KR102257572B1 - An improved leverage device of a remote hydraulic pressure of control valve - Google Patents

Abstract

The contact surface operated by pressing the plunger 25 using the operation lever device is composed of at least one involute curve, so that the involute curved surface 46 is located on the center axis of the plunger when the operation lever 43 is tilted. By rolling contact only at the contact point 49, a lever mechanism of a hydraulic remote control valve is provided so that a force can be applied to the plunger only in a vertical direction.

Description

Improved lever mechanism of hydraulic remote control valve {AN IMPROVED LEVERAGE DEVICE OF A REMOTE HYDRAULIC PRESSURE OF CONTROL VALVE}

The present invention relates to a lever mechanism of a valve for remotely controlling the fluid pressure of a hydraulic functional product used in a hydraulic device.

More specifically, in order to reduce and use the pilot pressure of hydraulic devices such as directional joystick, directional control foot valve, piston pump swash plate angle control valve, brake plunger, etc., the flow of the inflowing high-pressure fluid is controlled. It relates to a lever mechanism for operating a reciprocating plunger by tilting an operating lever to operate a spool to reduce pressure by axial pressure.

As shown in Fig. 2, U.S. Patent 6,125,886 (1998.11.18) discloses a pilot valve having a lever mechanism used as a control device of a hydraulic machine. Here, the operation lever 144 is pivotally coupled to the rotational center point 148 on the valve body 101, and the conical contact surface 146 provided at one portion on the operation lever is tilted, and the head A hemispherical (半球形) reciprocating plunger 125 is provided to press the reciprocating motion. Therefore, the displacement of the plunger 125 generated by tilting the operating lever 144 applies a thrust force to the spring 134, and the spool 135 in contact with the spring 134 is operated to one side. , A pair of throttling orifices 118 and 119 installed inside the valve body 101 are operated, and the pressure in the pilot chamber 104 generated by throttling the fluid flow passing through the throttling orifice is formed. , This pressure acts on the spool large diameter portion 137 of the spool and is configured to be in equilibrium with the force of the spring 134, and the pilot pressure is reduced according to the tilt angle of the operating lever. Is adjusted.

In the conventional technology, when the operation lever 144 is tilted against the single plunger 125, the conical contact surface is rotated while contacting the hemispherical surface of the plunger 125, and the contact point It forms a moving trajectory that crosses the top dead center. Therefore, the rotational moment of the operating lever acting on the contact point beyond the top dead center of the plunger causes a lateral force in the axial direction along with the axial force on the plunger 125, and in particular, frictional contact between the contact surfaces is generated. As it is done, wear occurs. This lateral force causes abrasion between the outer circumferential surface of the plunger 125 and the guide sliding hole, and the clearance of the guide surface becomes large after long-time use. Hydraulic oil leaking through the wider gap contaminates the cab.

In addition, as shown in FIG. 4, when the operation lever is tilted between two adjacent plungers to operate the two plungers at the same time, the contact points between the respective plungers and the conical contact surface to the tilt axis of the operation lever Each distance becomes shorter than the contact point distance when operating a single plunger, and as the rotation angle of the conical contact surface increases, the contact point is formed further from the center axis of the plunger, and the transverse force on the plunger increases.

In Korean Patent Registration KR10-1265542 (2013.05.13), the upper part of the plunger is composed of a semi-spherical surface, and a contact surface formed in a cycloid curve is formed on a part of the operation lever to form a rolling contact for reducing frictional force. However, since the contact point can act at an eccentric position from the center axis of the plunger, the lateral force still remains.

In another conventional technique in the present invention, in order to reduce the lateral force acting on the plunger, these have disclosed the configuration of the operation lever mechanism in which the upper portion of the plunger is formed in a plane and the round ball is used as a contact member. The contact point is moved away from the center axis of the plunger due to the rotational motion, so that the lateral force due to the eccentric load remains.

The problem to be solved of the present invention is, in an operation lever mechanism of a hydraulic valve that remotely controls a fluid pressure, when one contact surface on an operation lever that rotates around a rotation center point contacts the plunger, the location of the contact point is the plunger. The improved lever mechanism is provided to reduce the lateral force generated by the operating force acting on the plunger by always being formed only on the central axis of the plunger. In addition, the contact surface of the operating lever and the plunger are in contact with the plunger's central axis. It provides a more improved lever mechanism that allows rolling contact only on the phase, thereby reducing the frictional lateral force generated on the plunger.

In order to solve the problem of the present invention, the lever mechanism of the present invention comprises a main body 1 having a flow path and at least one or more throttling orifices 70 and 71 for reducing the pressure of the fluid flowing through the flow path therein; At least one plunger (25) installed on the main body (1) and reciprocating to drive the throttling orifices (70,71); An operation lever 43 pivotally coupled to a rotation center point 48 at an upper end of the main body 1; And in at least one contact surface that is coupled to the operation lever (43) to move the plunger (25) by pressing the operation lever (43), the contact surface is the plunger (25) when the operation lever (43) is tilted. It is characterized by consisting of at least one involute curved surface 46 formed in at least one involute curve so that contact is made only at one contact point 49 at the upper end located on the central axis 60.

The involute curved surface 46 is formed by respective involute curves formed in the same direction according to the tilting direction of the operation lever 43 at the contact point 49 where the curve starts, and the respective involutes The curve includes the rotation center point 48 and on the theoretical plane 61 perpendicular to the center axis 60 of the plunger 25, from the center axis 60 of the plunger to the tilt axis 47 of the operating lever. It is formed using the vertical distance (50', 53', 55') up to 51) as the basic circle radius.

The involute curved surface 46 is configured to be in rolling contact with a round ball 26 or a cylindrical roller rotatably provided on an upper end of the plunger 25.

The involute curved surface is formed on the independent member 80 and is detachably coupled to the operation lever 43.

In the lever mechanism of the present invention, as shown in Fig. 3, by applying the geometrical action of the involute curve, one involute curve 50 on the operating lever 43 that rotates is based on a point on the basic circle. As a configuration means of a lever mechanism of a hydraulic remote control valve that is in contact with and rolls along a central axis 60 of the plunger 25 installed perpendicular to the circle radius 50',

At least, the fluid flowing into the connector 10 communicating with the external high pressure generating device passes through at least one throttling orifice 70 and 71 and is throttled while the depressurized fluid is discharged. A main body 1 with one connector 11;

At least one plunger (25) provided to adjust the opening area of the orifices (70, 71) by driving the head portion installed in the main body (1) in a lever manner;

A round ball 26 or a cylindrical roller is provided on the head of the plunger, so that the involute curve is provided in rolling contact;

An operation lever 43 that is rotationally coupled to one rotation center point 48 of the upper end of the main body 1; And

In the at least one contact surface configured to move by pressing the plunger 25 as it is coupled to the operation lever 43 and tilted,

In the case of operation by tilting the operating lever forward or backward, a straight line from the rotation center point 48 to the contact point 49 on the theoretical plane 61 perpendicular to the center axis 60 of the plunger 25 The contact surface may be configured, characterized in that it is formed by at least one involute curve 53 having a distance as a base circle radius 50',

In addition, when the operating lever 43 is tilted in a direction 56 between two adjacent plungers, the operating lever 43 is moved from the center line 60 of each plunger to the tilting shaft ( Involute curves (53, 55) with the vertical distance (53', 55') up to 51) as the basic circle radius are characterized by an involute curved surface (46) formed by gathering a plurality of them, and the center axis of each plunger A contact surface in contact with may be configured. Each of the involute curved surfaces 46 are symmetrical to each other about the theoretical plane including the involute starting point 49 and the center line of the reciprocating plunger and the rotation center point 48, so that an arbitrary tilting direction of two adjacent plungers Also, it is configured so that the contact point with the involute curve can be formed on the central axis of each plunger.

According to the present invention, regardless of the contact surface having the involute curved surface 46 and the contact point 49 in contact with the plunger 25, the center line of the plunger 25 ( 60,60') always on the top, and through rolling contact, the lateral force on the plunger is reduced to suppress friction damage on the outer circumferential surface of the plunger. It is possible to prevent the operator's work environment pollution by suppressing the leakage of oil in the cracks of the plunger.

1 is a cross-sectional view showing a lever mechanism of a hydraulic remote control valve according to an embodiment of the present invention.
2 is a cross-sectional view showing a hydraulic remote control valve according to an embodiment of the prior art.
3 is a schematic cross-sectional view illustrating the operation of an involute curve in which a contact point is formed on the center line of the plunger when the operation lever is tilted toward a single plunger in the lever mechanism of the remote control valve according to an embodiment of the present invention .
4 is a kinematic formation of an involute curve forming a contact point on the center line of each plunger when the operation lever is tilted in an exemplary direction between a single or two adjacent plungers according to an embodiment of the present invention. It is a schematic mechanism to describe the element.
FIG. 5 is a partial perspective view of an operation lever having an involute curved surface fixedly installed on a part of an operation lever that tilts in all directions so as to simultaneously operate adjacent plungers according to an embodiment of the present invention.
6 is a partial perspective view of a member having an involute curved surface configured to be detachably installed on a part of a tiltable operation lever for driving a plurality of plungers according to an embodiment of the present invention.
7 is a cross-sectional view illustrating a lever mechanism of a hydraulic remote control valve in which an operation lever is replaced with a stepping pedal in a lever mechanism for operating a plunger in a front and rear tilting mode according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail. However, this is presented as an example, and the present invention is not limited thereby, and the present invention is only defined by the scope of the claims to be described later. The embodiments to be described later may be modified in various forms without departing from the concept and scope of the present invention. As far as possible, the same or similar parts are indicated using the same reference numerals in the drawings.

The terminology used below is only for referring to specific embodiments, and is not intended to limit the present invention. Singular forms as used herein also include plural forms unless the phrases clearly indicate the opposite. The meaning of "comprising" as used in the specification specifies a specific characteristic, region, integer, step, action, element and/or component, and other specific characteristic, region, integer, step, action, element, component and/or group It does not exclude the existence or addition of

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, the following examples are only preferred examples of the present invention, and the present invention is not limited to the following examples.

1 shows a lever mechanism of a hydraulic remote control valve 100 according to an embodiment of the present invention.

The hydraulic remote control valve 100 of this embodiment is provided with one rotation center point 48 at the center of the upper end of the valve body 1, an operation lever 43 pivotally coupled to the rotation center point 48, and the rotation center point 48 ), a plurality of vertical cylindrical holes 44 are provided in parallel with each other at the same distance, and a cylindrical sealing box 27 having sealing members 30 and 31 is embedded at the upper end of the vertical cylindrical hole 44, and , In the hole in the center of the sealing box 27, a plunger 25 having a spherical ball in the head is configured to be moved.

The involute curved surface 46 provided to be integrally or detached from a part of the operation lever is formed of a curved surface by arranging several mouth volute curves at a common contact starting point.

One of the involute curves forming the involute curved surface 46 is, as shown in FIG. 4, when the operating lever has a tilt axis 47 and tilts toward the plunger 25, as shown in FIG. The distance 50' from the contact point 49 on the central axis 60 of 25) to the intersection point 48 that intersects the transverse axis 47 at a right angle is formed as a basic circle radius.

And when the operating lever 43 is tilted toward the adjacent plungers 25 and 25' with the tilting shaft 51, the inverted volute curved surface 46 is formed by a plurality of involute curves 50, 53, 55) the starting point (49') is shared at the one contact point (49), and the basic circle radius (50') of one involute curve among the plurality of involute curves is the central axis (60) of the plunger (25) It is formed as a linear distance from the rotational center point 48 to the contact point 49 on the theoretical plane 61 perpendicular to the base circle radius 53', 55 of another involute curve among a plurality of involute curves. ') is, at each of the contact points 49 and 49' of adjacent plungers, when the operating lever 43 tilts in the direction between adjacent plungers 25, ) (tilting axis) is formed with each vertical distance (53', 55'), and while simultaneously controlling not only a single plunger 25, but also an adjacent plunger, the operating lever 43 When tilted, each of the contact points 49 and 49 ′ with the involute curves 53 and 55 is characterized by an involute curved surface formed to make contact on the respective central axis of the plunger 25 and 25 ′. , Even if the operating lever is tilted in any tilting direction, a contact point is formed only on the central axis of the plungers 25 and 25', so that the lateral force is suppressed.

The return oil chamber 5 is provided in the inside of the valve body 1, and communicates with an oil tank (not shown) connected to the tank passage 15 by providing a disk-shaped passage in which the male hole 44 communicates with each other. ) Is configured, and another disk-shaped passage through which the vertical cylindrical holes 44 communicate with each other is provided in the lower portion of the main body 1, and the primary pressure chamber 3 communicates with the connection port 10 of the pressure source 200. ) Is composed.

The secondary pressure chamber 4 is provided with a valley in the inner circumferential surface between the return oil chamber 5 and the primary pressure chamber 3 of each male through hole 44, and communicates with the connection port 11 of the external device 300. ).

Each of the male through hole 44 is provided with a hole 17 at the upper end, a hole 18 at the middle, and a spool hole 19 at the lower end having a diameter smaller than the diameter of the spool hole 18 at the middle part, as long as the hole 17 is concentrically provided. The side passages 22, 23, and 24 that receive the sleeve 16 and are radially provided are configured to communicate with the return oil chamber 5, the secondary pressure chamber 4, and the primary pressure chamber 3, respectively.

In the hole 17 of the upper end of the sleeve 16, a disk-shaped spring support plate 33 having a through hole in the center thereof is movably accommodated, and an upper end side of the spring support plate 33 is a bottom surface of the plunger 25 This contact is made, and the lower end side of the spring support plate 33 is configured to come into contact with the spring for upward movement of the spring support plate together with the spring for downward movement of the spool 34.

A circular rod-shaped spool 34 provided with annular ends 37 and 38 having different diameters on the same axis line is provided with a middle hole 18 and a lower hole of the sleeve 16 ( It is accommodated to be movable by 19), constitutes a throttle orifice (70, 71), is supported on one side by the spring (35) so as to be movable.

Referring to Figure 7 shows an embodiment in which the operating lever tilts forward or backward around a hinge point. Here, the operation lever is configured to be replaced by the pedal 40 so that the driver can operate it with his or her feet.

Hereinafter, the operation of the embodiment according to the present invention will be described.

As shown in FIG. 3 or 4, while the operation lever 43 is tilted about the rotation center point 48, it is directed toward the central axis 60 of the plunger 25, or between two adjacent plungers. In either direction 56, the involute curved surface 46 is tilted and at least one point (49,49') on the central axis (60,60') of at least one plunger (25,25') is While rolling contact, the plunger 25 is pressed and moved, and the lateral force caused by the frictional force generated in the plunger is reduced.

Accordingly, the spring support plate 33 is pressed by the plunger 25, thereby increasing the force of the spring 35, and the annular end 37 of the spool 35 receiving the secondary pressure chamber pressure. Resisting the force acting on ), it acts to press the spool (34). Therefore, the annular ends 37 and 38 of the spool 34 move in the same direction, so that the annular end 38 opens the throttle orifice 71, so that the oil from the primary pressure chamber 3 to the secondary pressure chamber 4 At the same time, the annular end 37 closes the throttle orifice 70 to prevent oil from flowing from the secondary pressure chamber 4 to the return oil chamber 5. In this way, the pressure of the secondary pressure chamber 4 rises against the spring 35 until the throttle orifice 70 is opened again, and a certain pressure is maintained. In this way, the opening and closing of the throttling orifices 70 and 71 is repeated, so that the spool 34 is set in a corresponding position according to the tilting angle of the operating lever 43 so that the secondary oil pressure is adjusted, the passage 14 and the It is transmitted to the hydraulic device 300 through the connector 11.

When the driver releases the operating force from the operating lever, the elastic force of the spring 42 pushes up the spring support plate 33, and the spool 34 spanning the annular end 36 at the head of the spool 34 is also lifted upwards. Therefore, the high pressure is blocked by closing the throttling orifice 71 between the primary pressure chamber 3 and the secondary pressure chamber 4, and at the same time, between the secondary pressure chamber 4 and the return oil chamber 5 As the throttle orifice 70 is opened, the hydraulic remote control valve returns to the neutral position.

As described above, exemplary embodiments of the present invention have been shown and described, but various modifications and other embodiments may be made by those skilled in the art. These modifications and other embodiments are all considered and included in the appended claims and will not depart from the true spirit and scope of the present invention.

One ; Valve body 3; Primary pressure chamber
4 ; Secondary pressure chamber 5; Return oil chamber
10,11: connector 15: tank passage
16: sleeve 18, 19: spool hole
22,23,24: side passage 25,25': plunger
26: round ball 27; Sealing marguerite
30,31: sealing member 33; Spring support plate
34: spool 35; spring
37,38; Ring-shaped end part 40; pedal
43: operation lever 44; Male through hole
46; Involute curved surface 47, 51; Scripture axis
48; Rotation center point 49: contact point
50,53,55; Involute curve
50',53',55': radius of the base circle
57, 58; Gyeongjeon axis intersection
60,60': center axis 70,71; Throttling orifice
80; Detachable involute curved member
200; Pressure source 300; Hydraulic system

Claims (4)

A main body (1) having a flow path and at least one or more throttling orifices (70,71) for reducing pressure of fluid flowing through the flow path;
At least one plunger (25) installed in the main body (1) and reciprocated to drive the throttling orifices (70,71);
An operation lever 43 pivotally coupled to a rotation center point 48 at an upper end of the main body 1; And
At least one contact surface that is coupled to the operation lever 43 to move the plunger 25 by pressing the plunger 25 according to the tilt of the operation lever;
In the lever mechanism of the hydraulic remote control valve comprising a,
The contact surface is at least one involute curve formed with at least one involute curve so that contact is made only at one contact point 49 at the upper end located on the central axis 60 of the plunger 25 when the operation lever 43 is tilted. It is composed of a lute curved surface 46,
The involute curve includes the rotation center point 48 and on the theoretical plane 61 perpendicular to the central axis 60 of the plunger 25, the tilt of the operating lever from the central axis 60 of the plunger A lever mechanism of a hydraulic remote control valve formed by using the vertical distance 50' to the shaft 47 as a basic circle radius. The method of claim 1,
The involute curved surface 46 is formed by each involute curve formed in the same direction according to the tilting direction of the operation lever 43 at the contact point 49 where the curve starts, and the respective involute curves Silver, on the theoretical plane 61 including the rotational center point 48 and perpendicular to the central axis 60 of the plunger 25, the tilt axis 51 of the operating lever from the central axis 60 of the plunger The lever mechanism of the hydraulic remote control valve, which is formed by using the vertical distances 53', 55' to the base circle radius. The method according to claim 1 or 2,
The involute curved surface 46 is configured to roll in contact with a round ball 26 or a cylindrical roller rotatably provided on an upper end of the plunger 25, a lever mechanism of a hydraulic remote control valve. The method according to claim 1 or 2,
The involute curved surface is formed on the independent member (80) and a lever mechanism of a hydraulic remote control valve that is detachably coupled to the operation lever (43).

Images