JPH10311454A - Linear solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the leaking of a fluid in a valve main body from the pressing-in part of a pressure relief cap and a pressure relief cap installing hole, after the set load of a valve body spring is regulated by the pressure relief cap by pressing-in the pressure relief cap to the pressure relief cap installing hole. SOLUTION: In a pressure relief cap 11, a thin wall tubular pressing-in tube 11B and an elastic ring support tube 11C are connected The pressure relief cap 11 is advanced and provided in a pressure relief cap installing hole 10 of a valve body 8, and the pressing-in tube 11B is wedged toward the inner peripheral wall 10B of the pressure relief cap installing hole 10, as well as pressed in to the pressure relief cap installing hole 10. The elastic ring support tube 11C is inserted to the pressure relief cap installing hole 10, an elastic ring member 13 is contracted and provided between them, and the leaking of a liquid in the valve main body from the pressure relief cap installing hole 10 to the outer side is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spool valve in which a solenoid portion is disposed at one end of a valve body and is urged in the other direction by electromagnetic thrust generated in the solenoid portion in a valve body support hole of the valve body. The present invention relates to a linear solenoid valve in which a valve spring for pressing a spool valve in one direction is contracted between a pressure regulating cap fixed to a valve body and a spool valve.

[0002]

2. Description of the Related Art As a conventional linear solenoid valve, there is JP-A-8-303627 filed by the present applicant. In this method, a pressure regulating cap formed in a thin cylindrical shape with a bottom is press-fitted into a pressure regulating cap mounting hole of a valve body, and the pressure regulating cap is caulked so that a part thereof bites into an inner peripheral wall of the mounting hole. Things.

[0003]

According to such a conventional linear solenoid valve, there is a possibility that the liquid in the valve body leaks to the outside from the press-fitting portion between the pressure adjusting cap and the pressure adjusting cap mounting hole of the valve body. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problem, and the liquid in the valve body is externally supplied from a press-fit portion between the pressure adjusting cap and the pressure adjusting cap mounting hole after adjusting the set load of the valve body spring. An object of the present invention is to provide a linear solenoid valve that does not leak.

[0005]

In order to achieve the above object, a linear solenoid valve according to the present invention has a solenoid portion disposed at one end of a valve body, and the solenoid portion is formed in a valve body support hole of the valve body. A spool valve body urged in the other direction by the electromagnetic thrust is movably disposed, a pressure regulating cap is fixedly disposed in a pressure regulating cap mounting hole opened at the other end of the valve body, and the pressure regulating cap and the spool valve are disposed. In a linear solenoid valve in which a valve body spring that presses a spool valve body in one direction is compressed between the body and the body, the pressure regulating cap supports a thin-walled press-fitting cylinder portion and an elastic ring member on its outer periphery. The press-fitting cylinder is press-fitted into the pressure adjustment cap mounting hole and the press-fitting cylinder is wedge-fitted toward the inner peripheral wall of the pressure adjustment cap mounting hole. The support cylinder is Is inserted in the pressure cap mounting hole, the inner peripheral wall of the pressure regulating cap mounting hole, a first feature in that an elastic ring member disposed under compression between the elastic ring supporting cylinder unit.

According to the present invention, in addition to the first feature, the pressure regulating cap is formed in a thin cylindrical shape with a bottom, and the outer diameter of the elastic ring supporting cylindrical portion is smaller than the outer diameter of the press-fitting cylindrical portion. This is a second feature.

Further, according to the present invention, in addition to the first feature, the press-fitting cylindrical portion of the pressure adjusting cap is formed in a thin cylindrical shape, and the elastic ring supporting cylindrical portion is formed in a solid shape. A third feature is that an annular groove for accommodating the elastic ring member is formed in the outer periphery of the cylindrical portion, and the outer diameter of the elastic ring supporting cylindrical portion is smaller than the outer diameter of the press-fitting cylindrical portion.

[0008]

According to the first feature of the present invention, the set load of the valve body spring can be adjusted by adjusting the depth of press-fitting of the pressure-adjustment cap into the pressure-adjustment cap mounting hole, and the press-fitting cylinder can be attached to the press-fit cylinder. By wedge-fitting the inner peripheral wall of the hole, the bonding strength between the pressure adjusting cap and the pressure adjusting cap mounting hole can be further increased. In addition, since the elastic ring member is particularly provided between the inner peripheral wall of the pressure adjusting cap mounting hole and the elastic ring support cylindrical portion, the liquid in the valve body leaks outside from the opening of the pressure adjusting cap mounting hole. Can be completely suppressed.

According to a second feature of the present invention, the press-fitting cylindrical portion and the elastic ring supporting cylindrical portion are integrally formed to have a bottomed thin shape. Since the outer diameter of the elastic ring member is smaller than the outer diameter of the elastic ring member, a space for accommodating the elastic ring member can be formed in accordance with the difference in diameter between the press-fitting cylindrical portion and the supporting cylindrical portion, thereby facilitating the storage arrangement of the elastic ring member.

Further, according to a third feature of the present invention, the elastic ring support cylinder is formed in a solid shape, and the elastic ring is disposed in the annular groove formed in the outer periphery thereof. The elastic ring support cylinder does not shrink inward even when the elastic ring member is pressed inward by being inserted into the pressure adjustment cap mounting hole, and the elastic ring member seals. In this way, it is possible to maintain the satisfactorily and to more reliably suppress the leakage of the liquid from inside the valve body.

[0011]

FIG. 1 shows an embodiment of a linear solenoid valve according to the present invention. Linear solenoid valve 1
Is composed of a solenoid portion S and a valve portion V. The solenoid portion S is disposed so as to close the open end of the housing 2 and the coil 3 disposed in the housing 2 and the coil 2 disposed in the housing 2. The movable core 5 includes a fixed core 4, a movable core 5 movably opposed to the fixed core 4, and an output rod 6 integrally fixed to the center of the movable core 5. When a current flows through the coil 3, an electromagnetic thrust proportional to the current value is generated in the movable core 5, and the output rod 6
Is moved to the left in the figure.

The valve portion V has a valve body support hole 7 formed coaxially with the output rod 6, and first to sixth ports 81 to 86.
And a spool valve element 9 slidably disposed in the valve element support hole 7. The extension of the valve body support hole 7 opens toward one end 8A and the other end 8B of the valve body 8, and the solenoid portion S is fixed on one end 8A of the valve body 8 so that the spool is fixed. One end 9A of the valve body 9 and the other end 6B of the output rod 6 are in contact with each other. Valve body 8
The valve body support hole 7 which is opened at the other end 8A of the valve is opened with a pressure adjusting cap mounting hole 10. A pressure adjusting cap 11 described later is press-fitted into the pressure adjusting cap mounting hole 10 and fixed to the valve body 8.
A valve body spring 12 is contracted between one end 11A of the spool valve body 9 and the other end 9B of the spool valve body 9. Thus, the spool valve element 9 is elastically urged in one direction B so as to contact the output rod 6. The first port 8 formed in the valve body 8
The structures of the first to sixth ports 86 and the spool valve element 9 are not limited to the embodiment shown in the figure, but may be appropriately selected according to the switching of the flow path.

When the solenoid portion S is not energized, the spool valve 9 is pressed in one direction B by the spring force of the valve spring 12, and is at the rightmost position in FIG. On the other hand, when the solenoid portion S is energized, an electromagnetic thrust proportional to the current value is generated in the movable core 5, whereby the output rod 6 is pressed in the other direction A, and the spool valve body 9 moves leftward in FIG. Moving. When the spool valve body 9 moves to the left, the spring force of the valve body spring 12 and the pressure in the sixth port 86 act synergistically on the other end 9B of the spool valve body 9 to cause the spool valve body 9 to move. 9 to FIG.
Acts as a reaction force to the right. As a result, the spool valve element 9 moves left and right so as to balance the electromagnetic thrust of the movable core 5 and the above-mentioned reaction force, whereby the first ports 81 to 81 are moved.
The opening of the sixth port 86 is controlled.

Here, the linear solenoid valve 1 according to the present invention has the following features. Referring to FIG.
The pressure regulating cap 11 is formed in a thin shape with a bottom, and has a cylindrical press-fitting cylinder portion 11B formed on the opening side.
A cylindrical elastic ring support tube portion 11C is formed on the bottom side of one end 11A on which is mounted. The outer diameter E of the elastic ring support cylinder 11C is smaller than the outer diameter F of the press-fit cylinder 11B. According to the above, the press-fitting cylinder portion 11B
Between the elastic ring support cylinder 11C and the elastic ring support cylinder 11C.
D is formed.

On the other hand, the pressure adjusting cap mounting hole 10 has a diameter smaller than the outer diameter F of the press-fitting cylindrical portion 11B so that the press-fitting cylindrical portion 11B of the pressure adjusting cap 11 is press-fitted and fixed. Open to end 8B. The pressure adjusting cap mounting hole 10 has a larger diameter than the outer diameter E of the elastic ring support cylindrical portion 11C. Also, the sixth port 8 of the pressure adjusting cap mounting hole 10
The diameter of the opening 10A into the pressure adjusting cap mounting hole 1 is
It is preferable that the diameter is smaller than the diameter of 0 and slightly larger than the diameter E of the elastic ring support cylinder 11C.

The assembly of the valve portion V is performed as follows. The spool valve element 9 is inserted into the valve element support hole 7 from the other end 8B of the valve body 8 through the pressure adjusting cap mounting hole 10, and then the valve element spring 12 is disposed on the other end 9B of the spool valve element 9. Then, the pressure adjustment cap 11 is pressed into the pressure adjustment cap mounting hole 10. An elastic ring member 13 such as an O-ring or a square ring made of an elastic material such as a rubber material is disposed on the outer peripheral surface of the elastic ring support cylindrical portion 11C of the pressure adjusting cap 11.

The pressure adjusting cap 11 is press-fitted into the pressure adjusting cap mounting hole 10 and fixed as follows. When the pressure adjustment cap 11 is caused to enter the pressure adjustment cap mounting hole 10, the elastic ring support cylindrical portion 11 </ b> C is first inserted into the pressure adjustment cap mounting hole 10 without being pressed. this is,
This is because the outer diameter E of the elastic ring support cylindrical portion 11C is smaller than the pressure adjusting cap mounting hole 10. On the other hand, the press-fit cylinder 11
B is press-fitted into the pressure adjustment cap mounting hole 10 with an appropriate press-fit load. This is because the outer diameter F of the press-fit cylindrical portion 11B is larger than the diameter of the pressure adjusting cap mounting hole 10. And
The set load of the valve body spring 12 is adjusted by adjusting the press-fit depth of the pressure adjustment cap 11. The adjustment of the press-fitting depth of the pressure-adjusting cap 11 is performed such that when a specified current flows through the solenoid portion S, the press-fitting is gradually performed so that the spool valve element 9 is at a predetermined position (in other words, a predetermined port opening control). Proceed to adjust the pressure adjusting cap 11 in a predetermined state.
Stop press fitting. Next, after the pressure adjustment cap 11 is adjusted and press-fitted, the press-fitting cylindrical portion 11B is expanded from the inside toward the inner peripheral wall 10B of the pressure adjustment cap mounting hole 10 and wedge-fitted. Thus, the pressure adjusting cap 11 is press-fitted into the pressure adjusting cap mounting hole 10 by the press-fitting cylinder portion 11B,
B can be securely fixed to the valve main body 8 by wedge attachment due to lateral expansion of the pressure adjusting cap mounting hole 10 on the inner peripheral wall 10B.

According to the above, the pressure regulating cap 11 is securely fixed to the pressure regulating cap mounting hole 10, and furthermore, the annular space formed by the elastic ring support cylindrical portion 11C and the pressure regulating cap mounting hole 10 has The elastic ring member 13 can be arranged in a compressed state. Therefore, the liquid that tends to leak from the valve body 8 to the outside through the pressure adjusting cap mounting hole 10 is blocked by the elastic ring member 13, so that the liquid is completely prevented from leaking out of the valve body 8. it can. In addition, the elastic ring member 13 is arranged on the outer periphery of the elastic ring support cylindrical portion 11C, and is inserted into the pressure adjusting cap mounting hole 10 by contracting and deforming.
1 attempts to escape from the pressure adjusting cap mounting hole 10 by the restoring force of the elastic ring member 13, but as described above, the pressure adjusting cap 11 fluctuates when the pressure adjusting cap 11 is wedged. Therefore, the pressure adjustment cap 11 can be accurately maintained at the adjusted position.

FIG. 3 shows another embodiment. This is different from the previous embodiment in the pressure adjusting cap and the pressure adjusting cap mounting hole. The pressure adjusting cap 20 is formed by a press-fitting cylindrical portion 20A and an elastic ring supporting cylindrical portion 20B. Press-fit cylinder 20
A is formed in a thin cylindrical shape and opens in the other direction A. The elastic ring support cylinder 20B is formed in the direction B from the press-fit cylinder 20A and has a solid shape. The outer diameter E of the elastic ring support cylinder 20B is equal to the outer diameter F of the press-fit cylinder 20A.
It has a smaller diameter, and further has an elastic ring support cylindrical portion 2.
An annular groove 20C for accommodating the elastic ring member 13 is formed in the outer periphery of 0B. On the other hand, the pressure adjustment cap mounting hole 21
Is composed of a first hole 21a directed toward the other end 8B of the valve body 8 and a second hole 21b directed from the first hole 21a toward the valve element supporting hole 7. The first hole 21a has a smaller diameter than the outer diameter F of the press-fitting cylinder 20A so that the press-fitting cylinder 20A of the pressure adjusting cap 20 is press-fitted.
It has a slightly smaller diameter so that 0B can be inserted.

The pressure regulating cap 20 in this embodiment is also inserted into the pressure regulating cap mounting hole 21 in the same manner as in the previous embodiment. That is, the elastic ring support cylindrical portion 20B of the pressure adjusting cap 20 is inserted into the second hole 21b of the pressure adjusting cap mounting hole 21, and the press-fitting cylindrical portion 20A is press-fitted into the first hole 21a. Then, in the state where the press-fitting depth of the pressure-regulating cap 20 is adjusted and press-fitted in the same manner as described above,
0A from inside the first hole 21a of the pressure adjustment cap mounting hole 21
The wedge is expanded to the side toward the inner peripheral wall of the wedge. The elastic ring member 13 is disposed in the annular groove 20C of the pressure regulating cap 20, and the space between the second hole 21b and the elastic ring support cylindrical portion 20B is air-tightly held by the elastic ring member 13, thereby. The liquid in the valve body 8 is pressed into the press-fitting cylinder 2
Leakage to the outside of the valve body 8 through the space between 0A and the first hole 21a is suppressed.

According to the present embodiment, when the elastic ring member 13 is disposed in the second hole 21b, the elastic ring member 13 contracts and deforms and presses the annular groove 20C inward, but forms the annular groove 20C. Since the elastic ring support cylindrical portion 20B thus formed is formed in a solid shape, the inward deformation of the annular groove 20C is completely suppressed, and the airtight maintenance by the elastic ring member 13 is not hindered.

[0022]

According to the present invention, the pressure adjusting cap is formed by a press-fitting cylindrical portion having a thin cylindrical shape and an elastic ring support cylindrical portion for supporting the elastic ring member on the outer periphery thereof. The press-fitting cylinder portion is wedge-fitted toward the inner peripheral wall of the pressure-regulating cap mounting hole, while the elastic ring support cylindrical portion is inserted and disposed in the pressure-regulating cap mounting hole. Since the elastic ring member is contracted and disposed between the inner peripheral wall and the elastic ring support cylinder, the liquid is prevented from leaking to the outside through the pressure adjustment cap mounting hole from inside the valve body, and particularly, the press-fit cylinder and In the pressure adjusting cap mounting hole, it is sufficient that an appropriate press-fitting load is obtained, and it is not necessary to consider any leakage at the press-fitting portion, so that the production efficiency can be improved. Further, according to the elastic ring member being contracted and arranged between the elastic ring support cylindrical portion and the pressure adjusting cap mounting hole, a force acts to change the position of the elastic ring member toward the pressure adjusting cap. However, in the present invention, the press-fitting cylinder portion of the pressure-adjusting cap is press-fitted into the pressure-controlling cap mounting hole, and the press-fitting cylindrical portion is wedge-fitted toward the inner peripheral wall of the pressure-regulating cap mounting hole to increase the fixing strength. Therefore, even if the force of the elastic ring member is applied, the pressure adjusting cap does not move after the adjustment, and the set load of the valve body spring does not change, so that a linear solenoid valve having accurate dynamic characteristics can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a linear solenoid valve according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an enlarged sectional view showing a modification of the main part of FIG. 1;

[Explanation of symbols]

 Reference Signs List 8 Valve body 9 Spool valve body 10 Pressure adjusting cap mounting hole 11 Pressure adjusting cap 11B Press-fitting cylinder 11C Elastic ring support cylinder 13 Elastic ring member

Claims (3)

[Claims] 1. A solenoid valve (S) disposed at one end (8A) of a valve body (8), and a spool valve urged in another direction (A) in a valve support hole (7) of the valve body (8) by electromagnetic thrust generated in the solenoid part (S). The body 9 is movably arranged, and the other end 8B of the valve body 8
Pressure adjustment cap 1 in pressure adjustment cap mounting hole 10
1 is fixedly arranged, and the pressure regulating cap 11 and the spool valve element 9
A linear solenoid valve contracted with a valve body spring 12 that presses the spool valve body 9 in one direction B.
The pressure adjustment cap 11 is a press-fitting cylindrical portion 11B having a thin cylindrical shape.
And an elastic ring support cylindrical portion 11C that supports the elastic ring member 13 on its outer periphery. The press-fit cylindrical portion is press-fitted into the pressure adjusting cap mounting hole 10 and the press-fit cylindrical portion 1 is formed.
1B is wedge-fitted toward the inner peripheral wall 10B of the pressure adjustment cap mounting hole 10, while the elastic ring support cylindrical portion 11C is inserted and disposed in the pressure adjustment cap mounting hole 10, and the inner peripheral wall of the pressure adjustment cap mounting hole 10 is provided. A linear solenoid valve, characterized in that an elastic ring member 13 is contracted and arranged between an elastic ring supporting tubular portion 10C and an elastic ring supporting cylindrical portion 11C. 2. The linear solenoid according to claim 1, wherein the pressure adjusting cap is formed in a thin cylindrical shape with a bottom, and the outer diameter E of the elastic ring support cylindrical portion 11C is smaller than the outer diameter F of the press-fitting cylindrical portion 11B. valve. 3. The press-fitting cylindrical portion 20A of the pressure adjusting cap,
The elastic ring supporting cylinder 20 is formed in a thin cylindrical shape.
B is formed in a solid shape, and an annular groove 20C for accommodating the elastic ring member 13 is formed in the outer periphery of the elastic ring support cylinder 20B, and the outer diameter E of the elastic ring support cylinder 20B is changed to the outer diameter of the press-fit cylinder 20A. The linear solenoid valve according to claim 1, wherein the diameter is smaller than F.