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Hydraulic drive system of construction machine

A driving system and construction machinery technology, applied in mechanically driven excavators/dredgers, construction, mechanical equipment, etc., can solve problems such as insufficient working oil, and achieve the effect of suppressing unwarranted waste

Active Publication Date: 2016-06-01
KAWASAKI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the boom raising operation and other operations are performed at the same time, a large amount of hydraulic oil may flow into the hydraulic actuator with a low load pressure, and the hydraulic oil supplied to the boom cylinder may be insufficient.

Method used

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  • Hydraulic drive system of construction machine
  • Hydraulic drive system of construction machine
  • Hydraulic drive system of construction machine

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] (first embodiment)

[0035] figure 1 A hydraulic drive system 1A for a construction machine according to a first embodiment of the present invention is shown, figure 2 A construction machine 10 equipped with this hydraulic drive system 1A is shown. Other, figure 2 The construction machine 10 shown is a hydraulic excavator, but the present invention is applicable to any construction machine (for example, a hydraulic crane) as long as it includes a swing motor and a boom cylinder as hydraulic actuators.

[0036]Hydraulic drive system 1A includes figure 2 The shown bucket cylinder 15, arm cylinder 14 and boom cylinder 13 are used as hydraulic actuators, and also include a rotary motor 19 (only in figure 1 Shown in ) and a pair of left and right travel motors not shown in the figure. Further, the hydraulic drive system 1A includes a first hydraulic pump 11 and a second hydraulic pump 12 that supply hydraulic fluid to the above-mentioned hydraulic actuators. Other...

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PUM

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Abstract

This hydraulic drive system of a construction machine includes: a first hydraulic pump and second hydraulic pump that can, independently of each other, adjust a tilt angle; a turning control valve for controlling the supply of hydraulic fluid to a turning motor; and a boom primary control valve and boom secondary control valve that are for controlling the supply of hydraulic fluid to a boom cylinder. The turning control valve and the boom secondary control valve are disposed on a first bleed line, and the boom primary control valve is disposed on a second bleed line. Pilot pressure is output from a turning operation valve to the turning control valve, and pilot pressure is output from a boom operation valve to the boom primary control valve. When a turning operation and a boom raising operation are performed simultaneously, a boom lateral regulation valve does not output pilot pressure to the boom secondary control valve.

Description

technical field [0001] The invention relates to a hydraulic drive system of a construction machine. Background technique [0002] In construction machines such as hydraulic excavators or hydraulic cranes, various actions are performed by hydraulic drive systems. For example, Patent Document 1 discloses a method such as Figure 9 The hydraulic drive system 100 of the hydraulic excavator is shown. The hydraulic drive system 100 includes a rotary motor 110, an arm cylinder 120, a boom cylinder 130, a bucket cylinder 140, a reserve cylinder 150, a right travel motor 160, and a left travel motor 170 as Hydraulic actuator. Moreover, the hydraulic drive system 100 includes two hydraulic pumps (a first hydraulic pump and a second hydraulic pump) not shown in the figure for supplying hydraulic oil to the hydraulic actuators. [0003] On the first bleed line (bleedline) 101 extending from the first hydraulic pump, the swing control valve 111, the arm main control valve 121, the boo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/02E02F9/22F15B11/17
CPCF15B11/17E02F9/2242E02F9/2282E02F9/2285E02F9/2292E02F9/2296F15B2211/20576F15B2211/30565F15B2211/31582F15B2211/6316F15B2211/665F15B2211/7058F15B2211/7142F15B2211/782E02F9/2235F15B11/02E02F3/32E02F3/425E02F9/123E02F9/2228E02F9/2267F15B13/0401
Inventor 近藤哲弘伊藤诚藤山和人
Owner KAWASAKI HEAVY IND LTD