Cam bearing harmonic reducer

Abstract

The utility model discloses a cam bearing harmonic reducer which comprises a rigid gear and a flexible gear which are correspondingly connected with an inner ring and an outer ring of a crossed bearing respectively, the outer ring of the flexible gear is provided with outer teeth used for being meshed with the rigid gear for driving, and a flexible cam bearing assembly used for driving the flexible gear is concentrically arranged in the flexible gear. The flexible cam bearing assembly comprises a bearing inner ring and a bearing outer ring, the bearing inner ring and the bearing outer ring are matched through a roller assembly, and the bearing inner ring is rotated to drive the bearing outer ring and the flexible gear to deform for transmission. The cam bearing assembly is directly used for driving the flexible gear, so that the bearing inner ring and the cam of the harmonic reducer form an integrated structure, the outline of the bearing outer ring is closer to a theoretical state, and the product precision can be improved; and meanwhile, the phenomenon that in the prior art, the flexible bearing falls off due to the fact that the interference magnitude of the flexible bearing is insufficient or the bonding strength of glue is insufficient is avoided.

Description

Technical Field

[0001] This utility model relates to the field of harmonic reducer technology, specifically to a cam bearing harmonic reducer. Background Technology

[0002] Harmonic reducers rely on the rotation of a cam to drive a flexible wheel, which in turn, deforms elastically and meshes with a rigid wheel, causing the rigid wheel to rotate. Existing systems connect the flexible bearing and the cam using interference fit or adhesive bonding. However, in some cases, insufficient interference fit or inadequate adhesive strength can lead to the flexible bearing detaching. This technology can solve the problem of bearing detachment caused by excessive axial force. Utility Model Content

[0003] Technical objective: To address the shortcomings of existing harmonic reducer structures, this utility model discloses a cam bearing harmonic reducer.

[0004] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution:

[0005] A cam bearing harmonic reducer includes a rigid wheel and a flexible wheel that are respectively connected to the inner and outer rings of a cross bearing. The outer ring of the flexible wheel is provided with external teeth for meshing with the rigid wheel to drive it. A flexible cam bearing assembly for driving the flexible wheel is concentrically arranged inside the flexible wheel. The flexible cam bearing assembly includes an inner bearing ring and an outer bearing ring, which are engaged by a roller assembly. The transmission is achieved by rotating the inner bearing ring to drive the outer bearing ring and the flexible wheel to deform.

[0006] Preferably, the inner ring of the bearing of this invention has a raised end that intermittently contacts the outer ring of the bearing as it rotates.

[0007] Preferably, the inner ring of the bearing of this invention has an elliptical profile structure.

[0008] Preferably, the roller assembly of this utility model includes a cage disposed on the outer periphery of the inner ring of the bearing and a roller installed in the cage. The roller is rotatably engaged with the cage, and the outer periphery of the roller abuts against the outer ring of the bearing. A groove is provided on the outer ring of the bearing to engage with the roller.

[0009] Preferably, the cross bearing of this utility model includes an inner ring of the cross bearing, an outer ring of the cross bearing, and a cylindrical roller disposed between the inner ring and the outer ring of the cross bearing. A threaded hole is provided on the end face of the inner ring of the cross bearing, and the rigid roller is connected to the threaded hole by a screw passing through it to complete the fixation with the inner ring of the cross bearing.

[0010] Preferably, the flexible wheel of this utility model has a top hat-shaped structure, with the larger diameter end located on the side of the cross bearing away from the end of the rigid wheel, and fixedly connected to the outer ring of the cross bearing at the end face of the cross bearing by screws, and the smaller diameter end extending from the inner ring of the cross bearing to the inner circumference of the rigid wheel.

[0011] Beneficial effects: The cam bearing harmonic reducer disclosed in this utility model has the following beneficial effects:

[0012] 1. This utility model directly utilizes a cam bearing assembly to drive the flexible wheel, making the inner ring of the bearing and the cam of the harmonic reducer form an integrated structure, making the profile of the outer ring of the bearing closer to the theoretical state, which is beneficial to improving product accuracy; at the same time, it avoids the phenomenon of flexible bearing falling off due to insufficient interference or insufficient adhesive bonding strength in the prior art.

[0013] 2. This utility model can eliminate the step of press-fitting flexible bearings, improve the assembly efficiency of harmonic reducers, and avoid the bearing jamming that occurs after press-fitting in the original assembly between flexible bearings and cams. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0015] Figure 1 This is a cross-sectional view of the harmonic reducer of this utility model;

[0016] Among them, 1-rigid wheel, 2-flexible wheel, 3-bearing inner ring, 4-bearing outer ring, 5-cage, 6-roller, 7-cross bearing inner ring, 8-cross bearing outer ring, 9-cylindrical roller, 10-threaded hole. Detailed Implementation

[0017] Reference will now be made in detail to embodiments of the present disclosure, one or more of which are set forth herein. Each embodiment and example is provided by way of explanation of the apparatus, composition, and materials of the present disclosure, and not by way of limitation. Rather, the following description provides convenient illustrations for implementing exemplary embodiments of the present disclosure. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made to the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0018] like Figure 1As shown, this utility model discloses a cam bearing harmonic reducer, including a rigid wheel 1 and a flexible wheel 2 respectively connected to the inner and outer rings of a cross bearing. The outer ring of the flexible wheel 2 is provided with external teeth for meshing with the rigid wheel 1 for driving. A flexible cam bearing assembly for driving the flexible wheel is concentrically arranged inside the flexible wheel 2. The flexible cam bearing assembly includes an inner bearing ring 3 and an outer bearing ring 4. The inner bearing ring 3 and the outer bearing ring 4 are connected by a roller assembly. By rotating the inner bearing ring 3, the outer bearing ring 4 and the flexible wheel 2 are deformed to achieve transmission.

[0019] The harmonic reducer structure of this utility model eliminates the need for press-fitting and connecting cams and flexible bearings. The inner ring 3 of the bearing has a raised end that intermittently contacts the outer ring 4 of the bearing as it rotates, preferably with an elliptical contour structure. This allows for direct transmission by connecting the corresponding rotating shaft through the inner ring 3 of the bearing. This avoids the problem of flexible bearing detachment that occurs in traditional cam and flexible bearing transmissions, while also reducing assembly steps and improving the assembly efficiency of the harmonic reducer.

[0020] The roller assembly of this utility model includes a cage 5 disposed on the outer periphery of the inner ring 3 of the bearing and rollers 6 installed in the cage 5. The rollers 6 are rotatably engaged with the cage 5, and the outer periphery of the rollers 6 abuts against the outer ring 4 of the bearing. The outer ring 4 of the bearing is provided with a groove that engages with the rollers 6. The relative position between the rollers 6 is maintained by the cage 5, which can also reduce the wear on the flexible cam bearing assembly during the transmission of the inner ring of the bearing.

[0021] The cross bearing of this utility model includes an inner ring 7, an outer ring 8, and cylindrical rollers 9 disposed between the inner and outer rings 7 and 8. A threaded hole 10 is provided on the end face of the inner ring 7. The rigid wheel 1 is connected to the threaded hole 10 via a through screw, thus fixing it to the inner ring 7. The flexible wheel 2 has a top-hat shaped structure. The larger diameter end is located on the side of the cross bearing away from the rigid wheel 1, and is fixedly connected to the outer ring 8 at the end face of the cross bearing via screws. The smaller diameter end extends from the inner ring 7 to the inner circumference of the rigid wheel. After the connection of the flexible wheel 2, the rigid wheel 1, and the cross bearing is completed, the reducer can be driven. When the flexible wheel 2 is fixed, the rigid wheel 1 outputs power; when the rigid wheel 1 is fixed, the flexible wheel 2 outputs power.

[0022] In use, the inner ring 3 of the bearing is connected to the corresponding input shaft. When the input shaft rotates, since the inner ring 3 of the bearing has an elliptical structure, the different deformation positions of the flexible wheel during its rotation can be used to make the flexible wheel and the rigid wheel perform differential tooth motion, thereby realizing the operation of the harmonic reducer. Depending on the output requirements, one of the components, either the rigid wheel or the flexible wheel, can be used as a fixed component, while the other component can be used as an output component to achieve the purpose of speed reduction output.

[0023] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A cam bearing harmonic reducer, characterized in that, It includes a rigid wheel (1) and a flexible wheel (2) that are respectively connected to the inner and outer rings of the cross bearing. The outer ring of the flexible wheel (2) is provided with external teeth for meshing with the rigid wheel (1) for driving. A flexible cam bearing assembly for driving the flexible wheel is concentrically arranged inside the flexible wheel (2). The flexible cam bearing assembly includes an inner ring (3) and an outer ring (4). The inner ring (3) and the outer ring (4) are connected by a roller assembly. The transmission is achieved by rotating the inner ring (3) to drive the outer ring (4) and the flexible wheel (2) to deform. The inner ring (3) of the bearing has a protruding end that intermittently contacts the outer ring (4) of the bearing as it rotates; The bearing inner ring (3) has an elliptical profile structure.

2. The cam bearing harmonic reducer according to claim 1, characterized in that, The roller assembly includes a cage (5) disposed on the outer periphery of the inner ring (3) of the bearing and a roller (6) installed in the cage (5). The roller (6) rotates with the cage (5), and the outer periphery of the roller (6) abuts against the outer ring (4) of the bearing. A groove is provided on the outer ring (4) of the bearing to cooperate with the roller (6).

3. The cam bearing harmonic reducer according to claim 1, characterized in that, The cross bearing includes an inner ring (7), an outer ring (8), and a cylindrical roller (9) disposed between the inner ring (7) and the outer ring (8). A threaded hole (10) is provided on the end face of the inner ring (7). The rigid wheel (1) is connected to the threaded hole (10) by a screw, thus completing the fixation with the inner ring (7).

4. A cam bearing harmonic reducer according to claim 3, characterized in that, The flexible wheel (2) has a top hat-shaped structure. The larger diameter end is located on the side of the cross bearing away from the rigid wheel (1). It is fixedly connected to the outer ring (8) of the cross bearing at the end face of the cross bearing by screws. The smaller diameter end extends from the inner ring (7) of the cross bearing to the inner circumference of the rigid wheel.

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