Snap ring, spline mechanism, assembling method of spline mechanism and bridge driving system

Abstract

The invention provides a clamping ring, a spline mechanism, an assembling method of the spline mechanism and a bridge driving system. When the first circumferential end part and the second circumferential end part of the main body part of the clamping ring are in a mutual clamping state, the first circumferential end part and the second circumferential end part only can relatively move towards the direction away from each other or the first circumferential end part and the second circumferential end part only can relatively move towards the direction close to each other. Therefore, the clamping ring is effectively prevented from being unexpectedly separated from the annular clamping groove due to the influence of system work after being installed in place through a relatively simple structure. According to the spline mechanism and the bridge driving system, the clamping ring can limit the axial relative movement between the multi-tooth pieces, in spline fit with each other, of the spline mechanism. By means of the assembling method of the spline mechanism, the clamping ring can be assembled into the annular clamping groove in a relatively simple mode, and therefore the clamping ring can be prevented from unexpectedly disengaging from the annular clamping groove, and meanwhile the corresponding assembling cost is reduced.

Description

Technical Field

[0001] The present application relates to a limiting structure for a transmission mechanism in a power system for a vehicle, and more specifically to a retaining ring, including a spline mechanism of the retaining ring and an assembly method thereof, and an electric bridge drive system including the spline mechanism. Background Art

[0002] The electric bridge drive system is an existing vehicle power system. The electric bridge drive system may include a motor as a power source and a transmission for transmitting the torque of the motor to the outside, and the transmission may include a planetary gear. In a typical solution, the ring gear of the planetary gear and the housing of the electric bridge drive system are assembled together through a spline mechanism so that they cannot rotate relative to each other.

[0003] Furthermore, a retaining ring installed in the annular groove of the housing is used to limit the relative movement of the ring gear and the housing in the axial direction. The retaining ring has an annular shape and is formed with a notch. After being installed in place, the retaining ring may be affected when the electric bridge drive system is in a working state, and there is a risk of the retaining ring escaping from the annular groove. Therefore, technicians have designed a new retaining ring, so that a structural part of a specific shape is formed at the notch of the retaining ring to match the notch of the retaining ring, so as to reduce the risk of the retaining ring escaping from the annular groove. However, such a structural part needs to achieve a more precise shape match with the notch of the retaining ring, which complicates the manufacturing process and the assembly process, thereby significantly increasing the corresponding cost of the retaining ring. Summary of the invention

[0004] This application is made in view of the defects of the above-mentioned prior art. One object of the present application is to provide a retaining ring, which has a relatively simple structure and can effectively prevent the retaining ring from unexpectedly falling out of the annular groove when assembled in, for example, an annular groove of an electric bridge drive system. Another object of the present application is to provide a spline mechanism including the above-mentioned retaining ring and an electric bridge drive system including the above-mentioned spline mechanism. Yet another object of the present application is to provide an assembly method of the above-mentioned spline mechanism.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions.

[0006] The present application provides a snap ring, comprising an annular main body, wherein the main body has a first circumferential end and a second circumferential end, wherein the first circumferential end and the second circumferential end can be snap-fitted to each other.

[0007] When the first circumferential end portion and the second circumferential end portion are in a state of being engaged with each other, the first circumferential end portion and the second circumferential end portion can only move relative to each other in a direction away from each other or the first circumferential end portion and the second circumferential end portion can only move relative to each other in a direction approaching each other.

[0008] In an optional solution, a clamping protrusion is formed at the first circumferential end, a clamping groove is formed at the second circumferential end, the outer wall of the clamping protrusion has a plurality of first clamping teeth, and the inner wall of the clamping groove has a plurality of second clamping teeth.

[0009] When the locking protrusion is inserted into the locking groove, the first locking tooth and the second locking tooth engage with each other, thereby allowing the first circumferential end portion and the second circumferential end portion to move relative to each other only in a direction away from each other or allowing the first circumferential end portion and the second circumferential end portion to move relative to each other only in a direction approaching each other.

[0010] In another optional solution, the first engaging tooth is formed on at least one of the outer circumferential surface and the inner circumferential surface of the engaging protrusion, and the second engaging tooth is formed at a position of the engaging groove corresponding to the first engaging tooth.

[0011] In another optional solution, the two circumferential side surfaces of each of the first engaging teeth extend obliquely toward the side where the second circumferential end portion is located in the process of extending from the tooth root toward the tooth top.

[0012] In another optional embodiment, the axial thickness of the first circumferential end portion and / or the second circumferential end portion is greater than the axial thickness of other parts of the main body, and / or the radial height of the first circumferential end portion and / or the second circumferential end portion is greater than the radial height of other parts of the main body.

[0013] The present application also provides a spline mechanism, comprising:

[0014] A first multi-tooth member having a plurality of first key teeth and formed with an annular groove;

[0015] a second multi-tooth member having a plurality of second key teeth meshed with the plurality of first key teeth; and

[0016] The retaining ring described in any of the above technical solutions, the main body of the retaining ring is installed in the annular groove, used to limit the axial relative movement of the first multi-toothed member and the second multi-toothed member, and the first circumferential end portion and the second circumferential end portion are in an assembled state of being clamped to each other.

[0017] In an optional solution, the plurality of first key teeth constitute an internal spline, the plurality of second key teeth constitute an external spline, and the external spline cooperates with the internal spline.

[0018] The present application also provides an electric bridge drive system, comprising the spline mechanism described in any one of the above technical solutions.

[0019] In an optional solution, it further includes a housing and a planetary gear, the housing serves as the first multi-tooth component, and the planetary gear includes a sun gear, planetary gears, and a ring gear serving as the second multi-tooth component.

[0020] The present application also provides an assembly method of a spline mechanism according to one of the above technical solutions, comprising:

[0021] a first assembling step, wherein the first multi-tooth member and the second multi-tooth member are assembled together so that the first key teeth and the second key teeth are spline-fitted to each other; and

[0022] A second assembly step, wherein when the retaining ring is in a pre-assembled state in which the first circumferential end portion and the second circumferential end portion are engaged with each other, the retaining ring is placed at the position where the annular groove is located, so that the first circumferential end portion and the second circumferential end portion move relative to each other in a direction away from each other, thereby assembling the retaining ring into the annular groove in a state in which the retaining ring maintains the first circumferential end portion and the second circumferential end portion in engagement with each other.

[0023] By adopting the above technical solution, the present application provides a snap ring, which includes an annular main body, the main body extends along the circumferential direction, and the main body has a first circumferential end and a second circumferential end. The second circumferential end can be engaged with the first circumferential end, and when the first circumferential end and the second circumferential end are engaged with each other, the first circumferential end and the second circumferential end can only move relative to each other in a direction away from each other or the first circumferential end and the second circumferential end can only move relative to each other in a direction close to each other. Thus, when the snap ring is assembled in an annular groove of, for example, an electric bridge drive system, since the first circumferential end and the second circumferential end are engaged with each other, the first circumferential end and the second circumferential end can only move relative to each other in a direction away from each other, so the snap ring will not shrink and deform and escape from the annular groove open to the radial inside; or since the first circumferential end and the second circumferential end are engaged with each other, the first circumferential end and the second circumferential end can only move relative to each other in a direction close to each other, so the snap ring will not expand and deform and escape from the annular groove open to the radial outside. Therefore, the snap ring is effectively prevented from unexpectedly coming out of the annular groove due to the influence of system operation after being installed in place with a relatively simple structure. A spline mechanism including the snap ring and an electric bridge drive system including the spline mechanism are also provided. The snap ring can limit the axial relative movement between the multiple toothed parts of the spline mechanism that are spline-matched with each other, and can also achieve the effect of preventing unexpected coming out.

[0024] The present application also provides an assembly method for the above-mentioned spline mechanism that will not shrink in diameter, and the assembly method includes a plurality of steps. Specifically, in the first assembly step, the first multi-toothed member and the second multi-toothed member are assembled together so that the first key teeth and the second key teeth are spline-matched with each other. In the second assembly step, the retaining ring is placed at the position where the annular groove is located when the first circumferential end and the second circumferential end are in a pre-assembled state in which the first circumferential end and the second circumferential end are engaged with each other, and then the first circumferential end and the second circumferential end are moved relative to each other in a direction away from each other, so as to keep the first circumferential end and the second circumferential end in an assembled state in which the first circumferential end and the second circumferential end are engaged with each other and assemble the retaining ring into the annular groove. As a result, the retaining ring can be assembled into the annular groove in a relatively simple manner, thereby reducing the corresponding assembly cost while being able to prevent the retaining ring from unexpectedly falling out of the annular groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1A It is a three-dimensional schematic diagram showing an assembly of a first multi-tooth member (housing), a second multi-tooth member (gear ring) and a retaining ring in an electric bridge drive system according to an embodiment of the present application, wherein the first multi-tooth member, the second multi-tooth member and the retaining ring are in an assembled state.

[0026] Figure 1B It shows Figure 1A An enlarged schematic diagram of the local structure of the assembly.

[0027] Figure 1C It shows Figure 1A A three-dimensional schematic diagram of the second multi-tooth member and the retaining ring of the assembly.

[0028] Figure 1D It shows Figure 1A Schematic diagram of the decomposition structure of the assembly in .

[0029] Figure 2A It shows Figure 1A A three-dimensional schematic diagram of a retaining ring in which the retaining ring is in a pre-assembled state.

[0030] Figure 2B It shows Figure 2A An enlarged schematic diagram of the local structure of the retaining ring.

[0031] Figure 2C It shows Figure 1A A three-dimensional schematic diagram of the retaining ring in the embodiment of the present invention, wherein the retaining ring is in an assembled state.

[0032] Figure 2D It shows Figure 2C An enlarged schematic diagram of the local structure of the retaining ring.

[0033] Description of Reference Numerals

[0034] 1 first multi-toothed member; 11 first main body; 12 first key tooth; 1c annular groove;

[0035] 2 second multi-tooth member; 21 second main body; 22 second key tooth;

[0036] 3 snap ring; 31 main body; 31e1 first circumferential end; 31s1 snap-fit ​​protrusion; 31t1 first snap-fit ​​tooth; 31e2 second circumferential end; 31s2 snap-fit ​​groove; 31t2 second snap-fit ​​tooth. DETAILED DESCRIPTION

[0037] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all feasible methods of the present application, nor to limit the scope of the present application.

[0038] In the present application, “axial direction”, “radial direction” and “circumferential direction” refer to the axial direction, radial direction and circumferential direction of the ring gear, respectively.

[0039] In the present application, "drive connection" refers to two components being connected in a manner capable of transmitting torque, including direct or indirect connection of the two components.

[0040] The structure of an electric bridge drive system and a spline mechanism included therein according to an embodiment of the present application will be described below in conjunction with the accompanying drawings.

[0041] The electric bridge drive system according to an embodiment of the present application may include a motor and a transmission, and the motor and the transmission are transmission-connected, so that the torque of the motor can be transmitted to the outside through the transmission. The transmission can be installed in the housing of the electric bridge drive system and include a planetary gear. Typically, the planetary gear may include a sun gear, a planetary gear, a planetary gear carrier and a ring gear assembled together. The sun gear can be transmission-connected with the motor all the time. A plurality of planetary gears can be located radially outside the sun gear and evenly distributed along the circumference, and each planetary gear is always meshed with the sun gear, so that as the sun gear rotates, each planetary gear can rotate around its own central axis and revolve around the sun gear. The planetary gear carrier is located radially outside the sun gear, and a plurality of planetary gears are installed on the planetary gear carrier, and the planetary gear carrier can transmit torque to the outside and receive torque from the outside. The rotation of the planetary gear carrier can drive the plurality of planetary gears to revolve, and the revolution of the plurality of planetary gears can also drive the planetary gear carrier to rotate. The ring gear is located radially outside the plurality of planetary gears, and a track for the plurality of planetary gears to revolve is formed between the ring gear and the sun gear, and the ring gear is always meshed with the plurality of planetary gears.

[0042] Furthermore, if Figures 1A to 1DAs shown, in an electric bridge drive system according to an embodiment of the present application, the housing serves as the first multi-toothed member 1, the ring gear of the planetary gear set serves as the second multi-toothed member 2, and the first multi-toothed member 1 and the second multi-toothed member 2 are assembled together through spline fitting so that they cannot rotate relative to each other. In this way, when the motor inputs torque through the sun gear of the planetary gear set, the torque can be output toward the outside through the planetary gear carrier of the planetary gear set.

[0043] In this embodiment, the first multi-tooth member 1 can be made of metal materials such as aluminum or aluminum alloy. Figure 1A , Figure 1B and Figure 1D As shown, the first multi-toothed member 1 includes a first body 11 and a plurality of first key teeth 12 formed as one body, and the plurality of first key teeth 12 are evenly distributed at intervals in the circumferential direction. Each first key tooth 12 protrudes from the first body 11 toward the radial inner side and extends a predetermined dimension in a straight line along the axial direction, thereby the plurality of first key teeth 12 constitute an internal spline.

[0044] In addition, if Figure 1C and Figure 1D As shown, the first multi-toothed member 1 is further formed with an annular groove 1 c for mounting the main body 31 of the snap ring 3 . The annular groove 1 c extends along the circumferential direction and has the same circumferential dimension as the main body 31 of the snap ring 3 .

[0045] In this embodiment, the second multi-tooth member 2 can be made of metal materials such as steel. Figures 1A to 1D As shown, the second multi-toothed member 2 includes a second body 21 and a plurality of second key teeth 22 formed as one body, and the plurality of second key teeth 22 are evenly distributed in the circumferential direction at intervals. Each second key tooth 22 protrudes from the second body 21 toward the radial outside and extends a predetermined dimension in a straight line along the axial direction, thereby the plurality of second key teeth 22 constitute an external spline, and the external spline and the internal spline are spline-matched. In addition, the second multi-toothed member 2 also includes a plurality of teeth protruding from the second body 21 toward the radial inside, and these teeth are used to mesh with the planetary gears of the planetary gear.

[0046] In this embodiment, the snap ring 3 can be made of metal materials such as spring steel. Figures 1A to 1DAs shown, the snap ring 3 includes a main body 31 formed in an annular shape. Specifically, the main body 31 extends along the circumferential direction and has a first circumferential end 31e1 and a second circumferential end 31e2. The first circumferential end 31e1 is formed with a snap-fit ​​protrusion 31s1, and the second circumferential end 31e2 is formed with a snap-fit ​​groove 31s2. The outer wall of the snap-fit ​​protrusion 31s1 has a plurality of first snap-fit ​​teeth 31t1, and the first snap-fit ​​teeth 31t1 are located on the outer circumferential surface and the inner circumferential surface of the snap-fit ​​protrusion 31s1. These first snap-fit ​​teeth 31t1 are arranged side by side on the outer wall of the snap-fit ​​protrusion 31s1, and each first snap-fit ​​tooth 31t1 extends a predetermined size along the axial direction. Correspondingly, the inner wall of the snap-fit ​​groove 31s2 is formed with a plurality of second snap-fit ​​teeth 31t2. The number, arrangement position and shape of the plurality of second snap-fit ​​teeth 31t2 correspond to the number, arrangement position and shape of the plurality of first snap-fit ​​teeth 31t1, respectively. Thus, when the engaging protrusion 31s1 is inserted into the engaging groove 31s2, the first engaging tooth 31t1 and the second engaging tooth 31t2 mesh with each other, and the first circumferential end 31e1 and the second circumferential end 31e2 are in a state of engaging with each other. In addition, since the circumferential side surfaces of each first engaging tooth 31t1 (i.e., the circumferential one side surface and the circumferential other side surface of each first engaging tooth 31t1) extend from the tooth root toward the tooth top toward the side where the second circumferential end 31e2 is located ( Figure 2D The second engaging tooth 31t2 has a shape corresponding to the first engaging tooth 31t1, so that the first circumferential end portion 31e1 and the second circumferential end portion 31e2 can only move relative to each other in a direction away from each other. In this way, after being assembled in place, the snap ring 3 will not be deformed by shrinking in diameter, and thus will not fall out of the annular groove 1c, thereby effectively preventing the snap ring 3 from unexpectedly falling out of the annular groove 1c due to the influence of system operation after being installed in place with a relatively simple structure.

[0047] Furthermore, if Figure 1C and Figure 2B As shown, the axial thickness of the first circumferential end portion 31e1 and the second circumferential end portion 31e2 is greater than the axial thickness of the other portions of the main body portion 31 except the first circumferential end portion 31e1 and the second circumferential end portion 31e2, and the radial height of the first circumferential end portion 31e1 and the second circumferential end portion 31e2 is greater than the radial height of the other portions of the main body portion 31 except the first circumferential end portion 31e1 and the second circumferential end portion 31e2. In this way, the structural strength of the first circumferential end portion 31e1 and the second circumferential end portion 31e2 can be enhanced. In addition, as Figure 1CAs shown, in this embodiment, the axial thickness is increased by making the first circumferential end 31e1 and the second circumferential end 31e2 protrude in a direction away from the first key tooth 12 and the second key tooth 22 relative to other parts, so that the surface of the snap ring 3 facing the first key tooth 12 and the second key tooth 22 is flat, which will not affect the axial positioning of the snap ring 3 on the first multi-toothed member 1 and the second multi-toothed member 2. The radial height is increased by making the axial thickness of the first circumferential end 31e1 and the second circumferential end 31e2 protrude inward in the radial direction relative to other parts, so that the surface of the snap ring 3 facing the groove bottom of the annular groove 1c is flat, which will not affect the radial shape matching between the snap ring 3 and the annular groove 1c.

[0048] The following describes an assembly method of the first multi-tooth member 1 , the second multi-tooth member 2 , and the snap ring 3 of the electric bridge drive system according to an embodiment of the present application.

[0049] The assembly method may include a first assembly step and a second assembly step that are performed sequentially. In the first assembly step, the first multi-toothed member 1 and the second multi-toothed member 2 are first assembled together so that the first key teeth 12 and the second key teeth 22 are spline-matched with each other. Further, in the second assembly step, as Figure 2A and Figure 2B As shown, a special tool can be used to put the snap ring 3 in a pre-assembled state in which the first circumferential end 31e1 and the second circumferential end 31e2 are engaged with each other. Specifically, the engaging protrusion 31s1 can be inserted into the engaging groove 31s2 along the axial direction so that the two can be engaged with each other. In the pre-assembled state, the engaging protrusion 31s1 is inserted into the engaging groove 31s2 to the greatest extent, so that the diameter of the snap ring 3 is the smallest at this time. Further, the snap ring 3 in the pre-assembled state is placed at the position of the annular groove 1c so that they are aligned in the axial direction, and then the first circumferential end 31e1 and the second circumferential end 31e2 are moved relative to each other in a direction away from each other so that the diameter of the snap ring 3 becomes larger. Finally, the snap ring 3 is assembled into the annular groove 1c while the snap ring 3 maintains the first circumferential end 31e1 and the second circumferential end 31e2 in an assembled state in which the snap ring 3 is engaged with each other. The assembly state is as shown in FIG. Figure 2C and Figure 2D As shown. Thus, not only can the clamping ring 3 be assembled into the annular clamping groove 1c in a relatively simple manner, but also the corresponding assembly cost can be reduced while preventing the clamping ring 3 from unexpectedly escaping from the annular clamping groove 1c.

[0050] The present application is not limited to the embodiments listed in the above specific implementation manner, and the technical solution of the present application is supplemented as follows.

[0051] i. It can be understood that the spline mechanism of the present application may include a first multi-tooth member 1, a second multi-tooth member 2 and a retaining ring 3 that are spline-matched with each other. The spline mechanism is not limited to application in electric bridge drive systems, but can also be applied to other vehicle power systems, and even to more other application scenarios.

[0052] ii. In the above specific embodiment, it is described that the first engaging tooth 31t1 is formed on both the outer circumference and the inner circumference of the engaging protrusion 31s1, but the present application is not limited thereto. In an optional solution, the first engaging tooth 31t1 can be formed on the outer circumference or the inner circumference of the engaging protrusion 31s1, and the arrangement position of the second engaging tooth 31t2 in the engaging groove 31s2 can be adjusted accordingly. In this optional solution, the inner circumference or the outer circumference of the engaging protrusion 31s1 without the first engaging tooth 31t1 can be a plane, and similarly, the inner circumference or the outer circumference of the engaging groove 31s2 without the second engaging tooth 31t2 can also be a plane.

[0053] iii. It can be understood that, in addition to the solution described in the above embodiments of providing the first engaging teeth 31t1 and the second engaging teeth 31t2 to prevent the retaining ring 3 from shrinking and deforming, other structures can also be used in the present application to achieve the same effect.

[0054] iv. It can be understood that the technical solution of the present application is particularly suitable for clamping rings with larger diameters (eg, 231 mm), and can improve the rigidity of the entire clamping ring.

[0055] v. In the above specific embodiment, it is described that when the first circumferential end 31e1 and the second circumferential end 31e2 are in a state of being engaged with each other, the engaging teeth 31t1 and 31t2 are used to realize that the first circumferential end 31e1 and the second circumferential end 31e2 can only move relative to each other in a direction away from each other, so that the snap ring 3 can be applied to an annular snap groove 1c with an opening opening toward the radial inside. However, the present application is not limited to this. In an optional scheme, engaging teeth with different shapes from the engaging teeth 31t1 and 31t2 described in the above specific embodiment can be provided to realize that the first circumferential end and the second circumferential end can only move relative to each other in a direction approaching each other, so that the snap ring can be applied to a snap groove with an opening opening toward the radial outside.

Claims

1. A snap ring, characterized in that: The invention comprises an annular main body (31), wherein the main body (31) has a first circumferential end (31e1) and a second circumferential end (31e2), wherein the first circumferential end (31e1) and the second circumferential end (31e2) can be engaged with each other. When the first circumferential end portion (31e1) and the second circumferential end portion (31e2) are in a state of being engaged with each other, the first circumferential end portion (31e1) and the second circumferential end portion (31e2) can only move relative to each other in a direction away from each other, or the first circumferential end portion (31e1) and the second circumferential end portion (31e2) can only move relative to each other in a direction approaching each other.

2. The snap ring according to claim 1, characterized in that: The first circumferential end portion (31e1) is formed with a locking protrusion (31s1), the second circumferential end portion (31e2) is formed with a locking groove (31s2), the outer wall of the locking protrusion (31s1) has a plurality of first locking teeth (31t1), and the inner wall of the locking groove (31s2) is formed with a plurality of second locking teeth (31t2), When the locking protrusion (31s1) is inserted into the locking groove (31s2), the first locking tooth (31t1) and the second locking tooth (31t2) engage with each other, thereby allowing the first circumferential end (31e1) and the second circumferential end (31e2) to move relative to each other only in a direction away from each other or allowing the first circumferential end (31e1) and the second circumferential end (31e2) to move relative to each other only in a direction toward each other.

3. The snap ring according to claim 2, characterized in that: The first engaging tooth (31t1) is formed on at least one of the outer peripheral surface and the inner peripheral surface of the engaging protrusion (31s1), and the second engaging tooth (31t2) is formed at a position of the engaging groove (31s2) corresponding to the first engaging tooth (31t1).

4. The snap ring according to claim 2 or 3, characterized in that: The two circumferential side surfaces of each of the first engaging teeth (31t1) extend obliquely toward the side where the second circumferential end portion (31e2) is located in the process of extending from the tooth root toward the tooth top.

5. The clamping ring according to any one of claims 1 to 3, characterized in that The axial thickness of the first circumferential end portion (31e1) and / or the second circumferential end portion (31e2) is greater than the axial thickness of other portions of the main body portion (31), and / or, The radial height of the first circumferential end portion (31e1) and / or the second circumferential end portion (31e2) is greater than the radial height of other portions of the main body portion (31).

6. A spline mechanism, characterized in that: include: A first multi-toothed member (1) having a plurality of first key teeth (12) and formed with an annular groove (1c); A second multi-toothed member (2) having a plurality of second key teeth (22), wherein the plurality of second key teeth (22) mesh with the plurality of first key teeth (12); as well as The retaining ring (3) described in any one of claims 1 to 5, wherein the main body (31) of the retaining ring (3) is installed in the annular retaining groove (1c), and is used to limit the axial relative movement of the first multi-toothed member (1) and the second multi-toothed member (2), and the first circumferential end portion (31e1) and the second circumferential end portion (31e2) are in an assembled state of being clamped to each other.

7. The spline mechanism according to claim 6, characterized in that: The plurality of first key teeth (12) constitute an internal spline, the plurality of second key teeth (22) constitute an external spline, and the external spline cooperates with the internal spline.

8. A bridge drive system, characterized in that: Includes the spline mechanism described in claim 6 or 7.

9. The electric bridge drive system according to claim 8, characterized in that: It also comprises a housing and a planetary gear, wherein the housing serves as the first multi-tooth component (1), and the planetary gear comprises a sun gear, planetary gears and a ring gear serving as the second multi-tooth component (2).

10. An assembly method of a spline mechanism according to claim 6 or 7, characterized in that: include: A first assembly step, wherein the first multi-toothed member (1) and the second multi-toothed member (2) are assembled together so that the first key teeth (12) and the second key teeth (22) are spline-fitted to each other; as well as The second assembly step, wherein the snap ring (3) is placed at the position where the annular groove (1c) is located when the snap ring (3) is in a pre-assembled state in which the first circumferential end (31e1) and the second circumferential end (31e2) are engaged with each other, so that the first circumferential end (31e1) and the second circumferential end (31e2) move relative to each other in a direction away from each other, thereby assembling the snap ring (3) into the annular groove (1c) while the snap ring (3) maintains the first circumferential end (31e1) and the second circumferential end (31e2) in a state in which the snap ring (3) is engaged with each other.

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