All-hydraulic steering control valve
A steering control and full-hydraulic technology, applied in the field of steering control valves and full-hydraulic steering control valves, can solve problems such as increased failure rate, steering failure, and low efficiency, and achieve the goals of reducing throttling loss, facilitating manufacturing, and improving efficiency Effect
Inactive Publication Date: 2009-07-08
ZHENJIANG DADI HYDRAULIC LIABILITY
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Problems solved by technology
[0002] At present, the fully hydraulic steering valve used in the main engine of construction machinery completely relies on small orifice throttling to control the pressure, so the system flow loss is serious, the efficiency is low, and the labor intensity of the operator is inevitably increased. It is easy to block due to the pollution of hydraulic oil, which will lead to steering failure and increase the failure rate
In addition, there are also disadvantages such as poor hand feeling when operating the steering wheel, and lack of reliable protection for the steering cylinder when the steering external resistance of the main engine suddenly increases
Method used
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Embodiment 1
[0020] The full hydraulic steering control valve of this embodiment is as follows: figure 1 As shown, including hydraulic cylinder a and reversing valve c. Such as figure 2 As shown, the cylinder body 4 of the hydraulic cylinder is divided into an annular upper chamber and a lower chamber by a piston 6 forming an oil return chamber in the middle. Axial piston springs 5 are respectively housed in the upper and lower chambers. The upper end of the piston 6 is fixed with a nut 25, which forms a screw pair with the axially constrained external screw rod 3, and the center hole at the lower end of the piston 6 is in dynamic cooperation with the positioning pin shaft 10 fixed on the cylinder body 4. More specifically, The inner spline at the center of the lower end of the piston 6 is in motion fit connection with the outer spline of the positioning pin shaft 10 . The upper end of the externally connected screw rod 3 is fixed for connecting the connecting block 1 of the steering...
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The invention relates to a full hydraulic steering control valve, and belongs to the technical field of hydraulic transmission and control. The interior of a cylinder body of a hydraulic oil cylinder of the steering control valve is divided into a first cavity and a second cavity by a piston, and the first cavity and the second cavity are provided with an axial piston spring respectively. One end of the piston and an externally-connected screw rod which is axially restricted form a screwed pair. Both ends of the steering control valve form a first control cavity and a second control cavity respectively, and the first control cavity and the second control cavity are provided with a valve control spring respectively. Two oil ports on a load side of the direction change valve are externally connected with both end ports of a steering oil cylinder. The middle part of the piston forms an oil return cavity which is communicated with the first cavity and the second cavity respectively through a throttle hole, and the first control cavity and the second control cavity are communicated with the first cavity and the second cavity respectively through a throttle hole. The full hydraulic steering control valve uses skillful structural design for greatly reducing the throttle loss of a steering system, and has the functions of automatic buffer, automatic reset, compensation and unloading and the like. Therefore, the full hydraulic steering control valve greatly improves efficiency, saves energy, and has the advantages of simple structure and convenient manufacture.
Description
technical field [0001] The invention relates to a steering control valve, in particular to a full-hydraulic steering control valve of a large construction machine, especially a wheel loader, and belongs to the technical field of hydraulic transmission and control. Background technique [0002] At present, the fully hydraulic steering valve used in the main engine of construction machinery completely relies on small orifice throttling to control the pressure, so the system flow loss is serious, the efficiency is low, and the labor intensity of the operator is inevitably increased. It is easy to block due to the pollution of hydraulic oil, which will lead to steering failure and increase the failure rate. In addition, there are also disadvantages such as poor hand feeling when operating the steering wheel, and lack of reliable protection for the steering cylinder when the steering external resistance of the main engine suddenly increases. Contents of the invention [0003] ...
Claims
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Login to View More IPC IPC(8): B62D5/08F15B13/02
Inventor 潘正东丁来镇刘金龙秦志文徐华伟
Owner ZHENJIANG DADI HYDRAULIC LIABILITY