JP4250837B2 - solenoid valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic valve that opens and closes a fluid passage by driving a valve body by electromagnetic force.
[0002]
[Prior art]
As a prior art, there is an electromagnetic valve disclosed in Japanese Patent Laid-Open No. 9-170675. In this solenoid valve, when the coil is energized and the movable iron core is attracted to the fixed iron core, the valve body supported by the support member together with the movable iron core is separated from the valve seat, opens the fluid passage, and contacts the stopper to open. Valve position is regulated. Here, since the stopper is positioned on the fixed iron core, the valve opening position of the valve body is always constant with respect to the fixed iron core. Further, the position of the movable iron core when the movable iron core is sucked with respect to the fixed iron core is constant because the position of the movable iron core when sucked toward the fixed iron core is determined by the valve body coming into contact with the stopper. By the way, the bobbin is provided with a hole that is open at both ends, and a fixed iron core is accommodated on the counter valve seat side of this hole. On the other hand, a movable iron core is accommodated on the valve seat side of the hole with a predetermined gap between the movable iron core and the hole, and a support member is held in the valve seat side opening of the bobbin. Is provided.
[0003]
On the other hand, the position when the energization of the coil is stopped and the movable iron core is separated from the fixed iron core is determined by the position where the valve body comes into contact with the valve seat, and the valve body is supported by the urging member via the support member. Since it is biased to the side, the variation in dimensions between the valve body (support member) and the stopper or the fixed iron core is absorbed by the biasing member. Thereby, since the space | interval (air gap) of the fixed iron core and movable iron core which oppose to an axial direction can always be kept constant, the dimension between both when a movable iron core is attracted | sucked to the fixed iron core side can be set large. . As a result, the impact force when the valve element hits the stopper is reduced, so that the impact sound can be reduced.
[0004]
[Problems to be solved by the invention]
By the way, since the individual parts constituting the solenoid valve are manufactured by molding or cutting, the dimensional accuracy of the individual parts is ensured, but the positional relationship between the bobbin and the cover when the bobbin and the cover are fixed with a yoke. Cause variation. That is, the seat surface of the valve seat formed integrally with the cover is orthogonal to the axis of the bobbin, but the seat surface of the valve seat is slightly inclined with respect to the normal position when the caulking is fixed. was there. On the other hand, the movable iron core is fitted into a cylindrical hole, which is a movable iron core accommodating portion provided on the bobbin, with a gap substantially concentrically. Due to this substantially concentric gap, the movable iron core can be slightly inclined in any direction within the bobbin. Here, as described above, even if the seat surface of the valve seat is slightly inclined with respect to the normal position when the caulking is fixed, the integral valve body is inclined in conjunction with the movable iron core and the support member, and the valve Since it can be in close contact with the seat, the sealing performance of the valve is maintained. However, when the movable iron core is assembled eccentrically with respect to the bobbin and the movable iron core is in contact with the bobbin, the movable iron core can hardly be tilted, and the integral valve body is tilted via the movable iron core and the support member. There was a possibility that the seal could not be completely adhered to the seat and the sealing performance was poor.
[0005]
The present invention has been made based on the above circumstances, and its purpose is to accurately regulate the positional relationship between the movable iron core and the bobbin, thereby preventing electromagnetic leakage due to poor contact between the valve seat and the valve body. Is to provide a valve.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following technical means.
[0007]
According to the first aspect of the present invention, there is provided an elastic member for fixing the peripheral portion of the support member so as to be radially displaceable, and the outer peripheral portion of the elastic member and the inner wall of the bobbin facing the elastic member. At least one of them is provided with a restricting means to restrict the displacement of the support member in the radial direction. Thus, when the support member is inserted into the bobbin, the displacement of the support member relative to the bobbin is restricted by the restricting means, so that the positional relationship between the movable iron core fixed to the support member and the bobbin is also restricted. Therefore, a predetermined gap is created between the movable iron core and the bobbin, so the movable iron core can be tilted in the bobbin, and the valve body can follow even in the case of an inclined valve seat, and the adhesion and sealing performance of both can be maintained. It becomes.
[0008]
According to the first aspect of the present invention, the maximum value of the radial displacement of the support member is restricted by the restriction means so as to be smaller than the gap between the bobbin and the movable iron core. Thus, when the support member is inserted into the bobbin, the displacement of the support member relative to the bobbin is restricted by the restricting means, and there is always a gap of a certain value or more between the movable iron core fixed to the support member and the bobbin. Exists.
[0009]
According to the second aspect of the present invention, as the restricting means, a plurality of convex portions are provided on each of the inner wall of the bobbin and the outer peripheral portion of the elastic member, and these convex portions are opposed to each other. In this case, when the support member is inserted into the bobbin, the displacement of the support member with respect to the bobbin is restricted by the convex portions that are restricting means facing each other. Relationships are also regulated.
[0010]
According to the third aspect of the present invention, each of the plurality of convex portions provided on the outer peripheral portion of the elastic member is opposed to at least one of the plurality of convex portions provided on the inner wall of the bobbin. Yes. In this case, when the support member is inserted into the bobbin, the convex portions reliably face each other, so that the displacement of the support member with respect to the bobbin is reliably regulated. As a result, the positional relationship between the movable iron core fixed to the support member and the bobbin is also reliably regulated.
[0011]
According to the means of claim 4 of the present invention, the plurality of convex portions provided on the outer peripheral portion of the elastic member are protrusions that extend concentrically with the support member, which is a partial extension of the support member in the radial direction. It is. In this case, when the support member is inserted into the bobbin, the plurality of protrusions have a predetermined length in the circumferential direction, and thus reliably face the plurality of protrusions provided on the inner wall of the bobbin. The displacement with respect to is regulated. As a result, the positional relationship between the movable iron core fixed to the support member and loosely disposed in the bobbin and the bobbin is also restricted.
[0012]
According to the means of claim 5 of the present invention, a positioning portion for positioning both is provided between the inner wall of the bobbin and the support member. In this case, since the positional relationship between the support member and the bobbin uniquely determined, the convex portion provided on the outer periphery of the convex portion (restricting means) and an elastic member provided on the bobbin (restricting means) is always opposite, whereby the support The displacement of the member with respect to the bobbin is reliably regulated. As a result, since the positional relationship between the movable iron core fixed to the support member and the bobbin is also reliably restricted, the number of convex portions provided on the outer peripheral portion of the bobbin and the elastic member can be minimized in terms of function. .
[0013]
According to the means of claim 6 of the present invention, the elastic member is formed in a ring shape, and the plurality of convex portions provided on the outer peripheral portion of the elastic member are protrusions that expand concentrically with the elastic member. . In this case, when the support member is inserted into the bobbin, the plurality of protrusions have a predetermined length in the circumferential direction, and thus reliably face the plurality of protrusions provided on the inner wall of the bobbin. The displacement with respect to is regulated. As a result, the positional relationship between the movable iron core fixed to the support member and loosely disposed in the bobbin and the bobbin is also restricted.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a solenoid valve according to the present invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals.
[0015]
(First embodiment)
FIG. 1 is an overall cross-sectional view of a solenoid valve according to a first embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part around a valve body. The electromagnetic valve 1 includes a cover 2 having a fluid passage (described later), a bobbin 3 combined with the cover 2, a coil 4 wound around the bobbin 3, and a fixed iron core 5 magnetized by the magnetic force generated by the coil 4. When the coil 4 is energized, the movable iron core 7 that is attracted to the fixed iron core 5 side, the valve body 8 that is integrally displaced with the movable iron core 7 to open and close the fluid passage, and the movable iron core 7 and the valve body 8 can be displaced. It is comprised from the leaf | plate spring 9 (support member of this invention) etc. to support.
[0016]
The cover 2 is provided with an inflow passage 10 and an outflow passage 11 that form a fluid passage, and a valve seat 12 on which the valve body 8 is seated. The valve seat 12 is provided so as to protrude in a cylindrical shape from the downstream end of the inflow passage 10 toward the valve body 8, and the inflow passage 10 is closed by the seating surface 8 a of the valve body 8 seated on the valve seat 12. The passage 10 and the outflow passage 11 are blocked, and the inflow passage 10 is opened by the separation of the seating surface 8a of the valve body 8 from the valve seat 12, so that the inflow passage 10 and the outflow passage 11 are communicated. There is also an example in which the inflow passage 10 and the outflow passage 11 are reversed.
[0017]
The bobbin 3 is insert-molded with a magnetic plate 13 during resin molding. After the coil 4 is wound around the outer periphery of the bobbin 3, a terminal is connected to the terminal 14, and a magnetic force is generated by energizing from the outside through the terminal 14. The terminal 14 is insert-molded in a connector 16 that is integrally molded with a housing portion 15 that covers the outer periphery of the coil 4. Further, the end of the bobbin 3 on the side to be combined with the cover 2 (the right side in FIG. 1) has an engaging portion 3a that engages with the cover 2 and a leaf spring 9 (a supporting member of the present invention, a movable iron core). 7 and a valve body 8 are displaceably supported), and a cylindrical housing 3d is formed for loosely holding the movable iron core 7. Further, as shown in FIGS. 3 and 4, a plurality of convex portions 3 c (regulating means of the present invention) having a length in the axial direction of the bobbin 3 are provided on the engaging portion 3 a. One end of the convex portion is in contact with the holding portion 3b, and the other end is set to have a predetermined gap between the end and the cover when the bobbin 3 and the cover 2 are assembled. Has been.
[0018]
The fixed iron core 5 is inserted into the inner periphery of the bobbin 3, and one end protruding from the end surface (the left end surface in FIG. 1) of the bobbin 3 is fixed to the yoke 17 by caulking, press-fitting, welding, or the like. Has been. A piece 6 (stopper) is press-fitted and fixed to the other end of the fixed iron core 5. The yoke 17 is attached to the magnetic plate 13 that covers the outer periphery of the housing portion 15 and protrudes from the bobbin 3, and then fixed to the cover 2 that is combined with the bobbin 3 by caulking the tip.
[0019]
The movable iron core 7 is loosely fitted to the accommodation portion 3d of the bobbin 3 on the magnetic plate 13 side (right side in FIG. 1) so as to face the fixed iron core 5, and is formed in a substantially cylindrical shape. The movable iron core 7 is provided with an opposing wall portion 70 that is bent radially inward at one end portion to form an air gap G (see FIG. 2) between the end surface 5a of the fixed iron core 5 and the other end portion. A flange portion 71 that expands radially outward is provided at the end, and this flange portion 71 is fixed to the leaf spring 9 by welding on the outside of the bobbin 3.
[0020]
As shown in FIG. 5, the leaf spring 9 includes a substantially circular support surface 90 that supports the movable iron core 7 and the valve body 8, and a plurality of (for example, three) support arms 91 provided on the outer periphery of the support surface 90. , And an annular portion 92 that connects the end portions of the support arms 91, and a rubber ring portion 19 (the elastic member of the present invention) fixed to the annular portion 92 is provided on the end surface of the bobbin 3. It is clamped between 3b and the end surface of the cover 2 (refer FIG. 2). Further, the ring portion 19 ensures and maintains airtightness between the outflow passage and the outside of the solenoid valve. The leaf spring 9 can be bent to the left and right sides in FIG. 2 as the movable iron core 7 is displaced. As shown in FIGS. 5 and 6, a plurality of protrusions extending concentrically with the leaf spring 9 (supporting member of the present invention) are provided on the outer peripheral portion of the ring portion 19 by extending the leaf spring 9 in the radial direction. 9a (regulating means of the present invention) is provided. The lengths and intervals of the arcs of these protrusions 9 a are set so that each protrusion 9 a faces at least one of the convex portions 3 c provided on the bobbin 3. Here, the amount of radial displacement of the leaf spring 9 on the holding portion 3b of the bobbin 3 is regulated by the plurality of protrusions 9a provided on the leaf spring 9 and the plurality of convex portions 3c provided on the bobbin 3. . Further, the shapes of the protrusions 9 a and the protrusions 3 c are set so that the maximum radial displacement of the leaf spring 9 is smaller than the gap between the housing portion 3 d of the bobbin 3 and the fixed iron core 7.
[0021]
The valve body 8 is made of an elastic body (for example, rubber), and fixed to a position facing the piece 6 on the inner peripheral side of the flange portion 71 of the movable iron core 7 with respect to the leaf spring 9, as shown in FIG. It is urged toward the valve seat 12 by a spring 18 (biasing member) disposed between the flange portion 62 of the piece 6 and the leaf spring 9. When the coil 4 is energized and the movable iron core 7 is attracted toward the fixed iron core 5, the valve element 8 is bent by the leaf spring 9 against the urging force of the spring 18, thereby the piece 6 of the valve element 8. The side end face 8b contacts the end face 6a (hereinafter referred to as the stopper face 6a) of the piece 6, and when the coil 4 is not energized, the seating face 8a of the valve body 8 is seated on the valve seat 12 by the biasing force of the spring 18. ing.
[0022]
Next, the operation of the embodiment of the present invention will be described. First, when the coil 4 is not energized, the seating surface 8a of the valve body 8 is seated on the valve seat 12 by the biasing force of the spring 18, as shown in FIG. Is blocked, and no fluid flows in the fluid passage. Thereafter, when the coil 4 is energized and the fixed iron core 5 is magnetized by the magnetic force generated by the coil 4, the movable iron core 7 is attracted toward the fixed iron core 5 against the urging force of the spring 18. As a result, the leaf spring 9 bends as the movable iron core 7 moves, so that the valve body 8 fixed to the leaf spring 9 moves away from the valve seat 12 and opens the inflow passage 10. The 6-side end face 8b is lifted to a position where it abuts against the stopper face 6a of the piece 6. As a result, the inflow passage 10 and the outflow passage 11 communicate with each other, whereby a fluid flow is generated from the inflow port 10a of the inflow passage 10 toward the outflow port 11b of the outflow passage 11.
[0023]
On the other hand, when the energization to the coil 4 is stopped, the magnetic force of the coil 4 disappears and the force for attracting the movable iron core 7 is lost. It is pushed back by the biasing force. As the movable iron core 7 moves, the valve body 8 moves toward the valve seat 12 and is seated on the valve seat 12 to close the fluid passage.
[0024]
According to the configuration of the present embodiment described above, the protrusion 9a is such that the maximum radial displacement of the leaf spring 9 with respect to the bobbin 3 during assembly is smaller than the gap between the housing portion 3d of the bobbin 3 and the movable iron core 7. And the shape of the convex part 3c is set. Therefore, when the leaf spring 9 (the valve body 8 and the movable iron core 7 are already fixed) is set on the holding portion 3b of the bobbin 3, a predetermined amount is automatically provided between the movable iron core 7 and the housing portion 3d of the bobbin 3. The gap is secured. Due to this gap, the movable iron core 7 can be slightly inclined in an arbitrary direction within the bobbin 3. When the cover 2 and the bobbin 3 are caulked and fixed by the yoke 17, even if the valve seat 12 is slightly inclined without being parallel to the seating surface 8 a of the valve body 8, the integral valve is interposed via the movable iron core 7 and the leaf spring 9. Since the body 8 is tilted in conjunction with it and can contact the valve seat 12, the airtightness between the valve seat 12 and the valve body 8 can be maintained.
[0025]
FIG. 7 shows a first modification of the first embodiment. In the present embodiment, one end of the plurality of convex portions 3c (the regulating means of the present invention) provided on the bobbin 3 is in contact with the holding portion 3b, and the other end is the cover 2 assembled to the bobbin 3. Although sometimes set to have a predetermined gap between the end and the cover, in this modification, as shown in FIG. 7, the end of the convex portion 3c on the opening side of the bobbin 3 is extended, A tapered portion 3f is provided at this end portion, and a cutout portion 2a is provided on the cover 2 to avoid interference with the convex portion 3c. In this case, when the leaf spring 9 is set on the bobbin 3 in the assembling step, the tapered portion 3f of the convex portion 3c serves as a guide for the protrusion 9a, so that the leaf spring 9 can be easily set and workability can be improved. Further, since the cover 2 is provided with a notch 2a for preventing interference with the convex portion 3c, when the cover 2 is assembled to the bobbin 3, the cover 2 rides on the convex portion 3c and is normally assembled. It is possible to prevent the problem of not being present.
[0026]
8 and 9 show a second modification of the first embodiment. In the present embodiment, the rubber ring portion 20 (the elastic member of the present invention) is fixed to the annular portion 92 of the outer peripheral portion of the leaf spring 9, and the ring portion 20 is integrally formed with the outer peripheral portion of the ring portion 20, A plurality of protrusions 20a (regulating means of the present invention) extending concentrically with the leaf spring 9 are provided. The lengths and intervals of the arcs of these protrusions 20 a are set so that each protrusion 20 a faces at least one of the convex portions 3 c provided on the bobbin 3. Further, the shapes of the protrusions 20a and the protrusions 3c are set so that the maximum amount of radial displacement of the leaf spring 9 relative to the bobbin 3 during assembly is smaller than the gap between the housing part 3d of the bobbin 3 and the movable iron core 7. Yes. Accordingly, as in the case of the first embodiment described above, a predetermined gap is secured between the movable iron core 7 and the housing portion 3d of the bobbin 3. Due to this gap, the movable iron core 7 can be slightly inclined in an arbitrary direction within the bobbin 3. When the cover 2 and the bobbin 3 are caulked and fixed by the yoke 17, even if the valve seat 12 is slightly inclined without being parallel to the seating surface 8 a of the valve body 8, Since the body 8 is tilted in conjunction with it and can contact the valve seat 12, the airtightness between the valve seat 12 and the valve body 8 can be maintained.
[0027]
In the embodiment described above, the restricting means for restricting the position of the leaf spring 9 (support member) relative to the bobbin 3 is provided on both the bobbin 3 and the leaf spring 9, but it may be provided only on one of them. The same effect as this embodiment can be obtained.
[0028]
(Second Embodiment)
10, 11 and 12 show a second embodiment of the present invention. In the second embodiment of the present invention, a positioning portion for restricting the leaf spring 9 from rotating about the axis of the bobbin 3 is provided in the leaf spring 9 and the bobbin 3 with respect to the first embodiment. Is. As shown in FIG. 10, a concave portion 3e (positioning portion) is provided in the engaging portion 3a that engages with the cover 2 of the bobbin 3, and the leaf spring 9 is provided on the outer peripheral portion of the leaf spring 9 as shown in FIGS. Is partially extended in the radial direction to provide a protrusion 9b (positioning portion). The protrusion 9 b of the leaf spring 9 is engaged with the recess 3 e of the bobbin 3. With this configuration, when the leaf spring 9 is set on the bobbin 3, the leaf spring 9 is restricted from rotating about the axis of the bobbin 3, and a plurality of protrusions 9 a provided on the leaf spring 9 are provided on the bobbin 3. It reliably faces the plurality of convex portions 3c. Thereby, in the assembly process of the electromagnetic valve, when the leaf spring 9 (the valve body 8 and the movable iron core 7 are already fixed) is set in the holding portion 3b of the bobbin 3, the radial displacement of the leaf spring 9 is Since it is regulated to be smaller than the gap between the housing part 3d of the bobbin 3 and the fixed iron core 7, a predetermined gap is secured between the movable iron core 7 and the housing part 3d of the bobbin 3. Due to this gap, the movable iron core 7 can be slightly inclined in an arbitrary direction within the bobbin 3. When the cover 2 and the bobbin 3 are caulked and fixed by the yoke 17, even if the valve seat 12 is not parallel to the seating surface 8 a of the valve body 8 and is slightly inclined, the integral valve body via the movable iron core 7 and the leaf spring 9 is used. 8 is tilted in conjunction with it and can be in close contact with the valve seat 12, so that airtightness between the valve seat 12 and the valve body 8 can be maintained. In addition, since the plurality of protrusions 9a provided on the leaf spring 9 are surely opposed to the plurality of protrusions 3c provided on the bobbin 3, the number of protrusions 3c can be the same as the number of protrusions 9a. . Further, when the leaf spring 9 is set on the bobbin 3, the protrusion 9 b of the leaf spring 9 engages with the recess 3 e of the bobbin 3, so that the leaf spring 9 hardly rotates with respect to the bobbin. The size of the plurality of projections 9a, that is, the length of the arc can be minimized.
[0029]
In the second embodiment, the protrusion 9b (positioning portion) of the leaf spring 9 is provided by partially extending the outer peripheral portion of the leaf spring 9 in the radial direction. It may be provided by being integrally formed with the ring portion 19.
[Brief description of the drawings]
FIG. 1 is an overall cross-sectional view of a solenoid valve showing a first embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part around a leaf spring (when the valve is closed).
FIG. 3 is a front view of an end portion of a bobbin on a side of a leaf spring holding portion.
4 is a cross-sectional view taken along the line IV-IV in FIG. 3;
FIG. 5 is a plan view of a leaf spring.
6 is a cross-sectional view taken along line VI-VI in FIG.
FIG. 7 is a cross-sectional view of a first modification of the first embodiment.
FIG. 8 is a plan view of a leaf spring of a second modified example of the first embodiment.
9 is a cross-sectional view taken along line IX-IX in FIG.
FIG. 10 is a front view of an end portion on the side of a leaf spring holding portion of a bobbin according to a second embodiment of the present invention.
FIG. 11 is a plan view of a leaf spring according to a second embodiment of the present invention.
12 is a cross-sectional view taken along line XII-XII in FIG.
[Explanation of symbols]
1 Solenoid valve 2 Cover 3 Bobbin 3c Convex part (regulating means)
3e recess (positioning part)
4 Coil 5 Fixed iron core 7 Movable iron core 8 Valve element 9 Leaf spring (support member)
9a Protrusion (regulating means, convex part)
9b Protrusion (positioning part)
10 Inflow passage 11 Outflow passage 12 Valve seat 18 Spring (biasing member)
19 Ring part (elastic member)
20 Ring part (elastic member)
20a Protrusion (regulating means, convex part)

Claims (6)

A cover provided with a valve seat on the inner wall forming the fluid passage, a bobbin having one end engaged with the cover and having a fixed iron core wound around the outer periphery and magnetized by the electromagnetic coil; A valve body interposed between the fixed iron core and the valve seat, closing the fluid passage by being seated on the valve seat, and opening the fluid passage by being separated from the valve seat; and the valve body A flexible support member that supports the valve seat so that it can be opened and closed, a biasing member that biases the support member in a direction of seating on the valve seat, and a loose fit in the bobbin. And a movable iron core that is linked to the valve body and that moves away from the urging force of the urging member when the electromagnetic coil is energized and is attracted toward the fixed iron core. An elastic member for fixing the peripheral portion of the support member to be displaceable in the radial direction; Only the outer peripheral portion and at least restricting means any one of an inner wall of the bobbin to the elastic member and the facing of the elastic member is provided, and configured to regulate the displacement in the radial direction of the support member, by the regulating means An electromagnetic valve characterized in that a maximum value of radial displacement of the support member is restricted to be smaller than a gap between the bobbin and the movable iron core . 2. The solenoid valve according to claim 1, wherein a plurality of convex portions are provided on each of the inner wall of the bobbin and the outer peripheral portion of the elastic member as the regulating means, and the convex portions are opposed to each other . Wherein the plurality of protrusions provided on an outer peripheral portion of the elastic member, the 請 Motomeko 2 you, characterized in that each of which at least one facing of the plurality of protrusions provided on an inner wall of the bobbin The solenoid valve described. Wherein the plurality of projections provided on the outer peripheral portion of the elastic member, the supporting member partially extending in a radial direction, and the supporting member and characterized in that it is a concentrically widened protrusion claim 2, wherein Item 4. The solenoid valve according to Item 3. The electromagnetic valve according to any one of claims 2 to 4, wherein a positioning portion is provided between the inner wall of the bobbin and the support member . The said elastic member is comprised by the ring shape, and these convex parts provided in the outer peripheral part of the said elastic member are protrusions extended concentrically with the said elastic member, The Claim 2 or Claim 3 characterized by the above-mentioned. The solenoid valve described in 1.

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