JP2004011741A - Solenoid valve unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid valve unit capable of softening shocks while a valve member is collided with a control unit and preventing the valve member from sticking to the control unit. <P>SOLUTION: The solenoid valve unit comprises the valve member 50 opening and closing fluid passages 72 and 73 by reciprocating, a fixing core 11, a moving core 40 integrally movable together with the valve member 50, coil portions 20 and 21 attracting the moving core 40 to the fixing core 11 by turning on electricity, and the control unit 36 controlling movements of the valve member 50 to the fluid passage at an open side by bringing into contact with the valve member 50. A projection 56 of the valve member 50 is made of rubber, and sticks out of an opposite end face 54a facing the control unit 36. A base end of the projection 56 is formed in a looped shape at a boundary D with the opposite end face 54a, and a projected end face 56a of the projection 56 brought into contact with the control unit 36 provides a shape gradually separating from a top T to the boundary D side. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electromagnetic valve device that opens and closes a fluid passage.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known an electromagnetic valve device that opens and closes a fluid passage by a valve member that moves integrally with a movable core by sucking and separating a movable core with respect to a fixed core in accordance with an energized state of a coil unit. .
The electromagnetic valve device disclosed in Japanese Patent Application Laid-Open No. 9-170675 is provided with a regulating portion that regulates the movement of the valve member toward the fluid passage opening side by contacting the valve member. In this device, a rubber protrusion is provided on the end surface of the valve member facing the regulating portion, and the impact is mitigated by colliding the valve member with the regulating portion at the distal end surface of the projection.
[0003]
[Problems to be solved by the invention]
In the device disclosed in the above publication, the projection on the end face of the valve member is formed in a closed loop shape, so that the tip face of the projection abutting on the restricting portion is concave inside. Therefore, when the protrusion is pressed against the restricting portion by the movement of the valve member, the pressure in the closed space surrounded by the concave portion of the protrusion tip surface and the restricting portion is reduced, and the protrusion functions as a so-called suction cup and is attracted to the restricting portion. Due to this adsorption, when the valve member is moved to the closing side of the fluid passage, the movement start of the valve member is delayed, and the responsiveness is deteriorated.
SUMMARY OF THE INVENTION It is an object of the present invention to provide an electromagnetic valve device that alleviates an impact when a valve member collides with a regulating portion and prevents the valve member from being attracted to the regulating portion.
[0004]
[Means for Solving the Problems]
According to the solenoid valve device of the first aspect of the present invention, the valve member has at least one projection protruding from the facing end face facing the regulating portion. The protrusion is formed of rubber, and abuts on the regulating portion at the protruding end surface. Thereby, the impact when the valve member moving to the opening side of the fluid passage collides with the regulating portion can be reduced by the projection. In addition, the base end of the projection forms a loop with the opposing end surface in a single loop, and the protruding end surface of the projection has a shape that is separated from the regulating portion as it goes from the top to the boundary side with the opposing end surface. That is, the projection is not formed in a closed loop, and the top of the projection is not concave. Therefore, even if the protrusion is pressed by the restricting portion due to the movement of the valve member, the protrusion can be prevented from adsorbing to the restricting portion, so that the responsiveness when moving the valve member to the closed side of the fluid passage can be improved. it can.
[0005]
According to the solenoid valve device of the second aspect of the present invention, a plurality of projections are arranged at equal intervals around the central axis of the opposed end face of the valve member facing the regulating portion. Thereby, the impact when the valve member collides with the regulating portion can be evenly absorbed by the plurality of projections. Therefore, the buffer characteristics can be improved while ensuring the durability of the projection.
[0006]
According to the electromagnetic valve device according to the third and fourth aspects of the present invention, the protrusion is formed of rubber having a deflection amount of 0.23 mm or more upon collision with the restricting portion. Thereby, the impact can be reliably absorbed by the bending deformation of the projection.
According to the solenoid valve device of the fifth aspect of the present invention, since the projection is formed by integral rubber molding with the valve member, the number of parts can be reduced and cost can be reduced.
[0007]
According to the electromagnetic valve device of the sixth aspect of the present invention, the valve member is supported by the elastic support member so as to be capable of reciprocating movement for opening and closing the fluid passage. With this support member, the impact when the valve member collides with the regulating portion can be reduced.
According to the electromagnetic valve device of the present invention, the support member is formed of a plate-like elastic material and has a cutout hole penetrating in the plate thickness direction. As a result, the rigidity of the support member is reduced and the support member is easily elastically deformed, so that the buffer effect of the support member can be enhanced.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example showing an embodiment of the present invention will be described with reference to the drawings.
1 to 3 show an electromagnetic valve device according to one embodiment of the present invention. The electromagnetic valve device 10 of the present embodiment is a valve device used for a system that sends out evaporated fuel generated in a fuel tank of an automobile to an engine, for example, and opens and closes a flow path of the evaporated fuel.
[0009]
The resin-made passage member 70 forms a valve seat portion 71 and an inflow passage 72 and an outflow passage 73 as fluid passages. The valve seat portion 71 is provided between the downstream end of the inflow passage 72 and the upstream end of the outflow passage 73 so that a valve member 50 described later can be seated thereon. When the valve member 50 is seated on the valve seat 71, communication between the downstream end of the inflow passage 72 and the upstream end of the outflow passage 73 is interrupted, and the fluid passage is closed. When the valve member 50 is separated from the valve seat 71, the downstream end of the inflow passage 72 communicates with the upstream end of the outflow passage 73, and the fluid passage is opened.
[0010]
The fixed core 11, the yoke 12, and the core plate 13 are formed of a magnetic material. The fixed core 11 has a cylindrical shape, and a yoke 12 is fixed to one end 11a by caulking or the like. The core plate 13 is connected to the yoke 12 on the other end 11 b side of the fixed core 11. The core plate 13 is provided with a through hole 14 penetrating in the thickness direction. The bobbin 20 around which the coil 21 is wound is arranged on the outer peripheral side of the fixed core 11 so as to be sandwiched between the yoke 12 and the core plate 13. The bobbin 20 and the coil 21 constitute a coil unit.
[0011]
The resin base member 30 is formed by insert molding of the fixed core 11, the yoke 12, the core plate 13, the bobbin 20, and the coil 21. The base member 30 is joined to the passage member 70. The base member 30 is provided with a connector section 31 and a regulating section 36. A terminal 32 is embedded in the connector section 31 and is electrically connected to the coil 21. In the present embodiment, a control device (not shown) electrically connected to the terminal 32 supplies a current to the coil 21 for a time corresponding to the control command value. The restricting portion 36 is formed in a substantially cylindrical shape so as to fill the inside of the fixed core 11. The restricting portion 36 protrudes from the end 11 b side of the fixed core 11 toward the valve member 50, and is inserted into the through hole 14 of the core plate 13. The protruding end surface 36 a of the restricting portion 36 is formed as a flat surface perpendicular to the central axis Q of the fixed core 11. A cylindrical guide member 33 is fixed to the outer peripheral side of the protruding end of the regulating portion 36. The guide member 33 may be formed separately from the restricting portion 36 as in this embodiment, or may be formed integrally with the restricting portion 36.
[0012]
The movable core 40 is formed of a magnetic material into a cylindrical shape. The movable core 40 is disposed coaxially with the fixed core 11 on the inner peripheral side of the through hole 14 of the core plate 13. The one end 40a side of the movable core 40 facing the end 11b of the fixed core 11 is slidably guided by the inner peripheral wall with the outer peripheral wall of the guide member 33. Thereby, the movable core 40 can reciprocate on both sides in the direction of the central axis R. On the inner peripheral side of the movable core 40, a coil spring 41 as an urging means is accommodated.
[0013]
The support member 60 is formed of a plate-shaped elastic leaf spring. The outer peripheral portion of the support member 60 is sandwiched between the base member 30 and the passage member 70 via a rubber ring member 61. As a result, the support member 60 expands between the other end portion 40b of the movable core 40 and the valve seat portion 71, and the one surface 60a is connected to the end surface 36a of the regulating portion 36 and the surface 13a of the core plate 13 on the side opposite to the fixed core. They are facing each other. The other end 40b of the movable core 40 is fixed to the surface 60a side of the support member 60 by welding or the like. A coil spring 41 is interposed between the surface 60a of the support member 60 and the end surface of the guide member 33 opposite to the fixed core. The coil spring 41 urges the support member 60 toward the valve seat 71 side.
[0014]
At the center of the support member 60, a notch hole 62 penetrating in the thickness direction is provided. The notch holes 62 of the present embodiment have a shape extending radially from the center of the support member 60 toward three places at equal intervals in the circumferential direction. The valve member 50 is fitted and fixed to the center of the notch hole 62. Thereby, the valve member 50 is supported by the support member 60 so as to be able to reciprocate integrally with the movable core 40.
[0015]
The valve member 50 is formed of rubber. The valve member 50 has a seat portion 52 and a contact portion 54. The seat portion 52 is formed in a disk shape protruding from the surface 60b of the support member 60 opposite to the surface 60a to the valve seat portion 71 side. The seat portion 52 can be seated on the valve seat portion 71 with its protruding end surface 52a. The contact portion 54 is formed in a disk shape protruding from the surface 60 a of the support member 60 toward the regulation portion 36. The contact portion 54 is accommodated coaxially in the movable core 40, and a projecting side end surface 54 a formed of a flat surface perpendicular to the central axis O is opposed to the end surface 36 a of the regulating portion 36. Hereinafter, the end surface 54a of the contact portion 54 is referred to as an opposing end surface 54a. The contact portion 54 has a plurality (three in this embodiment) of projections 56 protruding from the facing end surface 54a. The plurality of projections 56 are arranged at equal intervals around the central axis O of the opposed end face 54a so as to correspond to the radial portions of the cutout holes 62. The base end of each projection 56 forms a boundary D with the opposing end surface 54a in one loop. In this embodiment, the protruding end surface 56a of each projection 56 is formed in a substantially hemispherical shape that is separated from the restricting portion 36 from the top T located on the central axis toward the boundary D. That is, the protruding end surface 56a has a shape in which an outline in an arbitrary vertical cross section smoothly curves from the top T toward the boundary D side. The protruding end surface 56 a of each projection 56 can abut on the end surface 36 a of the restricting portion 36.
[0016]
As the rubber forming the valve member 50, a known rubber such as, for example, fluorine rubber can be used. However, as shown by a white arrow in FIG. It is preferable to use a rubber having a size of 23 mm or more. When the amount of deflection of the protrusion 56 is 0.23 mm or more, as shown in FIG. 4, the amount of bounce of the valve member 50 at the time of collision with the restricting portion 36 becomes small, and the outflow rate with respect to the duty ratio as a control command value (See FIG. 7 (A)) occurring in the linearity of (1) decreases to 0.4 L / min or less. As shown in FIG. 5, it is preferable to use rubber having a hardness of about 70 Hs or less in a temperature range of −20 ° C. to 120 ° C. as the rubber forming the valve member 50. By using a rubber having such a hardness, a desired cushioning characteristic can be obtained by the projection 56 even when the temperature of the outer periphery of the device falls to zero. In the present embodiment, the valve member 50 is formed of fluororubber that satisfies both the requirements regarding the amount of deflection and hardness of the projection 56.
[0017]
Next, the operation of the solenoid valve device 10 will be described.
(1) When the coil 21 is not energized, the movable core 40 is separated from the fixed core 11 in a state where the support member 60 is slightly bent toward the valve seat 71 by the urging force of the coil spring 41. At this time, the valve member 50 separates from the regulating portion 36 and separates from the valve seat portion 71. Thereby, the communication between the inflow passage 72 and the outflow passage 73 is blocked and the fluid passage is closed, so that the fluid supplied to the upstream end of the inflow passage 72 does not flow out from the downstream end of the outflow passage 73.
[0018]
(2) When the coil 21 is energized, the coil 21 generates a magnetic force that attracts the movable core 40 to the fixed core 11 side. Then, the movable core 40 approaches the fixed core 11 while bending the support member 60 toward the regulating portion 36 against the urging force of the coil spring 41. The valve member 50 moves toward the regulating portion 36 along with the bending of the support member 60, and the seat portion 52 separates from the valve seat portion 71. As a result, the inflow passage 72 and the outflow passage 73 communicate with each other, and the fluid passage is opened, so that the fluid supplied to the upstream end of the inflow passage 72 flows out of the downstream end of the outflow passage 73.
[0019]
The movement of the movable core 40 and the valve member 50 due to the energization of the coil 21 is regulated by the contact portion 54 of the valve member 50 abutting on the regulating portion 36 during a full lift. In the electromagnetic valve device 10, the valve member 50 collides with the restricting portion 36 at a protrusion 56 formed of rubber on the contact portion 54. In addition, the support member 60 that supports the valve member 50 in the electromagnetic valve device 10 is configured by a notch hole 62 in addition to being formed of an elastic leaf spring, and is easily elastically deformed in the plate thickness direction, that is, the reciprocating direction of the valve member 50. It has become. With the protrusion 56 and the support member 60, the impact when the valve member 50 collides with the regulating portion 36 is sufficiently reduced. Therefore, in the electromagnetic valve device 10, the bounce of the valve member 50 at the time of collision as shown by the arrow X in FIG. 6A is suppressed as compared with the case where the projection 56 is not provided (see FIG. 6B). As a result, as shown in FIG. 7A, the turbulence Δq that occurs in the linearity of the outflow flow rate with respect to the duty ratio is smaller than when the protrusion 56 is not provided (see FIG. 7B).
[0020]
Further, in the solenoid valve device 10, the protrusion 56 having the above-mentioned effect has a shape on the protruding end face 56 a that is away from the regulating portion 36 as going from the top T toward the boundary line D extending in a loop shape. Even when the protruding end surface 56a abuts on the end surface 36a of the regulating portion 36, no closed space is formed between the surfaces 56a, 36a. This prevents the protruding end surface 56a of the projection 56 from adsorbing to the end surface 36a of the restricting portion 36, thereby improving the responsiveness when the valve member 50 closes the fluid passage. In addition, in the electromagnetic valve device 10, the impact when the valve member 50 collides with the regulating portion 36 is evenly distributed by the plurality of protrusions 56 provided at equal intervals around the central axis O of the opposed end surface 54a of the valve member 50. Can be absorbed. Therefore, the durability of the projection 56 is improved.
[0021]
In the embodiment described above, three projections 56 are provided on the facing end surface 54a of the valve member 50. However, as shown in a modified example in FIG. 8, only one projection 56 may be provided, Two or four or more projections 56 may be provided. When a plurality of projections 56 are provided, it is desirable to provide them at equal intervals around the center axis O of the opposed end face 54a as in the above embodiment.
Further, in the above embodiment, the top portion T of the protruding end surface 56b is formed as a point on the central axis of the projection 56, but the top portion of the protruding end surface is formed as a continuous ridge extending at a predetermined length according to the shape of the projection. It may be formed.
[Brief description of the drawings]
1A is a sectional view showing an electromagnetic valve device according to one embodiment of the present invention, and FIG. 1B is an enlarged view of a main part in FIG.
FIG. 2 is a bottom view of the support member and the valve member shown in FIG.
FIG. 3 is a plan view of the valve member shown in FIG. 1;
FIG. 4 is a characteristic diagram for explaining a rubber forming the valve member shown in FIG. 1;
FIG. 5 is another characteristic diagram for explaining a rubber forming the valve member shown in FIG. 1;
FIG. 6 is a characteristic diagram showing a change over time in a moving position of a valve member between an electromagnetic valve device (A) according to an embodiment of the present invention and a device (B) for comparison.
FIG. 7 is a characteristic diagram showing a correlation between an outflow flow rate and a duty ratio in an electromagnetic valve device (A) according to one embodiment of the present invention and a device (B) for comparison.
8 is a plan view (A) and a sectional view (B) showing a modified example of the valve member shown in FIG.
[Explanation of symbols]
10 Solenoid valve device 11 Fixed core 20 Bobbin (coil part)
21 coil (coil part)
Reference Signs List 30 base member 33 guide member 36 regulating portion 40 movable core 41 coil spring 50 valve member 52 seat portion 54 contact portion 54a facing end surface 56 projection 56a projecting end surface 60 support member 62 cutout hole 70 passage member 71 valve seat portion 72 inflow passage (Fluid passage)
73 Outflow passage (fluid passage)
D Boundary line O Central axis T of opposite end face Top

Claims (7)

A valve member that opens and closes the fluid passage by reciprocating;
A fixed core,
A movable core that is provided so as to be integrally movable with the valve member, opens the fluid passage with the valve member when approaching the fixed core, and closes the fluid passage with the valve member when separated from the fixed core. When,
A coil unit that generates a magnetic force to attract the movable core to the fixed core by energization;
A regulating portion that regulates movement of the valve member toward the fluid passage opening side by contacting the valve member;
An electromagnetic valve device comprising:
The valve member has at least one protrusion protruding from an opposing end face opposing the regulating portion,
The protrusion is formed of rubber, and a base end of the protrusion forms a boundary with the opposed end surface in one loop shape, and a protrusion end surface of the protrusion abutting on the regulating portion is directed from the top to the boundary side. A solenoid valve device characterized in that the solenoid valve device has a shape that is separated from the regulating portion with time. The electromagnetic valve device according to claim 1, wherein a plurality of the protrusions are arranged at equal intervals around a center axis of the opposed end surface. 3. The electromagnetic valve device according to claim 1, wherein the protrusion is formed of rubber having a deflection amount of 0.23 mm or more upon collision with the restricting portion. 4. The electromagnetic valve device according to claim 3, wherein the projection is formed of fluoro rubber. The electromagnetic valve device according to any one of claims 1 to 4, wherein the projection is formed by integral rubber molding with the valve member. The electromagnetic valve device according to any one of claims 1 to 5, wherein the valve member is supported by the supporting member having elasticity such that the valve member can reciprocate. The electromagnetic valve device according to claim 6, wherein the support member is formed of a plate-like elastic material and has a cutout hole that penetrates in a plate thickness direction.

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