JP2021156297A - Solenoid valve and manufacturing method of solenoid valve - Google Patents

Abstract

To solve problems in a conventional solenoid valve integrally provided with a cylindrical volume expanding portion formed integrally with a port portion to prevent propagation of pressure pulsation, composed of a bottomed cylinder opened at one end, and securing airtightness by fixing a cover disc as a separate component, though it is opened at one end face, that the number of components for the cover disc as the separate component is increased, and the number of processes for fixing the cover disc is increased.SOLUTION: A solenoid valve includes: a solenoid portion linearly moving a valve element by duty driving; a housing provided with a fluid passage opened and closed by the valve element in a linear motion direction of the valve element; a tubular first port formed on the fluid passage of the housing and communicated to an upstream side of the fluid passage; a tubular second port formed on the fluid passage of the housing and communicated to a downstream side of the fluid passage; and a bottomed chamber room provided with a fluid reservoir portion for reserving a fluid generated in communication with the fluid passage. The first port, the second port and the chamber room are molded integrally with the housing.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to solenoid valves used in fuel transpiration gas treatment systems for gasoline automobile engines.

The evaporative fuel adsorption device of a vehicle engine is composed of a canister that adsorbs the evaporative fuel generated in the fuel tank, an electromagnetic valve, and piping. The solenoid valve is arranged between the canister and the intake pipe, and the flow rate of the evaporated fuel flowing between the intake pipe and the canister is controlled by the on / off control (duty drive) of the solenoid valve, and a predetermined amount of the evaporated fuel is supplied to the intake pipe. Supply to the engine via. However, when the solenoid valve is duty-driven, pressure pulsation is generated in the flow in the pipe due to the on / off of the valve, and an abnormal noise is generated in the vehicle interior. Therefore, in order to prevent the propagation of pressure pulsation, it is formed by a bottomed cylinder that is integrally formed with the port part and one end is open, and one end face is open, but the cover disk of another part is fixed. By doing so, a cylindrical volume expansion portion that ensures airtightness is integrally provided. (Patent Document 1)

JP-A-2002-286153

In order to prevent the propagation of pressure pulsation, the above-mentioned conventional solenoid valve is integrally formed with a port portion and is formed by a bottomed cylinder having one end open, and one end face is open, but a separate component. By fixing the cover disk, a cylindrical volume expansion portion that ensures airtightness is integrally provided. Therefore, there is a problem that the number of parts of the cover disk, which is a separate part, increases. In addition, there is also a problem that the number of steps for fixing the cover disk is increased.

The present disclosure has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a solenoid valve that can reduce the propagation of pressure pulsation, is easy to manufacture, and can reduce the number of parts.

The solenoid valve according to the present disclosure is formed in a solenoid portion that linearly moves the valve body by duty drive, a housing that forms a fluid passage that is opened and closed by the valve body in the linear motion direction of the valve body, and a fluid passage of the housing. A tubular first port communicating with the upstream side of the fluid passage, a tubular second port formed in the fluid passage of the housing and communicating with the downstream side of the fluid passage, and a part of the first port having a fluid passage. It is provided with a bottomed chamber chamber provided with a fluid retaining portion for collecting the fluid generated by the communication, and the first port, the second port, and the chamber chamber are integrally molded with the housing.

In the solenoid valve configured as described above, a chamber chamber that communicates with the fluid passage and the first port to store the fluid and has a bottom to reduce the propagation of pressure pulsation is integrally molded in the housing. As a result, since the cover disk can be eliminated, the propagation of pressure pulsation can be reduced, and an electromagnetic valve that can be easily manufactured and the number of parts can be reduced can be obtained.

It is a figure which shows the configuration example of the evaporation gas processing system of the gasoline automobile engine using the solenoid valve which concerns on Embodiment 1. FIG. It is sectional drawing which shows the structural example of the solenoid valve which concerns on Embodiment 1, and shows the valve closed state. It is a figure which shows the state of the dust trap of the solenoid valve which concerns on Embodiment 1. FIG. It is sectional drawing which shows the state which set the mold which molds the valve ASSY of the solenoid valve which concerns on Embodiment 1. It is sectional drawing which shows the structural example of the solenoid valve which concerns on Embodiment 2, and shows the valve closed state. It is sectional drawing which shows the state which set the mold which molds the valve ASSY of the solenoid valve which concerns on Embodiment 2.

Embodiment 1.
The solenoid valve according to the first embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a diagram showing a configuration example of a vaporization gas treatment system for a gasoline automobile engine using a solenoid valve according to the first embodiment. FIG. 2 is a cross-sectional view showing a configuration example of the solenoid valve according to the first embodiment, and shows a valve closed state. FIG. 3 is a diagram showing a state of a dust trap of the solenoid valve according to the first embodiment. Further, FIG. 4 is a cross-sectional view showing a state in which a mold for molding the valve ASSY of the solenoid valve according to the first embodiment is set.

As shown in FIG. 1, the vaporization gas treatment system of a gasoline automobile engine includes a canister 4 having a built-in activated charcoal that adsorbs vaporized gas evaporated in a gasoline tank 3, and a purge pipe 5 that connects the canister 4 and the inlet pipe 1. , A purge solenoid valve (solenoid valve) 6 for controlling the flow rate of vaporized gas flowing through the purge pipe 5 is provided. The air containing the transpiration gas evaporated in the gasoline tank 3 flows to the canister 4, the transpiration gas is adsorbed on the activated carbon in the canister 4, and only clean air is released to the atmosphere. The vaporized gas accumulated in the canister 4 flows to the engine through the canister 4, the purge pipe 5, and the intake manifold pipe 1 by being sucked by the negative pressure generated in the intake manifold pipe 1 downstream of the throttle valve 2. , Burned.

As shown in FIG. 2, the solenoid valve 100 is the purge solenoid valve (solenoid valve) 6 shown in FIG. The solenoid valve 100 includes a duty-driven solenoid unit 10 and a valve ASSY 20 connected to a purge pipe 5 (not shown). The solenoid portion 10 and the valve ASSY 20 are joined. The solenoid valve 100 is attached to the vehicle by bolts (not shown) or the like. Further, a power supply for duty-driving the solenoid valve 100 is connected to the connector 12 provided on the solenoid valve 100.

The solenoid portion 10 includes a yoke 11, a connector 12, a solenoid coil 13, a core 14, a pin 15, a plunger 16, a spring 17, and a valve body 18. Further, the yoke 11, the solenoid coil 13, the core 14, the pin 15, the plunger 16, the spring 17, and the valve body 18 are arranged coaxially.

The yoke 11 has a bottomed substantially cylindrical shape and is made of metal.

The connector 12 is formed on the outer periphery of the yoke 11 by insert molding with resin.

The solenoid coil 13 has a substantially cylindrical shape in which a conducting wire is wound, and is housed in a yoke 11.

The core 14 has a substantially cylindrical shape made of metal and is provided inside the solenoid coil 13. The core 14 is excited by the solenoid coil 13 to generate a magnetic attraction force.

The pin 15 has a substantially cylindrical shape made of metal and protrudes from the core 14 on the opening side of the yoke 11. The pin 15 forms a magnetic path together with the core 14 to generate a magnetic attraction.

The plunger 16 has a bottomed substantially cylindrical shape made of metal, and a pin 15 protruding from the core 14 is loosely inserted. The plunger 16 is projected by receiving the urging force of the spring 17, and is pulled in by the magnetic attraction force of the core 14 and the pin 15, and makes a linear reciprocating motion at the duty frequency of the duty signal.

The spring 17 is loosely inserted into the pin 15 and arranged inside the plunger 16. The spring 17 urges the core 14 and the plunger 16.

The valve body 18 has a substantially cylindrical shape with a tubular groove on the outer circumference, and is formed of an elastic body such as rubber. The valve body 18 is fixed to the plunger 17 by fitting a tubular groove provided on the outer periphery into a hole formed in the bottom of the plunger 17. The valve body 18 abuts or detaches from the valve seat 27 by the linear reciprocating motion of the plunger 17 to open and close the fluid passage 22.

The valve ASSY 20 is composed of a housing 21, a fluid passage 22 formed in the housing 21 for flowing fluid, a first port 23, a second port 24, a chamber chamber 25, a communication passage 26, and a valve seat 27. NS.

The housing 21 is formed by resin molding.

The fluid passage 22 is a substantially cylindrical cavity and is formed in the housing 21. The fluid passage 22 is formed coaxially with the linear motion direction of the valve body 18. A valve seat 27 with which the valve body 18 abuts is provided on one side of the fluid passage 22, and the other side communicates with the first port.

The first port 23 is a tubular shape protruding in the radial direction of the fluid passage 22 and is formed in the housing 21. The first port 23 is provided on the other side, which is the upstream side of the fluid passage 22. One side of the first port 23 is open and is connected to the purge pipe 5. The other side communicates with the communication passage 26 and the chamber chamber 25.

The second port 24 is a tubular shape protruding in the radial direction of the fluid passage 22 and is formed in the housing 21. The second port 24 is provided on the side of the valve body 18 which is the downstream side of the fluid passage 22. One side of the second port 24 is open and is connected to the purge pipe 5. The other side is communicated with the communication passage 26.

The chamber chamber 25 is formed in the housing 21 in a tubular shape that is provided in the direction opposite to the opening of the first port 23 and extends coaxially with the first port 23 and projects. Further, the protruding end of the chamber chamber 25 is integrally closed by resin molding of the housing 21. Further, the chamber chamber 25 and the first port 23 are connected coaxially and with the same inner diameter.

The communication passage 26 is formed in the housing 21 by an annular cavity provided around the valve seat 27 and a cylindrical space in which the valve body 18 directly moves. The communication passage 26 communicates with the second port 24 and the fluid passage 22.

The valve seat 27 is a cylindrical end on the side of the communication passage 26 provided in the fluid passage 22, and is formed in the housing 21. The valve body 18 abuts or detaches from the valve seat 27 to open and close the fluid passage 22.

Next, the operation of the solenoid valve configured as described above will be described with reference to FIGS. 2 and 3.
As shown in FIG. 2, the transpiration gas flows in from the opening side of the first port 23 connected to the canis 4 (not shown) side of the purge pipe 5 (not shown). The inflowing transpiration gas is circulated in the fluid passage 22 communicating with the first port 23. Then, the transpiration gas is circulated to the communication passage 26 as the valve body 18 is opened and closed at the duty frequency by the duty drive. The transpiration gas that has flowed into the communication passage 26 is circulated to the second port 24 that communicates with the communication passage 26. The transpiration gas that has flowed into the second port 24 is circulated from the opening side of the second port 24 to the intake manifold pipe 1 (not shown) side of the purge pipe 5 (not shown).

Further, the flow rate of the transpired gas is controlled by opening and closing the valve body 18 by duty driving at an arbitrary duty frequency. The propagation of pressure pulsation due to duty drive is reduced by dispersing the pressure by retaining the fluid in a large volume of the chamber chamber 25 communicating with the first port 23. As a result, the pulsating sound propagating in the vehicle interior is reduced. The volume of the chamber chamber 25 is customized in inner diameter and length according to the loudness of the pulsating wave and the pulsating sound.

As shown in FIG. 3, for example, the solenoid valve 100 is attached to the vehicle with an inclination α. The chamber chamber 25 is arranged below the fluid passage 22 and the first port 23 in the direction of gravity. Liquid dust 28 such as oil mist staying in the fluid passage 22 and the first port 23 is flowed to the dust trap 29 on the protruding end side of the chamber chamber 25. Only the fluid passage 22 and the first port 23 of the solenoid valve 100 may be tilted to form the solenoid valve 100.

Next, a method of manufacturing the solenoid valve configured as described above will be described with reference to FIG.
As shown in FIG. 4, in the first step, the first slide mold 42 for molding the fluid passage, the first port 23, and the chamber chamber 25 are integrally molded in the core mold 41. 43 and the third slide mold 44 for molding the second port 24 are set, the mold mold (not shown) is molded so as to cover the core mold 41, and then the resin is injected. Mold the housing 21. The molding may be performed using a metal material such as aluminum.

In the second step, after the resin is solidified, the first slide mold 42 is slid to the solenoid portion 10 side, and the second slide mold 43 and the third slide mold 44 are slid to the opening side, respectively. After the removal, the housing 21 is taken out by opening the mold (not shown). As a result, the valve ASSY 20, which is the housing 21 forming the fluid passage 22, the first port 23, the second port 24, the chamber chamber 25, the communication passage 26, and the valve seat 27, is molded. Further, the protruding end of the chamber chamber 25 is integrally closed by molding. The order of removing the first slide mold 42, the second slide mold 43, and the third slide mold 44 and opening the mold mold (not shown) is not limited to this, and is free. Combination is possible.

After that, the solenoid valve 100 is completed by joining the valve ASSY 20 to the solenoid portion 10.

As described above, in the solenoid valve shown in the first embodiment, a tubular valve provided in the direction opposite to the opening of the first port 23 and extending coaxially with the first port 23 and protruding. The chamber chamber 25 of the above is integrally formed with the housing 21. As a result, the pressure of the pressure pulsation is dispersed by accumulating the fluid in the large volume of the chamber chamber 25. As a result, the propagation of pressure pulsation can be reduced.
The effect of reducing the propagation of pressure pulsation depends on the volume of the chamber chamber 25. For example, when the inner diameter of the chamber chamber 25 is φ18 mm and the length is 20 mm, the volume is 5.1 cc, and the gasoline vehicle. It has been found to be useful for practical use of engines. Here, the inner diameter and the length are determined by the performance of the gasoline automobile engine, the mounting layout of the solenoid valve, and the like.

Further, the first port 23 and the chamber chamber 25 are integrally molded with the housing 21 by the second slide mold 43. After that, the second slide mold 43 is slid toward the opening side and removed. As a result, the protruding end of the chamber chamber 25 is integrally molded and closed with the housing 21. As a result, it is possible to eliminate the need for another component that closes the chamber chamber 25 and its attachment (for example, welding), and also has the effect of reducing the number of components and facilitating manufacturing.

Further, the protruding end of the chamber chamber 25 is integrally molded and closed with the housing 21. As a result, there is no attachment site for another component that closes the chamber chamber 25, and as a result, fluid leakage can be avoided and the sealing property can be improved.

Further, the solenoid valve 100 is attached to the vehicle with an inclination α, for example. As a result, the chamber chamber 25 is arranged below the fluid passage 22 and the first port 23 in the direction of gravity. As a result, the liquid dust 28 such as oil mist staying in the fluid passage 22 and the first port 23 is flowed to the dust trap 29 on the protruding end side of the chamber chamber 25, so that the dust 28 is accumulated in the flow path. , It is possible to prevent the flow of evaporated gas from being obstructed, and it also has the effect of stabilizing the performance of the gasoline automobile engine.

By the way, the solenoid valve shown in the first embodiment described above has been described as a solenoid valve used in a vaporization gas treatment system of a gasoline automobile engine, but the present invention is not limited to this, and an electromagnetic valve that controls a fluid different from this is not limited thereto. It may be used as a valve.

Embodiment 2.
The solenoid valve of the second embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a cross-sectional view showing a configuration example of the solenoid valve according to the second embodiment, showing a valve closed state. FIG. 6 is a cross-sectional view showing a state in which a mold for molding the valve ASSY of the solenoid valve according to the second embodiment is set. The same reference numerals as those in FIGS. 5, 6, 6, 2 and 4, indicate the same or corresponding parts.

As shown in FIG. 5, in the solenoid valve 150 of the second embodiment, the solenoid valve 100 of the first embodiment coaxials the chamber chamber 25 with the first port 23 in the direction opposite to the opening of the first port 23. The chamber chamber 55 is extended coaxially with the fluid passage 52 in the direction opposite to the solenoid portion 10 of the fluid passage 52, as opposed to the one that is extended upward and configured to form in the housing 21. It is formed and configured in the housing 51.

That is, the configuration of the chamber chamber 55 is different from that of the chamber chamber 25 of the solenoid valve 100 shown in the first embodiment, and the other configurations are the same.

As shown in FIG. 6, in the method of manufacturing the electromagnetic valve 150 shown in the second embodiment, the electromagnetic valve of the first embodiment has a first slide mold 42 for forming a fluid passage in the core mold 41. , The core is obtained by setting and molding the second slide mold 43 for integrally molding the first port 23 and the chamber chamber 25 and the third slide mold 44 for molding the second port 24. The first slide mold 72 for integrally molding the fluid passage 52 and the chamber chamber 55 in the mold 71, the second slide mold 73 for molding the first port 53, and the third slide for molding the second port 54. After setting the mold 74 and molding, slide the first slide mold 72 to the solenoid portion 10 side, the second slide mold 73, and the third slide mold 74 to the opening side, respectively. After the removal, the housing 51 is taken out by opening the mold (not shown).

That is, the configurations of the first slide mold 72 and the second slide mold 73 are different from those of the first slide mold 42 and the second slide mold 43 in the method of manufacturing the solenoid valve 100 shown in the first embodiment. , Other configurations are the same.

Even in the solenoid valve shown in the second embodiment configured in this way, the solenoid valve having the same function as the solenoid valve shown in the first embodiment is provided in the direction opposite to the solenoid portion 10 of the fluid passage 52. A tubular chamber chamber 55 extending coaxially with the fluid passage 52 and projecting is integrally formed with the housing 51. As a result, the pressure of the pressure pulsation is dispersed by accumulating the fluid in the large volume of the chamber chamber 55. As a result, the propagation of pressure pulsation can be reduced.

Further, the fluid passage 52 and the chamber chamber 55 are integrally molded with the housing 51 by the first slide mold 72. After that, the first slide mold 72 is slid toward the solenoid portion 10 side and removed. As a result, the protruding end of the chamber chamber 55 is integrally molded and closed with the housing 51. As a result, it is possible to eliminate the need for another component that closes the chamber chamber 55 and its attachment (for example, welding), and also has the effect of reducing the number of components and facilitating manufacturing.

Further, the protruding end of the chamber chamber 55 is integrally molded and closed with the housing 51. As a result, there is no attachment site for another component that closes the chamber chamber 55, and as a result, fluid leakage can be avoided and the sealing property can be improved.

Further, in the solenoid valve 150, for example, the chamber chamber 55 is arranged below the fluid passage 52 and the first port 53 in the direction of gravity, which is the lower side in the drawing. As a result, the liquid dust 28 such as oil mist staying in the fluid passage 52 and the first port 53 flows to the bottom of the chamber chamber 55, so that the dust 28 accumulates in the flow path and hinders the flow of the evaporated gas. It also has the effect of stabilizing the performance of the gasoline automobile engine.

In addition, also in the above-mentioned second embodiment, like the first embodiment, it may be used as a solenoid valve for controlling a fluid different from this.

1 Inmani pipe, 2 Throttle valve, 3 Gas tank, 4 Canister, 5 Purge pipe, 6, 100, 150 Solenoid valve (purge solenoid valve), 10 Solenoid part, 11 Yoke, 12 Connector, 13 Solenoid coil, 14 core, 15 Pin, 16 plunger, 17 spring, 18 valve body, 20, 50 valve ASSY, 21, 51 housing, 22, 52 fluid passage, 23, 53 1st port, 24, 54 2nd port, 25, 55 chamber chamber, 26 Communication passage, 27 valve seat, 28 dust, 20 dust trap, 41, 71 core mold, 42, 72 1st slide mold, 43, 73 2nd slide mold, 44, 74 3rd slide mold,

Claims (7)

A solenoid part that moves the valve body directly by duty drive,
A housing having a fluid passage that is opened and closed by the valve body in the linear motion direction of the valve body, and a housing.
A tubular first port formed in the fluid passage of the housing and communicating with the upstream side of the fluid passage,
A tubular second port formed in the fluid passage of the housing and communicating with the downstream side of the fluid passage,
A part of the first port is provided with a bottomed chamber chamber provided with a fluid reservoir for accumulating fluid generated by communication with the fluid passage.
A solenoid valve characterized in that the first port, the second port, and the chamber chamber are integrally molded with the housing. The solenoid valve according to claim 1, wherein the chamber chamber is formed coaxially in the direction opposite to the opening of the first port. The solenoid valve according to claim 1, wherein the chamber chamber is formed coaxially with the solenoid portion of the fluid passage in the direction opposite to the solenoid portion. The solenoid valve according to any one of claims 1 to 3, wherein the chamber chamber is formed in a bottomed cylindrical shape. The solenoid valve according to any one of claims 1 to 4, wherein the chamber chamber is arranged below the fluid passage and the first port in the direction of gravity. A method for manufacturing a solenoid valve according to claim 2, wherein the solenoid valve is manufactured.
A first slide mold for molding the fluid passage in the core mold, a second slide mold for integrally molding the first port and the chamber chamber, and a third slide mold for molding the second port. In the first step of setting the housing and molding the housing,
A second step of sliding and removing the first slide mold, the second slide mold, and the third slide mold, respectively.
A method for manufacturing a solenoid valve, which comprises. A method for manufacturing a solenoid valve according to claim 3, wherein the solenoid valve is manufactured.
The first slide mold for integrally molding the fluid passage and the chamber chamber in the core mold, the second slide mold for molding the first port, and the third slide for molding the second port. The first step of setting the mold and molding the housing, and
A second step of sliding and removing the first slide mold, the second slide mold, and the third slide mold, respectively.
A method for manufacturing a solenoid valve, which comprises.

Images