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Power control valve and loader constant variable hydraulic system

A power control valve and hydraulic system technology, which is applied in pump control, mechanical equipment, machine/engine, etc., can solve the problems of insufficient power input and large proportion of input power in the walking system, achieve a wide range of power adjustment, and reduce the size of the pump. Displacement, the effect of reducing energy loss

Active Publication Date: 2016-05-25
GUANGXI LIUGONG MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a loader in view of the shortcomings of the variable pump in the fixed variable hydraulic system of the existing loader that the input power of the pump accounts for a large proportion of the input power of the pump under heavy load due to the output of the rated displacement, which leads to insufficient power input of the walking system. Power control valve used in constant variable hydraulic system and loader constant variable hydraulic system with the power control valve

Method used

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  • Power control valve and loader constant variable hydraulic system
  • Power control valve and loader constant variable hydraulic system

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Embodiment Construction

[0027] The specific implementation will be described below in conjunction with the accompanying drawings.

[0028]In this embodiment, the constant variable hydraulic system of the loader includes a load sensitive variable pump 1, a quantitative pump 5, a distribution valve 14, a pilot valve 11, a shuttle valve 10, a working oil cylinder, an oil tank 4, a hydraulic steering system, and a two-position four-way valve. 9. Power control valve 2, the working cylinder includes bucket cylinder 16, boom cylinder 17, hydraulic steering system includes load-sensitive steering gear 12, load-sensitive flow amplifying valve 13, steering cylinder 15; load-sensitive steering gear 13 and load-sensitive flow The amplifying valve 13 is connected to and controls the steering cylinder 15 connected with the load-sensing flow amplifying valve 13 through the load-sensing flow amplifying valve 13. The confluence oil port of the valve communicates with the P port of the distribution valve 14. The P1 p...

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Abstract

The invention relates to a loader quantitative-variable hydraulic system and aims to overcome the defect that the input power of a variable pump in the existing quantitative-variable hydraulic system accounts for a large amount. The invention further discloses a power control valve. A first cavity in a valve body is communicated with a port PLS and acts on the right end of a main valve element. A valve element spring is disposed at the left end of the main valve element. A valve sleeve sleeves the main valve element. A second cavity is communicated with a port P1 and acts on the right end of the valve sleeve. A third cavity is communicated with a port P and acts on the left end of the valve sleeve. A valve sleeve spring provides leftward elastic force for the valve sleeve. An oil drainage passage communicated with the third cavity and a port T are formed in the main valve element and the valve sleeve. When the main valve element moves leftwards relative to the valve sleeve, the oil drainage passage is communicated. When the main valve element moves leftwards relative to the main valve element, the oil drainage passage is reduced or closed. The power control valve has the advantages that the valve sleeve and the main valve element form a follow-up mechanism, the input power of the variable pump of the loader quantitative-variable hydraulic system can be controlled by the power control valve, and the input power is prevented from accounting for a large amount.

Description

technical field [0001] The invention relates to a loader hydraulic system, in particular to a power control valve used in a loader constant-displacement hydraulic system and a loader constant-displacement hydraulic system with the power control valve. Background technique [0002] At present, the commonly used loader hydraulic systems include quantitative hydraulic systems, fixed variable hydraulic systems and full variable hydraulic systems. The technical characteristics of each hydraulic system are as follows: [0003] The throttling loss, overflow loss, and loss along the way of the quantitative hydraulic system have large power losses and low energy conversion efficiency, but the system is simple in structure and low in cost; [0004] The full variable hydraulic system has no overflow loss, and the throttling loss and the loss along the process are the lowest, the energy conversion efficiency is high, and the energy saving effect is good, but the hydraulic components ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F9/22F04B49/22
Inventor 梁振国莫雄超范武德沈洪伟
Owner GUANGXI LIUGONG MASCH CO LTD
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