particular, the parking lock actuator can react sensitively to the lubricating oil, even to the point of malfunction. Summary of the Invention

[0004] The present invention is based on the objective of providing a reliable and operable option for arranging a parking lock in the transmission housing, which can be easily implemented.

[0005] According to the present invention, this objective is achieved by a transmission device for an electrically driven vehicle, the transmission device comprising: a transmission element; a parking lock capable of locking the transmission element, the parking lock having a parking lock actuator; a transmission housing surrounding the transmission element and the parking lock; and a pressure balancing device through which the interior of the parking lock actuator is ventilatedly connected to the exterior of the transmission housing, wherein the pressure balancing device has a conducting element passing through an opening in the transmission housing and a fluid guiding element, a first end of the fluid guiding element being connected to the interior of the parking lock actuator and a second end of the fluid guiding element being connected to the conducting element.

[0006] This invention is based on the discovery that malfunctions of parking lock actuators are typically attributable to lubricating oil intrusion. This intrusion is caused by the pressure difference between the interior of the parking lock actuator and its surrounding environment. The pressure balancing device provided in the transmission assembly according to the invention balances the pressure between the interior of the parking lock actuator and the exterior of the transmission housing, thereby preventing lubricating oil intrusion. This advantageously results in more robust operation of the transmission assembly. Because the conducting element is directly inserted into the opening in the transmission housing, the pressure balancing device can be implemented with particularly minimal effort.

[0007] The fluid guiding element is preferably designed as a tube or hose. In an advantageous embodiment, the fluid guiding element is made of plastic, such as PTFE or PPA.

[0008] In the case of the transmission device according to the invention, preferably, the pressure balancing device has a connector at the first end of the fluid guiding element, which is latched to a diameter-opposite connector of the parking lock actuator, the parking lock actuator connector preferably being formed on the parking lock actuator housing. Alternatively or additionally, the pressure balancing device may be configured to have a connector at the second end of the fluid guiding element, which is latched to a diameter-opposite connector of the conducting element. The fluid guiding element can be easily arranged on the parking lock actuator or the conducting element for removability and ease of maintenance, as the fluid guiding element can be easily replaced in the event of a failure in the fluid guiding element or the connector on the fluid guiding element side.

[0009] It can be advantageously configured that the connector at the first end of the fluid guiding element is designed as a cup-shaped connector, and / or the connector at the second end of the fluid guiding element is designed as a cup-shaped connector.

[0010] Also advantageous is that the connector of the parking lock actuator and / or the connector of the conducting element has a latch collar.

[0011] In an advantageous embodiment of the transmission device according to the invention, the conducting element may also be configured to have a membrane outside the transmission housing.

[0012] To prevent dust and other unwanted substances from entering the pressure balancing device, the transmission device according to the invention may provide a breathable protective cap for the conducting element at its free end located outside the transmission housing.

[0013] In the case of the transmission device according to the invention, it is also preferred that the conducting element has at least one sealing device that seals the conducting element relative to the opening in the transmission housing. This also prevents lubricating oil from escaping through the through opening. According to one development, the sealing device may comprise one or more sealing rings. This sealing ring, or a corresponding sealing ring, may surround the conducting element in the circumferential direction.

[0014] If the connecting element is press-fitted into the transmission housing opening, its arrangement is particularly easy to achieve. Alternatively, the connecting element can be screwed into the transmission housing opening. According to yet another alternative, it can be specified that the connecting element and the plug connector pass through a common transmission housing opening. In this case, the connecting element can, for example, pass through the plug connector housing, particularly the flange portion of the plug connector housing.

[0015] The objective of this invention is also achieved by a drive device for an electric vehicle, the drive device comprising an electric motor, a transmission device according to the invention, and a shaft for transmitting the rotational motion of the electric motor to the transmission device.

[0016] It can be defined that the transmission housing is part of the housing that surrounds the motor, transmission unit, and shaft.

[0017] Finally, the objective of this invention is also achieved by a vehicle comprising a drive mechanism according to the invention, the drive mechanism being configured to drive the vehicle. Attached Figure Description

[0018] Further advantages and details of the invention will become apparent from the exemplary embodiments described below and based on the accompanying drawings. These are schematic diagrams, in which:

[0019] Figure 1 A front view of an exemplary embodiment of the transmission device according to the present invention in the open state is shown;

[0020] Figure 2 A perspective view of the parking lock actuator and pressure balancing device is shown;

[0021] Figure 3 A cross-sectional view of the conducting element is shown;

[0022] Figure 4 A perspective view of the conducting element is shown; and

[0023] Figure 5 A schematic diagram of an exemplary embodiment of a vehicle according to the invention, having an exemplary embodiment of a drive device according to the invention, is shown. Detailed Implementation

[0024] Figure 1 This is a front view of an exemplary embodiment of the transmission device 1 in the open state.

[0025] The transmission assembly 1 includes a transmission element 2, which is coupled to another transmission element 3 to convert rotational motion provided by a shaft 4, which is connected to the transmission element 2 to rotate with it. A parking lock wheel 5 of the parking lock 6 is also secured 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 engage with the parking lock wheel 5 via a parking lock actuator 8 of the parking lock 6.

[0026] Transmission components 2 and 3 and parking lock 6 are enclosed by transmission housing 9. For lubrication of transmission components 2 and 3, transmission unit 1 has an oil sump. Figure 1 The dashed line A indicates the normal operating fill level of the lubricating oil sump. It can be seen that the parking lock 6 is partially located within the lubricating oil sump.

[0027] For the sake of completeness, Figure 1A connection device 10 is also shown, which includes a cable arrangement 11 extending inside the transmission housing 9, a first plug connector 12, and a second plug connector 13. Plug connectors 12 and 13 are attached to opposite ends of the cable arrangement 11, wherein the second plug connector 13 is connected to a parking lock actuator 8. The parking lock actuator 8 can be powered and activated externally via the connection device 10.

[0028] The transmission assembly 1 includes a pressure balancing device 14, which in Figure 1 Most of the interior of the parking lock 6 and the connecting device 10 are hidden by the pressure balancing device 14, through which the interior of the parking lock actuator 8 is connected to the exterior of the transmission housing 9 in a breathable manner, and the pressure balancing device 14 passes through the transmission housing opening 15. The transmission housing opening 15 and another transmission housing opening for the passage of the first plug connector 12 are formed separately.

[0029] Figure 2 This is a perspective view of the parking lock actuator 8 and the pressure balancing device 14. Also shown are the connecting device 10 and the transmission housing 9 (indicated by dashed lines), which has a transmission through-opening 15 for the pressure balancing device 14.

[0030] The pressure balancing device 14 includes a conducting element 16 passing through the transmission housing opening 15 and a fluid guiding element 17, with a first end of the fluid guiding element 17 connected to the interior of the parking lock actuator 8 and a second end of the fluid guiding element 17 connected to the conducting element 16.

[0031] At the first end of the fluid guiding element 17, the pressure balancing device 14 has a first connector 18, which is latched to a diameter-opposing connector formed on the parking lock actuator housing 19. Figure 2 The middle is hidden. At the second end of the fluid guiding element 17, the pressure balancing device 14 has a second connector 20, which is latched to the diameter-opposite connector 21 of the conducting element 16, the connector 21 (see Figure 3 and Figure 4 )exist Figure 2 It is hidden in the middle.

[0032] Therefore, the connectors 18, 20, and 21 of the pressure balancing device 14, and each of the connectors formed on the parking lock actuator housing 19, are designed as cup-shaped connectors, wherein each of the connectors 21 and the connectors on the parking lock actuator housing 19 has a latching collar 22 (see...). Figure 3 and Figure 4 ).

[0033] The fluid guiding element 17 is designed as a dimensionally stable tube that wraps around the connecting device 10 and is secured to the cable arrangement 11 by fastening devices 23 arranged on the fluid guiding element 17. Fastening devices 24 of the connecting device 10 can also be seen, which are attached to the cable arrangement 11 and secure the connecting device 10 within the transmission housing 9.

[0034] Figure 3 and Figure 4 Each shows a conducting element 16, in which Figure 3 It is a sectional view. Figure 4 It is a perspective view.

[0035] The conducting element 16 includes an elongated body 25. A cylindrical gap 27, tapering towards the outer end of the body 25, extends along the longitudinal axis 26 of the body 25. A latching collar 22 is provided on the outer side of the body 25, configured to form a cup-shaped connector 21. A plurality of radially outwardly pointing protrusions 28 of the body are provided for securing the conducting element 16 in the transmission housing opening 15 by press-fit. A similarly radially outwardly pointing collar 29 of the body 25 rests externally on the transmission housing 9 and forms a stop for insertion of the conducting element 16.

[0036] Furthermore, the conductive element 16 has a diaphragm 30 outside the transmission housing 9 and a breathable protective cap 31 at its free end or the free end of the body 25. Additionally, a sealing device 31 is provided, comprising two sealing rings 32 arranged coaxially with respect to the longitudinal axis 26 on the body 25.

[0037] According to another exemplary embodiment, the conductive element 16 is screwed into the housing opening 15. According to yet another exemplary embodiment, the conductive element 16 and the first plug connector 12, along with the same through opening, are passed through. For this purpose, the flange portion 12a of the first plug connector (see...) Figure 2 It can expand accordingly and be passed through the conducting element 16.

[0038] Figure 5 This is a schematic diagram of an exemplary embodiment of a vehicle 34 having a drive unit 35.

[0039] The drive unit 35 configured to drive the vehicle 34 includes a motor 36, a transmission unit 1, and a shaft 4, which is configured to transmit the rotational motion of the motor to the transmission unit 1.

[0040] The transmission housing 9 is part of the housing 37 that surrounds the motor 36, the shaft 4, and the transmission assembly.

[0041] Furthermore, the drive unit 35 has an inverter 38 configured to convert DC voltage into AC voltage to supply the motor 36. The inverter 38 is connected via cable 39 to the first plug connector 12 of the connection device 10 (see...). Figure 1 ), so as to electrically supply power and activate the parking lock 8.

Claims

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

2. The transmission arrangement according to claim 1, wherein the coupling (18) at the first end of the fluid guiding element (17) is designed as a cup-shaped coupling and / or the coupling (20) at the second end of the fluid guiding element (17) is designed as a cup-shaped coupling.

3. The transmission arrangement according to claim 1 or 2, wherein the coupling of the parking lock actuator (8) and / or the coupling of the lead-through element has a latching collar (22).

4. The transmission arrangement according to claim 1 or 2, wherein the lead-through element (16) has a membrane (30) outside the transmission housing (9).

5. The transmission arrangement according to claim 1 or 2, wherein the lead-through element (16) has a gas-permeable protective cap (31) at its free end outside the transmission housing (9).

6. The transmission arrangement according to claim 1 or 2, wherein the lead-through element (16) has at least one sealing means (31) which seals the lead-through element (16) with respect to the transmission housing opening (15).

7. The transmission arrangement according to claim 6, wherein the sealing means (31) comprises one or more sealing rings (32).

8. The transmission arrangement according to claim 1 or 2, wherein the lead-through element (16) - is fastened in the transmission housing opening (15) by a press fit, or - is screwed into the transmission housing opening (15), or - passes through a common transmission housing opening with the plug connector (12).

9. A drive arrangement (35) for an electrically driven vehicle (34), comprising - an electric machine (36), - a transmission arrangement (1) according to any one of the preceding claims, and - a transmission arrangement (1) according to any one of the preceding claims. - transmitting a rotational movement of the electric machine to a shaft (4) of the transmission device (1).

10. Drive arrangement 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 arrangement (1) according to claim 9 or 10, the drive arrangement being configured for driving the vehicle (34).

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