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Sliding valve device

A slide valve device and slide valve technology, applied in the direction of valve devices, slide valves, fluid pressure actuation devices, etc., can solve the problems that the device cannot be small, lightweight, and long in overall length

Inactive Publication Date: 2008-01-02
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Therefore, the spool valve device of the type that prevents the rotation of the spool valve (rotation stop) is compared with the type of spool valve device that does not stop the rotation. lightweight problem

Method used

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Embodiment Construction

[0039] Hereinafter, a case where the spool valve device according to the embodiment of the present invention is applied to a directional control valve for a hydraulic cylinder will be described in detail with reference to the drawings.

[0040] Here, FIGS. 1 to 10 show the first embodiment of the present invention. In the figure, reference numeral 1 is a hydraulic pump constituting a hydraulic source together with an oil tank 2. The hydraulic pump 1 is rotationally driven by, for example, a prime mover (not shown) of a hydraulic excavator, and uses working oil sucked from the oil tank 2 as a high-pressure pressure. The oil is output into the pump line 3. In addition, the pressure oil output into the pump pipe 3 is supplied to the hydraulic cylinder 5 and the like through the directional control valve 11 described later, and the oil returned from the hydraulic cylinder 5 is returned to the tank 2 through the tank pipe 4 from the directional control valve 11 side. discharge.

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PUM

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Abstract

The slide valve gear of the invention not only can keep the slide valve to the rotation stopping state, but also can shorten the total length dimension to realize the miniaturization and the weight-lightning of the device. a rotating preventing mechanism (35) which is composed of a movable guiding piece (36) and the like components is arranged between the projected axle part (25) arranged at the side of the slide valve (21) and the cover body (27A) thereby restraining the rotating of the slide valve (21) in the slide valve sliding hole (13). At this occasion the movable guiding element (36) which is embed and arranged in the cover body (27A) with a rotating stopping state moves in the axial direction following the sliding displacement of the slide valve (21), at the same time the guiding hole (36B) arranged at the inner circumference side of the movable guiding element (36) uses the spring (37) to be kept with the state that it is inserted in the projecting axle part (25) of the slide valve (21). Besides, the device is made into the structure that it uses the spring (37) to allow the relative displacement of the relative projecting axle part (25) of the movable guiding element (36) and is kept for an anti-sliding state.

Description

technical field [0001] The present invention relates to a spool valve device that is installed on a construction machine such as a hydraulic excavator and is suitably used as a directional control valve, a pressure control valve, or a flow control valve. Background technique [0002] Generally speaking, in construction machinery such as hydraulic excavators, in order to supply and discharge pressure oil from a hydraulic source such as a hydraulic pump to a hydraulic driver (such as a hydraulic motor, hydraulic cylinder, etc.), it is made between the hydraulic driver and the hydraulic source. A structure in which a spool device such as a directional control valve is installed. [0003] And, the spool valve device according to this prior art includes: a valve casing provided with a spool valve sliding hole and a plurality of oil passages communicating with the spool valve sliding hole; In the sliding hole of the spool valve and connected or disconnected between the above-ment...

Claims

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Application Information

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IPC IPC(8): F15B13/02F16K3/22
CPCF16K3/24F16K3/314F16K11/07F16K27/041
Inventor 东崎光久松崎浩上野胜美
Owner NIHON KENKI CO LTD