Point contact shape correcting method of Niemain worm gear

A technology of point contact and worm gear, which is applied to components with teeth, belts/chains/gears, hoisting devices, etc., can solve problems such as unintuitive effect of shape modification, difficult shape modification, and complicated Niemann worm drive. Achieve the effect of increasing service life, improving transmission accuracy, improving sensitivity and tooth surface contact stress concentration

Active Publication Date: 2017-10-20
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the complexity of the Niemann worm drive, it is difficult to modify it
In the traditional hobbing process, the worm gear is indirectly modified by the repair hob, the effect of the modification is not intuitive, and sometimes it needs to be adjusted repeatedly

Method used

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  • Point contact shape correcting method of Niemain worm gear
  • Point contact shape correcting method of Niemain worm gear
  • Point contact shape correcting method of Niemain worm gear

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Embodiment Construction

[0060] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0061] Such as figure 1 As shown, the present invention adopts UG software to model and modify the shape of the Niemann worm gear, comprising the following steps:

[0062] S1, such as figure 2 As shown, the original accurate model of the unmodified Niemann worm gear was established in the 3D software. The main parameters of the worm pair are as follows:

[0063] The axial modulus of the worm m=10.5mm, the number of worm heads Z 1 =4, the number of worm gear teeth Z 2 =37, worm normal tooth profile angle α n =23°, coefficient of worm addendum height Worm dedendum height factor The lead angle of the helix on the worm indexing cylinder γ=23.8505556°, the radius of the grinding wheel r u =...

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Abstract

The invention discloses a point contact shape correcting method of a Niemain worm gear. The method includes the steps that S1, an original precise model is established; S2, coordinates of a central point of an exit region and the normal vector of the tooth surface of the point are acquired; S3, a tangent plane of the tooth surface of the worm gear is established by passing the central point of the exit region, and a coordinate system is established on the plane; S4, points on the tooth surface of the worm gear are projected on the tangent plane; S5, projection point coordinates are substituted into a shape correcting amount equation to obtain the shape correcting amount of projected points; S6, the points on the tooth surface of the worm gear deviate into gear teeth along the normal vectors of the tooth surfaces of the points; S7, the deviating points are fit into a smooth surface, namely a shape-corrected tooth surface in a high order mode; S8, the shape-corrected tooth surface and the original tooth surface are subjected to deviation comparison in three-dimensional software, if spots meet requirements, the operation is completed, or else, shape correcting amount equation coefficients in S5 are adjusted, and S5 to S8 are repeated. The method has the advantages that the sensitivity of the tooth surface of the Niemain worm gear to errors and tooth surface contact stress concentration are effectively improved, drive precision is improved, and the vibration and noise level of engagement is reduced.

Description

technical field [0001] The invention relates to a point contact modification method of a Niemann worm gear. Background technique [0002] Worm gear transmission is a type of transmission characterized by compact size and large speed ratio. One stage can replace multi-stage cylindrical gear transmission, and it can be arranged in a small space. It is widely used in modern industry. Worm gear transmission includes three categories: cylindrical worm transmission, toroidal worm transmission and conical worm transmission. The former includes Archimedes cylindrical worm transmission (ZA), normal straight profile cylindrical worm transmission (ZN), involute cylindrical worm Transmission (ZI), cone enveloping cylindrical worm drive (ZK) and arc cylindrical worm drive (ZC). [0003] ZC 1 The type worm drive was invented by Professor Niemann of Germany (also known as the Niemann worm drive). It is a double-enveloping cylindrical worm drive: the tooth surface of the worm is enveloped...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H55/22F16H55/08
CPCF16H55/088F16H55/22
Inventor 吴海兵许兆美孙全平陈前亮
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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