JPH10132132A - Gasoline supplying solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform assembly of coils of two electromagnetic devices for controlling the supplying flow rate of gasoline and a valve main body. SOLUTION: A main valve chamber 31 for communicating an inflow part 37 with an outflow part 38, small flow rate passages 40a, 40b for communicating an inflow part 37 side with an outflow part 38 side, and pilot passages 42a, 42b for communicating the back pressure side of the main valve chamber 31 with the outflow part 38 side are formed on a valve main body 30. A small flow rate valve body 71 for opening or closing a small flow rate valve hole 41 on the intermediate part between the small flow rate valve passages 40a, 40b is provided, and a pilot valve body 70 for opening or closing a pilot valve hole 43 on the intermediate part between the pilot passages 42a, 42b is provided. A leakage small hole 51 for communicating the inflow part 37 side with the back pressure side of the main valve chamber 31 is formed on a main valve body 50 of a diaphragm for opening or closing the main valve hole 32. Both coils 75 of a pair of electromagnetic devices 72, 73 for advancing or retreating respective plungers 77 for opening or closing the small flow rate valve body 71 and the pilot valve body 70 are molded and integrated with each other by synthetic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasoline supply solenoid valve capable of adjusting a gasoline supply amount.

[0002]

2. Description of the Related Art Generally, gasoline is supplied by opening a nozzle valve connected to the end of a hose so that gasoline pumped from an oil storage tank by a pump is discharged from a nozzle through an electromagnetic valve. Thus, the supply amount of gasoline is controlled to a large flow rate at the beginning and to a small flow rate at the end of the supply.

[0003] As a conventional solenoid valve for controlling the gasoline supply flow rate, for example, a structure described in Japanese Patent Application Laid-Open No. 7-63276 is known. In this solenoid valve, a main valve chamber having a main valve hole communicating an inflow portion and an outflow portion with a valve body is formed, and a diaphragm main valve body for opening and closing the main valve hole is provided in the main valve chamber. Forming an outflow pilot flow passage for communicating the back pressure side and the outflow side of the inflow pilot passage, and providing an outflow pilot valve element in which a first pilot valve hole is opened and closed by an electromagnetic device at an intermediate portion of the outflow pilot flow passage; The inflow pilot flow path is formed to connect the pressure side to the back pressure side of the main valve chamber, and an inflow pilot valve element that opens and closes the inflow pilot valve hole by an electromagnetic device is provided at an intermediate portion of the inflow pilot flow path. ing.

When gasoline is supplied to the inflow portion with the outflow pilot valve hole open, the back pressure side of the main valve chamber and the outflow portion side are communicated with each other. As a result, the diaphragm main valve body is pressed to the back pressure side, the diaphragm main valve body is deformed to the back pressure side of the main valve chamber, gasoline on the back pressure side of the diaphragm main valve body flows out to the outflow side, and the back pressure side of the main valve chamber. The diaphragm main valve body opens the main valve hole in a state where the hydraulic pressure of the gas has decreased, and gasoline flows out from the inflow side to the outflow side through the main valve hole at a large flow rate.

Then, when the outflow pilot valve hole is closed and the inflow pilot valve hole is opened, the back pressure side of the main valve chamber and the outflow portion side are shut off, and the inflow side communicates with the back pressure side of the main valve chamber. With the gasoline pressure on the back pressure side of the diaphragm main valve body, the diaphragm main valve body presses the main valve hole to the closing side to narrow the main valve hole, and the gasoline flow rate flowing out from the inflow side to the outflow side becomes a small flow rate. When the inflow pilot valve hole is closed in this state, gasoline flows out to the outflow portion side with a small flow rate restricted by the diaphragm main valve body.

Further, when the inflow pilot valve hole is opened in this state, the inflow side communicates with the back pressure side of the diaphragm main valve body in the main valve chamber, and the diaphragm main valve body closes the main valve hole by gasoline pressure. When this state is maintained, the main valve body of the diaphragm closes the main valve hole, and gasoline is prevented from flowing to the outlet.

As described above, opening the outflow pilot valve hole operates the diaphragm main valve body in the opening direction, and opening the inflow pilot valve hole operates the diaphragm main valve body in the closing direction.

Conventionally, a gasoline supply solenoid valve having a structure shown in FIG. 3 is known. The solenoid valve forms a main valve chamber 5 having a main valve hole 4 for communicating an inflow portion 2 and an outflow passage 3 of a valve body 1, and a diaphragm main valve for opening and closing the main valve hole 4 in the main valve chamber 5. A leak hole is formed in the body 6 for communicating the inflow portion 2 side with the back pressure side of the main valve chamber 5, and a small flow passage 7 is formed for communicating the inflow portion 2 side and the outflow portion 3 side. At the same time, a small flow valve hole 8 is formed at an intermediate portion of the small flow passage 7 to form a pilot flow passage 9 for communicating the back pressure side of the main valve chamber 5 with the outflow portion 3 side. A pilot valve hole 10 is formed at an intermediate portion of the pilot valve hole 10 to open and close the small flow valve hole 8 and the pilot valve hole 10.
A structure is provided in which electromagnetic devices 13 and 13 for operating a pilot valve element 12 for opening and closing the valve are respectively provided.

When gasoline is supplied to the inflow section 2 with the pilot valve hole 10 open, the main valve chamber 5
Since the back pressure side and the outflow portion 3 side are communicated by the pilot flow path 9, the spring 14 biases the diaphragm main valve body 6 in a direction to close the diaphragm main valve body 6 by the gasoline hydraulic pressure on the inflow side. Against the back pressure side,
A state in which the diaphragm main valve body 6 is deformed to the back pressure side of the main valve chamber 5, gasoline on the back pressure side of the diaphragm main valve body 6 flows out to the outflow portion 3, and the liquid pressure on the back pressure side of the main valve chamber 5 is reduced. Then, the diaphragm main valve body 6 opens the main valve hole 4, and gasoline flows out from the inflow portion 2 side to the outflow portion 3 side through the main valve hole 4 at a large flow rate.

Next, when the pilot valve hole 10 is closed and the small flow rate valve hole 8 is opened in this state, the back pressure side of the main valve chamber 5 and the outflow portion 3 side are shut off, and the urging force of the spring 14 and the diaphragm main The diaphragm main valve element 6 is connected to the main valve hole 4 by gasoline hydraulic pressure flowing into the back pressure side of the diaphragm main valve element 6 from a leakage small hole that connects the inflow portion 2 side of the valve element 6 and the back pressure side of the main valve chamber 5. Is pressed to the closing side to gradually narrow the main valve hole 4,
The flow rate of gasoline flowing from the inflow section 2 to the outflow section 3 becomes a small flow rate. When the back pressure of the diaphragm main valve body 6 increases, the main valve hole 4 is closed. Also, by opening the small flow valve hole 8,
The inflow portion 2 side and the outflow portion 3 side communicate with each other by the small flow path 7,
The gasoline passes through the small flow path 7 and has a small flow rate,
Spilled to the side.

Further, when the small flow valve hole 8 is closed in this state, the diaphragm main valve body 6 is held in a state where the main valve hole 4 is closed by the hydraulic pressure of gasoline and the urging force of the spring 14.
If this state is maintained, the diaphragm main valve body 6 closes the main valve hole 4 and the outflow of gasoline to the outflow portion 3 is blocked.

In the solenoid valve disclosed in Japanese Patent Application Laid-Open No. 7-63276, an electromagnetic device for operating two pilot valve elements, respectively, and a pilot valve element 12 and a small flow valve element of the electromagnetic valve shown in FIG. The electromagnetic devices that actuate each of the coils 11 are, as shown in FIG.
15, an iron core 16 provided at the center of the coil 15 and excited by energizing the coil 15 and a plunger 17 attracted to the iron core 16;
A pilot valve element 12 and a small flow valve element 11 are provided integrally with each other. Flux plates 18 and 19 are attached to the pair of electromagnetic devices 13. The structure to attach to is adopted.

Further, a case incorporating the electromagnetic device 13
3, a fitting hole 21 communicating with the pilot valve hole 10 and the small flow valve hole 11 is opened on the upper surface of the valve body 1, and a nut 22 is screwed into the fitting hole 21 as shown in FIG. Then, the lower end protruding portion of the guide tube 23 inserted into each coil 15 of the electromagnetic device 13 is screwed and fixed to the nut 22, the core 16 is fixed to the guide tube 23, and the case 20 is fixed to the core 16. Screw the screw 24 inserted from the outside into the case 20
Is attached to the valve body 1.

In the solenoid valve shown in the above-mentioned Japanese Patent Application Laid-Open No. 7-63276 and FIG. 3, the main valve chamber 5 of the valve body 1 is provided.
Is open at one end face facing the back pressure side, so that the diaphragm main valve body 6 can be assembled through this opening, and a cover 25 that closes this opening is attached with bolts 26 to secure the diaphragm main valve body 6. The peripheral part can be held.

[0015]

In the conventional solenoid valve shown in FIG. 3, when mounting the electromagnetic devices 13 and 13, a nut 22 is screwed into each fitting hole 21 in the valve body 1 and each of the nuts 22 is screwed. nut
The guide tubes 23 are respectively screwed into and fixed to 22 and brazed and fixed. In this state, the insulating case substrate 29 is brought into contact with the upper surface of the valve body 1, and the guide tubes 23 are respectively projected from the through holes of the case substrate 29. , A plunger provided with a small flow valve body 11 and a pilot valve body 12 in each guide tube 23
17 are inserted and inserted, and the iron core 16 is inserted into the guide tube 23 with a spring 27 interposed therebetween. Further, the flux plate 19 is superimposed on the case substrate 29 so that the two guide tubes 23 project from the through holes.
To form a pair of electromagnetic devices 13, and both coils 15 are connected by crimp terminals 28.

Further, with the two coils 15 covered by the case 20, a screw 24 is inserted through a through hole of the case 20 to
The electromagnetic devices 13 and 13 are attached to the valve body 1 by tightening to the valve body 16.

As described above, there are many assembling steps for attaching the electromagnetic device to the valve body, which not only takes time and effort to assemble, but also tends to cause forgetting to assemble the flux plate and the like, forgetting to connect the wiring, and lacking water resistance. was there.

Further, since the guide tube is screwed into a nut fixed to the valve body, a nut is required. Also, burrs are generated in the guide tube, and the mounting of the guide tube tends to be uncertain due to the burrs. There is a problem that the attachment to the device becomes unstable.

Further, in the conventional solenoid valve, the cover for closing the opening of the main valve chamber of the valve main body formed for mounting the diaphragm main valve body must be tightened with several bolts, which is difficult to assemble. Not only is it troublesome, but also it is necessary to control the tightening torque of the bolts, resulting in a problem that the number of parts is large and the cost is high.

The present invention has been made in view of the above problems, and a pair of electromagnetic devices can be easily attached to a valve body with a small number of assembling steps, so that assembling is easy and forgetting to incorporate parts may occur. And a gasoline supply solenoid valve capable of reducing the number of assembled parts.

[0021]

According to a first aspect of the present invention, there is provided a gasoline supply solenoid valve having a main valve chamber having an inflow portion, an outflow portion, and a main valve hole communicating the inflow portion and the outflow portion. A small flow path in which the inflow section side communicates with the outflow section side and a small flow valve hole is formed in the middle section, and a pilot valve hole is formed in the middle section by communicating the back pressure side and the outflow section side of the main valve chamber. A main valve body having a pilot flow path, and a main valve body provided with the main valve chamber and having a leakage small hole that opens and closes the main valve hole and communicates the inflow portion side with the back pressure side of the main valve chamber. A small flow valve body for opening and closing the small flow valve hole; and opening and closing the pilot valve hole for opening the pilot valve hole to allow the gasoline flowing from the leakage small hole to the back pressure side of the main valve body to flow into the pilot flow passage. A pilot valve body that flows out to the outflow portion side from the main body, and a main valve hole that connects the main valve body to the pilot valve body. A spring that biases in the closing direction, and a pair of electromagnetic devices that advance and retreat each plunger that opens and closes the small flow valve body and the pilot valve body, respectively, wherein both coils of the pair of electromagnetic devices are made of synthetic resin. The coil body integrated by molding is attached to the valve body.

When gasoline is supplied to the inflow portion with the pilot valve hole open, the back pressure side and the outflow portion side of the main valve chamber communicate with each other through a pilot flow path.
The main valve body is pressed to the back pressure side by the gasoline fluid pressure on the inflow side, the main valve body moves to the back pressure side of the main valve chamber, and the gasoline on the back pressure side of the main valve body flows out to the outflow portion side, and the main valve chamber The main valve body opens the main valve hole in a state where the liquid pressure on the back pressure side is reduced, and gasoline flows out from the inflow portion side to the outflow portion side at a large flow rate through the main valve hole.

When the pilot valve hole is closed and the small flow valve hole is opened in this state, the back pressure side and the outflow side of the main valve chamber are shut off, and the inflow side of the main valve body and the back pressure side of the main valve chamber. With the gasoline pressure flowing into the back pressure side of the diaphragm main valve body from the leakage small hole that communicates with the main valve body, the main valve body is pressed to the closing side of the main valve hole, gradually narrows the main valve hole, and the outflow portion from the inflow portion side The flow rate of gasoline flowing to the side becomes small, and when the back pressure of the main valve body increases, the main valve hole is closed. When the small flow valve hole is opened, the inflow portion and the outflow portion communicate with each other through the small flow channel, and the gasoline flows through the small flow channel into a small flow and flows out to the outflow portion.

Further, when the small flow valve hole is closed in this state, the main valve body is kept closed by the gasoline pressure, the main valve body closes the main valve hole, and gasoline flows out. Outflow to the section is blocked.

Further, both coils of a pair of electromagnetic devices for moving the plungers for opening and closing the small flow valve body and the pilot valve body to open and close, respectively, are molded with synthetic resin to form an integrated coil body in the valve body. As a result, assembly is easy, the connection of each coil is not forgotten, and the number of assembly steps can be reduced.

According to a second aspect of the present invention, there is provided a gasoline supply solenoid valve according to the first aspect.
The coil body is formed by integrally molding a flux plate in contact with the upper and lower surfaces of each coil.

In assembling the electromagnetic device, the number of parts to be assembled can be reduced without forgetting to assemble the flux plate.

According to a third aspect of the present invention, there is provided a gasoline supply solenoid valve according to the first or second aspect, wherein the solenoid valve is fitted to a center portion of each coil of the coil body, and is inserted from a lower end of the coil body. A pair of guide tubes each having an annular locking portion formed on the outer periphery of the projecting portion, an iron core attached to each of the two guide tubes and excited by energizing each of the coils, and fitted to the two guide tubes so as to be able to move forward and backward respectively. A pair of plungers which are inserted and attracted by the excitation of the core to open and close the pilot valve element and the small flow valve element; and a pair of screws for fixing the respective iron cores to the coil body, respectively, and face the upper surface of the valve body. The fitting hole having an annular groove formed in the inner peripheral surface communicating with the small flow valve hole and the pilot valve hole is opened, and a substantially C-shaped stopper is formed in the annular groove formed in the inner peripheral surface of the fitting hole. A stop ring engaged with the annular groove of the fitting hole at the lower end locking portion of both guide tubes protruding from the lower surface of the coil body fitted into the fitting hole of the valve body. Is locked.

Then, an iron core is fitted and fixed in a fitting hole of the valve body, and a guide tube in which a plunger provided with a small flow valve body and a pilot valve body is fitted in a guide tube is fitted. By engaging a substantially C-shaped stop ring fitted on the outer circumference with an annular groove formed on the inner circumferential surface of the fitting hole of the valve body, the stop ring is locked on a locking portion formed on the lower end of the guide tube. The guide tube is attached to the valve body.

Next, the two guide tubes are fitted to each coil of the coil body to form a pair of electromagnetic devices, and the electromagnetic device is mounted on the valve body by inserting screws into the coil body and tightening the core.

According to a fourth aspect of the present invention, there is provided a gasoline supply solenoid valve according to any one of the first to third aspects, wherein a main valve chamber formed in the valve body is provided at one end surface of the valve body. A cover that closes the opening of the main valve chamber that is opened at one end face of the valve body while holding the peripheral edge of the main valve body formed by a diaphragm at the periphery of the main valve hole of the main valve chamber. The cover is fitted and retained by a retaining ring engaged with an annular groove formed on the inner peripheral surface on the opening edge side of the main valve chamber.

By fitting a cover into the opening of the main valve chamber, which is opened in the main valve hole, the peripheral edge of the main valve body formed by the diaphragm is pressed and held, and the opening of the main valve chamber of the valve body is opened. The part is closed. In this state, the cover is retained and retained by engaging the retaining ring with the annular groove formed on the inner peripheral surface on the opening edge side of the main valve chamber.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a gasoline supply solenoid valve according to the present invention will be described with reference to FIGS.

In FIGS. 1 and 2, reference numeral 30 denotes a valve body formed by die-casting of aluminum or the like. The valve body 30 has a main valve chamber 31 opened at one end face. An annular protruding edge 33 that forms a main valve hole 32 from an inner end to a front end edge protrudes toward an opening 34 of the main valve chamber 31. In addition, the inner peripheral surface of the main valve chamber 31 is enlarged by a diameter increasing step 35 formed on the inner peripheral surface at a position closer to the opening 34 than the main valve hole 32. The inner peripheral surface on the opening 34 side was expanded at the outer diameter expanding step 36 formed between the inner diameter expanding step 35 and the opening 34, and the diameter was expanded at the outer diameter expanding step 36. An annular groove 36a is formed on the inner peripheral surface.

An inflow portion 37 is opened in the outer peripheral surface of the valve main body 30 so as to face the outer peripheral side of the annular protruding edge 33 of the main valve chamber 31. An outflow portion 38 that is open at the other end surface of the main body 30 is formed.

Further, the valve body 31 has a small flow path communicating with the inflow portion 37 from the outer peripheral side of the annular protruding edge 33 of the main valve chamber 31.
A small flow passage 40b communicating with the outflow passage 38 is formed, and a small flow valve hole 41 is formed in a communicating portion between the small flow passages 40a and 40b.

In the valve body 30, a main valve hole of a main valve chamber 31 is provided.
Pilot flow path 42 communicating with back pressure side of opening 34 side from 32
a and a pilot flow passage 42b communicating with the outflow portion 38 side, and a pilot valve hole 43 is formed in a communication portion which is an intermediate portion between the pilot flow passages 42a and 42b.

A part of the small flow path 40a and a part of the pilot flow path 42a are linear portions 40c parallel to the upper surface of the valve body 30,
The straight portions 40c, 42c open from one end face of the valve body 30, and the openings at the one end face are closed spheres 40d, 42d.
Close with.

As shown in FIG. 2, fitting holes 44 facing the upper surface of the valve main body 30 and communicating with the small flow valve holes 41 and the pilot valve holes 43, respectively, are provided with the small flow valve holes 41, respectively.
And the pilot valve hole 43 are centered and opened. An annular concave groove 46 is formed on the inner end surface of each fitting hole 44 at the outer periphery of the small flow valve hole 41 and the pilot valve hole 43 to fit the O-ring 45. An annular groove 47 is formed on the inner peripheral surface of the fitting hole 44, and the opening side of the fitting hole 44 is enlarged in diameter.

Next, in FIG. 1, reference numeral 50 designates a main valve body formed of a diaphragm. The main valve body 50 is brought into contact with and separated from the tip of the annular protruding edge 33 serving as a valve seat so that the main valve hole 32 is formed. Open and close. The main valve body 50 is configured such that its peripheral edge is in contact with the enlarged diameter step portion 35 of the main valve chamber 31 and is fixed. The main valve body 50 has an inflow portion 37 on the outer peripheral side of the annular protruding edge 33 and the main valve chamber 31.
A small leak hole 51 communicating with the back pressure side is formed.

A main valve guide 53 is attached to a center hole 52 formed in the center of the main valve 50. The main valve body guide 53 is provided with a plurality of guide protrusions 54 that slide along the inner peripheral surface of the annular protrusion 33 protruding from the main valve chamber 31 of the valve body 30. The main valve body guide 53 has the main valve body.
An annular contact plate portion 55 is formed on the back pressure side of the main valve body 50 so that the main valve body 50 abuts against the tip of the annular protruding edge 33 serving as a valve seat to keep the main valve hole 32 closed. A leakage small hole 56 communicating with the leakage small hole 51 of the main valve body 50 is formed on the main valve body 50, and an engagement groove engaged with the center hole 52 of the main valve body 50 is formed on an inner peripheral edge of the contact plate portion 55. 57 are formed. Further, the main valve body guide 53
A sliding guide portion 58 is formed on the periphery of the contact plate portion 55,
A spring receiving recess 59 is formed in the center portion on the back pressure side of the main valve body guide 53.

Further, in FIG. 1, reference numeral 60 denotes the valve body 30.
The main valve body guide is provided on the inner surface side of the cover 60 with a cover for closing the opening 34 of the main valve chamber 31.
A fitting cylinder portion 61 for fitting the sliding guide portion 58 of 53 is formed, and at the tip of the fitting cylinder portion 61, the inner diameter expanding step portion 35 of the main valve chamber 31 is formed.
An inner fitting edge 62 that fits along the inner peripheral surface of which the diameter is enlarged is formed. Further, an outer fitting edge 63 that fits on the inner peripheral surface of the main valve chamber 31 whose diameter is increased by the outer diameter increasing step 36 is formed on the peripheral edge of the cover 60. Further, a spring fitting portion 64 is formed to bulge at the center of the cover 60. The main valve chamber 31 is provided in the fitting cylindrical portion 61 of the cover 60.
A communication small hole 65 is formed to allow the back pressure side of the main valve body 50 to communicate with the pilot flow path 42a.

The spring receiving recess 59 of the main valve body guide 53 and the spring receiving recess 59 of the cover 60
The main valve body is engaged with the fitting cylindrical portion 61 of this cover 60 by engaging both ends of 69.
The central guide hole 52 of the main body 50 is engaged with the sliding guide portion 58 of the main valve body guide body 53 engaged with the engagement groove 57, and the cover 60 is expanded at the inner diameter increasing step 35 of the main valve chamber 31. The outer fitting edge 63 of the cover 60 is fitted to the inner circumferential surface of the main valve chamber 31 whose diameter has been increased by the outer diameter-increased stepped portion 36 so that the main valve body is fitted. The periphery of 50 is sandwiched and fixed between the inner enlarged step 35 and the inner surface of the inner fitting edge 62. Also,
An annular packing 66 is brought into contact with the outer peripheral edge of the cover 60, and the cover 60 is retained and retained by a C-shaped retaining ring 67 engaged with an annular groove 36a formed in the main valve chamber 31 of the valve body 30.

Next, a pair of electromagnetic devices 72 and 73 for operating a small flow valve 71 for opening and closing the small flow valve hole 41 and a pilot valve 70 for opening and closing the pilot valve hole 43 shown in FIG.
Will be described.

Each of the electromagnetic devices 72 and 73 includes a coil 75 wound around a coil bobbin 74, an iron core 76 excited by energizing the coil 75, a plunger 77 attracted by the excitation of the iron core 76, and the coil 75. The small flow rate valve body 71 and the pilot valve body 70 are attached to the plungers 77, respectively.

Then, both coils of each of the electromagnetic devices 72 and 73
A coil body 80 is formed by connecting the wires 75 together with a flux plate 78 and integrally molding the same with a heat-resistant synthetic resin such as an epoxy resin. And this coil body
A central hole of a coil bobbin 74 around which each coil 75 is wound is opened on the lower surface of 80.

Further, as shown in FIG.
The guide tube 81 fitted into the center hole of each coil 75 has an annular locking portion 83 formed on the outer periphery of a protruding portion from the lower end of the coil body 80. These two guide tubes 81
The core 76 fitted into the plunger is fixed to an upper portion of the guide tube 81, and the guide tube 81 is provided with a spring 84 below the core 76, with the plunger interposed therebetween.
Each plunger 77 is biased downward by a spring 84 so that the pilot valve body 70 and the small flow valve body 71 close the pilot valve hole 43 and the small flow valve hole 41. Both plungers 77 are each iron core
The pilot valve element 70 and the small flow valve element 71 are attracted by the excitation of 76 to open the pilot valve hole 43 and the small flow valve hole 41.

Each of the iron cores 76 is provided with a coil body 80.
The screw 85 inserted from the upper surface of the is fixed by being screwed.

The fitting hole 44 of the valve body 30 is formed by a substantially C-shaped stop ring 86 engaged with an annular groove 47 formed on the inner peripheral surface of the fitting hole 44 opened on the upper surface of the valve body 30. The locking portions 83 formed on the lower end protruding portions of the two guide tubes 81 fitted to the guide tubes 81 are locked.

Next, the operation of this embodiment will be described.

When the pilot valve hole 43 and the small flow valve hole 41 are closed by the pilot valve body 70 and the small flow valve valve 71, gasoline supplied from the inflow portion 37 receives the small leak hole 51 of the main valve body 50. And the main valve body 50 through the leakage small hole 56 of the main valve body guide body 53
The main valve body 30 closes the main valve hole 32 by the hydraulic pressure from the back pressure side and the urging force of the spring 69, and gasoline does not flow out.

In this state, when the iron core 76 is excited by energizing the coil 75 of the electromagnetic device 73, the plunger 77 is attracted and the pilot valve body 70 opens the pilot valve hole 43. And the outflow section 38 side are connected to the pilot flow paths 42a and 42
b is communicated, the main valve body 50 is pressed to the back pressure side by the liquid pressure of the gasoline supplied to the inflow portion 37, and the main valve body 50 is moved to the main valve chamber 31.
The gasoline on the back pressure side of the main valve body 50 flows out to the outflow portion 38 side, and the liquid pressure on the back pressure side of the main valve chamber 31 is reduced. Open the gasoline main valve hole 32
After that, it flows out at a large flow rate from the inflow portion 37 side to the outflow portion 38 side.

In this state, when energization of the coil 75 of the electromagnetic device 73 for operating the pilot valve element 70 is cut off, the plunger 77 is urged by the spring 84 to close the pilot valve hole 43 and operate the small flow valve element 71. When the electromagnetic device 72 is energized, the plunger 77 is attracted by the excitation of the iron core 76 by the coil 75, the small flow valve body 71 opens the small flow valve hole 41, and the back pressure side of the main valve chamber 31 and the outflow portion 38 side are connected. It is shut off and the inflow part 37 of the main valve body 50
Small hole 51, which connects the pressure side to the back pressure side of the main valve chamber 31,
The main valve body 50 is pressed in a direction to close the main valve hole 32 by the liquid pressure of gasoline flowing into the back pressure side of the main valve body 50 from the
And the flow rate of gasoline flowing from the inflow portion 37 side to the outflow portion 38 side becomes a small flow rate. When the back pressure of the main valve body 50 increases, the main valve hole 32 is closed. When the small flow valve hole 41 is opened, the inflow portion 37 and the outflow portion 38 are formed by the small flow passages 40a and 40b.
The gasoline flows through the small flow paths 40a and 40b and flows out to the outflow section 38 at a small flow rate.

Further, in this state, when the energization to the coil 75 of the electromagnetic device 72 for operating the small flow valve body 71 is cut off, the plunger 77 is urged by the spring 84 and the pilot valve hole 43 is opened.
Is closed and the small flow valve hole 41 is closed, the main valve body 50 is held in a state where the main valve hole 32 is closed by the gasoline pressure, and the main valve body is closed.
50 closes the main valve hole 32, and gasoline is prevented from flowing out to the outlet 38.

When the coils 75 of the electromagnetic devices 72 and 73 are energized, the pilot valve body 70 and the small flow valve body 71 open the pilot valve hole 43 and the small flow valve hole 41, and gasoline is supplied to the main valve hole.
32 and the small flow channels 40a, 40b.

Further, both coils 75 of a pair of electromagnetic devices 72 and 73 for opening and closing the plungers 77 for opening and closing the small flow valve body 71 and the pilot valve body 70, respectively, are integrally molded by synthetic resin. When attaching the coil body 80 to the valve body 30, the annular groove 46 formed in the fitting hole 44 of the valve body 30 is used.
An O-ring 45 is fitted into the fitting hole 44 of the valve body 30, a core 76 is fitted and fixed, and a spring 84 is fitted from below to fit a guide tube 81 into which a plunger 77 is fitted. A substantially C-shaped retaining ring 86 fitted to the guide tube 81
Engages with the annular groove 47 formed on the inner peripheral surface of the fitting hole 44 of the valve body 30 so that the retaining ring 86 is locked by the locking portion 83 formed at the lower end of the guide tube 81, and the guide tube 81
Is attached to the valve body 30 in a liquid-tight manner by an O-ring 45.

In this state, each coil 75 of the coil body 80 is fitted to both guide tubes 81 to form a pair of electromagnetic devices 72 and 73, and a screw 85 is inserted through the coil body 80 and fastened to the iron core 76. The electromagnetic devices 72 and 73 are constituted by
Mounted on 30.

In repair and inspection, the electromagnetic device 72,
When the valve body 30 removes 73, the coil body 80 can be separated from the valve body 30 by removing the screw 85 from the iron core 76,
An annular groove 47 in which a retaining ring 86 is formed in the fitting hole 44 of the valve body 30
The guide tube 81 is pulled out, the plunger 77 is removed from the guide tube 81, and the small flow valve body 71 is removed.
And the pilot valve body 70 can be inspected. In this state, the fitting hole 44 is opened, and the pilot valve hole 43 and the small flow valve hole are opened.
You can check 41.

In order to close the opening 34 opened in the main valve hole 32 of the main valve chamber 31 of the valve main body 30, the periphery of the main valve body 50 formed by a diaphragm is formed by fitting a cover 60. It is pressed and held, and the opening 34 of the main valve chamber 31 of the valve body 30 is closed. In this state, the cover 60 is retained and retained by engaging the retaining ring 67 with the annular groove 36a formed on the inner peripheral surface on the opening edge side of the main valve chamber.

In repair and inspection, the cover 60 is removed by removing the retaining ring 67 engaged with the annular groove 36a of the valve body 30, the main valve body 50 is removed, and the main valve body 5 is removed.
0, the main valve hole 32 can be inspected.

[0061]

According to the present invention, the pilot valve element and the small flow valve element are opened and closed by a pair of electromagnetic devices, so that the main valve element opens and closes the main valve hole or opens and closes the small flow valve hole. In the gasoline supply solenoid valve capable of allowing gasoline to flow out of the main valve hole at a large flow rate or gasoline to flow out of the small flow rate valve hole at a small flow rate, each of the small flow rate valve element and the pilot valve element is opened and closed. The two coils of a pair of electromagnetic devices that move the plunger forward and backward are molded with synthetic resin, and the integrated coil body is attached to the valve body.Assembling is easy, and there is no forgetting to connect each coil. Can be reduced.

Further, by integrally molding a flux plate in contact with the upper and lower surfaces of each coil on the coil body, the number of parts to be assembled can be reduced without forgetting to assemble the flux plate when assembling the electromagnetic device.

Further, an iron core is fitted and fixed in a fitting hole of the valve body, and a guide tube in which a plunger provided with a small flow valve body and a pilot valve body is fitted in a guide tube, respectively, is fitted. Fitted approximately C
By engaging the V-shaped stop ring with the annular groove formed on the inner peripheral surface of the fitting hole of the valve body, the stop ring is locked by the locking portion formed at the lower end of the guide tube, and the guide tube is The electromagnetic device is attached to the valve body by attaching both guide tubes to each coil of the coil body, and forming a pair of electromagnetic devices by inserting screws into the coil body and tightening them to the iron core. The electromagnetic device can be easily assembled to the valve body and removed from the valve body.

Further, by fitting a cover into an opening formed in the main valve hole of the main valve chamber, the peripheral edge of the main valve body formed by the diaphragm is pressed and held so that the opening of the main valve chamber of the valve main body is closed. The cover can be closed, and the cover can be easily prevented from falling off and retained by engaging the retaining ring with the annular groove formed on the inner peripheral surface on the opening edge side of the main valve chamber.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a gasoline supply solenoid valve according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional front view of the pilot valve body.

FIG. 3 is a vertical sectional front view of a conventional gasoline supply solenoid valve.

[Explanation of symbols]

 30 Valve body 31 Main valve chamber 32 Main valve hole 34 Main valve chamber opening 36a Annular groove 37 Inlet 38 Outlet 40a, 40b Small flow passage 41 Small flow valve hole 42a, 42b Pilot passage 43 Pilot valve hole 44 Mating hole 47 Annular groove 50 Main valve body 51 Leak small hole 60 Cover 67 Stop ring 69 Spring 70 Pilot valve body 71 Small flow valve body 72, 73 Electromagnetic device 75 Coil 76 Iron core 77 Plunger 78 Flux plate 80 Coil body 81 Guide tube 83 Locking part 85 Screw 86 Retaining ring

Claims (4)

[Claims] 1. A main valve chamber having an inflow portion, an outflow portion, a main valve hole communicating the inflow portion and the outflow portion, a small flow valve hole communicating between the inflow portion side and the outflow portion side and an intermediate portion. And a valve body having a pilot flow path in which a back pressure side and an outflow part side of the main valve chamber communicate with each other and a pilot valve hole is formed in an intermediate part, and the main body is provided in the main valve chamber. A main valve body that opens and closes a main valve hole and forms a leakage small hole that communicates an inflow portion side with a back pressure side of the main valve chamber; a small flow valve body that opens and closes the small flow valve hole; and the pilot valve A pilot valve element that opens and closes a hole, and opens the pilot valve hole to allow the gasoline flowing from the leakage small hole to flow to the back pressure side of the main valve element and to flow out from the pilot flow path to the outflow part side; A spring for biasing the valve hole in a direction to close the valve hole; A pair of electromagnetic devices that advance and retreat each plunger that opens and closes the lot valve element, respectively. The coil body formed by molding both coils of the pair of electromagnetic devices with synthetic resin is integrated into the valve body. Solenoid valve for gasoline supply characterized by wearing. 2. The gasoline supply solenoid valve according to claim 1, wherein a flux plate in contact with the upper and lower surfaces of each coil is integrally molded with the coil body. 3. A pair of guide tubes each fitted into the center of each coil of the coil body and having an annular locking portion formed on the outer periphery of a protruding portion from the lower end of the coil body, and mounted on both of the guide tubes. A pair of plungers that are inserted into the two guide tubes so as to be able to move forward and backward and are attracted by the excitation of the cores to open and close the pilot valve element and the small flow rate valve element. A pair of screws for fixing the respective iron cores to the coil body, and opening a fitting hole facing the upper surface of the valve body and communicating with the small flow valve hole and the pilot valve hole and forming an annular groove on the inner peripheral surface. A substantially C-shaped stop ring is engaged with an annular groove formed on the inner peripheral surface of the fitting hole, and the two projecting from the lower surfaces of the coil bodies respectively fitted into the fitting holes of the valve body. guide 3. The gasoline supply solenoid valve according to claim 1, wherein a stop ring engaged with the annular groove of the fitting hole is locked to a lower end locking portion of the tube. 4. A main valve chamber formed in a valve main body is opened at one end face of the valve main body, and a peripheral edge of a main valve body formed by a diaphragm is pressed and held around a peripheral edge of a main valve hole of the main valve chamber. A cover for closing the opening of the main valve chamber opened at one end face of the valve body, and the cover is engaged with an annular groove formed on the inner peripheral surface on the opening edge side of the main valve chamber. 4. The gasoline supply solenoid valve according to claim 1, wherein the gasoline supply solenoid valve is retained by a ring.