JP2003254465A - Solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure a sealing property between an output port and a drain port, while shortening a distance between the output port and the drain port in an axial direction of a housing projecting potion. <P>SOLUTION: A projecting portion 30 of a housing 1 is fitted with a fitting hole 201 of a partner side installing portion 200. The output port 11 and the drain port 7 are formed at different position in a circumferential direction of the housing projecting portion 30, and the sealing property between the output port 11 and the drain port 7 can be ensured by the distance between the output port 11 and the drain port 7 in the circumferential direction of the housing projecting portion 30. Therefore, the distance between the output port 11 and the drain port 7 in the axial direction of the housing projecting portion 30 is shortened. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve, in particular, a valve body is formed at the tip of a movable rod integrally fastened to a movable core, and the stroke of the movable core is restricted by the stroke of the valve body. In this solenoid valve, the present invention relates to a solenoid valve which secures a sealing property between an output port and a drain port in a state where a tip portion of the solenoid valve is fitted in a hole of a mating mounting member and is downsized.

[0002]

2. Description of the Related Art A 3-port solenoid valve used as a hydraulic control valve for an automatic transmission and having a duty ratio controlled,
There is a solenoid valve described in Japanese Patent Laid-Open No. 10-292879. In this solenoid valve, the valve body is made of a ball, and two valve seats are arranged so as to sandwich the ball valve. A ball valve has a state in which it is pressed against one valve seat by a movable shaft and a state in which the movable shaft separates and receives the hydraulic pressure of high-pressure hydraulic oil and is pressed against the other valve seat. , The output port and the drain port are controlled to communicate with each other and to be cut off. By the control between the three ports, high-pressure hydraulic oil is supplied from the supply port to the clutch or brake via the output port to operate the clutch or brake, and
The hydraulic fluid in the clutch or brake is discharged to the drain port via the output port, and the clutch or brake is released.

[0003]

However, in the above-mentioned prior art, a relatively large noise is generated due to the fact that the movable core, which receives a magnetic attraction force when the coil is energized, comes into contact with the fixed core. There was a problem. In addition, since the stroke of the movable shaft is set to be larger than the stroke of the ball valve in order to reliably press the ball valve against the valve seat, useless movement time is generated on the movable shaft itself, and therefore it can be set. There is also a problem that the range of the duty ratio is limited and the dynamic range is relatively narrow.

In view of the above-mentioned problems of the prior art, the inventors of the present invention have proposed the basic invention (detailed in the section "Embodiment of the Invention" below) for the purpose of noise prevention and expansion of the dynamic range. Came to do. However, it has been found that this basic invention also has problems, and the present invention aims to solve the problems remaining in this basic invention (which will be described in detail in the section of "Modes of Invention" below). It was made as.

[0005]

Means for Solving the Problems Claims 1 and 2
According to the above, since the output port and the drain port are formed at different positions in the circumferential direction of the housing protrusion, the output port and the drain port when the housing protrusion is fitted into the mating hole of the mating mounting part The sealing property between them can be secured mainly by the length of the distance between the output port and the drain port in the circumferential direction of the housing protrusion. Therefore, the distance between the output port and the drain port in the axial direction of the housing protrusion can be shortened, which reduces the axial dimension of the housing protrusion and, in turn, the axial dimension of the solenoid valve as a whole. It is possible to shorten the size, that is, reduce the size of the solenoid valve.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The first and second embodiments of the basic invention on which the present invention is based are first described below, then the problems of this basic invention are explained, and finally the present invention. An embodiment will be described.

FIG. 5 is a sectional view of a solenoid valve according to the first embodiment of the basic invention.

In FIG. 5, a solenoid valve 100 according to the first embodiment of the basic invention comprises a housing 1 made of a magnetic material such as iron. The housing 1 has a shaft holding portion 2, and the shaft holding portion 2 holds the shaft portion 4 of the movable rod 3 in the shaft insertion hole 2a so as to be slidable in the axial direction. The movable rod 3 comprises a small-diameter shaft portion 4 and a large-diameter valve body portion 5 extending from the shaft portion 4 in the axial direction. The drain port 7 communicates with the shaft insertion hole 2a from the direction intersecting the axis. The valve seat portion 9 is formed with a drain port communication hole 10 that communicates with the shaft insertion hole 2a in the axial direction, and the drain port communication hole 10 has a smaller diameter neck portion near the valve body portion 5 of the shaft portion 4. 6 is inserted.

The housing 1 is formed with a recess 12 whose bottom wall is the valve seat 9. The tip opening of the recess 12 is configured as a supply port 13, and an output port 11 is formed on the side wall of the recess 12.

A valve plate 14 is inserted and fixed in the recess 12, and the valve plate 14 forms an output pressure chamber 8 together with the recess 12.

A valve body 5 is housed in the output pressure chamber 8.

The rear surface 5a of the valve body portion 5 can be seated on and released from the valve seat portion 9. When seated on the valve seat portion 9, the drain port communication hole 10 is closed and the output pressure chamber 8 and the drain port 8 are drained. 7, that is, the output port 11 and the drain port 7 are shut off, and when the valve seat 9 is separated, the drain port communication hole 10 is opened so that the output pressure chamber 8 and the drain port 7 are separated from each other. That is, the output port 11 and the drain port 7 are in communication with each other.

Further, the front surface 5b of the valve body 5 can be seated on and separated from the valve plate 14, and when seated on the valve plate 14, the supply port communicating hole 15 of the valve plate 14 is closed to supply the valve plate 14. The connection between the port 13 and the output pressure chamber 8, that is, the supply port 13 and the output port 11 is cut off. On the other hand, when the valve plate 14 is separated, the supply port communication hole 15 is opened to open the supply port 13 and the output pressure. The communication between the chamber 8 and the supply port 13 and the output port 11 is established.

The end portion 16 of the shaft portion 4 projects from the shaft insertion hole 2a of the housing 1, and the movable core 17 is fixed to the end portion 16 by caulking or the like. The maximum air gap Gmax between the magnetic attraction surface 18 of the movable core 17 on the housing 1 side and the magnetic attraction surface 19 of the movable core 17 on the movable core 17 side of the movable core 17 of the movable core 17 when the valve body 5 is seated on the valve plate 14. The magnetic attraction surface 18 is set to be slightly larger (for example, 0.1 mm) than the stroke L of the valve body portion 5 so as not to come into contact with the magnetic attraction surface 19 of the housing 1.

A cylindrical outer peripheral surface 20 of the movable core 17 has a yoke 2 fixed to the housing 1 by press fitting or caulking.
1 is opposed to the cylindrical inner peripheral surface 24 of the yoke side core 23 fixed by crimping the end portion 22 of 1.
The magnetic flux between 0 and 24 is made easy to flow.

Between the movable core 17 and the housing 1,
A return spring 25 that applies a spring force to the movable core 17 in a direction away from the housing 1 is provided. Further, between the movable core 17 and the thin-walled cylindrical adjuster 26 press-fitted and fixed to the inner wall of the yoke-side core 23,
A spring 27 that applies a spring force in the direction of moving the movable core 17 toward the housing 1 (however, this spring force is smaller than the spring force of the return spring 25) is provided. The spring force of the spring 27 is the adjuster 26.
Is adjustable by.

Other reference numerals 28 and 29 represent coils and terminals, respectively.

Next, the operation of the solenoid valve 100 according to the first embodiment of the basic invention constructed as described above will be explained.

When the coil 28 is not energized, the spring force of the return spring 25 is larger than the spring force of the spring 27, so that the movable core 17 receives the force in the direction of separating from the housing 1, and the valve body portion of the movable rod 3 is received. The valve seat 5 is separated from the valve plate 14 and seated on the valve seat portion 9. Therefore, the supply port communication hole 15 is opened, and the supply port 13 and the output port 11 are in a communication state,
On the other hand, the drain port communication hole 10 is closed and the output port 11 and the drain port 7 are shut off. At this time, the gap between the magnetic attraction surface 18 of the movable core 17 and the magnetic attraction surface 19 of the housing 1 is the maximum air gap Gmax.

When the coil 28 is energized, a magnetic attraction force is generated in the housing 1, the movable core 17 moves toward the housing 1 against the spring force of the return spring 25, and the valve body portion 5 of the movable rod 3 moves. It moves away from the valve seat 9 until it seats on the valve plate 14. Therefore, the supply port communication hole 15 is closed and the supply port 13 and the output port 11 are shut off, while the drain port communication hole 10 is opened and the output port 11 and the drain port 7 are connected. It becomes a state. At this time, the magnetic attraction surface 18 of the movable core 17 and the magnetic attraction surface 19 of the housing 1
Gap becomes a value Gmax-L obtained by subtracting the stroke L of the valve body portion 5 from the maximum air gap Gmax.
The magnetic attraction surface 18 of 7 does not contact the magnetic attraction surface 19 of the housing 1.

When the energization of the coil 28 is stopped, the magnetic attraction force disappears, the spring force of the return spring 25 moves the movable core 17 in the direction away from the housing 1, and the valve body portion 5 of the movable rod 3 is valved. The seat 14 is separated from the plate 14 and seated on the valve seat 9. Therefore, the supply port 13 and the output port 11 are in a communication state, and the output port 11 and the drain port 7 are in a cutoff state.

The coil 28 is energized and de-energized repeatedly, and the movable rod 3 follows the energization and de-energization of the coil 28 to reciprocate at high speed. The ratio between the energized time and the non-energized time, that is, the duty ratio is variable, and the pressure in the output pressure chamber 8 can continuously change with respect to the duty ratio. During this operation, the movable core 1
Since the stroke of 7 corresponds to the stroke of the valve body portion 5 and the movable core 17 does not have a wasteful moving time, the movable rod 3 can be reciprocated at a higher speed, and the dynamic range of the output pressure characteristic is increased. Expanding. Further, since the movable core 17 does not come into contact with the housing 1, it is possible to prevent noise generated when the movable core 17 comes into contact with the housing 1.

FIG. 6 shows a sectional view of a solenoid valve according to a second embodiment of the basic invention.

In FIG. 6, the solenoid valve 100 according to the second embodiment of the basic invention is a normally closed solenoid valve, whereas the solenoid valve 100 according to the first embodiment of the basic invention is a normally open solenoid valve. .

A solenoid valve 10 according to a second embodiment of the basic invention.
0 is configured almost the same as the solenoid valve 100 according to the first embodiment of the basic invention (the same reference numerals as those shown in FIG. 5 in FIG. 6 are the same as those shown in FIG. 5). The magnetic attraction surface 19 is formed on the housing 1 in the first embodiment of the basic invention, whereas the magnetic attraction surface 42 is formed on the fixed core 40 in the second embodiment of the basic invention.
Are formed. The fixed core 40 corresponds to the yoke core 23 of the first embodiment of the basic invention.
Further, the return spring 25 applies a spring force to the movable core 17 in a direction away from the fixed core magnetic attraction surface 42.

In the solenoid valve 100 according to the second embodiment of the basic invention, when the coil 28 is not energized, the valve body portion 5 is separated from the valve seat portion 9 and seated on the valve plate 14 so that the supply port communicating hole is formed. 15 is closed, the drain port communication hole 10 is opened,
In addition, when the coil 28 is energized, the valve body 5 is closed by the valve plate 14
Is separated from the valve seat 9 to open the supply port communication hole 15 and close the drain port communication hole 10, and when the coil 28 is energized, the movable core magnetic attraction surface 18 and the fixed core magnetic attraction surface 42 are closed. And so that they do not abut.

Next, problems that remain in the solenoid valve 100 according to the first and second embodiments of the basic invention described above will be explained.

Solenoid valve 100 according to the first and second embodiments.
As shown in FIGS. 7 and 8, the protrusion 30 of the housing 1 is inserted into the fitting hole 201 of the mating mounting portion 200 at the depth d ′.
Is used to connect the supply port 13 and the output port 11 to the supply passage 202 and the output passage 203 of the mating attachment part 200, respectively, and to open the drain port 7 to the atmosphere.

However, in the solenoid valve 100 according to the first and second embodiments, as shown in FIGS. 5 and 6, the output port 1
1 and the drain port 7 are formed at the same position in the circumferential direction of the housing protrusion 30.

Therefore, in the solenoid valve 100 according to the first and second embodiments, in order to secure the sealing property between the output port 11 and the drain port 7, the output port 11 and the drain are arranged in the axial direction of the housing protrusion 30. The distance between the ports 7 is set to be long, the axial dimension S ′ of the housing protruding portion 30 is increased, and the mounting surface 20 of the mating mounting portion 200 is increased.
The distance L'from 4 to the rear surface of the solenoid valve 100 is also large, and there is a problem that the space on the rear end side of the solenoid valve 100 is limited. Further, it is not preferable to increase the size of the movable rod 3 that requires high responsiveness, and therefore, the valve body 5 should be prevented from increasing in size. Therefore, the axial distance between the output port 11 and the drain port 7 is set to be long. Accordingly, the supply port communication hole 15 of the valve plate 14 must be arranged near the valve body portion 5, and therefore the shape of the valve plate 14 is
There is also a problem in terms of processing and cost that the cap has a relatively complicated shape as shown in FIGS.

The present invention has been made for the purpose of solving the remaining problems of the basic invention as described above.

FIG. 1 is a sectional view of a solenoid valve according to a first embodiment of the present invention, which is an improvement of the solenoid valve 100 according to the first embodiment of the basic invention, and FIG. 2 is a second embodiment of the basic invention. The sectional view of the solenoid valve which concerns on 2nd Embodiment of this invention which improved the solenoid valve 100 which concerns on is shown.

The solenoid valve 100 according to the first and second embodiments of the present invention is different from the solenoid valve 100 according to the first and second embodiments of the basic invention described above in that the structure on the side of the protruding portion 30 of the housing 1 is different. Although different, the other configurations are the same, and the same reference numerals as those shown in FIGS. 5 and 6 in FIGS. 1 and 2 denote the same as those shown in FIGS. 5 and 6. .

In FIG. 1 and FIG. 2, the output port 11
The drain port 7 and the drain port 7 are formed relatively close to each other in the axial direction of the housing protrusion 30, and are formed with a gap in the circumferential direction of the housing protrusion 30. This deviation is preferably an angle difference of 180 °. Further, the valve plate 14 is formed in a flat shape.

Similar to the solenoid valve 100 according to the basic invention, the solenoid valve 100 according to the present invention, as shown in FIGS. 3 and 4, has the housing protrusion 30 and the depth d (d = d) of the mating mounting portion 200. ′) Fitted in the fitting hole 201, supply port 1
3 and the output port 11 to the other side mounting portion 200
The drain port 7 is used by being communicated with the supply passage 202 and the output passage 203.

In the case of the solenoid valve 100 according to the present invention, the distance between the output port 11 and the drain port 7 with respect to the circumferential direction of the housing protrusion 30 is determined by the solenoid valve 100 according to the basic invention.
Long enough compared to. Therefore, even if the distance between the output port 11 and the drain port 7 in the axial direction of the housing protrusion 30 is set to be short, it is possible to sufficiently secure the sealing property between the output port 11 and the drain port 7. Therefore, in the solenoid valve 100 according to the present invention, the position of the output port 11 with respect to the axial direction of the housing protrusion 30 is brought closer to the drain port 7, and the axial dimension S (S <S ′) of the housing protrusion 30 is set. It is shortening. Further, as the axial dimension S is shortened, the distance L (L <L ′) from the mounting surface 204 of the mating mounting portion 200 to the rear surface of the solenoid valve 100 is also shortened, and the rear end side of the solenoid valve 100 is reduced. I had more room. Also, output port 11
The valve plate 14 can be simplified into a flat shape by bringing the valve plate 14 closer to the drain port 7 in the axial direction of the housing protrusion 30. By shortening the axial dimension S of the housing protruding portion 30, the drain port 7 is also inserted into the fitting hole 201 of the mating mounting portion 200, so the drain port 7 is opened to the mating mounting portion 200 to the atmosphere. Although it is necessary to form the groove 205 for making it work, since the mating side mounting portion 200 is usually molded by a mold, it does not cause a big problem in processing.

[0037]

According to the present invention, since the distance between the output port and the drain port in the axial direction of the housing protrusion can be shortened and the sealing property between the output port and the drain port can be ensured, the housing protrusion can be secured. The axial dimension of the solenoid valve can be shortened, and the axial dimension of the entire solenoid valve can be shortened, that is, the solenoid valve can be downsized.

[Brief description of drawings]

FIG. 1 is a sectional view of a solenoid valve according to a first embodiment of the present invention, which is an improvement of the solenoid valve according to the first embodiment of the basic invention.

FIG. 2 is a sectional view of a solenoid valve according to a second embodiment of the present invention, which is an improvement of the solenoid valve according to the second embodiment of the basic invention.

FIG. 3 is a cross-sectional view showing a state where the solenoid valves according to the first and second embodiments of the present invention are attached to a mating attachment portion.

4 is a sectional view taken along the line AA, a sectional view taken along the line BB, and a sectional view taken along the line CC of FIG.

FIG. 5 is a sectional view of a solenoid valve according to the first embodiment of the basic invention.

FIG. 6 is a sectional view of a solenoid valve according to a second embodiment of the basic invention.

FIG. 7 is a cross-sectional view showing a state where the solenoid valve according to the first and second embodiments of the basic invention is attached to a mating attachment portion.

8 is a sectional view taken along the line DD of FIG. 7 and a sectional view taken along the line EE.

[Explanation of symbols]

1 housing 2 Shaft holding part 2a shaft insertion hole 3 Movable rod 4 Shaft 5 Valve body 5a Rear of valve body 5b Front of valve body 7 drain port 8 Output pressure chamber 9 valve seat 10 Drain port communication hole 11 output ports 12 recess 13 Supply port 14 valve plate 15 Supply port communication hole 17 movable core 18 Magnetic attraction surface of movable core 19 Magnetic suction surface of housing 25 Return spring 28 coils 30 Housing protrusion 41 fixed core 42 Magnetic attraction surface of fixed core 100 solenoid valve 200 Opposite side mounting part 201 Fitting hole

Continued front page    F-term (reference) 3H106 DA08 DA23 DB02 DB12 DB22                       DB32 DC02 DC18 DD03 EE34                       GB01 KK03

Claims (2)

[Claims] 1. A movable rod comprising a shaft portion and a valve body portion extending in the axial direction from the shaft portion, and a movable core assembled and fixed to the shaft portion, the rod being orthogonal to the axis or conical. A movable core having a magnetic attraction surface, a shaft holding portion that holds the shaft portion in the shaft insertion hole slidably in the axial direction, and a drain port that communicates with the shaft insertion hole from a direction intersecting the axis line, A drain port communication hole is formed that communicates with the shaft insertion hole in the axial direction, and the drain port communication hole has a valve seat portion opened and closed by the rear surface of the valve body portion, and the valve seat portion serves as a bottom wall. It has a concave portion, a supply port formed by a tip end opening of the concave portion, an output port formed on a side wall of the concave portion, and a magnetic attraction surface facing the movable core magnetic attraction surface. A housing and a valve plate that is inserted and fixed in the recess from the supply port side to form an output pressure chamber together with the recess, the valve plate having a supply port communication hole that is opened and closed by the front surface of the valve body portion; A return spring that applies a spring force to the movable core in a direction away from the housing magnetic attraction surface, the protruding portion of the housing is fitted in a fitting hole of a mating mounting portion, and when the coil is not energized, The valve body portion is separated from the valve plate and abuts the valve seat portion to open the supply port communication hole and close the drain port communication hole, and when the coil is energized, the valve body portion is It separates from the valve seat portion and contacts the valve plate to close the supply port communication hole, open the drain port communication hole, and when the coil is energized, the movable core magnetic absorption A solenoid valve configured to prevent the surface and the housing magnetic attraction surface from contacting each other, wherein the output port and the drain port are formed at different positions in the circumferential direction of the housing protrusion. Characteristic solenoid valve. 2. A movable rod comprising a shaft portion and a valve body portion extending in the axial direction from the shaft portion, and a movable core assembled and fixed to the shaft portion, which is orthogonal to the axis or conical. A movable core having a magnetic attraction surface, a shaft holding portion that holds the shaft portion in the shaft insertion hole slidably in the axial direction, and a drain port that communicates with the shaft insertion hole from a direction intersecting the axis line, A drain port communication hole is formed that communicates with the shaft insertion hole in the axial direction, and the drain port communication hole has a valve seat portion opened and closed by the rear surface of the valve body portion, and the valve seat portion serves as a bottom wall. A housing having a recess, a supply port formed by an opening at the tip of the recess, and an output port formed on a side wall of the recess, and a housing inserted into the recess from the supply port side. A valve plate that defines an output pressure chamber together with the recess and that has a supply port communication hole that is opened and closed by the front surface of the valve body; and a magnetic plate that faces the movable core magnetic attraction surface. A fixed core having a suction surface; and a return spring that applies a spring force to the movable core in a direction away from the fixed core magnetic attraction surface, and the projecting portion of the housing is fitted into the fitting hole of the mating mounting portion. When the coil is de-energized, the valve body is separated from the valve seat and abuts the valve plate to close the supply port communication hole, open the drain port communication hole, and energize the coil. At this time, the valve body portion is separated from the valve plate and abuts the valve seat portion to open the supply port communication hole, close the drain port communication hole, and when the coil is energized, A solenoid valve configured such that the movable core magnetic attraction surface and the fixed core magnetic attraction surface do not come into contact with each other, wherein the output port and the drain port are formed at different positions in the circumferential direction of the housing protrusion. Solenoid valve characterized by being.