JP2002195439A - Solenoid valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve device preventing a change of flow control characteristics and a defective operation with a simple structure. SOLUTION: An adjuster pipe 50 is screwed to the inner peripheral side of a fixed core 21 to adjust the energizing force of a spring. The male screw section 51 of the adjuster pipe 50 is screwed to a female screw section 210 formed on the inner peripheral side of the side core 21. Rib sections 52 extending in the axial direction are formed at a plurality of positions in the peripheral direction on the male screw section 51. Since the rib sections 52 are the incomplete screw sections of the male screw section 51, they are threaded by the female screw section 210 when they are screwed to the inner peripheral side of the fixed core 21, thereby the female screw section 210 and the rib sections 52 are meshed with each other, and a backlash caused by the play of the screw sections is prevented without applying an adhesive and seal agent. A change of flow control characteristics caused by the change of the energizing force of the spring due to the backlash can be prevented, and the defective operation caused by the infiltration of a seal member 53 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a solenoid valve device for opening and closing a fluid passage.

[0002]

2. Description of the Related Art Conventionally, a flow control means such as an idle speed control valve (hereinafter, an idle speed control valve is referred to as "ISCV") for controlling an intake flow rate in an intake bypass passage during an idle operation of an engine is electromagnetically controlled. A valve device is used. In the solenoid valve device, the electromagnetic attraction force of the magnetic circuit formed around the coil portion, the shape of the fixed core or the movable core, and the biasing force of the biasing means such as a spring for biasing the movable core are provided for each individual. Different. Therefore, it is necessary to adjust the urging force of the urging means by the urging force adjusting member for each individual to adjust the flow rate characteristics. As the biasing force adjusting member, for example, an adjuster pipe disposed inside the fixed core is used. The adjuster pipe has a male screw portion that can be screwed to a female screw portion formed on the inner peripheral side of the fixed core. By adjusting the amount by which the adjuster pipe is screwed into the inner peripheral side of the fixed core, the urging force of the urging means is adjusted.

[0003]

Conventionally, a mech agent has been applied to the male screw portion of the adjuster pipe. After the adjuster pipe is screwed into the inner peripheral side of the fixed core, this mech agent solidifies to fill the gap formed between the male screw portion and the female screw portion. This prevents the sealant applied to the biasing means side of the adjuster pipe from entering the valve member side, and prevents malfunction of the valve member due to solidification of the sealant. The mech agent also has a function of preventing movement of the adjuster pipe by solidifying and preventing a change in the urging force of the urging means.

[0004] However, since the mech agent is applied to the male screw portion of the adjuster pipe, the mech agent may be peeled off when the adjuster pipe is screwed into the fixed core. When the mech agent is peeled off, the mech agent does not remain between the male screw portion and the female screw portion, and play may occur due to play between the male screw portion and the female screw portion, that is, backlash may occur. Further, since the urging force adjusting member moves and the urging force of the urging means changes due to the peeling of the mech agent, the flow control characteristic of the solenoid valve device may change before and after the urging force adjustment. Furthermore, the sealant applied to the biasing means side of the adjuster pipe invades the movable part,
Operation failure may occur. In addition, since the mech agent is applied to the adjuster pipe, a step of applying the mech agent is required, which leads to an increase in man-hours and an increase in cost.

An object of the present invention is to provide a solenoid valve device which has a simple structure and prevents a change in flow control characteristics and a malfunction.

[0006]

According to the solenoid valve device of the first aspect of the present invention, the urging force adjusting member has a rib portion on the male screw portion. The rib portion is formed to extend in the axial direction at a plurality of positions in the circumferential direction of the male screw portion. This rib part
An incomplete thread is formed on the male thread. for that reason,
When the male thread of the urging force adjusting member is screwed into the female thread of the fixed core, the rib is threaded by the female thread.
As a result, the female screw portion is stuck into the rib portion, and the joint is stopped without forming a gap between the female screw portion and the rib portion. Thus, no mech agent is required. Therefore, the invasion of the sealant to the movable core side of the male screw portion, that is, the movable portion side is prevented, and operation failure can be prevented with a simple structure.

[0007] Further, since no gap is formed between the female screw portion and the rib portion, rattling due to play between the fixed core and the urging force adjusting member does not occur. As a result, it is possible to prevent a change in the urging force of the urging means due to the backlash. Therefore, a change in the flow control characteristics can be prevented with a simple structure.

According to the solenoid valve device of the second aspect of the present invention, the annular collar portion is disposed in the circumferential direction on the fixed core side of the biasing force adjusting member. The annular collar prevents the cutting pieces and the like generated by the rib portion being threaded by the female screw portion from entering the movable portion. Therefore, it is possible to prevent the occurrence of operation failure of the valve member due to the cutting pieces or the like.

According to the electromagnetic valve device of the third aspect of the present invention, the axial length of the annular collar is formed larger than the thread pitch of the female thread. Therefore, even when the screwing amount of the urging force adjusting member is different for each individual, the gap between the top of the female screw portion and the annular collar portion can always be reduced, such as a cutting piece generated by screwing the urging force adjusting member. Can be reliably prevented from entering the movable portion.

According to the electromagnetic valve device of the present invention, the movable core side of the female screw portion formed on the fixed core faces the urging force adjusting member without any step. Therefore, a gap formed between the fixed core and the urging force adjusting member is reduced, and it is possible to prevent a cutting piece or the like generated by threading the rib portion from entering the valve member side.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; (First Embodiment) FIG. 2 shows an intake system using an electromagnetic valve device according to a first embodiment of the present invention as an ISCV. FIG.
4 schematically shows the operation of the ISCV 10 for opening and closing the intake bypass passage.

The intake air from which foreign matter has been removed by the air cleaner 1 is supplied to the engine 9 via the surge tank 8 during normal operation, in which the intake flow rate is controlled by the throttle valve 4 disposed in the intake passage 3. . The intake flow rate is measured by an air flow meter 2 disposed upstream of the throttle valve 4. During idling operation, the throttle valve 4 shuts off the intake passage 3, and the ISCV 10 controls the intake flow rate in the intake bypass passage 5 instead. The engine control device (hereinafter, the engine control device is referred to as “ECU”) 7 includes:
Detected signals such as the number of revolutions of the engine, the temperature of the cooling water, and the on / off state of the air conditioner SW are input, and the ISCV 10 is instructed on the optimal intake flow rate during idling.

As shown in FIG. 3, a fluid passage 60 communicating with the intake bypass passage 5 is formed inside the housing 11 of the ISCV 10. The fluid passage 60 is connected to the inflow port 6.
1 and an outlet 62. The valve seat 12 is formed on the inner wall of the housing between the inflow port 61 and the outflow port 62. The stator 20 includes a fixed core 21 and an end yoke 2.
2, the outer yoke 23 and the opposing yoke 24. Each member of the stator 20 is formed of a magnetic material such as iron, and forms a fixed magnetic circuit.

The movable core 30 is made of a magnetic material such as iron, and forms a magnetic circuit with the stator 20.
The shaft 41 of the valve member 40 is press-fitted and fixed to the movable core 30, and is inserted into a hollow portion of the opposed yoke 24. The movable core 30 can reciprocate together with the valve member 40.

The valve member 40 includes a shaft 41 press-fitted into the movable core 30, and a resin contact member 42 attached to one end of the shaft 41 and seated on the valve seat 12.
have. One end of the shaft 41 is slidably accommodated in an inner peripheral portion of an adjuster pipe 50 as an urging force adjusting member. The other end of the shaft 41 is
The shaft 41 is supported by a leaf spring 43 for centering the shaft 41. An outer peripheral portion of the leaf spring 43 includes the cover 13 and the opposing yoke 2.
4 is sandwiched. The movable core 30 and the valve member 40 constitute a mover.

One end of the spring 31 as the urging means contacts the adjuster pipe 50, and the other end contacts the movable core 30. The spring 31 urges the contact member 42 in a direction in which the contact member 42 sits on the valve seat 12, that is, a direction in which the fluid passage 60 is closed. When power is not supplied from the power supply unit (not shown) to the coil unit 71, the contact member 42 is in contact with the valve seat 12 by the urging force of the spring 31. Therefore, the fluid passage 60 is closed.

The coil portion 71 is wound around a bobbin 72 made of resin, and is disposed between the fixed core 21 and the opposing yoke 24 and the outer yoke 23. Electric power is supplied to the coil section 71 from a terminal 74 embedded in the connector 73.

Next, the adjuster pipe 50 as the urging force adjusting member will be described. Adjuster pipe 50
Are disposed on the inner peripheral side of the fixed core 21. As shown in FIGS. 1 and 4, a male screw portion 51 is formed on the outer peripheral side of the adjuster pipe 50. This male screw portion 51
It is screwed together with the female screw part 210 formed on the inner peripheral part of the fixed core 21 shown in FIG. Adjuster pipe 50
When assembling to the inner peripheral side of the fixed core 21, the urging force of the spring 31 is adjusted by adjusting the amount of screwing of the adjuster pipe 50. By adjusting the biasing force of the spring 31, the amount of movement of the movable core 30 is adjusted.

The male thread 51 of the adjuster pipe 50 is provided with a rib 52 as shown in FIG. The rib portions 52 are provided at a plurality of positions in the circumferential direction of the male screw portion 51, and are provided so as to extend in the axial direction of the adjuster pipe 50. That is, the rib portion 52 forms an incomplete screw portion in a part of the male screw portion 51. In this embodiment, the outer diameter of the rib portion 52 is the same as the outer diameter of the thread of the male screw portion 51. In the present embodiment, the ribs 52 are 90 ° in the circumferential direction.
Are arranged at equal intervals.

When the adjuster pipe 50 is screwed into the inner peripheral side of the fixed core 21, a part of the rib 52 is threaded by the female thread 210 of the fixed core 21 as shown in FIG.
Therefore, no gap is formed between the thread of the female screw portion 210 and the rib portion 52, and the joint is tightly stopped. At the end of the adjuster pipe 50 on the side opposite to the valve seat portion, a seal member 53 for preventing invasion of foreign matter into the valve seat portion 12 side and airtight leakage is provided. The seal member 53 is an oil-resistant resin such as a silicone resin.

Next, the operation of the ISCV 10 will be described. (1) When power is not supplied to the coil unit 71,
The shaft 41 is urged downward in FIG. 3 by the urging force of the spring 31. Therefore, the contact member 42 is seated on the valve seat 12. Thus, the fluid passage 60 is closed, and the intake air flow in the intake bypass passage 5 is blocked.

(2) When electric power is supplied to the coil section 71, a magnetic circuit is formed around the coil section 71, and an electromagnetic attraction force is generated between the fixed core 21 and the movable core 30.
Thereby, the movable core 30 is attracted to the fixed core 21 against the urging force of the spring 31. Therefore, the contact member 42 is separated from the valve seat portion 12, and the fluid passage 60 is opened. As a result, intake air is supplied from the intake bypass passage 5 to the engine 9. The power supplied to the coil unit 71 is EC
The intake flow rate flowing through the intake bypass passage 5 is adjusted by the duty ratio control of U7.

As described above, in the first embodiment, the rib portion 52 is provided on the male screw portion 51 of the adjuster pipe 50. Since the rib portion 52 is an imperfect thread portion,
When the adjuster pipe 50 is screwed into the inner peripheral side of the fixed core 21, the adjuster pipe 50 is threaded by the female screw portion 210 of the fixed core 21. Therefore, the joint can be stopped without forming a gap between the female screw portion 210 of the fixed core 21 and the male screw portion 51 of the adjuster pipe 50. as a result,
The production cost can be reduced without the necessity of a mech agent or the like for joining. In addition, by stopping the joint, the seal member 53 applied on the side of the adjuster pipe 50 opposite to the spring can be prevented from entering the valve seat 12 and solidifying, thereby preventing malfunction.

In the first embodiment, the rib portion 52 is threaded by the female screw portion 210, so that the female screw portion 2 is formed.
There is no play between the male thread 10 and the male screw part 51 due to play. Therefore, it is possible to prevent a change in the flow control characteristic due to a change in the urging force of the spring 31 due to the backlash.

(Second Embodiment) FIG. 5 shows a second embodiment of the present invention.
Shown in Components that are substantially the same as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the second embodiment, an annular flange 54 is provided on the adjuster pipe 50.
The annular collar portion 54 is disposed on the movable core 30 side of the male screw portion 51, and is formed continuously on the outer peripheral portion of the adjuster pipe 50 in the circumferential direction. The annular collar portion 54 is formed so as to protrude from the outer peripheral portion of the adjuster pipe 50 to such an extent that the annular collar portion 54 does not come into contact with the top 210 a of the thread of the female screw portion 210.

The length of the annular collar 54 in the axial direction of the adjuster pipe 50 is formed larger than the thread pitch of the female thread 210 of the fixed core 21. By forming the annular collar portion 54 to be larger than the screw pitch of the female screw portion 210, even when the amount of screwing of the adjuster pipe 50 differs for each individual member, the crest 2 of the screw thread of the female screw portion 210 can be obtained.
10a always faces the top 54a of the annular collar 54.
As a result, the thread of the female screw 210 and the annular collar 54
Can be reduced.

By arranging the annular flange 54 on the adjuster pipe 50, when the adjuster pipe 50 is screwed into the inner peripheral portion of the fixed core 21, the cutting piece 80 generated by the threading of the rib 52 causes the cutting piece 80 generated by the spring 31 To prevent intrusion into Thereby, it is possible to prevent the cutting pieces 80 from entering the movable portion such as the contact member 42 and causing a malfunction. In the second embodiment, by disposing the annular collar portion 54, the intrusion of the cutting piece 80 into the movable portion can be prevented, and malfunction can be reliably prevented.

(Third Embodiment) FIG. 6 shows a third embodiment of the present invention.
Shown in The same reference numerals are given to the same components as those in the first embodiment, and the description will be omitted. In the third embodiment, the valve seat 12 side of the female screw portion 210 of the fixed core 21 faces the outer peripheral portion of the adjuster pipe 50 without forming a step. Therefore, the inner peripheral side of the fixed core 21 and the outer peripheral side of the adjuster pipe 50 face each other in a state where the gap 90 formed therebetween is small. Fixed core 2
By reducing the gap 90 formed between the inner peripheral side of the first adjuster pipe 50 and the outer peripheral side of the adjuster pipe 50,
Is prevented from entering the spring 31 side of the cutting piece 80 generated by threading. Thereby, the cutting piece 8
0 can be prevented from entering the movable part and causing a malfunction. In the third embodiment, the gap 90 formed between the inner peripheral side of the fixed core 21 and the outer peripheral side of the adjuster pipe 50 is lengthened, so that the cutting pieces 80 are prevented from entering the movable part, and the operation is performed. Defects can be reliably prevented.

In the embodiments of the present invention described above, examples in which the solenoid valve device of the present invention is applied to an ISCV have been described. However, the present invention is not limited to the ISCV, and the present invention can be applied to any electromagnetic valve device that adjusts the urging force of the spring by the screwing amount of the adjuster pipe.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an ISCV according to a first embodiment of the present invention, and is an enlarged view of a portion I in FIG.

FIG. 2 is a schematic diagram showing an intake system using an ISCV according to a first embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating an ISCV according to a first embodiment of the present invention.

FIG. 4 is a schematic view showing an ISCV adjuster pipe according to the first embodiment of the present invention, wherein (A) is a side view,
(B) is the arrow view seen from the arrow B direction of (A).

5 is a cross-sectional view illustrating an ISCV according to a second embodiment of the present invention, and is an enlarged view of a portion corresponding to a portion I in FIG.

FIG. 6 is a cross-sectional view illustrating an ISCV according to a third embodiment of the present invention, and is an enlarged view of a portion corresponding to a portion I in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ISCV (electromagnetic valve device) 12 Valve seat part 21 Fixed core 30 Movable core 31 Spring (biasing means) 40 Valve member 50 Adjuster pipe (biasing force adjusting member) 51 Male screw part 52 Rib part 53 Seal member 54 Annular collar part 71 Coil section 210 Female thread

Claims (4)

[Claims] 1. A valve member for opening and closing a fluid passage by reciprocating, a movable core reciprocating with the valve member, and a female screw portion formed on an inner peripheral side, the movable core and a magnetic circuit. A coil portion for generating a magnetic force for attracting the movable core to the fixed core side by energizing; a biasing unit for biasing the movable core toward the valve member; On the outer peripheral side, a male screw portion capable of being screwed with the female screw portion is formed, and has a rib portion extending in the axial direction at a plurality of positions in the circumferential direction of the male screw portion, and screwed into the fixed core. And a biasing force adjusting member capable of adjusting the biasing force of the biasing means. 2. The solenoid valve device according to claim 1, wherein the biasing force adjusting member has an annular flange portion circumferentially disposed on the movable core side of the male screw portion. 3. The electromagnetic valve device according to claim 2, wherein an axial length of the annular collar portion is formed larger than a thread pitch of the female screw portion. 4. The movable core side of the female screw portion formed on the fixed core is formed so as to face the urging force adjusting member without a step. 3. The electromagnetic valve device according to 3.