Adaptive continuously variable transmission for hydraulic planetary gear

Abstract

The invention belongs to the field of continuously variable transmissions. An adaptive continuously variable transmission for a hydraulic planetary gear has the greatest technical advantages that an auto-adaptive continuously variable transmission which is high in efficiency, high in power, low in cost, long in service life and simple in structure is achieved, and the efficiency of an engine is improved by over 30 percent. The adaptive continuously variable transmission for the hydraulic planetary gear has the greatest innovation points that an improved hydraulic torque converter and a planetary gear set adopt a parallel principle without the adoption of a conventional AT series structure, a turbine of the hydraulic torque converter is required to be connected with a fixed piece outside driving and driven elements of the planetary gear set, and a pump wheel is required to be connected with the driven element; the planetary gear set has five basic forms namely a single-row planetary gear structure, a double-row planetary gear structure, an external meshed planetary gear structure and a differential planetary gear structure; the improved hydraulic torque converter is combined with the five basic structural forms of the planetary gear set respectively to form eight specific structural types of the continuously variable transmission.

Description

Technical field [0001] The invention belongs to the technical field of variable speed transmission, and is practically applied to all motor vehicles and equipment requiring variable speed. Background technique [0002] The performance of each brand of gearboxes that occupy the mainstream position in the existing technology has its own strengths, and no one can eliminate them. MT manual transmission is loved by many people for its high mechanical transmission efficiency and great driving pleasure. The traditional automatic transmission AT, with its mature technology and reliable performance, simple operation and occupying a large market, CVT steel belt cone-disc type Continuously variable transmission, with its high transmission efficiency and continuously variable transmission performance, enables it to find the best matching point with the engine at any speed ratio, so its market share is increasing year by year; DSG dual-clutch transmission, As well as fast shifting speeds and...

AI Technical Summary

Problems solved by technology

However, our country is very backward in the field of high-end gearboxes, 80% rely on imports, and the remaining 20% ​​are also produced by joint ventures, which are basically controlled by others. Although foreign manufacturers have relatively advanced technologies and mature products, they all have their own. Insurmountable disadvantages: AT automatic transmission is a direct power transmission element because the hydraulic torque converter is directly connected in series with the planetary gear set, and its high-efficiency range is narrow, so its efficiency is low, and in order to improve efficiency, it is It is necessary to increase gears, which directly leads to a complex structure, an increase in costs, and a decrease in reliability. The DSG dual-clutch gearbox, which is actually a combination of two manual gearboxes, only intervenes in a highly automatic and intelligent electronic control system, so the cost It is very high, and the reliability is not perfect. The AMT mechanical automatic transmission is only the automatic control of the manual transmission. It is inevitable to shift gears slowly and frustratingly; The cost is low, but it is cumbersome to operate and the obvious disadvantage of gear switching is irreparable

The above-mentioned gearboxes have different structures and performances, but one thing is the same: they are all stepped transmissions. Except for MT manual, others are automatically controlled stepped transmissions. The biggest feature of stepped transmissions is: The more gears in the entire transmission ratio range, the higher the efficiency, but the more complex the structure, the lower the reliability, and the larger the gap between the two gears, the lower the efficiency. Therefore, if there are infinite gears in the entire transmission ratio range, Then there is no doubt that its transmission efficiency is the highest, and the comfort and power performance are the best. This is the continuously variable transmission.

However, although the continuously variable transmission is the most ideal transmission form and the ultimate goal of the variable transmission, the friction transmission CVT in the prior art is not as efficient as the step transmission MT. This is because of friction and slip and control The system consumes part of the power, and more importantly, in the face of many rapidly changing road environments, its intelligent control system will never be able to achieve automatic adaptive stepless speed change capability, so its low efficiency is inevitable. The big flaw is that limited by material technology, high-power transmission cannot be realized, so the friction transmission CVT will never achieve the ideal transmission effect

As for some gear meshing transmissions, different research and development ideas have led to many strange design concepts, but these design concepts are basically divided into two categories: one is through variable diameter gears or deformed gears, etc., but they are all trapped in Structural limitation defects; the other is to use planetary gears to realize stepless speed change by controlling one of its degrees of freedom, but no matter how ingenious its design structure is, it can only be in the end: stall "stepless speed change" so it doesn't make any sense

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