Automatic speed change electro-hydraulic control valve of tractor

Abstract

The invention discloses an automatic speed change electro-hydraulic control valve of a tractor. The automatic speed change electro-hydraulic control valve comprises a valve body and a plurality of valve blocks arranged on the valve body, the valve blocks communicate with a flow channel in the valve body to form a main oil way and a plurality of working oil ways, the working oil ways are arranged in parallel and connected with the main oil way, and each working oil way comprises a power output control oil way, a high-low speed gear shifting control oil way and a front and rear gear control oilway; and each power output control oil way comprises a second one-way valve and a first reversing solenoid valve, each high-low speed gear shifting control oil way comprises a third one-way valve anda second reversing solenoid valve, and each front and rear gear control oil way comprises a fourth one-way valve and a three-position four-way third reversing solenoid valve. According to the automatic speed change electro-hydraulic control valve of the tractor, mechanical gear shifting operation rods in the tractor are replaced by the reversing solenoid valves, gear shifting of the tractor is controlled through the reversing solenoid valves, the automatic speed changing sensitivity of the tractor is high, the driving safety can be greatly improved, the labor intensity is greatly reduced, theworking reliability is improved, and the electro-hydraulic control valve is more suitable for severe working environments.

Description

technical field [0001] The invention relates to the technical field of hydraulic valve groups, in particular to an electro-hydraulic control valve for automatic variable speed of a tractor. Background technique [0002] The traditional mechanical control valve for high-horsepower tractors consists of two parts: the main control valve group and the high and low speed valve group. The valve group includes high gear (H), low gear (R) and shock valve. [0003] At present, the domestic tractor industry with more than 120 horsepower mostly uses hydraulic machinery for manual steering and gear shifting. The structure is complicated, the response is slow, the operation is frequent, the labor intensity is high, the failure rate is high, and the safety performance is poor. It is no longer suitable for the future development direction of the industry. [0004] With the intensive production of agriculture, the use of automatic variable speed electro-hydraulic control for farming machin...

AI Technical Summary

Problems solved by technology

[0003] At present, the domestic tractor industry with more than 120 horsepower mostly uses hydraulic machinery for manual steering and gear shifting. The structure is complicated, the response is slow, the operation is frequent, the labor intensity is high, the failure rate is high, and the safety performance is poor. It is no longer suitable for the future development direction of the industry.

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