Pressure continuously-variable transmission based on NW-type compound planet gear structure

Abstract

The invention discloses a pressure continuously-variable transmission based on an NW-type compound planet gear structure. A planetary gear train structure is characterized in that a rotating body is arranged in a shell of a rack, three planetary shafts vertically and evenly distributed along the circumference are fixed to the rotating body through a planetary carrier H, and a compound planet gear formed by a small planet gear and a large planet gear is installed on each planetary shaft through a bearing; a transmission gear is externally engaged with an eccentric gear located between each small planet gear and the corresponding large planet gear; a sun gear is located among the three large planet gears. A pressure stepless speed change structure is characterized in that a hollow transmission shaft is arranged in the center of each transmission gear, a hydraulic clutch, a hydraulic motor and a pressure sensor are sequentially arranged on each hollow transmission shaft, each hollow transmission shaft is driven by the corresponding hydraulic motor, hydraulic oil is input into the hydraulic clutches through hollow channels of the hollow transmission shafts to transmit power, and pressure stepless speed changing is achieved. The pressure continuously-variable transmission is simple and compact in structure, low in manufacturing cost, stable in speed change and as high as 99% in transmission efficiency.

Description

technical field [0001] The invention relates to a continuously variable transmission, especially on the basis of the NW type two-degree-of-freedom planetary gear train, a continuously variable transmission structure that uses hydraulic speed regulation to perform stepless transmission. The continuously variable transmission structure can be used according to the input power of the motor, The input power and load of the hydraulic pump are actively and continuously variable, and are suitable for variable speed transmission mechanisms of various types of machinery such as vehicles and machine tools. Background technique [0002] CVT devices are mainly divided into two categories: mechanical and electrical. The electric type is currently used more in the market, that is, the stepless speed regulation is realized through frequency conversion. However, there are many shortcomings that are difficult to overcome in the electric stepless speed regulation: complex technology, high co...

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Problems solved by technology

However, there are many shortcomings that are difficult to overcome in the electric stepless speed regulation: complex technology, high cost, and difficult maintenance; generation of harmonics pollutes the power grid; output PWM waves cause additional heat generation of motors and cables; generation of common-mode voltage is possible It will reduce the life of the motor shaft; it will bring extra noise to the motor; the energy consumption of the motor will increase by 3-5% compared with direct starting after the motor is controlled by a frequency converter; The occasions are limited, and it is only suitable for places that require high speed regulation accuracy, good speed regulation performance, and small starting torque

Therefore, the continuously variable transmission device is only suitable for small electric vehicles, and its application range is limited

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