Actuator for shift transformation of automatic gearbox of heavy type commercial automobile

Abstract

The invention discloses an actuator for the shift transformation of an electrically-controlled pneumatic mechanical automatic gearbox of a heavy type commercial automobile for road transportation; a shift selection multiposition cylinder and a shift transformation multiposition cylinder are arranged outside a shell respectively; the shift selection multiposition cylinder is communicated with a shift selection electromagnetic valve; the inside of the shift selection multiposition cylinder is provided with a shift selection push rod; the other end of the shift selection push rod is connected with a shift selection push block of the shell; a shift selection block, a spring and a shift transformation gear are sleeved on a spline shaft; the shift selection block is extended into a groove at thelower end of the shift selection push block; the outer end of a rack type push rod is extended into the shift transformation multiposition cylinder; the shift transformation multiposition cylinder iscommunicated with a shift transformation electromagnetic valve; the output of parameters of the operating condition is sequentially connected with an electrical control unit and a drive circuit; andthe output of the drive circuit is connected with the shift selection electromagnetic valve and the shift transformation electromagnetic valve respectively. The actuator can carry out accurate positioning on shift selection stroke and shift transformation stroke, solves the problem of inaccurate stroke control in the process of shift transformation and improves the performance of the shift transformation and the reliability of the actuator.

Description

technical field [0001] The invention relates to an electronically controlled mechanical automatic transmission of a road transport vehicle, in particular to an actuator for shifting gears of an electronically controlled pneumatic mechanical automatic transmission of a heavy-duty commercial vehicle. Background technique [0002] The power transmission part of some heavy-duty commercial vehicles is a mechanical transmission with manual shifting, and the transmission mainly uses a fixed-shaft gear mechanism for power transmission. In order to reduce the number of times the driver manually shifts gears during driving and reduce the driver's labor intensity, on the basis of the main structure of the original manual transmission, an electromechanical automatic transmission with a shift actuator controlled by an electronic control unit is adopted. The electromechanical automatic transmission is equipped with an electronic control unit (ECU), which collects vehicle operating paramet...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of complex shifting operation and unreliable gears of multi-gear mechanical transmissions on heavy-duty commercial vehicles, and proposes a simple executive mechanism for gear conversion of electronically controlled pneumatic mechanical automatic transmissions, which can Reduce the friction of the actuator and improve the reliability of the mechanism

Images