Pin hole output adjustable backlash planetary gear with less tooth difference

Abstract

The invention discloses a small tooth difference planetary transmission device adopting pin hole output and provided with adjustable clearance. Small tooth difference planetary transmission includes hypocycloid pin wheel planetary transmission, cycloid pin wheel planetary transmission and involute small tooth difference planetary gear transmission. The adoption of the pin hole type output refers to that power transmission pins mounted on planet wheels are inserted into holes corresponding to power transmission discs on power transmission rods of output shafts, and then angular velocities of the planet wheels are output in a constant speed ratio. During precision transmission, phase positions of center wheels of two meshed pairs with 180-degree phase difference or phase positions of the power transmission pins on the planet wheels are relatively rotated for a small angle; and when two groups of phase differences of the meshed pair are symmetric, a group of center wheels relative to another group of center wheels are rotated for a small angle so as to reduce or eliminate transmission clearance. The transmission device can increase bearing capacity greatly, reduce the size and weight and improve impact resistance and transmission efficiency, and can be used for various types of transmission such as high speed, heavy load, high power, high accuracy, small return difference and the like.

Description

technical field [0001] The invention relates to the field of mechanical planetary transmission Background technique [0002] At present, the involute small tooth difference planetary gear transmission and the cycloidal pin wheel planetary transmission in the small tooth difference planetary transmission widely used in the field of mechanical planetary transmission usually adopt the hole pin output mechanism, that is, the mutual position is 180° by the holes on the planetary gears. The angular velocity of the two planetary gears is output through the pins of the output disk on the output shaft with constant speed ratio. It is usually called hole-pin type W mechanism, which has the advantages of simple structure and static balance of the transmission and improved load-carrying capacity. The disadvantage is that the force on the pin is uneven, the planetary wheel far away from the output shaft, the cantilever of the pin is long, the bending moment is large, and the diameter of...

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Problems solved by technology

The problem is that the mechanism described in the patent is single and the structure is relatively complicated. There is no special processing equipment for the hypocycloid wheel at present, and the manufacturing cost is relatively high.

At present, in some special precision transmission devices such as the feed mechanism of precision machine tools and radars, robots, etc., there are more and more demands for high motion accuracy, small gaps, small deformation, and small return errors. The existing transmission devices are far from being able to meet needs

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