JP3079247B2 - Normally open solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a valve housing comprising a housing main body integrally having a fixed core and a guide cylinder arranged on one end side of the fixed core and connected to the housing main body. A movable core having one end opposed to the guide cylinder is slidably fitted to the guide cylinder, has a valve body at one end that can be seated on a valve seat provided on the housing main body, and has the other end abutting on the movable core. The present invention relates to a normally-open solenoid valve in which a valve shaft made of a material is slidably fitted to a housing main body and a fixed core, and the valve shaft is elastically urged toward the movable core.

[0002]

2. Description of the Related Art Conventionally, such a normally-open solenoid valve has been already known, for example, from Japanese Utility Model Laid-Open No. 6-4479.

[0003]

However, in the above-mentioned prior art, the small-diameter shaft portion that can be seated on the valve seat and the large-diameter shaft portion that abuts on the movable core are coaxially and integrally connected. The fixed core is provided with a relatively large diameter sliding hole for slidably fitting the large diameter shaft portion of the valve shaft. On the other hand, in order to relatively increase the electromagnetic force for attracting the movable core to the fixed core during excitation, it is necessary to increase the area of the mutually facing surfaces of the fixed core and the movable core. In a structure in which a relatively large diameter sliding hole is provided in the fixed core as in the above, in order to increase the adsorption area of the fixed core with respect to the movable core and obtain sufficient electromagnetic efficiency, the fixed core and the movable core are required. The cross-sectional area must be set relatively large, and the size of the normally-open solenoid valve must be increased.

The present invention has been made in view of the above circumstances, and provides a normally-open solenoid valve capable of improving the electromagnetic efficiency by sufficiently increasing the adsorption area of a fixed core to a movable core. With the goal.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a housing body having a fixed core integrally therewith, and a guide cylinder which is arranged at one end side of the fixed core and is connected to the housing body. And a movable core having one end opposed to the fixed core is slidably fitted to the guide cylinder, and has a valve body at one end capable of closing a valve hole provided in the housing main body. A normally open solenoid valve in which a valve shaft made of a nonmagnetic material whose end abuts on the movable core is slidably fitted to the housing main body and the fixed core, and the valve shaft is elastically biased toward the movable core. in, the valve shaft, and abutting the shaft portion abutting against the fixed core, and the sliding shaft portion which is coaxially connected to its contact shank, the relevant Sejjiku portion than sliding shaft portion
Is formed as a small diameter, the housings principal and the fixed core, and the sliding support hole portion for slidably fitting the sliding shaft,
The fixed core is formed smaller in diameter than the sliding support hole so that the fixed core can move.
A sliding hole is provided, which is coaxially connected to the sliding support hole so as to open to the end face on the core side and has an insertion hole for loosening the contact shaft.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

In FIG. 1, a valve housing 1 of the normally-open solenoid valve is formed by a housing main body 2 integrally formed with a stepped cylindrical member made of magnetic metal and integrally formed with a cylindrical fixed core 10. The base end of a guide cylinder 3 formed of a non-magnetic material, for example, stainless steel and having a thin bottomed cylindrical shape with a hemispherical closed end at the tip end, is connected by welding or the like, for example. Cylinder 3
Is fixedly disposed within the base end of the.

The housing main body 2 is fitted and fixed to a metal base 4, and the base 4 has one surface 4a.
A stepped fitting hole 5 is formed so as to be able to fit the housing main body 2, and an inner surface near the opening end of the fitting hole 5 is engaged with the housing main body 2 to engage with the housing main body 2. A retaining ring 6 for preventing detachment from the fitting is fitted. In addition, the guide cylinder 3 projects from one surface 4a of the base 4 in a state where the housing main body 2 is fitted into the fitting hole 5 and fixed. Two annular sealing members 7 and 8 are mounted on the outer surface of the housing main body 2 at intervals in the axial direction, and between the sealing members 7 and 8, a ring is formed between the base 4 and the housing main body 2. A chamber 9 is formed.

A movable core 11 facing the fixed core 10 is slidably fitted in the guide cylinder 3. A cylindrical valve seat member 1 having a valve hole 13 is provided at an intermediate portion of the housing 2.
2 is press-fitted and fixed, and one end of the housing main body 2 and the fixed core 10 is regulated by the valve seat member 12 between the valve seat member 12 and a surface of the fixed core 10 facing the movable core 11. And a sliding hole 14 is provided. A valve shaft 15 made of a non-magnetic material and having a spherical valve body 16 at one end capable of sitting on the valve seat member 12 and closing the valve hole 13 is slidably fitted in the sliding hole 14. The other end of the valve shaft 15 is coaxially abutted on the movable core 11. A return spring 18 is housed in a valve chamber 17 formed between the valve shaft 15 and the valve seat member 12. The spring force of the return spring 18 causes the valve shaft 15 to resilient in a direction in which it comes into contact with the movable core 11. Thus, the valve body 16 is urged in a direction away from the valve seat member 12.

The valve shaft 15 has a small-diameter valve body support shaft portion 15a to which the valve body 16 is fixed, a sliding shaft portion 15b having a larger diameter than the valve body support shaft portion 15a, and a sliding shaft portion 15b. A small diameter contact shaft portion 15c is coaxially and integrally connected in this order, and the return spring 1 is formed in a coil shape.
8 is contracted between the valve shaft 15 and the valve seat member 12 so as to surround the valve body support shaft portion 15a.

The sliding hole 14 comprises a sliding support hole 14a provided with a valve seat member 12 at one end, and an insertion hole 14b coaxially connected to the sliding support hole 14a. It is. The inner diameter of the sliding support hole 14a is set so that the sliding shaft 15b of the valve shaft 15 is slidably fitted. The insertion hole 14b is formed to have a smaller diameter than the sliding support hole 14a, and is opened at the end face of the fixed core 10 on the movable core 11 side. The inner diameter of the insertion hole 14b is equal to the contact shaft portion 15c of the valve shaft 15. Is set to such an extent that Further, on the outer surface of the sliding shaft portion 15b of the valve shaft 15, the sliding shaft portion 1b is provided.
One or a plurality of flow grooves 19 that allow the flow of the working fluid across both ends of 5b are provided along the axial direction.

The housing main body 2 is provided with a brake pressure passage 2 provided on a base 4 in connection with a master cylinder (not shown).
1 and the valve seat member 12 so that the flow passage 20
Is provided at the outer end of the flow passage 20.
2 is attached. A filter 23 is mounted on the outer periphery of the housing main body 2 at a portion facing the annular chamber 9, and a passage 24 for allowing the valve chamber 17 to communicate with the annular chamber 9 via the filter 23 is provided in the housing main body 2. . Further, the valve is opened between the valve seat member 12 and the filter 22 of the housing main body 2 when the pressure of the flow passage 20 becomes lower than that of the annular chamber 9 to return the hydraulic fluid in the annular chamber 9 to the brake pressure passage 21 side. A check valve 25 is provided. Further, a brake pressure passage 26 connected to a wheel brake (not shown) is formed in the base 4 so as to be continuous with the annular chamber 9.

The guide cylinder 3 includes a bobbin 28 and the bobbin 2
The coil 29 wound around 8 is inserted into a coil unit 31 embedded in a mold part 30 made of a synthetic resin, and the coil unit 31 is fastened to the base 4 by a coupling structure (not shown). Is done. The coil unit 31 is surrounded by a magnetic path tube 32, and a contact portion 33 provided at one end of the magnetic path tube 32 is formed by a housing 34 by a spring 34 provided between the contact portion 33 and the coil unit 31. It is brought into contact with the subject 2. Further, a magnetic path plate 35 is connected to the other end of the magnetic path tube 32, and the distal end portion of the guide tube 3 is fitted into a fitting hole 36 provided in the magnetic path plate 35.

Next, the operation of this embodiment will be described. The valve element 16 has one end and the other end has the movable core 1.
The valve shaft 15 made of a non-magnetic material to be brought into contact with the fixed core 1
0, and a sliding shaft portion 15b formed to have a larger diameter than the contact shaft portion 15c, and a sliding hole 14 formed in the housing main body 2 and the fixed core 10.
A sliding support hole portion 14a for slidably fitting the sliding shaft portion 15b, and an insertion hole formed with a smaller diameter than the sliding support hole portion 14a and allowing the contact shaft portion 15c to be loosely inserted. Since the portion 14b is coaxially connected to the movable core 11, the opening area of the sliding hole 14 on the surface of the fixed core 10 facing the movable core 11 is made relatively small, and the movable core 1 of the fixed core 10
It is possible to make the adsorption area for 1 relatively large. Thus, the cross-sectional area of the fixed core 10 and the movable core 11 is set relatively small to reduce the size of the normally-open solenoid valve, and it is possible to obtain sufficient electromagnetic efficiency.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

[0016]

According to the present invention as described above, according to the present invention, the valve shaft, and abutting the shaft portion abutting against the fixed core, and the sliding shaft portion which is coaxially connected to its contact shank, The corresponding contact than the sliding shaft
Is formed a shaft portion as a small-diameter, the housings principal and the fixed core, and the sliding support hole portion for slidably fitting the sliding shaft portion, a diameter smaller than the sliding supporting hole portion fixed core
And a through hole provided coaxially with the slide support hole so as to open to the end face of the movable core side and having an insertion hole for loosening the contact shaft. By making the opening area of the sliding hole on the surface facing the movable core relatively small, the adsorption area of the fixed core to the movable core is made relatively large, and the cross-sectional area of the fixed core and the movable core is made relatively small. As a result, sufficient electromagnetic efficiency can be obtained while reducing the size of the normally-open solenoid valve.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a normally-open solenoid valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Valve housing 2 ... Housing main body 3 ... Guide cylinder 10 ... Fixed core 11 ... Movable core 13 ... Valve hole 14 ... Sliding hole 14a ... Sliding support Hole 14b: insertion hole 15: valve shaft 15b: sliding shaft 15c: contact shaft 16: valve body

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-11397 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 31/06

Claims (1)

(57) [Claims] 1. A housing main body (2) integrally having a fixed core (10), and a guide cylinder (3) provided with the fixed core (10) at one end side and connected to the housing main body (2). A movable core (11), one end of which is opposed to the fixed core (10), is slidably fitted to the guide cylinder (3) and is provided on the housing main body (2). The valve body (1) capable of closing the valve hole (13)
A valve shaft (15) made of a non-magnetic material having one end (6) and the other end in contact with the movable core (11) is slidably fitted to the housing main body (2) and the fixed core (10). In the normally-open type solenoid valve in which the valve shaft (15) is resiliently biased toward the movable core (11), the valve shaft (15) has a contact shaft portion (15c) contacting the fixed core (10). ) and sliding shaft which is coaxially connected to the to those Sejjiku portion (15c) and (15b), but sliding shaft portion (15b)
Also formed corresponding Sejjiku portion (15c) as a smaller diameter than, housings in the main (2) and the fixed core (10), the sliding support hole portion for fitting sliding shaft portion (15b) slidably (14a) and an end of the fixed core (10) on the movable core (11) side, which is formed to have a smaller diameter than the sliding support hole (14a).
A sliding hole (14) coaxially connected to the sliding support hole (14a) so as to open to the surface and having an insertion hole (14b) for loosening the contact shaft (15c). A normally-open solenoid valve, which is provided.