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.
CN1427185AInactive Publication Date: 2003-07-02SAMSUNG HEAVY IND CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
SAMSUNG HEAVY IND CO LTD
Publication Date
2003-07-02
Estimated Expiration
Not applicable ยท inactive patent

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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.
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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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