JP2004286097A - Solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid valve 1 with a ball guide 7 having improved assembling property and ease of manufacture and lower cost by effectively utilizing the outer periphery of the ball guide 7 as a flow path for fluid. <P>SOLUTION: The solenoid valve 1 comprises a valve chamber 25 having an inflow valve port 11 and a discharge valve port 13 opposed to each other and an outflow port 12 at the side, a ball valve 16, the ball guide 7 fitted into the valve chamber 25 for holding the ball valve 16 formed midway between the inflow valve port 11 and the discharge valve port 13, a shaft 4 for displacing the ball valve 16, and an electromagnetic solenoid 3 for driving the shaft 4. Between the outer periphery of the ball guide 7 and the inner wall of the valve chamber 25, the annular flow path 8 is provided in communication with the outflow port 12 independently of the installation angle of the ball guide 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a solenoid valve mounted on a hydraulic control device or the like and used for switching a flow path.
[0002]
[Prior art]
In an automatic transmission mounted on an automobile or the like, a flow path is switched by mounting an electromagnetic valve on a hydraulic control device. In the solenoid valve, an inflow valve port and an exhaust valve port are provided to face each other, and a cylindrical valve chamber provided with an outflow port on the side, an inflow valve port or an exhaust valve housed in the valve chamber. A ball valve for selectively opening and closing the port, a cylindrical ball guide fitted into the valve chamber and holding the ball valve at the center of the inflow valve port and the discharge valve port, a shaft for displacing the ball valve, and the shaft Some include an electromagnetic solenoid to be driven.
[0003]
As shown in FIG. 6A, the conventional solenoid valve includes a cylindrical ball guide 7 for holding a ball valve 16 moved left and right by a shaft 4 on the center line of a valve chamber 25. . The ball guide 7 has an outer diameter fitted to the valve chamber 25 and has a communication port 70 corresponding to the outlet 12 opened to the side of the valve chamber 25 as shown in FIG. Is provided (see Patent Document 1). When the ball guide 7 rotates in the valve chamber 25, as shown in FIG. 6C, the position of the communication port 70 and the outlet 12 is shifted, and the outlet 12 is closed by the ball guide 7. For this reason, it is necessary to fix the communication port 70 and the outflow port 12 so that the positions thereof are aligned, to perform accurate assembly, and to perform a detent such as caulking between the base housing 2 and the like. Have been.
[0004]
[Patent Document 1]
JP-A-10-292879 (FIG. 1)
[0005]
[Problems to be solved by the invention]
In the conventional solenoid valve, since the ball guide 7 requires the structural strength required for accurate assembling and fixing, it is made of metal, so that the assembling work and manufacturing are troublesome and cost increases.
SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic valve that can improve the assemblability of a ball guide, can be easily manufactured, and can reduce the cost by effectively utilizing the outer periphery of the ball guide as a fluid flow path.
[0006]
[Means for Solving the Problems]
In the solenoid valve of the present invention, the inflow valve port and the discharge valve port are provided concentrically facing each other, and the inflow valve port or the discharge valve port is selectively provided in a cylindrical valve chamber provided with an outflow port on the side. The ball valve which opens and closes is housed. The ball valve is held on the center line by a cylindrical ball guide provided with a communication port communicating with the inflow valve port and the discharge valve port. The ball valve is displaced by a shaft driven by an electromagnetic solenoid. An annular flow path communicating with the outlet and the communication port is provided between the outer periphery of the ball guide and the inner wall of the valve chamber regardless of the installation angle of the ball guide.
[0007]
According to the present invention, when the ball valve closes the discharge valve port, the fluid flowing from the inflow valve port flows out to the outflow port through the communication port and the annular flow path. When the ball valve closes the inflow valve port, the gas flows out from the outflow port to the drain port through the annular flow path and the communication port. Since the annular flow path is always in communication with the outlet regardless of the installation angle of the ball guide, this operation can be ensured without the necessity of precisely setting and fixing the installation angle of the ball guide. As a result, assemblability of the ball guide is improved, and the ball guide can be formed of a resin having excellent productivity.
[0008]
In the solenoid valve according to the second aspect, the ball guide is formed of a resin, has an outer diameter smaller than the inner diameter of the valve chamber, and has a slit formed as a communication port between the annular flow path and the discharge valve port. And a flange provided at the end of the cylindrical portion on the inflow valve port side, and formed with a notch portion serving as a communication port between the inflow valve port and the annular flow path, and having an outer diameter equivalent to the inner diameter of the valve chamber. Consists of With this configuration, a compact valve chamber with low flow resistance can be formed.
[0009]
In the solenoid valve according to the third aspect, the ball guide is fitted into one end of the valve chamber to form a side wall, and is held in the valve chamber by a ring plate having an inflow valve port at the center. In this configuration, since the ball guide is assembled by fixing the ring plate, the axial load applied to the ball guide can be eliminated, and the ball guide can be formed of a material having low structural strength such as resin. Become.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described based on an embodiment shown in the drawings. FIG. 1 shows a solenoid valve 1 mounted on an automatic transmission of an automobile. The electromagnetic valve 1 has a cylindrical base housing 2 provided with a ball valve mechanism 10 at one end (left end in the figure), and an electromagnetic solenoid 3 fitted externally to one end (right end in the figure) of the base housing 2. . A shaft 4 is housed inside the base housing 2, and is reciprocated by the electromagnetic solenoid 3 to open and close the ball valve mechanism 10.
[0011]
Inside the base housing 2, a large-diameter filter chamber 21 is provided at one end, and the oil filter 5 is fitted therein. A ring plate mounting portion 23 having a slightly smaller diameter is provided on the right side of the filter chamber 21 via a step 22, and the ring plate 6 having the inlet valve port 11 opened at the center is fitted. The ring plate 6 is fixed by caulking a part 6A of the step 22.
[0012]
On the right side of the ring plate mounting portion 23, a cylindrical valve chamber 25 is provided via a step 24, a working fluid outlet 12 is opened on the side of the valve chamber 25, and on the right end of the valve chamber 25 A discharge valve port 13 is formed. The cylindrical ball guide 7 is fitted into the valve chamber 25, and the ball valve 16 is accommodated in the ball guide 7 to form the ball valve mechanism 10. A discharge channel 14 and a shaft holding portion 26 are formed on the right side of the discharge valve port 13, and a discharge port 15 intersects and penetrates the discharge channel 14.
[0013]
The electromagnetic solenoid 3 has a structure in which a coil 32 is disposed inside a yoke 31 and a mover 33 is disposed at one end of the coil 32. The shaft 4 is slidably fitted into the shaft holding portion 26 via a small-diameter tip portion 41 concentrically located at the discharge valve port 13, a tapered portion 42 located at the discharge flow path 14, and a step 43. It consists of a major part 44. A spring 45 is interposed between the step 43 and the discharge valve port 13.
[0014]
As shown in FIGS. 2 and 3, the ball guide 7 is formed of a resin such as PPS resin, and includes a cylindrical portion 72 and a flange portion 74 provided at one end thereof. In the cylindrical portion 72, three axial slits 71 are formed at regular intervals from the intermediate portion to the other end portion, and serve as the other end side communication port. The flange portion 74 is formed with three missing portions 73 alternately with the slits 71 and serving as one end side communication ports. In this embodiment, the missing portion 73 is extended to one end of the cylindrical portion 72 to increase the area of the flow path of the communication port. In this configuration, since the communication port is divided into the slit 71 (the other end communication port) and the cutout portion 73 (the one end communication port), a compact and low flow resistance flow path switching valve is formed. I have.
[0015]
The ball guide 7 is housed in the valve chamber 25 with its flange 74 (one end) in contact with the ring plate 6 and the other end in contact with the other side wall of the valve chamber 25. Regardless of the installation angle of the ball guide 7, the gap between the outer periphery of the cylindrical portion 73 and the inner peripheral wall of the valve chamber 25 always communicates with the slit 71 and the missing portion 73, which are communication ports, and the outlet 12. The annular flow path 8 is formed.
[0016]
When the electromagnetic solenoid 3 is in a non-energized state, the ball valve 16 is located on the right side in the drawing by the action of hydraulic pressure, and opens the inlet valve port 11 and closes the outlet valve port 13. For this reason, the inflow valve port 11 communicates with the outflow port 12 through the missing portion 73 and the annular flow path 8. When the electromagnetic solenoid 3 is energized, the mover 33 is displaced leftward in the figure, and is pressed by the mover 33 to move the shaft 4 leftward in the figure. The ball valve 16 is pressed by the shaft 4 and displaces to the left in the drawing, closing the inflow valve port 11 and opening the discharge valve port 13. Therefore, the outlet 12 communicates with the discharge valve port 13 through the annular flow path 8 and the slit 71.
[0017]
In the present invention, since the annular flow path 8 is formed between the ball guide 7 and the valve chamber 25, the slit 71 communicates with the outlet 12 regardless of the installation angle of the ball guide 7 in the valve chamber 25. are doing. For this reason, when assembling the ball guide 7 to the valve chamber 25, it is not necessary to specify the installation angle of the ball guide 7, and the assemblability is improved. Further, since the ball guide 7 can be rotated, it is not necessary to fix the ball guide 7, and the structural strength of the ball guide 7 may be low. For this reason, it can be molded with resin, and the manufacturing cost can be reduced as compared with the case of metal.
[0018]
FIG. 4A shows the ball guide 7 provided with four slits 71 and four missing portions 73, respectively. The number of the slits 71 or the missing portions 73 may be other than three, but is preferably three or more in order to secure a short flow path even when the ball guide 7 rotates in the valve chamber 25. From the viewpoint of the strength of the ball guide 7, it is desirable that the number is four or less. With this configuration, stability when mounted in the valve chamber 25 can be improved. 4 (b) and 4 (c) show the ball guide 7 in which the flange portions 74, 74 are provided on both sides of the cylindrical portion 72. FIG. With this configuration, stability when mounted in the valve chamber 25 can be improved.
[0019]
FIG. 5 shows another embodiment of the solenoid valve 1. In this embodiment, a ring plate 61 having a discharge valve port 13 is fitted into one end of the valve chamber 25. In this configuration, the shaft 4 and the spring 45 can be assembled from the valve chamber 25 side, so that the assemblability can be improved.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a solenoid valve.
2 is a sectional view taken along line AA of FIG. 1 (a) and a sectional view taken along line BB of FIG. 1 (b).
FIG. 3 is a perspective view of a ball guide.
FIG. 4 is a perspective view of a ball guide according to another embodiment.
FIG. 5 is a front sectional view of a solenoid valve according to another embodiment.
FIG. 6 is a sectional view of a solenoid valve according to another embodiment.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 solenoid valve 10 ball valve mechanism 11 inflow valve port 12 outflow port 13 discharge valve port 16 ball valve 2 base housing 25 valve chamber 3 electromagnetic solenoid 4 shaft 5 oil filter 6 ring plate 7 ball guide 71 slit (communication port on the other end side) )
72 Tube part 73 Missing part (communication port on one end side)
74 collar 8 annular channel

Claims (3)

An inflow valve port and a discharge valve port are provided concentrically facing each other, and a cylindrical valve chamber provided with an outflow port on the side, and the inflow valve port or the discharge valve port housed in the valve chamber are selectively provided. A ball valve that opens and closes, and a communication port that is fitted into the valve chamber and holds the ball valve on a center line between the inflow valve port and the discharge valve port, and that communicates with the inflow valve port and the discharge valve port. A cylindrical ball guide, a shaft that displaces the ball valve, and an electromagnetic valve that includes an electromagnetic solenoid that drives the shaft.
An electromagnetic valve is provided between the outer periphery of the ball guide and the inner wall of the valve chamber, the annular flow path communicating with the outlet and the communication port regardless of the installation angle of the ball guide. 2. The solenoid valve according to claim 1, wherein the ball guide is formed of resin, has an outer diameter smaller than an inner diameter of the valve chamber, and has a slit serving as a communication port between the annular flow path and the discharge valve port. 3. A formed tubular portion is provided at an end of the tubular portion on the side of the inflow valve port, and a cutout portion serving as a communication port between the inflow valve port and the annular flow path is formed and is equal to the inner diameter of the valve chamber. And a flange portion having an outer diameter of: 2. The solenoid valve according to claim 1, wherein the ball guide is fitted into one end of the valve chamber to form a side wall, and is held in the valve chamber by a ring plate having the inflow valve port at the center. A solenoid valve.

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