Ring surface worm transmission mechanism without side-gap roller enveloping and ring surface worm tooth surface modeling method

Abstract

The invention provides a ring surface worm transmission mechanism without side-gap roller enveloping. The mechanism comprises a roller worm gear and a ring surface worm meshed with the roller worm gear, each gear tooth of the roller worm gear is an independent roller, taking the center of the ring surface worm as a symmetric center, roller tooth surfaces at the center of the ring surface worm arein clearance fit with the tooth surfaces at the two opposite sides of the worm, and the tooth surfaces of the rollers at symmetrical positions in pairs relative to the center of the ring surface wormare in symmetrical interference fit with the single side of the tooth surface on the opposite side of the ring surface worm, and are in symmetrical clearance fit with the single side of the tooth surface on the opposite side of the ring surface worm; and a ring surface worm tooth surface modeling method for the ring surface worm transmission mechanism without side-gap roller enveloping is provided.

Description

technical field [0001] The invention belongs to the technical field of mechanical transmission, and in particular relates to a backlash-free roller-enveloping toroidal worm transmission mechanism and a modeling method for the tooth surface of the toroidal worm. Background technique [0002] Worm drive is a cross-shaft drive, featuring compact structure, stable transmission, reverse self-locking, low noise and small motion error, and is widely used in aerospace, ship navigation, mining metallurgy, rail transportation, national defense weapons and other fields. The current worm drive mainly has the following types: [0003] 1) Double-lead cylindrical worm transmission. Its worm is a cylindrical worm with different moduli on both sides of the tooth surface. The leads of the helical tooth surfaces on both sides are not equal. The thickness varies gradually along its axis; the worm gear is machined by a corresponding composite modulus hob. Adjusting the axial position of the wo...

AI Technical Summary

Problems solved by technology

The main disadvantages of this transmission structure are: a) It is difficult to grind the composite modulus hob for processing the worm gear, and the worm gear cannot be ground, and the precision manufacturing cost is high; b) When the worm gear and worm are meshed and driven, the backlashes of adjacent tooth pairs are not equal, It cannot be guaranteed that the backlash of each pair of teeth meets the accuracy requirements; c) The number of pairs of teeth meshing with the worm gear and the worm at the same time is extremely small, the load-carrying capacity is low, easy to wear, and the precision life is short, which is difficult for high-speed precision motion or heavy-duty precision motion. Require

The disadvantages of this transmission structure are: a) It is difficult for the existing machine tool to complete the high-precision machining of the helical plane worm gear; b) After the worm tooth surface is worn, the axial adjustment of the worm gear cannot be accurately compensated, and it needs to be run-in to achieve the correct meshing relationship

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