JP2015218810A - solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve capable of suppressing operation sound in reciprocated movement of a valve body.SOLUTION: A plunger 20-1 moves onto the side of a valve seat 13 with energization force of a spring 21, and moves onto the side of a pin 19 with electromagnetic attraction force of a solenoid part. A resin valve body 23 provided on the end surface of the plunger 20-1 has a projection part 23a on a surface contacting with the valve seat 13, and a projection part 23b on a surface of contacting with the pin 19. At the time of contact, contact sound (operation sound) is suppressed by elastically deforming the projection parts 23a, 23b.

Description

  The present invention relates to an electromagnetic valve that opens and closes a fluid passage.

  There is a tendency to shift from a gasoline vehicle to a clean vehicle (for example, HEV; Hybrid Electric Vehicle) with a low environmental load due to improvement in fuel consumption and exhaust gas regulations. Therefore, the frequency of engine operation decreases due to the idle stop, the motor drive mode, and the like, and the processing timing of the transpiration gas is reduced in the transpiration gas processing system using the engine negative pressure. As a countermeasure, a large flow rate of a solenoid valve that controls the flow of the transpiration gas is required.

  In order to increase the flow rate of the solenoid valve, it is necessary to increase the opening amount of the valve portion (enlarge seal diameter, increase stroke). However, when the seal diameter is increased, the layout performance is deteriorated by increasing the size of the solenoid valve, and when the stroke is increased, the operation noise is increased. Therefore, in Patent Document 1, for example, three protrusions having a semicircular cross section are formed on the rubber part on the ON side of the valve body in order to suppress the operation noise, thereby reducing the impact.

JP 200400741 A

  In the case of the above-mentioned Patent Document 1, depending on the quality of each protrusion, there is a concern that the movable iron core is tilted when ON and the rattling sound (operating sound) increases. Further, the rubber shape on the OFF side of the valve body is a shape that emphasizes sealing properties, and a buffering effect at the time of contact cannot be expected. As described above, the conventional electromagnetic valve has a problem in that the operation noise during the reciprocating movement of the valve body cannot be sufficiently suppressed.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electromagnetic valve capable of suppressing an operation sound when the valve body reciprocates.

  An electromagnetic valve according to the present invention includes a valve seat provided in a fluid passage, a rubber valve body that opens and closes the fluid passage by contacting and separating from the valve seat, and a solenoid that generates an electromagnetic attractive force in a core by energizing a coil. And a spring that generates an urging force in a direction opposite to the electromagnetic attraction force, and a valve body, and a plunger that reciprocates in a direction to open and close the fluid passage by the electromagnetic attraction force and the urging force, The valve body is provided with a pin that is in contact with a surface opposite to the surface that contacts and separates from the valve seat and restricts movement of the plunger, and the valve body has a protrusion on each of the surface that contacts and separates from the valve seat and the surface that contacts the pin. It is what you have.

  An electromagnetic valve according to the present invention includes a valve seat provided in a fluid passage, a rubber valve body that opens and closes the fluid passage by contacting and separating from the valve seat, and a solenoid that generates an electromagnetic attractive force in a core by energizing a coil. And a spring that generates an urging force in a direction opposite to the electromagnetic attraction force, and a valve body, and a plunger that reciprocates in a direction to open and close the fluid passage by the electromagnetic attraction force and the urging force, A pin that contacts a surface opposite to the surface that contacts and separates from the valve seat and restricts the movement of the plunger, the valve body has a protrusion on the surface that contacts and separates from the valve seat, and the core is the valve body And a pin having a protrusion that enters the inside of the plunger when the pin is in contact with the pin.

  According to the present invention, since the protrusion is formed on each of the surface of the valve body that contacts and separates from the valve seat and the surface of the valve body that contacts the pin, when the valve body reciprocates and contacts the valve seat and the pin, each protrusion The part is elastically deformed to suppress operation noise.

  According to the present invention, since the protrusion is formed on the surface of the valve body that is in contact with and away from the valve seat, the protrusion is elastically deformed when the valve body comes into contact with the valve seat to suppress the operation noise. In addition, since the core is formed with a protruding portion that enters the inside of the plunger when the valve body and the pin are in contact with each other, the axial electromagnetic force (reciprocating direction) is increased by increasing the electromagnetic attracting force in the radial direction of the plunger. ) Electromagnetic attraction force is reduced, and the operating noise when the valve body comes into contact with the pin is suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram of the transpiration gas processing system using the solenoid valve concerning Embodiment 1 of this invention. It is sectional drawing which shows the internal structure of the solenoid valve which concerns on Embodiment 1, and is a valve closing state. It is sectional drawing which expanded the plunger among the solenoid valves which concern on Embodiment 1, FIG. 3 (a) shows a valve closing state, FIG.3 (b) shows a valve opening state. It is sectional drawing which expanded the plunger among the solenoid valves which concern on Embodiment 2 of this invention. It is sectional drawing which expanded the plunger among the solenoid valves which concern on Embodiment 3 of this invention. FIG. 10 is a cross-sectional view showing a modified example of the plunger of the third embodiment. FIG. 10 is a cross-sectional view showing another modified example of the plunger of the third embodiment. FIG. 10 is a cross-sectional view showing another modified example of the plunger of the third embodiment. It is sectional drawing which expanded the plunger and core among the solenoid valves which concern on Embodiment 4 of this invention. In Embodiment 4, it is a graph which shows the electromagnetic force curve with and without a core protrusion. It is a figure explaining the electromagnetic attraction force which acts between the sliding part of the plunger of Embodiment 4, and the protrusion part of a core. FIG. 10 is a cross-sectional view showing a modification of the core protrusion of the fourth embodiment. FIG. 10 is a cross-sectional view showing another modification of the core protrusion of the fourth embodiment. FIG. 10 is a cross-sectional view showing another modification of the core protrusion of the fourth embodiment. It is sectional drawing which expanded the plunger among the solenoid valves which concern on Embodiment 5 of this invention. In Embodiment 5, it is a graph which shows the relationship between the full length of a sliding part, and an inclination angle. In Embodiment 5, it is a graph which shows the relationship between the inclination angle of a sliding part, and rattling sound. It is a top view which shows the external appearance of the solenoid valve which concerns on Embodiment 6 of this invention.

Embodiment 1 FIG.
FIG. 1 is an overall configuration diagram showing a transpiration gas treatment system in an automobile. Gasoline is very volatile, and the pressure inside the sealed fuel tank 1 is high. Therefore, after temporarily adsorbing only the vaporized gas component in a device filled with activated carbon called canister 2, the vaporized gas component is Release the removed gas into the atmosphere. After the engine 5 is started, the negative pressure generated in the intake manifold 4 causes a mixed gas of air and transpiration gas to flow from the canister 2 to the engine 5 and combustion occurs. The electromagnetic valve 3 controls the amount of the mixed gas introduced into the engine 5.

  FIG. 2 is a cross-sectional view showing the internal configuration of the electromagnetic valve 3, which is in a closed state. 3A and 3B are enlarged cross-sectional views of the plunger 20-1, in which FIG. 3A shows a valve closed state and FIG. 3B shows a valve open state. In the valve seat 10, a port 11 communicating with the canister 2 and a port 12 communicating with the engine 5 are formed, and a valve seat 13 is formed in a passage connecting the port 11 and the port 12. The valve seat 13 is a circular opening. The solenoid unit 14 includes a coil 15, a core 16, a plate 17, and a yoke 18. The nonmagnetic pin 19 is installed so as to protrude from the end of the core 16 toward the hollow portion 14 a of the solenoid unit 14, and a plunger 20-1 and a spring 21 are installed on the outer peripheral side of the protruding pin 19. ing.

  The plunger 20-1 is composed of a magnetic sliding portion 22 and a rubber valve body 23. The sliding portion 22 has a bottomed cylindrical shape and is installed in the hollow portion 14a of the solenoid portion 14 with a clearance that allows reciprocal movement.

When the coil 15 is not energized (when OFF), the plunger 20-1 is biased in the direction of the valve seat 13 by the valve closing force (biasing force) of the spring 21, and the valve body 23 comes into contact with the valve seat 13, The flow path connecting the ports 11 and 12 is closed.
By energizing the coil 15 (when ON), a magnetic field is generated in the core 16, the plate 17, and the yoke 18, which are magnetic bodies, and a valve opening force (electromagnetic attractive force) larger than the valve closing force (biasing force) of the spring 21. ) Acts, the plunger 20-1, which is a magnetic body, is attracted to the core 16, the valve body 23 is separated from the valve seat 13, and a flow path that connects the ports 11 and 12 is secured. At this time, the vaporized gas flows through the valve seat 10 due to the negative pressure generated in the engine 5. Moreover, when the valve body 23 contacts the pin 19, the movement of the plunger 20-1 toward the core 16 is restricted.

  An annular protrusion 23a is formed on the side of the valve body 23 that contacts the valve seat 13 (OFF side). On the other hand, on the side of the valve body 23 that contacts the pin 19 (ON side), an annular protrusion 23b is formed by removing the rubber material. By forming the protrusions 23a and 23b on both the OFF side and the ON side of the valve body 23, the area that comes into contact with the valve seat 13 and the pin 19 is reduced, and it becomes easy to positively elastically deform when contacted. . Thereby, the amount of bending of rubber increases, the buffering effect is improved, and the contact sound (operation sound) is suppressed.

In the configuration example of FIG. 3, the protrusion 23 b is formed by thinning the ON side of the valve body 23, but a protrusion similar to the OFF side may be provided without being thinned.
Further, by increasing the curvature of the tips of the protrusions 23a and 23b (decreasing the radius of curvature), the area in contact with the valve seat 13 and the pin 19 is further reduced, and the elastic deformation is more positive when contacted. Therefore, the buffering effect is improved.

  As described above, according to the first embodiment, the valve body 23 of the electromagnetic valve 3 is configured to have the protrusions 23a and 23b on the surface contacting and separating from the valve seat 13 and the surface contacting the pin 19, respectively. When the valve body 23 comes into contact with the valve seat 13 and the pin 19, the protrusions 23 a and 23 b are elastically deformed to suppress operation noise.

Embodiment 2. FIG.
FIG. 4 is an enlarged cross-sectional view of the plunger 20-2 in the electromagnetic valve 3 according to the second embodiment. The configuration of the electromagnetic valve 3 other than the plunger 20-2 is the same as that in FIG.
In the configuration example of FIG. 4, the thickness of the rubber material on both the OFF side and the ON side of the valve body 23 is increased to form the thick portions 23 c and 23 d. By forming the thick portions 23c and 23d, the valve body 23 is positively easily elastically deformed when coming into contact with the valve seat 13 and the pin 19, and the buffering effect is further improved.

  In FIG. 4, the thick portions 23 c and 23 d are formed on both the OFF side and the ON side of the valve body 23, but only one of the OFF side and the ON side may be used.

Embodiment 3 FIG.
FIG. 5 is an enlarged cross-sectional view of the plunger 20-3 in the electromagnetic valve 3 according to the third embodiment. The configuration of the electromagnetic valve 3 other than the plunger 20-3 is the same as that shown in FIG.
When the thick portions 23c and 23d are formed on the valve body 23, the rubber material swells with fuel or the like, so that there is a concern about a decrease in flow rate due to stroke deterioration. Further, sink marks of the rubber material are likely to occur, and there is a concern about the influence on the surface treatment such as non-adhesive treatment of the rubber material. Therefore, in the configuration example of FIG. 5, the opening area of the hole 22a of the sliding portion 22 is reduced as compared with the hole of FIG. This hole 22 a is a through hole for a rubber material when the valve body 23 is formed in the sliding portion 22.

  Compared to FIG. 4, FIG. 5 reduces the amount of rubber by reducing the hole 22 a, thereby suppressing the rubber swelling in the axial direction and preventing a decrease in flow rate due to stroke deterioration. Moreover, since the sink mark of the rubber material after the surface treatment can be reduced, it leads to improvement in adhesion of the surface treatment (suppression of wrinkles due to a difference in shrinkage rate between the rubber member and the surface treatment material).

As a specific example, the amount of swelling and sink marks can be reduced by setting the diameter φd of the hole 22a to the condition of the following expression (1) with respect to the diameter φD of the valve body 23 on the OFF side. However, the minimum value of the diameter φd of the hole 22a is a value that enables molding of a rubber material.
0.05 ≦ (φd / φD) ² <0.17 (1)

Here, FIGS. 6 to 8 show modifications of the plunger 20-3 of the third embodiment.
In the modification of FIG. 6, as a skeleton structure in which the sliding portion 22 is deformed, a protrusion 22 b that protrudes from the peripheral edge of the hole 22 a to the OFF side is provided. Thereby, in addition to the axial direction of the valve body 23, the amount of rubber swelling and sink can be reduced not only in the radial direction but also in the radial direction.
In the modified example of FIG. 7, a skeleton structure in which a bent portion 22c is added to the protruding portion 22b is used. Thereby, the swelling and sink amount of the rubber material can be further reduced.
In the modified example of FIG. 8, a protrusion 22d protruding to the ON side is provided in addition to the protrusion 22b protruding to the OFF side from the peripheral edge of the hole 22a. Thereby, the swelling and sink amount of the rubber material can be reduced on both the OFF side and the ON side. Moreover, it is also possible to add the bending part 22c to the protrusions 22b and 22d.

As described above, according to the third embodiment, the skeletal structure (for example, the protrusions 22b and 22d and the bending portion 22c) obtained by deforming the sliding portion 22 is provided in the thick portions 23c and 23d of the valve body 23. Therefore, the swelling and sink of the rubber material can be reduced, and the performance deterioration of the solenoid valve 3 can be suppressed.
The shape of the skeleton structure is not limited to the illustrated example. In the illustrated example, the skeletal structure is formed by deforming the sliding portion 22, but it may be formed by another member.

Embodiment 4 FIG.
FIG. 9 is an enlarged cross-sectional view of the plunger 20-4 and the core 16-4 in the electromagnetic valve 3 according to the fourth embodiment. The configuration of the solenoid valve 3 other than the plunger 20-4 and the core 16-4 is the same as that shown in FIG. Further, the valve body 23 of the plunger 20-4 may have any of the configurations shown in FIGS.
In the configuration example of FIG. 9, the protrusion 16a is formed at the end of the core 16-4 on the plunger 20-4 side. At the time of valve opening (ON time), the protrusion 16a enters the inside of the plunger 20-4, thereby increasing the radial electromagnetic attractive force F2 and reducing the axial electromagnetic attractive force F1. Reduce the impact force. Thereby, the contact sound (operation sound) with plunger 20-4 and pin 19 is controlled.

  In FIG. 10, the graph of the electromagnetic force curve with and without the protrusion 16a of the core 16-4 is shown. The vertical axis of the graph is the axial electromagnetic attractive force F1, and the horizontal axis is the air gap G between the plunger 20-4 and the core 16-4. The plunger 20-4 is movable between an ON position and an OFF position. Moreover, FIG. 11 is a figure explaining the electromagnetic attractive force F1-F3 which acts between the sliding part 22 of the plunger 20-4, and the protrusion 16a of the core 16-1.

When the core 16-4 has no protrusion 16a, the axial electromagnetic attracting force F1 increases as the air gap G between the plunger 20-4 and the core 16-4 becomes shorter.
On the other hand, when the core 16-4 has the protrusion 16a, when the distance between the plunger 20-4 and the protrusion 16a is shortened, the oblique electromagnetic attracting force F3 is added to the axial electromagnetic attracting force F1. The electromagnetic attracting force F1 in the axial direction temporarily increases. When the distance is further shortened and the protrusion 16a enters the inside of the plunger 20-4, the electromagnetic attracting force F2 in the radial direction works to reduce the electromagnetic attracting force F1 in the axial direction. Thereby, as indicated by an arrow in the graph of FIG. 10, the electromagnetic attracting force F1 in the axial direction at the ON position is reduced, and the impact force is reduced.

Here, FIGS. 12 to 14 show modified examples of the core 16-4 of the fourth embodiment.
In the modification of FIG. 12, a protrusion 16b having a shape whose diameter gradually decreases toward the tip is provided at the end of the core 16-4. In the modified example of FIG. 13, a reverse tapered protrusion 16 c whose diameter increases smoothly toward the tip is provided at the end of the core 16-4. In the modification of FIG. 14, a taper-shaped protrusion 16 d whose diameter smoothly decreases toward the tip is provided at the end of the core 16-4.
Similarly to the protrusion 16a, the protrusions 16b to 16d can also increase the radial electromagnetic attractive force F2 and reduce the axial electromagnetic attractive force F1 to reduce the impact force. Moreover, the electromagnetic force curve of the electromagnetic attracting force F1 in the axial direction can be adjusted by changing the shapes of the protrusions 16a to 16d.

As described above, according to the fourth embodiment, the valve body 23 of the electromagnetic valve 3 has the protrusion 23a on the surface contacting and separating from the valve seat 13, and the core 16-4 has the valve body 23 that contacts the pin 19. It was set as the structure which has the protrusion 16a of the shape which enters the inside of the plunger 20-4 in the state which contact | connected. For this reason, when the valve body 23 comes into contact with the valve seat 13, the protrusion 23a is elastically deformed to suppress the operation noise. Further, the electromagnetic attracting force in the radial direction of the plunger 20-4 is increased, so that the electromagnetic attracting force in the axial direction is reduced, and the operation sound when the valve body 23 comes into contact with the pin 19 is suppressed.
In addition, the shape of the core protrusion is not limited to the illustrated example, and may be any shape that generates a force (side force) in the radial direction.

  In addition, since the operating sound when the valve body 23 contacts the pin 19 can be suppressed by forming the protrusion 16a on the core 16-4, the surface of the valve body 23 that contacts the pin 19 has no protrusion 23b. May be.

Embodiment 5 FIG.
FIG. 15 is an enlarged cross-sectional view of the plunger 20-5 in the electromagnetic valve 3 according to the fifth embodiment. The configuration of the electromagnetic valve 3 other than the plunger 20-5 is the same as that shown in FIG. Further, the valve body 23 of the plunger 20-5 may have any configuration shown in FIGS.
In the configuration example of FIG. 15, the inclination angle θ generated by the sliding clearance between the sliding portion 22 of the plunger 20-5 and the hollow portion 14a of the solenoid portion 14 is set to the sliding portion 22 while maintaining the sliding clearance. Is increased by increasing the total length L in the reciprocating direction, and rattling noise (operation noise) during operation is suppressed.

  FIG. 16 is a graph showing the relationship between the total length L of the sliding portion 22 and the inclination angle θ. FIG. 17 is a graph showing the relationship between the inclination angle θ of the sliding portion 22 and the rattling sound. When the total length L of the sliding portion 22 is increased, the inclination angle θ is reduced and the rattling sound is also reduced. Since the rattling noise suddenly decreases at the boundary of the inclination angle θ1 (below the allowable sound volume), the total length L of the sliding portion 22 is set to the total length L (≧ L1) so as to be equal to or less than the inclination angle θ1. It is preferable to do.

  As described above, according to the fifth embodiment, the plunger 20-5 is installed in the hollow portion 14a formed in the solenoid portion 14 with a clearance that can be reciprocated, and the plunger 20-5 generated by the clearance is provided. The inclination angle θ is set to an angle at which the rattling sound is less than the allowable sound volume when the full length L of the plunger 20-5 is extended in the reciprocating direction (that is, the inclination angle θ1 or less). A rattling sound (operation sound) can be suppressed.

Embodiment 6 FIG.
FIG. 18 is a plan view showing the external appearance of the solenoid valve 3 according to the sixth embodiment. The same or corresponding parts as those in FIG.
In the configuration example of FIG. 18, one or more lightening holes 18 a are provided in the yoke 18-6 that covers the outer periphery of the electromagnetic valve 3. The vibration at the time of operation of the solenoid valve 3 is transmitted to the yoke 18-6 and the like to be radiated sound (operating sound). Therefore, by providing the hollow hole 18a, the area of the vibration transmitting portion is reduced and the radiated sound is reduced. Suppress. In addition, the member which forms the lightening hole 18a is not limited to the yoke 18-6, What is necessary is just the member (for example, outer wall of the solenoid part 14) which transmits a vibration to the exterior.

  As described above, according to the sixth embodiment, since the hollow hole 18a is formed in the outer wall of the solenoid unit 14, the emission sound (operation sound) can be suppressed by reducing the surface area of the vibration transmitting portion.

  In addition, although the electromagnetic valve 3 of the said Embodiment 1-6 was the structure opened by the electromagnetic attraction force of the solenoid part 14, and closed by the urging | biasing force of the spring 21, conversely, the electromagnetic of the solenoid part 14 A configuration in which the valve is closed by a suction force and is opened by a biasing force of the spring 21 may be employed.

  In addition to the above, within the scope of the present invention, the present invention can freely combine each embodiment, modify any component of each embodiment, or omit any component of each embodiment. It is.

  1 Fuel tank, 2 canister, 3 solenoid valve, 4 intake manifold, 5 engine, 10 valve seat, 11, 12 port, 13 valve seat, 14 solenoid part, 14a hollow part, 15 coil, 16, 16-4 core, 16a ~ 16d Protrusion, 17 Plate, 18, 18-6 Yoke, 18a Filling hole, 19 pin, 20-1 to 20-5 Plunger, 21 Spring, 22 Sliding part, 22a Hole, 22b, 22d Protrusion (Frame Structure), 22c Bending part (skeleton structure), 23 Valve body, 23a, 23b Protruding part, 23c, 23d Thick part.

Claims (7)

A valve seat provided in the fluid passage;
A rubber valve body that opens and closes the fluid passage in contact with and away from the valve seat;
A solenoid that generates an electromagnetic attractive force in the core by energizing the coil;
A spring that generates a biasing force in a direction opposite to the electromagnetic attractive force;
A plunger configured to reciprocate in a direction to open and close the fluid passage by the electromagnetic attracting force and the biasing force;
A pin that contacts the surface opposite to the surface of the valve body that contacts and separates from the valve seat and regulates the movement of the plunger;
The said valve body has a protrusion in each of the surface contacted / separated to the said valve seat, and the surface contact | abutted to the said pin, The solenoid valve characterized by the above-mentioned.   2. The electromagnetic valve according to claim 1, wherein the valve body has a thick portion of the rubber on at least one of a surface contacting and separating from the valve seat and a surface contacting the pin.   The solenoid valve according to claim 2, wherein the valve body has a skeleton structure in a thick portion of the rubber.   4. The core according to any one of claims 1 to 3, wherein the core has a protrusion having a shape that enters the inside of the plunger when the valve body and the pin are in contact with each other. Solenoid valve.   The plunger is installed in a hollow portion formed in the solenoid portion with a clearance that allows the reciprocal movement, and an inclination angle of the plunger caused by the clearance is such that the entire length of the plunger is set in the direction of the reciprocating movement. The electromagnetic valve according to any one of claims 1 to 4, wherein the electromagnetic valve has an angle at which the rattling sound is equal to or less than an allowable sound volume when extended.   The solenoid valve according to any one of claims 1 to 5, wherein a hole is formed in an outer wall of the solenoid part. A valve seat provided in the fluid passage;
A rubber valve body that opens and closes the fluid passage in contact with and away from the valve seat;
A solenoid that generates an electromagnetic attractive force in the core by energizing the coil;
A spring that generates a biasing force in a direction opposite to the electromagnetic attractive force;
A plunger configured to reciprocate in a direction to open and close the fluid passage by the electromagnetic attracting force and the biasing force;
A pin that contacts the surface opposite to the surface of the valve body that contacts and separates from the valve seat and regulates the movement of the plunger;
The valve body has a protrusion on a surface contacting and separating from the valve seat,
The electromagnetic valve according to claim 1, wherein the core has a protrusion having a shape that enters the inside of the plunger when the valve body and the pin are in contact with each other.

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