Rack with tooth trace shape of epicycloid

Abstract

The invention discloses a rack with a tooth trace shape of an epicycloid. Intersection lines of wheel teeth of the rack with a dividing plane, a tooth root plane and a tooth top plane are all prolate epicycloids; intersection lines of wheel teeth of a cylinder gear which is meshed with the rack with a dividing cylinder plane, a tooth root cylinder plane and a tooth top cylinder plane are also prolate epicycloids; in a central section of a tooth width direction, a toothed curve of the rack is a straight line; a toothed curve of the cylinder gear meshed with the rack is an involute; in the central section of the tooth width direction, the meshing of the rack with the matched cylinder gear is equivalent to the meshing of a traditional involute gear with the rack; therefore, the rack has constant transmission rate. In other sections parallel to the central section, the rack mutually corresponds to tooth outlines of the matched cylinder gear in a convex-concave mode; because of small comprehensive curvature and large comprehensive curvature radius among contact planes, the rack has large coincidence degree, stable transmission, high carrying capability and long service life. The rack has the advantages of overcoming the defects of small coincidence degree, large meshing impact and the like of a traditional rack with straight tooth lines, and solving the problem of axial force in the meshing of a rack with oblique tooth lines and the gear. The rack is suitable for high-speed overloaded transmission occasions, can be used as an up-to-date product of a traditional rack with straight teeth and a rack with oblique teeth, and has high popularization value.

Description

technical field [0001] The invention relates to a rack, in particular to a rack whose tooth line is an epicycloid. Background technique [0002] Rack and pinion transmission is a common mechanical transmission component. It mainly converts the rotary motion of the gear into the reciprocating linear motion of the rack through the meshing of the gear teeth, or converts the linear reciprocating motion of the rack into the rotary motion of the gear. Rack and gear transmission has the advantages of simple structure, stable transmission, reliable operation, high efficiency, long life, large transmission power and speed range, etc., so it is widely used in milling machines, drilling machines, lathes, cutting machines, woodworking machines, welding machines, mines It is widely used in industries such as mechanical and automatic rapid displacement mechanism, robot arm grasping mechanism, intelligent three-dimensional warehouse and automobile manufacturing. [0003] The racks current...

AI Technical Summary

Problems solved by technology

However, when the straight toothed rack meshes with the gear, there is an impact, the degree of coincidence is small, and the transmission is not stable enough, which is not suitable for high-speed and heavy-duty transmission; when the helical toothed rack meshes with the gear, the degree of coincidence, transmission stability, vibration and noise are improved Improved, but there is an axial thrust problem

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