KR20190016784A - Oil pressure adjustment valve with improved neutral state return damping - Google Patents

Abstract

The present invention provides an oil pressure adjustment valve with a neutral state return damping function. The oil pressure adjustment valve includes: a valve body (3) which is provided with a working fluid chamber (6) and at least one port (7) in the interior thereof; a plurality of spools (8) which is inserted into the valve body (3) through the port (7) and the working fluid chamber (6) and adjusts flows of the working fluid; a plurality of spool holes (9) which is provided in the interior of the valve body (3) so that the spool (8) is guided reciprocally in the longitudinal direction and is communicated with or connected to or interrupted from the working fluid chamber (6) by the longitudinal reciprocation of the spool (8); a pushing cam (10) which is connected to an upper side of the valve body (3) by a medium of a joint and seesaws based on the joint; a push rod (5) which presses the spool (8) while being pressed by the pushing cam (10); a damping chamber (18) which is formed between an outer peripheral surface of the push rod (5) and the valve body (3); a piston (22) coupled to the push rod (5) so that the damping chamber (18) is divided into a first damping chamber (18A) and a second damping chamber (18B); a valve mounting hole (112) which is formed in a core body part (130) in the interior of the valve body (3) to communicate with the plurality of spool holes (9); and a check valve (110) which is installed in a valve mounting hole (112). Accordingly, malfunction of the push cam can be prevented.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydraulic pressure regulating valve having a neutral return damping function,

The present invention has a novel neutral return damping function which prevents the push cam from being overturned to the opposite side due to the excessive elastic force of the spring when the push rod is pressed and returned to the neutral position, To a hydraulic control valve.

Generally, a pilot valve (hydraulic control valve) operated by a joystick is widely used in heavy construction equipment such as an excavator or a rod, and the spool is operated according to the operation of the driver's pedal to enable the running in response to the pilot signal pressure The actuator for driving the hydraulic motor is operated. In the case of the hydraulic control valve, when the lever is operated to apply a downward force to the push rod and a downward force is generated on the push rod, when the spool is pushed down by the push rod to open, When the hydraulic oil is discharged and the hydraulic oil is discharged to the port, for example, the left and right tracks of the excavator are rotated in the forward or reverse direction, or only one of the left and right tracks is driven so as to be able to steer in the drive track direction . 1 and 2 are photographs showing a track and a wheel employing a hydraulic pressure control valve.

The conventional hydraulic control valve is arranged such that a lever pedal operated by a worker or a foot is connected to the valve body by a joint and a plurality of push rods are projected from the upper side of the valve body so that the pushing cam selectively urges the push rods So that the spool connected to the lower end of the push rod is vertically moved in the spool hole.

The valve body is formed with a working oil chamber, pressure oil is returned to the tank through the return port formed at the center portion, and pressure oil (working oil) supplied from the external hydraulic pump and actuator to the operating oil chamber is discharged to each port of the valve body, And acts as a signal pressure. In other words, the valve body is provided with a plurality of (usually two) ports, a valve body is provided with a port connected to an external hydraulic pump and an actuator, and a hydraulic oil chamber connected to an external hydraulic oil tank And the operating oil chamber has a structure in which it is communicated with or disconnected from the port in accordance with the operation of the spool provided in each port so that the pushing cam is seesawed by the mechanical operating means operated by the operator, When the spool is lowered, the hydraulic fluid in the hydraulic oil chamber is supplied to the port where the spool is pressed, and the actuator signal pressure of the working machine such as an excavator acts on the hydraulic oil chamber while the hydraulic oil chamber communicates with the port on the spool side. And the spool is caused to return upward by a spring. That is, the hydraulic control valve prevents the working machine (the track of the excavator) from operating due to the flow path between each port and the hydraulic oil chamber being blocked by the spool. In this state, When the flow path between the port and the hydraulic oil chamber is opened, the signal pressure (hydraulic pressure) through the port communicated with the hydraulic oil chamber is supplied to the actuator, for example, the boom of the rod is expanded or the track of the excavator is operated. When the spool is returned to its original position by the force of the spring, the hydraulic oil is returned to the operating oil chamber through the return port formed at the center of the valve body.

In the heavy equipment such as an excavator or a crane, the pilot hydraulic control valve (hydraulic control valve) operates the spool by the pushing cam connected to the pedal which is operated to rotate, and when the pushing cam returns to the neutral position, And return to the neutral position by the elastic force.

However, when returning to the neutral position of the pushing cam, the pushing cam moves beyond the neutral position by the repulsive force due to the excessive elastic force of the spring, thereby touching the opposite port and causing malfunction or vibration of the device itself. Such malfunctions and vibrations due to hydraulic control valves (hydraulic control valves) may cause serious problems in the life span of heavy equipment and safety of work. When the spool and the pushing cam, which are the main parts of the hydraulic pressure regulating valve, return to neutral, the pushing cam leans the opposite port beyond the neutral position due to the repulsive force due to the excessive elasticity of the spring, thereby causing malfunction or vibration of the device itself.

Korean Patent Publication No. 1998-087734 (published on December 5, 1998) Domestic registered patent No. 10-0803963 (registered on February 11, 2008)

SUMMARY OF THE INVENTION It is an object of the present invention to prevent a phenomenon in which a push cam is prevented from overtraveling to the opposite side beyond a neutral position due to an excessive elastic force of the spring when the push rod is pressed and then returned to neutral, And to provide a hydraulic control valve that further enhances the damping function.

According to an aspect of the present invention, there is provided a valve device comprising: a valve body having a fluid chamber and at least one port; A plurality of spools vertically movably inserted through the port and the oil chamber in the valve body to adjust the flow of the hydraulic fluid; A plurality of spool holes provided in the valve body so as to be reciprocated in a longitudinal direction of the spool and communicated with or blocked from the hydraulic oil chamber by longitudinal reciprocating movement of the spool; A pushing cam connected to an upper side of the valve body via a joint and performing a seesaw motion based on the joint; A push rod which is pressed by the pushing cam to press the spool; A damping chamber formed between the outer circumferential surface of the push rod and the valve body; A piston coupled to the push rod to partition the damping chamber into a first damping chamber and a second damping chamber; A valve mounting hole formed in the core body portion inside the valve body to communicate with the plurality of spool holes; And a check valve provided in the valve mounting hole. The hydraulic control valve is provided with a neutral return damping function.

The orifice includes a first orifice communicating with the inside of the first damping chamber and the push rod with respect to the piston, and a second orifice communicating with the interior of the second damping chamber and the push rod .

And the inner diameter of the second orifice is larger than the inner diameter of the first orifice.

And the check valve is detachably coupled to the inside of the core body portion.

In addition to the existing patent, the present invention is characterized in that, in addition to the existing patent, an orifice (check valve mounting hole) is drilled through the valve body so that the push rod, which is disturbed by the airtight operation of the hydraulic oil, can smoothly operate when the push rod (push rod and spool) A kind of check valve is attached and mitigated to prevent sudden movement when the pedal is returned.

FIGS. 1 and 2 show a track and a wheel using a hydraulic control valve,
3 is a longitudinal sectional view showing a structure of a hydraulic pressure control valve according to the present invention.
4 and 5 are longitudinal sectional views showing an operating state of the hydraulic pressure control valve according to the present invention
FIG. 6 is a longitudinal sectional view showing a state in which the valve body of the hydraulic pressure control valve according to another embodiment of the present invention is divided into the upper valve body and the lower valve body
7 is a longitudinal sectional view showing a state in which the check valve is seated on the lower valve body shown in Fig. 6
8 is a longitudinal sectional view showing the structure of a hydraulic pressure control valve according to another embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. For example, if a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, It is to be understood that other components may be "connected "," coupled "

Referring to the drawings, a hydraulic control valve having a neutral return damping function according to the present invention includes a valve body 3 having a hydraulic oil chamber 6 and at least one port 7 therein, A plurality of spools 8 inserted longitudinally movably through a port 7 and a hydraulic oil chamber 6 to regulate the flow of hydraulic fluid, A plurality of spool holes 9 provided in the body 3 and communicating with or disconnected from the hydraulic oil chamber 6 by the longitudinal reciprocating motion of the spool 8; A push rod 5 for pushing the spool 8 while being pressed by the pushing cam 10 and a push rod 5 for pushing the spool 8 by the pushing cam 10, A damping chamber 18 formed between the outer peripheral surface and the valve body 3, A piston 22 coupled to the push rod 5 to partition the valve body 3 into a first damping chamber 18A and a second damping chamber 18B; And a check valve 110 installed in the valve mounting hole 112. The check valve 110 is provided in the valve body 110. The check valve 110 is provided in the valve body 110,

The present invention is characterized in that a plurality (at least two or four) of spools (8) are vertically installed in the valve body (3) and each spool (8) A push rod 5 provided on an upper portion of the valve body 8 and a pushing cam 10 pushing the push rod 5 inwardly of the valve body 3 and a spring 13 for upwardly supporting the respective spool 8, A pushing cam 10 which is connected to an upper side of the valve body 3 via a joint and performs a seesaw motion with reference to the joint, and a pushing cam 10 connected to the pushing cam 10, The spool 8 reciprocates in the spool hole 9 to open and close the port 7 with respect to the operating oil chamber 6 and a lever (not shown) A push rod 5 for pushing the spool 8 while being pressed in a seesaw motion and an outer peripheral surface of the push rod 5 and a valve body 3 A piston 22 coupled to the push rod 5 to partition the damping chamber 18 into a first damping chamber 18A and a second damping chamber 18B, (20) for adjusting the flow rate of the first damping chamber (18A) and the second damping chamber (18B) on the basis of the damping chamber (22) And a return spring 11 for resiliently supporting the piston 22 so as to promptly return the piston 22 to neutral. The core body portion 130 of the valve body 3, A check valve 110 is provided in the valve mounting hole 112 communicating with the spool holes 9 to enhance the neutral return damping function. At this time, it is natural that the present invention can be applied to a common working machine or a hydraulic system having a hydraulically actuated actuator such as an excavator, a hydraulic motor, and a hydraulic cylinder.

The valve body 3 has a structure in which a port 7 connected to an external hydraulic pump and an actuator is provided on the lower side and a hydraulic oil chamber 6 connected to an external hydraulic oil tank is provided on the valve body 3, A spool hole 9 for inserting a lower end of the spool 8 is formed at a lower side of the spool hole 8 Is formed. The spool holes 9 are connected to each other through a connection passage in the valve body 3 so that the intermediate connection passage and the spool hole 9 are closed when the corresponding spool 8 is closed, The valve body 3 may have a structure in which the valve body 3 is branched in the radial direction with respect to the central portion. A pump port 7 connected to the port 7 by a hydraulic pump is formed and a tank port 7 connected to a hydraulic oil tank is formed in the hydraulic oil chamber 6. [

The push rod 5 has a lower end portion connected to each spool 8 and an upper end portion projecting to the outside of the valve body 3 so as to be movable up and down by a single-pipe type guide. The push rod 5 and the spool 8 is provided with an annular support plate and a spring 13 is installed inside the hydraulic chamber 6 so as to support the support plate upward.

The center of the pushing cam 10 is connected to the center of the upper side of the valve body 3 by a joint (which may be a universal joint, if necessary) . The pushing cam 10 pushes the upper portion of the push rod 5 protruding outward from the pivotal center (i.e., the joint portion). A connecting shaft having a threaded portion is provided on an outer peripheral surface of the pushing cam 10 at a central portion on an upper side and a threaded portion is provided on a lower end side outer peripheral surface of a lever disposed above the pushing cam 10, The levers are interconnected to the pushing cam 10 by a nut that is commonly coupled to the threaded portion of the connecting shaft of the cam 10. A screw shaft is formed at a central portion of the pushing cam 10 and a connecting shaft having a threaded portion is provided at the center of the upper surface of the joint so that the threaded portion of the outer circumferential surface of the connecting shaft of the joint is screwed The lever and the pushing cam 10 are coupled to each other by bolts commonly connected to the threaded portion of the outer circumferential surface of the coupling shaft and the threaded portion of the outer circumferential surface of the coupling shaft, Can have an interconnected structure.

The spool 8 has a conventional structure in which a diameter enlarged portion is formed at a predetermined interval so as to open or close the communication passage between the port 7 and the port 7 and the hydraulic oil chamber 6. The spool 8 is inserted into the valve body 3 through the port 7 and the oil chamber 6 so as to be vertically movable to regulate fluid flow between the hydraulic pump, the actuator and the hydraulic oil tank. A plurality of spools 8 are provided on the basis of the central portion of the spool. In the present invention, four spools 8 are provided on the basis of the center of the valve body 3.

In the meantime, in the embodiment of the present invention, the port 7 is formed in the shape of a pipe, the working oil chamber 6 is formed in the shape of a room, and two channels, that is, two ports 7 are arranged vertically It should be understood that the present invention is not limited thereto and that the present invention can be applied to a conventional valve having a port 7 and a hydraulic oil chamber 6 in various shapes and positions. In the embodiment of the present invention, the pushing cam 10 and the spring 13 are exemplified as actuating means for causing the spool 8 to reciprocate, And can be made of various structures for exercising.

The valve body 3 is provided with a spool hole 9 for guiding the spool 8 reciprocally in the longitudinal direction. The spool hole 9 is formed in the valve body 3, And vertically formed inside the valve body 3 so as to be vertically elevated and lowered relative to each other. The spool hole (9) is communicated with or disconnected from the hydraulic oil chamber (6) by the longitudinal reciprocating movement of the spool (8). That is, the flow path between the spool hole 9 and the hydraulic oil chamber 6 can be opened or closed in accordance with the reciprocating motion of the spool 8.

The valve body 3 is provided with a hydraulic oil chamber 6 at an upper position inside the spool hole 9 and a guide hole 4 which is directly above the spool hole 9 at an upper portion of the hydraulic oil chamber 6, Respectively. The lower end of the guide hole (4) communicates with the hydraulic oil chamber (6) and the upper end thereof communicates with the upper side of the valve body (3). The push rod 5 is relatively slidably engaged with the guide hole 4 and the upper end of the spool 8 is connected to the lower end of the push rod 5 via the support plate. When the push rod 5 is pushed and the push rod 5 is pushed down, the spool 8 is pushed down so that the flow path between the hydraulic chamber 6 and the port 7 can be opened do.

The valve body 3 is provided with a spring chamber on the upper side of the spool hole 9 so that a spring 13 is embedded in the spring chamber and a damping chamber 18 is provided in the upper portion of the spring chamber.

The piston 22 is disposed at a position facing a lower portion of the guide hole for raising and lowering the push rod 5 of the valve body 3. Further, the piston 22 has a side wall portion 23 extending downward. The piston (22) is formed as a downwardly sectioned diaphragm shape when viewed in longitudinal section of the valve body. Therefore, a space is ensured between the bottom surfaces of the piston 22 of the side wall portion 23. [ The outer circumferential surface of the piston (22) is in close contact with the inner circumferential surface of the damping chamber (18) secured between the valve body and the outer peripheral surface of the push rod (5). A concave groove is provided on the outer peripheral surface of the piston (22). The concave grooves are provided in a plurality of spaced apart from each other in the vertical direction of the piston (22). The concave groove is constituted by an annular groove extending along the circumferential direction on the outer peripheral surface of the piston (22).

A spring 11 (a return spring 11) is interposed between the bottom surface of the damping chamber 18 and the bottom surface of the piston 22. The lower end of the spring 11 touches the bottom surface of the damping chamber 18 and the upper end of the spring 11 touches the bottom surface of the piston 22. The piston 22 divides the damping chamber 18 into a first damping chamber 18A and a second damping chamber 18B in which the lower end of the spring 11 is connected to the bottom of the second damping chamber 18B And the upper end of the spring 11 is in contact with the bottom surface of the piston 22. [

The first orifice 24 is formed in the upper portion of the push rod 5 so that the inlet orifice 15 and the piston 22 of the first damping chamber 18A. The first orifice 24 is pierced to the side of the push rod 5 and communicates with the inflow hole 15. [ The second orifice 26 communicates with the inlet hole 15 in the push rod 5 and the second damping chamber 18B above the piston 22. [ And the second orifice 26 is also pierced to the side of the push rod 5 to communicate with the inflow hole 15. [ The first orifice 24 communicates with the inflow hole 15 inside the push rod 5 in the lower first damping chamber 18A with respect to the piston 22 and is pushed to the upper second damping chamber 18B. The inlet orifice 15 and the second orifice 26 communicate with each other in the rod 5 and the second orifice 26 and the first orifice 24 are arranged in parallel at upper and lower portions. The second damping chamber 18B is disposed on the upper side of the first damping chamber 18A with respect to the piston 22 and the second orifice 26 is disposed on the upper side of the first damping chamber 18A with respect to the piston 22, (24).

The push rod 5 is provided with a coupling groove at its lower end, and the coupling head of the spool 8 is provided at an upper end thereof, and the coupling head of the spool 8 is engaged with the coupling groove of the lower end of the push rod 5 And is connected in a state of being accommodated. At this time, the push rod 5 has a support plate coupled to the outer circumferential surface of the lower side of the coupling head of the spool 8, and a ring groove is formed on the outer circumferential surface positioned below the bottom of the support plate. So that the coupling head of the spool can be fixedly inserted into the coupling groove at the lower end of the push rod 5. It is possible to adopt a structure in which the push rod 5 and the spool 8 are simultaneously raised and lowered in a state in which the coupling head of the spool 8 is accommodated in the engagement groove at the lower end of the push rod 5. [ Of course, the upper end of the spool 8 may be connected to the lower end of the push rod 5 by welding or the like. It is more preferable to connect the push rod 5 and the spool 8 in such a manner can do.

In the present invention, the valve body (3) is provided with a spool hole (9) around the core body part (130) provided therein. A valve mounting hole 112 is provided in the core body portion 130 so as to communicate with a plurality of spool holes 9 and a check valve 110 is installed in the valve mounting hole 112. And hydraulic pressure is supplied to the respective spool holes 9 through the check valve 110. At this time, the check valve 110 is provided with a hydraulic pressure supply hole, and the hydraulic pressure supply hole is composed of a first hydraulic pressure supply hole and a second hydraulic pressure supply hole communicated with the spool holes 9. A threaded portion is provided on the outer peripheral surface of the check valve 110 and a threaded portion is provided on the inner peripheral surface of the valve mounting hole 112 so that the check valve 110 is detachably coupled to the valve mounting hole 112 by the screw portions .

The overall operation of the hydraulic control valve of the present invention constructed as described above is similar to the conventional one. That is, when the operator pushes or pulls the lever to pivot the pushing cam 10, the push rod 5 selectively pushed down causes the spool 8 connected to the lower portion to descend, The spool 8 is returned upward by the spring 13 and the hydraulic pump and the actuator through the port 7 and the hydraulic oil chamber 6 and the actuator The direction and flow rate of the hydraulic oil supplied between the hydraulic oil tanks are adjusted so that the bucket of the excavator is operated.

In the present invention, the second damping chamber 18B and the first damping chamber 18A are divided into upper and lower portions with respect to the piston 22, and the first orifice 24 and the second orifice 26 are provided (Check valve 110 mounting hole 112) is inserted into the valve body 3 and a check valve 110 is attached to the valve body 3, Operation and effects are as follows.

When the pusher cam 10 presses the push rod 5 and the push rod 5 is pushed down by the pusher cam 10 when the pusher cam 10 is operated so as to push the pusher cam 10 to either side while the pusher cam 10 is seized, The spool 8 descends. The lower end of the spool 8 descends while the spool 8 descends and the oil contained in the first damping chamber 18A when the lower end of the spool 8 descends downward And the second damping chamber 18B through the second orifice 26 located above the piston 22 so that the push rod 5 and the spool 8 can be lowered, and when the spool 8 descends, the port 7 is opened and oil is supplied.

Next, when the operator performs the returning rotation operation of the lever so that the pushing cam 10 is released from the operation of pushing the push rod 5 and the spool 8, the spring 11 (return) in the first damping chamber 18A The piston 22 is pushed upwards, that is, toward the second damping chamber 18B. At that time, the oil in the second damping chamber 18B is again returned to the second orifice 18B 26 into the inflow hole 15 inside the push rod 5 and again through the first orifice 24 to the first damping chamber 18A during which the push rod 5 and the piston 22 and the spool 8 are prevented from rising rapidly due to the urging force of the spring 11 and the spool 8 and the push rod 5 are prevented from rising by excessive force The pushing cam 10 moves beyond the neutral position and touches the opposite port 7 to cause malfunction or vibration of the device itself It is possible to prevent the case. In other words, the spool 8 and the piston 22 are biased by the resilient restoring force of the spring 11, which is pushed in the state in which the push rod 5 and the spool 8 are lowered by the pushing action of the pushing cam 10, And the push rod 5 are returned to the neutral position to return the pushing cam 10 to the neutral position. The second orifice 26 formed in the push rod 5 and the inlet orifice 15 and the first orifice The piston 22 and the spool 8 are urged by the urging force of the spring 11 in a rapid manner as the oil is gradually dropped from the second damping chamber 18B to the first damping chamber 18A through the first damping chamber 18A, (The original horizontal position) by the spool 8 and the push rod 5, in which the pushing cam 10 is lifted up by the excessive force, because the pushing cam 10 does not rapidly rise but gradually rises even if the pushing force acts. The push rod 5 and the spool 8 provided in the opposite phone port 7 are lowered It is possible to prevent a malfunction or vibration of the device itself (i.e., a heavy equipment such as a forklake) itself from being caused.

The operation of pushing down the pushing cam 10, the push rod 5, and the spool 8 is made easier by configuring the first orifice 24 and the second orifice 26 to have different inner diameters, When the spool 8 and the spool 8 are lifted up, the pushing cam 10 is gradually raised so that the pushing cam 10 gradually returns to the neutral position more reliably. The inner diameter of the upper second orifice 26 is made larger than the inner diameter of the lower first orifice 24 so that the push rod 5 and the spool 8 are pressed down by the pushing cam 10, The oil introduced into the first orifice 24 and the inlet hole 15 in the first damping chamber 18A is more sucked out than in the first orifice 24 by the second orifice 26, The pressing operation of the push rod 5 and the spool 8 can be performed more easily while the push rod 5 and the spool 8 are pressed in the pressed state of the spring 11 When the spool 8, the push rod 5 and the piston 22 are lifted by the elastic restoring force, the oil that has entered the second orifice 26 and the inlet hole 15 in the second damping chamber 18B flows into the first Is discharged by the orifice 24 at a slower rate than at the second orifice 26 and is discharged more slowly into the first damping chamber 18A, The operation of slowly returning the spool 8 and the spool 8 is carried out more reliably. In summary, in the present invention, since the inner diameter of the second orifice 26 is made larger than the inner diameter of the first orifice 24, the pressing operation of the push rod 5 and the spool 8 is facilitated, When the spool 8 and the spool 8 ascend to the home position, the pushing cam 10 is reliably controlled so as not to rise rapidly but to gradually rise, so that the pushing cam 10 excessively exceeds the neutral position to prevent malfunction or vibration of the device itself Reliability is high.

As described above, the pushing cam 10, the push rod 5 and the spool 8 can be operated more easily, and the pushing cam 10, the push rod 5, The structure for achieving the function of slowly returning can be made simpler than that of the prior art, so that the operation stability and the convenience of assembly are improved, and the process time and cost are reduced.

2, when the first spool 8 is depressed, the hydraulic pressure is rapidly discharged from the first hydraulic pressure supply hole to the second hydraulic pressure supply hole by the check valve 110, The first spool 8 is rapidly depressed and the other spool 8 (referred to as the second spool 8 for the sake of convenience) rises quickly, The hydraulic pressure is discharged from the first hydraulic pressure supply hole to the second hydraulic pressure supply hole by the check valve 110 when the pressing force of the first spool 8 is released so that the first spool 8 ascends more slowly in a pressed state, 2 The spool (8) descends more slowly at a speed slower than the speed at which the spool (8) ascends.

3, when the second spool 8 is depressed, the hydraulic pressure is quickly discharged from the second hydraulic pressure supply hole to the first hydraulic pressure supply hole by the check valve 110, so that one spool 8 The second spool 8 is quickly pressed while the other spool 8 is rapidly raised and the second spool 8 is pushed down. The hydraulic pressure is discharged from the second hydraulic pressure supply hole to the first hydraulic pressure supply hole by the check valve 110 when the losing force is released, so that the second spool 8 is lowered more slowly in the pressed state and the first spool 8 is moved up It slows down more slowly at a rate slower than the speed of time.

Therefore, the present invention is not limited to the case where the push rod 5 and the first spool 8 (i.e., the first push rod 5 and the first spool 8) are obstructed by the airtight operation of the hydraulic oil when the push rod 5 and the first spool 8 When the push rod 5 is smoothly operated and the push rod 5 and the second spool 8 (i.e., the second push rod 5 and the second spool 8) are pressed and then returned The operation of the push rod 5 which is disturbed by the airtight operation of the hydraulic oil is smoothly performed. The valve body 3 is provided with an orifice (meaning a valve mounting hole 112), and the check valve 110 is attached to the orifice to relieve the sudden movement when the pedal is returned. The damping function for preventing sudden movement when the pedal is returned is further enhanced, thereby preventing malfunction of the valve more reliably. The insertion of the orifice into the main body means that the valve mounting hole 112 is drilled in the core body part 130. Mounting the check valve 110 in the orifice means that the check valve 110 ).

In summary, the spool 8 to be pressed together with the push rod 5 is pushed more quickly by the check valve 110, and the spool 8 which performs a rising operation opposite to the side to be pushed is connected to the check valve 110 The spool 8 that has been pressed and the spool 8 that has been raised gradually move up and down to the original position (that is, the spool 8 And gradually lowering the spool 8 that has been raised), thereby further enhancing the neutral return damping function.

When the check valve 110 is installed in the core body portion 130 of the valve body 3, a hole is formed on the side of the valve body 3 toward the core body portion 130. A hole is formed in the core body part 130 from the side of the valve body 3 so that a thread is formed on the inner circumferential surface of the hole formed in the core body part 130 and a threaded part is formed on the outer peripheral surface of the check valve 110 The check valve 110 is inserted through a hole formed in the lateral side of the valve body 3 so that the threaded portion formed in the valve mounting hole 112 of the core body portion 130 is screwed into the threaded portion of the outer peripheral surface of the check valve 110 The check valve 110 can be mounted to the valve mounting hole 112 of the core body portion 130. [ Further, another hole formed in the side of the check valve 110 may be blocked by coupling the cap 116. A threaded portion is formed on the inner peripheral surface of the other hole 114 formed in the outer body portion outside the core body portion 130 and a threaded portion is formed on the outer peripheral surface of the cap 116, (114) of the outer body portion of the valve body (3) with the cap (116) by engaging with the threaded portion formed on the inner circumferential surface of the other hole (114) of the outer body portion of the valve body (3).

Therefore, it is easy to install the check valve 110 in the valve body 3 in the present invention. A hole is formed in the valve body 3 so as to penetrate the core body portion 130 and the threaded portion is formed on the inner peripheral surface of the hole of the core body portion 130 using a tapping machine, The check valve 110 is inserted into the valve mounting hole 112 of the core body portion 130 through the hole of the outer body portion and then the check valve 110 is rotated so that the thread portion of the outer circumferential surface of the check valve 110 is inserted into the core body portion The check valve 110 can be easily installed inside the valve body 3 by fixing the valve body 110 to the threaded portion formed on the inner circumferential surface of the valve mounting hole 112 of the check valve 110. [ The check valve 110 is provided with a tool engagement groove and a driver having passed through the other hole 114 is inserted into the tool engagement groove of the check valve 110 to connect the check valve 110 with a tool such as a screwdriver The check valve 110 can be coupled to the valve mounting hole 112 formed in the core body portion 130. [

In the meantime, in the present invention, the valve body 3 is configured such that a pair of divided bodies are detachably coupled to each other. When the pair of divided bodies are separated from each other, the valve body 3 is connected to the first core body portion 130 of at least one divided body The first valve part engaging hole is exposed to the upper end of the one divided body, the check valve 110 is engaged with the first valve part engaging hole, and the second core body part of the other divided body 130 may be configured such that the remaining portion of the check valve 110 is coupled to the second valve part engaging hole exposed to the lower end of the check valve 110. In this case also, when the bolts are coupled to the bolt fastening portions formed on the upper and lower split bodies by aligning the two upper and lower split bodies and the split bodies are tightened with the nuts, the first valve part engaging holes and the second valve part engaging holes Since the check valve 110 can be installed in the valve mounting hole 112 formed in the valve body 3, the check valve 110 can be easily installed inside the valve body 3.

The stepped portion SP is provided on the outer circumferential surface of the check valve 110. The first valve part engaging hole and the second valve part engaging hole are provided with stepped grooves, The check valve 110 may be configured to be installed in the valve mounting hole 112 formed in the core body portion 130 of the valve body 3. In this case, the check valve 110 can be stably installed without being detached from the valve mounting hole 112 formed in the core body portion 130 of the valve body 3.

The specific embodiments of the present invention have been described above. It is to be understood, however, that the scope and spirit of the present invention is not limited to these specific embodiments, and that various modifications and changes may be made without departing from the spirit of the present invention. If you have, you will understand.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

3. Valve body 5. Push rod
8. Spool 9. Spool hole
10. Pushing cam 22. Piston
110. Check valve 112. Valve mounting hole

Claims (5)

A valve body (3) having a hydraulic fluid chamber (6) and at least one port (7) therein;
A plurality of spools (8) longitudinally movably inserted into the valve body (3) through a port (7) and a hydraulic chamber (6) to regulate the flow of hydraulic fluid;
A plurality of spools 8 which are provided in the valve body 3 so as to be reciprocated in the longitudinal direction of the spool 8 and which are in communication with or shut off from the hydraulic oil chamber 6 by the longitudinal reciprocating motion of the spool 8; A spool hole (9);
A pushing cam 10 connected to an upper side of the valve body 3 through a joint and performing a shear motion with respect to the joint;
A push rod (5) pressed by the pushing cam (10) to press the spool (8);
A damping chamber (18) formed between the outer peripheral surface of the push rod (5) and the valve body (3);
A piston (22) coupled to the push rod (5) to partition the damping chamber (18) into a first damping chamber (18A) and a second damping chamber (18B);
A valve mounting hole 112 formed in the core body portion 130 inside the valve body 3 to communicate with the plurality of spool holes 9;
And a check valve (110) provided in the valve mounting hole (112). The hydraulic control valve
The method according to claim 1,
And an orifice (20) for adjusting a flow rate of the first damping chamber (18A) and the second damping chamber (18B) based on the piston (22). Hydraulic regulating valve.
3. The method of claim 2,
The orifice 20 includes a first orifice 24 communicating with the interior of the first damping chamber 18A and the push rod 5 with respect to the piston 22 and a second orifice 24 communicating with the second damping chamber 18B And a second orifice (26) communicating with the interior of the push rod (5).
The method of claim 3,
The pushrod 5 is provided with an inlet hole 15 extending vertically therein and the first orifice 24 is connected to the inlet hole 15 in the push rod 5 and the first damping Is communicated with the chamber (18A) and the second orifice (26) is communicated with the inlet hole (15) and the second damping chamber (18B) inside the push rod (5) And a hydraulic control valve.
The method of claim 3,
The second damping chamber 18B is disposed on the upper side of the first damping chamber 18A with respect to the piston 22 and the second orifice 26 is disposed on the upper side of the piston 22, 1 < / RTI > orifice (24).

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