Long cone and rolling cone type CVT (continuously variable transmission)

Abstract

The invention discloses a long cone and rolling cone type CVT (continuously variable transmission), which comprises a box body, a first long cone roller wheel, a second long cone roller wheel, at least one pressure device, a first thrust bearing, a second thrust bearing and a middle rolling cone wheel set, wherein the middle rolling cone wheel set comprises a middle rolling cone wheel, a connecting device and an adjusting device; a first conical surface and a second conical surface are arranged on the middle rolling cone wheel; and the first long cone roller wheel and the second long cone roller wheel are connected with the box body through the first thrust bearing and the second thrust bearing respectively. The axial pressing action of the first long cone roller wheel is performed through the pressure device; the contact positions of the middle rolling cone wheel on the two long cone roller wheels are adjusted; and the working radiuses of the two long cone roller wheels can be continuously changed to achieve the effect of CVT. According to the CVT, the geometrical slippage value in the optimal transmission state is 0, the geometrical slippage phenomenon in the cone wheel type long cone and rolling cone type CVT is effectively reduced, the transmission efficiency is improved and the transmission power is increased. The CVT can be used for the fields of various vehicles, ships, mechanical transmission and the like.

Description

technical field [0001] The invention relates to the field of mechanical continuously variable transmissions, in particular to a long cone-roller type continuously variable 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 types of cone wheel, planetary cone wheel, belt, chain, and pulsation. In recent years, the mechanical long-taper-roller-cone continuously variable transmission has received extensive attention and research, but there are few major innovations and breakthroughs in structure. [0003] The belt-driven continuously variable transmission mainly relies on variable-diameter driving and driven wheels and metal belts to achieve stepless change in speed ratio. It has high transmission efficiency and a wide range of speed changes. The best match between the transmission system and the engine ...

AI Technical Summary

Problems solved by technology

In recent years, the mechanical long taper-roller-cone continuously variable transmission has received extensive attention and research, but there are few major innovations and breakthroughs in the structure

[0003] The belt-driven continuously variable transmission mainly relies on variable-diameter driving and driven wheels and metal belts to achieve stepless change in speed ratio. It has high transmission efficiency and a wide range of speed changes. The best match between the transmission system and the engine operating conditions improves the fuel economy of the vehicle; in the last ten years, CVT (Continuously Variable Trans-mission) technology has made great progress and is widely used in In the field of low-power vehicles, however, it is limited by the material and technology of the metal strip, making the manufacturing cost very high

[0004]The bevel wheel type continuously variable transmission is mainly driven by the contact friction and lubricating oil film traction of the main and driven rigid elements (or through the intermediate element), and can be changed by changing its The working radius of the contact point is continuously variable. It has the advantages of stable transmission, low noise, simple structure, overload protection effect, and various forms. At present, there are more cone-disk ring-disk types, multi-disk types, and steel ball-cone types. Wheel type, diamond cone type, planetary cone disc type and planetary ring cone type continuously variable transmission, etc.; in the cone wheel friction type continuously variable transmission, when the cone wheel and the contacted transmission elements are under load and friction work, due to the cone wheel and the contacted transmission element Due to the geometric shape of the contacting transmission elements, the speed distribution in the contact area of ​​the two rolling elements is different, resulting in geometric slippage between the two rolling elements. The geometric slippage in the mechanism will increase the temperature of the traction oil and reduce the traction coefficient, resulting in transmission transmission of the transmission. Power and efficiency decline, etc., and at the same time, it will accelerate the wear of the traction surface and reduce the life of the transmission

[0005] In the prior art, in order to reduce the spin phenomenon of the friction transmission contact area in the bevel wheel type continuously variable transmission, many designers will minimize the contact area between the bevel wheel and the contacted transmission elements according to the size of the transmission power. In order to reduce the geometric slip rate; to minimize the geometric slip rate in the bevel wheel friction continuously variable transmission, only when the contact area between the bevel wheel and the contacted transmission element is a point contact, theoretically it is not Geometric sliding will occur, and the transmission efficiency at this time is also the highest; however, the smaller the contact area between the cone wheel and the contacted transmission element, the worse the load-carrying capacity and the smaller the transmission power; there is a contradiction between the above two phenomenon, how to solve the above technical problems, there is no ideal solution in this field

[0006] In summary, the present invention proposes a novel structure of a mechanical continuously variable transmission, which can reduce the geometric slip rate in the bevel gear transmission mechanism while increasing the contact area between the bevel gear and the contacted transmission element; For example, when the length of the contact transmission area between the cone wheel and the cone wheel in the present invention is 10 mm, the geometric slip=0 when the transmission ratio is 1 to 1, and the maximum geometric slip within the range of 1 to 0.4 to 2.5 is less than 0.04; The geometric slip of the present invention in the entire range of adjustable transmission ratio is very small, almost negligible, and can effectively improve the quality and performance of the product, so that it can better adapt to the working conditions of various transmission machinery. At present, the same type of cone Wheel CVTs can't do it

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