KR101512956B1 - combination structure of pilot pressure conversion valve - Google Patents

combination structure of pilot pressure conversion valve Download PDF

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Publication number
KR101512956B1
KR101512956B1 KR1020140048577A KR20140048577A KR101512956B1 KR 101512956 B1 KR101512956 B1 KR 101512956B1 KR 1020140048577 A KR1020140048577 A KR 1020140048577A KR 20140048577 A KR20140048577 A KR 20140048577A KR 101512956 B1 KR101512956 B1 KR 101512956B1
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KR
South Korea
Prior art keywords
spool
head
spring seat
spring
curved
Prior art date
Application number
KR1020140048577A
Other languages
Korean (ko)
Inventor
김만용
Original Assignee
주식회사 상아정공
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Publication date
Application filed by 주식회사 상아정공 filed Critical 주식회사 상아정공
Priority to KR1020140048577A priority Critical patent/KR101512956B1/en
Application granted granted Critical
Publication of KR101512956B1 publication Critical patent/KR101512956B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/04—Construction of housing; Use of materials therefor of sliding valves
    • F16K27/041—Construction of housing; Use of materials therefor of sliding valves cylindrical slide valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/30—Details
    • F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanically-Actuated Valves (AREA)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spool fastening structure of a pilot pressure switching valve for opening and closing a passage while slidably moving in a valve body.
The present invention provides a spool fastening structure of a joystick pilot pressure switching valve for mounting a spool inside a valve body so as to be able to slide upward and downward according to an angular displacement of a lever cam connected to a joystick to control pilot fluid flow, A return spring and a balance spring for returning the spring sheet descended by the pressing force from the lower side of the spring seat to the initial position by elasticity when assembled, And a spool having a spool head, a spool body for receiving the return spring and the balance spring, and a spool having a flow path switching part that is slidably moved up and down together with the spring seat on the fluid path, , The spool head Wherein the spring seat is formed with a head through hole formed by a linear portion and a curved portion corresponding to the facing surface and the curved surface of the spool head so that the spool head inserted into the head through- The bottom of the curved surface of the spool head is engaged. According to the present invention, there is an advantage that the spool head is more easily and accurately fastened and the work efficiency is improved.

Description

[0001] The present invention relates to a pilot pressure conversion valve,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spool fastening structure of a pilot pressure switching valve for opening and closing a passage while slidably moving in a valve body.

In general, the pilot pressure switching valve is a valve that controls the high-pressure oil supplied to the piston and the cylinder according to the external pressure in a hydraulic pressure servo mechanism. It is a device that performs a role.

The pilot pressure switching valve is connected to a joystick for controlling a work unit such as a boom or a bucket of a heavy construction equipment. The pilot pressure switching valve is connected to the joystick for driving a work unit in response to a pilot signal generated by operating a spool Actuate the actuator.

To this end, the pilot pressure switching valve selectively presses the push rod by a pushing action of the lever cam according to the operation of the joystick, and opens and closes the flow path inside the valve body while sliding the spool by the push rod, Flow.

On the other hand, in the prior art, after the spool for opening and closing the flow path passes through the spring seat as described above, it is fixed by a separate fixing ring.

Therefore, in the above-described fixing structure, since the fixing ring must be inserted while maintaining the pressing state of the spring seat, the fastening is not easy and the working efficiency is lowered.

On the other hand, Japanese Patent Laid-Open Publication No. 1995-55047 discloses a spool support structure of a pilot valve.

FIG. 1 is a view showing an internal structure of a pilot pressure switching valve according to the prior art, and FIG. 2 is a view showing an embodiment of a spring seat for fixing a spool of a pilot pressure switching valve according to the prior art.

Referring to these drawings, in the prior art, the lever cam 2 is connected to the joystick 3 which the user grips and manipulates so that the operating force is transmitted in the vertical direction, and the push rod 4 are provided.

A spool 20 slidable upward and downward is mounted on the underside of the push rod 4. A spring seat 40 lowered by a pressing force at the lower side of the spring seat 40 during assembly is fixed to an initial position A return spring 60 and a balance spring 30 are provided.

The spool (20) controls the flow of the fluid moving to the pump pressure chamber (5) and the tank pressure chamber (7).

The spool 20 is fixed by the U-shaped holding ring 13 as shown in FIG. 2 in a state where the spool head 50 passes through the spring seat 40, Is elastically supported by the return spring (60) and the balance spring (30).

In the prior art, in a state in which the spool head 50 penetrates the spring seat 40, the boundary portion between the spool head 50 and the spool body is pushed into the notch 13a formed in the U-shaped retaining ring 13 Respectively.

According to another embodiment of the related art, a relatively large-diameter attachment / detachment hole 13b and a relatively small-diameter attachment hole 13c are formed to be connected to each other. The spool head 50 is inserted into the attachment / 13b while pushing the spool head 50 into the mounting hole 13c.

However, in the above-described conventional art, the spool head 50 is inserted into a predetermined position in the process of assembling and disassembling the spool 20, and the spool head 50 is fixed by simply moving to the mounting position communicated with the spool head.

Therefore, if it is unclear whether the spool head 50 has been moved to the correct mounting position during the mounting process, and the assembling of the pilot pressure switching valve is completed in a state where the spool head 50 is not moved to the required mounting position, The spool head 50 can be detached from the mounting position in repeated upward and downward movement of the spool 20 during the use of the valve.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a spool fastening structure for a pilot pressure switching valve that allows a mounting state of a spool head to be more clearly confirmed while a mounting state thereof can be firmly maintained.

It is another object of the present invention to provide a spool fastening structure of a pilot pressure switching valve in which the fastening can be made easier by allowing the spool head to be rotationally fastened to the spring seat.

The present invention provides a spool fastening structure of a joystick pilot pressure switching valve for mounting a spool inside a valve body so as to be able to slide upward and downward according to an angular displacement of a lever cam connected to a joystick to control pilot fluid flow, A return spring and a balance spring for returning the spring sheet descended by the pressing force from the lower side of the spring seat to the initial position by elasticity when assembled, And a spool having a spool head, a spool body for receiving the return spring and the balance spring, and a spool having a flow path switching part that is slidably moved up and down together with the spring seat on the fluid path, , The spool head Wherein the spring seat is formed with a head through hole formed by a linear portion and a curved portion corresponding to the facing surface and the curved surface of the spool head so that the spool head inserted into the head through- And the bottom of the curved surface of the spool head is engaged and fixed.

And the center of the head through hole is formed to be eccentric from the center of the spring seat so that a curved portion of one side is positioned adjacent to the center of the spring seat.

The spool head is rotatably engaged with a curved portion of a spring seat positioned adjacent to the center of the spring seat to form a concentricity with the spring seat.

The spool head is characterized in that two facing surfaces are formed opposite to each other and two curved surfaces are formed facing each other.

The present invention provides a fastening structure in which a spool head is rotationally coupled and concentric with a spring seat. Therefore, since the fastening completion position can be clearly confirmed, there is an advantage that the product failure due to the assembly failure can be prevented.

In the present invention, the spool head is formed to include the curved surface and the facing surface, and the insertion position is clearly distinguished from the circular spool head used in the prior art by forming a slot having a shape corresponding to the spool head in the spring seat. Further, since the insert is rotated without being moved horizontally after the insertion, it is advantageous that the fastening can be performed more easily.

1 and 2 are views showing a spool fastening structure of a pilot pressure switching valve according to the prior art.
Figs. 3 to 5 are diagrams for illustrating a fastening relationship between recesses of the present invention; Fig.
6 is a view showing a detailed structure of a spring seat which is a main constituent of the present invention.
7 and 8 are views showing a process of fastening a spool head to a spring seat which is a main constituent of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. It is to be understood, however, that the spirit of the invention is not limited to the embodiments shown and that those skilled in the art, upon reading and understanding the spirit of the invention, may easily suggest other embodiments within the scope of the same concept.

Figs. 3 to 5 show views for showing the engagement relationship between the essential parts of the present invention. Fig. 6 is a view showing a detailed structure of a spring seat which is a main constituent of the present invention.

Referring to these drawings, the spool 100 is mounted vertically and movably by a spring seat 300, a return spring (not shown) and a balance spring 200, and the pilot pressure switching valve The spool 100 is configured to be rotatably coupled to the spring seat 300.

The spool 100 includes a spool body 140, a spool head 120 formed at an upper end of the spool body 140, and a flow path switching unit 160 for switching a flow path of the fluid according to a moving position And is inserted into the head through hole 340 formed in the spring seat 300.

For this purpose, the spool head 120 and the head through-hole 340 are formed to correspond to each other.

In detail, the spool head 120 is formed to include a curved surface 122 and a facing surface 124 at the upper end of the spool body 140 formed in a cylindrical shape.

That is, in the present invention, the spool head 120 is not formed in a circular shape as in the prior art but is formed to have at least one facing surface 124.

The spool head 120 can be inserted into the head through hole 340 at a predetermined position by forming the head through hole 340 in a shape corresponding to the spring seat 300. [

Referring to FIG. 4, in the present embodiment, the spool head 120 is formed to have two curved surfaces 122 and two facing surfaces 124.

The spring seat 300 has a head fixing portion 320 for fixing the spool head 120 to the seat body 310 having a predetermined thickness.

In detail, the head fixing portion 320 forms an upper surface of the seat body 310.

A head through hole 340 having a shape corresponding to the spool head 120 is formed in the head fixing part 320.

5, a spring receiving portion 360 is formed at a lower portion of the seat body 310 to receive a portion of the upper end of the balance spring 200 and maintain a stable mounting position. Although not shown, a return spring (not shown) provided outside the balance spring 200 also receives a portion of the upper end of the spring receiving portion 360.

In addition, a spool washer 220 is further provided at the lower end of the balance spring 200 to improve the fastening force of the spool body 140 and the balance spring 200.

A straight portion 342 is formed in the head through hole 340 at a portion corresponding to the facing surface 124 and a curved portion 344 is formed at a portion corresponding to the curved surface 122.

The head through hole 340 is positioned eccentrically from the center of the head fixing portion 320 so that the spool head 120 is rotated with respect to a curved portion at a position close to the center of the spring seat 300 So that the concentricity of the spool head 120 and the spring seat 300 can be easily adjusted.

7 and 8 show a process for fastening the spool head to the spring seat, which is a main constituent of the present invention, for the sake of detailed explanation.

Referring to these figures, in the spool fastening structure of the pilot pressure switching valve according to the present invention, the straight surface portion 342 of the head through hole 340 corresponds to the facing surface 124 of the spool head 120, The spool head 120 is inserted so that the curved surface 122 corresponds to the portion 344.

When the spool head 120 is inserted as described above, the spool head 120 is rotated. At this time, as shown in the drawing, the spool head 120 rotates while being in contact with the curved portion 344 close to the center do.

Therefore, the spool head 120, which has been rotated, is concentric with the spring seat 300, so that the spool head 120 is easily fastened, and the fastened state can be intuitively confirmed.

In addition, since the fastened spool head 120 can be firmly fastened to the linear portion 342 of the spring seat 300 with the curved surface 122 formed thereon, The fastening position can be maintained.

100 ..... Spool 120 ..... Spool head
122 ..... surface 124 ..... facing
200 ..... Balance spring 300 ..... Spring seat
310 ..... Seat body 320 ..... Head fixing part
340 ..... head through hole 342 ..... straight line part
344 ..... curved portion

Claims (4)

A spool fastening structure of a joystick pilot pressure switching valve for controlling a pilot fluid flow by mounting a spool inside a valve body so as to be slidable upward and downward in accordance with an angular displacement of a lever cam connected to a joystick,
A spring seat that moves up and down by a pressing force on the movement path of the pilot fluid;
A return spring and a balance spring for returning the spring sheet lowered by a pressing force from the lower side of the spring seat during assembly to an initial position by elasticity; And
A spool body which is coupled to the spring seat, a spool body which receives the return spring and the balance spring, and a flow path switching part which slides up and down together with the spring seat on the flow path of the fluid, And a spool,
Wherein the spool head is formed to include a facing surface and a curved surface, wherein the spring seat is formed with a head through hole formed by a linear portion and a curved portion corresponding to a facing surface and a curved surface of the spool head, And the bottom of the curved surface of the spool head is engaged and fixed to the linear portion while the spool head is rotated.
The method according to claim 1,
And the center of the head through hole is formed eccentrically from the center of the spring seat so that a curved portion of one of the curved portions is located adjacent to the center of the spring seat.
3. The method of claim 2,
Wherein the spool head is rotatably engaged with a curved portion of a spring seat positioned adjacent to a center of the spring seat to form a concentricity with the spring seat.
The method according to claim 1,
Wherein the spool head is formed with two facing surfaces facing each other and two curved surfaces facing each other.
KR1020140048577A 2014-04-23 2014-04-23 combination structure of pilot pressure conversion valve KR101512956B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020140048577A KR101512956B1 (en) 2014-04-23 2014-04-23 combination structure of pilot pressure conversion valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140048577A KR101512956B1 (en) 2014-04-23 2014-04-23 combination structure of pilot pressure conversion valve

Publications (1)

Publication Number Publication Date
KR101512956B1 true KR101512956B1 (en) 2015-04-17

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KR1020140048577A KR101512956B1 (en) 2014-04-23 2014-04-23 combination structure of pilot pressure conversion valve

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07279907A (en) * 1994-04-07 1995-10-27 Hitachi Constr Mach Co Ltd Pressure reducing valve type pilot valve
JPH0749167Y2 (en) * 1990-06-27 1995-11-13 株式会社小松製作所 Pilot valve
JP2007107696A (en) * 2005-10-17 2007-04-26 Komatsu Ltd Pilot valve with lever position detecting function
JP5449206B2 (en) * 2009-02-05 2014-03-19 日立建機株式会社 Pilot valve device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0749167Y2 (en) * 1990-06-27 1995-11-13 株式会社小松製作所 Pilot valve
JPH07279907A (en) * 1994-04-07 1995-10-27 Hitachi Constr Mach Co Ltd Pressure reducing valve type pilot valve
JP2007107696A (en) * 2005-10-17 2007-04-26 Komatsu Ltd Pilot valve with lever position detecting function
JP5449206B2 (en) * 2009-02-05 2014-03-19 日立建機株式会社 Pilot valve device

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