JPH06213354A - Electromagnetically driven solenoid valve - Google Patents

Abstract

PURPOSE:To prevent generation of dislocation in the armature/shaft position relationship caused by the thrust reaction force applied from the valve side by furnishing a detention part where the base end face of an armature collides with the fixation part of a solenoid to be in detention relative to a control valve. CONSTITUTION:An electromagnetically driven solenoid valve device has a selector valve 1 where a control valve 3 is inserted in a valve housing 2, and a solenoid 4 is serially coupled with the housing 2. The solenoid 4 is structured so that one end of a shaft 7 stretching toward the control valve 3 is fitted by pressure in an armature 6 which is mobile in the axial direction with current feed to a solenoid coil 8. There the foremost face of the control valve 3 is positioned confronting the foremost face of the casing 5 and is allowed to serve as a detention part 27, and this is put as confronting while the gap X to a threaded part of casing 5 is equal to or smaller than the gap D between the armature 6 and a cover 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention opposes a thrust force generated by an electromagnetically driven solenoid against a restoring spring of a control valve to control a stroke position of the control valve in response to a change in a current value applied to the electromagnetically driven solenoid. The present invention relates to improvements in electromagnetically driven solenoid valves.

[0002]

2. Description of the Related Art Conventionally, an electromagnetically driven solenoid valve of this type has a switching valve 1 in which a control valve 3 is slidably housed in a valve housing 2 which is a fixed portion, as shown in FIG. , And an electromagnetically driven solenoid 4 arranged in series facing the switching valve 1.

The electromagnetic drive solenoid 4 is an armature 6
The shaft 7 is press-fitted or caulked against the shaft 7 (see FIG. 3).
(Indicates press-fitting means), and thrust thrust toward the A direction is generated in the armature 6 and the shaft 7 corresponding to the current value applied to the electromagnetic coil 8, and the thrust force is generated through the shaft 7. The thrust force is exerted on the control valve 3 on the switching valve 1 side.

In the above description, the armature 6 and the shaft 7 have a stroke range in the A direction by a gap dimension C between the end surface g of the casing 5 which is the fixed portion of the electromagnetically driven solenoid 4 and the tip surface h of the armature 6, and ,
In the B direction, there is a stroke range corresponding to the gap dimension D between the end surface i of the cover 9 and the base end surface j of the armature 6, and the mechanical stoppers E and E are provided between the casing 5 and the armature 6 and between the cover 9 and the armature 6, respectively. Forming F.

On the other hand, the control valve 3 in the switching valve 1 always abuts the tip of the shaft 7 on the electromagnetically driven solenoid 4 side by the restoring spring 10 interposed between the valve housing 2 and the valve housing 2. Has two annular grooves 13 and 14 communicating with the input port 11 and the output port 12, and through holes 15 and 16 are formed in the outer periphery of the control valve 3 so as to face the annular grooves 13 and 14. is there.

The through holes 15 and 16 are center holes 17 formed in the axial direction from the base end of the control valve 3.
Communicate with each other through the control valve 3
Through hole 15 of the annular groove 1 on the valve housing 2 side.
The variable orifice 18 is formed between the end face k of the control valve 3 and the end surface k of the control valve 3, and the through hole 16 is kept in communication with the annular groove 14 at all times.
Stroke of the shaft 7 while the spring force of the restoring spring 10 maintains a balance state with respect to the thrust thrust in the direction A acting on the armature 6 and the shaft 7 according to the current value applied to the electromagnetic coil 8 on the electromagnetic drive solenoid 4 side. While moving in the range (dimension C + dimension), they move together to control the opening area of the variable orifice 18 formed between the through hole 15 and the end surface k of the annular groove 13.

[0007]

However, in the above electromagnetically driven solenoid valve, the control valve 3 on the switching valve 1 side vibrates due to disturbance or the like, and the control valve 3 causes the electromagnetically driven solenoid 4 to vibrate. When a thrust reaction force in the B direction larger than the thrust thrust generated by the electromagnetic coil 8 is applied to the shaft 7 on the side, the armature 6 and the shaft 7 are pushed back together, and the base end surface j of the armature 6 is covered. There is a case where it is strongly pressed against the end surface i of 9.

In this case, the thrust reaction force from the control valve 3 side is the frictional force or the crimping of the contact surface between the base end surface j of the armature 6 and the end surface i of the cover 9 and the press-fitting surface m of the shaft 7 to the armature 6. The shaft 7 is supported by the strength of the portion, but when a thrust reaction force that overcomes the frictional force of the press-fitting surface m and the strength of the caulking portion is applied, the shaft 7 is pushed into the armature 6 and the space between the armature 6 and the shaft 7 is pushed. The deviation causes the characteristics of the electromagnetically driven solenoid valve to change.

That is, as shown in FIG. 4, for example, in a normal state, when the tip end surface h of the armature 6 hits the end surface g of the casing 5 and the mechanical stopper C in the A direction works, the shaft 7 of the shaft 7 is normal. If the tip of the shaft 7 must be in the position W, but the press-fitting surface m of the armature 6 and the shaft 7 are deviated by Δx, the tip of the shaft 7 moves to the position Y, and the control in contact with the shaft 7 is performed. This causes an inconvenience that the stroke amount of the valve 3 is insufficient by Δx and normal hydraulic pressure control cannot be performed.

Of course, in order to eliminate such inconvenience, it is necessary to make the coupling force between the armature 6 and the shaft 7 on the electromagnetic drive solenoid 4 side strong enough to overcome the thrust reaction force from the control valve 3 side. Good but
For that purpose, not only is it time-consuming to process, but also the diameter of the shaft 7 must be increased, so that the electromagnetically driven solenoid 4 is disadvantageously large in size.

Therefore, an object of the present invention is to provide a thrust reaction force larger than the coupling force from the control valve side without increasing the coupling force between the armature and the shaft in the electromagnetically driven solenoid section. It is an object of the present invention to provide an improved electromagnetically actuated solenoid valve of this kind which does not cause a displacement between the armature and the shaft.

[0012]

In order to achieve the above object, according to the present invention, a control valve is applied to a shaft which is press-fitted or caulked with an armature of an electromagnetically driven solenoid by a restoring spring, and the electromagnetically driven solenoid is driven. In an electromagnetically driven solenoid valve that controls the stroke position of the control valve in response to changes in the current value applied to the solenoid, the base end surface of the armature in the electromagnetically driven solenoid is at least the electromagnetically driven solenoid compared to the control valve of the switching valve. The locking portion is provided so that it is locked by hitting the fixed portion on the side or is locked by hitting the fixed portion before that.

[0013]

Thus, according to the present invention, when the armature and the shaft on the electromagnetically driven solenoid side are pushed back by the thrust reaction force applied from the control valve on the switching valve side, the base end face of the armature contacts at least the fixed portion. The locking part of the control will hit or lock the fixed part before that.

As a result, the thrust reaction force of the control valve is supported by the contact surface between the locking portion and the fixed portion of the control valve without acting on the joint portion between the armature and the shaft, and therefore the armature and The positional relationship between the shafts will not be displaced.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

As shown in FIG. 1, an electromagnetically driven solenoid valve according to an embodiment of the present invention includes a switching valve 1 in which a control valve 3 is slidably housed in a valve housing 2 which is a fixed portion. An electromagnetically driven solenoid 4 is arranged in series by screwing one end screw portion 5a of a casing 5, which is also a fixed portion, to the valve housing 2 of the switching valve 1 with a seal 19 interposed therebetween.

In the casing 5 of the electromagnetically driven solenoid 4, an armature 6 movably inserted in the axial direction,
A shaft 7 extending from the armature 6 toward the control valve 3 on the switching valve 1 side and an electromagnetic coil 8 surrounding the armature 6 are housed.

The shaft 7 is integrally connected to the armature 6 by means such as press fitting or caulking, and has a guide 21 at the base end of the casing 5 which is oil-tightly fitted via a seal 20. The cover 9 is fitted,
The armature 6 and the shaft 7 are slidably supported via bearings 22 and 23 provided in the casing 5 and the guide 21.

The electromagnetic coil 8 is a resin core 8a.
It is housed and wound inside, and a metal cylinder 24 is fitted on the inner surface of the resin core 8a.
The inner surface of 4 is in oil-tight contact with the casing 5 and the guide 21 with the seals 25 and 26 interposed therebetween.

As a result, the bearing 2 is filled with the hydraulic oil flowing from the switching valve 1 side to the electromagnetic drive solenoid 4 side.
2 and 23 are lubricated, and the hydraulic oil is applied to the valve housing 2 on the switching valve 1 side and the electromagnetic drive solenoid 4
The seal 19 prevents leakage from the outside between the casings 5 on the side.
In addition, the seals 20, 25 and 26 prevent leakage to the portion of the electromagnetic coil 8.

In the above, the resin core 8a
The metal cylinder 24 is fitted to the inner surface of the seal 2
When 5 and 26 are directly applied to the resin core 8a, the oil tightness thereof is deteriorated. Therefore, in order to prevent this, the metal cylinder 24
The oil-tightness was improved through the.

On the other hand, the control valve 3 of the switching valve 1 is slidably inserted into an axial valve hole 28 formed in the valve housing 2 and has a screw plug 29 for closing the base end opening of the valve hole 28. The restoring spring 10 interposed between the two always abuts the tip of the shaft 7 on the electromagnetic drive solenoid 4 side.

Annular grooves 13 and 14 are formed on the inner peripheral surface of the valve hole 28 in the valve housing 2, and these annular grooves 13 and 14 pass through the input port 11 and the output port 12 bored in the valve housing 2. It leads to the outside.

Further, through holes 15 and 16 are formed on the outer periphery of the control valve 3, and these through holes 15 and 16 are provided.
Communicate with each other through a central hole 17 formed in the axial direction from the base end of the control valve 3, and
The through hole 15 constitutes a variable orifice 18 whose opening area changes with the movement of the control valve 3 between the end surface k of the annular groove 13 on the valve housing 2 side, and
The through hole 16 is always kept in communication with the annular groove 14 during that time. As a result, the control valve 3 causes the armature 6 and the shaft 7 to move in accordance with the current value applied to the electromagnetic coil 8 on the electromagnetic drive solenoid 4 side. The thrust force in the direction A acting on the shaft 7 moves in the stroke range of the shaft 7 while keeping the balance of the spring force of the restoring spring 10 and moving together, so that the through hole 15 and the end surface k of the annular groove 13 are moved.
The opening area of the variable orifice 18 formed between

In the embodiment shown in FIG. 1, the casing 5 of the electromagnetically driven solenoid 4 is a fixed portion of the tip end surface of the control valve 3 in the switching valve 1.
Of the control valve 3 is formed as the locking portion 27, and the clearance dimension X between the locking portion 27 and the screw portion 5a is at least the electromagnetic drive solenoid. The armature 6 and the cover 9 on the fourth side are kept equal to or smaller than the clearance dimension D.

Thus, according to the embodiment, when the thrust reaction force applied from the control valve 3 side of the switching valve 1 causes the armature 6 and the shaft 7 on the electromagnetic drive solenoid 4 side to be pushed back together as a unit. ,
The base end surface of the armature 6 abuts at least the cover 9 which is a fixed portion of the electromagnetically driven solenoid 4 and is engaged therewith, or the engaging portion 27 which is the tip end surface of the control valve 3 before that is provided with the electromagnetically driven solenoid 4. Then, the screw portion 5a of the casing 5, which is the fixed portion of the above, comes into contact with and is locked by the tip end surface of the screw portion 5a.

As a result, the thrust reaction force applied from the control valve 3 side is supported by the contact surface between the control valve 3 and the casing 5 without acting on the joint between the armature 6 and the shaft 7, and therefore, The positional relationship between the armature 6 and the shaft 7 will not be displaced.

FIG. 2 shows another embodiment of the present invention. In the embodiment of FIG. 1, the front end surface of the control valve 3 is made to face the casing 5 on the electromagnetic drive solenoid 4 side. While the tip end surface of the control valve 3 is configured as the locking portion 27, in this embodiment, the collar-shaped locking portion 27a is integrally configured on the outer periphery of the base end portion of the control valve 3. The locking portion 27a is opposed to the valve housing 2, which is the fixed portion, with the gap dimension X maintained.

Therefore, even in this case, the base 9 of the armature 6 on the side of the electromagnetic drive solenoid 4 is at least a fixed portion, as in the previous embodiment shown in FIG.
When the control valve 3 is locked, the base end locking portion 27a of the control valve 3 hits and locks the valve housing 2 which is a fixed portion.

[0030]

As described above, according to the first aspect of the present invention, it is considered that the thrust reaction force applied from the control valve on the switching valve side pushes back the armature and the shaft on the electromagnetically driven solenoid side. Also, the base end surface of the armature at least hits the fixed part and is locked, or the locking part of the control valve hits the fixed part before that and is locked. Since the thrust reaction force is directly received at the abutting surface of the portion, the relative positional relationship between the armature on the electromagnetic drive solenoid side and the shaft is prevented from deviating.

Further, according to the invention of claim 2, there is an advantage that the above-mentioned effect can be achieved without constructing an engaging portion especially for the control valve.

Further, according to the invention of claim 3, there is an advantage that the same effect can be exhibited by simply making a simple change on the switching valve side without making any change to the structure on the electromagnetic drive solenoid side. Have.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of an electromagnetically driven solenoid valve embodying the present invention.

FIG. 2 is a vertical sectional front view of an electromagnetically driven solenoid portion showing another embodiment of the present invention.

FIG. 3 is a vertical sectional front view showing a conventional example of an electromagnetically driven solenoid valve.

FIG. 4 is a vertical sectional front view of an electromagnetically driven solenoid portion for explaining the problems of the conventional example.

[Explanation of symbols]

1 Switching valve 2 Valve housing (fixed part) 3 Control valve 4 Electromagnetic drive solenoid 5 Casing (fixed part) 5a Screw part (fixed part) 6 Armature 7 Shaft 8 Electromagnetic coil 9 Cover (fixed part) 10 Restoration spring 27 Locking part 27a Locking part D Gap between the base end face of the armature and the fixed part X Gap between the locking part and the fixed part of the control valve

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[Procedure amendment]

[Submission date] June 8, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

Thus, according to the present invention, when the armature and the shaft on the electromagnetically driven solenoid side are pushed back by the thrust reaction force applied from the control valve on the switching valve side, the base end surface of the armature contacts at least the fixed portion. The locking portion of the control valve comes into contact with the fixed portion and is locked before that.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

The shaft 7 is integrally connected to the armature 6 by means such as press fitting or caulking, and a guide 21 that is oil-tightly fitted to the base end of the casing 5 via a seal 20. The cover 9 is attached,
The armature 6 and the shaft 7 are slidably supported via bushes 22 and 23 provided on the casing 5 and the guide 21.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

As a result, the hydraulic oil flowing from the side of the switching valve 1 to the side of the electromagnetic drive solenoid 4 causes the bush 2 to move.
2 and 23 are lubricated, and the hydraulic oil is applied to the valve housing 2 on the switching valve 1 side and the electromagnetic drive solenoid 4
The seal 19 prevents leakage from the outside between the casings 5 on the side.
In addition, the seals 20, 25 and 26 prevent leakage to the electromagnetic coil 8 portion.

Claims (3)

[Claims] 1. A stroke of a control valve is controlled according to a change of a current value applied to the electromagnetic drive solenoid by applying a control valve to a shaft press-fitted or caulked with an armature of the electromagnetic drive solenoid by a restoring spring. In the electromagnetically driven solenoid valve, the base end face of the armature of the electromagnetically driven solenoid is abutted against at least the fixed portion on the electromagnetically driven solenoid side or is locked to the fixed portion before the control valve of the switching valve. An electromagnetically driven solenoid valve, which is provided with a locking portion that is locked by hitting. 2. A stroke of the control valve is controlled in response to a change in a current value applied to the electromagnetic drive solenoid by applying a control valve to a shaft press-fitted or caulked with an armature of the electromagnetic drive solenoid by a restoring spring. In the electromagnetically driven solenoid valve configured as described above, the tip end surface of the control valve in the switching valve is used as a locking portion to face the fixed portion,
An electromagnetically driven solenoid valve characterized in that the clearance between the locking portion and the fixed portion of the control valve is set to be at least equal to or smaller than the clearance between the base end surface of the armature and the fixed portion of the electromagnetically driven solenoid. . 3. The stroke of the control valve is controlled according to the change of the current value applied to the electromagnetically driven solenoid by applying the control valve to the shaft press-fitted or crimp-coupled to the armature of the electromagnetically driven solenoid by the restoring spring. In the electromagnetically driven solenoid valve thus configured, a locking portion facing the fixed portion is provided at the base end portion of the control valve in the switching valve,
An electromagnetically driven solenoid valve characterized in that the clearance between the locking portion and the fixed portion of the control valve is set to be at least equal to or smaller than the clearance between the base end surface of the armature and the fixed portion of the electromagnetically driven solenoid. .