Spline mechanism, mounting method thereof and bridge driving system

Abstract

The invention provides a spline mechanism, a mounting method thereof and a bridge driving system. The spline mechanism includes a first multi-tooth member and a second multi-tooth member that are assembled together to achieve a spline fit. An annular clamping groove is formed in the first multi-tooth piece, and a mounting groove is formed in the second multi-tooth piece. A clamping ring of the spline mechanism is installed in the annular clamping groove so as to limit the axial relative movement of the first multi-tooth piece and the second multi-tooth piece. In addition, an opening is formed in the clamping ring, a main body part of a limiting block of the spline mechanism is installed in the installation groove, and an insertion protrusion, protruding relative to the main body part, of the limiting block is inserted into the opening of the clamping ring. Therefore, the clamping ring can be limited at least in the radial direction and the circumferential direction of the clamping ring by utilizing the matching of the main body part and the insertion bulge of the limiting block and the clamping ring, so that the risk that the clamping ring is unexpectedly separated from the annular clamping groove can be effectively reduced or eliminated through a relatively simple structure.

Description

Technical Field

[0001] The present application relates to a limiting structure for a transmission mechanism in a vehicle power system, and more particularly to a spline mechanism and an installation method thereof, including a bridge drive system with a spline mechanism. Background Art

[0002] A bridge drive system is an existing vehicle power system. The bridge drive system may include an electric motor as a power source and a transmission for transmitting the torque of the electric motor to the outside. The rotating shaft of the rotor of the electric motor extends to the position where the transmission is located, and the input gear of the transmission is mounted on the rotating shaft and is in transmission connection with the rotating shaft through spline fit.

[0003] Furthermore, in order to limit the relative movement in the axial direction between the input gear and the rotating shaft, a snap ring is installed in the annular groove of the rotating shaft to limit the relative axial movement between the two. The snap ring has an annular shape and extends circumferentially, and is formed in a C-shaped shape with an opening. After being installed in place, when the bridge drive system is in operation, the snap ring may be affected by centrifugal force or vibration, and there is a risk of coming out of the annular groove. Therefore, in order to reduce or even eliminate such a risk, technicians have designed a locking nut installed on the rotating shaft. However, in order to install the locking nut on the rotating shaft, corresponding threads usually need to be machined on the rotating shaft, which increases the processing complexity and the corresponding cost; moreover, after oil enters between the locking nut and the rotating shaft, the locking nut is likely to become loose, and if an adhesive is used to prevent loosening, the cost will be further increased and pollution may be caused. Summary of the Invention

[0004] In view of the above-mentioned defects of the prior art, the present application is made. An object of the present application is to provide a spline mechanism that can effectively reduce or eliminate the risk of the snap ring unexpectedly coming out of the annular groove with a relatively simple structure. Another object of the present application is to provide a bridge drive system including the above-mentioned spline mechanism.

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

[0006] The present application provides a spline mechanism as follows, including:

[0007] A first multi-tooth member having a plurality of first key teeth and formed with an annular groove;

[0008] A second multi-tooth member having a plurality of second key teeth and formed with a first installation groove, the plurality of second key teeth being in tooth engagement with the plurality of first key teeth;

[0009] A snap ring installed in the annular groove to limit the relative axial movement between the first multi-tooth member and the second multi-tooth member, the snap ring extending circumferentially and formed with an opening; and

[0010] The first limiting block includes a first main body portion and a first insertion protrusion protruding relative to the first main body portion. The first main body portion is installed in the first installation groove and is located radially outside the snap ring. The first insertion protrusion is inserted into the opening, and the snap ring is limited at least in the radial and circumferential directions by the first limiting block.

[0011] In an alternative embodiment, the first limiting block further includes a first side protrusion protruding relative to the first main body portion and located on one axial side of the snap ring, so as to prevent the first limiting block from disengaging from the first installation groove.

[0012] In another alternative embodiment, one side wall of the snap ring abuts against the side wall of the annular card slot, and the other side wall of the snap ring abuts against the first side protrusion.

[0013] In another alternative embodiment, the second multi-tooth member is sleeved outside the first multi-tooth member.

[0014] The second multi-tooth member further forms a second installation groove, the snap ring further forms a notch opening radially outward, and

[0015] The spline mechanism further includes a second limiting block. The second limiting block includes a second main body portion and a second insertion protrusion protruding relative to the second main body portion. The second insertion protrusion is inserted into the notch, and the snap ring is limited at least in the radial and circumferential directions by the second limiting block.

[0016] In another alternative embodiment, the circumferential center line of the notch is spaced 180 degrees of central angle from the circumferential center line of the opening.

[0017] In another alternative embodiment, the second limiting block further includes a second side protrusion protruding relative to the second main body portion and located on one axial side of the snap ring, so as to prevent the second limiting block from disengaging from the second installation groove.

[0018] In another alternative embodiment, the inner circumferential surface of the first limiting block is formed as an inclined surface, so that one axial end of the first limiting block is formed as a tapered shape; and

[0019] The inner circumferential surface of the second limiting block is formed as an inclined surface, so that one axial end of the first limiting block is formed as a tapered shape.

[0020] In another alternative solution, the snap ring is installed in the annular card slot in a clearance fit manner, the first main body portion is installed in the first installation slot in a clearance fit manner, the second main body portion is installed in the second installation slot in a clearance fit manner, the first insertion protrusion is inserted into the opening in a clearance fit manner, and the second insertion protrusion is inserted into the notch in a clearance fit manner.

[0021] The present application also provides an installation method for the spline mechanism according to any one of the above technical solutions, which is characterized by including the following steps:

[0022] A snap ring installation step, in which, in a state where the snap ring is elastically expanded and deformed, the snap ring is installed into the annular card slot of the first multi-tooth member; and

[0023] A limit block installation step, in which, in a state where the snap ring is elastically contracted and deformed, the first limit block is installed into the first installation slot and the second limit block is installed in the second installation slot, and then the snap ring is restored to a state without elastic deformation, so that the first insertion protrusion of the first limit block is inserted into the opening of the snap ring and the second insertion protrusion of the second limit block is inserted into the notch of the snap ring.

[0024] The present application also provides a bridge drive system as follows, including the spline mechanism according to any one of the above technical solutions.

[0025] By adopting the above technical solutions, the present application provides a novel spline mechanism, which includes a first multi-tooth member and a second multi-tooth member assembled together to achieve spline fit. The first multi-tooth member is formed with an annular card slot, and the second multi-tooth member is formed with an installation slot. The snap ring of the spline mechanism is installed in the annular card slot to limit the axial relative movement between the first multi-tooth member and the second multi-tooth member. In addition, the snap ring is formed with an opening, the main body portion of the limit block of the spline mechanism is installed in the installation slot, and the insertion protrusion protruding from the main body portion of the limit block is inserted into the opening of the snap ring. In this way, by using the main body portion and the insertion protrusion of the limit block to cooperate with the snap ring, the snap ring can be limited at least in the radial and circumferential directions of the snap ring, thereby effectively reducing or eliminating the risk of the snap ring unexpectedly coming out of the annular card slot with a relatively simple structure.

[0026] The present application also provides a vehicle power system including the above spline mechanism. By using the above spline mechanism, stable transmission connections between different components such as a rotating shaft and a gear can be achieved, for example, and it also has the same beneficial effects as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1A is a perspective schematic view showing a partial structure of a bridge drive system according to an embodiment of the present application.

[0028] Figure 1B is an enlarged schematic view showing a part of the structure of the bridge drive system in Figure 1A

[0029] Figure 1C is an enlarged schematic view showing another part of the structure of the bridge drive system in Figure 1A

[0030] Figure 2 is a three - dimensional schematic view showing the second multi - tooth part of the spline mechanism of the bridge drive system in Figure 1A

[0031] Figure 3 is a three - dimensional schematic view showing the structure of the snap ring of the spline mechanism of the bridge drive system in Figure 1A

[0032] Figure 4 is a three - dimensional schematic view showing the first limit block of the spline mechanism of the bridge drive system in Figure 1A

[0033] Description of Reference Numerals

[0034] 1 First multi - tooth part; 11 First body; 12 First key teeth; 1c Annular slot

[0035] 2 Second multi - tooth part; 21 Second body; 22 Second key teeth; 2c1 First mounting groove; 2c2 Second mounting groove

[0036] 3 Snap ring; 3c Opening; 3n Notch

[0037] 4a First limit block; 4b Second limit block; 41 Main body part; 41s Radial limit surface; 42 Insertion protrusion; 42s Circumferential limit surface; 43 Side protrusion; 43s Axial limit surface Detailed Description of the Invention

[0038] The exemplary embodiments of the present application will be 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 used to exhaust all possible ways of the present application, nor to limit the scope of the present application.

[0039] In the present application, unless otherwise specified, "axial", "radial" and "circumferential" respectively refer to the axial, radial and circumferential directions of the snap ring.

[0040] In the present application, "transmission connection" means that two components are connected in a manner capable of transmitting torque, including direct connection or indirect connection of these two components.

[0041] ​​​​​The following will describe a bridge drive system according to an embodiment of the present application and a spline mechanism included therein with reference to the accompanying drawings of the specification.

[0042] A bridge drive system according to an embodiment of the present application may include a motor and a transmission. The motor and the transmission are drivingly connected so that the torque of the motor can be transmitted to the outside through the transmission. The transmission may be installed in the housing of the bridge drive system and may include an input gear, and the input gear may be drivingly connected to the rotating shaft of the motor, whereby the transmission can receive the torque from the motor.

[0043] Furthermore, in a bridge drive system according to an embodiment of the present application, as Figures 1A to 1C shown, the rotating shaft of the motor (drivingly connected to the rotor laminate) serves as the first multi-tooth member 1, and the input gear of the transmission serves as the second multi-tooth member 2. The first multi-tooth member 1 and the second multi-tooth member 2 are assembled together by spline fitting so that they cannot rotate relative to each other. In this way, the motor transmits torque to the transmission via the rotating shaft.

[0044] In this embodiment, the first multi-tooth member 1 may be made of a metal material. As Figures 1A to 1C shown, the first multi-tooth member 1 includes a first body 11 formed integrally and a plurality of first key teeth 12. 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 radially outer side and extends linearly along the axial direction by a predetermined dimension. Thus, the plurality of first key teeth 12 constitute an external spline. In addition, as Figure 1B and Figure 1C shown, the first multi-tooth member 1 further forms an annular groove 1c for installing the snap ring 3. The annular groove 1c extends along the circumferential direction and has a radial dimension substantially the same as that of the snap ring 3.

[0045] In this embodiment, the second multi-tooth member 2 may be made of a metal material. As Figures 1A to 1C and Figure 2 shown, the second multi-tooth member 2 includes a second body 21 formed integrally and a plurality of second key teeth 22. The plurality of second key teeth 22 are evenly distributed at intervals in the circumferential direction. Each second key tooth 22 protrudes from the second body 21 toward the radially inner side and extends linearly along the axial direction by a predetermined dimension. Thus, the plurality of second key teeth 22 constitute an internal spline, and the internal spline is in spline fit with the external spline of the first multi-tooth member 1. In addition, the second multi-tooth member 2 further includes a plurality of teeth protruding from the second body 21 toward the radially outer side, and these teeth are used for tooth engagement with other gears.

[0046] Further, the second multi-tooth member 2 is also formed with a first mounting groove 2c1 and a second mounting groove 2c2 that respectively cooperate with the two limiting blocks (the first limiting block 4a and the second limiting block 4b). The first mounting groove 2c1 is formed at a position on the second multi-tooth member 2 that is radially outside the annular card slot 1c, and the first mounting groove 2c1 matches the main body portion 41 of the first limiting block 4a, so that the main body portion 41 of the first limiting block 4a is mounted in the first mounting groove 2c1. The second mounting groove 2c2 is formed at a position on the second multi-tooth member 2 that is radially outside the annular card slot 1c, and the second mounting groove 2c2 matches the main body portion 41 of the second limiting block 4b, so that the main body portion 41 of the second limiting block 4b is mounted in the second mounting groove 2c2. In order to enable the insertion protrusion 42 to be inserted into the opening 3c and the notch 3n of the snap ring 3 after the first limiting block 4a and the second limiting block 4b are mounted in place, the circumferential center lines between the first mounting groove 2c1 and the second mounting groove 2c2 may be spaced apart by a central angle of 180 degrees. In this article, a part of the circumferential center line refers to the midline of the circumferential dimension of this part, and this midline extends along the axial direction.

[0047] In this embodiment, as Figures 1A to 1C and Figure 3 shown, the snap ring 3 of the spline mechanism can be made of a metal material such as spring steel. The snap ring 3 extends circumferentially and is formed in a C-shaped configuration. The snap ring 3 has an opening 3c, and the snap ring 3 has two circumferential ends that are opposite to each other in the circumferential direction at the opening 3c. In addition, a notch 3n is formed at a position opposite to the opening 3c of the snap ring 3. The notch 3n only depresses toward the radial inside but does not disconnect the snap ring 3 in the circumferential direction. The circumferential center lines of both the opening 3c and the notch 3n of the snap ring 3 are spaced apart by a central angle of 180 degrees. The above-mentioned opening 3c and notch 3n are for the insertion protrusion 42 of the first limiting block 4a and the insertion protrusion 42 of the second limiting block 4b to be inserted. After being mounted in place, the snap ring 3 can be mounted in the annular card slot 1c of the first multi-tooth member 1 in a clearance fit manner. After the snap ring 3 returns to its initial state without elastic deformation, the snap ring 3 protrudes radially outward from the annular card slot 1c and radially overlaps with the radially inner part of the second multi-tooth member 2 (when observed axially, they block each other), whereby the snap ring 3 can limit the axial relative movement between the first multi-tooth member 1 and the second multi-tooth member 2.

[0048] In this embodiment, as Figures 1A to 1C shown, the spline mechanism includes two first limiting blocks 4a and second limiting blocks 4b with the same shape. They can both be made of a polymer material with a lighter weight or an aluminum alloy material. Here, the structure of the first limiting block 4a will be used as an example to illustrate them. As Figures 1A to 1C and Figure 4As shown, the first limiting block 4a includes a main body portion 41, an insertion protrusion 42, and a side protrusion 43 formed integrally. The main body portion 41 of the first limiting block 4a can be installed in the first installation groove 2c1 in a clearance fit manner. Both the insertion protrusion 42 and the side protrusion 43 protrude radially inward from the surface (radial inner wall) of the main body portion 41 facing the snap ring 3. The insertion protrusion 42 is provided at the circumferential central portion of the main body portion 41, and the side protrusion 43 is provided at an axial side portion of the main body portion 41, thereby forming a T-shaped structure through the insertion protrusion 42 and the side protrusion 43. In this way, the portion of the main body portion 41 facing the snap ring 3 where the insertion protrusion 42 and the side protrusion 43 are not provided is formed as a radial limiting surface 41s, the circumferential two side surfaces of the insertion protrusion 42 are formed as circumferential limiting surfaces 42s, and the side surface of the side protrusion 43 facing the snap ring 3 is formed as an axial limiting surface 43s.

[0049] By adopting the above solution, after the first limiting block 4a, the second limiting block 4b and the snap ring 3 are all installed in place, the main body parts 41 of the first limiting block 4a and the second limiting block 4b are both located on the radially outer side of the snap ring 3; the insertion protrusion 42 of the first limiting block 4a is inserted into the opening 3c of the snap ring 3, and the insertion protrusion 42 of the second limiting block 4b is inserted into the notch 3n of the snap ring 3; the side protrusions 43 of the first limiting block 4a and the second limiting block 4b are both located on one axial side of the snap ring 3. Thus, on the one hand, the radial limiting surface 41s of the first limiting block 4a cooperates with the outer peripheral surface of the snap ring 3 to limit the snap ring 3 in the radial direction; the circumferential limiting surface 42s of the first limiting block 4a cooperates with the circumferential end of the snap ring 3 to limit the snap ring 3 in the circumferential direction; the axial limiting surface 43s of the first limiting block 4a can abut against the side wall of the snap ring 3, so as to prevent the first limiting block 4a from disengaging from the first installation groove 2c1 and limit the snap ring 3 in the axial direction at the same time. On the other hand, the radial limiting surface 41s of the second limiting block 4b cooperates with the outer peripheral surface of the snap ring 3 to limit the snap ring 3 in the radial direction; the circumferential limiting surface 42s of the second limiting block 4b cooperates with the circumferential side wall of the notch 3n of the snap ring 3 to limit the snap ring 3 in the circumferential direction; the axial limiting surface 43s of the second limiting block 4b can abut against the side wall of the snap ring 3, so as to prevent the second limiting block 4b from disengaging from the second installation groove 2c2 and limit the snap ring 3 in the axial direction at the same time. Further, in addition to using the first limiting block 4a and the second limiting block 4b to limit the snap ring 3, the annular card slot 1c limits the snap ring 3 in the radial and axial directions. In this way, the risk of the snap ring 3 undesirably disengaging from the annular card slot 1c can be effectively reduced or eliminated with a relatively simple structure. In addition, even if both the first multi-tooth member 1 and the second multi-tooth member 2 rotate at a relatively high speed, the two limiting blocks 4a, 4b can prevent the opening 3c of the snap ring 3 from becoming larger, so that the snap ring 3 will not disengage. Moreover, the two limiting blocks 4a, 4b are positioned in the two installation grooves 2c1, 2c2, so that there is no relative rotation between the snap ring 3 and the first multi-tooth member 1 and the second multi-tooth member 2, thereby reducing the fretting wear of each component, increasing their service life and reducing the pollution caused by the debris of the wear.

[0050] In addition, as Figure 4As shown, the inner circumferential surfaces of the first limiting block 4a and the second limiting block 4b are formed as inclined surfaces, such that the dimensions of the axially one - side end portions of the first limiting block 4a and the second limiting block 4b are tapered towards the axially one - side, whereby the axially one - side end portions of the first limiting block 4a and the second limiting block 4b are both formed as wedge - shaped. Even if the snap ring 3 is slightly misaligned in the radial direction during installation, the wedge - shaped axially one - side end portions of the limiting blocks 4a, 4b can automatically correct such misalignment, enabling the limiting blocks 4a, 4b to be smoothly inserted into the corresponding installation grooves 2c1, 2c2 respectively. The insertion protrusions 42 of the first limiting block 4a and the second limiting block 4b are configured as wedge - shaped with the circumferential dimension gradually decreasing towards the radially inner side. In this way, even if the opening 3c of the snap ring 3 is slightly misaligned with the insertion protrusion 42 of the first limiting block 4a, or the notch 3n of the snap ring 3 is slightly misaligned with the insertion protrusion 42 of the second limiting block 4b during installation, the wedge - shaped insertion protrusion 42 can automatically correct such misalignment, enabling the insertion protrusions 42 of the first limiting block 4a and the second limiting block 4b to be smoothly inserted into the opening 3c or the notch 3n of the snap ring 3 respectively.

[0051] The installation method of the spline mechanism according to the present application will be described below.

[0052] Refer to Figures 1A to 1C , the installation method of the spline mechanism according to the present application includes a snap - ring installation step and a limiting - block installation step executed in the following order. Specifically, after the second multi - toothed member 2 (such as an input gear) is sleeved on the first multi - toothed member 1 (such as a rotating shaft), the snap - ring installation step is executed. In the snap - ring installation step, a special tool is used to cause the snap ring 3 to undergo elastic deformation of diameter expansion so that the snap ring 3 is in an elastically expanded deformation state, and the snap ring 3 is axially moved to the annular groove 1c of the first multi - toothed member 1, and then the snap ring 3 is installed into the annular groove 1c of the first multi - toothed member 1. Further, in the limiting - block installation step, the snap ring 3 is further caused to undergo elastic deformation of diameter contraction so that the snap ring 3 is in an elastically contracted deformation state. With the side protrusion 43 of the first limiting block 4a as the front side (the front side / entry side when entering the first installation groove 2c1), the side protrusion 43 is made to cross the two circumferential end portions of the snap ring 3, and the first limiting block 4a is installed into the first installation groove 2c1. Similarly, the second limiting block 4b is installed into the second installation groove 2c2. Then, the snap ring 3 is restored to its initial state without elastic deformation, and the insertion protrusion 42 of the first limiting block 4a is inserted into the opening 3c of the snap ring 3, the insertion protrusion 42 of the second limiting block 4b is inserted into the notch 3n of the snap ring 3, and the side protrusions 43 of the two limiting blocks 4a, 4b are both located on the axially one - side (axially inner side, that is, the side closer to the center of the second multi - toothed member 2 in the axial direction).

[0053] It can be understood that the disassembly of the spline mechanism can be achieved by adopting steps opposite to the above installation method, and the snap ring 3 can prevent the limiting block from disengaging from the installation groove before the snap ring 3 undergoes elastic deformation of diameter reduction. Therefore, the structural stability of the entire spline mechanism is relatively good.

[0054] This application is not limited to the embodiments listed in the above specific embodiments. The following is a supplementary description of the technical solutions of this application.

[0055] i. It can be understood that the spline mechanism of this application may include a first multi-tooth member 1, a second multi-tooth member 2, and a snap ring 3 that are in spline fit with each other. This spline mechanism is not limited to being applied to the electric bridge drive system, but can also be applied to other vehicle power systems, and even more other application scenarios. For example, this spline mechanism can be used for the installation between the ring gear of the planetary gear set of the transmission and the transmission housing.

[0056] ii. In the above embodiments, the circumferential midlines of the opening 3c and the notch 3n of the snap ring 3 are spaced apart by a central angle of 180 degrees, but this application is not limited thereto. In an alternative solution, the circumferential midlines of the opening 3c and the notch 3n of the snap ring 3 can be spaced apart by other angles such as a central angle of 90 degrees or 120 degrees.

[0057] In addition, multiple notches 3n can be provided and multiple second limiting blocks 4b can be correspondingly provided. In addition, the notch 3n of the snap ring 3 can be omitted, and only by using the opening 3c of the snap ring 3 to cooperate with the first limiting block 4a, an effect substantially the same as that described in the above embodiments can be achieved.

[0058] iii. In the above embodiments, the first limiting block 4a and the second limiting block 4b have the same structure, but this application is not limited thereto. In an alternative solution, the first limiting block 4a and the second limiting block 4b can have different structures.

[0059] iv. In the above embodiments, the snap ring 3 is installed in the annular card slot 1c in a clearance fit manner, the main body portion 41 of the limiting block is installed in the installation groove in a clearance fit manner, and the insertion protrusion 42 of the limiting blocks 4a and 4b is inserted into the opening 3c or the notch 3n of the snap ring 3 in a clearance fit manner. Therefore, the processing precision requirements for related components are relatively low, resulting in cost reduction. However, these are all exemplary and not restrictive.

Claims

1. A spline mechanism, characterized in that, Comprising: A first multi-tooth member (1) having a plurality of first key teeth (12) and formed with an annular card slot (1c); A second multi-tooth member (2) having a plurality of second key teeth (22) and formed with a first mounting groove (2c1), the plurality of second key teeth (22) being in tooth engagement with the plurality of first key teeth (12); A snap ring (3) mounted in the annular card slot (1c) to limit the axial relative movement between the first multi-tooth member (1) and the second multi-tooth member (2), the snap ring (3) extending circumferentially and formed with an opening (3c); and A first limiting block (4a) including a first main body portion (41) and a first insertion protrusion (42) protruding relative to the first main body portion (41), the first main body portion (41) being mounted in the first mounting groove (2c1) and located radially outside the snap ring (3), the first insertion protrusion (42) being inserted into the opening (3c), and the first limiting block (4a) being used to limit the snap ring (3) at least in the radial and circumferential directions of the snap ring (3).

2. The spline mechanism according to claim 1, characterized in that, The first limiting block (4a) further includes a first side protrusion (43) protruding relative to the first main body portion (41) and located on one axial side of the snap ring (3), so as to prevent the first limiting block (4a) from disengaging from the first mounting groove (2c1).

3. The spline mechanism according to claim 2, characterized in that, One side wall of the snap ring (3) abuts against the side wall of the annular card slot (1c), and the other side wall of the snap ring (3) abuts against the first side protrusion (43).

4. The spline mechanism according to any one of claims 1 to 3, characterized in that The second multi-tooth member (2) is sleeved outside the first multi-tooth member (1), The second multi-tooth member (2) is further formed with a second mounting groove (2c2), the snap ring (3) is further formed with a notch (3n) opening radially outward, and The spline mechanism further includes a second limiting block (4b), the second limiting block (4b) including a second main body portion (41) and a second insertion protrusion (42) protruding relative to the second main body portion (41), the second insertion protrusion (42) being inserted into the notch (3n), and the second limiting block (4b) being used to limit the snap ring (3) at least in the radial and circumferential directions.

5. The spline mechanism according to claim 4, characterized in that, The circumferential center line of the notch (3n) is spaced from the circumferential center line of the opening (3c) by a central angle of 180 degrees.

6. The spline mechanism according to claim 4, wherein, The second limiting block (4b) further includes a second side protrusion (43) protruding relative to the second main body portion (41) and located on one axial side of the snap ring (3), so as to prevent the second limiting block (4b) from disengaging from the second mounting groove (2c2).

7. The spline mechanism according to claim 4, characterized in that The inner circumferential surface of the first limiting block (4a) is formed as an inclined surface, so that one axial end of the first limiting block (4a) is formed as a tapered shape; and The inner circumferential surface of the second limiting block (4b) is formed as an inclined surface such that one axial end of the first limiting block (4a) is formed in a tapered shape.

8. The spline mechanism according to claim 4, characterized in that The snap ring (3) is installed in the annular groove (1c) in a clearance fit manner, the first main body portion (41) is installed in the first installation groove (2c1) in a clearance fit manner, the second main body portion (41) is installed in the second installation groove (2c2) in a clearance fit manner, the first insertion protrusion (42) is inserted into the opening (3c) in a clearance fit manner, and the second insertion protrusion (42) is inserted into the notch (3n) in a clearance fit manner.

9. A method for installing a spline mechanism according to any one of claims 4 to 8, characterized in that, It includes the following steps: A snap ring installation step, in which the snap ring (3) is installed into the annular groove (3c) of the first multi-tooth member (1) in a state where the snap ring (3) is elastically expanded and deformed; and A limiting block installation step, in which the first limiting block (4a) is installed in the first installation groove (2c1) and the second limiting block (4b) is installed in the second installation groove (2c2) in a state where the snap ring (3) is elastically contracted and deformed, and then the snap ring (3) is restored to a state of no elastic deformation so that the first insertion protrusion (42) of the first limiting block (4a) is inserted into the opening (3c) of the snap ring (3) and the second insertion protrusion (42) of the second limiting block (4b) is inserted into the notch (3n) of the snap ring (3).

10. A bridge drive system, characterized in that, It includes the spline mechanism according to any one of claims 1 to 8.

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