Speed reducer, power assembly and vehicle

Abstract

The utility model relates to a speed reducer, a power assembly and a vehicle, and relates to the technical field of vehicle power devices. The speed reducer comprises a shell, the shell comprises a first end, the first end is used for being connected with a motor shell, a backflow groove is formed in the bottom wall of the speed reducer shell, and the backflow groove extends towards the first end and penetrates through the first end. After the lubricating liquid is injected into the speed reducer to lubricate internal parts of the speed reducer, the lubricating liquid drips on the bottom wall under the action of gravity, gathers in the backflow groove in the bottom wall, flows along the extension direction of the backflow groove until flowing to the first end and flows out of the speed reducer, so that the lubricating liquid cannot be accumulated at the bottom of the speed reducer; and the lubricating liquid cannot be stirred in the running process of the speed reducer, so that the efficiency loss of the gear of the speed reducer caused by oil stirring is reduced.

Description

Technical Field

[0001] This utility model relates to the field of vehicle power unit technology, specifically to a reducer, powertrain, and vehicle. Background Art

[0002] Speed ​​reducers are generally used in high-torque transmission equipment. They achieve speed reduction by meshing a small gear on the input shaft with a large gear on the output shaft. During operation, the gears of the speed reducer need to be lubricated. In current technology, lubricating oil is typically injected into the reducer's interior for lubrication; however, the rotating gears agitate the lubricating oil.

[0003] A search revealed a patent application, CN118582525A, which discloses a gearbox with a drainage structure on the differential housing for introducing oil into the interior of the differential housing. However, in this application, the oil accumulates inside the differential, and the gears agitate the oil during rotation for lubrication, but this agitation results in a loss of transmission efficiency. Utility Model Content

[0004] This application provides a speed reducer, a powertrain, and a vehicle. It aims to at least address the problem in related technologies of efficiency loss caused by oil churning or entrainment in speed reducers.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] According to a first aspect of this application, a speed reducer is provided, the speed reducer includes a housing, the housing includes a first end for connection with a motor housing, and a return groove is provided on the bottom wall of the housing, the return groove extends toward and through the first end.

[0007] With the above setup, after the lubricating fluid is injected into the reducer and lubricates the internal parts of the reducer, the lubricating fluid drips onto the bottom wall under the action of gravity and collects in the return groove on the bottom wall. It flows along the extension direction of the return groove until it flows out of the reducer at the first end. In this way, the lubricating fluid will not accumulate at the bottom of the reducer, nor will it cause agitation of the lubricating fluid during the operation of the reducer. This reduces the efficiency loss of the reducer gears caused by oil agitation and improves the transmission efficiency of the reducer.

[0008] In one possible implementation, the reflux trough includes a bottom surface that is lower than the inner wall surface of the housing.

[0009] With the above configuration, the return channel is lower than the inner wall of the housing, which facilitates the flow of lubricating fluid adhering to the inner wall of the housing into the return channel.

[0010] In one possible implementation, the reflux trough includes a side surface, one end of which is connected to the bottom wall and the other end of which is connected to the bottom surface; from the end connected to the bottom surface to the end connected to the inner wall surface, the side surface is inclined in a direction away from the bottom surface.

[0011] The above-mentioned design allows the side to guide the flow of lubricating fluid, facilitating its flow into the return channel.

[0012] In one possible implementation, the reflux trough includes an opening with an area greater than or equal to the area of ​​the bottom surface.

[0013] With the above settings, the volume of the return tank can be increased while keeping the bottom area of ​​the return tank fixed, and the amount of liquid stored in the return tank can be increased when the flow of lubricating fluid is not smooth.

[0014] In one possible implementation, the housing includes reinforcing ribs disposed in the reflux groove and connected to the bottom surface. The extending direction of the reinforcing ribs is consistent with the extending direction of the reflux groove, and the reinforcing ribs divide the reflux groove into a first sub-groove and a second sub-groove.

[0015] The above-mentioned reinforcement ribs can increase the structural strength of the shell at the reflux channel.

[0016] In one possible implementation, the reducer includes a reduction gear assembly rotatably disposed inside a housing.

[0017] With the above settings, the reduction gear set has high stability and is easy to maintain.

[0018] In one possible implementation, the reduction gear assembly is a planetary gear assembly.

[0019] With the above configuration, the planetary gear assembly achieves higher transmission efficiency through the joint operation of multiple gears. The multiple planetary gears share the input load, resulting in a more uniform load distribution and providing smooth power transmission.

[0020] According to a second aspect provided in this application, a powertrain is provided, the powertrain including an electric motor and a speed reducer in any embodiment of the first aspect, wherein the speed reducer is drive-connected to the electric motor.

[0021] In one possible implementation, a reflux pool is provided at the bottom of the motor, and the reflux tank is connected to the reflux pool, with the reflux pool being lower than the reflux tank.

[0022] With the above setup, the return tank guides the lubricating fluid to the return pool, preventing the lubricating fluid from accumulating in the reducer and reducing the efficiency loss of the reducer gears caused by oil churning. While meeting the reducer's lubrication requirements, the structure is simple, easy to assemble, and reduces costs.

[0023] According to a third aspect provided in this application, a vehicle is provided, the vehicle including an axle and a powertrain according to any embodiment of the second aspect, the powertrain being drive-connected to the axle.

[0024] The beneficial effects of this utility model are:

[0025] (1) Through the return groove, the lubricant will not accumulate at the bottom of the reducer, nor will it agitate the lubricant during the operation of the reducer, thus reducing the efficiency loss of the reducer gears caused by oil agitation. While meeting the lubrication requirements of the reducer, the structure is simple, easy to assemble, and reduces costs.

[0026] (2) The return groove is lower than the inner wall of the housing, so that the lubricating fluid attached to the inner wall of the housing can flow into the return groove.

[0027] (3) The side has a guiding effect on the lubricant, which facilitates the flow of the lubricant into the return tank through the side.

[0028] (4) With the bottom area of ​​the return tank fixed, increase the volume of the return tank. If the flow of lubricating fluid is not smooth, increase the amount of liquid stored in the return tank.

[0029] (5) Reinforcing ribs can increase the structural strength of the shell at the reflux channel.

[0030] (6) The planetary gear assembly has higher transmission efficiency because multiple gears work together. Multiple planetary gears share the input load, and the load distribution is more uniform, which can provide smooth power transmission.

[0031] It should be noted that the technical effects of any of the implementation methods in the second and third aspects can be found in the technical effects of the corresponding implementation methods in the first aspect, and will not be repeated here.

[0032] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a speed reducer structure provided in one embodiment of this application;

[0034] Figure 2 This is a schematic diagram of the reducer from another angle according to one embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the powertrain provided in one embodiment of this application.

[0036] In the figure, 1-reducer; 2-housing; 3-first end; 4-return groove; 41-bottom surface; 42-side surface; 43-groove; 5-reinforcing rib; 6-reduction gear assembly; 7-planetary gear assembly; 8-motor; 81-return pool. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0038] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0039] The powertrain is a crucial component of a vehicle's power source. Within a coaxial reducer, the planetary gear system is one of its core components, consisting of multiple planetary gears revolving around and rotating around a sun gear. Lubricating fluid forms a protective film between moving parts such as gears and bearings, reducing wear caused by direct contact and thus extending the equipment's lifespan. However, lubricating oil often accumulates inside the reducer. During operation, this combined motion generates some agitation, and this agitation and oil slickness reduces the reducer's efficiency.

[0040] In related technologies, the structure for preventing oil churning and oil slicking inside the reducer is complex, resulting in high production and maintenance costs.

[0041] Figure 1 This is a schematic diagram of a speed reducer structure provided in one embodiment of this application. Figure 2 This is a structural schematic diagram of a speed reducer provided in one embodiment of this application from another angle. Figure 3 This is a schematic diagram of the powertrain provided in one embodiment of this application.

[0042] Combination Figure 1 , Figure 2 and Figure 3 As shown, this application provides a speed reducer 1, which includes a housing 2. The housing 2 includes a first end 3, which is used to connect to the housing 2 of a motor 8. A return groove 4 is provided on the bottom wall of the housing 2 of the speed reducer 1, which extends toward and through the first end 3.

[0043] The housing 2 provides protection for internal components such as gears and provides a sealed working environment for them. The first end 3 of the housing 2 is used for connection with the housing 2 of the motor 8.

[0044] For example, the connection method between the reducer 1 housing 2 and the motor 8 housing 2 is at least one of the following: bolt connection, welding, integral molding, or other connection methods. This application does not specifically limit this.

[0045] After the lubricating fluid is injected into the reducer 1 to lubricate the internal parts of the reducer 1, the lubricating fluid drips onto the bottom wall under the action of gravity and collects in the return groove 4 on the bottom wall. It flows along the extension direction of the return groove 4 until it flows out of the reducer 1 at the first end 3. In this way, the lubricating fluid will not accumulate at the bottom of the reducer 1, nor will it cause agitation of the lubricating fluid during the operation of the reducer 1, thereby reducing the efficiency loss of the gears of the reducer 1 caused by oil agitation.

[0046] For example, the reflux tank 4 is prepared by at least one of casting, stamping, injection molding, and machining. The reflux tank 4 has a simple structure and is easy to process.

[0047] The embodiments of this application will be described in detail below with reference to the accompanying drawings, and the application scenarios of the embodiments of this application will be introduced first before the detailed description of the embodiments of this application.

[0048] This application provides a vehicle, which includes an axle and a powertrain, the powertrain being drivenly connected to the axle.

[0049] The powertrain is the system in a vehicle responsible for generating and transmitting power. The powertrain generates power and transmits it to the axles, and then to the wheels, thus enabling the vehicle to move.

[0050] For example, the vehicle may be one of a passenger car, a van, a commercial vehicle, or a special vehicle. The vehicle provided in this application is an electric vehicle or a hybrid vehicle.

[0051] See also Figure 3 This application provides a powertrain, which includes at least a reducer 1 and a motor 8, wherein the reducer 1 and the motor 8 are connected in a transmission connection.

[0052] Among them, the reducer 1 is connected to the motor 8 through transmission. The reducer 1 reduces the speed and amplifies the torque through the reduction ratio, so that the vehicle has better power performance when starting and climbing.

[0053] For example, the motor 8 may be at least one of a DC motor 8, an AC motor 8, or a brushless motor 8.

[0054] The following will describe an embodiment of reducer 1. See also: Figure 1 and Figure 2 .

[0055] For example, the reducer 1 provided in this application is a coaxial reducer 1. The coaxial reducer 1 can reduce energy loss and improve transmission efficiency.

[0056] For example, the cross-sectional shape of the reflux groove 4 can be any one of a semi-circle, a triangle, or a quadrilateral.

[0057] In one possible implementation, the reflux trough 4 includes a bottom surface 41, which is lower than the inner wall surface of the housing 2.

[0058] In one application scenario, the cross-sectional shape of the inner wall of the housing 2 is circular, and the cross-sectional shape of the bottom surface 41 of the return channel 4 is curved. In this case, the bottom surface 41 of the return channel 4 is lower than the inner wall of the housing 2, which facilitates the flow of lubricating fluid attached to the inner wall of the housing 2 into the return channel 4.

[0059] In one possible implementation, the cross-section of the reflux channel 4 is triangular, with one side of the triangle flush with the wall of the shell 2. The triangular structure is stable and can improve the compressive and tensile strength of the shell 2.

[0060] In one possible implementation, the reflux trough 4 includes a side surface 42, one end of which is connected to the bottom wall and the other end of which is connected to the bottom surface 41; from the end connected to the bottom surface 41 to the end connected to the inner wall surface, the side surface 42 is inclined in a direction away from the bottom surface 41.

[0061] The side 42 of the return tank 4 is designed as an inclined structure. Specifically, the side 42 is a guide surface. The side 42 can optimize the flow path of the lubricant, reduce flow resistance, and guide the lubricant to gather in the central area of ​​the return tank 4, thereby improving the return efficiency of the liquid.

[0062] Meanwhile, the inclined arrangement of side 42 helps prevent coolant stagnation, reduces the formation of deposits, and improves the stability and reliability of reducer 1 during long-term operation.

[0063] In one possible implementation, the reflux trough 4 includes a trough 43, the area of ​​which is greater than or equal to the area of ​​the bottom surface 41.

[0064] The above configuration effectively reduces the resistance of the lubricating fluid in the return tank 4, promotes smooth return of the lubricating fluid, and avoids sedimentation and blockage problems caused by lubricating fluid stagnation. At the same time, the volume of the return tank 4 can be increased while keeping the bottom surface 41 area fixed, thereby increasing the storage capacity of the return tank 4 when the lubricating fluid flow is not smooth.

[0065] In one possible implementation, the housing 2 includes a reinforcing rib 5 disposed in the return channel 4 and connected to the bottom surface 41. The extending direction of the reinforcing rib 5 is consistent with the extending direction of the return channel 4, and the reinforcing rib 5 divides the return channel 4 into a first sub-channel and a second sub-channel. The reinforcing rib 5 can increase the structural strength of the housing 2 at the return channel 4.

[0066] In one application scenario, for ease of maintenance, a cover plate is provided at the second end of the reducer 1 housing 2 away from the first end 3. The cover plate is bolted to the reducer 1 housing 2, and the reinforcing rib 5 provides space for the bolts. At the same time, the reinforcing rib 5 is provided at the return channel 4, increasing the connection point when connected to the cover plate, which can improve the sealing between the return channel 4 and the cover plate.

[0067] In one possible implementation, the reducer 1 includes a reduction gear assembly 6, which is rotatably disposed inside the housing 2. The reduction gear assembly has high stability and is easy to maintain.

[0068] In one possible implementation, the reduction gear assembly 6 is a planetary gear assembly 7.

[0069] The planetary gear assembly 7 results in a more even load distribution, reducing wear on individual gears and improving system durability. Furthermore, the planetary gear assembly 7 effectively reduces output speed while increasing torque, allowing the equipment to maintain high efficiency at lower speeds. Simultaneously, the planetary gear assembly 7 offers greater flexibility in space utilization, enabling efficient power transmission within a compact space.

[0070] The following will describe an embodiment of the powertrain.

[0071] Combination Figure 1 and Figure 3 In one possible implementation, a reflux pool 81 is provided at the bottom of the motor 8, and the reflux trough 4 is connected to the reflux pool 81, with the reflux pool 81 being lower than the reflux trough 4.

[0072] With the above settings, the return tank 4 guides the lubricating fluid to the return pool 81, so that the lubricating fluid will not accumulate in the reducer 1, reducing the efficiency loss of the gears of the reducer 1 caused by oil stirring. While meeting the lubrication requirements of the reducer 1, the structure is simple, easy to assemble, and reduces costs.

[0073] For example, the lubricant in this application may be engine oil.

[0074] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A speed reducer (1), characterized in that, The reducer (1) includes: The housing (2) includes a first end (3) for connecting to a motor (8). A return groove (4) is provided on the bottom wall of the housing (2), which extends toward and through the first end (3).

2. The reducer (1) according to claim 1, characterized in that, The reflux trough (4) includes a bottom surface (41) which is lower than the inner wall surface of the housing (2).

3. The reducer (1) according to claim 2, characterized in that, The return channel (4) includes a side (42), one end of which is connected to the bottom wall and the other end of which is connected to the bottom surface (41); from the end connected to the bottom surface (41) to the end connected to the inner wall, the side (42) is inclined in a direction away from the bottom surface (41).

4. The reducer (1) according to claim 2, characterized in that, The return channel (4) includes a slot (43), the area of ​​which is greater than or equal to the area of ​​the bottom surface (41).

5. The reducer (1) according to any one of claims 2-4, characterized in that, The housing (2) includes a reinforcing rib (5), which is disposed in the reflux groove (4) and connected to the bottom surface (41). The extending direction of the reinforcing rib (5) is consistent with the extending direction of the reflux groove (4). The reinforcing rib (5) divides the reflux groove (4) into a first sub-groove and a second sub-groove.

6. The reducer (1) according to claim 1, characterized in that, The reducer (1) includes a reduction gear assembly (6), which is rotatably disposed inside the housing (2).

7. The reducer (1) according to claim 6, characterized in that, The reduction gear assembly (6) is a planetary gear assembly (7).

8. A powertrain, characterized in that, include: Motor (8); The reducer (1) according to any one of claims 1-7 is connected to the motor (8) in a transmission connection.

9. The powertrain according to claim 8, characterized in that, The motor (8) is provided with a reflux pool (81) at the bottom, and the reflux trough (4) is connected to the reflux pool (81). The reflux pool (81) is lower than the reflux trough (4).

10. A vehicle, characterized in that, It includes an axle and the powertrain as described in claim 8 or 9, the powertrain being drive-connected to the axle.

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