Electric drive system

Abstract

The utility model provides an electric drive system which comprises a speed reducer shell, a differential assembly and a pump body structure, and the speed reducer shell is provided with a containing cavity and an oil pumping way; the differential assembly is arranged in the accommodating cavity; the pump body structure is arranged on the oil pumping path; wherein the oil pumping way is provided with a main oil way and branch oil ways, the first end of the main oil way is communicated with a lubricating oil pool of the electric driving system, and the second end of the main oil way is communicated with at least one of a motor to-be-cooled area and a motor to-be-lubricated area of the electric driving system; the branch oil way is used for communicating the main oil way and the containing cavity so that part of lubricating oil in the lubricating oil pool can be introduced into the containing cavity to lubricate and / or cool the differential assembly. The differential assembly solves the problems that in the prior art, the differential assembly is sintered and a bearing is damaged due to poor lubrication of the differential assembly of an electric drive system, and even further the problems of failures such as breakage of an elastic pin, breakage of a planetary gear shaft and breakage of a shell of the differential assembly are caused.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy vehicle technical field, specifically, relate to a kind of electric drive system. BACKGROUND

[0002] With the development of new energy vehicles, the working conditions and environment of new energy vehicles are more diverse, and the requirements for new energy vehicles are more stringent, especially the performance requirements of electric drive system are higher and higher, especially the peak torque and its duration of electric drive system, the differential assembly in the reducer and the corresponding bearing are subjected to large torque, complex stress and harsh working conditions, and their strength, performance and other mechanical properties are constantly tested.

[0003] The oil splash lubrication and oil guiding structure of the existing water-cooled electric drive system depend on the volume of the reducer cavity, the amount of gear oil, the oil guiding rib, the oil channel design, the vehicle driving speed and other conditions. Under different slope and inclination conditions, the lubrication performance is different, which can affect the overall performance of the differential assembly. For example, poor lubrication of the differential assembly and the bearings of the differential assembly can cause sintering, bearing damage, and even further cause problems such as elastic pin fracture, planetary gear shaft breakage, and differential assembly housing rupture. SUMMARY

[0004] The main purpose of the utility model is to provide an electric drive system to solve the problem of poor lubrication of the differential assembly of the electric drive system in the prior art, which can cause sintering, bearing damage, and even further cause problems such as elastic pin fracture, planetary gear shaft breakage, and differential assembly housing rupture.

[0005] To achieve the above purpose, the utility model provides an electric drive system, which comprises a reducer housing, a differential assembly and a pump body structure, wherein the reducer housing has a containing cavity and a pump oil circuit; the differential assembly is arranged in the containing cavity; the pump body structure is arranged on the pump oil circuit; wherein the pump oil circuit has a main oil circuit and a branch oil circuit, the first end of the main oil circuit is communicated with the lubricating oil pool of the electric drive system, the second end of the main oil circuit is communicated with at least one of the motor cooling area and the motor lubrication area of the electric drive system; the branch oil circuit is used to communicate the main oil circuit and the containing cavity, so as to introduce part of the lubricating oil in the lubricating oil pool into the containing cavity to lubricate and / or cool the differential assembly.

[0006] In one exemplary embodiment, at least part of the branch oil circuit is located in the containing cavity and communicated with the containing cavity, and the end of the branch oil circuit away from the differential assembly is communicated with the main oil circuit.

[0007] In an exemplary embodiment, the first communication hole is formed in the passage wall of the main oil passage and extends along the radial direction of the main oil passage and penetrates the inner wall and the outer wall of the passage of the main oil passage, and the branch oil passage communicates with the main oil passage through the first communication hole.

[0008] In an exemplary embodiment, the branch oil passage is located below the main oil passage.

[0009] In an exemplary embodiment, the oil injection hole is formed in at least one of the passage wall and the passage end of the branch oil passage located in the accommodating cavity.

[0010] In an exemplary embodiment, the cross-sectional area of the hole cross-section of the oil injection hole is smaller than the cross-sectional area of the passage cross-section of the branch oil passage.

[0011] In an exemplary embodiment, the accommodating cavity comprises a gear chamber and a bearing chamber which are in communication; the differential assembly comprises a gear engagement set and a support bearing, the support bearing is used to support the gear engagement set, the gear engagement set is located in the gear chamber, and the support bearing is located in the bearing chamber; the oil injection hole located on the passage wall is arranged towards the gear chamber to inject oil into the gear chamber, and the oil injection hole located at the passage end is arranged towards the bearing chamber to inject oil into the bearing chamber.

[0012] In an exemplary embodiment, the reducer housing further has an assembly groove located below the main oil passage, and the main oil passage communicates with the assembly groove through the first communication hole; the branch oil passage comprises a first pipe segment, a transition pipe segment, and a second pipe segment, wherein the first end of the first pipe segment extends into the assembly groove and sequentially communicates with the main oil passage through the assembly groove and the first communication hole; the first end of the transition pipe segment is connected with the first pipe segment, the second end of the transition pipe segment extends towards the accommodating cavity in a bent manner; the first end of the second pipe segment is connected with the second end of the transition pipe segment, the second end of the second pipe segment forms the passage end, the second end of the second pipe segment has the oil injection hole, and the oil injection hole is formed in the pipe wall of the second pipe segment.

[0013] In an exemplary embodiment, the connection between the first pipe segment and the transition pipe segment is smoothly transitioned; and / or, the connection between the transition pipe segment and the second pipe segment is smoothly transitioned.

[0014] In an exemplary embodiment, the first pipe segment, the transition pipe segment, and the second pipe segment are sequentially connected in a V-shaped structure.

[0015] The technical scheme of the utility model provides an electric drive system, which comprises a reducer shell, a differential assembly and a pump body structure, wherein the reducer shell has a containing cavity and a pump oil circuit; the differential assembly is arranged in the containing cavity; the pump body structure is arranged on the pump oil circuit; wherein the pump oil circuit has a main oil circuit and a branch oil circuit, a first end of the main oil circuit is communicated with a lubricating oil pool of the electric drive system, a second end of the main oil circuit is communicated with at least one of a motor cooling area and a motor lubricating area of the electric drive system; the branch oil circuit is used for communicating the main oil circuit and the containing cavity, so as to introduce part of lubricating oil in the lubricating oil pool into the containing cavity to lubricate and / or cool the differential assembly.

[0016] By setting the pump oil circuit into a structure form comprising a main oil circuit and a branch oil circuit, at the same time, a first end of the main oil circuit is communicated with a lubricating oil pool of the electric drive system, and a second end of the main oil circuit is communicated with at least one of a motor cooling area and a motor lubricating area of the electric drive system, the lubricating oil in the lubricating oil pool is ensured to flow into at least one of the motor cooling area and the motor lubricating area of the electric drive system under the pumping and conveying of the pump body structure, so as to achieve the purposes of cooling the cooling part of the motor cooling area and lubricating the lubricating part of the motor lubricating area, in addition, the branch oil circuit communicates the main oil circuit and the containing cavity, so that part of lubricating oil in the lubricating oil pool is introduced into the containing cavity, thereby achieving the purposes of active lubrication and active cooling of the differential assembly without changing the overall peripheral size of the electric drive system, in addition, the overall structure of the electric drive system is relatively compact, so that the electric drive system provided by the application does not affect the normal arrangement of the new energy vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of the present application form a part of the present application and serve to provide a further understanding of the present application, the illustrative embodiments of the present application and the explanations thereof serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 Part of the structure schematic diagram of the electric drive system according to an optional embodiment of the utility model is shown;

[0019] Figure 2 A-A perspective view of the cross-sectional structure schematic diagram in Figure 1

[0020] Figure 3 An enlarged structure schematic diagram of B in Figure 2

[0021] Wherein, the above drawings include the following reference signs:

[0022] ​​10, speed reducer housing; 11, containing cavity; 111, gear chamber; 112, bearing chamber; 12, pump oil passage; 121, main oil passage; 1211, first communication hole; 122, branch oil passage; 1221, oil injection hole; 1222, first pipe section; 1223, transition pipe section; 1224, second pipe section; 13, assembly groove;

[0023] 20, differential assembly; 21, gear engagement group; 22, support bearing;

[0024] 30, pump body structure. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0026] In order to solve the problem of poor lubrication of the differential assembly of the electric drive system in the prior art, which leads to the phenomenon of sintering and bearing damage of the differential assembly, and even further leads to the problems of failure such as fracture of the elastic pin, fracture of the planetary gear shaft, and rupture of the housing of the differential assembly, the utility model provides an electric drive system.

[0027] As shown in Figures 1 to 3 The electric drive system comprises a speed reducer housing 10, a differential assembly 20 and a pump body structure 30, wherein the speed reducer housing 10 has a containing cavity 11 and a pump oil passage 12; the differential assembly 20 is arranged in the containing cavity 11; the pump body structure 30 is arranged on the pump oil passage 12; wherein the pump oil passage 12 has a main oil passage 121 and a branch oil passage 122, a first end of the main oil passage 121 is communicated with a lubricating oil pool of the electric drive system, a second end of the main oil passage 121 is communicated with at least one of a motor cooling area and a motor lubricating area of the electric drive system; the branch oil passage 122 is used for communicating the main oil passage 121 and the containing cavity 11, so as to introduce part of the lubricating oil in the lubricating oil pool into the containing cavity 11 to lubricate and / or cool the differential assembly 20.

[0028] By setting the pump oil circuit 12 into a structure form comprising a main oil circuit 121 and a branch oil circuit 122, at the same time, the first end of the main oil circuit 121 is in communication with the lubricating oil pool of the electric drive system, the second end of the main oil circuit 121 is in communication with at least one of the motor cooling area and the motor lubrication area of the electric drive system, ensuring that the lubricating oil in the lubricating oil pool flows into at least one of the motor cooling area and the motor lubrication area of the electric drive system under the pumping delivery of the pump body structure 30, thereby achieving the purpose of cooling the cooling parts of the motor cooling area and the purpose of lubricating the lubrication parts of the motor lubrication area, in addition, the branch oil circuit 122 communicates the main oil circuit 121 and the containing cavity 11, so that part of the lubricating oil in the lubricating oil pool is introduced into the containing cavity 11, thereby achieving the purpose of active lubrication and active cooling of the differential assembly 20 without changing the overall peripheral size of the electric drive system, in addition, the overall structure of the electric drive system is relatively compact, so that the electric drive system provided by the present application does not affect the normal arrangement of the new energy vehicle.

[0029] As shown in Figure 2 and Figure 3 , at least part of the branch oil circuit 122 is located in the containing cavity 11 and is in communication with the containing cavity 11, and the end of the branch oil circuit 122 away from the differential assembly 20 is in communication with the main oil circuit 121. In this way, the communication reliability of the branch oil circuit 122 with the containing cavity 11 is ensured, and the branch oil circuit 122 can spray lubricating oil into the differential assembly 20 as much as possible, thereby achieving active lubrication and active cooling of the differential assembly 20.

[0030] As shown in Figure 3 , the passage wall surface of the main oil circuit 121 is provided with a first communication hole 1211, and the first communication hole 1211 extends along the radial direction of the main oil circuit 121 and penetrates the inner wall surface and the outer wall surface of the passage of the main oil circuit 121, and the branch oil circuit 122 communicates with the main oil circuit 121 through the first communication hole 1211. In this way, the communication reliability of the branch oil circuit 122 with the main oil circuit 121 is ensured.

[0031] As shown in Figure 3 , the branch oil circuit 122 is located below the main oil circuit 121. In this way, part of the lubricating oil in the main oil circuit 121 is introduced into the containing cavity 11 at least under the action of its own gravity through the first communication hole 1211, thereby achieving active lubrication and active cooling of the differential assembly 20.

[0032] It should be noted that in the present application, at least one of the passage wall surface and the passage end of the branch oil circuit 122 located in the containing cavity 11 is provided with an oil injection hole 1221. In this way, by setting the oil injection hole 1221, it is ensured that the oil injection hole 1221 can align the differential assembly 20 as much as possible and actively lubricate and cool it.

[0033] It should be noted that in the present application, the hole section of the oil injection hole 1221 has a smaller cross-sectional area than the channel section of the branch oil passage 122. In this way, it is ensured that the oil injection hole 1221 can spray lubricating oil at a certain pressure.

[0034] As shown in Figures 1 to 3 , the accommodation cavity 11 includes a gear chamber 111 and a bearing chamber 112 that are in communication; the differential assembly 20 includes a gear engagement set 21 and a support bearing 22, the support bearing 22 is used to support the gear engagement set 21, the gear engagement set 21 is located in the gear chamber 111, and the support bearing 22 is located in the bearing chamber 112; the oil injection hole 1221 located on the passage wall surface is arranged towards the gear chamber 111 to spray oil into the gear chamber 111, and the oil injection hole 1221 located at the end of the passage is arranged towards the bearing chamber 112 to spray oil into the bearing chamber 112. In this way, by arranging the accommodation cavity 11 in the form of a structure including a gear chamber 111 and a bearing chamber 112 that are in communication, the accommodation reliability of the gear chamber 111 for the gear engagement set 21 is ensured, and the accommodation reliability of the bearing chamber 112 for the support bearing 22 is ensured. In addition, by arranging the oil injection hole 1221 located on the passage wall surface in the form of a structure towards the gear chamber 111, it is ensured that the oil injection hole 1221 at this position effectively sprays oil into the gear chamber 111, and by arranging the oil injection hole 1221 located at the end of the passage in the form of a structure towards the bearing chamber 112, it is ensured that the bearing chamber 112 is effectively sprayed.

[0035] As shown in Figure 2 and Figure 3 , the reducer housing 10 also has an assembly groove 13, the assembly groove 13 is located below the main oil passage 121, and the main oil passage 121 communicates with the assembly groove 13 through the first communication hole 1211; the branch oil passage 122 includes a first pipe segment 1222, a transition pipe segment 1223, and a second pipe segment 1224, wherein the first end of the first pipe segment 1222 extends into the assembly groove 13 and communicates with the main oil passage 121 through the assembly groove 13 and the first communication hole 1211 in sequence; the first end of the transition pipe segment 1223 is connected with the first pipe segment 1222, and the second end of the transition pipe segment 1223 extends towards the accommodation cavity 11 in a bent manner; the first end of the second pipe segment 1224 is connected with the second end of the transition pipe segment 1223, and the second end of the second pipe segment 1224 forms a passage end, the second end of the second pipe segment 1224 has an oil injection hole 1221, and the oil injection hole 1221 is formed on the pipe wall of the second pipe segment 1224. In this way, by arranging the branch oil passage 122 in the form of a structure including a first pipe segment 1222, a transition pipe segment 1223, and a second pipe segment 1224, it is ensured that the branch oil passage 122 is introduced into the accommodation cavity 11 in a limited space, thereby realizing the active lubrication and active cooling reliability of the differential assembly 20 located in the accommodation cavity 11.

[0036] It should be noted that, in the present application, the connection between the first pipe section 1222 and the transition pipe section 1223 is smoothly transitioned; and / or, the connection between the transition pipe section 1223 and the second pipe section 1224 is smoothly transitioned.

[0037] It should be noted that, in the present application, the first pipe section 1222, the transition pipe section 1223, and the second pipe section 1224 are sequentially connected in a V-shaped structure. In this way, it is beneficial to the miniaturization design of the electric drive system, and ensures the compactness of the structure of the electric drive system. The branch oil circuit 122 is arranged in a V-shaped structure in the limited space, fully utilizes the limited space of the electric drive system, and at the same time, the main trunk oil circuit 121 and the containing cavity 11 are communicated through the branch oil circuit 122.

[0038] The technical scheme of the utility model provides an electric drive system, including reducer casing 10, differential assembly 20 and pump body structure 30, wherein, reducer casing 10 has containing cavity 11 and pump oil circuit 12;Differential assembly 20 is arranged in containing cavity 11;Pump body structure 30 is arranged on pump oil circuit 12;Wherein, pump oil circuit 12 has main trunk oil circuit 121 and branch oil circuit 122, the first end of main trunk oil circuit 121 is communicated with the lubricating oil pool of electric drive system, and the second end of main trunk oil circuit 121 is communicated with at least one of motor cooling area and motor lubrication area of electric drive system;Branch oil circuit 122 is used to communicate main trunk oil circuit 121 and containing cavity 11, to introduce part of lubricating oil in lubricating oil pool into containing cavity 11 to lubricate and / or cool differential assembly 20.

[0039] By setting pump oil circuit 12 into the structural form including main trunk oil circuit 121 and branch oil circuit 122, at the same time, the first end of main trunk oil circuit 121 is communicated with the lubricating oil pool of electric drive system, and the second end of main trunk oil circuit 121 is communicated with at least one of motor cooling area and motor lubrication area of electric drive system, ensure that the lubricating oil in the lubricating oil pool flows into at least one of motor cooling area and motor lubrication area of electric drive system under the pumping delivery of pump body structure 30, so as to realize the purpose of cooling the cooling part of motor cooling area and the purpose of lubricating the lubrication part of motor lubrication area, in addition, branch oil circuit 122 communicates main trunk oil circuit 121 and containing cavity 11, so that part of lubricating oil in the lubricating oil pool is introduced into containing cavity 11, thereby realizing the purpose of active lubrication and active cooling of differential assembly 20 without changing the overall peripheral size of electric drive system, in addition, the overall structure of electric drive system is relatively compact, so that the electric drive system provided by the present application does not affect the normal arrangement of new energy vehicles.

[0040] It should be noted that in the present application, the gear meshing group 21 and the supporting bearing 22 of the differential assembly 20 are respectively actively lubricated and actively cooled, so that the lubrication is more sufficient, and is not limited and affected by the cavity volume of the electric drive system, the gear oil amount, the oil guide rib and oil channel design, the vehicle driving speed, the slope and the inclination; further, the pump oil circuit 12 is set to a structure including a main oil circuit 121 and a branch oil circuit 122, so that the branch oil circuit 122 leads to the differential assembly 20, and the gear meshing group 21 of the differential assembly 20 is actively lubricated and actively cooled, the lubrication of the gear meshing group 21 is not affected by environmental factors, and the gear meshing group 21 is fully lubricated under any working condition without difference, and the external size of the electric drive system is not changed, the vehicle arrangement is not affected, and the structure is more compact; further, the branch oil circuit 122 of the pump oil circuit 12 leads to the supporting bearing 22, and the supporting bearing 22 is actively lubricated, the lubrication of the supporting bearing 22 is not affected by external factors, and the supporting bearing 22 can be fully lubricated under any working condition, and the supporting bearing 22 is actively lubricated by fully utilizing the oil circuit structure.

[0041] The electric drive system provided in the present application is equipped with an electronic oil pump, and can be actively sprayed by the pump body structure 30 (oil pump) to pump oil, and the lubrication effect is greatly improved compared with the water-cooled electric drive. The pump oil circuit 12 is set to a structure including a main oil circuit 121 and a branch oil circuit 122, the branch oil circuit 122 leads to the gear meshing group 21 and the supporting bearing 22, the gear meshing group 21 and the supporting bearing 22 are respectively actively supplied with oil, and the overall external size of the electric drive system is not changed, the internal space of the electric drive system is fully utilized, the vehicle arrangement is not affected, and is not affected by the cavity volume of the electric drive system, the gear oil amount, the oil guide rib and oil channel design, the vehicle driving speed, different slopes and inclination conditions.

[0042] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0043] The foregoing summary, as well as the following detailed description of the application, will be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the application, there is shown in the drawings embodiments which are presently preferred. It should be understood, however, that the application is not limited to the embodiments specifically illustrated herein, but includes any and all embodiments which come within the scope of the claims. In the drawings: Like reference numerals refer to like elements throughout. The various embodiments of the application will be described in conjunction with the appended drawings, in which like numerals denote like elements and in which: FIG. 1 is a perspective view of a first embodiment of a device according to the present application;

[0044] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "vertical", "horizontal", "top", "bottom", and derivatives thereof shall relate to the application as it is oriented in the drawing figures. However, it is to be understood that the application can assume various alternative orientations and, accordingly, such terms are not to be taken as limitations of the present application, except where so expressly defined by the patentee. All such terms are to be interpreted in the manner in which the term is broadly understood by those of skill in the relevant art and / or in the contexts in which it is used in the specification.

[0045] It is to be understood that the terminology used herein is for the purpose of describing the particular embodiments of the application only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0046] It is to be understood that the terminology used herein is for the purpose of describing the particular embodiments of the application only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0047] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electric drive system, characterized by The electric drive system comprises: a reducer housing (10) having a containing cavity (11) and a pump oil passage (12); a differential assembly (20) arranged in the containing cavity (11); a pump body structure (30) arranged on the pump oil passage (12); wherein the pump oil passage (12) has a main trunk oil passage (121) and a branch oil passage (122), a first end of the main trunk oil passage (121) is communicated with a lubricating oil pool of an electric drive system, a second end of the main trunk oil passage (121) is communicated with at least one of a motor to be cooled region and a motor to be lubricated region of the electric drive system; the branch oil passage (122) is used for communicating the main trunk oil passage (121) and the containing cavity (11) to introduce part of lubricating oil in the lubricating oil pool into the containing cavity (11) to lubricate and / or cool the differential assembly (20).

2. The electric drive system of claim 1, wherein, At least part of the branch oil passage (122) is located in the containing cavity (11) and communicated with the containing cavity (11), and an end of the branch oil passage (122) away from the differential assembly (20) is communicated with the main trunk oil passage (121).

3. The electric drive system according to claim 1, wherein a first communication hole (1211) is arranged on a passage wall surface of the main trunk oil passage (121), and the first communication hole (1211) extends along a radial direction of the main trunk oil passage (121) and penetrates through an inner wall surface and an outer wall surface of the passage of the main trunk oil passage (121), and the branch oil passage (122) is communicated with the main trunk oil passage (121) through the first communication hole (1211).

4. The electric drive system of claim 3, wherein, The branch oil passage (122) is located below the main trunk oil passage (121).

5. The electric drive system of claim 3, wherein, An oil injection hole (1221) is arranged on at least one of a passage wall surface and a passage end of the branch oil passage (122) located in the containing cavity (11).

6. The electric drive system of claim 5, wherein, An area of a hole section of the oil injection hole (1221) is smaller than an area of a passage section of the branch oil passage (122).

7. The electric drive system according to claim 5, wherein the containing cavity (11) comprises a gear cavity (111) and a bearing cavity (112) communicated with each other; the differential assembly (20) comprises a gear meshing group (21) and a support bearing (22) for supporting the gear meshing group (21), the gear meshing group (21) is located in the gear cavity (111), and the support bearing (22) is located in the bearing cavity (112); the oil injection hole (1221) located on the passage wall surface is arranged towards the gear cavity (111) to inject oil into the gear cavity (111), and the oil injection hole (1221) located on the passage end is arranged towards the bearing cavity (112) to inject oil into the bearing cavity (112).

8. The electric drive system according to claim 5, wherein The reducer housing (10) further has an assembly groove (13) located below the main trunk oil passage (121) in communication with the assembly groove (13) through the first communication hole (1211); The branch oil passage (122) comprises: A first pipe section (1222) having a first end extending into the assembly groove (13) and in turn communicating with the main trunk oil passage (121) through the assembly groove (13) and the first communication hole (1211); A transition pipe section (1223) having a first end connected with the first pipe section (1222) and a second end extending towards the accommodating cavity (11) in a bent shape; A second pipe section (1224) having a first end connected with the second end of the transition pipe section (1223) and a second end forming a passage end portion, the second end of the second pipe section (1224) having the oil injection hole (1221) and the oil injection hole (1221) being formed in a pipe wall of the second pipe section (1224).

9. The electric drive system of claim 8, wherein: a connection between the first pipe section (1222) and the transition pipe section (1223) is smoothly transitioned; and / or a connection between the transition pipe section (1223) and the second pipe section (1224) is smoothly transitioned.

10. The electric drive system of claim 8, wherein, The first pipe section (1222), the transition pipe section (1223), and the second pipe section (1224) are sequentially connected in a V-shaped structure.

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