Bulldozer Electro-hydraulic Synergetic Control Transmission System

Abstract

The invention relates to the technical field of bulldozers, in particular to an electric-hydraulic cooperative control type speed changing system for a bulldozer. The electric-hydraulic cooperative control type speed changing system for the bulldozer comprises a hydraulic control handle. A button used for controlling a speed gear electromagnetic valve to be powered on or powered off is arranged on the hydraulic control handle, and by powering on or powering off the speed gear electromagnetic valve, pilot oil is made to enter different oil ports of a speed gear control device, a valve element of the speed gear control device moves to the corresponding gear under the effect of oil pressure, and thus speed gear switching is achieved; and a valve element of a direction gear control device is controlled to move to the corresponding position by controlling oil entering the direction gear control device through the hydraulic control handle, and thus direction gear switching is achieved. According to the electric-hydraulic cooperative control type speed changing system for the bulldozer, the advantages of simple structure and good pressure regulating performance of mechanical speed valves and direction valves are reserved, impact in the gear shifting process of the whole bulldozer is reduced through an operating way based on cooperation of electric control and hydraulic control, and the operating comfort is improved; and meanwhile, cost is greatly reduced, and the market competitiveness of products is improved.

Description

technical field

[0001] The invention relates to the technical field of bulldozers, in particular to an electro-hydraulic coordinated control transmission system of a bulldozer. Background technique

[0002] The shifting system of the bulldozer is used to realize the shifting of the bulldozer. The traditional shifting method is the mechanical link operation, but the mechanical link operation has the disadvantages of large operating force, inconvenient installation, difficult debugging and poor operating comfort.

[0003] Electronic control and hydraulic control transmission can overcome the shortcomings of mechanical linkage control, but a single electronic control or hydraulic control has its shortcomings: the electronic control transmission valve is still in its infancy in China, and the system cost is high; the hydraulic control transmission valve The switching of the position of the main spool is achieved through the hydraulic control pilot, and the cost and control are l...

Examples

Embodiment Construction

[0020] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0021] Such as figure 1 As shown, the present invention provides a bulldozer electro-hydraulic cooperative control transmission system, including a fuel tank 1, a transmission pump 2, an oil filter 3, a hydraulic control handle 4, a neutral lock valve 5, a directional gear control device 6, and a directional valve 7 , Direction clutch, speed gear solenoid valve 10, speed gear control device 11, speed valve 12, gear clutch, pressure regulating valve 16 and quick return valve 17.

[0022] The oil in the oil tank 1 is divided into three paths after passing through the variable speed pump 2 and the oil filter 3, among which:

[0023] The first oil flow sequentially through the hydraulic control handle 4, the neutral lock valve 5 and the direction gear control device 6, and the direction gear control de...

technical field

[0001] The invention relates to the technical field of bulldozers, in particular to an electro-hydraulic coordinated control transmission system of a bulldozer. Background technique

[0002] The shifting system of the bulldozer is used to realize the shifting of the bulldozer. The traditional shifting method is the mechanical link operation, but the mechanical link operation has the disadvantages of large operating force, inconvenient installation, difficult debugging and poor operating comfort.

[0003] Electronic control and hydraulic control transmission can overcome the shortcomings of mechanical linkage control, but a single electronic control or hydraulic control has its shortcomings: the electronic control transmission valve is still in its infancy in China, and the system cost is high; the hydraulic control transmission valve The switching of the position of the main spool is achieved through the hydraulic control pilot, and the cost and control are l...

Examples

Embodiment Construction

[0020] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0021] Such as figure 1 As shown, the present invention provides a bulldozer electro-hydraulic cooperative control transmission system, including a fuel tank 1, a transmission pump 2, an oil filter 3, a hydraulic control handle 4, a neutral lock valve 5, a directional gear control device 6, and a directional valve 7 , Direction clutch, speed gear solenoid valve 10, speed gear control device 11, speed valve 12, gear clutch, pressure regulating valve 16 and quick return valve 17.

[0022] The oil in the oil tank 1 is divided into three paths after passing through the variable speed pump 2 and the oil filter 3, among which:

[0023] The first oil flow sequentially through the hydraulic control handle 4, the neutral lock valve 5 and the direction gear control device 6, and the direction gear control de...

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