Speed change control mechanism and medium-pressure servo gear shifting power-assistance air cylinder thereof

Abstract

The invention discloses a speed change control mechanism and a medium-pressure servo gear shifting power-assistance air cylinder thereof. The medium-pressure servo gear shifting power-assistance air cylinder comprises a cylinder body, and a valve body, an air cylinder piston and a rocker arm that are mutually connected, wherein the valve body is provided with a left cavity air vent and a right cavity air vent; the interior of the valve body is connected with a valve body piston; the valve body piston is connected with a draw bar, and provided with an air inlet passage and an air exhaust passage; the air inlet passage is provided with a left cavity air inlet and a right cavity air inlet; the air exhaust passage is provided with a left cavity exhaust vent and a right cavity exhaust vent; when the valve body piston is positioned in the middle, the left cavity air inlet and the right cavity air inlet are communicated with the left cavity air vent and the right cavity air vent correspondingly; when the valve body piston moves leftwards, the left cavity air vent is communicated with the left cavity exhaust vent and the right cavity air inlet is communicated with the right cavity air vent to drive the air cylinder piston to move leftwards; and when the valve body piston moves rightwards, the right cavity air vent is communicated with the right cavity exhaust vent and the left cavity air inlet is communicated with the left cavity air vent to drive the air cylinder piston to move rightwards. The air cylinder realizes power assistance during gear shifting and improves an operation experience.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a transmission control mechanism and a medium-pressure servo shift assist cylinder. Background technique [0002] At present, mechanical transmissions are generally installed on medium and heavy vehicles in China, and long-distance variable speed control mechanisms are used. Remote shifting operation is used when the transmission is arranged far away from the seat of the cab, and the transmission is manipulated through a shift transmission mechanism such as a lever system or a cable for shifting operations. Shift assist refers to the pre-selected pneumatic shifting method to improve the handling convenience of the transmission. [0003] In the prior art, two kinds of speed change manipulation mechanisms are usually used: [0004] The first one is to adopt a speed change control mechanism without a gear shift assist system, which will cause the vehicle to have heavy gears wh...

AI Technical Summary

Problems solved by technology

The mechanism pushes the cylinder piston to run by outputting electrical signals, and does not have a follow-up function. The cylinder directly pushes the shift rocker arm to the maximum position of the shift stroke, which cannot achieve a good control feel.

[0006] In addition, the operation of the "electric control-pneumatic" shift assist mechanism needs to calculate the stroke of the cylinder in advance according to the stroke of the gearbox, and then use the electric signal to perform one-step control, so the shift assist mechanism is provided by the transmission manufacturer. Integrated on the transmission to match the supply, the vehicle manufacturer must purchase the transmission and shift assist mechanism together, resulting in higher costs for the vehicle manufacturer

Images