KR100807242B1 - Hydraulic operating valve - Google Patents

Abstract

The present invention relates to a hydraulic control valve, the hydraulic oil remaining in the spool chamber can be discharged through the existing flow path provided inside the valve can be reduced in manufacturing cost and easy to install and maintain hydraulic pressure Its purpose is to provide a control valve.

According to the present invention for achieving the above object, the valve housing 101 is formed with a supply passage 107 connected to the external hydraulic pump and the actuator and a discharge passage 109 connected to the external hydraulic oil tank; At least one spool (103) installed in the valve housing (101) so as to be movable in a longitudinal direction through a supply passage (107) and a discharge passage (109) to regulate a fluid flow between a hydraulic pump, an actuator, and a hydraulic oil tank; And an actuating means for reciprocating the spool 103 in a longitudinal direction, wherein a spool chamber 113 into which an end of the spool 103 to be moved is inserted is formed in the valve housing 101, and the spool Inside the 103, the spool chamber 113 and the discharge passage 109 communicate with each other so that the hydraulic oil remaining in the spool chamber 113 is pressurized according to the movement of the spool 103 to move toward the discharge passage 109. There is provided a hydraulic operation valve in which an exhaust path 106 is formed.

Hydraulic, valve, spool, supply passage, discharge passage, drain passage

Description

Hydraulic Control Valve {HYDRAULIC OPERATING VALVE}

1 is a cross-sectional view showing the internal configuration of a conventional hydraulic control valve

2 is a cross-sectional view showing an embodiment of a hydraulic control valve according to the present invention.

Figure 3 is a partial cross-sectional view showing another embodiment of the hydraulic operation valve according to the present invention

<Description of the symbols for the main parts of the drawings>

101: valve housing 103: spool

105: spring 106: oil passage

107: supply channel 108: auxiliary drain channel

109: discharge passage 110: check valve

113: spool chamber 120: pushing mechanism

121: Push Rod 123: Pushing Cam

The present invention relates to a hydraulic control valve used to control the operation of the actuator by adjusting the fluid supply in the hydraulic operation system, and more particularly, it is possible to prevent the back pressure is applied to the bottom of the spool with a simple structure to reduce the manufacturing cost The hydraulic control valve is easy to install and maintain.

In general, the hydraulic operation system is provided with an actuator such as a hydraulic motor or a hydraulic cylinder, and a hydraulic operation valve for controlling the direction and flow rate of the fluid supplied to the actuator is installed to control the operation of the actuator.

These hydraulic control valves have a variety of structures according to the hydraulic system, for example, a typical hydraulic operation used for the operation of the driving drive or boom, arm, bucket, or turning the vehicle moving part in various heavy equipment such as excavators The internal structure of the valve is shown in FIG.

In the conventional hydraulic control valve shown in FIG. 1, the spools of both sides of the pushing cam 3 are moved by means of mechanical operation means operated by an operator such as an operation stick 2 or, in some cases, a pedal (not shown). (4) is pressed down and the lowered spool (4) is made to return to the upward by the spring (5) is made of a structure for controlling the flow of the working fluid through the inner flow path (6) in accordance with the movement of the spool (4) .

In the hydraulic control valve, a lower portion of the valve housing 1 is formed with a spool chamber 7 into which a lower end thereof is inserted while the spool 4 is moved. As the spool 4 is moved, the spool chamber 7 When the working oil is introduced into the inside, and the introduced working oil remains in the spool chamber 7, the back pressure is applied and the operation of the spool 4 cannot be made properly. Therefore, a means for preventing this is necessary.

By the way, the conventional hydraulic operation valve is configured to discharge the hydraulic oil remaining in the spool chamber 7 to the outside of the valve as described above to drain to the hydraulic oil tank. That is, the connection block 9 having the drain port 8 formed in communication with each spool chamber 7 is coupled to the lower part of the valve, and the drain port 8 is connected to the tank side by installing a separate pipeline. Such a structure of the conventional hydraulic control valve has to be manufactured separately from the connecting block 9, and the manufacturing cost is high because the coupling means such as bolts and additional leakage preventing means such as seals are required, and the assembly process is further required. As a result, there was also a problem of falling productivity.

In addition, it is inconvenient to install because it requires the operation of connecting a separate external pipe, as the connection portion is increased, in particular leakage occurs between the coupling portion of the connecting block 9 and the valve housing (1) There was a troublesome problem.

The present invention is to solve the problems described above, an object of the present invention is to simplify the structure so that the hydraulic fluid remaining in the spool chamber through the existing flow path provided inside the valve can reduce the manufacturing cost It is to provide a hydraulic control valve that is easy to install and maintain.

According to the present invention for achieving the above object, a valve housing formed with a supply passage connected to an external hydraulic pump and an actuator and a discharge passage connected to an external hydraulic oil tank; At least one spool inserted into the valve housing so as to be movable in a longitudinal direction through a supply flow passage and a discharge flow passage to regulate fluid flow between a hydraulic pump, an actuator, and a hydraulic oil tank; It includes an operation means for reciprocating the spool in the longitudinal direction, the spool chamber is formed in the valve housing is inserted into the end of the moving spool, the spool chamber and the discharge passage in communication with the inside of the spool There is provided a hydraulic operation valve having a drainage path for allowing the hydraulic fluid remaining in the spool chamber to be pressurized in accordance with the movement of the spool and moved to the discharge flow path.

The hydraulic operation valve of the present invention, the auxiliary oil passage formed to communicate the spool chamber and the discharge passage in the valve housing, and is installed in the auxiliary oil passage and the hydraulic oil flow from the spool chamber to the discharge passage side and vice versa Directional flow may be made of a structure further comprising a check valve for blocking.

In the hydraulic operation valve of the present invention, the operating means is connected to the spool and the other side of the push rod is installed to protrude outwardly of the valve housing to move longitudinally, and press the end protruding out of the push rod It may include a pushing mechanism for moving the spool toward the spool chamber side, and a spring for supporting at least one side of the push rod and the spool to apply elastic restoring force to the spool in a direction opposite to the pushing direction of the pushing mechanism. .

The pushing mechanism may include a pushing cam rotatably installed at one side of the valve housing such that at least one side portion spaced from the center of rotation rotates the push rod, and a rotating means for rotating the pushing cam. It may be made of.

The objects, features and advantages of the present invention described above will become more apparent from the following detailed description. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is an internal cross-sectional view showing an embodiment of the hydraulic operation valve according to the present invention, but illustrates that the present invention is applied to the operation operation stick portion of the excavator, the present invention is not limited to this, the hydraulic motor, It can be applied to all conventional hydraulic systems having hydraulically actuated actuators such as hydraulic cylinders.

The embodiment shown in Figure 2 illustrates that it is installed in the operation stick portion of the excavator, as shown in the hydraulic operation valve of the present invention, a pair of spools 103 can be raised and lowered on both sides of the inside of the valve housing 101 And a push rod 121 installed on the upper portion of each spool 103, the push rod 121 being pressed into the valve housing 101 as an operation means for reciprocating each spool 103 up and down. Pushing mechanism 120 and a spring 105 for supporting each spool 103 upward.

The valve housing 101 has a supply passage 107 connected to an external hydraulic pump and an actuator at an inner lower side thereof, and a discharge passage 109 connected to an external hydraulic oil tank at an upper side thereof. A connection flow path 111 is formed between the supply flow path 107 and the discharge flow path 109 so that the spool 103 is movably inserted therein, and below the connection flow path 111 of the spool 103. The spool chamber 113 into which the lower end is inserted is formed. Although not shown, a pump port connected to the hydraulic pump is formed in the supply passage 107 and a tank port connected to the hydraulic oil tank is formed in the discharge passage 109.

The push rod 121 has a lower end connected to each spool 103 and the upper end protrudes out of the valve housing 101 so that the push rod 121 can be vertically moved by the guide 115 having a short pipe shape. An annular support plate 117 is provided at the connection portion between the and spools 103, and the spring 105 is installed inside the discharge passage 109 so as to support the support plate 117 upward.

The pushing mechanism 120 is rotatably coupled to the upper part of the valve housing 101 in the form of a seesaw so that both side portions spaced apart from the center of rotation are pressed to press the upper ends of the push rods 121, respectively. Composed of a pushing cam 123 and the operation stick 125 is coupled to the pushing cam 123 and extended upward.

The spool 103 has a conventional structure in which the enlarged diameter portion 104 is formed at predetermined intervals so as to open or close the connection passage 111 between the supply passage 107 or the supply passage 107 and the discharge passage 109. It is made, but the drainage path 106 is formed in the longitudinal direction therein. The lower side of the flow passage 106 communicates with the inside of the spool chamber 113 through the bottom of the spool 103, and the upper side thereof communicates with the discharge passage 109 through the side portion of the spool 103.

The overall operation of the hydraulic operation valve of the present invention configured as described above is made similar to the conventional one. That is, when the operator pushes or pulls the operation stick 125 to rotate the pushing cam 123, the push rod 121 of one side that is selectively pressed lowers the spool 103 connected to the bottom thereof, and the pushing cam 123 When the lowering force is released by the spring spool 103 is returned by the spring 105, and through the supply passage 107 and the discharge passage 109 according to the position of each spool 103 by this operation The oil supply direction and flow rate between the hydraulic pump and the actuator and the oil tank are regulated.

When the spool 103 is lowered by the push rod 121, the lower end of the spool 103 is moved downward into the spool chamber 113. In this case, the hydraulic oil introduced into the spool chamber 113 is introduced into the spool chamber 113. Due to the downward pressure of the spool 103, the spool 103 is moved into the discharge passage 109 through the drain passage 106 and is naturally drained.

Accordingly, the connection block and the coupling means of the connection block and the leakage preventing means, which are necessary for the conventional valve, to drain the hydraulic oil remaining in the spool chamber 113 to the hydraulic oil tank, are not required. The operation valve has the advantage of lower production cost and higher productivity. In addition, there is no need for a separate connection line on the outside, the installation work is easy, and as the coupling part or the connection part is removed, the leakage of oil is also prevented, and thus the maintenance is easy.

On the other hand, the hydraulic operation valve of the present invention, as shown in Figure 3, made of the same structure as the above-described embodiment, so as to communicate the spool chamber 113 and the discharge passage 109 to the valve housing 101 The auxiliary exhaust passage 108 may be further formed, and the check valve 110 may be installed at one side of the auxiliary exhaust passage 108. The check valve 110 is installed to apply the hydraulic oil flow from the spool chamber 113 to the discharge passage 109 but to block the flow in the opposite direction, the inner diameter of the drain passage 106 is smaller than in the above-described embodiment It is preferably formed.

In this case, when the spool 103 is lowered, the working oil of the spool chamber 113 is moved to the discharge passage 109 through the paths of both the drain passage 106 and the auxiliary drain passage 108, so that the push rod 121 is moved. The force required when lowering is reduced, and the operator's operation is more convenient. When the spool 103 is raised, the hydraulic oil is moved only through the oil passage 106, so that the inner diameter of the oil passage 106 is appropriately reduced. The rapid rise of the spool 103 by the spring 105 is prevented so that the operation of the device operated by the operation valve can be made smoothly. This is useful for extending the life of the device and improving safety during operation.

Meanwhile, in the above-described embodiment, the supply passage 107 is formed in the form of a pipe and the discharge passage 109 is formed in the form of a chamber. The present invention may be applied to a conventional valve having a supply passage 107 and a discharge passage 109 in various forms and positions.

In addition, in the above-described embodiment, the pushing mechanism 120 and the spring 105 are illustrated as an operation means for reciprocating the spool 103, but this operation means reciprocates the spool 103 in a conventional valve. It may be made of a variety of structures. In addition, the present invention may be applied to a case in which a known operating mechanism such as a pedal is used instead of the operating stick 125 illustrated as a means for rotating the pushing cam 123 in the pushing mechanism 120.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

As described above, according to the present invention, by simplifying the structure so that an additional flow path is formed in the spool to drain the oil of the spool chamber and the external pipe is not necessary, the manufacturing cost of the hydraulic operation valve is reduced and the productivity is improved. Its effect is to facilitate installation and maintenance.

In addition, additional auxiliary flow paths are formed in the valve housing so that when the spool is moved into the spool chamber, the hydraulic fluid is moved through both the drain path and the auxiliary drain path, and when the spool is moved out of the spool chamber, the hydraulic oil is supplied only through the drain path. By moving, the operation of the valve is facilitated, while the rapid movement of the spool by the spring is prevented, thereby improving the life of the hydraulic system and increasing the safety of the operator.

Claims (4)

delete A valve housing 101 having a supply passage 107 connected to an external hydraulic pump and an actuator and a discharge passage 109 connected to an external hydraulic oil tank, and a supply passage 107 and a discharge to the valve housing 101. At least one spool 103 inserted and installed in a longitudinally movable direction through the flow path 109 to regulate a fluid flow between the hydraulic pump, the actuator and the hydraulic oil tank; An operation means for reciprocating the spool 103 in the longitudinal direction, the inside of the spool 103 of the spool chamber 113 into which the end of the spool 103 to be moved is inserted inside the valve housing 101. The oil passage 106 for communicating the spool chamber 113 and the discharge passage 109 so that the hydraulic oil remaining in the spool chamber 113 is pressurized in accordance with the movement of the spool 103 so as to move toward the discharge passage 109. In the hydraulic control valve is formed, Auxiliary drain passage 108 formed to communicate the spool chamber 113 and the discharge passage 109 to the valve housing 101, and is installed in the auxiliary drain passage 108, the discharge passage from the spool chamber 113 ( 109) the hydraulic operation valve further comprises a check valve (110) for applying the hydraulic fluid flow to the opposite direction flow. The method of claim 2, One side of the operation means is connected to the spool 103 and the other side of the push rod 121 protrudes outwardly of the valve housing 101 and is installed to be movable in the longitudinal direction, and protrudes out of the push rod 121. The pushing mechanism 120 for moving the spool 103 toward the spool chamber 113 side by pressing an end thereof, and the elastic restoring force is applied to the spool 103 in a direction opposite to the pushing direction of the pushing mechanism 120. Hydraulic operation valve comprising a spring (105) for supporting at least one side of the push rod 121 and the spool (103). The method of claim 3, The pushing mechanism 120 is rotatably installed at one side of the valve housing 101 so that at least one side spaced apart from the center of rotation pushes the push rod 121 and the pushing cam. Hydraulic operation valve comprising a rotating means (125) for rotating (123).

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