Electric automatic shift device of motor vehicle

Abstract

The invention discloses an electric automatic shift device of a motor vehicle. A shift motor drives a shift finger through a transmission device to drive a shift fork to slide to and fro along a shift shaft. The electric automatic shift device also comprises a shell, and a shift spring I and a shift spring II which are arranged in the shell; a slide block is fixedly arranged at two sides of the shift finger along the shift moving direction respectively; the shift spring I and the shift spring II are propped at two sides of the shift finger along the shift moving direction through the corresponding slide blocks thereof; and the shift spring II is propped between a reciprocating motion power output shaft of the transmission device and the slide block corresponding to the shift spring II. The electric automatic shift device of the motor vehicle can avoid overlarge impact borne by a shift mechanism, realize soft shift motion and improve the stability and accuracy of an engagement mechanism during operating so as to improve the reliable operation of engagement, reduce the abrasion and impact of the synchronizer slide blocks at the same time of ensuring enough shift force, and reduce the fault rate and maintenance cost of the motor vehicle; and the electric automatic shift device has the advantages of less mass, simple structure, reliable work and low manufacturing cost.

Description

technical field [0001] The invention relates to a gear shifting assembly of a motor vehicle, in particular to an electric automatic gear shifting device of a motor vehicle. Background technique [0002] The shift actuator of the electromechanical automatic transmission mainly adopts two driving methods: electro-hydraulic and electro-electric. The electronically controlled electric shift actuator is widely used because of its small size, compact structure, light weight and low cost. The electromechanical automatic transmission realizes the shifting action of the traditional manual transmission by automatically controlling the shifting actuator. It is realized through a purely mechanical transmission process, mainly including a servo motor and a drive device. The servo motor drives the gear shift through the drive device. The shifting fork realizes gear shifting, eliminates manual operation, has a high degree of automation, and saves the driver's labor. Although the automati...

AI Technical Summary

Problems solved by technology

However, the operating environment and road conditions of motor vehicles are relatively complex and changeable. When the shift process cannot be completed smoothly due to environmental factors, the motor drives the mechanical mechanism to continue the shift process, which will inevitably have an impact on the shift mechanism. The force will cause the deformation of the shifting mechanism, and the excessive pressure between the slider and the synchronizer gear sleeve will cause the slider to wear, deteriorating the operating condition of the motor vehicle, and increasing the failure rate and maintenance cost

[0003] In order to solve the above problems, there is a mechanism that buffers the shifting process by setting springs. However, this mechanism cannot guarantee the stability of the shifting process, resulting in difficulties in shifting gears, malfunctions, and operational difficulties.

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