An electronically controlled electric mechanical automatic transmission device and shifting method for preventing wear and tear of a shift fork

Abstract

The invention discloses an electronically controlled electric mechanical automatic transmission preventing shifting fork from wearing and a gear shifting method. The screw reduction mechanism and the pulling head form the screw transmission cooperation, the ball screw reduction mechanism is connected with the output shaft of the shift motor, and the shift motor is fixedly installed on the outer side wall of the support; the other part of the pulling head One end is in contact with the top slot of the fork, the fork is fixedly mounted on the fork shaft, the two ends of the fork shaft are slidingly fitted on the fork shaft frame, and the fork shaft frame and the fork shaft frame are A gear calibration mechanism is arranged between the fork shafts, and a sliding block is installed at the end of the fork. And by using the elastic limit devices added at both ends of the support, the control strategy can be simplified, and the accuracy and effectiveness of the retraction amount after gearing can be reliably realized without affecting the success rate of shifting.

Description

technical field [0001] The invention belongs to the technical field of automobile transmission transmission, and in particular relates to a device and a shifting method for reducing the wear of a shift fork adopted by an electronically controlled mechanical automatic transmission for a pure electric vehicle. Background technique [0002] With the development of automobile technology, automatic transmissions have been widely used in various vehicles. Mechanical automatic transmissions have been rapidly popularized due to their advantages such as simple structure, high transmission efficiency, and good reliability. The electronically controlled electric system that uses the motor to drive the shift actuator eliminates the need for complex energy supply devices and pipeline systems required by the pneumatic and hydraulic control mechanisms, and has the advantages of simple structure, low cost, strong adaptability to the environment, and low energy consumption. More importantly...

AI Technical Summary

Problems solved by technology

Since the shift fork is still and the synchronizer rotates with the gears at high speed after the gear shifting is over, although the gear shifting motor has stopped applying force at the end of the gear shifting, there is a certain self-locking torque in the deceleration device, which causes the actuator to be locked. The pressing force generated by elastic deformation during the shifting process cannot be completely canceled. The contact surface between the sliding block and the coupling sleeve is still in a pressing state and continues to slide, which will easily lead to early wear of the shift fork and affect reliability.

[0004] Currently widely used gearshift transmission scheme (including gearshift motor, gearshift position sensor, ball screw deceleration mechanism, support, shifting head and other components), based on experimental verification, adopts the method of reducing the self-locking torque of the deceleration mechanism, or increasing it to the gear The accuracy of the position, or reducing the gearing torque at the end of the gear shift to prevent the sliding block from being pressed tightly with the coupling sleeve, the effect is not significant

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