Processing method of tooth thickness-variable gear with intersecting axles and hob of tooth thickness-variable gear

Abstract

The invention relates to the field of mechanical processing and manufacturing, in particular to a processing method of a tooth thickness-variable gear with intersecting axles and a hob of the tooth thickness-variable gear, and aims to improve the asymmetry of tooth forms of the left side and the right side of a processed tooth thickness-variable gear. Each cutting blade of the hob comprises a first straight line, a first circular arc, a second straight line, a second circular arc and a third straight line which are tangent to one another; the pressure angles of the cutting blades on the left side and the right side are not equal; the included angle between the first straight line and the second straight line of the hob is 110.1624 degrees; the included angle between the second straight line and the third straight line is 109.8427 degrees; the radius of the first circular arc is 2.28 mm, and the radius of the second circular arc is 2.28 mm as well; a chip flute is a straight flute parallel to the axle line of the hob; the processed tooth thickness-variable gear has a large-end modulus of 6 mm, a tooth number of 21, a helical angle of 11 degrees and a crossed axis angle of 2.18 degrees; and the two gears have same size and reversal rotation directions. The invention further discloses a method for processing the tooth thickness-variable gear. The asymmetry of tooth forms of the tooth thickness-variable gear can be greatly improved by using the method and the hob provided by the invention.

Description

technical field [0001] The invention relates to the field of mechanical processing and manufacturing, in particular to a processing method and a hob for a gear with intersecting axes and variable tooth thickness. technical background [0002] According to the national standard, the normal pressure angles on the left and right sides of the standard gear hob are equal to 20 degrees. The case where the side helix angles are not equal. If intersecting shaft meshing is carried out, there is an inherent error in the meshing principle, and the stability is not good and the noise is large when the gear rotates at a high speed. The advantage of this method is that standard cutting tools are used, but the left and right tooth profiles of variable tooth thickness gears are asymmetrical. Contents of the invention [0003] In order to overcome the asymmetry of left and right side tooth profiles of variable-tooth-thickness gears manufactured by the above-mentioned prior art, the prese...

AI Technical Summary

Problems solved by technology

[0002] According to the national standard, the normal pressure angles on the left and right sides of the standard gear hob are equal to 20 degrees. The case of unequal side helix angles

If intersecting shaft meshing is implemented, there is an inherent meshing principle error, and the stability is not good when the gear rotates at a high speed, and the noise is large

The advantage of this method is to use standard cutting tools, but the left and right tooth profiles of variable tooth thickness gears are not symmetrical.

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