Planet cone gear type continuously variable transmission

Abstract

The invention discloses a planet cone gear type continuously variable transmission, which comprises a shell, a central gear, an inner gear ring, a planet gear, a planet carrier, an output shaft, a second transmission bevel wheel, a first transmission bevel wheel and an input shaft, wherein the shell is a supporting body; the input shaft and the shell form a revolute pair and drive the first transmission bevel wheel to rotate; the first transmission bevel wheel drives the second transmission bevel wheel to rotate through a transmission device composed of a sliding frame, a first holding rod, a driven wheel, a driven gear, a second holding rod, a transmission gear, a driving wheel, a driving gear and a holding piece; the second transmission bevel wheel drives a worm gear, a center shaft and a sun gear to rotate through a worm; the sun gear drives the output shaft to rotate through three planetary gears; an air cylinder is used for controlling on-off of transmission between the first transmission bevel wheel and the second transmission bevel wheel; and a motor changes the position of the sliding frame by rotating a threaded rod, so that the transmission ratio between the first transmission bevel wheel and the second transmission bevel wheel is changed, and stepless speed change between the input shaft and the output shaft is realized.

Description

technical field [0001] The invention relates to the field of transmissions, in particular to a planetary bevel wheel type continuously variable automatic transmission. Background technique [0002] The mechanical continuously variable transmission has many advantages such as simple structure, high reliability, and convenient stepless speed regulation. At present, there are many applications such as the cone wheel type and the belt type; among them, the belt-driven continuously variable ﹑The driven gear and the metal belt realize the stepless change of the speed ratio, the transmission efficiency is high, and the transmission range is wide, so that the best match between the transmission system and the engine working condition can be obtained, and the fuel economy of the whole vehicle can be improved; in the recent For more than ten years, CVT (Continuously Variable Transmission) technology has made great progress and is widely used in the field of low-power vehicles. However...

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Problems solved by technology

[0002] The mechanical continuously variable transmission has many advantages such as simple structure, high reliability, and convenient stepless speed regulation. At present, there are many applications such as the cone wheel type and the belt type; among them, the belt-driven continuously variable ﹑The driven gear and the metal belt realize the stepless change of the speed ratio, the transmission efficiency is high, and the transmission range is wide, so that the best match between the transmission system and the engine working condition can be obtained, and the fuel economy of the whole vehicle can be improved; in the recent For more than ten years, CVT (Continuously Variable Transmission) technology has made great progress and is widely used in the field of low-power vehicles. However, it is limited by the material and technology of the metal belt, making the manufacturing cost very high, and Most of its core technologies and patents are in the hands of foreign companies, and China's national enterprises are at an obvious disadvantage in the development of belt-driven continuously variable transmissions; It is driven by friction and lubricating oil film traction, and can be continuously variable by changing the working radius of the contact point. It has the advantages of stable transmission, low noise, simple structure, overload protection effect, and various forms; the developed function is reasonable and stable. Reliable bevel wheel type continuously variable transmission has significant economic benefits and social significance

[0003] The Chinese invention patent with the publication number CN106090161A has announced a servo cone wheel type continuously variable transmission with a small friction wheel that can move linearly in the middle. By changing the position of the small friction wheel, the distance between the input cone wheel and the output cone wheel can be changed. Transmission ratio, so as to realize stepless speed change; Since the transmission between the small friction wheel, the input cone wheel and the output cone wheel is carried out by friction force, the small friction wheel must be in contact with the contact generatrix of the input cone wheel and the output cone wheel during the speed change process Sliding friction will easily damage the contact surface between the small friction wheel and the input cone wheel and output cone wheel, which will seriously shorten the service life of the transmission, and the sliding friction will also generate more heat, waste more fuel, and increase air pollution. It also reduces the transmission efficiency of the transmission

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