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Hydraulic control system for working machine

A technology for hydraulic control systems and working machines, which can be applied to fluid pressure actuation system components, mechanical equipment, earth movers/shovels, etc., and can solve problems such as wasted energy loss

Inactive Publication Date: 2009-05-20
CATEPILLAR SARL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the working part located above the ground has potential energy, and this potential energy is converted into thermal energy when passing through the orifice of the control valve, and the thermal energy is discharged to the atmosphere by the oil cooler, which becomes wasteful energy loss.

Method used

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  • Hydraulic control system for working machine
  • Hydraulic control system for working machine
  • Hydraulic control system for working machine

Examples

Experimental program
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Embodiment Construction

[0007] Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a hydraulic excavator as an example of a working machine. This hydraulic excavator 1 includes a crawler-type undercarriage 2, an upper swing body 3 rotatably supported above the undercarriage 2, and In parts such as the working part 4 in front of the upper turning body 3, the working part 4 further includes a boom (boom) 5 supported on the upper turning body 3 at a base end portion that is freely swingable up and down, and is supported on the front and rear swinging body freely. An arm (arm) 6 at the front end of the boom 5 , a bucket 7 attached to the front end of the arm 6 , and the like.

[0008] Reference numeral 8 is a pair of left and right boom cylinders (corresponding to hydraulic cylinders in the technical solution of the present invention) that perform telescopic motions to swing the above-mentioned boom 5 up and down. 8a (equivalent ...

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PUM

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Abstract

A hydraulic control system for a working machine, where potential energy of a working section that vertically moves is reliably recovered and reused and where an inconvenience such as reduction in the speed of the working section is avoided in reuse of the recovered potential energy. The hydraulic control system has a first main pump (9) for drawing oil from an oil tank (11) and discharging it, an accumulator for accumulating under pressure the oil discharged from a head side oil chamber (8a) of a boom cylinder (8) when the working section is lowered; and a hybrid pump (32) for drawing the oil accumulated under pressure in the accumulator. The hydraulic control system is constructed such that, when the a boom is lifted, oil discharged from the hybrid pump (32) is supplied to the head side oil chamber (8a) and, when the supply flow rate from the hybrid pump (32) is insufficient, the deficiency is supplied to the head side oil chamber (8a) from the first main pump (9).

Description

technical field [0001] The present invention belongs to the technical field of a hydraulic control system in a working machine that can recover and reuse potential energy of a working unit that has a working unit that moves up and down. Background technique [0002] Generally, work machines such as hydraulic excavators and cranes have a work unit that can be raised and lowered, and the work unit is raised and lowered based on the expansion and contraction of a hydraulic cylinder that is supplied with pressure oil from a hydraulic pump. When the working part is lowered, the oil discharged from the weight holding side oil chamber of the hydraulic cylinder to the oil tank is throttled by the control valve installed on the control valve that controls the oil supply and discharge of the hydraulic cylinder in order to prevent the sudden drop caused by the own weight of the working part. orifice for meter-out control. That is, the working part located above the ground has potentia...

Claims

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Application Information

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IPC IPC(8): F15B21/14E02F9/22
CPCE02F9/2285E02F9/2235E02F9/2292F15B2211/2654E02F9/2217F15B2201/51F15B21/14E02F9/2296E02F9/2242E02F9/2228F15B2211/20576E02F9/2203F15B2211/88F15B2211/212F15B2211/20546F15B2211/761
Inventor 和田笃志守屋直行J·盖伊权守克治
Owner CATEPILLAR SARL
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