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Hydraulic shovel

A technology for hydraulic excavators and hydraulic pumps, which is applied to earth moving machines/shovels, mechanical equipment, fluid pressure actuators, etc., and can solve the problem of poor initial response of hydraulic excavators, inability to ensure necessary hydraulic pressure, and failure to perform Problems such as component work, to achieve the effect of good start-up, simple structure, and high degree of design freedom

Inactive Publication Date: 2008-02-13
KOMATSU LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to remove this air, the hydraulic circuit must be activated to circulate the working oil in the hydraulic circuit, and the operation takes time
In addition, during this period, due to the air mixed in the working oil, the necessary hydraulic pressure cannot be ensured when the actuator is working, and the actuator cannot be operated.
Furthermore, the initial responsiveness of the hydraulic excavator deteriorates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0034] FIG. 1 shows an overall view of a hydraulic excavator 1 according to a first embodiment of the present invention. In FIG. 1 , a hydraulic excavator 1 includes: a running body 2 ; a rotatable swing body 3 arranged above the running body 2 ; and a working machine 4 mounted in front of the swing body 3 .

[0035] Although the running body 2 adopts a crawler-type running body equipped with crawlers in this embodiment, it is not limited to this, and for example, a wheel-type running body equipped with tires or another suitable type of running body may be used. A bulldozer 21 is provided in front of the traveling body 2 .

[0036] A driver's seat 32 is provided above the revolving body 3 , and the operation of the working machine 4 , the rotating motion of the revolving body 3 , and the left and right running motion of the traveling body 2 can be operated through the working machine control lever 33 and the traveling control lever 34 . In addition, a hydraulic circuit 5 (see...

no. 2 approach

[0062] Next, a second embodiment of the present invention will be described. The structure of the second embodiment is the same as that of the first embodiment except that the installation position of the pipeline with a throttle valve 7 is different from that of the first embodiment.

[0063] FIG. 5 is a diagram showing a hydraulic circuit 5 of a hydraulic excavator 1 according to a second embodiment of the present invention. In this FIG. 5 , the line 7 with a throttle valve is provided on the line 91 near the control valve 54 downstream of the unloading valve 55 (ie, between the unloading valve 55 and the control valve 54 ).

[0064] In such a second embodiment, when air is mixed between hydraulic oil tank 51 and hydraulic pump 52 , when hydraulic pump 52 operates, air is discharged from main pump 521 to hydraulic oil tank 51 through throttle line 7 . Since the pipeline 7 with a throttle valve is provided on the side of the main pump 521 whose flow rate is larger than that ...

no. 3 approach

[0067] Next, a third embodiment of the present invention will be described. The third embodiment differs from the first embodiment in that the line with a switching valve 8 is provided instead of the line with a throttle valve 7 , but the structure is the same as that of the first embodiment.

[0068]FIG. 6 is a diagram showing a hydraulic circuit 5 of a hydraulic excavator 1 according to a third embodiment of the present invention. In this FIG. 6 , in the pipeline 93 , in the vicinity of the PPC valve 61 downstream of the safety valve 62 (that is, between the safety valve 62 and the PPC valve 61 ), a pipeline 81 communicating the pipeline 93 with the working oil tank 51 is provided. , and a switching valve 82 that is provided in the middle of the pipeline 81 and can open and close the flow path of the pipeline 81 . The switching valve 82 can be manually switched by an operator at the driver's seat 32 . Furthermore, these piping 81 and switching valve 82 are provided, and th...

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Abstract

A hydraulic shovel, wherein a pipeline (71) allowing a pipeline (93) to communicate with a hydraulic tank (51) is installed in the pipeline (93). A restrictor (72) is installed in the pipeline (71) to form a restricted pipeline (7). If air is trapped between the hydraulic tank (51) and a hydraulic pump (52), the hydraulic pump (52) is driven to discharge the air from the restricted pipeline (7) to the hydraulic tank (51) to remove the air from the inside of a hydraulic circuit (5). Since a resistance by the restrictor (72) is increased when the air is removed, a hydraulic oil flows from a pilot pump (522) to a PPC valve (61). Since the air can be bled by a simple structure such as the restricted pipeline (7), the hydraulic oil from which the air is removed is supplied into a hydraulic cylinder (44) from the start. As a result, the responsiveness of the hydraulic cylinder (44) can be improved.

Description

technical field [0001] The present invention relates to hydraulic excavators. Background technique [0002] The hydraulic excavator includes a bucket cylinder, a boom cylinder, a boom cylinder, and the like for separately operating a bucket, a boom, and a boom. These cylinders are driven by a hydraulic circuit (for example, refer to Patent Document 1). The hydraulic circuit includes: a working oil tank that stores working oil; a working oil pump that supplies working oil from the working oil tank to each working cylinder; each working cylinder that is hydraulically driven by working oil from the working oil pump; and a switch that switches supply of working oil to each of these working cylinders. Control valve. The working oil in the working oil tank is supplied to each working cylinder by the working oil pump through the control valve to make each working cylinder work. [0003] In such a hydraulic excavator, especially a small hydraulic excavator, in order to increase t...

Claims

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Application Information

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IPC IPC(8): F15B21/04E02F9/00E02F9/24F15B21/044
CPCF15B2211/40507F15B2211/611F15B2211/41563F15B2211/3111F15B2211/423F15B2211/635F15B2211/655F15B21/044E02F9/226F15B2211/851F15B2211/6355F15B21/04E02F9/00E02F9/24
Inventor 伊东进一
Owner KOMATSU LTD
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