JPH0722542Y2 - Solenoids and solenoid valves - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a solenoid and a solenoid valve used for a control valve of a hydraulic / pneumatic device, for example.

(Prior Art) As a conventional solenoid, there is, for example, one shown in FIG. That is, 100 is a cylindrical solenoid body in which a hollow plunger chamber 101 is formed on the inner peripheral side, and a plunger 102 made of a magnetic material is provided in the plunger chamber 101.
Are accommodated along the inner peripheral wall 101B of the plunger chamber so as to be reciprocally movable in the axial direction. On the other hand, a spring 104 is interposed on one end side of the plunger 102 housed in the plunger chamber 101, and the plunger 102 is pressed against the end wall 101A on one side of the plunger chamber 101 by the urging force of the spring 104.

When the solenoid body 100 is energized, the plunger 102 is moved by the electromagnetic attraction force against the biasing force of the spring 104, and when the solenoid body 100 is de-energized, the spring force of the spring 104 causes the plunger 102 to move. 1
02 is designed to return to its original position.

When the plunger 102 is returned, the plunger 102 is pushed by the spring force of the spring 104 to the plunger chamber end wall 101A.
However, the impact force at the time of the collision is
The oil O accumulated in the oil reservoir 105 between the end wall 101 and the end wall 101A is buffered by the damper action.

(Problems to be solved by the invention) However, in the above-described conventional technique, the damper action causes the oil O accumulated on the far end side of the plunger 102 to flow out into the gap between the plunger 102 and the plunger chamber inner peripheral wall 101B. It is absorbed by the flow path resistance of the gap.

However, the gap may widen due to the variation in the dimensional accuracy of the plunger 102, the flow path resistance decreases, and the oil flows out without resistance when the plunger 102 returns,
There was a problem that the damper effect was significantly diminished.

Therefore, it is necessary to manage the dimensional accuracy of the plunger 102 with high accuracy.However, the length of the plunger 102 is long, and the accuracy may be poor at other positions, but the accuracy may be poor at other parts. And the production efficiency becomes worse.

Further, if the gap between the plunger 102 and the plunger chamber inner peripheral wall 101B is made small, it becomes difficult to insert the plunger 102 into the plunger chamber 101 at the time of forcibly assembling, and the assembling property deteriorates.

The present invention was made in order to solve the above-mentioned problems of the prior art, and its purpose is to prevent impact at the time of collision between the plunger and the end wall of the solenoid body without increasing the dimensional accuracy of the plunger. An object is to provide a solenoid and a solenoid valve that can absorb efficiently.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a solenoid according to the present invention is provided with a hollow solenoid body and a reciprocating movable body inside the solenoid body along an inner peripheral wall of the solenoid body. A plunger provided, an urging means for urging the plunger to one side in the moving direction to press it against an end wall in the solenoid body, an outer periphery of the plunger allowing the flow of fluid on both end surfaces of the plunger, and the solenoid body. The solenoid main body has a gap between the inner peripheral walls and a fluid reservoir for buffering between the one end face side of the plunger and the end wall inside the solenoid main body, and has a larger diameter than the plunger on the outer periphery of the plunger. It is characterized in that a sleeve that comes into contact with the inner peripheral wall is partially fitted.

Also, a solenoid valve according to the present invention is characterized in that it has the solenoid described above and is provided with a valve body that is controlled to be opened and closed by reciprocating operation of a plunger of the solenoid.

(Operation) In the solenoid having the above configuration, the plunger moves against the biasing force of the biasing means by the electromagnetic attraction force of the solenoid body. On the other hand, when the solenoid main body is de-energized, the plunger moves to the end wall side in the solenoid main body by the biasing force and collides with the end wall. At that time, the fluid in the fluid reservoir flows out through a minute gap that is a minute gap when a sleeve with a diameter larger than the plunger is fitted to the outer circumference of the plunger to allow the fluid flow on both end surfaces of the plunger. The shock is buffered by the road resistance.

At the time of processing, the dimensional accuracy of the outer circumference of the sleeve is managed with high accuracy. However, the sleeve is partially fitted to the plunger, the length is shorter than that of the plunger, and the dimensional accuracy is easy to manage. Further, even if the gap between the sleeve and the inner circumference of the solenoid body is small, the sleeve portion is short at the time of assembly, so that it can be easily inserted into the inner circumference of the solenoid body.

On the other hand, in the solenoid valve configured as described above, the operating noise during the opening / closing control is reduced.

(Example) Below, this invention is demonstrated based on the Example shown in figure. First
1 and 2 show a solenoid valve to which a solenoid according to an embodiment of the present invention is applied. In the drawing, reference numeral 1 denotes the entire valve, which is generally composed of a valve body 2 and a solenoid body 3 according to an embodiment of the present invention which is integrally assembled with the valve body 2.

The solenoid body 3 is housed in a cylindrical case 4, and the valve body 2 is attached to one end face of the solenoid body 3. A plunger chamber 31 is provided inside the hollow of the solenoid body 3.
The plunger 5 is mounted in the plunger chamber 31 so as to be reciprocally movable in the central axis direction, and a fixed iron core 6 is fixedly fitted to the end portion on the valve body 2 side. A valve chamber 7 is formed between the fixed iron core 6 and the valve body 2.

The fixed iron core 6 is provided with a through hole 8 penetrating in the central axis direction, and a cylindrical valve body 9 is guided and held via an annular guide member 10 so as to be movable in the central axis direction. This valve body 9
Is fixed to the plunger 5 in the plunger 31 and the other end is inserted into the valve chamber 7. On the other hand, a valve seat 11 is provided on the valve body 2 side so as to face the valve body 9.

A spring 12 as a biasing means is mounted in a compressed state between the plunger 5 and the guide member 10 of the fixed iron core 6 to constantly bias the valve body 9 in a direction away from the valve seat 11. ing. Further, the valve body 9 is provided with an introduction path 13 for introducing the control fluid in the valve chamber 7 into the plunger chamber 31, and the fluid is passed through the gap between the plunger 5 and the plunger chamber inner peripheral wall 31a to the rear side of the plunger 5. It is designed to be turned into the fluid pool 20. A back pressure in the valve closing direction is applied to the plunger 5 by this fluid pressure to balance the fluid pressure in the valve opening direction acting on the valve body 9 in the valve chamber 7.

The plunger 5 is a columnar member, and a sleeve 21 that comes into contact with the inner peripheral wall surface 31a of the plunger chamber 31 is partially fitted on the outer periphery thereof. The sleeve 21 is a flat cylindrical ring member, and the mounting position of the sleeve 21 is the fluid pool of the plunger 5.
It is the end position on the 20 side. The plunger 5 reciprocates along the inner wall 31 a of the plunger chamber via the sleeve 21.

The outer diameter d ₀ of the plunger 5 is formed to be smaller than the inner diameter D of the plunger chamber 31, and a gap g ₀ is formed between the outer periphery of the plunger 5 and the inner peripheral wall surface 31a of the plunger chamber 31 to provide a loose fit state. There is.

On the other hand, the outer diameter d ₁ of the sleeve 21 is larger than the outer diameter d ₀ of the plunger 5 and slightly smaller than the inner diameter D of the plunger chamber 31, and the sleeve 21 and the inner peripheral wall surface 31 of the plunger chamber 31.
A minute gap g ₁ is formed between a and a. Through this minute gap g ₁ , a fluid such as oil can flow between the valve body side and the oil sump 20 side.

The minute gap g ₁ on the sleeve 21 side is smaller than the gap g ₀ between the plunger 5 and the inner wall surface 31a of the plunger chamber, and the outer diameter of the sleeve 21 is controlled with high accuracy.

On the other hand, the valve body 2 is provided with first and second flow paths 14, 15 penetrating between the valve chambers 7 from the outside. First channel 14
Is formed so as to penetrate along the central axis, while the second
The flow paths 15 are formed in parallel with each other with the first flow path 14 interposed therebetween. A valve seat 11 configured separately from the valve body 2 is provided at the opening of the first channel 14 on the valve chamber 7 side.

Reference numeral 16 is a connection terminal for energizing the solenoid body 3, and 17 is a seal member for sealing the valve mounting portion.

The solenoid valve operates as follows. It is assumed that the control fluid flows in from the second flow path 15 and flows out from the first flow path 14.

First, when the valve is closed, the solenoid body 3 is energized, the plunger 5 is attracted to the fixed iron core 6 side by the electromagnetic attraction force, and the plunger 5 resists the spring force of the spring 12.
Moves toward the fixed iron core 6 side, and the valve body 9 is in close contact with the valve seat 11.

Next, when the valve is opened, the power supply to the solenoid body 3 is cut off. Then, the plunger 5 moves to the fluid reservoir 20 side at the inner end of the plunger chamber 31 by the spring force of the spring 12, and the valve body 9 separates from the valve seat 11 to open the valve. Then, the plunger 5 is inserted through the stopper 22 into the end wall 32 of the plunger chamber 31.
Clash with. At that time, as shown in FIG. 2, the fluid F in the fluid reservoir 20 flows out through the minute gap g ₁ between the sleeve 21 and the plunger chamber inner peripheral wall 31a. The impact at the time of collision is buffered by the flow path resistance when passing through the minute gap g _1, and the impact sound between the plunger 5 and the solenoid body 3 is reduced.

The outer diameter of the sleeve 21 is controlled with high accuracy,
It is possible to enhance the damper effect by making the minute gap g ₁ as small as possible.

The damper action is mainly influenced by the minute gap g _{1 on the} outer circumference of the sleeve 21, and is not so affected by the size of the gap g ₀ on the plunger 5 side. Therefore, the dimensional accuracy of the plunger 5 is not so required, and the plunger 5 can be easily processed.

In this embodiment, the solenoid valve in which the valve body and the solenoid are integrally assembled has been described, but the solenoid and the valve body are configured as separate bodies, and the solenoid plunger and the valve body are separate bodies, and the solenoid is used as an actuator. You may use it.

Further, the solenoid of the present invention is not limited to being applied to a valve, but may be applied to other control mechanisms such as a clutch mechanism.

(Effect of the Invention) The present invention has the above-described configuration and operation. A small gap is formed by fitting a sleeve having a diameter larger than that of the plunger to the outer circumference of the plunger. Therefore, when the plunger moves toward the end wall side in the solenoid body and collides with the end wall due to the urging force, the fluid in the fluid pool provided on the one end face side of the plunger should flow out through the minute gap. become. As a result, the flow path resistance increases, and the shock is reliably buffered by the increased flow path resistance. In addition, since a sleeve that fits partially on the outer circumference of the plunger is provided, the impact sound can be effectively absorbed even if the sleeve is processed with high accuracy, and the processing accuracy of the plunger is not required and the production efficiency is improved. Can be increased.

Further, since only the sleeve is in contact with the inner peripheral wall of the solenoid body, the assembling property can be improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a solenoid valve according to an embodiment of the present invention, and FIG. 2 is a schematic enlarged view schematically showing a fluid outflow state at a rear end portion of a plunger when the solenoid valve of FIG. 1 is opened. FIG. 3 is a schematic vertical sectional view of a conventional solenoid valve. Explanation of symbols 1 ... Solenoid valve, 2 ... Valve body 3 ... Solenoid body, 31 ... Plunger chamber 31a ... Inner peripheral wall, 32 ... End wall 5 ... Plunger, 6 ... Fixed iron core 7 ... Valve chamber, 8 ... Through hole 9 ... Valve body 12 ... spring (biasing means) 20 ... fluid reservoir, 21 ... sleeve D ... plunger chamber inner diameter, d ₀ ... plunger outer diameter d ₁ ... sleeve outer diameter, g ₀ ... gap g ₁ ... small gap

Claims (2)

[Scope of utility model registration request] 1. A hollow solenoid body, a plunger provided inside the hollow hollow body of the solenoid body so as to reciprocate along an inner peripheral wall of the solenoid body, and a solenoid biasing the plunger toward one side in a moving direction. An urging means for pressing against the end wall in the main body, a gap between the outer circumference of the plunger and the inner peripheral wall of the solenoid main body that allow the flow of fluid on both end surfaces of the plunger, and one end surface side of the plunger and the solenoid are provided. In a solenoid having a buffer fluid pool between itself and an end wall of the main body, a sleeve having a diameter larger than that of the plunger and contacting the inner peripheral wall of the solenoid body is partially fitted to the outer circumference of the plunger. Characteristic solenoid. 2. A solenoid valve having the solenoid according to claim 1 and having a valve body that is controlled to open and close by reciprocating operation of a plunger of the solenoid.