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Hydraulic shovel

A technology of hydraulic excavators and hydraulic pumps, which is applied to mechanically driven excavators/dredgers, earth movers/shovels, mechanical equipment, etc., which can solve problems such as increased fuel consumption and deterioration of operating efficiency, and reduce Effects of hydraulic loss, improvement of work efficiency, and reduction of fuel consumption

Active Publication Date: 2021-04-02
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the hydraulic circuit described in Patent Document 1 configured in this way, even when the hydraulic oil flowing into the boom hydraulic cylinder is reduced by gradually reducing the boom raising operation during the horizontal pull-back operation, the throttle valve The flow rate of the hydraulic oil flowing from the bypass line (parallel line) to the arm cylinder is restricted, so there is concern about deterioration of work efficiency and increase in fuel consumption due to hydraulic loss in the throttle valve

Method used

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Examples

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Embodiment 1

[0029] Below, according to Figure 1 to Figure 8 The first embodiment of the present invention will be described.

[0030] figure 1 It is a side view showing the hydraulic excavator of this embodiment. figure 1 Among them, the hydraulic excavator 200 is composed of an undercarriage 2 and an upper revolving body 1 rotatably connected, and the upper revolving body 1 is equipped with a boom 3 , an arm 4 , a bucket 5 , and boom hydraulics for driving them. Cylinder 6, stick hydraulic cylinder 7, bucket hydraulic cylinder 8 and other hydraulic cylinders.

[0031] figure 2 is a hydraulic circuit diagram of the hydraulic excavator 200 . In this embodiment, a hydraulic circuit in a positive control mode is taken as an example for illustration. figure 2 Among them, variable displacement hydraulic pumps 9 and 10 are driven by an engine 11 . The first hydraulic pump 9 supplies hydraulic oil to the boom first direction switching valve 18 , the bucket direction switching valve 22 ,...

Embodiment 2

[0077] image 3 A hydraulic circuit of a hydraulic excavator 200 according to a second embodiment of the present invention is shown. Hereinafter, differences from the first embodiment will be described.

[0078] The operating pressure port 31 a of the center bypass flow control valve 31 is connected to the secondary pressure port of the electromagnetic proportional pressure reducing valve 32 via a pilot line 43 . The secondary pressure output from the electromagnetic proportional pressure reducing valve 32 acts on the operating pressure port 31 a of the center bypass flow control valve 31 . A discharge line 40 of the pilot pump 28 is connected to a primary pressure port of the electromagnetic proportional pressure reducing valve 32 , and hydraulic oil discharged from the pilot pump 28 is supplied. The secondary pressure output from the electromagnetic proportional pressure reducing valve 32 is controlled by the controller 100 . The controller 100 makes the opening character...

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Abstract

Provided is a hydraulic shovel that can improve work efficiency while limiting fuel consumption by way of reducing hydraulic loss when simultaneously operating a plurality of hydraulic actuators withdifferent loads. The hydraulic shovel comprises: a center bypass flow rate control valve that is disposed the furthest downstream in a center bypass line and that restricts, according to an operationamount for a second operation device when the second operation device is operated, the flow rate of pressurized oil passing through the center bypass line; and a spool stroke limiting device that limits, according to an operation amount for a first operation device, the spool stroke amount for a second directional switching valve while in a state in which the spool stroke amount for a third directional switching valve is controlled according to the operation amount for the second operation device in a case in which the first operation device and the second operation device are simultaneously operated.

Description

technical field [0001] The present invention relates to hydraulic excavators. Background technique [0002] The hydraulic excavator is equipped with multiple hydraulic actuators such as booms, sticks, buckets, and boom hydraulic cylinders, stick hydraulic cylinders, and bucket hydraulic cylinders that drive them. Generally, the number of hydraulic pumps that discharge the hydraulic oil that drives the hydraulic actuators is smaller than that of the hydraulic actuators. Therefore, when multiple hydraulic actuators are operated simultaneously, it is necessary to discharge the hydraulic oil from one hydraulic pump to multiple hydraulic actuators. Institutions are allocated appropriately. Patent Documents 1 and 2 exist, for example, as conventional technologies disclosing such a hydraulic excavator. [0003] In the hydraulic circuit described in Patent Document 1, a throttle valve is provided in front of the first arm directional switching valve (arm second directional switchi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22F15B11/00F15B11/042F15B11/08
CPCF15B11/17F15B2211/20546F15B2211/20576F15B2211/329F15B2211/36F15B2211/6316F15B2211/3116F15B2211/45F15B2211/7128F15B2211/355F15B2211/327F15B2211/85F15B2211/88F15B2211/6355F15B2211/6654F15B11/166F15B2211/30565F15B2211/7142E02F9/2285E02F9/2292E02F9/2296E02F9/2282E02F9/2203E02F9/2228E02F9/2242E02F9/22F15B11/042F15B11/08E02F3/32E02F3/425E02F9/2004E02F9/2267E02F9/2271F15B15/204
Inventor 小仓康平小高克明茅根征勋白川贺裕
Owner NIHON KENKI CO LTD