Power assembly and method for assembling power assembly

Abstract

The present application provides a power assembly and a method for assembling a power assembly, the power assembly comprising: a main housing, which is provided with a first mounting hole; a rear cover, which is provided with a second mounting hole and an assembling hole, the assembling hole being used for matching with an assembling tool, so as to mount the rear cover on one side of the main housing, and a containing cavity being formed by the rear cover and the main housing; and a motor shaft, which is mounted in the containing cavity, two ends of the motor shaft in the length direction being movably inserted into the first mounting hole and the second mounting hole, respectively. By means of the described arrangement, the motor shaft can be rapidly assembled between the main housing and the rear cover by matching the assembling hole with the assembling tool, thus omitting the step of matching the assembling tool with a cover plate, and reducing the process of assembling, which facilitates improvement in the efficiency of assembling the power assembly. Also, by omitting the cover plate, the number of parts of the power assembly is reduced, and the size in the axial length of the power assembly and the weight of the power assembly are effectively reduced, leading to a more compact structure of the power assembly.

Description

Powertrain and powertrain assembly method

[0001] This application claims priority to Chinese patent application No. 202311812739.8, filed on December 25, 2023, entitled “Powertrain and Powertrain Assembly Method,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the technical field of power systems, and in particular to a powertrain and a powertrain assembly method. Background Art

[0003] The hybrid transmission is an important powertrain in hybrid vehicles. It can couple the power of the engine and the drive motor in a certain way to achieve the purpose of speed and torque change, and regulate and transmit the engine output power.

[0004] A common hybrid transmission structure includes: a main housing, a motor shaft, a motor room rear cover and a cover plate. The motor shaft is assembled between the main housing and the motor room rear cover. The cover plate is located on the side of the motor room rear cover facing away from the main housing. The cover plate is provided with an oil circuit and a sealing structure. The setting of the cover plate can simplify the structure of the motor room rear cover.

[0005] However, this structure increases the axial size and weight of the hybrid transmission, increases the space occupied by the hybrid transmission in the vehicle, and is not conducive to streamlining the size and weight of the vehicle; in addition, the assembly tooling needs to cooperate with the cover plate to press the motor shaft into the main housing, which increases the assembly steps and affects the assembly efficiency of the hybrid transmission.

[0006] Summary of the Invention

[0007] In view of this, the present application provides a powertrain and a powertrain assembly method to improve the assembly efficiency of the powertrain.

[0008] Specifically, the following technical solutions are included:

[0009] In a first aspect, an embodiment of the present application provides a powertrain, including:

[0010] The main housing is provided with a first mounting hole;

[0011] The rear cover is provided with a second mounting hole and an assembly hole, wherein the assembly hole is used to cooperate with an assembly tool so as to mount the rear cover on one side of the main shell, and the rear cover and the main shell are surrounded to form an accommodating cavity;

[0012] The motor shaft is installed in the accommodating cavity, and both ends of the motor shaft in the length direction are movably inserted into the first mounting hole and the second mounting hole respectively.

[0013] In some embodiments, the powertrain further includes a first bearing and a second bearing, wherein the first bearing and the second bearing are respectively mounted on both ends of the motor shaft in the length direction, the first bearing is mounted in the first mounting hole, and the second bearing is mounted in the second mounting hole.

[0014] In some embodiments, the power assembly also includes a bearing retaining ring, the main housing is provided with a retaining ring groove connected to the first mounting hole, the bearing retaining ring is installed in the retaining ring groove and is sleeved on one end of the motor shaft, and the bearing retaining ring is adjacent to the first bearing.

[0015] In some embodiments, there are multiple assembly holes, and the multiple assembly holes are distributed at intervals on the back cover.

[0016] In some embodiments, the assembly hole is communicated with the second mounting hole, so that the assembly tool passes through the assembly hole and abuts against the end surface of the motor shaft.

[0017] In some embodiments, the power assembly further includes a blocking member configured to block the assembly hole.

[0018] In some embodiments, the blocking member is threadedly connected to the assembly hole.

[0019] In some embodiments, the motor shaft includes a sidewall and an inner cavity formed by the sidewall, a branch oil passage is opened on the sidewall, an extension direction of the branch oil passage forms an angle with the axial direction of the motor shaft, and the branch oil passage passes through the sidewall and is connected to the inner cavity;

[0020] The rear cover is provided with an oil passage, and the oil passage is communicated with the inner cavity.

[0021] In a second aspect, an embodiment of the present application provides a powertrain assembly method, which is applied to the powertrain described in any embodiment of the first aspect, and the powertrain assembly method includes:

[0022] Assemble the first end of the motor shaft into the second mounting hole of the rear cover;

[0023] Inserting an assembly tool into the assembly hole, and installing the second end of the motor shaft into the first mounting hole of the main housing through the assembly tool;

[0024] separating the assembly tool from the back cover;

[0025] Connect the main housing to the rear cover.

[0026] In some embodiments, the powertrain further includes a first bearing and a second bearing;

[0027] Before assembling the first end of the motor shaft into the second mounting hole of the rear cover, the powertrain assembly method further includes:

[0028] Installing the first bearing in the first mounting hole;

[0029] Install the second bearing in the second mounting hole.

[0030] In some embodiments, the power assembly further includes a bearing snap ring, and the main housing is provided with a snap ring groove communicating with the first mounting hole;

[0031] After installing the first bearing in the first mounting hole, the powertrain assembly method further includes:

[0032] The bearing snap ring is installed in the snap ring groove so that the bearing snap ring is adjacent to the first bearing.

[0033] In some embodiments, the assembly hole is in communication with the second mounting hole, and the power assembly further includes a blocking member;

[0034] After separating the assembly tool from the rear cover, the powertrain assembly method further includes:

[0035] The blocking piece is inserted into the assembly hole.

[0036] The beneficial effects of the technical solution provided by the embodiment of the present application include at least: by setting an assembly hole on the rear cover, the assembly hole can be used in conjunction with the assembly tool to quickly assemble the motor shaft between the main housing and the rear cover, eliminating the step of coordinating the assembly tool with the cover plate, reducing the assembly process, and helping to improve the assembly efficiency of the powertrain; at the same time, by eliminating the cover plate, the number of parts of the powertrain is reduced, the axial length and weight of the powertrain are effectively reduced, and the structure of the powertrain is more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] FIG1 is a schematic diagram of the assembly of a powertrain according to an embodiment of the present application;

[0039] FIG2 is a cross-sectional view of a powertrain according to an embodiment of the present application;

[0040] FIG3 is a second cross-sectional view of the powertrain according to an embodiment of the present application;

[0041] FIG4 is a schematic flow chart of a powertrain assembly method according to one embodiment of the present application;

[0042] FIG5 is a schematic flow chart of a powertrain assembly method according to a second embodiment of the present application;

[0043] FIG6 is a flow chart of a powertrain assembly method according to a third embodiment of the present application.

[0044] The reference numerals in the figure are respectively represented as: 1-main housing; 11-accommodating chamber; 12-first mounting hole; 13-retaining ring groove; 2-rear cover; 21-oil channel; 22-oil inlet hole; 23-second mounting hole; 24-assembly hole; 3-motor shaft; 31-inner cavity; 32-side wall; 321-branch oil channel; 41-first bearing; 42-second bearing; 5-bearing retaining ring; 6-stator; 7-rotor; 8-sealing part; 100-assembly tooling; 101-elevator pin.

[0045] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] The directional terms used in the embodiments of this application, such as "upper," "lower," and "side," are generally based on the relative positions shown in Figure 1. These directional terms are used only to more clearly describe the relationships between structures and are not intended to describe absolute positions. When the product is placed in different postures, the position may change; for example, "upper" and "lower" may be interchangeable.

[0048] Unless otherwise defined, all technical terms used in the examples of this application have the same meanings as those commonly understood by those skilled in the art. Some technical terms that appear in the examples of this application are explained below.

[0049] In order to make the technical solutions and advantages of the present application clearer, the implementation methods of the present application will be described in further detail below with reference to the accompanying drawings.

[0050] As shown in Figures 1 to 3, an embodiment of the present application provides a power assembly, including a main housing 1, a rear cover 2 and a motor shaft 3.

[0051] The main housing 1 is provided with a first mounting hole 12. The rear cover 2 is provided with a second mounting hole 23 and an assembly hole 24. The assembly hole 24 is used to cooperate with the assembly tool 100 to mount the rear cover 2 on one side of the main housing 1. The rear cover 2 and the main housing 1 are surrounded by a receiving cavity 11.

[0052] The motor shaft 3 is mounted within the accommodating cavity 11, with its longitudinal ends movably inserted into the first mounting hole 12 and the second mounting hole 23. The rear cover 2 and the main housing 1 are joined along the length of the motor shaft 3 to enclose and form the accommodating cavity 11, confining the motor shaft 3 within the accommodating cavity 11.

[0053] For example, the powertrain is a hybrid transmission. When the powertrain is assembled, the first mounting hole 12 and the second mounting hole 23 are coaxially spaced along the length of the motor shaft 3. The first mounting hole 12 and the second mounting hole 23 can be circular, rectangular, or other polygonal shapes.

[0054] The power assembly also includes a stator 6 and a rotor 7 installed in the accommodating cavity 11. The rotor 7 is sleeved on the outside of the motor shaft 3, and the stator 6 is arranged around the outer periphery of the rotor 7. Under the cooperation of the stator 6 and the rotor 7, the motor shaft 3 can rotate around its own central axis.

[0055] The assembly hole 24 extends along the thickness direction of the rear cover 2. As shown in Figure 1, the assembly tool 100 is provided with a push pin 101, which can be inserted into the assembly hole 24, so that the assembly tool 100 moves the rear cover 2 and presses the rear cover 2 onto the end face of the main shell 1 to complete the assembly of the powertrain.

[0056] Conventional hybrid transmissions typically include a main housing, a motor shaft, a motor compartment rear cover, and a cover plate. The cover plate is mounted on the side of the motor compartment rear cover facing away from the main housing and is equipped with an oil circuit and a sealing structure. During assembly, the assembly tool 100 must engage the cover plate, abutting the motor shaft and moving the motor shaft for installation in the main housing. The installation of the cover plate increases the axial size and weight of the hybrid transmission, adds to the assembly process, and reduces assembly efficiency.

[0057] The powertrain provided in the embodiment of the present application, by providing an assembly hole 24 on the rear cover 2, can utilize the assembly hole 24 to cooperate with the assembly tool 100 to quickly assemble the motor shaft 3 between the main housing 1 and the rear cover 2, eliminating the step of cooperating the assembly tool 100 with the cover plate, reducing the assembly process, and helping to improve the assembly efficiency of the powertrain; at the same time, by eliminating the cover plate, the number of parts of the powertrain is reduced, the axial length and weight of the powertrain are effectively reduced, and the structure of the powertrain is more compact.

[0058] In a further embodiment, as shown in Figure 2, the power assembly also includes a first bearing 41 and a second bearing 42, and the first bearing 41 and the second bearing 42 are respectively mounted on both ends of the length direction of the motor shaft 3, the first bearing 41 is installed in the first mounting hole 12, and the second bearing 42 is installed in the second mounting hole 23.

[0059] Illustratively, the first bearing 41 and the second bearing 42 are rolling bearings such as deep groove ball bearings, cylindrical roller bearings, and needle bearings, which are used to carry radial loads, support the motor shaft 3 and reduce rotational friction to ensure normal rotation of the motor shaft 3.

[0060] For example, clearance fit is adopted between the first bearing 41 and the main housing 1 , and between the second bearing 42 and the rear cover 2 , so as to store lubricating oil and compensate for errors.

[0061] For example, interference fit is adopted between the first bearing 41 and the motor shaft 3 , and between the second bearing 42 and the motor shaft 3 , so the connection tightness is high and it is not easy to fall off.

[0062] Optionally, the shape and size of the first mounting hole 12 are respectively adapted to the shape and size of the first bearing 41, and the shape and size of the second mounting hole 23 are respectively adapted to the shape and size of the second bearing 42. For example, the outer contours of the first mounting hole 12 and the second mounting hole 23 are circular, identical to the outer contours of the first bearing 41 and the second bearing 42. The radial dimension of the first mounting hole 12 is equal to or slightly larger than the radial dimension of the first bearing 41, and the radial dimension of the second mounting hole 23 is equal to or slightly larger than the radial dimension of the second bearing 42.

[0063] Exemplarily, in this embodiment, the assembly process of the powertrain includes: assembling the first bearing 41 into the first mounting hole 12; pressing the second bearing 42 onto the motor shaft 3, and assembling the motor shaft 3 and the second bearing 42 as a whole into the second mounting hole 23; inserting the ejector pin 101 of the assembly tool 100 into the assembly hole 24, moving the rear cover 2, the motor shaft 3 and the second bearing 42 as a whole, and assembling the motor shaft 3 into the first mounting hole 12; and connecting the rear cover 2 and the main housing 1 by bonding, interference fit, fastener connection, etc.

[0064] In a further embodiment, the power assembly also includes a bearing retaining ring 5, the main housing 1 is provided with a retaining ring groove 13 connected to the first mounting hole 12, the bearing retaining ring 5 is installed in the retaining ring groove 13 and is sleeved on one end of the motor shaft 3, and the bearing retaining ring 5 is adjacent to the first bearing 41.

[0065] Exemplarily, the bearing retaining ring 5 is made of spring steel, stainless steel or other materials.

[0066] Illustratively, the snap ring groove 13 is located on the side of the first mounting hole 12 close to the rear cover 2 , so that the bearing snap ring 5 is located on the side of the first bearing 41 close to the second bearing 42 , as shown in FIG. 2 , and the bearing snap ring 5 abuts against the first bearing 41 .

[0067] By providing the bearing retaining ring 5 , the correct positioning of the first bearing 41 during operation can be ensured, the stability of the first bearing 41 can be improved, and the axial movement of the first bearing 41 causing excessive vibration or wear can be prevented, thereby avoiding affecting the life of the first bearing 41 .

[0068] Exemplarily, in this embodiment, the assembly process of the powertrain includes: assembling the first bearing 41 into the first mounting hole 12; assembling the bearing retaining ring 5 into the retaining ring groove 13; press-fitting the second bearing 42 onto the motor shaft 3, and integrally assembling the motor shaft 3 and the second bearing 42 into the second mounting hole 23; inserting the ejector pin 101 of the assembly tool 100 into the assembly hole 24, moving the rear cover 2, the motor shaft 3 and the second bearing 42 as a whole, and assembling the motor shaft 3 into the first mounting hole 12; and connecting the rear cover 2 and the main housing 1 by means of plug-in connection, fastener connection, etc.

[0069] In a specific embodiment, there are multiple assembly holes 24 , which are spaced apart on the back cover 2 to improve the connection stability between the assembly tool 100 and the back cover 2 .

[0070] For example, there are three assembly holes 24, which are spaced apart around the second mounting hole 23. The assembly holes 24 may be circular, rectangular, triangular, or other polygonal shapes. Optionally, the shape and size of the assembly holes 24 match the shape and size of the ejector pin 101 of the assembly tool 100.

[0071] The assembly hole 24 can be a blind hole or a through hole. For example, the assembly hole 24 is connected to the second mounting hole 23 so that the assembly tool 100 passes through the assembly hole 24 and abuts against the end surface of the motor shaft 3.

[0072] In this embodiment, the ejector pin 101 of the assembly tool 100 can pass through the assembly hole 24 and abut against the end face of the motor shaft 3, thereby directly pressing the motor shaft 3 into the first mounting hole 12, which is beneficial to improving the connection tightness, connection stability and reliability between the motor shaft 3 and the main housing 1, reducing the difficulty of assembly and improving assembly efficiency.

[0073] In a further embodiment, the power assembly further includes a blocking member 8 , which is used to block the assembly hole 24 .

[0074] Specifically, the blocking member 8 is used to block the assembly hole 24 after the motor shaft 3 is assembled, thereby improving the sealing performance of the power assembly and preventing the lubricating oil in the accommodating cavity 11 from leaking from the assembly hole 24 .

[0075] Exemplarily, the shape and size of the blocking member 8 match those of the assembly hole 24 , so that the blocking member 8 shown in FIG. 2 can be tightly inserted into the assembly hole 24 and firmly connected to the rear cover 2 .

[0076] The blocking member 8 can be connected to the assembly hole 24 by bonding, welding, interference fit, or the like.

[0077] In an optional embodiment, the blocking member 8 is threadedly connected to the assembly hole 24 .

[0078] Specifically, the sealing member 8 includes a connected nut portion and a screw body portion, the outer wall of the screw body portion is provided with an external thread, and the assembly hole 24 is provided with an internal thread adapted to the external thread. With the cooperation of the external thread and the internal thread, the screw body portion can be screwed into the assembly hole 24 until the nut portion abuts against the side surface of the back cover 2 facing away from the accommodating cavity 11, thereby completing the sealing of the assembly hole 24 by the sealing member 8.

[0079] It can be understood that when there are multiple assembly holes 24 , there are also multiple blocking pieces 8 , and each assembly hole 24 is equipped with a blocking piece 8 .

[0080] Based on any of the above embodiments, the motor shaft 3 includes a side wall 32 and an inner cavity 31 surrounded by the side wall 32, and a branch oil passage 321 is opened on the side wall 32. The extension direction of the branch oil passage 321 has an angle with the axial direction of the motor shaft 3, and the branch oil passage 321 passes through the side wall 32 and is connected to the inner cavity 31; as shown in Figure 3, the rear cover 2 is provided with an oil passage 21, and the oil passage 21 is connected to the inner cavity 31.

[0081] The inner cavity 31 extends along the axial direction of the motor shaft 3. There are one or more branch oil passages 321, and the oil outlet end of at least one branch oil passage 321 leads to the accommodating cavity 11. The branch oil passage 321 can extend in the radial direction of the motor shaft 3 or in a direction oblique to the axial direction of the motor shaft 3.

[0082] For example, the rear cover 2 is provided with an oil inlet hole 22, through which the lubricating oil can enter the oil channel 21 and flow into the inner cavity 31. During the rotation and throwing process of the motor shaft 3, the lubricating oil in the inner cavity 31 flows out through the branch oil path 321 under the action of centrifugal force and sprays on the surfaces of components such as bearings, stators 6, and rotors 7 to cool and lubricate them.

[0083] The present application also provides a powertrain assembly method, which is applicable to the powertrain provided in any of the above embodiments. As shown in FIG4 , the powertrain assembly method includes:

[0084] S1: Assemble the first end of the motor shaft 3 into the second mounting hole 23 of the rear cover 2;

[0085] S2: Insert the assembly tool 100 into the assembly hole 24, and install the second end of the motor shaft 3 into the first mounting hole 12 of the main housing 1 through the assembly tool 100;

[0086] S3: Separate the assembly tool 100 from the back cover 2;

[0087] S4: Connect the main housing 1 and the rear cover 2.

[0088] For example, the assembly tool 100 is provided with a push pin 101. In step S2, the push pin 101 is inserted into the assembly hole 24 to move the rear cover 2 and press-fit it onto the end surface of the main housing 1. In step S3, the push pin 101 is disengaged from the assembly hole 24 to separate the assembly tool 100 from the rear cover 2.

[0089] It can be understood that the first end and the second end of the motor shaft 3 are two end portions in the length direction of the motor shaft 3 .

[0090] For example, in step S4 , the main housing 1 and the rear cover 2 may be connected by bonding, interference fit, fastener connection, or the like.

[0091] In the prior art, a hybrid transmission typically consists of a main housing, a motor shaft, a motor compartment rear cover, and a cover plate. The cover plate is mounted on the side of the motor compartment rear cover facing away from the main housing and is equipped with an oil circuit and a sealing structure. During assembly, the assembly tool 100 must engage the cover plate, abutting the motor shaft and moving the motor shaft for installation in the main housing. The installation of the cover plate increases the axial size and weight of the hybrid transmission, adds to the assembly process, and reduces assembly efficiency.

[0092] The powertrain assembly method provided in the embodiment of the present application can utilize the assembly hole 24 to cooperate with the assembly tool 100 to quickly assemble the motor shaft 3 between the main housing 1 and the rear cover 2, eliminating the step of cooperating the assembly tool 100 with the cover plate, reducing the assembly process, and helping to improve the assembly efficiency of the powertrain; at the same time, by eliminating the cover plate, the number of parts of the powertrain is reduced, the axial length and weight of the powertrain are effectively reduced, and the structure of the powertrain is more compact.

[0093] In a further embodiment, the power assembly further includes a first bearing 41 and a second bearing 42. The first bearing 41 and the second bearing 42 are respectively sleeved on both ends of the motor shaft 3 in the longitudinal direction, and are used to bear radial loads, support the motor shaft 3 and reduce rotational friction, thereby ensuring normal rotation of the motor shaft 3.

[0094] As shown in FIG5 , before assembling the first end of the motor shaft 3 into the second mounting hole 23 of the rear cover 2 in step S1 , the powertrain assembly method further includes:

[0095] S101: Install the first bearing 41 into the first mounting hole 12;

[0096] S102 : Install the second bearing 42 in the second installation hole 23 .

[0097] For example, clearance fit is adopted between the first bearing 41 and the main housing 1 , and between the second bearing 42 and the rear cover 2 , so as to store lubricating oil and compensate for errors.

[0098] For example, interference fit is adopted between the first bearing 41 and the motor shaft 3 , and between the second bearing 42 and the motor shaft 3 , so the connection tightness is high and it is not easy to fall off.

[0099] It is understandable that the execution order of step S101 and step S102 may be step S101 before step S102 or step S102 before step S101.

[0100] In a further embodiment, the powertrain further comprises a bearing snap ring 5, and the main housing 1 is provided with a snap ring groove 13 communicating with the first mounting hole 12. After the first bearing 41 is installed in the first mounting hole 12 in step S101, the powertrain assembly method further comprises:

[0101] S1011 : Install the bearing snap ring 5 into the snap ring groove 13 so that the bearing snap ring 5 is adjacent to the first bearing 41 .

[0102] The bearing retaining ring 5 is used to ensure the correct positioning of the first bearing 41 during operation, improve the stability of the first bearing 41 , prevent the first bearing 41 from axial movement causing excessive vibration or wear, and avoid affecting the life of the first bearing 41 .

[0103] In an optional embodiment, the assembly hole 24 is connected to the second mounting hole 23, and the power assembly further includes a blocking member 8. After the assembly tool 100 is separated from the rear cover 2 in step S3, the power assembly method further includes:

[0104] S301 : inserting the blocking member 8 into the assembly hole 24 .

[0105] In step S301 , after the motor shaft 3 is assembled, the assembly hole 24 is sealed with the sealing member 8 , thereby improving the sealing performance of the power assembly and preventing the lubricating oil in the accommodating cavity 11 from leaking from the assembly hole 24 .

[0106] In an optional embodiment, the blocking member 8 is threadedly connected to the assembly hole 24 .

[0107] Specifically, the sealing member 8 includes a connected nut portion and a screw body portion, the outer wall of the screw body portion is provided with an external thread, and the assembly hole 24 is provided with an internal thread adapted to the external thread. With the cooperation of the external thread and the internal thread, the screw body portion can be screwed into the assembly hole 24 until the nut portion abuts against the side surface of the back cover 2 facing away from the accommodating cavity 11, thereby completing the sealing of the assembly hole 24 by the sealing member 8.

[0108] As shown in FIG6 , in a specific embodiment, the powertrain assembly method includes:

[0109] S101: Install the first bearing 41 into the first mounting hole 12;

[0110] S102: Install the second bearing 42 into the second mounting hole 23;

[0111] S1: Assemble the first end of the motor shaft 3 into the second mounting hole 23 of the rear cover 2;

[0112] S2: Insert the assembly tool 100 into the assembly hole 24, and install the second end of the motor shaft 3 into the first mounting hole 12 of the main housing 1 through the assembly tool 100;

[0113] S3: Separate the assembly tool 100 from the back cover 2;

[0114] S301: Insert the blocking member 8 into the assembly hole 24;

[0115] S4: Connect the main housing 1 and the rear cover 2.

[0116] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless expressly limited otherwise.

[0117] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0118] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the present invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only.

[0119] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A powertrain, the powertrain comprising: A main housing (1) provided with a first mounting hole (12); A rear cover (2) provided with a second mounting hole (23) and an assembly hole (24), the assembly hole (24) being adapted to cooperate with an assembly tooling (100) so as to mount the rear cover (2) on one side of the main housing (1), and the rear cover (2) and the main housing (1) enclosing a receiving cavity (11); A motor shaft (3) mounted in the receiving cavity (11), and two ends in the length direction of the motor shaft (3) being respectively movably inserted into the first mounting hole (12) and the second mounting hole (23).

2. The powertrain according to claim 1, wherein, The powertrain further comprises a first bearing (41) and a second bearing (42), the first bearing (41) and the second bearing (42) being respectively sleeved on two ends in the length direction of the motor shaft (3), the first bearing (41) being mounted in the first mounting hole (12), and the second bearing (42) being mounted in the second mounting hole (23).

3. The powertrain according to claim 2, wherein, The powertrain further comprises a bearing snap ring (5), the main housing (1) being provided with a snap ring groove (13) communicating with the first mounting hole (12), the bearing snap ring (5) being mounted in the snap ring groove (13) and sleeved on one end of the motor shaft (3), and the bearing snap ring (5) being adjacent to the first bearing (41).

4. The powertrain according to any one of claims 1 to 3, wherein, There are a plurality of the assembly holes (24), and the plurality of assembly holes (24) are spaced apart on the rear cover (2).

5. The powertrain according to any one of claims 1 to 4, wherein, The assembly hole (24) communicates with the second mounting hole (23) so that the assembly tooling (100) passes through the assembly hole (24) and abuts against the end face of the motor shaft (3).

6. The powertrain according to claim 5, wherein, The powertrain further comprises a plugging member (8), and the plugging member (8) is used for plugging the assembly hole (24).

7. The powertrain according to claim 6, wherein, The plugging member (8) is threadedly connected to the assembly hole (24).

8. The powertrain according to any one of claims 1 to 7, wherein, The motor shaft (3) comprises a side wall (32) and an inner cavity (31) surrounded by the side wall (32), a branch oil passage (321) is formed in the side wall (32), the extending direction of the branch oil passage (321) has an included angle with the axial direction of the motor shaft (3), the branch oil passage (321) penetrates through the side wall (32) and communicates with the inner cavity (31); The rear cover (2) is provided with an oil passage (21), and the oil passage (21) communicates with the inner cavity (31).

9. A powertrain assembly method, applied to the powertrain according to any one of claims 1 to 8, the powertrain assembly method comprising: Assembling the first end of the motor shaft (3) into the second mounting hole (23) of the rear cover (2); Inserting the assembly tooling (100) into the assembly hole (24), and mounting the second end of the motor shaft (3) into the first mounting hole (12) of the main housing (1) through the assembly tooling (100); Separating the assembly tooling (100) from the rear cover (2); Connecting the main housing (1) and the rear cover (2).

10. The powertrain assembly method according to claim 9, wherein, The powertrain further comprises a first bearing (41) and a second bearing (42); Before assembling the first end of the motor shaft (3) into the second mounting hole (23) of the rear cover (2), the power assembly assembling method further includes: Installing the first bearing (41) into the first mounting hole (12); Installing the second bearing (42) into the second mounting hole (23).

11. The powertrain assembly method according to claim 10, wherein, The power assembly further includes a bearing snap ring (5), and the main housing (1) is provided with a snap ring groove (13) communicating with the first mounting hole (12); After installing the first bearing (41) into the first mounting hole (12), the power assembly assembling method further includes: Installing the bearing snap ring (5) into the snap ring groove (13) so that the bearing snap ring (5) is adjacent to the first bearing (41).

12. The powertrain assembly method according to any one of claims 9 to 11, wherein, The assembly hole (24) communicates with the second mounting hole (23), and the power assembly further includes a plugging member (8); After separating the assembly tooling (100) from the rear cover (2), the power assembly assembling method further includes: Inserting the plugging member (8) into the assembly hole (24).

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