An electric drive bridge reducer

Abstract

This application provides an electric drive axle reducer, comprising: a reducer housing; an input shaft bearing housing disposed on the reducer housing, wherein an input shaft bearing is disposed inside and connected to an input gear shaft; an intermediate shaft bearing housing disposed on the reducer housing, wherein an intermediate shaft bearing is disposed inside and connected to an intermediate shaft, the intermediate shaft having an intermediate shaft gear meshing with the input gear shaft, the intermediate shaft gear being immersed in lubricating oil; a first oil guide plate disposed on the reducer housing, communicating with the interiors of both the input shaft bearing housing and the intermediate shaft bearing housing; and a second oil guide plate disposed on the reducer housing, communicating with the interior of the intermediate shaft bearing housing. This application can improve the problems of poor bearing lubrication and high-temperature erosion.

Description

Technical Field

[0001] This application relates to the field of speed reducer technology, and more particularly to an electric drive bridge speed reducer. Background Technology

[0002] Electric drive axles are key components for new energy vehicles to gain a foothold in the market and play a positive role in achieving the "dual carbon" goal. Compared with traditional axles, electric drive axles adopt a motor-driven, multi-stage reduction gear main reduction structure. The structural form of electric drive axles and the high speed of the motor make the excellent bearing lubrication a crucial factor in determining the reliability and service life of electric drive axles.

[0003] Currently, most bearings in electric drive axle reducers are lubricated using the traditional method of rotating gears splashing lubricating oil. The rotating gears agitate the lubricating oil, causing it to circulate repeatedly inside the reducer to achieve lubrication and cooling of the bearings.

[0004] Because the bearing needs to be installed inside the bearing housing, the contact area between the bearing and the lubricating oil is small, making it difficult for the bearing to receive timely lubrication, which leads to problems such as poor lubrication and high-temperature erosion. Summary of the Invention

[0005] This application provides an electric drive bridge reducer that can improve the problems of poor lubrication and high-temperature erosion of bearings.

[0006] This application provides an electric drive bridge reducer, comprising:

[0007] Gearbox housing;

[0008] An input shaft bearing housing is provided on the reducer housing. An input shaft bearing is interference-fitted inside the input shaft bearing housing, and an input gear shaft is sleeved and interference-fitted on the inner ring of the input shaft bearing.

[0009] An intermediate shaft bearing housing is provided on the reducer housing. An intermediate shaft bearing is interference-fitted inside the intermediate shaft bearing housing. An intermediate shaft is sleeved and interference-fitted on the inner ring of the intermediate shaft bearing. An intermediate shaft gear is coaxially provided on the intermediate shaft. The intermediate shaft gear meshes with the teeth on the input gear shaft. The bottom of the intermediate shaft gear is immersed in the lubricating oil inside the reducer housing.

[0010] A first oil guide plate is disposed on the reducer housing and located at the top of the input shaft bearing housing. The first oil guide plate is in communication with the interior of both the input shaft bearing housing and the intermediate shaft bearing housing. The first oil guide plate is used to collect the lubricating oil splashed up when the intermediate shaft gear rotates and guide it into the interior of the input shaft bearing housing and the intermediate shaft bearing housing.

[0011] The second oil guide plate is disposed on the reducer housing and located on top of the intermediate shaft bearing housing. The second oil guide plate communicates with the interior of the intermediate shaft bearing housing. The second oil guide plate is used to collect the lubricating oil splashed up when the intermediate shaft gear rotates and guide it into the interior of the intermediate shaft bearing housing.

[0012] In one possible design, the first oil guide plate includes a first oil baffle wall, a first oil collecting wall, and a first oil guiding cavity that are connected to each other. The first oil collecting wall is located between the first oil baffle wall and the first oil guiding cavity. The first oil collecting wall has a gap with the inner wall of the reducer housing and forms a first oil inlet. The end of the first oil guiding cavity away from the first oil collecting wall is connected to the interior of both the input shaft bearing seat and the intermediate shaft bearing seat.

[0013] The first oil baffle is set vertically or inclined, and the first oil collecting wall is set as an arc or V-shaped structure, with the concave side corresponding to the top inner wall of the reducer housing.

[0014] In one possible design, the distance between the end faces of the first oil baffle and the first oil collecting wall and the end face of the intermediate shaft gear away from the intermediate shaft bearing seat is set as L1, the width of the intermediate shaft gear is set as D, and the length range of L1 is set to 0.8 times D to 1.2 times D.

[0015] The angle between the first oil collecting wall and the axis of the intermediate shaft gear is set to β, where β is less than 10°, and the first oil collecting wall extends inclinedly toward the top of the reducer housing.

[0016] In one possible design, the second oil guide plate includes a second oil baffle wall, a second oil collecting wall, and a second oil guiding cavity that are connected to each other. The second oil collecting wall is located between the second oil baffle wall and the second oil guiding cavity. The second oil collecting wall has a gap with the inner wall of the reducer housing and forms a second oil inlet. The end of the second oil guiding cavity away from the second oil collecting wall is connected to the interior of the intermediate shaft bearing seat.

[0017] The second oil baffle is set vertically or inclined, and the second oil collecting wall is set as an arc or V-shaped structure, with the concave side corresponding to the top inner wall of the reducer housing.

[0018] In one possible design, the distance between the end faces of the second oil baffle and the second oil collecting wall and the end face of the intermediate shaft gear away from the intermediate shaft bearing seat is set to L2, the width of the intermediate shaft gear is set to D, and the length range of L2 is set to 0.3 times DD.

[0019] The angle between the second oil collecting wall and the axis of the intermediate shaft gear is set to α, where α is less than 10°, and the second oil collecting wall extends inclinedly toward the top of the reducer housing.

[0020] In one possible design, φ is set as the slope angle of the vehicle when going uphill or downhill, the angle between the first oil inlet and the horizontal plane is set as θ, and 15° < θ < (90° - 1.5φ) is set, and the angle between the second oil inlet and the horizontal plane is set as γ, and 15° < γ < (90° - 1.5φ) is set.

[0021] In one possible design, the input shaft bearing housing has an input shaft bearing housing oil inlet, and the input shaft bearing housing oil inlet is connected to the first oil guide cavity;

[0022] The intermediate shaft bearing housing has a main oil inlet and a secondary oil inlet. The main oil inlet is connected to the second oil guide cavity, and the secondary oil inlet is connected to the first oil guide cavity.

[0023] In one possible design, the input shaft bearing housing has an oil drain port, which is lower than the axis of the input shaft bearing housing.

[0024] The intermediate shaft bearing housing has an oil drain port, which is lower than the axis of the intermediate shaft bearing housing.

[0025] In one possible design, a gap is provided between the inner wall of the reducer housing and the intermediate shaft gear to form a guide groove, the shape of which is adapted to the intermediate shaft gear.

[0026] In one possible design, the bottom quarter to one-third of the intermediate shaft gear is immersed in lubricating oil inside the reducer housing.

[0027] This application provides an electric drive bridge reducer, which, without using an active lubrication system, has a first oil guide plate and a second oil guide plate on the reducer housing for collecting and storing lubricating oil, as well as a guide groove structure at the bottom of the reducer housing surrounding the intermediate shaft gear.

[0028] When the intermediate shaft gear rotates, it agitates the lubricating oil and causes it to splash. The splashed lubricating oil flows into the interior of the first and second oil guide plates. The first and second oil guide plates guide the lubricating oil into the interior of the input shaft bearing housing and the intermediate shaft bearing housing through their own oil channels, so that the corresponding bearings can receive continuous lubrication in a timely manner, thus improving the technical problems of poor lubrication and high-temperature erosion of the bearings.

[0029] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the internal structure of the electric drive bridge reducer provided in the embodiments of this application;

[0032] Figure 2 A first-view structural schematic diagram of the reducer housing in the electric drive bridge reducer provided in an embodiment of this application;

[0033] Figure 3 A second-view structural schematic diagram of the reducer housing in the electric drive bridge reducer provided in an embodiment of this application;

[0034] Figure 4 This is a partial cross-sectional view of the location of the first oil guide plate in the electric drive bridge reducer provided in the embodiment of this application;

[0035] Figure 5 This is a partial cross-sectional view of the location of the second oil guide plate in the electric drive bridge reducer provided in the embodiment of this application;

[0036] Figure 6 A front view of the reducer housing in the electric drive bridge reducer provided in an embodiment of this application;

[0037] Figure 7 This is a diagram showing the flow direction of lubricating oil inside the reducer housing in the electric drive bridge reducer provided in this embodiment of the application.

[0038] Figure label:

[0039] 100 - Gearbox housing;

[0040] 110 - Guide groove;

[0041] 200 - Input shaft bearing housing;

[0042] 210 - Input shaft bearing housing oil inlet;

[0043] 300 - Intermediate shaft bearing housing;

[0044] 310 - Intermediate shaft bearing housing main oil inlet;

[0045] 320 - Intermediate shaft bearing housing auxiliary oil inlet;

[0046] 400 - Input shaft bearing housing oil drain port;

[0047] 500 - Input gear shaft;

[0048] 600-Intermediate shaft bearing housing oil drain port;

[0049] 700-Intermediate shaft gear;

[0050] 800 - First oil guide plate;

[0051] 810 - First oil baffle;

[0052] 820 - Episode 1: Oil Wall;

[0053] 830 - First oil guide chamber;

[0054] 900 - Second oil guide plate;

[0055] 910 - Second oil barrier;

[0056] 920 - Episode 2: Oil Wall;

[0057] 930 - Second oil guide chamber.

[0058] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular 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, for example, in orders other than those illustrated or described herein.

[0061] In this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0062] As mentioned in the background section, the electric drive axle is a key component for new energy vehicles to gain a foothold in the market and plays a positive role in achieving the "dual carbon" goal. Compared with traditional axles, the electric drive axle adopts a motor-driven, multi-stage reduction gear main reduction structure. The structural form of the electric drive axle and the high speed of the motor make the excellent bearing lubrication a crucial factor in determining the reliability and service life of the electric drive axle.

[0063] Currently, most bearings in electric drive axle reducers are lubricated using the traditional method of rotating gears splashing lubricating oil. The rotating gears agitate the lubricating oil, causing it to circulate repeatedly inside the reducer to achieve lubrication and cooling of the bearings.

[0064] Because the bearing needs to be installed inside the bearing housing, the contact area between the bearing and the lubricating oil is small, making it difficult for the bearing to receive timely lubrication, which leads to problems such as poor lubrication and high-temperature erosion.

[0065] Therefore, in order to improve or solve the above-mentioned technical problems, this application provides an electric drive bridge reducer. In the technical solution provided by this application, without using an active lubrication system, a first oil guide plate and a second oil guide plate for collecting and storing lubricating oil are provided on the reducer housing, as well as a guide groove structure that surrounds the intermediate shaft gear at the bottom of the reducer housing.

[0066] When the intermediate shaft gear rotates, it agitates the lubricating oil and causes it to splash. The splashed lubricating oil flows into the interior of the first and second oil guide plates. The first and second oil guide plates guide the lubricating oil into the interior of the input shaft bearing housing and the intermediate shaft bearing housing through their own oil channels, so that the corresponding bearings can receive continuous lubrication in a timely manner, thus improving the technical problems of poor lubrication and high-temperature erosion of the bearings.

[0067] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0068] The following is for reference. Figures 1-7 This application provides a detailed description of an electric drive bridge reducer according to an embodiment.

[0069] Figure 1 This is a schematic diagram of the internal structure of the electric drive bridge reducer provided in the embodiments of this application. Figure 2 This is a first-view structural schematic diagram of the reducer housing in the electric drive bridge reducer provided in an embodiment of this application. Figure 3 This is a second-view structural schematic diagram of the reducer housing in the electric drive bridge reducer provided in an embodiment of this application. Figure 4 This is a partial cross-sectional view of the location of the first oil guide plate in the electric drive axle reducer provided in the embodiment of this application. Figure 5 This is a partial cross-sectional view of the location of the second oil guide plate in the electric drive axle reducer provided in the embodiment of this application. Figure 6 This is a front view of the reducer housing in the electric drive bridge reducer provided in the embodiment of this application. Figure 7 This is a diagram showing the flow direction of lubricating oil inside the reducer housing in the electric drive bridge reducer provided in this embodiment of the application.

[0070] like Figure 1 , Figure 2 and Figure 3 As shown, the electric drive axle reducer includes: a reducer housing 100, with an input shaft bearing housing 200 and an intermediate shaft bearing housing 300 integrally formed on the inner wall of the reducer housing 100 facing the interior of the electric drive axle reducer; the axis of the input shaft bearing housing 200 and the axis of the intermediate shaft bearing housing 300 are located on the same horizontal plane; an input shaft bearing is interference-fitted inside the input shaft bearing housing 200, and an input gear shaft 500 is sleeved and interference-fitted on the inner ring of the input shaft bearing; an intermediate shaft bearing is interference-fitted inside the intermediate shaft bearing housing 300, and an intermediate shaft is sleeved and interference-fitted on the inner ring of the intermediate shaft bearing; an intermediate shaft gear 700 is coaxially fixedly sleeved on the intermediate shaft, and the intermediate shaft gear 700 meshes with the teeth on the input gear shaft 500; the bottom of the intermediate shaft gear 700 is immersed in the lubricating oil inside the reducer housing 100.

[0071] like Figure 1 , Figure 2 and Figure 3 As shown, the reducer housing 100 has a first oil guide plate 800 and a second oil guide plate 900 integrally formed on the inner wall facing the inside of the electric drive bridge reducer.

[0072] like Figure 1 , Figure 2 and Figure 3 As shown, the first oil guide plate 800 is located on the top of the input shaft bearing housing 200. The first oil guide plate 800 is connected to the interior of both the input shaft bearing housing 200 and the intermediate shaft bearing housing 300. The first oil guide plate 800 is used to collect the lubricating oil that is agitated and splashed when the intermediate shaft gear 700 rotates and to guide the lubricating oil into the interior of the input shaft bearing housing 200 and the intermediate shaft bearing housing 300.

[0073] like Figure 1 , Figure 2 and Figure 3 As shown, the second oil guide plate 900 is located on the top of the intermediate shaft bearing housing 300. The second oil guide plate 900 is connected to the interior of the intermediate shaft bearing housing 300. The second oil guide plate 900 is used to collect the lubricating oil that is stirred and splashed when the intermediate shaft gear 700 rotates and to guide the lubricating oil into the interior of the intermediate shaft bearing housing 300.

[0074] Specifically, such as Figure 7 As shown, when the vehicle moves forward, the intermediate shaft gear 700 rotates clockwise, stirring up the lubricating oil and splashing it. Part of the splashed lubricating oil can directly enter the second oil guide plate 900 according to its own motion trajectory, and then enter the intermediate shaft bearing housing 300 to lubricate the bearing. Another part of the lubricating oil hits the inner wall of the reducer housing 100 and flows into the first oil guide plate 800 or directly into the interior of the first oil guide plate 800, and then flows into the intermediate shaft bearing housing 300 and the input shaft bearing housing 200 respectively to lubricate the bearing.

[0075] like Figure 7 As shown, when the vehicle reverses, the intermediate shaft gear 700 rotates counterclockwise, agitating and splashing lubricating oil. Based on the movement of the intermediate shaft gear 700, the first oil guide plate 800, acting as the primary lubricating oil collection structure, lubricates the bearings. Most of the lubricating oil is collected by the first oil guide plate 800 and flows into the intermediate shaft bearing housing 300 and the input shaft bearing housing 200 respectively, lubricating the corresponding bearings. A small portion of the lubricating oil flows into the second oil guide plate 900 and then into the intermediate shaft bearing housing 300, lubricating the bearings.

[0076] When the lubricating oil inside the input shaft bearing housing 200 and the intermediate shaft bearing housing 300 is full, the excess lubricating oil will flow from various positions of the bearing and the joint between the bearing and the input shaft bearing housing 200 or the intermediate shaft bearing housing 300 into the bottom of the reducer housing 100, and re-participate in the lubricating oil circulation.

[0077] The specific structures of the first oil guide plate 800 and the second oil guide plate 900, as well as other auxiliary oil passage structures and related oil guiding structures, will be disclosed in detail below.

[0078] Furthermore, in some embodiments provided in this application, such as Figure 2 and Figure 3 As shown, the first oil guide plate 800 includes a first oil baffle wall 810, a first oil collecting wall 820, and a first oil guiding cavity 830 that are connected to each other.

[0079] The first oil collecting wall 820 is located between the first oil blocking wall 810 and the first oil guiding cavity 830. The first oil collecting wall 820 has a gap with the inner wall of the reducer housing 100 and forms a first oil inlet, which faces the intermediate shaft gear 700. The first oil collecting wall 820 can be configured as an arc-shaped or V-shaped structure, and the concave side corresponds to the top inner wall of the reducer housing 100. In this embodiment, as shown in the attached drawings, the first oil collecting wall 820 adopts an arc-shaped structure.

[0080] The end of the first oil guide cavity 830 away from the first oil collecting wall 820 is connected to the interior of both the input shaft bearing seat 200 and the intermediate shaft bearing seat 300; the top of the first oil baffle wall 810 is fixedly connected to the top of the inner wall of the reducer housing 100. The first oil baffle wall 810 can be set vertically or inclined. In this embodiment, as shown in the attached drawings, the first oil baffle wall 810 adopts an inclined structure.

[0081] The input shaft bearing housing 200 has an input shaft bearing housing oil inlet 210, which is higher than the axis of the input shaft bearing housing 200 and communicates with the first oil guide cavity 830. The intermediate shaft bearing housing 300 has an intermediate shaft bearing housing auxiliary oil inlet 320, which communicates with the first oil guide cavity 830.

[0082] Specifically, during vehicle operation, the splashed lubricating oil can directly hit the first oil baffle wall 810 through the first oil inlet and flow into the first oil collection wall 820. Alternatively, the splashed lubricating oil can first hit the inclined inner wall at the top of the reducer housing 100, and then flow into the first oil collection wall 820 along the inclined inner wall at the top of the reducer housing 100 and the first oil baffle wall 810. The lubricating oil continues to flow along the first oil guide cavity 830 and into the input shaft bearing housing 200 and the intermediate shaft bearing housing 300 through the input shaft bearing housing inlet 210 and the intermediate shaft bearing housing auxiliary inlet 320, respectively, to achieve lubrication of the corresponding bearings.

[0083] Furthermore, in some embodiments provided in this application, such as Figure 2 and Figure 3 As shown, the second oil guide plate 900 includes a second oil baffle wall 910, a second oil collecting wall 920, and a second oil guiding cavity 930 that are connected to each other.

[0084] The second oil collecting wall 920 is located between the second oil blocking wall 910 and the second oil guiding cavity 930. The second oil collecting wall 920 has a gap with the inner wall of the reducer housing 100 and forms a second oil inlet, which faces the first oil inlet. The second oil collecting wall 920 can be configured as an arc-shaped or V-shaped structure, and the concave side corresponds to the top inner wall of the reducer housing 100. In this embodiment, as shown in the attached drawings, the second oil collecting wall 920 adopts an arc-shaped structure.

[0085] The second oil baffle 910 can be set vertically or at an angle. In this embodiment, as shown in the attached drawings, the second oil baffle 910 adopts an angled structure, and the top of the second oil baffle 910 is fixedly connected to the top of the inner wall of the reducer housing 100.

[0086] The end of the second oil guide cavity 930 away from the second oil collecting wall 920 is connected to the interior of the intermediate shaft bearing seat 300; the intermediate shaft bearing seat 300 is provided with an intermediate shaft bearing seat main oil inlet 310, which is higher than the axis of the intermediate shaft bearing seat 300, and the intermediate shaft bearing seat main oil inlet 310 is connected to the second oil guide cavity 930.

[0087] Specifically, during vehicle operation, splashed lubricating oil can directly hit the second oil baffle 910 through the second oil inlet and flow into the second oil collection wall 920. The lubricating oil continues to flow along the second oil guide cavity 930 and into the intermediate shaft bearing housing 300 through the main oil inlet 310 of the intermediate shaft bearing housing, thereby achieving lubrication of the corresponding bearing.

[0088] Furthermore, in some embodiments provided in this application, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the distance between the end faces of the first oil baffle wall 810 and the first oil collector wall 820 and the end face of the intermediate shaft gear 700 away from the intermediate shaft bearing seat 300 is set as L1, and the width of the intermediate shaft gear 700 is set as D. In this embodiment, the length range of L1 is set to 0.8 times D to 1.2 times D.

[0089] Specifically, the length of L1 is set to be 0.8 times D to 1.2 times D. This condition is based on the constraints of this configuration, mainly considering the relative positional relationship between the intermediate shaft gear 700 and the first oil guide plate 800. The first oil receiving wall is located above and to the side of the intermediate shaft gear 700, and its position is relatively low. The first oil receiving wall has a significant impact on the blocking effect of the intermediate shaft gear 700 on agitating and splashing lubricating oil. If the first oil receiving wall is too long, it will block the splashed lubricating oil and affect the amount of lubricating oil collected by the first oil guide plate 800 and the second oil guide plate 900. If the first oil receiving wall is too short, it will result in insufficient lubricating oil collected by the first oil guide plate 800. Therefore, the length of the first oil receiving wall is set within the range that does not hinder the splashing of lubricating oil, that is, the length of L1 is 0.8 times D to 1.2 times D.

[0090] Furthermore, in some embodiments provided in this application, such as Figure 2 , Figure 3 and Figure 4As shown, the angle between the first oil collector wall 820 and the axis of the intermediate shaft gear 700 is set to β, which is less than 10°, and the first oil collector wall 820 extends inclinedly toward the top of the reducer housing 100.

[0091] Specifically, if β is greater than 10°, the distance between the first oil collecting wall 820 and the inner wall of the reducer housing 100 will be small, which will affect the normal collection of lubricating oil by the first oil guide plate 800; if β is less than 0°, that is, the first oil collecting wall 820 extends inclined towards the bottom of the reducer housing 100, the lubricating oil will flow directly into the bottom of the reducer housing 100 along the first oil collecting wall 820, and the first oil guide plate 800 will be unable to collect lubricating oil.

[0092] Furthermore, in some embodiments provided in this application, such as Figure 2 , Figure 3 and Figure 5 As shown, the distance between the end faces of the second oil baffle wall 910 and the second oil collector wall 920 and the end face of the intermediate shaft gear 700 away from the intermediate shaft bearing seat 300 is set as L2, the width of the intermediate shaft gear 700 is set as D, and the length range of L2 is set to 0.3 times DD.

[0093] Specifically, the length range of L2 is set to 0.3 times DD. This condition is based on the constraints under this configuration and mainly considers the relative positional relationship between the intermediate shaft gear 700 and the second oil guide plate 900.

[0094] The second oil guide plate 920 is located above the intermediate shaft gear 700. The length range of L2 is set to 0.3 times DD to ensure that the second oil guide plate 900 does not completely block the intermediate shaft gear 700, so as to ensure the lubricating oil collection effect of the second oil guide plate 900.

[0095] Furthermore, in some embodiments provided in this application, such as Figure 2 , Figure 3 and Figure 5 As shown, the angle between the axis of the second oil collection wall 920 and the intermediate shaft gear 700 is set to α, which is less than 10°, and the second oil collection wall 920 extends inclinedly toward the top of the reducer housing 100.

[0096] Specifically, if α is greater than 10°, the distance between the second oil collecting wall 920 and the inner wall of the reducer housing 100 will be small, which will affect the normal collection of lubricating oil by the second oil guide plate 900; if α is less than 0°, that is, the second oil collecting wall 920 extends inclined towards the bottom of the reducer housing 100, the lubricating oil will flow directly into the bottom of the reducer housing 100 along the second oil collecting wall 920, and the second oil guide plate 900 will be unable to collect lubricating oil.

[0097] Furthermore, in some embodiments provided in this application, such as Figure 1 and Figure 2 As shown, a gap is provided between the bottom inner wall of the reducer housing 100 and the intermediate shaft gear 700 to form a guide groove 110. The shape of the guide groove 110 is adapted to the intermediate shaft gear 700, that is, the guide groove 110 is arc-shaped. Specifically, when the intermediate shaft gear 700 rotates and agitates the lubricating oil, the guide groove 110 has a guiding function, which can increase the amount of lubricating oil splashed.

[0098] Furthermore, in some embodiments provided in this application, such as Figure 2 , Figure 3 ,and Figure 6 As shown, the input shaft bearing housing 200 has an input shaft bearing housing oil drain port 400, which connects the interior of the input shaft bearing housing 200 to the reducer housing 100. The input shaft bearing housing oil drain port 400 is lower than the axis of the input shaft bearing housing 200. The intermediate shaft bearing housing 300 has an intermediate shaft bearing housing oil drain port 600, which connects the intermediate shaft bearing housing 300 to the reducer housing 100. The intermediate shaft bearing housing oil drain port 600 is lower than the axis of the intermediate shaft bearing housing 300.

[0099] Specifically, the input shaft bearing housing oil drain port 400 is used to regulate the internal air pressure and lubricating oil circulation of the input shaft bearing housing 200. When the lubricating oil level in the input shaft bearing housing 200 is higher than the input shaft bearing housing oil drain port 400, the lubricating oil flows out from the input shaft bearing housing oil drain port 400 and enters the bottom of the reducer housing 100 to re-participate in the lubricating oil circulation. The intermediate shaft bearing housing oil drain port 600 is used to regulate the internal air pressure and lubricating oil circulation of the intermediate shaft bearing housing 300. When the lubricating oil level in the intermediate shaft bearing housing 300 is higher than the intermediate shaft bearing housing oil drain port 600, the lubricating oil flows out from the intermediate shaft bearing housing oil drain port 600 and enters the bottom of the reducer housing 100 to re-participate in the lubricating oil circulation.

[0100] Furthermore, in some embodiments provided in this application, such as Figure 6 As shown, φ is set as the slope angle of the vehicle when going uphill or downhill, the angle between the first oil inlet and the horizontal plane is set as θ, and 15° < θ < (90° - 1.5φ) is set. The angle between the second oil inlet and the horizontal plane is set as γ, and 15° < γ < (90° - 1.5φ) is set.

[0101] Specifically, the aforementioned angle constraints are as follows: The lower limit is based on the structural design of the reducer housing 100 to prevent the openings of the first and second oil inlets from being too small, thus affecting the oil collection effect; the upper limit is designed considering the vehicle's uphill and downhill conditions to ensure that when the vehicle is going uphill or downhill, after the first oil collecting wall 820 and the second oil collecting wall 920 are tilted, the first and second oil inlets remain above the lowest point, preventing lubricating oil from flowing directly out of the first oil collecting wall 820 and the second oil collecting wall 920 without entering the first and second oil inlets.

[0102] Furthermore, in some embodiments provided in this application, such as Figure 1 As shown, one-quarter to one-third of the bottom of the intermediate shaft gear 700 is immersed in the lubricating oil inside the reducer housing 100. Specifically, this arrangement neither generates significant resistance to the rotation of the intermediate shaft gear 700 nor prevents it from splashing out enough lubricating oil during rotation, thereby providing continuous and efficient lubrication to the bearings in the input shaft bearing housing 200 and the intermediate shaft bearing housing 300.

[0103] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0104] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0105] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0106] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0107] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An electric drive bridge reducer, characterized in that, include: Gearbox housing; An input shaft bearing housing is provided on the reducer housing. An input shaft bearing is interference-fitted inside the input shaft bearing housing, and an input gear shaft is sleeved and interference-fitted on the inner ring of the input shaft bearing. An intermediate shaft bearing housing is provided on the reducer housing. An intermediate shaft bearing is interference-fitted inside the intermediate shaft bearing housing. An intermediate shaft is sleeved and interference-fitted on the inner ring of the intermediate shaft bearing. An intermediate shaft gear is coaxially provided on the intermediate shaft. The intermediate shaft gear meshes with the teeth on the input gear shaft. The bottom of the intermediate shaft gear is immersed in the lubricating oil inside the reducer housing. A first oil guide plate is disposed on the reducer housing and located at the top of the input shaft bearing housing. The first oil guide plate is in communication with the interior of both the input shaft bearing housing and the intermediate shaft bearing housing. The first oil guide plate is used to collect the lubricating oil splashed up when the intermediate shaft gear rotates and guide it into the interior of the input shaft bearing housing and the intermediate shaft bearing housing. The second oil guide plate is disposed on the reducer housing and located at the top of the intermediate shaft bearing seat. The second oil guide plate communicates with the interior of the intermediate shaft bearing seat. The second oil guide plate is used to collect the lubricating oil splashed up when the intermediate shaft gear rotates and guide it into the interior of the intermediate shaft bearing seat. The first oil guide plate includes a first oil baffle wall, a first oil collecting wall, and a first oil guiding cavity that are connected to each other. The first oil collecting wall is located between the first oil baffle wall and the first oil guiding cavity. The first oil collecting wall has a gap with the inner wall of the reducer housing and forms a first oil inlet. The end of the first oil guiding cavity away from the first oil collecting wall is connected to the interior of both the input shaft bearing seat and the intermediate shaft bearing seat. The first oil baffle is set vertically or inclined, and the first oil collecting wall is set as an arc or V-shaped structure, with the concave side corresponding to the top inner wall of the reducer housing.

2. The electric drive bridge reducer according to claim 1, characterized in that, The distance between the end face of the first oil baffle wall and the end face of the intermediate shaft gear away from the intermediate shaft bearing seat is set as L1, the width of the intermediate shaft gear is set as D, and the length range of L1 is set to 0.8 times D to 1.2 times D; The angle between the first oil collecting wall and the axis of the intermediate shaft gear is set to β, where β is less than 10°, and the first oil collecting wall extends inclinedly toward the top of the reducer housing.

3. The electric drive bridge reducer according to claim 1, characterized in that, The second oil guide plate includes a second oil baffle wall, a second oil collecting wall, and a second oil guiding cavity that are connected to each other. The second oil collecting wall is located between the second oil baffle wall and the second oil guiding cavity. The second oil collecting wall has a gap with the inner wall of the reducer housing and forms a second oil inlet. The end of the second oil guiding cavity away from the second oil collecting wall is connected to the interior of the intermediate shaft bearing seat. The second oil baffle is set vertically or inclined, and the second oil collecting wall is set as an arc or V-shaped structure, with the concave side corresponding to the top inner wall of the reducer housing.

4. The electric drive bridge reducer according to claim 3, characterized in that, The distance between the end face of the second oil baffle and the end face of the second oil collecting wall and the end face of the intermediate shaft gear away from the intermediate shaft bearing seat is set as L2, the width of the intermediate shaft gear is set as D, and the length range of L2 is set to 0.3 times DD; The angle between the second oil collecting wall and the axis of the intermediate shaft gear is set to α, where α is less than 10°, and the second oil collecting wall extends inclinedly toward the top of the reducer housing.

5. The electric drive bridge reducer according to claim 3, characterized in that, φ is set as the slope angle of the vehicle when going uphill or downhill. The angle between the first oil inlet and the horizontal plane is set as θ, with 15° < θ < (90° - 1.5φ). The angle between the second oil inlet and the horizontal plane is set as γ, with 15° < γ < (90° - 1.5φ).

6. The electric drive bridge reducer according to claim 3, characterized in that, The input shaft bearing housing has an input shaft bearing housing oil inlet, which is connected to the first oil guide cavity; The intermediate shaft bearing housing has a main oil inlet and a secondary oil inlet. The main oil inlet is connected to the second oil guide cavity, and the secondary oil inlet is connected to the first oil guide cavity.

7. An electric drive bridge reducer according to any one of claims 1-6, characterized in that, The input shaft bearing housing has an oil drain port, which is lower than the axis of the input shaft bearing housing. The intermediate shaft bearing housing has an oil drain port, which is lower than the axis of the intermediate shaft bearing housing.

8. An electric drive bridge reducer according to any one of claims 1-6, characterized in that, A gap is provided between the inner wall of the reducer housing and the intermediate shaft gear to form a guide groove, the shape of which is adapted to the intermediate shaft gear.

9. An electric drive bridge reducer according to any one of claims 1-6, characterized in that, One-quarter to one-third of the bottom of the intermediate shaft gear is immersed in the lubricating oil inside the reducer housing.

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