A pressure continuously variable transmission based on nw type double planetary 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, in particular to a continuously variable transmission structure that uses hydraulic speed regulation to perform continuously variable transmission on the basis of an NW type two-degree-of-freedom planetary gear train. The continuously variable transmission structure can be adjusted according to the input power of a motor. The input power of the hydraulic pump and the change of the load are active and continuously variable, which is suitable for the variable speed transmission mechanism of various machines such as vehicles and machine tools. Background technique [0002] Continuously variable transmission devices are mainly divided into mechanical and electrical types. Electric type is currently used more on the market, that is, stepless speed regulation is realized through frequency conversion. However, electrical stepless speed regulation has many insurmountable shortcomings: complex technolog...

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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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