Design method of side rear angle surface of toroidal worm gear hob

Abstract

The invention discloses a design method of a side rear angle surface of a toroidal worm gear hob, and belongs to the field of mechanical transmission. The design method comprises the following steps: constructing a left side rear angle surface of at least one cutter tooth of the toroidal worm gear hob, and rotating a front cutter surface of the at least one cutter tooth by a first angle theta1 to obtain a mapping front cutter surface; rotating the left side helicoid of the basic toroidal worm by a second angle theta 2 to obtain a left side mapping helicoid; determining a first intersecting line formed by intersecting the mapping rake face and the left side mapping spiral face; obtaining a plurality of first intersecting lines by changing the first angle theta1 and the second angle theta2; and obtaining the left side rear angle surface based on the plurality of first intersecting lines. According to the design method, the side rear angle face design method of the edge-belt-free regrindable ring surface worm gear hob is achieved, it is guaranteed that after the front cutter face of the ring surface worm gear hob is reground, a worm gear tooth face theoretical meshing area obtained through hobbing cutting of a new cutter tooth cutting edge line is kept unchanged, and therefore the regrindability of the ring surface worm gear hob is achieved.

Description

technical field [0001] The invention relates to the field of mechanical transmission, in particular to a design method for a side clearance angle surface of a toroidal worm wheel hob. Background technique [0002] The worm gear in the secondary enveloping toroidal worm pair is hobbed by a toroidal worm gear hob. The structure of the hob affects its cutting performance, service life, worm gear accuracy and transmission performance of the worm pair. Therefore, the rational design and precision manufacturing of the toroidal worm gear hob is the key to obtain a high-performance toroidal worm pair. The toroidal worm gear hob has the characteristics of variable tooth thickness, variable tooth shape and variable helix angle. Moreover, the basic toroidal worm screw surface on which the blade is located is generally an envelope curved surface, which makes the design and manufacture of this type of hob particularly complicated. Contents of the invention [0003] The way of designi...

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Problems solved by technology

[0004] Therefore, the structural form of the toroidal worm gear hob with a margin solves the problems of the correctness of the blade shape of the toroidal worm gear hob, the difficulty in processing the side relief angle, and the service life.

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