Stepless speed change device

Abstract

The invention relates to a stepless speed change device which comprises an input shaft, an input spiral gear, an output shaft and an output spiral gear. The input spiral gear comprises an input cone and input teeth, and the input cone and the input teeth are rotationally connected. The input teeth are spirally arranged by multiple circles on the outer circumferential surface of the input cone along the axis of the input cone. The thread pitches of the input teeth are the same, and the tooth numbers of multiple circles of the input teeth are integrally multiplied according to equal proportion. The output spiral gear comprises an output cone and output teeth. The output cone can slide along the output shaft and transmits torque to the output shaft. The output teeth are spirally arranged by at least one circle on the outer circumferential surface of the output cone along the axis of the output cone. The spiral direction of the output teeth is opposite to that of the input teeth. The thread pitch of each circle of the output teeth is the same as that of each circle of the input teeth. The input spiral gear is meshed with the output spiral gear. Output torque of the stepless speed change device is considerably larger than that of a steel-belt stepless speed change device, so that the stepless speed change device can be applied to large-displacement off-road vehicles and heavy trucks.

Description

technical field [0001] The present invention relates to the field of transmission devices, in particular, to continuously variable transmission devices. Background technique [0002] Gearbox is an important core component of a car. From the perspective of development trend, automatic continuously variable transmission is the ultimate goal. Judging from the gearboxes commonly used today, the structure of manual gearboxes and automatic gearboxes is complex. After the shifting gears are increased to 7 gears, there are more than 500 parts in the gearbox, which is difficult to compare in terms of technology and cost. Room to add upwards. The most mature belt-type continuously variable transmission (CVT) uses friction transmission instead of gear meshing. Limited by the strength and friction resistance of the steel belt material, the torque of 300 Nm is almost the limit. In large-displacement off-road vehicles and heavy-duty Not applicable on trucks. [0003] In view of this, t...

AI Technical Summary

Problems solved by technology

Judging from the gearboxes commonly used today, the structure of manual gearboxes and automatic gearboxes is complex. After the shifting gears are increased to 7 gears, there are more than 500 parts in the gearbox, which is difficult to compare in terms of technology and cost. room to increase

The most mature steel belt continuously variable transmission (CVT) uses friction transmission instead of gear meshing. Limited by the strength and friction resistance of the steel belt material, the torque reaches 300 Nm, which is almost the limit. Not applicable on trucks

[0003] In view of this, there is currently no transmission device with a simple and reliable structure that can output high torque and realize continuously variable transmission.

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