Compact type constraint number shifting planetary gear train transmission

Abstract

The invention discloses a compact type constraint number gear shifting planetary gear train transmission, and belongs to the technical field of mechanical transmission and transmission design and manufacturing. The compact type constraint number gear shifting planetary gear train transmission comprises an input shaft, an output shaft and a plurality of planetary gear trains, and is characterized in that: a state that the degree of freedom is equal to or larger than 1 is constructed by changing the constraint number of the planetary gear trains, so that a fixed-transmission-ratio output gear or a neutral gear is obtained, when the degree of freedom of the planetary gear trains is equal to 1, a fixed speed ratio is output and corresponding gear output is formed, and when the degree of freedom is greater than 1, power cannot be output, thereby being equivalent to a neutral gear; and through parallel connection or series connection combination of the plurality of groups of planetary gear trains, gear output of different transmission ratios can be obtained. Gear shifting of the compact type constraint number gear shifting planetary gear train transmission is completed by controlling a brake, the clutch starting function is achieved, the types of parts are greatly simplified, and the gear train transmission has the advantages of being compact in structure, small in size, low in internal friction, light in weight, low in cost and the like.

Description

technical field [0001] The invention belongs to the technical field of mechanical transmission and speed changer design and manufacture. Background technique [0002] The existing AT automatic transmission basically adopts a planetary gear train structure, and the way to control the gear shift is basically to change a number of clutches and brakes. Due to factors such as space layout, the internal structure of the AT transmission is complicated, taking up too much space, and multiple sets of wet clutches. The drag loss of the friction plate reduces the efficiency of the AT, complicates the control of the oil circuit system, and increases the production cost and maintenance cost. Contents of the invention [0003] The present invention proposes a "compact constrained number shift planetary gear train transmission", which can effectively solve the above problems, and has the characteristics of "compact, lightweight, high efficiency, low cost" and the like. [0004] Its spec...

AI Technical Summary

Problems solved by technology

[0002] The existing AT automatic transmission basically adopts a planetary gear train structure, and the way to control the gear shift is basically to change a number of clutches and brakes. Due to factors such as space layout, the internal structure of the AT transmission is complicated, taking up too much space, and multiple sets of wet clutches. The drag loss of the friction plate reduces the efficiency of the AT, complicates the control of the oil circuit system, and increases the production cost and maintenance cost

Images