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Hydraulic loop of building machinery

A technology for hydraulic circuits and construction machinery, which is applied in the field of hydraulic circuits and can solve problems such as the inability of pressure oil to be supplied.

Active Publication Date: 2008-12-24
NABLESCO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even when the amount of pressure oil used by the directional switching valve for the boom (the first directional switching valve) is sufficient, there is a disadvantage that the pressure oil from the third pump can hardly be supplied.

Method used

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  • Hydraulic loop of building machinery
  • Hydraulic loop of building machinery
  • Hydraulic loop of building machinery

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Experimental program
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Effect test

Embodiment Construction

[0023] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. figure 1 It is a figure which shows the hydraulic circuit of the construction machine which concerns on embodiment of this invention. The construction machine to which the hydraulic circuit 1 (hereinafter, referred to as the hydraulic circuit 1) of the construction machine is applied is a crawler vehicle equipped with various actuators such as a boom and a boom, and each hydraulic motor for driving these actuators is provided. or each pressure cylinder. And this construction machine is equipped with the 1st pump 11 (P1), the 2nd pump 12 (P2), and the 3rd pump 13 (P3), and the said 1st pump 11 (P1), the 2nd pump 12 (P2), and the 3rd pump 13 (P3) are provided. The three pumps 13 (P3) supply pressurized oil to the first to third systems provided in the hydraulic circuit 1, respectively.

[0024] like figure 1 As shown, the hydraulic circuit 1 is pro...

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Abstract

The hydraulic circuit of the construction machine of the present invention improves the working efficiency of the construction machine by efficiently combining the pressure oil from the third pump and supplying it to the first system and the second system. The first system is supplied from the first system. pump pressure oil, the second system is supplied with pressure oil from the second pump. The first confluent passage (38) can supply the pressure oil from the third pump (13) to the first unloading passage (31) of the first system. The second confluent passage (39) can supply the pressure oil from the third pump (13) to the second supply passage (34) of the second system. The discharge passage (40) forms a throttle valve and connects the first confluent passage (38) and the second confluent passage (39) with the fuel tank.

Description

technical field [0001] The present invention relates to a hydraulic circuit for a construction machine, comprising: a first system including a first direction switching valve supplied with pressure oil from a first pump; and a second system including a second system including pressure oil supplied from the second pump The second directional switching valve of the 3rd system includes a third directional switching valve to which pressure oil from the third pump is supplied. Background technique [0002] As a hydraulic circuit of a conventional construction machine, there is generally a first system including a first direction switching valve to which pressure oil from a first pump is supplied, and a second system including the second system Including: a second directional switching valve to which pressure oil from the second pump is supplied; and a third system including a third directional switching valve to which pressure oil from the third pump is supplied (refer to Patent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B11/16E02F9/22F15B11/02F15B11/17
CPCH04M1/0264H01R31/06H04N23/51
Inventor 井奥贤介濑川均
Owner NABLESCO CORP
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