JP2517771Z - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve used for various control valves such as a hydraulic control valve. 2. Description of the Related Art As a conventional solenoid valve of this type, for example, there is one as shown in FIG. That is, in the solenoid valve 100, a spool 102 is slidably inserted into the inner periphery of a valve sleeve 101 as a valve body.
The solenoid 103 is reciprocally driven by utilizing the electromagnetic attraction force of the solenoid 103 integrated with the solenoid 01. The solenoid 103 has one end connected to a plunger 104 as an inner movable iron core and the other end protruding into the valve sleeve 101.
5 for driving the spool 102 via the rod 105. The valve sleeve 101 has a first port 106 on the fluid supply source side, a second port 107 on the actuator side as a controlled part, a third port 108 for discharging return fluid from the actuator, Spool 102 and valve sleeve 101
A fourth port 109 is provided for discharging fluid that has accumulated inside the solenoid 103 due to leakage between them, and the communication state between the ports is switched by movement of the spool 102. The valve sleeve 101 is inserted into the inner periphery of a mounting hole 111 of a mating housing 110 of a mating member. Each of the first to fourth ports 106 to 109 corresponds to each port. Are connected to the four supply passages 112, the outlet passages 113, the return fluid discharge passages 114, and the stagnant fluid discharge passages 115. [0005] However, in the case of the above-described conventional technology, the fourth port 109 for discharging the stagnant fluid in the solenoid 103 is provided on the distal end side of the valve sleeve 101 and also on the actuator side. Since there is a third port 108 for return fluid discharge, the mating housing 1
10 requires two fluid discharge passages 114 and 115 corresponding to the third and fourth ports 108 and 109, respectively. When the fourth port 109 for discharging the stagnant fluid in the solenoid 103 is located on the distal end side of the valve sleeve 101, when the solenoid 103 is turned on → off, the fluid accumulated inside the solenoid 103 is discharged. The fluid is discharged from the inside of the valve sleeve 103 into the valve sleeve 101. The operating direction of the spool 102 is opposite to the flow direction of the fluid, and a damper effect occurs due to the effect of viscous resistance.
Had the drawback that it made the movements worse. Further, conventionally, when the space between the first port 106 and the second port 107 is closed, fluid is not supplied to a rotary bearing portion or the like of an actuator (not shown), so that a separate lubrication flow path must be provided. However, there is also a problem that the cost is increased due to complexity. The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a return flow from a controlled part through a discharge passage of a counterpart mounting member to which a valve body is assembled. With the fluid retained by the solenoid, and with a simple structure, always enables lubrication of the bearings on the controlled part side, regardless of the opening and closing of the port due to the movement of the spool. Is to prevent it. In order to achieve the above object, according to the present invention, there is provided a solenoid, a valve body having an inner hollow portion integrally assembled with the solenoid, and a sliding member inside the valve body. A freely inserted spool, and a rod having one end connected to a plunger functioning as a movable iron core inside the solenoid and the other end protruding into the valve body and operatively connected to the spool. Are a first port on the fluid supply source side and a second port on the controlled part side.
Port and a third port for discharging the return fluid from the control unit, and a fourth port for discharging the staying fluid in the solenoid, set only the said valve body to the mounting portion of the mounting mating member The first to fourth ports are connected to a flow path provided in a mounting member that opens corresponding to each port, and the first and fourth ports on the fluid supply source side are energized and de-energized by a solenoid. In the solenoid valve for opening and closing the port,
A port is located between the spool and the solenoid, and a communication path for communicating the fourth port and the third port is provided on the outer periphery of the valve body, and the discharge flow path on the mounting partner side is integrated into one. , At least one of the spool land and the valve body
A lubricating passage communicating between the first port and the second port is provided on
Irrespective of the opening and closing of the port due to the movement of the
And a lubricating fluid can be supplied thereto. [0010] In the solenoid valve having the above-described configuration, the fluid retained in the solenoid discharged from the fourth port and the return fluid from the controlled part discharged from the fourth port via the communication passage provided on the outer periphery of the valve body are attached to the other side. It is discharged from one discharge passage provided in the member. Further, since the fourth port is disposed between the solenoid and the spool, even if the stagnant fluid in the solenoid flows into the valve body, the stagnant fluid flows smoothly from the fourth port without affecting the spool. leak. [0012] Even if fluid such as hydraulic oil to the controlled part is shut off, the lubrication passage communicating between the first port and the second port provided on the peripheral surface of the land of the spool or the peripheral surface of the valve body is formed. The fluid is always connected to the controlled part to lubricate the controlled part. Hereinafter, the present invention will be described with reference to the illustrated embodiment. In FIG. 1 showing an electromagnetic valve according to an embodiment of the present invention, reference numeral 1 denotes an entire electromagnetic valve, which is generally inserted into a valve sleeve 2 as an internally hollow valve main body and reciprocatingly inserted into the valve sleeve 2. And a solenoid 4 integrally attached to one end of the valve sleeve 2. The solenoid valve 1 of this embodiment is for hydraulic control, and the valve sleeve 2 has a first port 5 on the pressure source side as a fluid supply source and a second port 5 on the actuator 9 side as a controlled part. 6, a third port 7 for discharging the return fluid from the actuator 9, and a fourth port 8 for discharging the staying fluid in the solenoid 4. The first to fourth ports 5 to 8 are respectively provided on side walls of the valve sleeve 2. Among them, the first port 5 is disposed closest to the distal end side of the valve sleeve 2. On the other hand, the second, third, and fourth ports 6, 7, 8 are arranged separately on opposite sides with respect to the center axis of the valve sleeve 2. That is, the third and fourth ports 7, 8
Are arranged on the same side, and the second port 6 is arranged on the opposite side. Further, the second port 6 is constituted by two output sides and return second ports 61 and 62 which are separated in the axial direction. On the other hand, the third and fourth ports 7 and 8 are arranged in the order of the third and fourth ports 7 and 8 from the distal end side of the valve sleeve 2 toward the solenoid 4, and the fourth port 8 is provided with the spool 3 and the solenoid 4 It is located between. A communication passage 10 is provided on the outer periphery of the valve sleeve 2 so as to communicate between the fourth port 8 and the third port 7. The valve sleeve 2 is inserted into an inner periphery of a mounting hole 12 provided in a mating housing 11 which is a mating member. The mating housing 11 is provided with a pressure source flow path 13 opened corresponding to the first to fourth ports 5 to 8, an actuator-side output / return flow path 14, 15 and a discharge flow path 16. I have. The pressure source flow path 13 is connected to the first port 5 by an actuator-side output / return flow path 14.
, 15 are connected to two ports 61, 62 on the output side and the return side, and the third and fourth ports 7, 8 are connected to the discharge flow path 16 via the communication path 10. On the other hand, on the outer periphery of the land 17 that opens and closes the first port 5 of the spool 3, there is provided a step 18 that forms a small-diameter lubricating passage. In this case, a predetermined amount of oil from the pressure source is supplied to the second port 6 side, and is constantly supplied to the actuator 9 through the second port 6 and the actuator-side flow path 14. On the other hand, the solenoid 4 has a rod 20 having one end connected to a plunger 19 as an internal movable core, the other end protruding into the valve sleeve 2, and a protruding end operatively connected to the spool 3. The solenoid 4 includes a core 21 functioning as a fixed iron core, a coil 22 disposed to surround the core 21, a case 23 in which the coil 22 is housed, and an open end of the case 23 closed. And a connector 24 to be connected. And core 2
1 has one end driven and arranged in the internal space of the valve sleeve 2, and the plunger 19 is reciprocally inserted into the space between the core 21 and the connector 24. The core 21 is provided with a passage 25 that communicates the internal space of the valve sleeve 2 with the internal space of the solenoid 4 into which the plunger 19 is inserted. On the other hand, the opening at the end of the valve sleeve 2 opposite to the solenoid 4 is closed by a plug 26, and the spool 3 is urged between the plug 26 and the spool 3 toward the solenoid 4. A spring 27 is mounted. In the solenoid valve having the above structure, the spool 3 is normally urged toward the solenoid 4 by the spring force of the spring 27, and the plunger 19 is
It is separated from 1. Then, the tip land portion 17 of the spool 3 is at a position where the first port 5 is closed. When the coil 22 is energized, the plunger 19 is magnetically attracted to the core 21 against the spring force of the spring 27, and the spool 3 moves to the distal end side of the valve sleeve 2 to open the first port 5, The port 5 communicates with the second port 6 to supply hydraulic pressure to the actuator 9 from the pressure source flow path 13, and drives and controls the actuator 9. The pressure supplied to the actuator 9 is adjusted by adjusting the amount of current supplied to the coil 22 to change the opening area of the first port 5. Then, when the power supply to the coil 22 is stopped, the spool 3 is pushed back to the original position by the spring force of the spring 27, the first port 5 is closed, the introduction of pressure to the actuator 9 is stopped, and the return side is returned. The gas is discharged from the second port 62 to the discharge channel 16 through the third port 7. At this time, the rod 20 is immersed in the solenoid 4 and the volume into which the rod 20 enters increases, and the oil as the stagnant fluid in the solenoid 4 passes through the passage 25 of the core 21 to the internal space of the valve sleeve 2. The fluid such as oil that flows in flows out of the discharge channel 16 through the fourth port 8 and the communication passage 10. in this way,
It is possible to integrate the return oil from the actuator 9 and the discharge flow path 16 for discharging the retained oil inside the solenoid 4. The land portion 17 of the spool 3 is located at a position where the first port 5 is closed when the coil 22 is off. However, since the step portion 18 is provided on the outer periphery of the land portion 17, the step portion 18 is provided. When the first port 5 and the second port 6 are in communication with each other and a small amount of oil is constantly supplied to the actuator 9, for example, the actuator 9 such as a valve timing control device of an internal combustion engine has a rotary bearing. In addition, lubrication of the bearing and the like can be achieved. FIG. 2 shows a solenoid valve according to another embodiment of the present invention. In this example,
A step portion 28 forming a lubrication passage is provided on the outer periphery of the valve sleeve 2 so that pressure oil always flows to the second port 6 through a gap between the outer periphery of the valve sleeve 2 and the inner periphery of the mounting hole 12 of the housing 11. is there. However, as shown in the illustrated example, a stepped portion 18 may be provided on the outer periphery of the land portion 17 of the spool 3 so as to supply the pressure oil from both the outer periphery of the spool 3 and the outer periphery of the valve sleeve 2, or provided independently. You may do so. As the lubrication passage provided on the outer periphery of the valve sleeve 2, a step 28 may be formed all around as shown in FIG. 3, or a slit groove may be partially formed as shown in FIG. 29 may be provided. Other configurations and operations are the same as those of the above-described embodiment, and therefore, the same components will be denoted by the same reference numerals and description thereof will be omitted. According to the present invention, a fourth port and a third port are provided on the outer periphery of the valve body.
By providing a communication path for communicating the port, the stagnant fluid in the solenoid and the return fluid from the controlled part can be discharged from one discharge path, so that the flow path configuration on the mounting partner member side can be simplified and manufactured. Becomes easier. Further, by arranging the fourth port for discharging the retained fluid in the solenoid between the solenoid and the spool, the fluid flows out of the fourth port directly without passing through the spool portion, and the resistance to the spool is reduced. Operation responsiveness can be improved. A lubrication passage communicating between the first port and the second port is provided on the outer periphery of the land portion of the spool or the outer periphery of the valve body, and the lubrication passage is always covered regardless of the opening and closing of the port due to the movement of the spool through the lubrication passage. Since the lubricating fluid can be supplied to the control unit, the lubrication of the controlled unit is not interrupted even if the fluid such as hydraulic oil for the controlled unit is shut off as in the related art. It is always connected to the controlled part, and seizure of the bearing part of the controlled part can be prevented. Further, since the fluid is returned from the controlled part via the discharge passage, the controlled part does not malfunction, and since the fluid that functions as lubricating oil flows, the lubricating surface (sliding surface) Surface) also has a high cooling effect.

[Brief description of the drawings]   FIG.   FIG. 2 is a longitudinal sectional view of the solenoid valve according to the embodiment of the present invention.   FIG. 2   FIG. 4 is a longitudinal sectional view of a solenoid valve according to another embodiment of the present invention.   FIG. 3   FIG. 3 is a view in the direction of arrow A in FIG. 2.   FIG. 4   FIG. 4 is a diagram showing another embodiment of FIG. 3.   FIG. 5   It is a longitudinal section of the conventional solenoid valve.   [Explanation of symbols]   1 Solenoid valve   2 Valve sleeve   3 spool   4 Solenoid   5 First port   6 Second port   7 Third port   8 4th port   9 Actuator 10 connecting passage 11 Mating housing 12 mounting holes 13 Pressure source flow path 14 Actuator output flow 15 Return channel on actuator side 16 discharge channel 17 Land 18 steps (lubrication passage) 19 plunger 20 rods 21 core 21 coils 23 cases 24 Connector 25 passage 26 plug 27 Spring 28 step (lubrication passage) 29 Slit groove (lubrication passage)

Claims (1)

Claims: 1. A utility model registration claim 1. A solenoid, a hollow valve body integrally assembled with the solenoid, a spool slidably inserted into the valve body, and one end of the solenoid A rod connected to a plunger functioning as an internal movable core and having the other end protruding into the valve body and operatively connected to a spool; wherein the valve body has a first port on a fluid supply source side; A second port on the controlled part side;
Inserting a third port for discharging the return fluid from the control unit, and a fourth port for discharging the staying fluid in the solenoid, set only a said valve body to the peripheral mounting portion of the mounting mating member And connecting the first to fourth ports to a flow path provided in a mounting member that opens corresponding to each port ;
An electromagnetic valve for opening and closing a first port on a fluid supply source side by energizing / de-energizing a solenoid, wherein the fourth port is located between a spool and a solenoid, and the fourth port and the fourth A communication path for communicating the three ports is provided, and the discharge flow path on the other side of attachment is integrated into one, and the peripheral surface of at least one of the land portion of the spool and the valve body is provided on the peripheral surface of the valve body.
A lubrication passage communicating between the first port and the second port is provided, and
The lubricating fluid is always supplied to the controlled part through the lubrication passage,
Solenoid valve characterized in that it can be supplied .