Speed reducer shell assembly, speed reducer and vehicle

Abstract

The utility model provides a decelerator housing assembly, decelerator and vehicle, the decelerator housing assembly comprises a housing unit, a liquid inlet part and a liquid outlet part, the housing unit is provided with a transmission cavity and a liquid cooling cavity which are not communicated with each other, the housing unit also comprises a partition wall and a heat conduction part arranged on the inner wall of the liquid cooling cavity, the liquid cooling cavity is located on one side of the partition wall and divided into a plurality of liquid cooling flow channels through heat conduction, the transmission cavity comprises an oil storage cavity formed by the other side, away from the liquid cooling cavity, of the partition wall, and the liquid storage and inlet part is arranged in the shell unit and provided with liquid inlet channels communicating with the liquid cooling flow channels. The liquid outlet part is arranged on the shell unit and is provided with a liquid outlet channel communicated with each liquid cooling flow channel.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, in particular to a speed reducer housing assembly, a speed reducer and a vehicle. Background Art

[0002] The electric drive assembly of a new energy vehicle includes a drive motor and a speed reducer. During the operation of the electric drive assembly, a large amount of heat is generated inside the speed reducer. Therefore, the cooling and lubrication of the speed reducer are crucial. Using lubricating oil to lubricate the differential, gear set, etc. inside the speed reducer can not only improve the meshing and transmission smoothness between the differential and the gear set, but also cool the differential and the gear set through the lubricating oil. In order to achieve long-term lubrication and cooling of the differential and the gear set, it is also necessary to cool the lubricating oil in time to reduce the oil temperature of the lubricating oil to maintain the stability of the physical and chemical properties of the lubricating oil. Summary of the Utility Model

[0003] In view of this, the utility model provides a speed reducer housing assembly, a speed reducer and a vehicle, aiming to timely and effectively reduce the oil temperature of the lubricating oil in the speed reducer, so as to maintain the stability of the physical and chemical properties and efficacy of the lubricating oil, and ensure that the inside of the speed reducer can be effectively lubricated and cooled.

[0004] The speed reducer housing assembly of the utility model includes a housing unit, a liquid inlet part and a liquid outlet part. The housing unit is configured with a non-communicating transmission cavity and a liquid cooling cavity, and further includes a partition wall and a heat conduction part arranged on the inner wall of the liquid cooling cavity. The liquid cooling cavity is located on one side of the partition wall and is divided into a plurality of liquid cooling channels by the heat conduction part. The transmission cavity includes an oil storage cavity located on the other side of the partition wall. The oil storage cavity is formed by the other side of the partition wall away from the liquid cooling cavity. The liquid inlet part is arranged on the housing unit and is configured with a liquid inlet channel communicating with each liquid cooling channel. The liquid outlet part is arranged on the housing unit and is configured with a liquid outlet channel communicating with each liquid cooling channel.

[0005] In some embodiments, the heat conduction part includes a plurality of heat conduction convex pins, and the plurality of heat conduction convex pins protrude from the side of the partition wall facing away from the oil storage cavity at intervals, and the plurality of liquid cooling channels communicate with each other.

[0006] In some embodiments, the heat conduction convex pin is a cylindrical structure; and / or, the heat conduction convex pin is integrally connected with the partition wall.

[0007] In some embodiments, the housing unit further includes a flange part and a cold cavity cover. The flange part protrudes from the side of the partition wall facing away from the oil storage cavity, and the cold cavity cover is covered on the flange part. The cold cavity cover, the flange part and the partition wall enclose to form a liquid cooling cavity.

[0008] In some embodiments, the flange part is provided with a liquid inlet socket and a liquid outlet socket. The liquid inlet part is inserted into the liquid inlet socket and is hermetically connected with the liquid inlet socket. The liquid outlet part is inserted into the liquid outlet socket and is hermetically connected with the liquid outlet socket.

[0009] In some embodiments, the flange portion is integrally connected to the partition wall; and / or, the cold cavity cover is fixedly welded to the flange portion.

[0010] In some embodiments, a plurality of heat conducting ribs are provided on a side of the partition wall facing away from the liquid cooling cavity. The housing unit further includes a gear connecting portion for coaxially connecting a differential gear. The partition wall extends circumferentially along the gear connecting portion, and the plurality of heat conducting ribs are arranged one by one along the circumferential direction of the gear connecting portion.

[0011] In some embodiments, the vertical height of the liquid inlet passage is not higher than the vertical height of the liquid outlet passage.

[0012] The speed reducer of the present utility model includes a gear set, a differential, and a speed reducer housing assembly. The gear set is connected to the differential, and both the gear set and the differential are rotatably disposed in a transmission cavity. At least a part of the gear set and / or at least a part of the differential is located in an oil storage cavity.

[0013] The vehicle of the present utility model includes a first liquid pipe, a second liquid pipe, a coolant tank, and a speed reducer. The first liquid pipe connects the liquid outlet end of the coolant tank to the liquid inlet portion, and the second liquid pipe connects the liquid return end of the coolant tank to the liquid outlet portion.

[0014] Compared with the prior art, the beneficial effects of the present utility model include:

[0015] 1) When the liquid inlet portion is connected to the liquid outlet end of the coolant tank and the liquid outlet portion is connected to the liquid return end of the coolant tank, a cooling circulation loop is established between the liquid cooling cavity and the coolant tank, and a heat conduction path passing through the oil storage cavity - partition wall - liquid cooling flow channel in sequence is established in the speed reducer housing assembly. The heat in the lubricating oil is conducted from the oil storage cavity to the coolant in the liquid cooling cavity through the above heat conduction path, and then enters the cooling circulation loop to be dissipated. Therefore, the oil temperature of the lubricating oil in the speed reducer can be reduced to prevent the physical and chemical properties and efficacy of the lubricating oil from changing due to overheating, and effective lubrication and cooling inside the speed reducer are ensured.

[0016] 2) The arrangement of the heat conducting portion increases the contact area between the coolant in the liquid cooling cavity and the housing unit, thereby increasing the heat conduction area for heat transfer from the partition wall to the liquid cooling flow channel. The rate of heat conduction from the lubricating oil to the coolant is significantly increased, and the oil temperature of the lubricating oil can be effectively reduced in a timely manner, enabling the lubricating oil to be quickly cooled in a shorter time for repeated lubrication of the differential and gear set in the speed reducer.

[0017] 3) The heat transfer part can divert the coolant in the liquid cooling cavity. The coolant is dispersed into multiple cooling branches by the heat transfer part. The multiple cooling branches flow along different liquid cooling channels respectively, which significantly increases the contact area between the coolant and the inner wall of the liquid cooling cavity, and correspondingly improves the utilization rate of the coolant. It only needs to inject a small amount of coolant into the liquid cooling cavity to make the coolant diffuse over a large area, so that the coolant can fully absorb the heat of the partition wall to accelerate the rate of heat conduction from the lubricating oil to the partition wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a partial structural schematic diagram of a reducer housing assembly according to an embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of a reducer housing assembly according to one embodiment of the utility model;

[0020] Figure 3 This is a partial structural schematic diagram of a reducer housing assembly according to an embodiment of the utility model;

[0021] Figure 4 for Figure 3 The schematic diagram of the structure of the reducer housing assembly after the cold chamber cover is removed;

[0022] Figure 5 for Figure 3 The cross-sectional view of the reducer housing assembly shown is obtained by cutting along the AA plane;

[0023] Figure 6 It is a partial structural exploded view of a reducer housing assembly according to one embodiment of the utility model.

[0024] Explanation of the reference numerals: 10, housing unit; 11, main housing; 111, partition wall; 112, transmission chamber; 1121, oil storage chamber; 113, liquid cooling chamber; 114, flange portion; 1141, liquid inlet socket; 1142, liquid outlet socket; 115, heat-conducting protruding pin; 116, heat-conducting rib; 117, gear connecting portion; 12, cold chamber cover; 21, liquid inlet portion; 211, liquid inlet channel; 22, liquid outlet portion; 221, liquid outlet channel; 31, first sealing ring; 32, second sealing ring; 41, first fastener; 42, second fastener. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0027] The present utility model provides a reducer housing assembly, a reducer including the reducer housing assembly, and also provides a vehicle. The reducer and the drive motor are combined and used as the electric drive assembly of the vehicle. Refer to Figures 1 to 2 、 Figure 6 , the reducer housing assembly includes a housing unit 10, the housing unit 10 includes a main housing 11 configured with a transmission cavity 112, the reducer further includes a differential and a gear set, the differential and the gear set are rotatably installed in the transmission cavity 112, the differential is used to connect the drive wheels of the vehicle and output power to the drive wheels, the gear set connects the differential and the drive motor, and the power generated by the drive motor is transmitted to the gear set and then transmitted to the differential. Through the speed reduction and torque increase effect of the reducer, the rotational speed of the drive wheels is lower than that of the drive motor, and the torque of the drive wheels is larger than the output torque of the drive motor.

[0028] Specifically, the differential includes a differential housing and differential gears fixedly connected, and the differential gears mesh with the gear set. Refer to Figures 1 to 2 、 Figure 6 , the main housing 11 includes a gear connection portion 117, the gear connection portion 117 is configured with a cylindrical surface for forming a coaxial rotational connection with the differential gears, and the axis of the cylindrical surface coincides with the axis of the differential gears and serves as the rotation center when the differential gears rotate.

[0029] Furthermore, the main housing 11 further includes a partition wall 111, and is also configured with a liquid cooling cavity 113 for collecting and storing coolant. The liquid cooling cavity 113 and the transmission cavity 112 are separated by the partition wall 111 and do not communicate with each other to ensure that the coolant in the liquid cooling cavity 113 does not enter the transmission cavity 112. Refer to Figure 1, specifically, the transmission cavity 112 includes an oil storage cavity 1121 located on one side of the partition wall 111, and the liquid cooling cavity 113 is located on the other side of the partition wall 111. The side of the partition wall 111 facing away from the liquid cooling cavity 113 encloses to form the oil storage cavity 1121 and directly serves as the inner wall of the oil storage cavity 1121. The side of the partition wall 111 facing away from the oil storage cavity 1121 is used to form the liquid cooling cavity 113 and directly serves as the bottom wall of the liquid cooling cavity 113. After the reducer is connected to the drive motor to form an electric drive assembly and the electric drive assembly is installed in the vehicle, the oil storage cavity 1121 is the part of the transmission cavity 112 relatively close to the ground, and the liquid cooling cavity 113 is located below the oil storage cavity 1121.

[0030] The oil storage cavity 1121 is used to store lubricating oil, and the oil storage cavity 1121 is also used to accommodate at least part of the gear set and / or at least part of the differential. Therefore, when the gear set and / or the differential gears rotate, they can pass through the oil storage cavity 1121 to pick up a part of the lubricating oil. For example, when the electric drive assembly operates, the drive motor drives the differential gears to rotate through the gear set. The tooth rotation trajectory of the differential gears passes through the oil storage cavity 1121 and stirs the lubricating oil, and the lubricating oil splashes in the transmission cavity 112 to lubricate the gear set and the differential. Figure 1 Schematically shows the positional relationship between the oil storage cavity 1121 and the entire transmission cavity 112. The horizontal dotted line H represents the oil level of the lubricating oil in the oil storage cavity 1121 in a static state. A part of the differential gears is located below the horizontal dotted line H and thus immersed in the lubricating oil in the oil storage cavity 1121. Optionally, as Figure 1 shown, the partition wall 111 is an arc-shaped shell wall approximately extending along the circumferential direction of the gear connection part 117. The circumferential direction of the gear connection part 117 is the circumferential direction of the rotation center of the differential gears. In other embodiments, the partition wall 111 does not have to be an arc-shaped shell wall extending along the circumferential direction of the gear connection part 117.

[0031] The reducer housing assembly of the present invention further includes a liquid inlet part 21 and a liquid outlet part 22. The liquid inlet part 21 is provided on the main housing 11 and is configured with a liquid inlet channel 211. The liquid outlet part 22 is provided on the main housing 11 and is configured with a liquid outlet channel 221. Both the liquid inlet channel 211 and the liquid outlet channel 221 communicate with the liquid cooling cavity 113. The vehicle of the present invention further includes a first liquid pipe, a second liquid pipe and a coolant tank. The first liquid pipe connects the liquid outlet end of the coolant tank and the liquid inlet part 21 so that the coolant in the coolant tank can enter the liquid cooling cavity 113 through the first liquid pipe and the liquid inlet part 21. The second liquid pipe connects the liquid return end of the coolant tank and the liquid outlet part 22 so that the coolant in the liquid cooling cavity 113 can enter the coolant tank through the liquid outlet part 22 and the second liquid pipe. Refer to Figure 3 and Figure 5, in some embodiments, the liquid inlet part 21 and the liquid outlet part 22 are respectively fixedly connected to the main housing 11 through the first fastener 41 and the second fastener 42. One end of the liquid inlet part 21 extends into the liquid cooling cavity 113, and the other end extends out of the main housing 11 to connect to the first liquid pipe. One end of the liquid outlet part 22 extends into the liquid cooling cavity 113, and the other end extends out of the main housing 11 to connect to the second liquid pipe. The liquid inlet channel 211 runs through both ends of the liquid inlet part 21, and the liquid outlet channel 221 runs through both ends of the liquid outlet part 22.

[0032] Optionally, as Figure 5 shown, in some embodiments, the reducer housing assembly further includes a first sealing ring 31 and a second sealing ring 32. The main housing 11 is further provided with a liquid inlet socket 1141 and a liquid outlet socket 1142. The liquid inlet part 21 is inserted into the liquid inlet socket 1141 so that one end of the liquid inlet part 21 extends into the liquid cooling cavity 113. The liquid outlet part 22 is inserted into the liquid outlet socket 1142 so that one end of the liquid outlet part 22 extends into the liquid cooling cavity 113. The first sealing ring 31 is sleeved on the outer peripheral wall of the liquid inlet part 21, and the inner wall of the liquid inlet socket 1141 is sealingly adapted to the outer peripheral side of the first sealing ring 31. The second sealing ring 32 is sleeved on the outer peripheral wall of the liquid outlet part 22, and the inner wall of the liquid outlet socket 1142 is sealingly adapted to the outer peripheral side of the second sealing ring 32. Thus, a sealed connection is established between the liquid inlet part 21 and the liquid inlet socket 1141, and a sealed connection is established between the liquid outlet part 22 and the liquid outlet socket 1142, improving the airtightness of the liquid cooling cavity 113 to ensure that the coolant does not overflow or leak from the liquid cooling cavity 113. It can be understood that in other embodiments, a sealed connection can also be established between the liquid inlet part 21 and the liquid inlet socket 1141, and between the liquid outlet part 22 and the liquid outlet socket 1142 by bonding.

[0033] The coolant tank, the first liquid pipe, the liquid cooling cavity 113 and the second liquid pipe establish a cooling circulation loop for the coolant to circulate. A heat conduction path that sequentially passes through the oil storage cavity 1121 - the partition wall 111 - the liquid cooling cavity 113 is established within the reducer housing assembly. The coolant in the liquid cooling cavity 113 can, on the one hand, cool the housing unit 10. On the other hand, the heat of the lubricating oil in the oil storage cavity 1121 can be conducted through the partition wall 111 to the coolant in the liquid cooling cavity 113, and then this heat enters the cooling circulation loop and is finally dissipated. Therefore, the coolant in the liquid cooling cavity 113 can also cool the lubricating oil in the reducer to prevent the lubricating oil from continuously absorbing heat and overheating, ensuring that the physical and chemical properties and lubricating efficacy of the lubricating oil do not show abnormalities, and the lubricating oil can maintain good viscosity performance, thereby ensuring that the differential and the gear set can be effectively lubricated and cooled.

[0034] Further, in some embodiments, the main housing 11 further includes a plurality of heat conducting ribs 116. The plurality of heat conducting ribs 116 protrude from the side of the partition wall 111 facing away from the liquid cooling chamber 113. The heat conducting ribs 116 and the side of the partition wall 111 facing away from the liquid cooling chamber 113 together serve as the inner wall surface of the oil storage chamber 1121, which can significantly increase the contact area between the lubricating oil in the oil storage chamber 1121 and the main housing 11. After the lubricating oil cools down the gear set and the differential, the lubricating oil returning to the oil storage chamber 1121 can conduct the heat of the lubricating oil to the partition wall 111 by contacting the inner wall surface of the oil storage chamber 1121, and then conduct it from the partition wall 111 to the coolant in the liquid cooling chamber 113. Thus, the coolant cools down the lubricating oil. The arrangement of the heat conducting ribs 116 significantly speeds up the heat transfer rate of the lubricating oil to the main housing 11, which helps the lubricating oil to cool down quickly.

[0035] Optionally, referring to Figure 1 and Figure 5 , the partition wall 111 extends along the circumferential direction of the gear connection portion 117, and the plurality of heat conducting ribs 116 are arranged one by one along the circumferential direction of the gear connection portion 117, so as to form an arc-shaped heat conducting queue extending along the circumferential direction of the gear connection portion 117. With such an arrangement, when the differential gear rotates and stirs the lubricating oil in the oil storage chamber 1121, the heat conducting ribs 116 and the side of the partition wall 111 facing away from the liquid cooling chamber 113 form an inner wall surface similar to a wave shape. The heat conducting ribs 116 play a sufficient role in stirring and decelerating the lubricating oil. Even if the rotational speed of the differential gear is relatively high, more lubricating oil can be retained in the oil storage chamber 1121. The retention of the lubricating oil in the oil storage chamber 1121 helps to maintain the scale of the heat conduction of the lubricating oil heat to the partition wall 111 and the liquid cooling chamber 113, so as to obtain a better lubricating oil cooling effect.

[0036] Optionally, in some embodiments, the heat conducting ribs 116 are integrally connected to the partition wall 111, and the heat conducting ribs 116 and the partition wall 111 are of an integrally cast structure. In other embodiments, the heat conducting ribs 116 and the partition wall 111 can also be separately formed and then fixedly connected by means of welding, plug-in connection, etc.

[0037] The reducer housing assembly of the present utility model is further defined as follows: a heat conducting portion is provided on the inner wall of the liquid cooling cavity 113. The heat conducting portion divides the liquid cooling cavity 113 into a plurality of liquid cooling channels. The liquid inlet channel 211 of the liquid inlet portion 21 is communicated with each liquid cooling channel, and the liquid outlet channel 221 of the liquid outlet portion 22 is communicated with each liquid cooling channel. With such a setting, the surface of the heat conducting portion serves as the newly added inner wall surface of the liquid cooling cavity 113, which is equivalent to an increase in the total inner wall surface area of the liquid cooling cavity 113, thereby increasing the heat conduction area for heat to transfer from the partition wall 111 to the coolant. The rate of heat conduction from the heat in the lubricating oil and the main housing 11 to the coolant is significantly improved, and the oil temperature of the lubricating oil and the temperature of the main housing 11 can be reduced in a timely and substantial manner, enabling the lubricating oil to be quickly cooled in a shorter time for repeated lubrication of the differential and the gear set. In addition, the heat conducting portion plays a role in diverting the coolant in the liquid cooling cavity 113. The coolant is dispersed by the heat conducting portion into multiple cooling branches flowing along different liquid cooling channels. By injecting an appropriate small amount of coolant into the liquid cooling cavity 113, large-area diffusion and spread of the coolant on the side of the partition wall 111 away from the oil storage cavity 1121 can be achieved.

[0038] In some embodiments, the heat conducting portion includes a plurality of heat conducting convex pins 115. The plurality of heat conducting convex pins 115 protrude from the side of the partition wall 111 away from the oil storage cavity 1121, and the plurality of heat conducting convex pins 115 are spaced apart from each other. Refer to Figures 4 to 6 , the plurality of heat conducting convex pins 115 are all of a cylindrical structure. The cylindrical outer peripheral wall of the heat conducting convex pin 115 helps to reduce the resistance when the coolant flows through. No matter from which direction the inner wall surface of the heat conducting convex pin 115 is flowed through, the resistance of the heat conducting convex pin 115 acting on the cooling branch is basically approximately equal, which helps the coolant to spread over a large area on the side of the partition wall 111 away from the oil storage cavity 1121. The plurality of heat conducting convex pins 115 are distributed approximately in a uniformly dispersed manner. The liquid cooling channels are formed between the outer peripheral walls of the plurality of different heat conducting convex pins 115. The coolant in the liquid cooling cavity 113 flows through the gaps between the outer peripheral walls of the plurality of different heat conducting convex pins 115. The coolant randomly passes through some of the liquid cooling channels. After each injection of coolant into the liquid cooling cavity 113, the diffusion and spread path of the coolant is random and arbitrary. In other words, the coolant does not always flow along certain specific liquid cooling channels. After the heat is conducted from the lubricating oil to the partition wall 111, it can be further transferred to the heat conducting convex pins 115. The coolant absorbs the heat accumulated in the heat conducting convex pins 115 while flowing through the outer peripheral wall of the heat conducting convex pins 115. It can be understood that in other embodiments, the cylindrical heat conducting convex pins 115 can also be replaced with heat conducting fins having a flat structure.

[0039] Optionally, in some embodiments, the heat-conducting convex pins 115 are integrally connected to the partition wall 111, and the heat-conducting convex pins 115 and the partition wall 111 are integrally cast structures. In other embodiments, the heat-conducting convex pins 115 and the partition wall 111 can also be separately formed and then fixedly connected by means such as welding and plug-in connection.

[0040] Further, in some embodiments, the main housing 11 further includes a flange portion 114, and the housing unit 10 further includes a cold cavity cover 12. The flange portion 114 is a closed-loop housing wall, and the flange portion 114 protrudes outward from the side of the partition wall 111 facing away from the oil storage cavity 1121. The cold cavity cover 12 is disposed on one end of the flange portion 114 opposite to the partition wall 111. Thus, the flange portion 114, the partition wall 111, and the cold cavity cover 12 jointly enclose a liquid cooling cavity 113. Refer to Figure 2 、 Figures 5 to 6 , the flange portion 114 serves as the side wall of the liquid cooling cavity 113, the side of the partition wall 111 facing away from the oil storage cavity 1121 forms the top wall of the liquid cooling cavity 113, and the side of the cold cavity cover 12 facing the partition wall 111 forms the bottom wall of the liquid cooling cavity 113. The liquid inlet socket 1141 for the liquid inlet portion 21 to be inserted therein is opened on the flange portion 114, and the liquid outlet socket 1142 for the liquid outlet portion 22 to be inserted therein is opened on the flange portion 114. The cold cavity cover 12 and the flange portion 114 are fixedly connected by welding. The specific welding method can be friction welding, laser welding, etc. The flange portion 114 and the partition wall 111 are integrally connected, and the flange portion 114 and the partition wall 111 are integrally cast structures. It can be understood that in other embodiments, the cold cavity cover 12 and the flange portion 114 can also be adhesively connected to form a sealed connection, and the flange portion 114 and the partition wall 111 can also be separately formed and then welded and fixed.

[0041] Optionally, in an embodiment of the present invention, the main housing 11 including the partition wall 111, the flange portion 114, the heat-conducting ribs 116, the heat-conducting portion, and the gear connection portion 117 is an integrally die-cast structure.

[0042] Refer to Figures 5 to 6, in some embodiments, in the vertical orientation, one end of the liquid cooling cavity 113 communicating with the liquid inlet socket 1141 is lower than the end of the liquid cooling cavity 113 communicating with the liquid outlet socket 1142, and the height of the liquid inlet channel 211 is lower than the height of the liquid outlet channel 221. In the natural state, the fluid injected into the liquid cooling cavity 113 has gravitational potential energy to flow away from the liquid outlet socket 1142 and towards the liquid inlet socket 1141. When the liquid inlet part 21 and the liquid outlet part 22 are respectively connected to the first liquid pipe and the second liquid pipe, the liquid level height of the coolant in the liquid cooling cavity 113 gradually rises until the liquid level height reaches the height of the liquid outlet channel 221. Eventually, it can be realized that the coolant occupies most of the space in the liquid cooling cavity 113, and even fills the liquid cooling cavity 113. In other embodiments, the height of the liquid inlet channel 211 can also be equivalent to the height of the liquid outlet channel 221.

[0043] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0044] Those of ordinary skill in the art of this technology should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. As long as it is within the scope of the substantial spirit of the present invention, appropriate changes and variations made to the above embodiments fall within the scope of protection required by the present invention.

Claims

1. A reducer housing assembly, characterized in that: The invention comprises a housing unit (10), a liquid inlet portion (21) and a liquid outlet portion (22); the housing unit (10) is configured with a transmission chamber (112) and a liquid cooling chamber (113) which are not connected to each other; the housing unit (10) further comprises a partition wall (111) and a heat conducting portion arranged on the inner wall of the liquid cooling chamber (113); the liquid cooling chamber (113) is located on one side of the partition wall (111) and is divided into a plurality of liquid cooling channels by the heat conducting portion; the transmission chamber (112) comprises an oil storage chamber (1121) formed on the other side of the partition wall (111); the liquid inlet portion (21) is arranged on the housing unit (10) and is configured with a liquid inlet channel (211) connected to each of the liquid cooling channels; the liquid outlet portion (22) is arranged on the housing unit (10) and is configured with a liquid outlet channel (221) connected to each of the liquid cooling channels.

2. The reducer housing assembly according to claim 1, characterized in that: The heat conduction part comprises a plurality of heat conduction convex needles (115), the plurality of heat conduction convex needles (115) are arranged protrudingly at intervals from each other on a side of the partition wall (111) away from the oil storage chamber (1121), and the plurality of liquid cooling channels are connected to each other.

3. The reducer housing assembly according to claim 2, characterized in that: The heat-conducting convex pin (115) is a cylindrical structure; and / or the heat-conducting convex pin (115) is integrally connected to the partition wall (111).

4. The reducer housing assembly according to claim 1, characterized in that: The housing unit (10) further comprises a flange portion (114) and a cold chamber cover (12); the flange portion (114) protrudes from a side of the partition wall (111) away from the oil storage chamber (1121); the cold chamber cover (12) is disposed on the flange portion (114); the cold chamber cover (12), the flange portion (114) and the partition wall (111) surround and form the liquid cooling chamber (113).

5. The reducer housing assembly according to claim 4, characterized in that: The flange portion (114) is provided with a liquid inlet socket (1141) and a liquid outlet socket (1142); the liquid inlet portion (21) is plugged into the liquid inlet socket (1141) and is sealedly connected to the liquid inlet socket (1141); the liquid outlet portion (22) is plugged into the liquid outlet socket (1142) and is sealedly connected to the liquid outlet socket (1142).

6. The reducer housing assembly according to claim 4, characterized in that: The flange portion (114) is integrally connected to the partition wall (111); and / or the cold chamber cover (12) is fixed to the flange portion (114) by welding.

7. The reducer housing assembly according to claim 1, characterized in that: A plurality of heat-conducting ribs (116) are provided on a side of the partition wall (111) facing away from the liquid cooling chamber (113); the housing unit (10) further comprises a gear connecting portion (117) for coaxially connecting a differential gear; the partition wall (111) extends along the circumference of the gear connecting portion (117); and the plurality of heat-conducting ribs (116) are arranged one by one along the circumference of the gear connecting portion (117).

8. The reducer housing assembly according to any one of claims 1 to 7, characterized in that: The vertical height of the liquid inlet channel (211) is not higher than the vertical height of the liquid outlet channel (221).

9. A reducer, characterized in that: It comprises a gear set, a differential and a reducer housing assembly as claimed in any one of claims 1 to 8, wherein the gear set is connected to the differential, and both the gear set and the differential are rotatably disposed in the transmission chamber (112), and at least part of the gear set and / or at least part of the differential is located in the oil storage chamber (1121).

10. A vehicle, characterized in that: It comprises a first liquid pipe, a second liquid pipe, a coolant tank and the reducer as claimed in claim 9, wherein the first liquid pipe connects the liquid outlet end of the coolant tank and the liquid inlet part (21), and the second liquid pipe connects the liquid return end of the coolant tank and the liquid outlet part (22).

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