Planetary gear reducer and vehicle

Abstract

The utility model relates to a planetary gear reducer with high safety and reliability, including reducer shell and with the periphery fixed connection of reducer shell outer gear ring, be equipped with the elastic stop piece for axial fixed outer gear ring between reducer shell and outer gear ring, be equipped with the installation slot for the installation elastic stop piece in reducer shell, and the elastic stop piece has the clamping structure, and the installation slot has the clamping cooperation structure, and the clamping structure and clamping cooperation structure shape cooperation make the elastic stop piece be installed slot axial fixed. This technical scheme avoids the axial stop mechanism of traditional washer and elastic stop ring cooperation, and the structure is stable, and it is not easy to fall off, improves the operation stability and safety of planetary gear reducer.

Description

Technical Field

[0001] This utility model relates to a planetary gear reducer, and more particularly to a planetary gear reducer with high reliability requirements. Background Technology

[0002] In planetary gear reducers, the external gear ring typically needs to be axially fixed to ensure stable operation. Figure 1 In the existing technical solution shown, the axial stop of the external gear ring is achieved by using a washer and an elastic retaining ring in combination, so as to meet the structural stability requirements of the planetary gear reducer during normal operation.

[0003] However, when the planetary gear reducer with this design is in a non-powered sliding state, due to specific stress conditions, the elastic retaining ring is prone to popping out of the installation position, causing the axial positioning of the external gear ring to fail, which may affect the normal operation of the planetary gear reducer and pose a safety hazard. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an improved planetary gear reducer that can effectively prevent the axial fixing device of the external gear ring from falling off and ensure the axial positioning of the external gear ring.

[0005] The aforementioned technical problem is solved by a planetary gear reducer designed according to this utility model. This planetary gear reducer has a reducer housing and an external gear ring circumferentially fixed to the reducer housing. An elastic stop for axially fixing the external gear ring is provided between the reducer housing and the external gear ring. An installation groove for housing the elastic stop is provided inside the reducer housing. In this utility model, the elastic stop has a snap-fit ​​structure, and the installation groove has a snap-fit ​​engagement structure. The snap-fit ​​structure and the snap-fit ​​engagement structure are shaped to fit together, so that the elastic stop is axially fixed by the installation groove. This technical solution avoids the traditional axial stop mechanism using washers and elastic retaining rings. In the sliding state, because the snap-fit ​​structure is stopped by the snap-fit ​​engagement mechanism, the entire elastic stop is axially fixed, thereby axially fixing the external gear ring. Moreover, the structure is stable and not easily detached, improving the operational stability and safety of the planetary gear reducer.

[0006] According to a preferred embodiment of this utility model, the elastic stop has a C-shaped or U-shaped structure, and the mounting groove has a T-shaped structure. Furthermore, the elastic stop has a first protruding edge on its axially outer side for axially fixing the external gear ring to the reducer housing, and a second protruding edge on its axially inner side for circumferentially and radially fixing itself within the mounting groove. A groove is provided between the first and second protruding edges, and a protruding beam that matches the shape of the groove is provided on the mounting groove. The groove abuts against the protruding beam, thus axially fixing the elastic stop to the reducer housing. This design structure is relatively simple, facilitates the production of the elastic stop, and makes machining of the mounting groove convenient. Simultaneously, this connection method is stable and reliable, not easily detached, and can effectively ensure the operational stability and safety of the planetary gear reducer.

[0007] Furthermore, the radial width of the second protruding edge is smaller than that of the first protruding edge. This design ensures that the first protruding edge of the elastic stop can be smoothly inserted into the gap between the mounting slot protruding beam and the external gear ring, facilitating the assembly of the planetary gear reducer. Preferably, the axial thickness of the second protruding edge is greater than that of the first protruding edge. This ensures that the second protruding edge has sufficient strength, is not prone to deformation and detachment, and thus axially stops the external gear ring on the reducer housing.

[0008] According to a preferred embodiment of this utility model, the circumferential width of the elastic stop is greater than the circumferential width of the mounting groove, and the axial width of the groove is less than the axial width of the protruding beam. This design makes the interference fit connection between the elastic stop and the mounting groove more robust and reliable.

[0009] According to a preferred embodiment of this utility model, the radially inner edges of the mounting groove and the protruding beam are designed with chamfers. Furthermore, the chamfers can be designed as rounded corners with a radius of 0.3mm to 0.5mm. The chamfer design facilitates installation, improves assembly efficiency, effectively prevents scratches on the elastic stop, and effectively prevents stress concentration, thereby increasing the service life of the elastic stop and ultimately improving the reliability and safety of the planetary gear reducer.

[0010] According to a preferred embodiment of this utility model, the number of elastic stoppers is at least three, and preferably six. When the number of elastic stoppers is less than three, the axial force applied by the elastic stoppers to the external gear ring is insufficient to axially fix the external gear ring in the reducer housing. When the number is greater than six, more mounting slots need to be machined, increasing production costs. When the number of elastic stoppers is six, the external gear ring can be effectively fixed, improving the reliability and safety of the planetary gear reducer, while also saving machining costs.

[0011] According to a preferred embodiment of the present invention, the elastic stop can be further fixed in the mounting groove by welding or bonding, making the connection between the elastic stop and the mounting groove more secure and reliable.

[0012] Based on the above-mentioned reducer design, the technical problem of this utility model can also be solved by a vehicle. After the vehicle is equipped with a planetary gear reducer with the above-mentioned features, the elastic stop of the axially fixed external gear ring is firmly positioned during the vehicle's coasting process, which improves the reliability and safety of the planetary gear reducer and reduces safety hazards. Attached Figure Description

[0013] The present invention will now be described in more detail with reference to the accompanying drawings, but this does not limit the overall concept of the invention.

[0014] Figure 1 This is a cross-sectional view of the assembly method of the external gear ring and the reducer housing in the prior art;

[0015] Figure 2 This is a cross-sectional view showing the assembly method of the external gear ring and the reducer housing of this utility model;

[0016] Figure 3 This is a schematic diagram of the installation of the elastic stop component of this utility model on the reducer housing;

[0017] Figure 4 This is an enlarged view of the elastic stop component of this utility model;

[0018] Figure 5 This is a schematic diagram of the mounting groove of the elastic stop component of this utility model on the reducer housing.

[0019] In this utility model, unless otherwise specified, "axial", "radial" and "circumferential" are all relative to the planetary gear reducer. Detailed Implementation

[0020] Figure 1 The assembly method of the external gear ring 2' and housing 1' in a planetary gear reducer in the prior art is shown. Figure 1 In the planetary gear reducer shown, the external gear ring 2' is axially fixed to the reducer housing by a washer 5 and an open elastic retaining ring 4. When the planetary gear reducer with this design is in a non-powered sliding state, due to specific stress conditions, the elastic retaining ring 4 is prone to popping out of its installation position, causing the axial positioning of the external gear ring to fail, which may affect the normal operation of the planetary gear reducer and pose a safety hazard.

[0021] Figure 2 and Figure 3 The assembly method of the planetary gear reducer designed according to this utility model is shown. For example... Figure 2 and Figure 3As shown, the planetary gear reducer designed according to this utility model has a reducer housing 1 and an external gear ring 2 that is circumferentially fixedly connected to the reducer housing 1. The planetary gear reducer is also designed with at least three (preferably six) elastic stop members 3. Figure 2 and Figure 4 As shown, the elastic stop 3 is axially outward (i.e. Figure 2 The outer gear ring 2 has a first protruding edge 31 (in the downward direction) for axially fixing the outer gear ring 2 to the reducer housing 1, and the inner side (i.e., the axial direction downward direction) Figure 2 (In the upward direction) there is a second protruding edge 32 for fixing itself circumferentially and radially within the mounting groove 11, and a groove 33 is provided between the first protruding edge 31 and the second protruding edge 32. For example... Figure 5 As shown, the reducer housing 1 is designed with a mounting groove 11 for installing the elastic stop 3. The mounting groove 11 has a protruding beam 111 that matches the shape of the groove 33. The radial height of the protruding beam 111 is approximately 3.5mm, which is an excellent dimension. Of course, this dimension can be changed according to actual design requirements, and its practicality is not limited. The groove 33 abuts against the protruding beam 111, axially fixing the elastic stop 3 to the reducer housing 1, thereby axially fixing the external gear ring 2 to the reducer housing 1. This technical solution avoids the traditional axial stop mechanism using a washer 5 and an elastic retaining ring 4. In the sliding state, because the second protruding edge 32 is held in place by the protruding beam 111, the entire elastic stop 3 is axially fixed, thereby axially fixing the external gear ring 2. Moreover, the structure is stable and not easily detached, improving the operational stability and safety of the planetary gear reducer.

[0022] More preferably, in Figure 2 and Figure 3 In the illustrated embodiment, the circumferential width of the elastic stop 3 is designed to be greater than the circumferential width of the mounting groove 11, and the axial width of the groove 33 is designed to be less than the axial width of the protruding beam 111. This design creates an interference fit between the elastic stop 3 and the mounting groove 11. Furthermore, the elastic stop 3 can be further fixed in the mounting groove 11 by welding or bonding, resulting in a more robust and reliable connection.

[0023] Figure 4 The elastic stop 3 designed according to this utility model is shown. The material of the elastic stop 3 is a material that can produce elastic deformation while also having a certain rigidity, such as hard rubber or elastic metal. This allows the elastic stop 3 to produce elastic deformation, facilitating assembly, while its certain rigidity prevents it from undergoing large deformation and thus preventing it from coming out of the mounting groove 11, ensuring the axial fixation of the outer gear ring 2. Combined with... Figure 2According to the present invention, the radial width of the second protruding edge of the elastic stop is smaller than the radial width of the first protruding edge. This design ensures that the first protruding edge 31 of the elastic stop 3 can be smoothly inserted into the gap between the protruding beam 111 of the mounting groove 11 and the external gear ring 2, which facilitates the assembly of the planetary gear reducer. The axial thickness of the second protruding edge 32 is greater than the axial thickness of the first protruding edge 31. This ensures that the second protruding edge 32 has sufficient strength and is not prone to deformation and falling off, thereby axially stopping the external gear ring 2 on the reducer housing 1.

[0024] Figure 5 The diagram shows a mounting groove 11 designed according to this invention. The mounting groove 11 and the radially inner side of the protruding beam 111 are designed with chamfers 112, which can be either C-corners or rounded corners. Figure 5 In the illustrated embodiment, all chamfers 112 are designed as rounded corners. The radius of the rounded corners on both sides of the mounting groove 11 is approximately 0.5 mm, and the radius of the rounded corners on the two radially inner sides of the protruding beam 111 is approximately 0.3 mm. These are excellent dimensions, but they can be changed according to actual design requirements; this invention does not limit these dimensions. The chamfer 112 design facilitates installation, improves assembly efficiency, effectively prevents scratches on the elastic stop 3, and effectively prevents stress concentration, thus increasing the service life of the elastic stop 3 and consequently improving the reliability and safety of the planetary gear reducer.

[0025] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

[0026] List of reference numerals

[0027] 1.1' Gearbox housing

[0028] 11 mounting slots

[0029] 111 Protruding beam

[0030] 112 Chamfer

[0031] 2' External gear ring

[0032] 3. Elastic stop

[0033] 31 First protruding edge

[0034] 32 Second protruding edge

[0035] 33 Grooves

[0036] 4. Elastic retaining ring

[0037] 5 Washers

Claims

1. A planetary gear reducer, comprising a reducer housing (1) and an external gear ring (2) circumferentially fixedly connected to the reducer housing (1), wherein an elastic stop (3) for axially fixing the external gear ring (2) is provided between the reducer housing (1) and the external gear ring (2), and a mounting groove (11) for accommodating the elastic stop (3) is provided inside the reducer housing (1), wherein, The elastic stop (3) has a snap-fit ​​structure, and the mounting groove (11) has a snap-fit ​​engagement structure. The snap-fit ​​structure and the snap-fit ​​engagement structure are shaped to fit together, so that the elastic stop (3) is axially fixed by the mounting groove (11).

2. The planetary gear reducer according to claim 1, characterized in that, The elastic stop (3) has a C-shaped or U-shaped structure, and the mounting groove (11) has a T-shaped structure.

3. The planetary gear reducer according to claim 2, characterized in that, The elastic stop (3) has a first protruding edge (31) on the outer side of the axial direction for axially fixing the outer gear ring (2) on the reducer housing (1). The elastic stop (3) has a second protruding edge (32) on the inner side of the axial direction for circumferentially and radially fixing itself in the mounting groove (11). A groove (33) is provided between the first protruding edge (31) and the second protruding edge (32). A protruding beam (111) that matches the shape of the groove (33) is provided on the mounting groove (11). The groove (33) abuts against the protruding beam (111) and axially fixes the elastic stop (3) on the reducer housing (1).

4. The planetary gear reducer according to claim 3, characterized in that, The radial width of the second protruding edge (32) is smaller than the radial width of the first protruding edge (31).

5. The planetary gear reducer according to claim 3, characterized in that, The axial thickness of the second protruding edge (32) is greater than the axial thickness of the first protruding edge (31).

6. The planetary gear reducer according to claim 3, characterized in that, The circumferential width of the elastic stop (3) is greater than the circumferential width of the mounting groove (11), and the axial width of the groove (33) is less than the axial width of the protruding beam (111).

7. The planetary gear reducer according to claim 3, characterized in that, The mounting groove (11) and the protruding beam (111) have chamfers (112) on their radially inner sides.

8. The planetary gear reducer according to claim 1, characterized in that, The number of the elastic stop (3) is at least 3.

9. The planetary gear reducer according to claim 1, characterized in that, The elastic stop (3) is further fixed in the mounting groove (11) by welding or bonding.

10. A vehicle having a planetary gear reducer according to any one of claims 1 to 9.

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