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Design method of large axial modification amount gear and large axial modification amount gear

A design method and technology of modification amount, applied in the direction of components with teeth, belt/chain/gear, mechanical equipment, etc., can solve the problem of reducing the strength and life of the gear, increasing the grinding amount of the tooth surface, reducing the hardness of the tooth surface, etc. To avoid the reduction of tooth surface hardness and reduce the amount of tooth grinding modification

Active Publication Date: 2015-04-29
CRRC QISHUYAN INSTITUTE CO LTD
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Problems solved by technology

[0002] The traction gears of railway locomotives and engineering machinery often use active gears for cantilever-mounted meshing transmission. This structure is simple and reliable. It is bound to increase the amount of gear modification
The traditional design and processing method is to first design the basic tooth surface with constant displacement coefficient and common normal line, and then carry out the design of the tooth profile modification. The basic tooth surface is realized by hobbing during processing, and the tooth profile modification is realized by grinding after heat treatment. The excessive amount of modification increases the grinding amount of the tooth surface, and the negative impact is that the hardness of the tooth surface is reduced, and the depth of the grinding boss and the tooth surface is not enough. These are recognized in the industry to reduce the strength and life of the gear. the main risk factors

Method used

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  • Design method of large axial modification amount gear and large axial modification amount gear
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  • Design method of large axial modification amount gear and large axial modification amount gear

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Embodiment Construction

[0037] Such as figure 1 , 2 , 3, 4, 5, and 6, the design method of a large tooth direction modification amount gear of the present invention includes:

[0038] (a) Set the design parameters of the basic gear model 1: the number of teeth z 1 , modulus m 1 , tooth width b 1 , pressure angle α 1 , Variation coefficient x 1 ; The method also includes:

[0039] (b) Determine the tooth surface of the basic gear model 1 based on the set design parameters of the basic gear model 1. The intersection line of the indexing circular cylindrical surface and the right tooth surface of gear model 1 is marked as profile line BG, and the common normal of the basic gear model 1 is W 1 ;W 1 Calculate according to the following formulas I and II:

[0040] W 1 = m 1 cosα 1 ·[π(k 1 -0.5)+z 1 ·invα 1 ]+2x 1 m 1 sinα 1 (I),

[0041]

[0042] In formula II, k 1 Values ​​are rounded to integers;

[0043] (c) setting the tooth direction modification amount of the left and right t...

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Abstract

The invention provides a design method of a large axial modification amount gear and the large axial modification amount gear. The design method comprises the steps of determining the design parameters of the large axial modification amount gear according to conditions based on the parameters and the axial modification amount of a set basic gear model, determining the tooth surfaces of the first non-modified gear model and the second non-modified gear model of the large axial modification amount gear before modification, performing axial modification on the tooth surfaces of the first non-modified gear model and the second non-modified gear model, and then obtaining the large axial modification amount gear so that the axial modification amount of one side of the left and right tooth surfaces is 0, while the axial modification amount of the other side is the absolute value of d-c; as a result, a tooth grinding lug boss is avoided, the tooth surface hardness and the depth of a carburized layer are improved, and the reliability of the gear is improved.

Description

technical field [0001] The invention relates to a design method of a gear and the gear thereof, and is especially suitable for a cantilever-mounted hard tooth surface involute cylindrical gear with a large tooth surface meshing misalignment. Background technique [0002] The traction gears of railway locomotives and construction machinery often use active gear cantilever-installed meshing transmissions. This structure is simple and reliable. It is bound to increase the modification amount of the gear. The traditional design and processing method is to first design the basic tooth surface with constant displacement coefficient and common normal, and then carry out the design of the tooth profile modification. The basic tooth surface is realized by hobbing during processing, and the tooth profile modification is realized by grinding after heat treatment. The excessive amount of modification increases the grinding amount of the tooth surface, and the negative impact is that th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H55/17F16H55/08
CPCF16H55/0806F16H55/17
Inventor 颜力刘忠伟文超
Owner CRRC QISHUYAN INSTITUTE CO LTD
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