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Involute gear hob of asymmetric tooth profile with equal modulus

A technology of involute gears and asymmetric teeth, which is applied in gear tooth manufacturing tools, gear tooth manufacturing devices, belts/chains/gears, etc.

Inactive Publication Date: 2007-07-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an equal modulus asymmetric tooth profile involute gear hob, which solves the problem of processing and manufacturing double pressure angle asymmetric gears

Method used

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  • Involute gear hob of asymmetric tooth profile with equal modulus
  • Involute gear hob of asymmetric tooth profile with equal modulus
  • Involute gear hob of asymmetric tooth profile with equal modulus

Examples

Experimental program
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Effect test

Embodiment Construction

[0038] In Figure 1, firstly, according to the parameters of the processed asymmetric gear, the basic size and normal tooth profile size of the hob are obtained, and then the axial tooth profile size t is calculated z , t z = t n / cosλ fg =10.210 / cos2.78°=10.222, sub-circle helix angle λ f ,λ f = sin -1 (nm n / d fg ) = sin -1 (1*3.25 / 66.85)=2.78°, where, d fg - Divide the circle diameter for the hob. Thus the axial dimension of the hob can be determined.

[0039] In Fig. 2, the first shovel amount K, K=πD eg tgα e / Z g =(3.14*75 / 10)tg(10°~12°)=4.15~5.01, take K=5; second shovel back quantity K 1 , K 1 =1.5K=1.5*5=7.5; take the flute angle θ=25°; chip flute depth H, H=h g +(K+K 1 ) / 2+1=7.6375+12.5 / 2+1=14.8875, take H=14.9; other pillow block or keyway size can be selected according to the modulus.

[0040] In Figure 3, from the previous formulas (5), (6), (7), (8): α qz =34.45°, α qy =20.19°, h eg = 3.61, h egq =7.72. S fzg = S fng / cosλ fg =5.1 / cos2.78°...

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Abstract

A hobbing cutter for manufacturing the isomodulus asymmetric involute gear has a cutting part formed by a segment of Archimedes' worm. The lateral cutting edge of its cutting tooth is on the spiral surface of said worm. The two cutting edges are the intersecting line between the surface of chip flute and lateral relief surface. A positive lead angle and reasonable back-off angles of top and lateral cutting edges are used. Its installation angle is the spiral lead angle.

Description

technical field [0001] The invention belongs to the technical field of gear hobs, and in particular provides an equal-modulus asymmetrical tooth profile involute gear hob. Background technique [0002] Gear transmission is widely used in various sectors of industry, agriculture, national defense, science and technology, and national economy, especially in mechanical transmission devices, whose performance and quality directly affect the technical and economic indicators of the complete machine product. The shape of the gear tooth is very important to the performance of the gear transmission. Since the double pressure angle asymmetric tooth profile involute cylindrical gear uses a large pressure angle on the working tooth side and a small pressure angle on the non-working tooth side, this can not only improve the bending strength of the gear , the contact strength of the tooth surface, but also increases the comprehensive curvature radius of the working tooth side, and then i...

Claims

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Application Information

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IPC IPC(8): B23F21/16
Inventor 李威刘延军
Owner UNIV OF SCI & TECH BEIJING
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