Gear choosing and shifting execution mechanism of mechanical automatic transmission

Abstract

The invention discloses a gear choosing and shifting execution mechanism of a mechanical automatic transmission, which comprises a gear choosing and shifting head, a mechanism housing, a gear shifting triple electromagnetic valve and a gear-choosing triple electromagnetic valve. The working piston shaft of a gear-shifting three-position cylinder is fixedly connected with a gear-shifting shaft; the gear-shifting shaft can drive the gear choosing and shifting head to move axially; each of the gear-shifting three-position cylinder and the gear-choosing three-position cylinder comprises a cylinder body; the cylinder body is provided with through holes connected with a locating air cavity and a working air cavity; a locating piston body is arranged in the locating air cavity; a working position body is arranged in the working air cavity; the locating piston body is fixedly connected with a locating piston shaft; the working piston body is fixedly connected with a working piston shaft; the locating piston shaft passes through the through hole to support the front side of the working piston shaft; and the working surface area of the locating piston body is more than that of the working piston body. The three-position cylinder in the gear choosing and shifting execution mechanism of the mechanical automatic transmission has accurate location of the central position and high precision of position feedback signals.

Description

technical field [0001] The invention relates to the field of automatic transmission actuators, in particular to a gear selection and shift actuator of a mechanical automatic transmission. technical background [0002] With the development of automobile technology, automatic transmission technology has gradually entered people's field of vision, and automatic mechanical transmission (AMT, Automated Mechanical Transmission) has become a heavy-duty vehicle automatic transmission due to its advantages of simple structure, low technical difficulty and low development cost. Technology's preferred target. The actuators of the entire AMT system generally have three structural forms: electro-hydraulic, electro-pneumatic and DC motor. Considering the convenience of vehicle air source, simple structure, low cost and other factors, the AMT system of heavy commercial vehicles at home and abroad is generally an electronically controlled pneumatic control system. [0003] At present, the...

AI Technical Summary

Problems solved by technology

When the three-position cylinder of this mechanism performs neutral positioning, the pressure difference between the positioning cylinder and the working cylinder is small, resulting in inaccurate neutral positioning, and the assembly does not include a solenoid valve, which means that the solenoid valve and the actuator are installed separately. The integration level is not high, and the installation is more troublesome

In addition, the assembly uses an angular displacement sensor, but the mechanism itself moves in a straight line, and there must be a conversion mechanism in between, which reduces the accuracy of the position signal

Images