An automatic shifting device for a planetary gear train transmission

Abstract

The invention discloses an automatic gear shifting device for a planetary gear train transmission. The automatic gear shifting device comprises a driving device, a transmission device and a group of locking devices, wherein the group of locking devices are distributed on the periphery of a rotating shaft of the transmission; one end of the transmission device is connected with the driving device; the other end of the transmission device is connected the group of locking devices; the locking devices can rotate around the rotating shaft of the transmission under the driving of the transmission device and can be gradually close to and press the rotating shaft of the transmission; and the locking devices are provided with elastic parts, and are connected with the transmission device through the elastic parts. According to the design, through the manner that the rotating shaft is gradually locked till complete locking through the locking devices, the stable gear shifting of the transmission can be achieved, the sudden pause feeling caused by sudden speed change during the driving process can be relieved, the driving feeling is optimized, and the safety of driving is improved; and firstly, rotation speed of the rotating shaft of the transmission is slowly reduced through soft contact of the elastic parts, then, the rotating shaft of the transmission is locked through hard contact of a mechanical structure, and the locking process is stable and reliable.

Description

technical field [0001] The invention relates to the technical field of planetary gear transmissions, in particular to an automatic shifting device for planetary gear transmissions. Background technique [0002] The shifting device of the electric power-assisted bicycle on the market mainly is that the rider changes the size of the sprocket wheel engaged with the chain by pulling the handle. This kind of external shifting is difficult to adjust due to the shifting cable, and the cable is affected by factors such as elongation, which will cause shifting failure or disordered gears, which will affect riding experience and even affect riding safety. When you need to manually adjust the gear, you can't do automatic gear adjustment, which affects the riding experience to a certain extent. [0003] In Chinese Patent Application Publication, CN2015104174416, aiming at the problems of difficult adjustment and failure of manual gear shifting, a gear shifting device for a two-speed tr...

AI Technical Summary

Problems solved by technology

This kind of external shifting is difficult to adjust due to the shifting cable, and the cable is affected by factors such as elongation, which will cause shifting failure or disordered gears, which will affect riding experience and even affect riding safety. It is necessary to manually adjust the gear when it is used, and it cannot be automatically adjusted, which affects the riding experience to a certain extent.

[0003] In Chinese Patent Application Publication, CN2015104174416, aiming at the problems of difficult adjustment and failure of manual gear shifting, a gear shifting device for a two-speed transmission of an electric vehicle is disclosed. Pull the gear selection spline to mesh with the high-speed gear or with the low-speed gear through the pull of the gear selection dial

This design uses electric shifting instead of manual shifting to make shifting more convenient. However, when shifting, the speed changes suddenly, and the feeling of frustration is strong, which affects riding experience and riding safety.

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