JPS601336Y2 - Oil-immersed hydraulic solenoid valve - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an oil-immersed hydraulic solenoid valve.

In a solenoid valve, it is desirable to control the operating speed of the spool in order to prevent impact.

In the so-called dry type, which is not an oil-immersed type, a damper chamber is provided between the spool and the movable iron core to control the operating speed of the spool.

In addition, oil-immersed solenoid valves have been put into practical use that control the operating speed of the spool by providing a throttle in the movable core itself.
That is, the speed is controlled including the fuwazai portion, which is not preferable.

The purpose of this invention is to provide an oil-immersed hydraulic solenoid valve in which the movement of a movable core driven by electromagnetic force from an electromagnetic coil in an oil-immersed chamber is transmitted to the spool via a bushing pin. By simply using a spool that has been given a An object of the present invention is to provide an oil-immersed hydraulic solenoid valve that can obtain a shockless effect without reducing responsiveness.

In an oil immersion type hydraulic solenoid valve, an oil chamber connected to a tank port in the solenoid valve body is slidable in an oil immersion chamber separated by a wall, and a portion of the oil immersion chamber is divided into a chamber on the tip side closer to the wall. A movable iron core is arranged so that the movable iron core is driven by electromagnetic force from an electromagnetic coil, and the movement of the movable iron core is controlled by a bushing pin that passes through the wall and is connected to a spool located in the oil chamber in the solenoid valve body. The valve seat of the spool is opened and closed by transmitting the signal to the end of the valve.

In the oil-immersed hydraulic solenoid valve according to the present invention, an oil passage is provided on each central axis of the movable iron core and the bushing pin and passes between both end faces thereof, and the oil passage opening is provided on the tip face of the movable iron core. The tail end of the bushing pin is slidably fitted to the end, and in this case, when the tail end of the bushing pin is fully fitted into the oil passage opening end of the front end surface of the movable core, the bushing pin is slidably fitted into the front end side chamber. The oil passage opening end is closed by a bushing pin, and when the bushing pin is not fully fitted, the oil passage opening end is opened to the tip side chamber, and the oil passage opening end on the tip side of the bushing pin is closed. The port is closed by contact with the end face of the spool, and the bushing pin is provided with a radial throttle hole at a position in the oil chamber to communicate the oil chamber with an oil passage in the bushing pin, and further, A relief groove is provided on the outer circumferential surface of the push pin at the portion that passes through the valve, which communicates the oil chamber and the tip side chamber with a flow path area that is smaller than the throttle hole. It is a distant relative that the movable iron core is moved quickly in the valve part, and that the valve's original operating stroke part is given speed control to the movable iron core in order to cushion the impact.

In one embodiment of this invention, the length of the relief groove is determined so as to cut off communication between the oil chamber and the tip side chamber at the time when the spool pressed by the bushing pin starts its operation. The bushing pin is further provided with another radial throttle hole that communicates the tip side chamber with the bushing pin internal oil passage.

The oil-immersed hydraulic solenoid valve according to this invention will be described below with reference to drawings of embodiments.

FIG. 1 is a longitudinal sectional view of one embodiment of the solenoid valve according to this invention.

Reference numeral 1 denotes a valve body, which has a chamber T communicating with a tank port on both sides, and chambers A and B communicating with a supply port P and an actuator port in the center.A spool 4 is slidable in the center. A valve seat is formed on the sliding surface of 4.

Actuator ports 19a and 19b communicate with the actuator.

Although the supply port and tank port are not shown in the drawing, they are connected to an oil supply device and an oil tank, respectively.

In FIG. 1, this valve is shown in its neutral state, ie, the chambers (A and B) communicating with the actuator are closed by the spool 4.

The outside of the T chamber is closed by a fixed iron core 20.20' excited by electromagnetic coils 2 and 3, and the fixed iron core 20.20' is
It forms the walls of the room.

Also, a spring 10.10' inserted between the spring receivers 9.9' provided on both sides of the spool 4 and the fixed iron core 20.20'
As a result, the spool 4 is kept in a neutral state.

Movable cores 5, 6 are slidably provided within the oil immersion chamber, dividing the chamber into chambers 11.13 and 11', 13'.

Penetrate the fixed core 20.20' between the oil immersion chamber and the T chamber,
A bushing pin 7.8 is provided to align the axes of the spool 4 and the movable iron cores 5, 6.

Electromagnetic coils 2 and 3 are provided around the outer periphery of the oil immersion chamber.

When any of the electromagnetic coils 2.3 is energized, the movable core 5.6 and the fixed core 20.20' are energized, and the movable cores 5 and 6 are attracted to the fixed core 20.20' and slide inside the oil immersion chamber. Move, push pin 7.8, spool 4
is slid against the force of spring 10, 10' to open and close the valve seat.

In the solenoid valve according to this invention, Bushpin 7.8
The movable iron cores 5 and 6 can be freely fitted into recesses 5a and 6a at the center thereof.

Also, an oil passage 12 passing through the movable iron core 5.6 and the bushing pin 7.8 between both end surfaces thereof on their central axes.
, 12' and 18.18' are provided.

17 and 17' are ports for oil passages 18 and 18'.

Furthermore, the bushing pin 7.8 is provided with a throttle hole 16.16' which opens into the T chamber and communicates with the passage 18.18'.

In addition, the bush pin 7.8 is provided with leads 14, 14' that communicate the oil immersion chamber 13, 13' and the T chamber, and the rear end of the bush pin 7.8 (the part farther from the center of the valve is called the rear end) .

), the oil immersion chambers 13, 11 and 13' in front and rear of the movable cores 5, 6 are inserted into the oil immersion chambers 13, 11 and 13' before and after the bushing pins 7.8 are fitted into the recesses 5a, 6a of the movable cores 5, 6 and are fully fitted.
and 11' are provided to allow the oil to flow through the oil passages 12.degree. 12' of the movable iron cores 5, 6.

The steps 14, 14' and 15, 15' will be explained in more detail with reference to FIG.

The bushing pin 7.8 passes through the fixed core 20.20' that forms the wall of the T chamber, but it has been machined and finished so that the two are in close contact with each other as long as they can slide. Without it, it would be difficult for oil to flow through the gap between the two.

Due to the movement of the movable cores 5 and 6, the front chamber 13.13 of the oil immersion chamber
In order to smoothly change the volume of 'Butushupin 7.
8 is provided with recesses R14, 14' such as cutouts shown in FIG. 6 so as to communicate the T chamber and the chambers 13, 13' over the entire range of movement.

In addition, the bushing pin 7.8 is a concave portion 5a of the movable iron cores 5, 6.
, 6b are also machined and finished so that they are in close contact with each other in the same way as described above, so if there is no advance 15.15', when the two begin to fit, both the front and rear oil immersion chambers 13 and 11 or 13' and 11'
The flow of oil between the chambers 11, 11' is prevented, and the oil in the chambers 11, 11' flows exclusively into the T chamber through the oil passages 12, 18 or 12'18' and the throttle holes 16 or 16', and the flow is controlled as described below. In order to avoid this, reliefs R15 and 15' such as cutouts shown in FIG. 6 are provided.

When the bushing pin 7.8 and the recessed portions 5a, 6b are fitted, the pressing surfaces are in close contact with each other, so that both chambers 13 and 11 or 13' and 1
The flow of oil between 1' is prevented.

Next, the operation of the electromagnetic valve of this invention will be explained.

FIG. 2 is a longitudinal sectional view similar to FIG. 1, with some parts omitted, showing a transient state when the electromagnetic coil 2 of the electromagnetic valve shown in FIG. 1 is energized.

When the electromagnetic coil 2 is energized, the movable core 5 moves the bushing pin 7, spool 4, bushing pin 8, and movable core 6 to the left in the drawing against the force of the spring 10'.

At this time, oil is supplied to the chamber 11 from the T chamber through the throttle hole 16 and the oil passages 18 and 12, and the oil in the chamber 11' is supplied to the passage 12.
' and 18' are discharged into the T chamber through the throttle hole 16'.

Since the above-mentioned oil flow is suppressed by the throttle holes 16 and 16', the operating speed of the movable core 5 and therefore the spool 4 is limited, and chambers A and B gradually open at the limited speed.
Oil gradually flows from the P chamber to the A chamber and from the B chamber to the T chamber to prevent shock.

Further, since the chambers 13 and 13' are communicated with the T chamber through the escape grooves 14 and 14', they are not involved in controlling the operating speed of the spool 4.

The operating speed of the spool 4 is determined by the diameter of the throttle hole 16° 16', so the diameter of the throttle hole 16 to obtain the desired operating speed is
, 16' are selected based on actual results, experiments, etc.

When the electromagnetic coil 2 is electromagnetic, the spool 4 is pushed back by the force of the spring 10', and the operating speed of the spool 4 is controlled by the chamber 11.
This is similarly controlled by discharging the oil through the throttle hole 16 into the T-chamber at a limited speed.

When the electromagnetic valve of this invention is arranged vertically as shown in FIG. It is desirable to bring the bushing pin B into contact with the spool 4 immediately without controlling the speed of the movable iron core 6 until the spool 4 starts operating upon contact with the bushing pin B.

In the solenoid valve of this invention, in such a state, the oil passages 18' and 12' are connected to the port 17' and the throttle hole 16' to the 11'.
Since oil is supplied from the T chamber through the chamber 13' and oil is supplied from the T chamber to the chamber 13' from the advance 14', the movable iron core 6 quickly spools the bushing pin 8 without having its speed controlled. 4 can be brought into contact.

After the bushing pin 8 and the spool 4 come into contact, the port 17 is closed by the end of the spool 4, and the chamber 11' has a throttle hole.
Since only the oil passing through 6' is supplied, the speed of the movable iron core 6, that is, the spool 4, is controlled, and impact prevention can be effectively achieved.

In the case of demagnetizing the electromagnetic coil 3, the spool 4
The speed of is controlled.

FIG. 4 is a partial cross-section showing a state in which the spool 4 and the bushing pin 8 are in contact with each other in the solenoid valve of this invention, but the bushing pin 8 is not completely fitted into the recessed portion of the movable iron core 6.

Even in such a case, it is desirable that the speed of the movable core 6 is not controlled until the push pin 8 is completely fitted into the movable core 6.

In the solenoid valve of this invention, a relief 415.15' is provided at the rear end of the bushing pin 7.8.

When the bushing pin 7.8 is separated from the movable cores 5, 6, the front and rear chambers 13 and 11 and 13' and 11 of the oil immersion chamber are communicated through an oil passage 12,12'.

When the bushing pins 7.8 begin to fit into the movable cores 5, 6, the oil passages 12, 12' are closed at the entrance of the front chamber 13, 13' of the oil immersion chamber. ．．
15' is provided, the front and rear chambers of the oil immersion chamber are communicated through the oil passages 12° and 12' until the fitting between the bushing pins 7.8 and the movable cores 5 and 6 is completed, and the movable cores 5 and 6 are connected. It can move without limiting its speed.

Of course, when the front and rear fitting is completed, the entrance of the oil passages 12, 12' on the front chamber 13, 13' side of the oil immersion chamber is closed by the end of the bushing pin 7.8.

FIG. 5 shows another embodiment of the electromagnetic valve according to this invention in a sectional view of the main parts.

The solenoid valve according to this embodiment differs from the solenoid valve shown in FIGS. 1 to 4 in the structure of the bushing pin.

In the solenoid valve of this embodiment, the bushing pins 7a, 8
The advance chambers 14a and 14'a, which connect the oil immersion chamber (front chamber) 13.13' provided in a and the T chamber, are Bushpin 7a,
8a presses the spool 4 and starts its operation (FIG. 5 shows the state at this point).

) is shortened to prevent this communication.

The bushing pins 7a, 8a also have throttle holes 21. which open into the oil immersion chamber 13.13' and communicate with the oil passage 18.18'.
21' is bored.

In the solenoid valve of this embodiment, from the time when the spool 4 starts operating, there is a flow 1 between the oil immersion front chambers 13, 13' and the T chamber.
4a and 14a' are closed, and oil flow between the two chambers is performed via throttle holes 16, 16' and 21, 21',
In addition, since oil flows between the front and rear oil immersion chambers 13 and 11 and 13'll' through the throttle hole 21.21', the front and rear oil immersion chambers are integrated into the movable iron cores 5, 6, i.e. Spool 4
involved in speed control.

The electromagnetic valve according to this invention is constructed and operates as described above, so that the shock can be alleviated by simple parts replacement or processing, and the movable iron core can be moved quickly in the unfavorable zone until the spool operates. Dogs have industrial value because they can do this.

[Brief explanation of the drawing]

1. Each of the drawings shows an embodiment of the solenoid valve and its parts according to this invention. 1 to 4 are whole or partial longitudinal sectional views of one embodiment, and the first
The figure shows the spool in a neutral state, Figure 2 shows a transient state of spool operation, Figure 3 shows a state where the spool and bushing pin are separated, and Figure 4 shows a state where the bushing pin is completely fitted into the recess of the movable core. It shows no condition. FIG. 5 is a vertical cross-sectional view of a main part of another embodiment. FIG. 6 is a perspective view of the bush pin. In the drawing, 1 is the main body, 2 and 3 are electromagnetic coils, 4 is a spool, 5 and 6 are movable iron cores, 7 and 8°7av8a are bush pins, 13.13' and 11.11' are the front chamber of the oil immersion chamber, and Rear chamber, 12, 12', 18.18' are oil passages, 1
4.14', 14a, 14a', 15. 15
'is Shinko, 16,16'. 20.20' is a fixed core, and 21.21' is a throttle hole.

Claims (2)

[Scope of utility model registration request] (1) The oil chamber connected to the tank port in the solenoid valve body is slidable in an oil immersion chamber separated by a wall, and inside the oil immersion chamber, a chamber on the tip side near the wall and a chamber on the tail end side away from the wall A movable iron core is disposed so as to be part of the chamber, and the movable iron core is driven by electromagnetic force from an electromagnetic coil, and the movement of the movable iron core is controlled by a bushing pin penetrating the wall to the oil chamber in the solenoid valve body. In an oil-immersed hydraulic solenoid valve that opens and closes the valve seat of the spool by transmitting a signal to the end of the spool located at the end of the spool, an oil passage is provided on each central axis of the movable core and the bushing pin, and extends between both end surfaces of the movable iron core and the bushing pin. is provided, and the tail end of the bushing pin is slidably fitted to the oil passage opening end on the front end surface of the movable core, and in this case, the tail end of the bushing pin is fully fitted into the oil passage opening end on the front end surface of the movable core. When fully fitted, the oil passage opening end is closed to the tip side chamber by a bushing pin, and when the oil passage opening end is not fully fitted, the oil passage opening end is opened to the tip side chamber. The oil passage opening end port on the tip face of the bushing pin is closed by contact with the end face of the spool, and the bushing pin has an oil passage in the oil chamber and the bushing pin at the position in the oil chamber. A radial throttle hole is provided for communication between the oil chamber and the tip side chamber, and an escape groove is provided on the outer circumferential surface of the bushing pin at a portion that penetrates the wall, and that communicates the oil chamber and the tip side chamber with a flow path area larger than that of the throttle hole. An oil-immersed hydraulic solenoid valve characterized by: (2) the length of the escape groove is determined so as to cut off communication between the oil chamber and the tip side chamber at the time when the spool pressed by the bushing pin starts its operation;
Further, the bushing pin is provided with another radial throttle hole that communicates the tip side chamber with the oil passage inside the bushing pin, the oil-immersed type hydraulic pressure according to claim 1 of the patented utility model claim. solenoid valve.