JP2002260919A - Actuator solenoid with shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive means which is capable of preventing a problem such as seating failure of a valve body when a lateral force is applied to the plunger of an actuator such as a solenoid or the like. SOLUTION: This actuator solenoid is composed of a solenoid 41, a core 38 magnetized by the solenoid 41, a plunger 31 which is movable as it is guided by the cylindrical inner surface 40 of the core 38, a valve shaft 24 which is loosely inserted into the hole 32 of the plunger 31, can be slightly tilted, and engaged with the plunger 31 by a means of stopping the shaft 24 from moving relatively in an axial direction, and an object of driving such as the plunger 31. Even if the plunger 31 is tilted or leaned when a lateral force is applied, the valve shaft 24 or the valve body 25 are restrained from being tilted because the small diameter part 29 of the valve shaft 24 is loosely inserted into the center hole 32 of the plunger 31. The movement of the plunger 31 in the axial direction is transmitted through a stopper 33, a stepped part 30, and the like without hindrance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid type actuator with a shaft used for an electromagnetic valve or the like.

[0002]

2. Description of the Related Art Like a conventional solenoid valve 1 shown in FIG. 2, a displacement of a plunger 3 which is a driving body in a solenoid type actuator 2 is controlled by a driven body such as a valve body 5 via a shaft (or rod) 4. In the equipment for transmitting to the plunger 3, the shaft 4 is usually pressed or welded,
Alternatively, it is fixed by integrally joining with a method such as caulking. Similarly, the shaft 4 and the valve body 5 which is a driven body are fixed by being integrally joined by press-fitting or other methods. In FIG. 2, reference numeral 6 denotes a solenoid (coil) for magnetically driving the plunger 3, and reference numeral 7 denotes a valve seat having an opening cooperating with the valve body 5.

As described above, in the conventional general solenoid valve 1 illustrated in FIG.
The plunger 3 and the shaft 4 to which the valve element 5 is attached are integrally fixed, so that in addition to the driving force by the solenoid 6 acting on the plunger 3 in the axial direction of the shaft 4, this driving force and When, for example, a right-angle force (lateral force) or the like is applied, the shaft 4 tilts, and the valve body 5 attached thereto does not properly seat on the valve seat 7, so that the solenoid valve 1 is completely closed. The valve may not be available.

In order to solve this problem in the conventional solenoid valve 1, a conventional improved solenoid valve 8 shown in FIG. 3 is integrally joined to a plunger 9 by, for example, press fitting. In addition to the first shaft 10, a second shaft 11 is independently supported on an extension thereof, and valve bodies 14 and 15 are attached to the second shaft 11.
By biasing one of them towards the other by a spring or the like and abutting them at point 12 so that if one of them tilts with respect to the other, its effect will not reach the other. I have.

[0005]

[0007] As the electromagnetic valve 8, which is a conventional advanced 3, using two shafts 10 and 11 to abut at point 12, lateral force acting on the plunger 9 However, only the plunger 9 and the first shaft 10 incline, the second shaft 11 does not incline, and only the axial displacement of the plunger 9 is changed from the first shaft 10 to the second shaft 11. Therefore, the problem in the solenoid valve 1 shown in FIG. However, the improved conventional solenoid valve 8 not only increases the number of shafts and bearings but also biases the shafts to support the two shafts 10 and 11 against each other. Another problem is that a spring or the like to make abutment is required, and the structure becomes complicated, thereby increasing the cost.

The present invention addresses the above-described problem in the conventional solenoid valve 1 shown in FIG. 2, and a driven member such as a shaft or a valve body is inclined even when a lateral force acts on the plunger. In addition, the structure does not cause problems such as poor seating on the valve seat, and the structure becomes complicated and the cost increases as in the improved conventional solenoid valve 8 shown in FIG. It is an object of the present invention to provide a further improved solenoid type actuator with a shaft.

[0007]

SUMMARY OF THE INVENTION The present invention provides a solenoid actuator with a shaft as described in claim 1 as a solution to the aforementioned problems in the prior art.

In the solenoid type actuator with a shaft according to the present invention, a part of the shaft attached to the driven body is loosely inserted into the hole of the plunger so as to be slightly inclined, and the shaft is attached to the plunger. Engaged by means for preventing relative axial movement, the driven body is not tilted when the plunger is tilted or biased by any lateral force, as the shaft does not tilt with it. Is prevented from deviating from the normal position.

The present invention can be suitably applied to, for example, an electromagnetic valve, an electromagnetic switch, or an actuator of an electromagnetic clutch.

In the solenoid type actuator with a shaft according to the present invention, specifically, a means for preventing relative movement in the axial direction between the plunger and the shaft is provided by a step formed on the shaft and a tip of the shaft. it can be constituted by the which stopper provided. This stopper can be generally carried out by forming a large part to the distal end of the shaft, More specifically, the ampulla to be the stopper, and an annular groove formed on the shaft, fitted to it With the snap ring, the actuator can be securely retained with a simple structure.On the other hand, if necessary, the snap ring can be removed and the actuator can be easily disassembled. It is convenient.

[0011]

DETAILED DESCRIPTION OF THE INVENTION with reference to FIG. 1, will be described solenoid valve 15 is a preferred embodiment of a shaft with a solenoid-type actuator of the present invention. The electromagnetic valve 15 specifically belongs to an air switching valve (ASV) for intermittently controlling the flow of air. Valve body 16
Has an inlet 17 and an outlet 18 formed therein. However, the inlet 17 and the outlet 18 may be alternated. The inlet 17 is connected to an air cleaner or the like of an internal combustion engine (not shown) by a pipe to introduce clean air into the main body 16. Exit 18
Are connected to the exhaust manifold of the same internal combustion engine so that the air that has passed through the solenoid valve 15 is mixed into the exhaust gas as secondary air. In the case of the illustrated embodiment, the outlet 1
8 is provided with a check valve comprising a reed valve 19 and a stopper 20, whereby exhaust gas is prevented from being blown back, and an upstream portion such as the solenoid valve 15 is protected.

A partition wall 2 for partitioning between an inlet 17 and an outlet 18
1, a valve seat 23 having an opening 22 is formed. A disc-shaped valve element 25 is integrally joined to the lower end of the valve shaft 24 substantially coincident with the center of the valve seat opening 22 by a method such as caulking or welding. In addition, an annular seal member 26 made of rubber is attached to a peripheral portion of the valve body 25 that comes into contact with the surface of the valve seat 23 in order to improve sealing performance when the valve is closed.
An intermediate portion of the valve shaft 24 is supported by a bush (bearing) 27 so as to be slidable in the axial direction. Reference numeral 28 denotes a sealing device for preventing dust or the like from entering the bush 27 and causing a problem. The flange portion of the bush 27 functions as a spring holder and also as a stopper for controlling the stroke between the valve shaft 24 and the valve body 25.

[0013] valve upper side of the portion of the shaft 24 have a small diameter portion 29 having a diameter a little bit decreased, stepped portion 30 between the large diameter portion of the intermediate is formed. The small diameter portion 29 of the valve shaft 24 is loosely inserted into the center hole 32 of a cylindrical plunger 31 made of a magnetic material such as iron. The plunger 31 may be a permanent magnet made of a ferromagnetic material. Although the inner diameter of the center hole 32 of the plunger 31 is slightly larger than the outer diameter of the small diameter portion 29 of the valve shaft 24, this does not necessarily create a large gap. It can be slightly inclined without being fitted (fixed) to the shaft 24.

After the small-diameter portion 29 of the valve shaft 24 is loosely inserted into the center hole 32 of the plunger 31, the tip of the small-diameter portion 29 is provided with a stopper 33. The stopper 33 in the illustrated embodiment is completed by mounting a snap ring 35 in an annular groove 34 formed at the tip of the small diameter portion 29 in the radial direction. Not only this, but also as the stopper 33, for example, a male screw is formed at the tip of the small diameter portion 29 of the valve shaft 24, and the nut is screwed onto the male screw. Or small diameter part 2
9 by applying caulking, vertical splitting, welding, or the like to the tip of the small diameter portion 29 of the valve shaft 24 to form an enlarged portion sufficiently larger than the inner diameter of the center hole 32 of the plunger 31. Methods can be used.
At that time, a washer may be fitted to a portion where the enlarged portion contacts the upper surface of the plunger 31.

A flange 36 formed on the bush 27
A compression spring 37 is provided between
Is mounted in advance. The flange 36 of the bush 27 is supported by a step 39 formed at the lower end of a generally cylindrical core 38 made of a magnetic material such as iron. The cylindrical inner surface 40 of the core 38 has an inner diameter slightly larger than the outer diameter of the plunger 31, thereby guiding the plunger 31 movably in the axial direction of the valve shaft 24 without frictional resistance. Solenoid 4 around core 38
1 is wound and fixed on a bobbin 42 made of plastic.

A disk portion 43 integrally enlarged in the radial direction from the lower end of the core 38 is supported by a step portion 44 of the valve body 16. The housing 45 of the actuator integrally mounted at right angles to the body 16 of the valve is substantially cylindrical,
A cylindrical yoke 46 having a bottom and made of a magnetic material such as iron is provided around a solenoid 41 inside the disk 41 so as to be an extension of the core 38. Are in contact with each other. In addition, the conducting wire 47 taken out from the solenoid 41 is connected to the terminal 50 in the connector 48 through the opening 49 of the yoke 46. Core 3
An annular notch 51 is formed outside the central portion of 8. The height position of the notch 51 is such that when the plunger 31 is magnetically attracted by the solenoid 41 and descends from the position shown in FIG. 1, it overlaps the entire thin bottom of the notch 51.

As is apparent from the cross-sectional shape shown in FIG. 1, when a current flows through the solenoid 41 and is magnetized, the core 38 and the yoke 46 form a donut-shaped closed magnetic circuit. Since this magnetic circuit is confined at the notch 51 of the core 38, the magnetic flux concentrates at that portion and the magnetic flux density increases. Therefore, the plunger 31 is magnetically attracted and moved toward the constricted portion so as to compensate for the small thickness of the constricted portion, so that the plunger 31 descends against the urging force of the spring 37. . At that time, the plunger 31 pushes down the valve shaft 24 by the step portion 30, so that the valve body 25 integrated with the valve shaft 24 is formed.
Opens the opening 22 of the valve seat 23, the electromagnetic valve 15 is opened, and the air at the inlet 17 flows to the outlet 18.

In the illustrated embodiment, the valve seat opening 2
Since a reed valve 19 is further provided on the downstream side of 2,
The air flowing to the outlet 18 in the open state of the solenoid valve 15 pushes the reed valve 19 open by its pressure, flows into the exhaust gas flowing inside the exhaust manifold 52, and mixes with it.

In accordance with the feature of the present invention, in the solenoid valve 15 of the illustrated embodiment, the plunger 31 is not fixedly attached to the valve shaft 24 as described above, and the small diameter portion 29 of the valve shaft 24 Since a small difference is provided between the outer diameter and the inner diameter of the center hole 32 of the plunger 31, the small-diameter portion 29 is spaced apart from the center hole 3 of the plunger 31 by a predetermined size.
It is only loosely inserted in 2. However, the plunger 31
The downward movement is caused by the engagement of the lower surface of the plunger 31 with the step portion 30 of the valve shaft 24, and the upward movement is achieved by the stopper 33 formed on the upper surface of the plunger 31 and the upper end of the valve shaft 24. Is performed with the valve shaft 24 without any trouble.

In a normal solenoid valve, the plunger, the valve shaft, and the valve body are integrated, so that the plunger receives some lateral force in the core, so that the plunger is slightly moved within the gap between the core and the guide hole. Leaning or biasing toward
As a result of the inclination of the valve shaft and the valve body, the valve body does not properly seat on the surface of the valve seat in the valve closed state, so that a complete valve closed state cannot be obtained.

On the other hand, in the solenoid valve 15 of the illustrated embodiment, the plunger 31 is inclined or deviated within the range of the gap between the plunger 31 and the inner surface 40 of the core 38 due to such a lateral force. However, the valve shaft 24 against the plunger 31
Is not fixed, the inclination and deviation of the plunger 31 are not transmitted to the valve shaft 24, and the valve shaft 24 can maintain the original axial position. Therefore, the solenoid valve 1
In the closed state of No. 5, the valve body 25 is normally seated on the valve seat 23 by the urging force of the spring 37, and there is no occurrence of air leakage or backflow of exhaust gas.

In the illustrated embodiment, a solenoid type actuator for operating a valve body of a solenoid valve is specifically described as an example. However, the present invention is not limited to the solenoid valve, and may be used for driving switches and clutches. It can be widely applied to general solenoid type actuators. Further, when the present invention is applied to a solenoid valve, the solenoid valve is not limited to the solenoid valve 15 which merely opens and closes the valve seat opening 22 as in the illustrated embodiment, but is generated in accordance with the amount of current supplied to the solenoid 41. In a balanced relationship between the electromagnetic force generated and the urging force generated by the spring 37, the control valve may be configured to continuously change the valve opening.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a conventional example.

FIG. 3 is a longitudinal sectional view showing an improved conventional example.

[Explanation of symbols]

 1 ... as an embodiment of a conventional solenoid valve 2 ... conventional solenoid type actuator 3 ... plunger 4 ... shaft 8 ... conventional improved solenoid actuator 9 ... plungers 10, 11 ... shaft 12 ... abutment point 15 ... present invention Solenoid valve 24 ... Valve shaft 25 ... Valve element 27 ... Bush 29 ... Small diameter portion of valve shaft 30 ... Step portion 31 ... Plunger 32 ... Center hole of plunger 33 ... Retainer 34 ... Annular groove 35 ... Snap ring 37 ... Compression spring Reference numeral 38: core 40: core cylindrical inner surface 41: solenoid 45: actuator housing 46: yoke

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinichi Nitta 1-1-1 Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (reference) 3H106 DA07 DA13 DA23 DB02 DB12 DB22 DB32 DC02 DC17 DD09 EE39 EE48 GA15 GB06 KK01 5E048 AB01 AD02

Claims (5)

[Claims] 1. A solenoid having at least a cylindrical portion and having a core magnetized when the solenoid is energized, and movable inside the cylindrical portion of the core in an axial direction of the cylindrical portion. A plunger and a shaft, at least a portion of which is loosely inserted into the bore of the plunger and may be slightly inclined, and which is engaged therewith by means for inhibiting axial relative movement with respect to the plunger; And a driven body attached to the shaft and capable of moving together with the shaft. 2. The solenoid type actuator with a shaft according to claim 1, wherein the driven body is a valve body for opening and closing a valve seat opening, and the whole is configured as an actuator for a solenoid valve. . 3. The solenoid type actuator with a shaft according to claim 1, wherein the solenoid type actuator is applied to a switch or a clutch. 4. The method of claim 1, means for preventing relative axial movement between said plunger and said shaft, and a stepped portion formed on the shaft, provided at a tip of the shaft A solenoid type actuator with a shaft, characterized in that it is provided with a stopper. 5. The solenoid type actuator with a shaft according to claim 4, wherein the stopper comprises an annular groove formed in the shaft and a snap ring engaged with the annular groove.