Reducer housing and electric drive assembly

Abstract

The present invention relates to a reducer housing, the bottom of which and / or the side wall through which the lubricating oil flows are provided with a liquid-cooled heat dissipation structure, the liquid-cooled heat dissipation structure includes a coolant tank (1) and a cover plate (2), the cover plate is for sealing the coolant tank, the coolant tank is provided with a liquid inlet (3) and a liquid outlet (4) at both ends, and the bottom of the coolant tank is provided with several convex structures (5) and concave structures (6) alternately, so that the inner and outer surfaces of the bottom of the coolant tank are both wavy, in order to increase the contact area between the coolant tank and the lubricating liquid in the reducer housing. The reducer housing can realize heat exchange between the coolant and the lubricating liquid in the coolant tank, quickly carry away heat in the reducer housing, improve the heat dissipation performance of the reducer, and extend the service life of the reducer. The present invention also relates to an electric drive assembly having the reducer housing.

Description

Technical Field

[0001] [Cross - Reference to Related Applications] This application claims the priority of a Chinese utility model application filed with the Chinese Patent Office on August 3, 2021, with the application number 202121795244.5 and the application title "Reducer Housing and Electric Drive Assembly", and all of its contents are incorporated herein by reference.

[0002] The present invention belongs to the field of cooling technology for reducers, and particularly relates to a reducer housing and an electric drive assembly.

Background Art

[0003] Currently, the main cooling method for the reducer of new energy vehicles is cooling by gear oil agitation, that is, the gear agitates the lubricating oil inside the reducer housing, and along with the agitation of the gear, the lubricating oil flows to positions such as the gear and bearing, carrying away the heat generated during the operation of the reducer to achieve cooling.

[0004] Since new energy vehicles need to face more complex road conditions, the rotational speed of the motor of new energy vehicles is getting faster and faster, and the requirement for the temperature rise of the whole vehicle is also urgent accordingly. Facing the need to balance the temperature rise situation and the service life, using only the cooling method by gear oil agitation can no longer meet the vehicle development requirements of balancing high power, high torque, maximum vehicle speed and maximum service life of new energy vehicles.

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of the above problems, this application discloses a reducer housing and an electric drive assembly to solve or at least partially solve the above problems.

Means for Solving the Problems

[0006] To achieve the above object, the following technical solutions are used in the present invention.

[0007] One aspect of the present application discloses a speed reducer housing, and a liquid-cooling heat dissipation structure is provided on the bottom of the speed reducer housing and / or the side wall through which lubricating oil flows. The liquid-cooling heat dissipation structure includes a coolant tank and a cover plate. The cover plate is for sealing the coolant tank. A liquid inlet and a liquid outlet are respectively provided at both ends of the coolant tank. In order to increase the contact area between the coolant tank and the lubricating liquid in the speed reducer housing, Top in the Top inner and outer surfaces of the coolant tank are both provided with a wavy shape, and several convex structures and concave structures are alternately provided.

[0008] Furthermore, several flow guide plates vertically provided at the bottom of the coolant tank are provided on the cover plate or the side wall of the coolant tank. The position of the flow guide plate corresponds to the position of the concave structure. The flow guide plate and the convex structure cooperate to form a continuous S-shaped passage through which the coolant flows.

[0009] Furthermore, Top the wavy amplitude of the coolant tank decreases step by step from the liquid inlet to the liquid outlet.

[0010] Furthermore, the liquid-cooling heat dissipation structure is integrally formed by casting with the speed reducer housing.

[0011] Furthermore, a sealing ring is provided between the coolant tank and the cover plate.

[0012] Furthermore, the coolant tank and the cover plate are fixed by bolts / nuts or by welding.

[0013] Another aspect of the present application discloses an electric drive assembly, the electric drive assembly including a motor assembly and a speed reducer assembly, the motor assembly including a motor housing, and the speed reducer assembly including the speed reducer housing according to any one of the above items.

[0014] Furthermore, is the liquid inlet in communication with the coolant passage inside the water jacket of the motor, or is the liquid inlet connected to the outlet of the coolant passage of the motor?

[0015] Furthermore, an oil guide rib and an oil catch tank are provided in the speed reducer housing. The oil guide rib is for introducing the lubricating oil splashed by the gears of the speed reducer into the oil catch tank and the parts to be lubricated and the parts to be cooled in the speed reducer housing. The lubricating oil in the oil catch tank is conveyed through an oil passage to the parts to be lubricated and the parts to be cooled in the motor housing.

[0016] Furthermore, an oil baffle plate or an oil baffle rib is provided in the speed reducer housing.

Advantages of the Invention

[0017] The advantages and beneficial effects of the present invention are as follows.

[0018] In the speed reducer housing of the present application, a coolant tank is provided at the bottom of the speed reducer housing and / or on the side wall where the lubricating oil flows. In order to increase the contact area between the coolant tank and the lubricating liquid in the speed reducer housing, several convex structures and concave structures are alternately provided on the inner and outer surfaces of the coolant tank so that both the inner and outer surfaces are wavy, thereby realizing the heat exchange between the coolant and the lubricating liquid in the coolant tank, quickly removing the heat in the speed reducer housing, improving the heat dissipation performance of the speed reducer, and extending the service life of the speed reducer. Top in the Top coolant tank

Brief Description of the Drawings

[0019] By reading the following detailed description of the preferred embodiments, various other advantages and merits will become apparent to those skilled in the art. The drawings are merely illustrative of the preferred embodiments and should not be construed as limiting the present application. Also, throughout the drawings, the same parts are denoted by the same reference numerals.

[0020]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0021] In order to make the object, technical solution and advantages of the present application more clear, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of them. All other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present application are included in the protection scope of the present application.

[0022] Hereinafter, with reference to the drawings, the technical solutions according to the embodiments of the present invention will be described in detail.

[0023] An embodiment of the present application discloses a speed reducer housing, and a liquid cooling heat dissipation structure is provided on the bottom and / or the side wall through which lubricating oil flows of the speed reducer housing. As shown in FIGS. 1 to 2, the liquid cooling heat dissipation structure includes a coolant tank 1 and a cover plate 2. The cover plate 2 is for sealing the coolant tank 1. A liquid inlet 3 and a liquid outlet 4 are respectively provided at both ends of the coolant tank 1. Among them, the positions of the liquid inlet 3 and the liquid outlet 4 may be interchanged with each other. The liquid cooling heat dissipation structure on the speed reducer housing may be a combination of one or more structures. When there are a plurality of liquid cooling heat dissipation structures on the speed reducer housing, the plurality of liquid cooling heat dissipation structures are provided in series or in parallel.

[0024] When the liquid cooling heat dissipation structure is provided at the bottom of the speed reducer housing, in order to improve the heat dissipation performance of the speed reducer, the liquid cooling heat dissipation structure may be laid flat on the entire bottom of the speed reducer housing.

[0025] Of the coolant tank 1 Top Both the inner surface and the outer surface are provided in a wavy shape, and several convex structures 5 and concave structures 6 are alternately provided on the Top of the coolant tank 1, so that the contact area between the coolant and the Top of the coolant tank 1 is increased, heat dissipation is promoted, and the wavy amplitude is adjustable. When the outside of the Top of the coolant tank 1 comes into contact with the lubricating oil, the wavy bottom can effectively increase the contact area between the coolant tank 1 and the lubricating liquid in the speed reducer housing at the same time, and promote heat exchange. Among them, the convex structure 5 protrudes from the bottom of the coolant tank 1, and the concave structure 6 is recessed from the bottom of the coolant tank 1. Also, the depths of the convex structure 5 and the concave structure 6 can be adjusted according to the position of the gears inside the speed reducer housing.

[0026] The coolant enters the coolant tank 1 from the liquid inlet 3, and heat exchange with the lubricating oil in the speed reducer housing is realized by the convex structure 5 and the concave structure 6, and the temperature of the lubricating oil is reduced.

[0027] To sum up, in the speed reducer housing of this embodiment, a coolant tank is provided at the bottom of the speed reducer housing and / or on the side wall through which the lubricating oil flows, and in order to increase the contact area between the coolant tank and the lubricating liquid in the speed reducer housing, on the Top of the coolant tank, several convex structures and concave structures are alternately provided so that both the inner surface and the outer surface of the Top of the coolant tank are provided in a wavy shape, realizing heat exchange between the coolant and the lubricating liquid in the coolant tank, quickly removing the heat in the speed reducer housing, improving the heat dissipation performance of the speed reducer, and further extending the service life of the speed reducer.

[0028] In one embodiment, as shown in FIGS. 1 to 2, several flow guide plates 7 vertically provided at the bottom of the coolant tank 1 are provided on the side wall of the cover plate 2 or the coolant tank 1. The number of the flow guide plates 7 coincides with the number of the concave structures 6, and the position of the flow guide plate 7 corresponds to the position of the concave structure 6. The flow guide plate 7 and the convex structure 5 cooperate to form a continuous S-shaped passage through which the coolant flows, and the coolant flows in an S-shape up and down in the coolant tank 1.

[0029] In one embodiment, the Top wavy amplitude decreases step by step from the liquid inlet 3 to the liquid outlet 4, avoiding the dead angle of the coolant flow and improving the heat dissipation effect.

[0030] In one embodiment, the liquid cooling heat dissipation structure is integrally cast and formed with the speed reducer housing, making the speed reduction structure more compact and saving the manufacturing process steps. Also, the liquid cooling heat dissipation structure does not need to be finish-machined during manufacturing, causing turbulence when the coolant flows in the coolant tank, and is further beneficial for the heat exchange between the coolant and the Top coolant tank.

[0031] In one embodiment, a sealing ring for sealing between the coolant tank 1 and the cover plate 2 and preventing the outflow of the coolant is provided between the coolant tank 1 and the cover plate 2.

[0032] Furthermore, the coolant tank 1 and the cover plate 2 are fixed by bolts / nuts or by welding. Of course, the coolant tank 1 and the cover plate 2 may be fixed by other methods, and they are also within the protection scope of the present application.

[0033] One embodiment of the present application discloses an electric drive assembly, which includes a motor assembly and a speed reducer assembly. As shown in FIG. 2, the motor assembly includes a motor housing 8, and the speed reducer assembly includes a speed reducer housing in any one of the above embodiments. The electric drive assembly has excellent heat dissipation performance, can meet the working needs of long-term, high-power, high-torque, and high-rotation speed under various operating conditions, and can improve the reliability of the automotive power system and the entire vehicle.

[0034] In one embodiment, the liquid inlet 3 may be provided on the end face of the speed reducer housing connected to the motor housing 8. Through the passage provided in the motor housing, the communication between the liquid suction port 3 and the coolant passage inside the water jacket of the motor is realized. The circulating coolant directly enters the coolant tank 1 from the coolant passage of the motor through the liquid inlet 3 provided on the speed reducer housing at the joint surface.

[0035] Alternatively, a water nozzle is provided at the liquid inlet 3, and the connection between the liquid inlet 3 and the outlet of the coolant passage of the motor is realized by a coolant pipe. The circulating coolant flows out from the outlet of the coolant passage of the motor, enters the liquid inlet 3 provided on the outer wall of the coolant tank 1 through the external coolant pipe, and thus enters the coolant tank 1.

[0036] By designing the communication between the coolant tank 1 and the coolant passage of the motor, the same coolant circulation system can be shared by the speed reducer and the motor, and the heat dissipation cost of the automotive power system can be saved.

[0037] In one or some embodiments, as shown in FIG. 2, an oil guide rib 9 and an oil catch tank 10 are provided in the speed reducer housing. The oil guide rib 9 is for introducing the lubricating oil splashed by the gears of the speed reducer into the oil catch tank 10 and the parts to be lubricated and cooled in the speed reducer housing. The lubricating oil in the oil catch tank 10 is conveyed through an oil passage 11 to the parts to be lubricated and cooled in the motor housing 8, and further lubrication and cooling of the parts are realized. Among them, the parts to be cooled include bearings, gears, motor coils, motor rotors, etc., and the parts to be lubricated include bearings, gears, oil seals, etc.

[0038] In one embodiment, as shown in FIG. 2, an oil baffle plate or an oil baffle rib 12 is provided in the speed reducer housing, which can reduce the amount of lubricating oil splashed during the rotation of the gears of the speed reducer, and further reduce the power loss caused by oil agitation of the gears of the speed reducer.

[0039] The above are only specific embodiments of the present application. Under the above teachings of the present application, those skilled in the art can make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above specific description is for better interpreting the purpose of the present application, and the protection scope of the present application is based on the protection scope of the claims.

Description of Reference Numerals

[0040] 1 coolant tank, 2 cover plate, 3 liquid inlet, 4 liquid outlet, 5 convex structure, 6 concave structure, 7 deflector plate, 8 motor housing, 9 oil guide rib, 10 oil catch tank, 11 oil passage, 12 oil baffle rib.

Claims

1. A speed reducer housing, wherein a liquid cooling heat dissipation structure is provided on the bottom of the speed reducer housing and / or the side wall through which lubricating oil flows. The liquid cooling heat dissipation structure includes a coolant tank and a cover plate. The cover plate is for sealing the coolant tank. A liquid inlet and a liquid outlet are respectively provided at both ends of the coolant tank. In order to increase the contact area between the coolant tank and the lubricating liquid in the speed reducer housing, several convex structures and concave structures are alternately provided on the top of the coolant tank such that both the inner surface and the outer surface of the top of the coolant tank are wavy. A speed reducer housing, characterized in that the wavy amplitude at the top of the coolant tank decreases step by step from the liquid inlet to the liquid outlet.

2. Several flow guiding plates vertically provided at the bottom of the coolant tank are provided on the cover plate or the side wall of the coolant tank. The position of the flow guiding plate corresponds to the position of the concave structure. The flow guiding plate and the convex structure cooperate to form a continuous S-shaped passage through which the coolant flows. The speed reducer housing according to claim 1, characterized in that.

3. The liquid cooling heat dissipation structure is integrally formed by casting with the speed reducer housing. The speed reducer housing according to claim 1, characterized in that.

4. A seal ring is provided between the coolant tank and the cover plate. The speed reducer housing according to any one of claims 1 to 3, characterized in that.

5. The coolant tank and the cover plate are fixed by bolts / screws or by welding. The speed reducer housing according to claim 4, characterized in that.

6. An electric drive assembly including a motor assembly including a motor housing and a speed reducer assembly. The speed reducer assembly includes the speed reducer housing according to claim 1, characterized in that.

7. The liquid inlet communicates with the coolant passage inside the water jacket of the motor, or The liquid inlet is connected to the outlet of the coolant passage of the motor. The electric drive assembly according to claim 6, characterized in that.

8. Inside the speed reducer housing, an oil guide rib and an oil catch tank are provided. The oil guide rib is for introducing the lubricating oil splashed up by the gears of the speed reducer to the oil catch tank and the parts to be lubricated and the parts to be cooled inside the speed reducer housing. The lubricating oil in the oil catch tank is conveyed through an oil passage to the parts to be lubricated and the parts to be cooled inside the motor housing. The electric drive assembly according to claim 6, characterized in that.

9. The electric drive assembly according to any one of claims 6 to 8, characterized in that an oil baffle plate or an oil baffle rib is provided inside the speed reducer housing.

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