A harmonic generator
By integrating the bearing and the inner ring of the flexible bearing into a single design, and adopting an elliptical raceway and pocket structure, the problem of insufficient accuracy in existing harmonic generators is solved, achieving a high-precision and high-strength harmonic generator design, and improving the overall performance of the reducer.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG XIMIKE BEARING
- Filing Date
- 2025-07-09
- Publication Date
- 2026-07-03
AI Technical Summary
The existing harmonic generators have poor structural accuracy and short lifespan, mainly due to insufficient accuracy and deviation caused by the elliptical deformation pressing process of the inner ring of the flexible bearing.
Design a harmonic generator that integrates the bearing and the inner ring of the flexible bearing, adopts an elliptical raceway and pocket structure to reduce the pressing process, increase the stability of the steel balls, and improves the strength through reinforcing bars and transition sections, thereby achieving concentricity and precision between the bearing inner ring and the generator body.
It improves the overall accuracy and lifespan of the harmonic generator, reduces weight, enhances structural strength, ensures dimensional accuracy and concentricity, and improves the overall performance of the reducer.
Smart Images
Figure CN224453575U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bearing machinery technology, and more specifically to a harmonic generator. Background Technology
[0002] Flexible-rigid gear meshing transmission: The flexible gear is a thin-walled elastic gear with an outer diameter slightly smaller than the inner diameter of the rigid gear. Under the action of the wave generator, the flexible gear undergoes periodic deformation, causing the teeth of the flexible gear and the rigid gear to mesh with each other in a specific area. As the wave generator rotates continuously, the deformation area of the flexible gear changes continuously, and the meshing point moves along the circumference. Due to the difference in the number of teeth between the flexible and rigid gears, when the wave generator rotates once, the flexible gear will produce a small angular displacement relative to the rigid gear, thereby achieving speed reduction. For example, in a dual-wave transmission, if the flexible gear has two fewer teeth than the rigid gear, when the wave generator rotates once, the flexible gear moves two teeth relative to the rigid gear. In this way, a larger reduction ratio can be achieved.
[0003] Existing harmonic generators are elliptical in shape. By pressing in a flexible bearing, the inner ring of the bearing becomes elliptical, thereby deforming the outer ring of the bearing and causing controllable elastic deformation of the flexible wheel. This deformation interacts with the steel wheel to achieve motion and power transmission. This structure has relatively poor precision and a short lifespan. Utility Model Content
[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a harmonic generator with a reasonable structure and high precision.
[0005] A harmonic generator includes a generator body and a bearing. The bearing includes an outer ring, a cage, and multiple steel balls, which are fitted into pockets on the cage. Multiple elliptical raceways are provided on one side of the outer circumference of the generator body. One side of each steel ball is fitted within one of the elliptical raceways, and the other side is fitted with the outer ring. The bearing and one end face of the generator body are spaced apart, and the outer diameter of the outer ring is slightly smaller than the outer diameter of the generator body. The structure is reasonable; the harmonic generator and the inner ring of the flexible bearing are designed as a single product, thus reducing weight, simplifying the pressing process, and increasing precision.
[0006] As a further improvement and supplement to the above solution, this utility model also includes the following additional technical features:
[0007] The pocket is an arc-shaped hole exceeding a semicircle, and the outer side of the pocket is provided with reinforcing strips that are concave arcs on both sides and spaced apart. The structure is reasonable and has good strength.
[0008] The elliptical raceways consist of four sections, with four corresponding pockets. The structure is reasonable and meets the usage requirements.
[0009] The generator body has a keyway for connection, and an annular groove on one side of its outer surface. This allows for convenient and quick connection with shaft-like parts, provides good positioning accuracy, and the groove ensures machining quality.
[0010] The pocket has oblique transition sections on both sides, which further increases its strength.
[0011] The following benefits can be achieved by using this utility model: the structure is reasonable, and the harmonic generator and the inner ring of the flexible bearing are designed as a whole on one product, which reduces weight, reduces pressing process, and increases precision.
[0012] The harmonic generator and the flexible bearing inner ring are integrated, and the elliptical raceway design achieves the function of adding a wave generator to the bearing inner ring without the need for press-fitting, ensuring dimensional accuracy and better concentricity. This reduces the deviation of the bearing inner ring raceway, combined with the deviation of the wave generator and the deviation during press-fitting, thus significantly improving the overall accuracy of the harmonic reducer. Attached Figure Description
[0013] Figure 1 This is the front view of this utility model.
[0014] Figure 2 This is the left view of this utility model.
[0015] Figure 3 This is a front view of the generator body 1 in this utility model.
[0016] Figure 4 This is a left view of the generator body 1 in this utility model.
[0017] Figure 5 This is a schematic diagram of the structure of the cage 22 in this utility model.
[0018] Figure 6 This is a front view of the cage 22 in this utility model. Detailed Implementation
[0019] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0020] like Figure 1-6 As shown, this utility model is a harmonic generator.
[0021] The harmonic generator described in this embodiment includes a generator body 1 and a bearing 2. The generator body 1 has two sets of annular threaded holes for connection. The bearing 2 includes an outer ring 21, a cage 22, and multiple steel balls 23. The steel balls 23 are fitted into pockets 221 on the cage 22. Multiple elliptical raceways 11 are provided on one side of the outer circumference of the generator body 1. The elliptical raceways enable the bearing inner ring to generate a wave. One side of the steel balls 23 is fitted into the elliptical raceway 11, and the other side is fitted into the outer ring 21. The distance between the end faces of the bearing 2 and the generator body 1 is set such that the outer diameter of the outer ring 21 is slightly smaller than the outer diameter of the generator body 1. This effectively protects the generator body 1 and avoids contact interference between the outer ring 21 and the generator body 1.
[0022] Furthermore, the pocket 221 is an arc-shaped hole exceeding a semicircle, and the outer side of the pocket 221 is provided with reinforcing strips 222 that are spaced apart and have concave arc shapes on both sides. Because the pocket 221 is an arc-shaped hole exceeding a semicircle, the steel ball 23 is placed stably and reliably.
[0023] Furthermore, there are four elliptical raceways 11 and four corresponding pockets 221. The four elliptical raceways 11 are symmetrically distributed.
[0024] Furthermore, the generator body 1 is provided with a keyway 13 for connection, and an annular groove 12 is provided on one side of the outer circular surface. The groove 12 is provided to prevent the grinding wheel from contacting the generator body 1, to give it space, and to ensure the machining quality of the generator body 1.
[0025] Furthermore, the pocket 221 is provided with oblique transition sections on both sides. The transition sections are provided to increase strength and ensure the elasticity of the pocket 221.
[0026] When this harmonic generator is in use, the main body 1 of the harmonic generator and the inner ring of the flexible bearing are integrated, eliminating the need for pressing. This ensures dimensional accuracy and improves concentricity, thus significantly improving the overall accuracy of the harmonic reducer. Specifically, the elliptical raceway 11, outer ring 21, and pocket 221 are used to fix four steel balls 23, reducing weight and eliminating the need for the inner ring of the flexible bearing to become elliptical. The outer circle on the harmonic generator functions as the inner ring, ensuring dimensional accuracy and improving concentricity, thereby significantly improving the overall accuracy of the harmonic reducer.
[0027] The above are preferred embodiments of the present utility model and do not limit the scope of protection of the present utility model. Any modifications and improvements made by those skilled in the art based on the design concept of the present utility model should be considered within the scope of protection of the present utility model.
Claims
1. A harmonic generator comprising a generator body (1) and a bearing (2), characterized in that: The bearing (2) includes an outer ring (21), a cage (22) and a plurality of steel balls (23). The steel balls (23) are fitted into pockets (221) on the cage (22). On one side of the outer circular surface of the generator body (1), a plurality of elliptical raceways (11) are provided. One side of the steel balls (23) is fitted into the elliptical raceways (11), and the other side is fitted into the outer ring (21). The bearing (2) and one side end face of the generator body (1) are set at a distance, and the outer diameter of the outer ring (21) is slightly smaller than the outer diameter of the generator body (1).
2. The harmonic generator of claim 1, wherein: The pocket (221) is an arc hole that exceeds a semicircle, and the outer side of the pocket (221) is provided with reinforcing strips (222) that are concave arcs on both sides and are spaced apart.
3. The harmonic generator of claim 2, wherein: There are four elliptical raceways (11) and four matching pockets (221).
4. The harmonic generator of claim 1, wherein: The generator body (1) is provided with a keyway (13) for connection, and an annular groove (12) is provided on one side of the outer circular surface.
5. The harmonic generator of claim 1, wherein: The pocket (221) has oblique transition sections on both sides.