Transmission assembly for vehicle and vehicle

Abstract

The invention relates to a transmission assembly for a vehicle, comprising: an assembly housing (1); the gearbox (2) and the motor shell (3) are integrally arranged in the assembly shell (1); a heat exchanger (4); the invention relates to a motor assembly comprising an assembly housing (1), a gearbox (2), a heat exchanger (4), and a lubrication system arranged in the assembly housing (1), characterized in that the lubrication system comprises: a first fluid channel (S1) between the gearbox (2) and the heat exchanger (4), a second fluid channel (S2) between the motor housing (3) and the heat exchanger (4), and a pump device (P), a lubricating medium can be selectively communicated with the first fluid channel (S1) or the second fluid channel (S2) by means of the pump device (P), so that the lubricating medium selectively flows into the gearbox (2) or the motor shell (3) and is conveyed to the heat exchanger (4). The invention further relates to a vehicle comprising the transmission assembly.

Description

Technical Field

[0001] The invention relates to a transmission assembly for a vehicle and a vehicle comprising the transmission assembly. Background Art

[0002] In vehicles, especially electric vehicles, a drive motor system is used to drive the vehicle. With the continuous pursuit of lightweight, compact structure and energy saving and emission reduction of vehicles, the modularization of E-Axle (electric bridge) is often used to integrate the motor, gearbox, inverter and the like. During the operation of the vehicle, the motor and gearbox need to be cooled and lubricated by means of a cooling and lubrication system. In the design method of the prior art, a pump device is used to pump the lubricating oil at the gearbox and the motor to the heat exchanger, wherein the pump device sucks the lubricating oil existing in the gearbox and the motor from the gearbox side alone or from two suction sides at the same time. However, when the vehicle is in a non-horizontal position, for example, when the vehicle is driving on a slope, driving on a curve or accelerating and decelerating, the vehicle body often tilts, which causes the lubricating oil on one side of the gearbox and the motor to migrate to the other side, which makes the liquid level on the corresponding suction side of the pump device lower, and the oil suction port is exposed to the air, and even air suction occurs, causing cavitation and poor cooling and lubrication, which affects the service life of the vehicle on the one hand, and damages the power system on the other hand. Summary of the invention

[0003] In view of the drawbacks of the prior art, the technical problem to be solved by the present invention is to provide a transmission assembly for a vehicle with more reliable operation and better functionality.

[0004] To solve the technical problem, the present invention provides a transmission assembly for a vehicle, comprising: an assembly housing; a gear box and a motor housing integrated in the assembly housing; a heat exchanger; and a cooling and lubrication system, wherein the cooling and lubrication system is arranged in the assembly housing.

[0005] The transmission assembly may be and / or include a two-way oil suction system assembly for a vehicle.

[0006] According to one embodiment of the present invention, the cooling lubrication system includes: a first fluid channel between the gear box and the heat exchanger, a second fluid channel between the motor housing and the heat exchanger, and a pump device, by means of which the lubricating medium can selectively connect the first fluid channel or the second fluid channel, thereby selectively flowing into the gear box or the motor housing and being delivered to the heat exchanger.

[0007] Compared with the bidirectional suction pump device in the prior art, the pump device according to the present invention selectively draws lubricating oil from a position where the lubricating oil level is sufficiently high on one side. Even if the lubricating oil level on one side drops due to the vehicle tilting during driving, the problem of insufficient suction pressure caused by the low liquid level on the suction side of the pump device will not occur, thereby avoiding harmful cavitation and poor cooling and lubrication in the pump device, thereby ensuring reliable and smooth operation of the power system.

[0008] The electric drive assembly system according to the present disclosure may also have one or more of the following features alone or in combination.

[0009] According to one embodiment of the present disclosure, the transmission assembly includes a valve device, which includes a valve body, and the valve device is used to switch the first fluid channel and the second fluid channel, wherein the first fluid channel connects a gear box connected to the suction side of the pump device and a heat exchanger connected to the pressure side of the pump device; and the second fluid channel connects a motor housing connected to the suction side of the pump device and a heat exchanger connected to the pressure side of the pump device.

[0010] According to one embodiment of the present disclosure, the pump device is a bidirectional reversible suction pump, including a first end and a second end. When the pump device operates in a first direction, the first end is the suction side and the second end is the pressure side; when the pump device operates in a second direction opposite to the first direction, the second end is the suction side and the first end is the pressure side.

[0011] The pump device according to this embodiment can have its suction side and pressure side switched between its first end and second end, thereby achieving bidirectional reversible suction.

[0012] According to an embodiment of the present disclosure, the transmission assembly includes a sensor device for detecting the operating state of the vehicle, wherein the pump device is controlled to operate in the first direction or the second direction by means of a sensor signal generated by the sensor device.

[0013] According to one embodiment of the present disclosure, the running state of the vehicle includes a tilt state of the vehicle and / or an acceleration of the vehicle.

[0014] According to one embodiment of the present disclosure, the transmission assembly includes a pump drive motor for driving the pump device to operate, and the pump device is controlled to operate in the first direction or the second direction according to the current intensity of the pump drive motor.

[0015] When the current intensity falls below the set threshold, this means that pump idling has occurred, which may be attributed to a drop in the liquid level, and the running direction of the pump drive motor should be adjusted.

[0016] Accordingly, the running direction of the pump drive motor can be flexibly adjusted according to the current running state of the vehicle, so that the appropriate suction side-pressure side setting can be selected in time to reliably avoid empty suction of the pump device.

[0017] According to one embodiment of the present disclosure, the valve device includes a plurality of one-way valves.

[0018] According to one embodiment of the present disclosure, the plurality of one-way valves have a common valve body.

[0019] According to one embodiment of the present disclosure, the plurality of one-way valves include:

[0020] a first one-way valve disposed between the gearbox and the first end of the pump device, the first one-way valve allowing fluid to flow in a direction from the gearbox to the first end;

[0021] a second one-way valve disposed between the motor housing and the second end of the pump device, the second one-way valve allowing fluid to flow in a direction from the motor housing to the second end, the first end and the second end of the pump device being respectively connected to a heat exchanger;

[0022] a third one-way valve disposed between the second end of the pump device and the heat exchanger, the third one-way valve allowing fluid to flow in a direction from the second end to the heat exchanger;

[0023] A fourth one-way valve is arranged between the first end of the pump device and the heat exchanger, the fourth one-way valve allowing fluid to flow in a direction from the first end to the heat exchanger.

[0024] In an alternative embodiment, the pump device is a bidirectional pump including a first end and a second end, wherein the first end is alternatively connected to the gear box or the motor housing as a suction side through the valve device, and the second end is connected to the heat exchanger as a pressure side.

[0025] According to one embodiment of the present disclosure, the pump drive motor, the pump device and the valve device are simultaneously fixed to the assembly housing by means of bolts.

[0026] According to one embodiment of the present disclosure, the pump device includes a pump rotor and a pump cover, the pump drive motor drives the pump rotor using its pump motor drive shaft, and the pump cover is fixedly connected to the pump drive motor and the valve body, respectively, wherein sealing rings are arranged between the pump cover and the pump drive motor and between the pump cover and the valve body.

[0027] According to an embodiment of the present disclosure, the valve device comprises a reversing valve. Particularly preferably, the valve device comprises a solenoid valve.

[0028] The control device can directly transmit a signal for switching the reversing valve to the reversing valve, wherein the signal is based on the operating state of the vehicle, including the tilt state of the vehicle and / or the acceleration of the vehicle; optionally, the signal is based on the rotation direction of the pump drive motor.

[0029] The present invention also provides a vehicle, which comprises the transmission assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0031] Figure 1 A partial perspective view schematically shows a transmission assembly according to the present invention;

[0032] Figure 2 Schematically shown Figure 1 A partial stereoscopic view of the transmission assembly from another angle;

[0033] Figure 3 Schematically shown Figure 1 A partial perspective view of components of the transmission assembly shown;

[0034] Figure 4 Schematically shown Figure 3 A partial perspective view of the components shown;

[0035] Figure 5 Schematically shown Figure 3 Another partial perspective view of the component;

[0036] Figure 6 Schematically shown Figure 3 A partial disassembled view of the components shown;

[0037] Figure 7 Schematically shown Figure 3 a partial cross-sectional view of the component;

[0038] Figure 8 Schematically showing a circuit diagram of a transmission assembly according to a first embodiment of the present invention;

[0039] Fig. 9 Schematically shown Figure 7 The first operating state of the circuit diagram shown;

[0040] Fig.10 Schematically shown Figure 7 The second operating state of the circuit diagram shown;

[0041] Fig.11A circuit diagram schematically showing a transmission assembly according to a second embodiment of the present invention; and

[0042] Fig.12 Components of a transmission assembly according to a second embodiment of the present invention are schematically shown. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0045] Figure 1 A transmission assembly is schematically shown, which includes an assembly housing 1 and a gearbox and a motor housing (not shown in the figure) which are arranged in an integrated manner in the assembly housing 1. The transmission assembly also includes a cooling lubrication system (not shown in detail in the figure), which is arranged in the assembly housing 1. The lubricating oil flows through the gearbox and the motor housing via the lubrication system and flows into the input end of the heat exchanger 4.

[0046] When the vehicle including the transmission assembly is in a first operating condition of normal driving, the vehicle body is kept substantially horizontal, and accordingly, the liquid level of the lubricating oil is kept substantially horizontal. In this case, the suction port of the pump device for pumping the lubricating oil is submerged below the liquid level, so that the lubricating oil can be pumped normally. However, in an abnormal second operating condition, the vehicle body is tilted, and the lubricating oil moves to the motor housing side accordingly, causing the liquid level on the gear box side to drop, thereby making it impossible for the pump device to pump the lubricating oil from there with sufficient inlet pressure.

[0047] Figure 1 and Figure 2 Schematically showing the partial schematic diagram of the transmission assembly according to the first embodiment of the present invention. The transmission assembly comprises an assembly housing 1, Figure 1 and Figure 2The gearbox 2 and the motor housing 3 are not specifically shown, wherein the gearbox and the motor housing are arranged in an integrated manner in the assembly housing 1.

[0048] A module consisting of a valve device V, a pump device P and a pump drive motor M is also installed in the assembly housing 1, and the module generally has a substantially cylindrical profile. To this end, the assembly housing 1 includes an integrally formed valve interface 10, which protrudes outward from the assembly housing 1 and has a cylindrical wall adapted to the outer profile of the valve device V in the above-mentioned module, thereby forming a form-fitting connection with the valve device V. A gearbox oil hole 12 leading to the gearbox 2 is constructed at the end opening of the cylindrical wall of the valve interface 10, and a motor housing oil hole 13 leading to the motor housing 3 and a heat exchanger hole 14 leading to the heat exchanger 4 are constructed in the circumferential surface of the cylindrical wall, wherein the motor housing oil hole 13 and the heat exchanger hole 14 are arranged mutually offset in the axial direction.

[0049] The valve device V comprises a valve body 50 in which a plurality of one-way valves are arranged. Figure 6 The valve body 50 is hidden in the figure, and only four one-way valves arranged therein are schematically shown, namely, the first one-way valve V1, the second one-way valve V2, the third one-way valve V3 and the fourth one-way valve V4. A plurality of sealing devices extending in parallel to each other are arranged axially on the outer periphery of the valve device V. For example, in this embodiment, three sealing rings extending in parallel to each other are arranged, namely, the first valve sealing ring 501, the second valve sealing ring 502 and the third valve sealing ring 503. A gear box valve hole 52 which can communicate with the first one-way valve V1 is constructed on the end face of the valve body 50 facing the valve interface 10 of the assembly housing 1, a heat exchanger valve hole 54 which can communicate with the third one-way valve V3 and the fourth one-way valve V4 is constructed between the first valve sealing ring 501 and the second valve sealing ring 502, and a motor valve hole 53 which can communicate with the second one-way valve V2 is constructed between the second valve sealing ring 502 and the third valve sealing ring 503.

[0050] In this embodiment, the pump device P is constructed as a rotor pump commonly used in the prior art, which is fixedly connected to the valve device V on the one hand, and is fixedly connected to the pump drive motor M for driving the pump device P on the other hand. The pump drive motor M, the pump device P and the valve device V are fixed together on the assembly housing 1. Figures 3 to 7As shown, the pump device P includes a pump rotor 70, a pump cover 71, a first pump seal ring 504, and a second pump seal ring 505. The pump rotor is installed in the rotor cavity 70a, and is driven by the pump motor drive shaft 73 of the pump drive motor M; the pump cover 71 is fixedly connected to the pump drive motor M on one side, and the fixed connection is achieved by means of a hollow pin 72, and the pump cover 71 is fixedly connected to the valve body 50 of the valve device V on the other side. A first pump seal ring 504 is arranged between the pump cover 71 and the valve body 50, and a second pump seal ring 505 is arranged between the pump cover 71 and the pump drive motor M. As shown Figure 1 and Figure 3 As shown, the bolts 6 simultaneously fix the pump drive motor M, the pump cover 71 and the valve body 50 to the assembly housing 1 .

[0051] Figure 6 When the valve device V is installed in the valve interface 10, the gap between the circumferential surface of the valve device V and the circumferential wall of the valve interface 10 is divided into a plurality of axially parallel annular channels by the sealing ring, so that the gear box valve hole 52 is connected with the gear box oil hole 12, the motor valve hole 53 is connected with the motor housing oil hole 13, and the heat exchanger valve hole 54 is connected with the heat exchanger hole 14.

[0052] use Figure 7 The cooperation between the one-way valve and the pump device P is described as an example. The second one-way valve V2 is arranged in the valve body 50, which includes a valve core V21 configured as a ball and a spring member V22 that preloads and supports the valve core V21 in the valve body 50. The valve body 50 leads to the motor valve hole 53 on the circumferential surface on the side of the valve core V21 that faces away from the spring member V22, and extends to the side of the motor valve hole 53 to form a first passage L1 and a second passage L2 that are connected to the second end of the pump device P. When the pump device P runs in the first direction R1 under the action of the pump drive motor M, the second end of the pump device is the pressure side, and the first passage L1 and the second passage L2 have positive pressure, so that the valve core V21 closes the motor valve hole 53. When the pump device P runs in the second direction R2 opposite to the first direction R1 under the action of the pump drive motor M, the second end of the pump device becomes the suction side, and the first passage L1 and the second passage L2 have negative pressure. The valve core V21 accordingly overcomes the preload force of the spring member V22 and presses downward, releasing the line between the first passage L1 and the motor valve hole 53, thereby allowing the lubricating oil at the motor housing 3 to be sucked into the pump device P.

[0053] pass Figures 8 to 10 A circuit diagram of a transmission assembly according to a first embodiment of the present invention is schematically shown.

[0054] like Figure 8As shown, the pump device P includes a first end P1 and a second end P2, wherein the first end P1 of the pump device P is connected to the gear box 2 and the heat exchanger 4 respectively, and the second end P2 of the pump device P is connected to the motor housing 3 and the heat exchanger 4. A first one-way valve V1 is provided between the first end P1 of the pump device P and the gear box 2, and a fourth one-way valve V4 is provided between the first end P1 and the heat exchanger 4. A third one-way valve V3 is provided between the second end P2 of the pump device P and the motor housing 3, and a third one-way valve P3 is provided between the second end P2 and the heat exchanger 4. As shown in FIG. Figure 8 As shown, the first one-way valve V1 allows fluid to flow from the gearbox 2 to the first end P1, the second one-way valve V2 allows fluid to flow from the motor housing 3 to the second end P2, the third one-way valve V3 allows fluid to flow from the first end P1 to the heat exchanger 4, and the fourth one-way valve V4 allows fluid to flow from the second end P2 to the heat exchanger 4.

[0055] The pump device P4 can be operated in a first direction R1 and a second direction R2 opposite to the first direction R1 by the pump drive motor M. The operating direction of the pump drive motor M can be controlled by a control device not shown in the figure, wherein the control device controls the operating direction of the pump drive motor M based on a sensor signal generated by a sensor device regarding the operating state of the vehicle, such as the tilt state and / or acceleration direction of the vehicle, or according to the current intensity of the pump drive motor M.

[0056] like Fig. 9 As shown, under the normal first working condition, the body of the vehicle is basically kept horizontal, and the lubricating oil level is sufficiently high at the gear box 2. The pump device P operates normally along the first direction R1 under the drive of the pump drive motor M, wherein the first end P1 of the pump device P is the suction side and the second end P2 is the pressure side. In this case, the first one-way valve V1 is opened, the second one-way valve V2 is closed, the third one-way valve V3 is opened, and the fourth one-way valve V4 is closed, thereby releasing the first fluid channel S1 connecting the gear box 2 and the heat exchanger 4. At this time, the pump device P uses the first end P1 as the suction side to suck the lubricating oil from the gear box 2, and then transports it to the heat exchanger 4 through the first fluid channel S1.

[0057] like Fig.10As shown, under the abnormal second working condition, the vehicle body tilts and the lubricating oil flows into the motor housing 3. The control device controls the pump device P to operate in the second direction R2 opposite to the first direction R1 based on the sensor signal generated by the sensor device for detecting the tilt state and / or acceleration of the vehicle, or according to the current intensity of the pump drive motor M. At this time, the second end P2 of the pump device P is the suction side, and the first end P1 is the pressure side. In this case, the second one-way valve V2 is opened, the first one-way valve V1 is closed, the fourth one-way valve V4 is opened, and the third one-way valve V3 is closed, thereby releasing the second fluid channel S2 connecting the motor housing 3 and the heat exchanger 4. At this time, the pump device P uses the second end P2 as the suction side to suck the lubricating oil from the motor housing 3, and then transports it to the heat exchanger 4 through the second fluid channel S2.

[0058] Fig.11 and Fig.12 A transmission assembly according to a second embodiment of the present invention is schematically shown.

[0059] Different from the first embodiment described above, the pump device P is configured as a bidirectional pump, which includes a first end P1 as a suction side and a second end P2 as a pressure side. The valve device V includes a reversing valve, preferably a solenoid valve. The gear box 2 and the motor housing 3 are selectively connected to the first end P1 of the pump device P by means of the valve device P configured as a reversing valve, and the second end P2 of the pump device P is connected to the heat exchanger 4. By moving the reversing valve, the gear box 2 or the motor housing 3 can be selectively connected to the first end P1 of the pump device P.

[0060] Fig.11 The schematic diagram shows the transmission assembly in the first working condition of normal operation. By releasing the first fluid channel S1 connecting the gear box 2 and the heat exchanger 4 with the reversing valve, the pump device P sucks the lubricating oil from the gear box 2 and delivers it to the heat exchanger 4 through the first fluid channel S1. Fig.12 As shown, the valve core releases the passage connected to the gear box 2 and closes the passage connected to the motor housing 3.

[0061] When the vehicle is in an abnormal second operating condition, the control device causes the reversing valve to shift with the help of the sensor device and / or the current intensity of the pump drive motor, thereby releasing the second fluid channel S2 connecting the motor housing 3 and the heat exchanger 4, and the pump device P draws lubricating oil from the motor housing 3 and transports it to the heat exchanger 4 through the second fluid channel S2.

[0062] According to another aspect of the present disclosure, a vehicle is provided, which includes the electric drive assembly system as described above. The vehicle may be an electrified vehicle, such as a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), an extended range electric vehicle (Range extended EV), or a fuel cell vehicle (FCEV). The vehicle may also be a hydrogen energy vehicle.

[0063] Certain features, structures or characteristics in one or more embodiments of the present application may be appropriately combined.

[0064] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0065] The above is an explanation of the present invention and should not be considered as a limitation thereof. Although several exemplary embodiments of the present invention have been described, it will be readily appreciated by those skilled in the art that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present invention. Therefore, all of these modifications are intended to be included within the scope of the present invention as defined in the claims. It should be understood that the above is an explanation of the present invention and the present invention should not be considered to be limited to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the present invention.

[0066] List of Reference Numerals

[0067] 1 Assembly housing

[0068] 10 Valve interface

[0069] 12 Gearbox oil hole

[0070] 13 Motor housing oil hole

[0071] 14 Heat exchanger holes

[0072] 2 Gearbox

[0073] 3 Motor housing

[0074] 4 Heat exchanger

[0075] V valve device

[0076] V1 First check valve

[0077] V2 Second check valve

[0078] V3 Third check valve

[0079] V4 Fourth check valve

[0080] 50 Valve body

[0081] 501 First valve sealing ring

[0082] 502 Second valve sealing ring

[0083] 503 Third valve sealing ring

[0084] 52 Gear box valve hole

[0085] 53 Motor valve hole

[0086] 54 Heat exchanger valve hole

[0087] 6 Bolts

[0088] 70 Pump rotor

[0089] 701 First pump seal ring

[0090] 702 Second pump seal ring

[0091] 70a Rotor chamber

[0092] 71 Pump cover

[0093] 72 Hollow Pin

[0094] 73 Pump motor drive shaft.

Claims

1. A transmission assembly for a vehicle, comprising: Assembly housing (1); A gear box (2) and a motor housing (3) are arranged integrally in the assembly housing (1); Heat exchanger (4); and a cooling and lubricating system, wherein the cooling and lubricating system is arranged in the assembly housing (1), Characterized in that the cooling and lubrication system comprises: A first fluid passage (S1) between the gear box (2) and the heat exchanger (4), a second fluid passage (S2) between the motor housing (3) and the heat exchanger (4), and Pump device (P), The lubricating medium can selectively connect the first fluid channel (S1) or the second fluid channel (S2) by means of the pump device (P), thereby selectively flowing into the gear box (2) or the motor housing (3) and being sent to the heat exchanger (4).

2. The transmission assembly according to claim 1, characterized in that: The transmission assembly comprises a valve device (V), wherein the valve device (V) comprises a valve body (50), and the valve device (V) is used to switch the first fluid channel (S1) and the second fluid channel (S2), wherein the first fluid channel (S1) is connected to a gear box (2) connected to the suction side of the pump device (P) and a heat exchanger (4) connected to the pressure side of the pump device (P); and the second fluid channel (S2) is connected to a motor housing (3) connected to the suction side of the pump device (P) and a heat exchanger (4) connected to the pressure side of the pump device (P).

3. The transmission assembly according to claim 2, characterized in that: The pump device (P) is a bidirectional reversible suction pump, comprising a first end (P1) and a second end (P2). When the pump device (P) operates in a first direction, the first end (P1) is a suction side and the second end (P2) is a pressure side; when the pump device (P) operates in a second direction opposite to the first direction, the second end (P2) is the suction side and the first end (P1) is a pressure side.

4. The transmission assembly according to claim 3, characterized in that: The transmission assembly comprises a sensor device for detecting the running state of the vehicle, wherein the pump device (P) is controlled to run in the first direction or the second direction by means of a sensor signal generated by the sensor device.

5. The transmission assembly according to claim 4, characterized in that: The running state of the vehicle includes a tilt state of the vehicle and / or an acceleration of the vehicle.

6. The transmission assembly according to claim 3, characterized in that: The transmission assembly comprises a pump drive motor (M) for driving the pump device to operate, and the pump device (P) is controlled to operate in the first direction or the second direction according to the rotation direction of the pump drive motor (M).

7. The transmission assembly according to claim 3, characterized in that: The valve device (V) comprises a plurality of one-way valves.

8. The transmission assembly according to claim 7, characterized in that: The plurality of one-way valves have a common valve body (50).

9. The transmission assembly according to claim 7, characterized in that: The plurality of one-way valves include: a first non-return valve (V1) arranged between the gearbox (2) and the first end (P1) of the pump device (P), the first non-return valve (V1) allowing fluid to flow in a direction from the gearbox (2) to the first end (P1); a second one-way valve (V2) arranged between the motor housing (3) and the second end (P2) of the pump device (P), the second one-way valve (V2) allowing fluid to flow in a direction from the motor housing (3) to the second end (P2), the first end (P1) and the second end (P2) of the pump device (P) being respectively connected to a heat exchanger (4); a third non-return valve (V3) arranged between the second end (P2) of the pump device (P2) and the heat exchanger (4), the third non-return valve (V3) allowing fluid to flow in a direction from the second end (P2) to the heat exchanger (4); and A fourth non-return valve (V4) is arranged between the first end (P1) of the pump device (P) and the heat exchanger (4), and the fourth non-return valve (V4) allows fluid to flow in a direction from the first end (P1) to the heat exchanger (4).

10. The transmission assembly according to claim 2, characterized in that: The pump device (P) is a bidirectional pump, comprising a first end (P1) and a second end (P2). The first end (P1) is selectively connected to the gear box (2) or the motor housing (3) as a suction side through the valve device, and the second end (P2) is connected to the heat exchanger (4) as a pressure side.

11. The transmission assembly according to claim 10, characterized in that: The pump drive motor (M), the pump device (P) and the valve device (V) are fixed to the assembly housing (1) at the same time by means of bolts (6).

12. The transmission assembly according to claim 11, characterized in that: The pump device (P) comprises a pump rotor (70) and a pump cover (71); the pump drive motor (M) drives the pump rotor (70) by means of its pump motor drive shaft (73); the pump cover (71) is fixedly connected to the pump drive motor (M) and the valve body (50), respectively; wherein sealing rings are arranged between the pump cover (71) and the pump drive motor (M) and between the pump cover (71) and the valve body (50).

13. The transmission assembly according to claim 10, characterized in that: The valve device comprises a reversing valve.

14. A vehicle comprising the transmission assembly according to any one of claims 1 to 13.

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