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Hydraulic circuit for construction equipment

A hydraulic circuit and hydraulic cylinder technology, which is applied in the field of hydraulic circuit systems and hydraulic cylinders, can solve problems such as hydraulic fluid backflow and pressure loss, and achieve the effects of preventing pressure loss and improving reliability

Inactive Publication Date: 2017-05-24
VOLVO CONSTR EQUIP AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, since the hydraulic fluid from the hydraulic pump 1 is introduced into the meter-in port of the directional control valve 3 through the flow control valve 8, an undesired pressure loss is caused
[0024] Furthermore, when the hydraulic cylinder 2 is driven to extend to raise the boom, when the hydraulic cylinder 2 is subjected to a load pressure higher than the hydraulic pressure of the hydraulic fluid supplied by the hydraulic pump 1, a reverse flow of hydraulic fluid may occur
That is, the load check function that uses the flow control valve 8 to prevent reverse flow so that the hydraulic cylinder 2 is not driven to retract cannot be properly performed, which is problematic

Method used

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  • Hydraulic circuit for construction equipment
  • Hydraulic circuit for construction equipment
  • Hydraulic circuit for construction equipment

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Embodiment Construction

[0082] Hereinafter, a hydraulic circuit system for construction equipment according to an exemplary embodiment of the present disclosure will be described in detail with reference to the accompanying drawings.

[0083] figure 2 is a diagram of a hydraulic circuit system for construction equipment according to an exemplary embodiment, wherein the large chamber supplies hydraulic fluid to the small chamber to perform hydraulic fluid regeneration when the hydraulic cylinder is driven to retract; image 3 is a diagram of a hydraulic circuit system for construction equipment in which a hydraulic pump supplies hydraulic fluid to a small chamber to perform a lifting operation when the hydraulic cylinder is driven to retract; Figure 4 is a diagram of a hydraulic circuit system for construction equipment according to another embodiment, wherein the large chamber supplies hydraulic fluid to the small chamber to perform hydraulic fluid regeneration when the hydraulic cylinder is driven...

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Abstract

Disclosed is a hydraulic circuit for construction equipment for controlling to selectively supply a hydraulic oil from a hydraulic pump to a hydraulic cylinder for driving a boom. The hydraulic circuit for construction equipment, according to the present invention, comprises: a hydraulic cylinder driven by a hydraulic oil of a hydraulic pump; a direction control valve installed on the oil passage between the hydraulic pump and the hydraulic cylinder; an operating device installed on the oil passage between a pilot pump and the direction control valve; a center by-pass switching valve installed at the most downstream side of a center by-pass passage of the hydraulic pump; a pressure detection sensor that detects the pressure of a hydraulic oil at the large chamber side of the hydraulic cylinder; a jack-up switching valve installed on the oil passage between the operating device and the center by-pass switching valve; and a flow control valve installed in the spool of the direction control valve.

Description

technical field [0001] The present disclosure relates to construction equipment, and more particularly, to a hydraulic circuit system for construction equipment that controls the selective supply of hydraulic fluid to a hydraulic cylinder that drives a boom through a hydraulic pump. Background technique [0002] figure 1 is a diagram of a conventional hydraulic circuit for construction equipment. [0003] Such as figure 1 As shown, a hydraulic cylinder 2 is connected to a variable displacement hydraulic pump (hereinafter referred to as a hydraulic pump) 1 such that the hydraulic cylinder 2 is driven by hydraulic fluid supplied by the variable displacement hydraulic pump 1 . A directional control valve (MCV) 3 is provided on a path between the hydraulic pump 1 and the hydraulic cylinder 2 to control the flow of hydraulic fluid supplied to and discharged from the hydraulic cylinder 2 . [0004] The control device 4 is provided on a path between the pilot pump 5 and the dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/20E02F9/22
CPCE02F9/2282E02F9/2296E02F9/2228E02F9/2217E02F3/435E02F9/2235E02F9/20E02F9/22E02F9/2267E02F9/2271E02F9/2285E02F9/2292F15B11/10F15B13/027F15B21/14F15B2211/20546F15B2211/41554F15B2211/428F15B2211/6052F15B2211/6313F15B2211/6346F15B2211/6355F15B2211/7053
Inventor 郑海均
Owner VOLVO CONSTR EQUIP AB
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