Long-cone rolling cone type infinitely variable speed transmission mechanism

Abstract

The invention discloses a long-cone rolling cone type infinitely variable speed transmission mechanism which comprises a first long-cone roller group, a second long-cone roller group and a middle long-cone roller group, wherein the first long-cone roller is connected with a first roller shaft; the second long-cone roller is connected with a second roller shaft; a middle rolling cone wheel is movably connected with a connecting device; and a first conical surface on the middle rolling cone wheel is in contact transmission with the first long-cone roller, and a second conical surface on the middle rolling cone wheel is in contact transmission with the second long-cone roller. The contact position of the middle rolling cone wheel on the two long-cone rollers is adjusted, the working radius of the two long-cone rollers can be continuously changed, and infinitely variable speed transmission is realized. The shape of the middle rolling cone wheel is improved, the geometrical slippage in a cone wheel mechanical friction transmission mechanism is effectively reduced, and the transmission efficiency and power are improved. The long-cone rolling cone type infinitely variable speed transmission mechanism can be applied to the fields of various vehicles, ships and mechanical transmission.

Description

technical field [0001] The invention relates to the technical field of mechanical friction transmission, in particular to a long cone-roller type continuously variable transmission mechanism. Background technique [0002] In the last ten years, CVT (Continuously Variable Trans-mission) technology has made great progress, and is currently widely used in the field of low-power vehicles. There are many types of continuously variable transmissions, among which the belt drive type and the traction drive type have been applied in automobiles, and they all transmit power by friction. [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 working conditions improves the fuel economy of the vehicle. However, currently limited by...

AI Technical Summary

Problems solved by technology

However, currently limited by metal strip materials and technology, the manufacturing cost is very high

[0004] Cone wheel friction continuously variable transmission mainly relies on the contact friction and lubricating oil film traction of the main and driven rigid elements (or through intermediate elements) for transmission, and can perform stepless speed change by changing the working radius of the contact point; it has the characteristics of stable transmission , low noise, simple structure, overload protection effect, and various forms; at present, the widely used ones are: cone-disc ring-disc type, multi-disc type, steel ball cone wheel type, diamond cone type, planetary cone-disk type and Planetary ring cone type continuously variable transmission, etc.; however, in the bevel wheel friction type continuously variable transmission, when the bevel wheel and the contacted transmission element are under load and friction work, due to the geometry of the bevel wheel and the contacted transmission element, the two The speed distribution in the contact area of ​​the rolling elements is different, and geometric sliding will occur between the two rolling elements. The geometric sliding in the mechanism will increase the temperature of the traction oil and reduce the traction coefficient, resulting in a decrease in the transmission force and efficiency of the transmission. Reduced transmission life due to wear on the traction surfaces

[0005] In the prior art, in order to reduce the spin phenomenon of the friction drive contact area in the bevel wheel friction continuously variable transmission, many designers will try to reduce the contact area between the bevel wheel and the contacted transmission elements according to the size of the transmission power , to reduce the geometric slip rate; but to minimize the geometric slip rate in the bevel friction continuously variable transmission, only when the contact area between the bevel wheel and the contacted transmission element is a point contact, in theory There will be no geometric sliding, 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-bearing capacity and the smaller the transmission power; the difference between the above two Produce contradictory phenomena, how to solve the above-mentioned technical problems, there is no ideal technical solution in this field

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