Planetary transmission based on magneto-rheological gear shifting

Abstract

The invention discloses a planetary transmission based on magneto-rheological gear shifting. A planetary gear of the planetary transmission based on magneto-rheological gear shifting is meshed with a sun gear shaft and a gear ring. A planet carrier is fixedly connected with a planet wheel shaft; a first coil is embedded in the inner wall of the box body, and the space between the first coil and the gear ring is filled with first magneto-rheological fluid; a second coil is mounted between a gear ring output sleeve and a box body, and a second magneto-rheological fluid is filled between a planet carrier output sleeve and the gear ring output sleeve which are on the inner peripheral side of the second coil; a locking sleeve and an output gear sleeve are in key connection with the inner peripheral side of the planet carrier output sleeve; the locking sleeve and the sun wheel shaft are coaxially arranged; and the output gear sleeve is fixedly connected to the peripheral side of one end of the locking sleeve, and one end of the output gear sleeve extends out of the box body. According to the planetary transmission based on magneto-rheological gear shifting, stepless adjustment of output torque can be achieved, a friction pair and a hydraulic control mechanism are not needed, the weight and the size of the transmission can be effectively reduced, the transmission efficiency is improved, abrasion and impact of parts in the gear shifting process are avoided, the reliability is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of vehicle transmission, in particular to a planetary transmission based on magnetic current shift gears. Background technique [0002] At present, high-power electric drive tracked vehicles usually use a two-speed planetary transmission in the transmission system. The purpose is to expand the torque and speed range of the drive motor, so that the vehicle can obtain better dynamic performance, such as increasing the gradeability, acceleration and maximum speed. In order to realize the integrated layout and reduce the size of the transmission device, a planetary transmission with compact structure, high transmission power, and coaxial input and output is generally used. The planetary transmission shift mechanism used in the prior art mostly adopts wet multi-disc clutches. [0003] The wet multi-plate clutch mainly transmits power by friction torque. The hydraulic oil circuit of the clutch is divided into a ...

AI Technical Summary

Problems solved by technology

[0004] The application of wet multi-disc clutches in high power density transmission systems has more prominent problems. At high speeds, it will generate a large belt displacement torque, which restricts the improvement of transmission efficiency and increases the burden of lubrication and heat dissipation. In the process of gear shifting, the hydraulic control system needs to provide a large hydraulic thrust to engage, so it is necessary to equip the transmission system with a special oil tank, hydraulic pump and pipeline, etc., which greatly increases the weight and volume of the transmission device, and is especially unsuitable for use. in electric vehicles

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