A design method of concave-convex tooth thread coupling

Abstract

The invention discloses a design method of a concave-convex tooth line coupling, which comprises the following steps that the normal section center of a rack cutter moves along three parabola sectionsto make a displacement curve to form an imaginary shaped rack, and the tooth surface equation of a convex outer tooth is derived; the tooth surface equation of the concave-convex tooth line couplingis obtained; the inner tooth is machined with standard involute gear shaper cutter or disc wheel; the cutter is fed along the axial direction, and a radial movement is added. The concave-middle machining of the inner tooth is realized by controlling the radial feed, and the tooth surface equation of the concave-middle inner tooth is deduced. The contact analysis model and finite element analysis model of gear tooth edge considering the installation error of shaft angle are established. The maximum shaft angle, the maximum bending stress of tooth root and the maximum contact stress of tooth surface of drum gear coupling and concave-convex gear coupling are compared respectively. The design method ensures that the concave-convex tooth thread coupling has small tooth surface contact stress and tooth root bending stress, and improves the gear tooth strength. At the same time, the angle of shaft intersection can be increased, and the error sensitivity of the concave-convex gear coupling canbe improved.

Description

technical field [0001] The invention belongs to the technical field of gear transmission, and in particular relates to a design method of a concave-convex tooth line coupling. Background technique [0002] The drum gear coupling is an indispensable core basic part of the mechanical power device. It is composed of the outer teeth of the tooth-shaped drum and the inner teeth of the same number of teeth. It has the advantages of compact structure, large bearing capacity, wide transmission torque range and high transmission efficiency It has the advantages of high height and convenient assembly and disassembly, and can compensate the radial, axial, angular and comprehensive displacement between two shafts. It has been widely used in the fields of shipbuilding, metallurgy, aviation, rail transportation, etc. Our country only began to conduct systematic research on drum gear couplings in the mid-1960s. Limited by many technical conditions, although the research results are remarka...

AI Technical Summary

Problems solved by technology

Some scholars even imagine that the internal teeth are designed as a convex tooth shape. Theoretically, the convex-convex meshing drum-shaped tooth coupling can increase the variation range of the shaft angle, but the area of ​​the contact area is reduced, and the contact stress on the tooth surface will inevitably be greatly increased. , is obviously unreasonable

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