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Hydraulic changeable controller for heavy construction equipment

A technology for a control device and construction equipment, which is applied to fluid pressure actuating devices, mechanical equipment, earth movers/shovels, etc., can solve the problems of the auxiliary control valve 400 not providing inspection functions, increasing costs, adding parts, etc.

Inactive Publication Date: 2003-07-02
SAMSUNG HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the hydraulic control device as described above requires an additional section to install the auxiliary hydraulic control valve 400 in the hydraulic passage between the load passages 6A and 6B of the reversing valve 100 and the hydraulic cylinder 300, causing some problems due to the increased The number of parts thus increases the cost and cannot be used in places where space is tight due to layout interference during design
[0009] In addition, the auxiliary control valve 400 does not provide a verification function. It is used to prevent backflow when the load pressure on the side of the hydraulic cylinder 300 is higher than the discharge pressure on the side of the hydraulic pump 200 . An additional non-return valve 3 is installed in the pump passage 5

Method used

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  • Hydraulic changeable controller for heavy construction equipment
  • Hydraulic changeable controller for heavy construction equipment
  • Hydraulic changeable controller for heavy construction equipment

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Embodiment Construction

[0025] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, and these detailed descriptions can easily implement the present invention for those skilled in the art, but do not limit the technical scope and spirit of the present invention.

[0026] figure 2 , Figure 3a , Figure 3b with Figure 3c is a sectional view of a seat valve body according to an embodiment of the present invention, Figure 4 A hydraulic circuit using this seat valve body is shown.

[0027] Referring to the accompanying drawings, a seat valve body 500 according to the present invention is provided with a first seat valve 502 installed in the pump passage 5 and hydraulic feeders 7A and 7B to control the degree of opening, and a second seat valve 501 that controls the first The growth amount of the seat valve, and an indicating scroll 41 , provide indicating pressure fluid for the pressure chamber 524 of the second se...

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PUM

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Abstract

Hydraulic changeable controller for heavy construction equipment is disclosed. A seat valve element provided in an oil passage between a pump path and a feeder path for controlling the amount of oil to be supplied to a variable throttle and auxiliarily controlling the amount of oil flowing into a load path comprises a first seat valve having a control variable throttle to be displaced with a difference between the loading pressure of the load path and pressure on the discharge side of a hydraulic pump for changing an opening area ranging from the pump path to the feeder path with the displacement, a second seat valve having a pilot control variable throttle to be displaced with respective to the first seat valve for determining the displacement of the first seat valve and changing the opening area with the displacement, and a pilot spool having a pilot variable throttle for determining the displacement of the pilot control variable throttle of the second seat valve during change-over.

Description

technical field [0001] The present invention relates to a hydraulically variable control device for heavy construction equipment that variably controls the supply of hydraulic fluid to a transmission. [0002] More particularly, the present invention relates to a hydraulic variable control device having internally a reversing valve, an auxiliary hydraulic control valve to control the flow of hydraulic fluid into and out of a hydraulic cylinder to reduce the number of components to reduce cost, and because it The compact structure can be used in a narrow space and prevents the layout from being interfered in the design, and can be used in a narrow space. Background technique [0003] As schematically shown in FIG. 1 , a conventional hydraulic control device for heavy construction equipment is provided with a hydraulic pump 200 connected to an engine, a hydraulic cylinder 300 connected to the hydraulic pump 200 and driven by supplied hydraulic fluid, a reversing valve 100 Ins...

Claims

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Application Information

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IPC IPC(8): F15B11/05E02F9/22F15B11/08F15B13/04
CPCE02F9/2267E02F9/2225E02F9/2271F15B13/0417
Inventor 具本昔
Owner SAMSUNG HEAVY IND CO LTD
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