JPH0135988Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a colenoid type solenoid valve used as a hydraulic valve.

Recently, an electromagnetic actuator called a colenoid type, which is a modified version of a conventional solenoid, has been announced.

In other words, its configuration is that of the right half of FIG. 1, and its configuration is as follows:
To the piston 3 fitted to the stator 2,
It has a structure in which one end of an armature 4 which is shaped like a step and widened in diameter like a skirt is fitted.

This collenoid type electromagnetic actuator is characterized in that even though it has a small configuration, the force for operating the piston 3 is very strong.

Therefore, this colenoid type electromagnetic actuator has the potential to be used to operate hydraulic valves at high speed.

However, such a colenoid type electromagnetic actuator cannot be directly applied to a hydraulic valve.

This is because, as explained above, the armature 4 is supported in a cantilever manner with respect to the piston 3.
There is a bending moment resulting from the weight of
Therefore, if the piston 3 is directly connected to a hydraulic valve as it is, the following problems will occur, making it unusable.

In other words, in order for the hydraulic valve to operate at high speed,
The valve must be able to slide smoothly, but as mentioned above, when subjected to bending moment from the piston 3, the valve tends to become distorted, and as a result, the valve slides smoothly. Resistance also increases, and the hydraulic valve becomes unable to operate at high speed.

This results in the hydraulic valve as a whole having a sluggish operation even though a high-speed colenoid type electromagnetic actuator is used.

An object of the present invention is to provide a high-speed response collenoid type solenoid valve that effectively takes advantage of the advantages of a collenoid type electromagnetic actuator in order to address the above-mentioned problems.

The present invention will be described below based on examples.

FIG. 1 shows a side sectional view of a colenoid type solenoid valve as an embodiment of the present invention.

A stator 2 is fixedly installed in the case 1, and a cylinder 2d is bored in the radial center of the stator 2. A piston 3 is fitted into the cylinder 2d so as to be able to slide in the axial direction. The piston 3 is biased to the left by a spring 3b.

On the radial outer periphery of the stator 2, coils 2a, 2b, and 2c are respectively encased in a shape in which the diameter increases stepwise in the axial direction.

The armature 4 has coils 2a, 2b and 2
The stator 2 is wrapped in a skirt shape similar to the step-like shape, which is arranged in a step-like shape, and forms the radial outer circumference of the stator 2 and goes around the circumferential direction. However, the left end of the armature 4 in the axial direction is fitted to the left end of the piston 3, and the end face 3c at the left end of the piston 3
has a convex spherical shape.

A body 6 is screwed into the case 1, a valve body 7 is fitted into the body 6, and a chamber 6a is fitted into the body 6.
An outlet hole 6b communicating with the body 6 is formed, an inlet hole 6c formed in the body 6 communicates with a port 7d formed in the valve body 7, and the inlet hole 6c is connected to a high pressure oil flow (not shown). connected to the road.

A cylinder 7a is bored in the valve body 7 in the axial direction,
A port 7d is open in the cylinder 7a,
The right end of the cylinder 7a forms a port 7b that selectively opens into the chamber 6a.

A valve 5 is fitted into the cylinder 7a to allow sliding movement in the axial direction, and the valve 5 is configured to close the port 7b when energized to the left in the axial direction.
The right end surface 5a has a planar shape in a direction perpendicular to the axial direction, and the valve 5 is biased to the right by a spring 7c.
Moreover, the end surface 5a is pressed against the end surface 3c of the piston 3.

The operation of the above configuration will be explained below.

When the coils 2a, 2b, and 2c are not energized, no attractive force is generated in the stator 2, so the valve 5 is moved to the illustrated position via the piston 3 by the biasing force of the spring 3b. Forced,
As a result, valve 5 closes port 7b.

On the other hand, when current is applied to the coils 2a, 2b and 2c, an attractive force is generated in the stator 2,
The armature 4 is attracted in the direction of the stator 2 in its axial direction, and as a result, the armature 4 presses the flange 3a on the piston 3 to the right, causing the piston 3 to move to the right.

As the piston 3 moves to the right,
The valve 5 is moved to the right by the biasing force of the spring 7c, and the port 7b is opened.
As a result, the high-pressure hydraulic oil in the inlet hole 6c flows out to a drain (not shown) via the ports 7b and 7b, the chamber 6a, and the outlet hole 6b.

The solenoid-type solenoid valve of the present invention operates as described above, and its operation is capable of high-speed operation due to the following actions.

Since the armature 4 is configured to be supported in a cantilevered state on one end of the piston 3, the part of the armature 4 which is shaped like a step and spread out like a skirt is able to support the piston 3 by its gravity. However, since the valve 5 and the piston 3 are completely separated at the end surface 5a and the end surface 3c, the valve 5 is not affected by the bending moment that is occurring on the piston 3. It has become something that is not well received.

Therefore, the valve 5 is able to slide smoothly within the cylinder 7a without causing strain on the cylinder 7a.

As a result, the valve 5 operates smoothly and without twisting, and the operation of the valve 5 is , it becomes possible to operate in conjunction with the high-speed response.

Furthermore, in this case, even if the valve 5 and the piston 3 are completely separated, their movement in the axial direction is such that the valve 5 and the piston 3 are sandwiched between the springs 7c and 3b. In addition, since the biasing force of the spring 3b is set to be larger than the biasing force of the spring 7c, when no current flows through the coils 2a, 2b, and 2c, the valve 5 closes the port 7b and the coil When current flows through 2a, 2b, and 2c, the piston 3 moves to the right against the biasing force of the spring 3b. At this time, the valve 5 closes the port due to the biasing force of the spring 7c. It becomes possible to open the valve.

Here, the biasing force applied in the axial direction of the valve 5 does not necessarily have to be the biasing force by the spring 7c, and the biasing force may be based on hydraulic pressure or the like.

However, in this case, what is necessary is the valve 5
It is sufficient that the rightward biasing force applied to the spring 3b is smaller than the biasing force of the spring 3b.

Furthermore, since the end surface 3c has a convex spherical shape with respect to the end surface 5a which is a perpendicular plane, even if a bending moment is generated in the piston 3, mutual interference between the end surfaces 3c and 5a will not occur. It has become something that does not occur.

In addition, in the above description of the end faces,
It will be easily understood that the same result can be obtained even if the end surface 5a side is made into a convex spherical shape and the end surface 3c side is made into a planar shape.

As is clear from the above description, the colenoid type solenoid valve according to the present invention has the following effects.

That is, the piston 3 and the valve 5 are separated at the end faces 3c and 5a, the piston 3 and the valve 5 are sandwiched between the springs 3b and 7c, and the biasing force on the spring 3b is made larger than the biasing force on the spring 7c. By increasing the size, it is possible to construct a high-speed response collenoid type electromagnetic valve without causing any strain on the valve 5.

In addition, in the solenoid type solenoid valve of the present invention, when either one of the end surfaces 3c or 5a is made into a convex spherical shape and the other is made into a planar shape, the bending moment generated in the piston 3 is caused by the convex spherical surface. Since it is possible to effectively escape at the portion where the valve 5 and the cylinder 7a meet, straining between the valve 5 and the cylinder 7a hardly occurs.

[Brief explanation of the drawing]

FIG. 1 shows a side sectional view of a colenoid type solenoid valve as an embodiment of the present invention. The symbols used in the examples are as follows. 1: case, 2: stator, 2a, 2b and 2c: coil, 2d: cylinder. 3: Piston,
3a: flange, 3b: spring, 3c: end face. 4: Armature, 5: Valve, 5a: End face.
6: body, 6a: chamber, 6b: exit hole, 6c: entrance hole. 7: Valve body, 7a: Cylinder, 7b and 7
d: port, 7c: spring.

Claims (1)

[Claims for Utility Model Registration] 1 (a) A plurality of coils 2a, 2b, and 2c are provided on the radial outer periphery of the stator 2, the winding diameter of which increases stepwise in the axial direction. (b) A cylinder 2d is bored in the radial center of the stator; (c) A piston 3 is provided in the first cylinder to enable sliding movement in the axial direction. (d) A biasing force is applied to the piston from one side in the axial direction, and the other axial end of the piston is connected to the axial end of the stator. (e) a space around the radial outer periphery of the stator and the coils, the winding diameter of which increases in the stepwise manner; (f) The other end of the armature in the axial direction is fitted into the exposed portion of the piston. and, by fitting them together, the armature is configured to be supported by the piston.
In the configuration, the other end of the piston forms one end surface 3c, a valve body 7 is disposed on the other side of the one end surface in the axial direction, and the valve body is provided with a cylinder 7a, a piston-shaped valve 5 is fitted into the cylinder so as to be able to slide in the axial direction, and the one end of the cylinder is
forming a port 7b opening into chamber 6a, said valve, when pushed in said other direction, sitting in said port and closing said opening, thereby reducing the pressure flowing through said port; The valve is configured to stop the flow of oil, and a biasing force is applied to the valve from the other side in the axial direction, and the magnitude of the biasing force applied to the valve from the other side is equal to the magnitude of the biasing force applied to the valve from the other side. The biasing force is smaller than the biasing force of the first spring, and the one end surface 5a of the valve in the axial direction is in pressure contact with the one end surface 3c of the piston. Collenoid type solenoid valve. 2 End face 5a on one side in the axial direction of the valve 5
is pressed against one end surface 3c of the piston 3, either the end surface on the one side or the one end surface forms a plane perpendicular to the axial direction, and any of the above The collenoid type solenoid valve according to claim 1, wherein the other of the valves has a convex spherical end face. 3. The urging force applied to the valve 5 from the other side in the axial direction is applied by the spring 7c.
The collenoid type solenoid valve described in item 1 or 2.