Yo-yo variable-pitch eccentric wheel pair

Abstract

A yo-yo variable-pitch eccentric wheel pair comprises an eccentric shaft and an eccentric wheel, and is characterized in that the yo-yo variable-pitch eccentric wheel pair is provided with an eccentric shaft seat; the eccentric shaft seat comprises a disc and a hatchet-shaped boss; the hatchet-shaped boss is arranged on the disc; the section of the hatchet-shaped boss is in the shape of an object similar to a hatchet; an eccentric through hole is formed in the center of the hatchet-shaped boss, corresponds to the disc and sleeves an eccentric shaft in a close fit manner; the rear end surface of the eccentric wheel is provided with a broadax-shaped groove of which the section is in the shape of an object similar to a broadax; a flare angle formed by two side walls of the broadax-shaped groove is greater than a flare angle formed by two obtuse-angle-shaped edges of the hatchet-shaped boss of the eccentric shaft seat; an avoidance through groove is formed in the bottom of the broadax-shaped groove of the eccentric wheel; the broadax-shaped groove in the rear end surface of the eccentric wheel covers the hatchet-shaped boss of the eccentric shaft seat; the eccentric shaft penetrates in the avoidance through groove of the eccentric wheel; when the two obtuse-angle-shaped edges of the hatchet-shaped boss respectively correspond to two transmission workstations of obtuse-angle-shaped walls of the broadax-shaped groove in a gluing manner, the axial lead of the eccentric shaft and the axial lead of the eccentric wheel are not equidistant; when the pitch is changed, the eccentric shaft does not rub with the wall of the avoidance through groove; and the yo-yo variable-pitch eccentric wheel pair is high in transmission moment and free of noise, and the pitch changing times are large.

Description

Technical field: [0001] The invention relates to an eccentric wheel shaft structure, in particular to an eccentric wheel pair with positive and negative transition distances. Background technique: [0002] Chinese patent 201110111903.3 "A dual-purpose car washing and air charging device" discloses a mechanism for switching and pressurizing two media, gas and water, by a cylinder. The pressure area and stroke are the same, but the gas elasticity is large, and the liquid is basically inelastic, so the air pressure is low and the water pressure is high. This difference cannot be eliminated in the same cylinder. To solve this problem, it is necessary to use different cylinders, or different eccentric axles of the same cylinder to switch the clutch through complex mechanical design. However, these two schemes have high equipment cost, complicated structure and enlarged volume. [0003] In order to solve the above problems, Chinese Patent No. 201220413983.8 "A Variable-Pitch Ecc...

AI Technical Summary

Problems solved by technology

[0006] 1. When the eccentric shaft slides in the long sliding groove due to change of direction, it has a large sliding friction force with the long groove wall, resulting in large wear and noise

[0007] 2. The sliding pin is limited by the small diameter of the radial hole of the eccentric shaft, the diameter is smaller than the radius of the eccentric shaft, and the speed is fast when changing direction. When it hits the round wall of the swing space platform, it bears a large impact force and is easy to bend.

At the same time, the sliding pin is in point contact with the round wall of the platform and is easy to deform

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