Shifting fork abrasion prevention device of electrically-controlled electrodynamic type machine automatic transmission and gear shifting method

Abstract

The invention discloses a shifting fork abrasion prevention device of an electrically-controlled electrodynamic type machine automatic transmission and a gear shifting method. The shifting fork abrasion prevention device comprises a supporting seat, a ball screw speed reduction mechanism is installed inside the supporting seat through a bearing seat in a supported mode, the ball screw speed reduction mechanism and a shifting head form screw transmission fit, the ball screw speed reduction mechanism is connected with an output shaft of a gear shifting motor, the gear shifting motor is fixedly mounted on the outer side wall of the supporting seat, the other end of the shifting head is in contact fit with an inserting groove in the top end of a shifting fork, the shifting fork is fixedly installed on a shifting fork shaft, the two ends of the shifting fork shaft are installed on a shifting fork shaft frame in a sliding fit mode, a gear calibration mechanism is arranged between the shifting fork shaft frame and the shifting fork shaft, and a sliding shifting block is installed at the tail end of the shifting fork. According to the shifting fork abrasion prevention device of the electrically-controlled electrodynamic type machine automatic transmission and the gear shifting method, elastic limiting devices which are additionally arranged at the two ends of the supporting seat are utilized so that the control strategy can be simplified, and the accuracy and effectiveness of the returning amount after gear engagement can be reliably realized under the condition that the gear shifting success rate is not influenced.

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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