Novel CVT gearbox

Abstract

The invention relates to a novel CVT gearbox which comprises a drive wheel movable disc, a drive wheel fixed disc, a driven wheel movable disc, a driven wheel fixed disc and a mute chain. The mute chain comprises a chain plate, bent pin shafts and short pin shafts. A through hole is formed in the chain plate. One set of pin shafts are inserted in each of the two ends in the through hole in a penetrating manner, and each set of pin shafts comprise one bent pin shaft and one short pin shaft, wherein the bent pin shaft is attached to the short pin shaft, and an opposite rolling face is formed by the side faces of the attached sides. The inclination angle of the arc face of the bent end of each bent pin shaft ranges from 17 degrees to 23 degrees, the inclination angle of the arc face of the straight end of each bent pin shaft ranges from 1 degree to 3 degrees, the curvature radius of the arc face of the bent end of each bent pin shaft ranges from 100 mm to 170 mm, and the curvature radius of the arc face of the straight end of each bent pin shaft ranges from 150 mm to 200 mm. The mute chain is provided with the two kinds of pin shafts, the arc faces of the two kinds of pin shafts conduct the pure rolling movement in the transmission process, the function of pitch changing is achieved, the vibration and noise of the chain are lowered, and the chain transmission efficiency is improved.

Description

technical field [0001] The invention belongs to the field of gearboxes, in particular to a novel CVT gearbox. Background technique [0002] For a long time, the key components of known CVT transmissions are chains or steel belts, and the end surfaces on both sides of the chains and steel belts are symmetrical relative to the center. The chain is composed of one or more chain plates, and its pitch is one or two pitches, and the length of the chain is arranged in an orderly manner to match the transmission ratio and center distance of the gearbox. The pin shaft is a non-circular intended pin shaft, which is positioned on the side of the positioning hole of the chain plate. There are four pin shafts in each chain plate hole, and a pair of two pins form a hinge pair where the two pin shafts roll against each other, so as to achieve durability. Grinding and noise effects. The two ends of the pin shaft are symmetrical arc surfaces, and the arc surfaces are frictionally transmitt...

AI Technical Summary

Problems solved by technology

The end faces on both sides of the pin shaft are symmetrical, so that when the transmission ratio of the continuously variable transmission changes, the deflection of the chain increases, which increases the wear between the chain hinge pairs and reduces the transmission efficiency of the transmission.

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