Sealing structure, speed reducer and tricycle

Abstract

The utility model provides a sealing structure, a speed reducer and a tricycle, which comprises sealing bearings arranged in a shaft hole, and a transmission shaft arranged between the two sealing bearings in a penetrating manner; the sealing cover is buckled to the end face of the sealing bearing, abuts against the inner side face of the shaft hole and is used for sealing the shaft hole. And the fixing piece is arranged on the sealing cover, connected with the shaft hole and used for fixedly installing the sealing cover in the shaft hole. The stability of the sealing cover in the shaft hole is improved under the action of the fixing piece, the sealing cover is still guaranteed to be located in the shaft hole under the internal pressure of the speed reducer, the whole sealing structure is more stable, the possibility of loosening or falling caused by the internal pressure or external vibration is reduced, and the service life of the sealing cover is prolonged. The working stability of the speed reducer is further improved, the workload of regular inspection and lubricating oil supplement is indirectly reduced, and meanwhile the risk that other parts are damaged due to oil leakage is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of speed reducers, in particular to a sealing structure, a speed reducer and a tricycle. Background Technique

[0002] As an environment-friendly and clean energy tool, an electric tricycle can not only promote the low-carbon development of the transportation industry, reduce transportation costs, but also flexibly pass through narrow roads and is widely used in various short-distance transportation fields. The electric tricycle is mainly powered by a brushed or brushless motor, and a speed reducer is used to match the speed between the motor and the wheels, and a gear pair in the speed reducer is used to increase the torque output.

[0003] In order to prevent the ends of the transmission shafts in the speed reducer of the electric tricycle from being exposed, a cover plate is usually installed at the end of the transmission shaft. However, the structure of the cover plate is relatively simple and is easily disengaged from the end of the transmission shaft when subjected to the internal pressure of the speed reducer, resulting in oil leakage, thereby reducing the working stability of the speed reducer and polluting the surrounding environment. Summary of the Utility Model

[0004] Aiming at the deficiencies in the prior art, the utility model provides a sealing structure, which solves the problems that the cover plate structure at the end of the transmission shaft in the prior art is relatively simple, is easily disengaged from the end of the transmission shaft when subjected to the internal pressure of the speed reducer, resulting in oil leakage, reducing the working stability of the speed reducer and polluting the surrounding environment.

[0005] According to the embodiments of the utility model, the following technical solutions are adopted:

[0006] A sealing structure is installed in a shaft hole and is located at the end of a transmission shaft, and includes:

[0007] A sealing bearing is arranged in the shaft hole, and the transmission shaft passes through between the two sealing bearings;

[0008] A sealing cover is buckled on the end face of the sealing bearing and abuts against the inner side face of the shaft hole for sealing the shaft hole; and

[0009] A fixing member is arranged on the sealing cover and is connected to the shaft hole for fixedly installing the sealing cover on the shaft hole.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] In this solution, with the cooperation of the sealing cover and the sealing bearing, by directly snapping the sealing cover into the shaft hole, the leakage of lubricating oil inside the reducer can be effectively prevented, thus avoiding environmental pollution caused by oil leakage. At the same time, under the action of the fixing member, the stability of the sealing cover in the shaft hole is increased, and the sealing cover is still ensured to be inside the shaft hole when subjected to the internal pressure of the reducer, making the entire sealing structure more stable, reducing the possibility of loosening or falling off due to internal pressure or external vibration, further improving the working stability of the reducer, indirectly reducing the workload of regularly checking and replenishing lubricating oil, and at the same time reducing the risk of damage to other components caused by oil leakage.

[0012] Preferably, the fixing member includes a mounting portion coaxially arranged with the sealing cover and fixing blocks arranged circumferentially along the mounting portion. A fixing groove is provided on the inner side surface of the shaft hole. When the sealing cover is snapped onto the shaft hole, the fixing blocks are clamped in the fixing groove.

[0013] Preferably, one side of the fixing block close to the sealing bearing has a first guiding inclined surface, and the first guiding inclined surface fits against the inner side surface of the fixing groove.

[0014] Preferably, a positioning ring is clamped in the shaft hole, and both the sealing cover and the sealing bearing abut against the positioning ring.

[0015] Preferably, a positioning groove corresponding to the positioning ring is provided on the inner side surface of the shaft hole, and the positioning ring is clamped in the positioning groove.

[0016] Preferably, the edge of the mouth of the shaft hole extends radially to form a second guiding inclined surface.

[0017] Preferably, a skeleton is installed between the sealing cover and the mounting portion.

[0018] According to the embodiments of the present invention, the present invention also adopts the following technical solutions:

[0019] A reducer includes a sealing structure.

[0020] A tricycle includes a reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic plan structure diagram of an embodiment of the present invention.

[0022] Figure 2 is Figure 1 a partially enlarged structural diagram of

[0023] Figure 3 is a partially enlarged structural diagram of the shaft hole.

[0024] Figure 4 is Figure 1 an enlarged structural diagram of area A in

[0025] In the above-mentioned drawings: 1. Transmission shaft; 2. Sealed bearing; 3. Sealing cover; 301. Fixed block; 302. First guiding inclined surface; 303. Framework; 304. Fixed groove; 305. Mounting part; 4. Positioning ring; 5. Shaft hole; 501. Positioning groove; 502. Second guiding inclined surface. Detailed implementation mode

[0026] The technical solutions in the present invention will be further described below in conjunction with the drawings and embodiments.

[0027] As Figure 1 Shown in Figure 2 As shown, an embodiment of the present invention provides a sealing structure, which is installed in the shaft hole 5 and located at the end of the transmission shaft 1, and includes:

[0028] A sealed bearing 2 is arranged in the shaft hole 5, and the transmission shaft 1 passes through between the two sealed bearings 2;

[0029] A sealing cover 3 is buckled on the end face of the sealed bearing 2 and abuts against the inner side face of the shaft hole 5 for sealing the shaft hole 5; and

[0030] A fixing member is arranged on the sealing cover 3 and connected to the shaft hole 5 for fixedly installing the sealing cover 3 in the shaft hole 5.

[0031] In the embodiment of the present invention, the sealed bearing 2 is used to carry the transmission shaft 1. Compared with ordinary bearings, the sealed bearing 2 can play a preliminary sealing role. With the cooperation of the sealing cover 3, when the sealed bearing 2 and the transmission shaft 1 are assembled as a whole, the sealing cover 3 can be directly buckled in the shaft hole 5 to quickly seal the end of the transmission shaft 1 and the sealed bearing 2, effectively preventing the lubricating oil inside the reducer from leaking, thus avoiding environmental pollution caused by oil leakage.

[0032] Secondly, under the action of the fixing member, the stability of the sealing cover 3 in the shaft hole 5 is increased. When under the internal pressure of the reducer, the sealing cover 3 is still ensured to be inside the shaft hole 5, making the whole sealing structure more stable, reducing the possibility of loosening or falling off caused by internal pressure or external vibration, further improving the working stability of the reducer, indirectly reducing the workload of regularly checking and replenishing lubricating oil, and at the same time reducing the risk of damage to other components caused by oil leakage. After the sealing cover 3 is installed, its end face is lower than the mouth of the shaft hole 5, making the whole more beautiful.

[0033] Specifically, as Figure 3As shown in the figure, the fixing member includes an installation portion 305 coaxially arranged with the sealing cover 3 and fixing blocks 301 arranged circumferentially along the installation portion 305. A fixing groove 304 is formed on the inner side surface of the shaft hole 5. When the sealing cover 3 is buckled to the shaft hole 5, the fixing blocks 301 are clamped in the fixing groove 304. Since a certain pressure will be generated when the internal transmission system of the box body works, the pressure will gradually be transmitted to the position of the sealing cover 3. In order to prevent the sealing cover 3 from falling out of the shaft hole 5, with the cooperation of the fixing blocks 301 in the fixing member, when the sealing cover 3 is pressed and buckled onto the shaft hole 5, the fixing blocks 301 on the sealing cover 3 are clamped into the fixing groove inside the shaft hole 5, performing axial limitation on the fixing blocks 301 to ensure that the sealing cover 3 is more stably installed under the action of the fixing blocks 301. Among them, the fixing blocks 301 can be made of elastic material so as to be clamped into the fixing groove from outside the shaft hole 5.

[0034] At the same time, one side of the fixing block 301 close to the sealing bearing 2 has a first guiding inclined surface 302, and the first guiding inclined surface 302 fits against the inner side surface of the fixing groove. The fixing block 301 has a wedge-shaped structure, and its first guiding inclined surface 302 is close to the sealing bearing 2. When installing the sealing cover 3, the first guiding inclined surface 302 directly contacts the edge of the shaft hole 5, which can help the fixing block 301 to be better guided into place during the assembly process, reduce the assembly difficulty, and ensure the position accuracy during installation. After the sealing cover 3 is installed, self-locking can be completed under the action of the opposite surface of the first guiding inclined surface 302.

[0035] Specifically, as Figure 2 shown, a positioning ring 4 is clamped in the shaft hole 5, and both the sealing cover 3 and the sealing bearing 2 are abutted against the positioning ring 4. The positioning ring 4 has an open elastic structure. When installing the positioning ring 4, the inner diameter of the positioning ring 4 can be reduced by compressing the positioning ring 4, so that it can quickly enter the shaft hole 5, and by releasing the positioning ring 4, the positioning ring 4 elastically returns to abut against the side surface of the shaft hole 5. Under the action of the positioning ring 4, an accurate positioning reference point can be provided, so that the sealing cover 3 and the sealing bearing 2 can be correctly placed in the predetermined position. During assembly, it is only necessary to ensure that each component is installed in place in sequence and abutted against the positioning ring 4, which simplifies the assembly process. Moreover, as an intermediate support member, the positioning ring 4 can increase the stability of the sealing bearing 2 and the sealing cover 3 and reduce their axial movement. Especially when the vehicle encounters bumps during driving, it can better maintain the position stability of the sealing assembly.

[0036] In order to further improve the installation strength of the positioning ring 4, as Figure 2As shown, a positioning groove 501 corresponding to the positioning ring 4 is provided on the inner side surface of the shaft hole 5, and the positioning ring 4 is snap-fitted into the positioning groove 501. When installing the positioning ring 4, snapping the positioning ring 4 into the positioning groove 501 can ensure that its position remains fixed, avoiding axial or radial movement of the positioning ring 4 within the shaft hole 5. At the same time, the structural stability of the positioning ring 4 is increased. Especially when the vehicle encounters impacts or vibrations during driving, it can better maintain the integrity of the sealing structure. Moreover, the positioning groove 501 can provide certain assembly guidance, making the precise installation of the positioning ring 4 more intuitive and easier, improving the assembly efficiency.

[0037] Specifically, as Figure 2 shown, a second guiding inclined surface 502 is formed by the edge of the opening of the shaft hole 5 extending radially. The second guiding inclined surface 502 makes the opening of the shaft hole 5 in an outwardly expanding shape. Using the second guiding inclined surface 502 as the guiding surface during assembly can help the sealing cover 3 more easily align and be installed into the shaft hole 5, reducing the alignment difficulty during assembly and making the assembly process smoother.

[0038] Specifically, as Figure 2 shown, a skeleton 303 is installed between the sealing cover 3 and the mounting portion 305. The skeleton 303 can support the overall structure of the sealing cover 3, further increasing the overall rigidity of the sealing cover 3.

[0039] In another embodiment of the present utility model, a speed reducer including the above sealing structure and a tricycle including the above speed reducer are also disclosed. The specific structure of this sealing structure refers to the above embodiment. Since the speed reducer and the tricycle adopt all the technical solutions of the above embodiment, they at least have all the beneficial effects brought by the technical solutions of the above embodiment, which will not be elaborated here one by one.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not restrictive. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model.

Claims

1. A sealing structure, installed in a shaft hole (5) and located at the end of a transmission shaft (1), characterized in that: include: A sealed bearing (2) is arranged in the shaft hole (5), and the transmission shaft (1) is passed through two of the sealed bearings (2); A sealing cover (3) is buckled onto the end surface of the sealing bearing (2) and abuts against the inner side surface of the shaft hole (5) to seal the shaft hole (5); and A fixing member is provided on the sealing cover (3) and is connected to the shaft hole (5), and is used for fixing the sealing cover (3) to the shaft hole (5).

2. A sealing structure according to claim 1, characterized in that: The fixing member comprises a mounting portion (305) coaxially arranged with the sealing cover (3) and a fixing block (301) arranged circumferentially along the mounting portion (305); a fixing groove (304) is provided on the inner side surface of the shaft hole (5); when the sealing cover (3) is buckled into the shaft hole (5), the fixing block (301) is snap-fitted into the fixing groove (304).

3. A sealing structure according to claim 2, characterized in that: The fixing block (301) has a first guiding inclined surface (302) on one side close to the sealing bearing (2), and the first guiding inclined surface (302) is fitted to the inner side surface of the fixing groove (304).

4. A sealing structure according to claim 1, characterized in that: A positioning ring (4) is clamped in the shaft hole (5), and the sealing cover (3) and the sealing bearing (2) are both in contact with the positioning ring (4).

5. A sealing structure according to claim 4, characterized in that: A positioning groove (501) corresponding to the positioning ring (4) is formed on the inner side surface of the shaft hole (5), and the positioning ring (4) is snap-fitted into the positioning groove (501).

6. A sealing structure according to claim 1, characterized in that: The edge of the mouth of the shaft hole (5) extends in its radial direction to form a second guiding inclined surface (502).

7. A sealing structure according to claim 2, characterized in that: A frame (303) is installed between the sealing cover (3) and the installation portion (305).

8. A reducer, characterized in that: It comprises a sealing structure according to any one of claims 1-7.

9. A tricycle, characterized in that: It comprises a reducer according to claim 8.

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