Continuously variable transmission of snowmobile

Abstract

The invention discloses a continuously variable transmission (CVT) of a snowmobile. The CVT comprises a driving wheel, a driven wheel and a transmission belt which is used for connecting the driving wheel with the driven wheel. The driving wheel is provided with a fixed disc with a conical surface, a movable disc and a central shaft. The CVT is characterized in that the central shaft arranged between the fixed disc and the movable disc is sheathed with a rolling bearing; the periphery of the movable disc is uniformly provided with 2-4 idler wheels; two sides of each idler wheel are symmetrically provided with counterweight arms; one end of the central shaft, far away from the fixed disc, is fixed with a cover; the idler wheels on the movable disc always prop against the internal surface of the cover under the action of a compressive spring; and positions on the internal surface of the cover, corresponding to the idler wheels, are provided with idler wheel slideways. The CVT has simplestructure and low manufacture cost, can play a function of turning off the power and replacing a clutch when the transmission belt falls on the ball bearing, has greater centrifugal force at a certain rotation speed, and leads the driving wheel to quickly and forcibly push the fixed disc, thus reliably and effectively changing the groove size of the driving wheel and the driven wheel automatically, and realizing speed change.

Description

technical field [0001] This invention relates to speed change mechanisms, and more particularly, to continuously variable transmissions for snowmobiles. Background technique [0002] The continuously variable transmission system is driven by two transmission wheels whose diameter can be changed, and a transmission belt set on the two transmission wheels. Small scooters generally use a continuously variable transmission device, which relies on the driving wheel to generate centrifugal force through the centrifugal roller, forcing the driven wheel to overcome the spring resistance in the driven wheel, so that the driven wheel becomes smaller and the driving wheel becomes larger, thereby realizing speed change. The continuously variable transmission driving wheel of a motorcycle includes a fixed disc with a tapered surface and a moving disc. The fixed disc is fixed at one end of the central shaft, and the moving disc is slipped on the central shaft. The end of the moving disc c...

AI Technical Summary

Problems solved by technology

Since the large-displacement snowmobile has to bear heavy load, high speed, and long-term operation (transportation, patrol), if the structure of the motorcycle continuously variable transmission is adopted, the centrifugal force of the driving wheel roller is small, and the thrust on the moving plate Small, can not produce reliable and stable thrust to the moving plate, effectively adjust the distance between the moving plate and the fixed plate, especially when starting and driving at low speed, the centrifugal force of the roller is smaller, the torque cannot be effectively transmitted, and the transmission efficiency is low; but , if the hydraulic mechanism used in automobiles is used to apply axial hydraulic pressure to the driving and driven wheels to push the moving plate, the structure is complicated and the cost is too high

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