JP3892148B2 - Pressure control valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure control valve used for hydraulic control of a hydraulic circuit, for example.
[0002]
[Prior art]
Conventionally, for example, an electromagnetic valve 51 shown in FIG. 6 is used in a hydraulic circuit of an automatic transmission of an automobile. This solenoid valve 51 is attached to a valve block 56 (see FIG. 8 ) in which a fluid path constituting a pressure circuit is formed inside (not shown) together with a plurality of other solenoid valves, and constitutes a control valve of an automatic transmission. It is a control valve.
[0003]
The electromagnetic valve 51 has a synthetic resin main body 5 integrally formed with a nozzle portion 2 fitted in the mounting hole 52 of the valve block 56 and a bobbin portion 4 wound with a solenoid 3. A metal plate 6, which is a circular plate member, is inserted on the proximal end side of the nozzle portion 2. An inflow port 7 is opened at the tip side of the nozzle portion 2. The inflow port 7 is communicated with the valve chamber 12 through an intermediate chamber 8, a communication passage 9, and a communication hole 11 that opens to the metal plate 6, which are sequentially and coaxially formed. The valve chamber 12 communicates with a drain port 13 that opens to the outer peripheral surface of the main body 5 that is exposed to the outside during use. The communication passage 9 opens to the outer peripheral surface of the nozzle portion 2 and is connected to the drain plate 13 by the metal plate 6. A portion communicates with the output port 14 formed therein.
[0004]
On the outer peripheral surface of the main body 5, a first mounting groove 15 is provided between the exposed portion 6 a of the metal plate 6 that protrudes outward and is exposed, and the drain port 13, and the front end side of the nozzle portion 2 with respect to the output port 14. Is provided with a second mounting groove 16. First and second O-rings 17 and 18 are mounted in the first and second mounting grooves 15 and 16, respectively. Thus, in a state where the electromagnetic valve 51 is fitted in the valve block 56, a region where the inflow port 7 is opened and the metal plate 6 is exposed and a region where the output port 14 is opened on the outer peripheral surface of the nozzle portion 2. And oil tightness is secured.
[0005]
The intermediate chamber 8 accommodates a ball valve 19 that closes the communication passage 9 by the pressure on the inflow port 7 side and blocks the flow of oil from the inflow port 7 to the output port 14. The valve chamber 12 contains a valve body 21 that is pressed against the metal plate 6 by a spring 20 and shuts off the flow of oil from the output port 14 to the drain port 13 by closing the communication hole 11. Yes. The valve body 21 is provided with a push rod 22 that is loosely inserted into the communication hole 11 and the communication passage 9 and presses the ball valve 19 to release between the inflow port 7 and the output port 14. .
[0006]
That is, the solenoid valve 51 is a normally open three-way valve, which communicates the output port 14 with the inflow port 7 when the solenoid 3 is not excited, and simultaneously shuts off the oil flow to the output port 14 when the solenoid 3 is excited. The output port 14 communicates with the drain port 13, thereby controlling the pressure on the output port 14 side.
[0007]
On the other hand, in order to form the first mounting groove 15 to be undercut when the main body 5 is molded as described above, as shown in FIG. 7, a slide die 62 is provided on the lower die 61 forming the nozzle part 2 side. When the mold is opened after clamping, the slide mold 62 is moved in the drawing direction (the direction indicated by the arrow in FIG. 6). This also applies to the formation of the second mounting groove 16.
[0008]
In addition, since the first mounting groove 15 is partially formed by the exposed portion 6a of the metal plate 6 to be inserted, the surface 6b on the valve chamber 12 side of the exposed portion 6a forms the slide mold 62. It is a surface to be slid, and resin is not placed (filled) on the surface 6b of the exposed portion 6a at the time of molding, and the clearance between the slide mold 62 and the surface 6b of the exposed portion 6a becomes zero at the time of clamping.
[0009]
[Problems to be solved by the invention]
However, at the time of molding the main body 5 described above, for example, the metal plate 6 has a variation in dimension in the thickness direction (particularly the thickness dimension is large). For example, a force for separating the resin on the side is applied and the expansion coefficient of the synthetic resin is different from that of the metal. The molded body 5 has a valve of the metal plate 6 as shown in FIG. A gap L inevitably occurred on the chamber 12 side (drain port 13 side).
[0010]
For this reason, in the solenoid valve 51 described above, even in the fully closed state where the valve body 21 is moved to the fully closed position, there is oil leakage from the output port 14 to the drain port 13 through the gap L. It was difficult to reduce or eliminate leakage.
[0011]
The present invention has been made in view of such a conventional problem, and provides a pressure control valve capable of reducing or eliminating a slight amount of fluid leakage between ports separating a metal plate exposed on an outer peripheral portion of a main body. With the goal.
[0012]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is mainly a pressure control valve attached to a mating counterpart that forms a fluid path, and is exposed to a synthetic resin main body on the outer peripheral surface of the main body. A metal plate having an exposed portion is inserted, and a communication hole for opening and closing the valve body inside the main body is provided in the metal plate, and a first hole communicated with the outer peripheral surface of the main body through the communication hole. The first port is provided on the outer peripheral surface of the main body and the metal plate is exposed in a state where the first port and the second port are provided across the exposed portion and attached to the other side. Synthetic resin on the side where the second port is located in the portion of the metal plate embedded in the main body in a pressure control valve that ensures oil tightness between the region and the region where the second port is provided On the joint surface And it shall groove surrounding the hole is provided.
[0013]
In such a configuration, even if a gap is generated between the joint surface of the metal plate and the synthetic resin during molding of the main body, the path from the first port to the inside of the main body through the gap is as follows. This is longer than when no groove is provided. Moreover, for the gap formed between the side wall and the synthetic resin of the grooves, very a small compared to the gap formed between the joint surfaces and other general surface constituting the bottom surface of the groove and the synthetic resin.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a main part of the first embodiment of the present invention when the present invention is adopted in an electromagnetic valve already described in the prior art. Hereinafter, the same parts as those shown in FIG.
[0015]
That is, in the solenoid valve 1 of the present embodiment, the metal plate 6 described above has an annular groove 25 on the joint surface 6b with the synthetic resin on the second port side (drain port 13 side) of the portion embedded in the main body 5. Is formed. FIG. 2 shows a plane of the metal plate 6 before the insertion in the present embodiment. That is, in the metal plate 6, a plurality of communication holes 26 for communicating the synthetic resin on both sides of the metal plate 6 when the main body 5 is molded are evenly arranged around the communication hole 11 on a concentric circle. . The annular groove 25 is provided so as to connect the communication holes 11 and surround the communication holes 11. Further, the opposite side walls 25a, 25a constituting the annular groove 25 are perpendicular to the joint surface 6b.
[0016]
In the present embodiment having such a configuration, as shown in FIG. 3, even when a gap L is formed between the joint surface 6b of the metal plate 6 and the synthetic resin when the main body 5 is molded, the main body 5 is attached to the valve block 56. When used, the path from the oil to the valve chamber 12 of the main body 5 through the gap L from the output port 14 becomes longer than when the annular groove 25 is not provided. In addition, since the gap L is generated by the force acting in the direction away from each other between the joint surface 6b and the synthetic resin after the body 5 is clamped, the gaps L and the side walls 25a and 25a constituting the annular groove 25 are formed. With respect to the synthetic resin, the side walls 25a, 25a of the annular groove 25 are perpendicular to the joint surface 6b, and therefore are substantially equal to zero.
[0017]
Therefore, it is possible to eliminate the amount of oil leakage between the output port 14 and the drain port 13 when the solenoid valve 1 is in the fully closed state. Unlike the present embodiment, even when the side walls 25a, 25a of the annular groove 25 are not perpendicular to the joint surface 6b, the gap generated between the side walls 25a, 25a and the synthetic resin is the annular groove. It is extremely smaller than the gap L between the bottom surface bonding surface 25 and other general surfaces (bonding surface 6b) and the synthetic resin. Therefore, even in that case, the leakage amount in the fully closed state can be made substantially zero.
[0018]
Here, the annular groove 25 of the metal plate 6 is not limited to that shown in FIG. 2, and may be the one shown in FIG. 4, for example. That is, the annular groove 25 described above may be formed outside the plurality of communication holes 26. Even in this configuration, the same effect as described above can be obtained. Although not shown, the annular groove 25 may be provided inside the plurality of communication holes 26, or a plurality of annular grooves 25 may be provided in multiple.
[0019]
Further, the annular groove 25 of the metal plate 6 may be formed by press molding. FIG. 5 is a diagram showing a state after insertion in that case. Even in such a structure, the same effect as described above can be obtained.
[0021]
Further, in the present embodiment, the three-way electromagnetic valve 1 has been mainly described. However, in addition to this, for example, a direction having a relief valve and a large number of ports attached to the other party that forms the fluid path. The present invention can also be applied to other pressure control valves such as control valves.
[0022]
【The invention's effect】
As described above, in the present invention, even when a gap is formed between the joint surface of the metal plate and the synthetic resin when the main body is molded, the fluid reaches the inside of the main body from the first port through the gap. The length of the path is long, and the gap formed between the side wall constituting the groove and the synthetic resin is extremely small.
[0023]
Therefore, the amount of fluid leakage between the first port and the second port when the communication hole of the metal plate is fully closed, that is, between the ports provided across the metal plate exposed to the outer peripheral portion of the main body It becomes possible to eliminate or eliminate the amount of fluid leakage.
[0024]
Further, in the configuration in which the main body has an input port, the first port is an output port, and the second port is a drain port, that is, in a three-way type pressure control valve, fluid leaks from the output port to the drain port. It becomes possible to remove or eliminate the amount.
[0025]
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a solenoid valve showing an embodiment of the present invention.
FIG. 2 is a plan view of a metal plate in the same embodiment.
FIG. 3 is a view showing a gap between a metal plate and a synthetic resin in the same embodiment.
FIG. 4 is a plan view showing another metal plate.
FIG. 5 is a cross-sectional view corresponding to FIG. 1 showing another metal plate.
FIG. 6 is a cross-sectional view showing a conventional technique.
FIG. 7 is an explanatory view showing a method for forming a first mounting groove.
FIG. 8 is a cross-sectional view showing a problem of the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Nozzle part 5 Main body 6 Metal plate 6b Joining surface 7 Inflow port 8 Intermediate chamber 11 Communication hole 12 Valve chamber 13 Drain port 14 Output port 25 Annular groove 25a Side wall

Claims (2)

A pressure control valve attached to a mating side forming a fluid path, wherein a metal plate having an exposed portion exposed on an outer peripheral surface of the main body is inserted into a synthetic resin main body, and the metal plate has an inner portion of the main body The first and second ports communicated via the communication hole are provided on the outer peripheral surface of the main body with the exposed portion being spaced apart from each other. In the state attached to the other side, the oil tightness between the region where the first port is provided and the metal plate is exposed and the region where the second port is provided on the outer peripheral surface of the main body is In the pressure control valve to be secured,
A pressure control valve, wherein a groove surrounding the communication hole is provided on a joint surface with a synthetic resin on a side where the second port is located in a portion embedded in the main body of the metal plate. The pressure control valve according to claim 2, wherein the main body has an input port, the first port is an output port, and the second port is a drain port.

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