Stepless speed-changing device

Abstract

The invention relates to a stepless speed-changing device, comprising an input cone pulley, an output cone pulley and a transmission chain of the input cone pulley and the output cone pulley, wherein the axis of the input cone pulley is parallel to that of the output cone pulley, and the orientation of the cone surface of the input cone pulley is opposite to that of the cone surface of the output cone pulley. The stepless speed-changing device is characterized in that a contact transmission unit on the transmission chain has a rotating freedom degree on the plane which is vertical to the self center point and surrounds the moving direction of the input cone pulley and the outer cone pulley, and can adapt to the change of the orientation of the conical surfaces so as to adjust the inclined direction automatically. The selection of the manufacturing materials of the contact transmission unit and the cone pulleys and the conical-degree sizes of the cone pulleys meet the self-locking condition for generating friction; and the static friction coefficient among the contact transmission unit and the cone pulleys is larger than the tangential value of the conical degree of the cone surface. The peripheries of the input cone pulley and the output cone pulley are provided with sliding grooves along the bus direction, and variable-diameter sliding blocks slide along the sliding grooves to change the working diameter, so that the stepless speed-changing transmission is realized.

Description

technical field [0001] The invention provides a continuously variable transmission related to the fields of automobiles and machinery. Background technique [0002] There are many types of continuously variable transmission mechanisms, and the cone-wheel friction drive is the most commonly used structural form. Among them, the "long cone-shifting belt" continuously variable transmission uses a transmission belt and two cone wheels with parallel axes and opposite cone surfaces to realize infinitely variable transmission. The step-variable transmission has obvious advantages such as simple structure, constant power, symmetrical speed change, etc., but the transmission belt is twisted due to the change of the direction of the cone surface, so only a long cone with a very gentle taper can be used to reduce the degree of twisting, and the size and weight of the device are relatively large. Use occasions are limited. The "cone wheel and steel belt" continuously variable transmiss...

AI Technical Summary

Problems solved by technology

[0002] There are many types of continuously variable transmission mechanisms, and the cone-wheel friction drive is the most commonly used structural form. Among them, the "long cone-shifting belt" continuously variable transmission uses a transmission belt and two cone wheels with parallel axes and opposite cone surfaces to realize infinitely variable transmission. The step-variable transmission has obvious advantages such as simple structure, constant power, symmetrical speed change, etc., but the transmission belt is twisted due to the change of the direction of the cone surface, so only a long cone with a very gentle taper can be used to reduce the degree of twisting, and the size and weight of the device are relatively large. The use case is limited

The "cone wheel and steel belt" continuously variable transmission uses four conical wheels to form two "V"-shaped reducing wheels. The taper of the wheel is large, so the volume is small, and there is no problem of twisting the transmission belt to adapt to the change of the orientation of the cone surface, but the number of cone wheels is doubled, and the structure is more complicated. In addition, the transmission belt needs to bear a large axial clamping force , high performance and manufacturing process requirements, increased manufacturing costs and energy consumption

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