High-bearing-capacity hat-shaped flexible gear structure

Abstract

The utility model discloses a high-bearing-capacity hat-shaped flexible gear structure which comprises a thin-wall cylinder A and a thin-wall cylinder B. The size of the thin-wall cylinder A is smaller than that of the thin-wall cylinder B. The thin-wall cylinder A and the thin-wall cylinder B are connected in the radial direction through a thin-wall web A. The open end of the thin-wall cylinder A is an input end, an inner hole of the input end is a wave generator installation opening, and a transmission gear is arranged on the outer circle of the wave generator installation opening. The open end of the thin-wall cylinder B is an output end, the output end is provided with an output connecting flange, and the output connecting flange is radially connected with the thin-wall cylinder B through a thin-wall web B and extends outwards in the radial direction. After the technical scheme is adopted, the stress condition of the hat-shaped flexible gear is changed, and according to a flexible gear thin-shell theory and finite element simulation analysis and calculation, under the condition that gear parameters are the same as the axial size L of the flexible gear, the stress condition of the hat-shaped flexible gear is changed. The bearing capacity of the flexible gear structure is improved by 32-48% or even higher on the original basis, and the service life of the flexible gear is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a high bearing capacity top hat type flexspline structure and belongs to the technical field of harmonic reducer. BACKGROUND

[0002] Harmonic gear transmission is a kind of gear transmission mode using the elastic deformation of flexible gear for motion or power transmission. The harmonic gear transmission is mainly composed of three basic components, i.e. a flexspline (flexible gear), a rigid gear and a wave generator. The transmission of motion or power is achieved by continuously deforming the flexspline under the action of the wave generator and interacting with the rigid gear.

[0003] The working principle of the harmonic gear transmission is as follows: when the cam wave generator with flexible bearing is installed in the inner hole of the thin-walled flexspline, the thin-walled flexspline is forced to deform elastically, the teeth at both ends of the long axis of the flexspline are fully engaged with the teeth of the rigid gear, while the teeth at the short axis are completely disengaged, and the teeth in different sections between the long axis and the short axis are engaged or disengaged; when the wave generator continuously rotates, the wave generator continuously converts the deformation of the flexspline, and the teeth of the flexspline are sequentially converted from engagement to disengagement, from disengagement to disengagement, from disengagement to engagement, and from engagement to engagement, so as to realize the rotation of the flexspline relative to the rigid gear in the opposite direction of the wave generator.

[0004] At present, the flexible gear in the harmonic gear transmission mainly has three structural forms of thin-walled circular ring, cup and top hat. Since the stress increase of the top hat harmonic flexspline under the condition of load increase is much lower than that of the thin-walled straight cylinder and cup flexspline, the top hat harmonic flexspline is more suitable for application under large load working conditions.

[0005] However, the top hat harmonic flexspline in the prior art often has the phenomenon of rupture at the transition fillet between the cylinder bottom and the cover plate during use. The reason for the rupture is that the maximum stress in the long axis direction and the short axis direction of the cam wave generator appears at the transition fillet between the cylinder bottom and the cover plate during use, and when the stress exceeds the allowable value, the rupture phenomenon occurs.

[0006] Therefore, the top hat harmonic flexspline in the prior art still has deficiencies and needs to be further improved. SUMMARY

[0007] The utility model aims at providing a high bearing capacity top hat type flexspline structure to overcome the deficiencies of the top hat flexspline in the prior art.

[0008] The utility model discloses a technical scheme: a high bearing capacity top hat shape flexible wheel structure, including thin -walled cylinder A and thin -walled cylinder B, the size of thin -walled cylinder A is less than the size of thin -walled cylinder B, and thin -walled cylinder A and thin -walled cylinder B are connected through thin -walled web A radially, and the open end of thin -walled cylinder A is input end, and the inner hole of input end is wave generator installation mouth, and the outer circle of wave generator installation mouth is equipped with transmission gear, and the open end of thin -walled cylinder B is output end, and output end is equipped with output connection flange, and output connection flange is connected through thin -walled web B radially with thin -walled cylinder B and radially extends outward.

[0009] In the high bearing capacity top hat shape flexible wheel structure, the diameter d1 of the thin-walled cylinder A and the diameter d2 of the thin-walled cylinder B have a relationship of d2=(1.24-1.36)d1.

[0010] In the high bearing capacity top hat shape flexible wheel structure, the opening size d of the output end of the thin-walled cylinder B and the diameter d1 of the thin-walled cylinder A have a relationship of d=(1.42-1.48)d1.

[0011] In the high bearing capacity top hat shape flexible wheel structure, the diameter D of the output connection flange and the diameter d1 of the thin-walled cylinder A have a relationship of D=(1.68-1.76)d1.

[0012] In the high bearing capacity top hat shape flexible wheel structure, the axial size L1 of the thin-walled cylinder A and the axial size L of the flexible wheel have a relationship of L1=(0.52-0.64)L.

[0013] In the high bearing capacity top hat shape flexible wheel structure, the axial size L2 of the thin-walled cylinder B and the axial size L of the flexible wheel have a relationship of L2=(0.18-0.27)L.

[0014] Compared with the prior art, the stress condition of the top hat shape flexible wheel is changed after the technical scheme is adopted, and according to the flexible gear thin shell theory and finite element simulation analysis and calculation, it is shown that, under the condition that the gear parameters and the axial size L of the flexible wheel are the same, the bearing capacity of the flexible wheel structure of the utility model will be increased by 32-48% or even higher on the basis of the original, and the service life of the flexible wheel is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic view of the utility model;

[0016] Figure 2 is a structural schematic view of the top hat shape flexible wheel in the prior art.

[0017] Reference numerals: 1-thin-walled cylinder A, 2-thin-walled cylinder B, 3-thin-walled web A, 4-wave generator mounting port, 5-driving gear, 6-thin-walled web B, 7-output connecting flange. DETAILED DESCRIPTION

[0018] The utility model is further described below in combination with the drawings and examples, but is not taken as the basis for limiting the utility model.

[0019] The embodiment of the utility model: a high bearing capacity top hat shape flexible wheel structure, including thin-walled cylinder A1 and thin-walled cylinder B2, the size of thin-walled cylinder A1 is less than the size of thin-walled cylinder B2, and thin-walled cylinder A1 and thin-walled cylinder B2 are connected by thin-walled web A3 in the radial direction, the open end of thin-walled cylinder A1 is input end, and the inner hole of input end is wave generator mounting port 4, and the outer circle of wave generator mounting port 4 is equipped with driving gear 5, the open end of thin-walled cylinder B2 is output end, and output end is equipped with output connecting flange 7, and output connecting flange 7 is connected with thin-walled cylinder B2 by thin-walled web B6 in the radial direction and extends radially outward.

[0020] The utility model discloses an improved structure of a hat-shaped flexible gear, which comprises a thin-walled cylinder A1 and a thin-walled cylinder B2, and a thin-walled web A3 and a thin-walled web B6. The size d1 of the thin-walled cylinder A1 remains the same as the original flexible gear, while the size d2 of the thin-walled cylinder B2 is larger than the original flexible gear. The thin-walled cylinder A1 and the thin-walled cylinder B2 are connected by the thin-walled web A3 to form an integrated thin-walled cylinder. The opening end of the thin-walled cylinder A1 is an input end, and the inner hole of the input end is a wave generator mounting hole 4. The outer circle of the wave generator mounting hole 4 is provided with a transmission gear 5. The opening end of the thin-walled cylinder B2 is an output end, and the output end is provided with an output connecting flange 7. The output connecting flange 7 is radially connected to the thin-walled cup B2 through the thin-walled web B6 and extends radially outward. The diameter d1 of the thin-walled cylinder A1 and the diameter d2 of the thin-walled cylinder B2 have a relationship of d2=(1.24-1.36)d1. The opening size d of the output end of the thin-walled cylinder B2 and the diameter d1 of the thin-walled cylinder A1 have a relationship of d=(1.42-1.48)d1. The diameter D of the output connecting flange 7 and the diameter d1 of the thin-walled cylinder A1 have a relationship of D=(1.68-1.76)d1. The axial size L1 of the thin-walled cylinder A1 and the axial size L of the flexible gear have a relationship of L1=(0.52-0.64)L. The axial size L2 of the thin-walled cylinder B2 and the axial size L of the flexible gear have a relationship of L2=(0.18-0.27)L. After the structure is improved, the stress condition of the hat-shaped flexible gear changes. According to the flexible gear thin shell theory and finite element simulation analysis and calculation, under the condition that the gear parameters and the axial size L of the flexible gear are the same, the carrying capacity of the utility model is increased by 32-48% or even more than that of the original flexible gear, and the service life of the flexible gear is improved.

Claims

1. A high load capacity top hat shaped flexspline structure, characterized by: The thin-walled cylinder A (1) and the thin-walled cylinder B (2) are radially connected through the thin-walled web A (3); the opening end of the thin-walled cylinder A (1) is the input end, the inner hole of the input end is the wave generator mounting hole (4), the outer circle of the wave generator mounting hole (4) is provided with the transmission gear (5); the opening end of the thin-walled cylinder B (2) is the output end, the output end is provided with the output connecting flange (7), the output connecting flange (7) is radially connected with the thin-walled cylinder B (2) through the thin-walled web B (6) and extends radially outward.

2. A high load carrying capacity top hat shaped flexspline structure according to claim 1, characterized in that: The diameter d1 of the thin-walled cylinder A (1) and the diameter d2 of the thin-walled cylinder B (2) have the relationship d2=(1.24-1.36)d1.

3. A high load carrying capacity top hat shaped flexspline structure according to claim 1, characterized in that: The opening size d of the output end of the thin-walled cylinder B (2) and the diameter d1 of the thin-walled cylinder A (1) have the relationship d=(1.42-1.48)d1.

4. A high load carrying capacity top hat shaped flexspline structure according to claim 1 characterized by: The diameter D of the output connecting flange (7) and the diameter d1 of the thin-walled cylinder A (1) have the relationship D=(1.68-1.76)d1.

5. A high load carrying capacity top hat shaped flexspline structure according to claim 1 characterized by: The axial size L1 of the thin-walled cylinder A (1) and the axial size L of the flexible gear have the relationship L1=(0.52-0.64)L.

6. A high load carrying capacity top hat shaped flexspline structure according to claim 1 characterized by: The axial size L2 of the thin-walled cylinder B (2) and the axial size L of the flexible gear have the relationship L2=(0.18-0.27)L.

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