ARC-SHAPED SURFACE CONTACT-BASED WORM AND WORM GEAR TRANSMISSION TYPE POWER DEVICE

摘要

An arc-shaped surface contact-based worm and worm gear transmission type power device, relating to the field of speed reducers for escalators. In arc-shaped surface contact-based worm and worm gear transmission, the worm is a multi-head arc-shaped cylindrical worm; a worm and worm gear optimized mathematical model is established based on an evolutionary fish swarm algorithm to optimize parameters of a worm pair, so as to obtain engagement performance of tooth surfaces; the tooth surface curvature of the worm is corrected on the basis of grinding machining, so that the tooth surfaces are engaged to form an arc-shaped surface contact, and the line of instantaneous contact between the worm gear and the worm is changed gradually and stably and distributed uniformly; the line of instantaneous contact between the tooth surfaces is perpendicular to the direction of relative movement direction between the tooth surfaces of the worm gear and the worm. According to the apparatus, after the design of the worm gear and the worm engaged with each other is optimized, the tooth surface curvature of the worm is corrected, so that the tooth surfaces are engaged to form an arc-shaped surface contact, and mounting errors are eliminated; moreover, the normal direction of the tooth surface of the worm pair is perpendicular to the direction of relative movement between the tooth surfaces of the worm gear and the worm, so that good lubricity is achieved for the worm gear and the worm engaged with each other.