Design for three-circular-arc tooth profiles of continuous conjugate cup-shaped or silk-hat-shaped harmonic gear
A harmonic gear and three-arc technology, applied to components with teeth, belts/chains/gears, mechanical equipment, etc., can solve the problem that the involute tooth profile is not the best tooth profile for harmonic gear transmission, etc. Achieve the effect of improving bearing capacity and transmission accuracy, uniform distribution, and improving meshing performance
Active Publication Date: 2017-09-22
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology
[0004] Since the advent of harmonic gears, the involute tooth profile has been widely used due to its ease of processing in technology, but the involute tooth profile is not the best tooth profile for harmonic gear transmission
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[0026] Further describe the present invention below in conjunction with embodiment and accompanying drawing thereof:
[0027] The present invention has a cup-shaped harmonic gear with three arc tooth profiles (see attached figure 1 , 2 ), consisting of rigid wheel 1, flexible wheel 2, wave generator 3 and flexible bearing 4. The wave generator 3 is equipped with a flexible bearing 4; after the wave generator 3 is installed in the flexspline 2, the cross section of the flexspline becomes elliptical, and the teeth of the flexspline 2 and rigid spline 1 are completely meshed in the long axis area. Complete detachment of the minor axis region; figure 2 Projection from the end shows fully engaged - fully disengaged meshing state.
[0028] The present invention has the tooth profile design method (tooth profile design method for short) of three-arc tooth profile harmonic gear, the three-arc tooth profile (refer to image 3 ), which consists of the upper arc segment AB on the to...
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The invention provides a cup-shaped or silk-hat-shaped harmonic gear with three-circular-arc tooth profiles in consideration of the axial taper deformation of a flexible gear body. The cup-shaped or silk-hat-shaped harmonic gear is composed of a rigid gear body, the flexible gear body and a wave generator; the flexible gear body is a straight-tooth cylindrical external gear body with the three-circular-arc tooth profile; and the rigid gear body is a straight-tooth cylindrical inner gear body with the three-circular-arc tooth profile. The invention further provides a design method for the tooth profiles of the cup-shaped or silk-hat-shaped harmonic gear with the three-circular-arc tooth profiles. According to the design method, parameters of the three-circular-arc tooth profile of the flexible gear body are selected according to the design criterion that the envelope existence interval is the largest on a design section; the circular-arc tooth profiles of a tooth root and a tooth top of the rigid gear body adopt outer envelope fitting calculation of the movement tracks of the tooth profile of the flexible gear body on the front cross section and the rear cross section of a gear ring of the flexible gear body; and a middle section adopts circular-arc fitting so as to improve the fitting flexibility of the tooth profiles. Compared with a harmonic gear with double-circular-arc tooth profiles, the harmonic gear with the three-circular-arc tooth profiles has a wider envelope existence interval, a wider conjugate meshing tooth surface and a more uniform backlash, and therefore the bearing capacity and the transmission precision of the harmonic gear can be improved.
Description
technical field [0001] The invention belongs to the technical field of gear transmission, and in particular designs a cup-shaped or hat-shaped three-arc tooth profile harmonic gear with continuous conjugate meshing and a tooth profile design method thereof. Background technique [0002] Harmonic gear transmission is a transmission technology developed on the basis of the theory of elastic deformation of thin shells in the 1950s. Harmonic gears are widely used in many fields such as robotics, instrumentation, aerospace and satellite communications due to their advantages such as large transmission ratio, small size, light weight, high carrying capacity, and high transmission precision. Harmonic gears usually consist of rigid splines, flexsplines, wave generators and flexible bearings. [0003] At present, the common flexspline structures in harmonic gear transmission are: cup-shaped (cup-shaped), silk-hat-shaped (silk-hat-shaped), and circular ring, among which the cup-shape...
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IPC IPC(8): F16H49/00F16H55/08
CPCF16H49/001F16H55/0826F16H55/0833F16H2057/0087Y02T90/00
Inventor 陈晓霞邢静忠
Owner TIANJIN POLYTECHNIC UNIV
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