Automatic gear shift mechanism for transmission

Abstract

The invention provides an automatic shift mechanism of speed changer. The mechanism comprises a shift motor, a driving device, a shift rod, a shift head, a shift block, a declutch shift shaft and a selector fork, wherein the selector fork is fixed on the shift rod, the shift block and the selector fork are fixed on the declutch shift shaft, the shift motor drives the shift rod and the shift head to rotate by the driving device, and the shift head drives the declutch shift shaft and the selector fork to do linear action by the shift block. The mechanism also comprises a gear spacing device, and the device comprises a first spacing check ring and a second spacing check ring which are respectively fixed at both ends of the declutch shift shaft. When the invention executes shift operation, the first spacing check ring or the second spacing check ring is blocked by the speed changer main body when the declutch shift shaft moves to the position of a running car, and consequently, the reliable shift operation can be ensured, and the phenomenon of shift overshoot cannot occur. Therefore, the invention has the advantages of simple structure and convenient operation. If the speed changer has multiple traveling gears, the two automatic shift mechanisms can be combined for using.

Description

technical field [0001] The invention relates to an automatic shift mechanism of a transmission, in particular to an automatic shift mechanism of a transmission in a hybrid electric vehicle. Background technique [0002] In hybrid electric vehicles, especially electric-based hybrid electric vehicles, due to the difference between the dynamic characteristics of the electric motor and the dynamic characteristics of the engine, its transmission system often does not need as many gears as traditional fuel vehicles. Usually, in a hybrid electric vehicle, there are generally 2 to 3 forward gears. In order to realize the switching of power modes and gears, usually only one or two shift forks are required to complete. In this kind of transmission system with only one or two shift forks, if the traditional gear selection and shifting mechanism is used, not only the structure is complicated, but also the gear shifting process has to go through three processes: back gear, gear selection...

AI Technical Summary

Problems solved by technology

For motor gear shifting, motor gear shifting does not have the feel of manual gear shifting. Small changes in the current and power-on time of the gear shifting motor will easily cause errors in the motor rotation angle, resulting in overshooting or inadequate gear shifting, resulting in Shifting noise is generated, which can easily damage the shifting mechanism and synchronizer; or the gear position is inaccurate, and the correct shifting operation cannot be performed

Since there is no feel like manual shifting, the hydraulic cylinder shifting mechanism also has the above-mentioned problems.

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