JPH1182225A - Manufacture of solenoid valve and fuel feeder used therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembling operations without entailing any drop in the rigidity of a stopper plate as well as imparting any hindrance to a fluid flow. SOLUTION: An opening 53 of a fluid passage being communicates with a valve hole is formed on a peripheral surface of a valve body 8 to be locked to a fixed iron core 2, and this opening 53 is surroundedly covered by a filter to be clamped to the fixed iron core 2 or the valve body 8. In this constitution, such a structure that a stopper plate 700 is held by this filter 9 is adopted in particular. If doing suchlike, a problem of positional dislocation of this stopper plate is resolvable without incurring any structural complication and an increment in the number of part items.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a solenoid valve and a method for manufacturing a fuel supply device using the same.

[0002]

2. Description of the Related Art FIG. 4 shows the structure of a conventional fuel supply device (also referred to as a high-pressure supply pump), and FIG. 100 is a cylinder, 200 is a check valve (delivery valve), 300 is a fuel intake cylinder, 400 is a plunger, 500 is a tappet that moves up and down by a cam (not shown), 600 is a spring that presses the tappet 500 against a cam (not shown), 700 is a stopper plate, V is a solenoid valve.

The solenoid valve V is screwed into the solenoid valve mounting hole 101 of the cylinder 100 until the lower end surface of the large diameter portion 51 of the needle 5 comes into contact with the stopper plate 700.
Reference numeral 9a denotes a resin filter whose upper end is pressed against the lower end of the core 2 and surrounds the outer periphery of the valve body 8, and has a wire mesh filter inlet 91 facing the fuel inlet hole 82. . The stopper plate 700 connects the fuel passage 53 between the inner peripheral surface of the distal end portion of the valve body 8 and the outer peripheral surface of the large-diameter portion 51 of the needle 5 to the pump chamber formed by the upper space of the bore 102 of the cylinder 100. Communication hole 701. The upper surface of the stopper plate 700 is in close contact with the ring-shaped tip of the valve body 8 surrounding the valve seat surface 83 so as to be sealable, and the lower surface of the stopper plate 700 is a stopper plate receiver formed at the bottom of the solenoid valve mounting hole 101. It is in close contact with the surface 103 so that it can be sealed.

Therefore, in assembling the electromagnetic valve V to the fuel supply device, first, the stopper plate 700 is inserted into the electromagnetic valve mounting hole 101, and then the electromagnetic valve V is screwed.

[0005]

However, the above-mentioned conventional fuel supply device has the following disadvantages. First, when the stopper plate 700 is inserted into the stopper plate receiving surface 103 and the stopper plate receiving surface 103 is displaced with respect to the axis, the communication hole 701 of the stopper plate 700 is moved to the inner periphery of the distal end of the valve body 8. The fuel passage 53 is shifted in the radial direction with respect to the fuel passage 53 between the surface and the outer peripheral surface of the large-diameter portion 51 of the needle 5, and the fluid resistance in this portion increases, which hinders the supply of fuel to the pump chamber. I will. When the communication hole 701 of the stopper plate 700 is widened, the needle 5 repeatedly collides with the stopper plate 700, so that the rigidity of the stopper plate 700 is reduced, and the stroke of the needle 5 due to the deformation is reduced. Will change.
Further, in the assembling work, a thin stopper plate 7
Setting 00 at a predetermined position (ie, a position coaxial with the axis) at the bottom of the small-diameter solenoid valve mounting hole 101 is not simple and requires a high-precision precision operation.

[0006] The present invention has been made in view of the above problems, and without reducing the rigidity of the stopper plate,
Further, it is an object of the present invention to provide a solenoid valve capable of facilitating an assembling operation without obstructing a fluid flow and a method of manufacturing a fuel supply device using the same.

[0007]

According to the first aspect of the present invention, an opening of a fluid passage communicating with the valve hole is formed on an outer peripheral surface of the valve body fixed to the fixed iron core. , And is enclosed by a fixed iron core or a filter fixed to the valve body. The present invention particularly adopts a configuration in which the stopper plate is held by the filter.

In this way, the displacement of the stopper plate can be eliminated without complicating the structure and increasing the number of parts. More specifically, the stopper plate is not separated from the solenoid valve, but is held by a filter so as to be integrated with the solenoid valve and assembled to a solenoid valve assembly member such as a fuel supply device. When the stopper plate is held by the filter before this assembling, it is easy to set the stopper plate at a predetermined position (particularly in a radial direction) of the filter, and the filter is fixed at a predetermined position of the fixed iron core of the solenoid valve or the valve body ( (Especially, in the radial direction), it is easy to set the stopper plate and the solenoid valve in the radial direction. Therefore, it is not necessary to increase the width of the communication hole of the stopper plate, and the deformation of the stopper plate due to the abutment of the valve body can be suppressed.

According to a second aspect of the present invention, in the method for manufacturing a fuel supply device using the solenoid valve according to the first aspect, after the stopper plate is press-fitted into the filter, the solenoid valve is assembled to the housing, and the valve seat surface is formed. The stopper plate is sandwiched between the ring-shaped tip of the surrounding valve body and the stopper plate receiving surface of the housing. With this configuration, the valve clearance can be set with high accuracy by the valve body through the stopper plate, and the sealing of liquid leakage along both surfaces of the stopper plate becomes easy. Further, since the stopper plate is press-fitted into, for example, a resin filter, it is possible to easily hold the stopper plate by the filter.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The stopper plate is preferably a metal plate with holes, and the filter is preferably a resin molded product, but is not limited thereto. It is preferable that the stopper plate and the filter are formed separately and integrated by press fitting or the like in terms of shortening the manufacturing process. However, both may be formed as an integrated product of the same material, or may be formed as an integrated product by insert molding or the like.

Although it is preferable that the movable iron core and the valve body are made of different materials in view of the required material specifications, it is also possible to form an integral product of the same material. Preferred embodiments of the present invention will be described with reference to the following examples. (Example) Structure of fuel supply device The structure of a fuel supply device (also referred to as a high-pressure supply pump) of this embodiment is shown in FIG.

100 is a cylinder (housing), 200
Is a check valve, 300 is a fuel intake cylinder, 400 is a plunger, 500 is a tappet, 600 is a spring, 700 is a stopper plate, 800 is a solenoid valve, and 900 is a guide cylinder. The cylinder 100 has a bore 102 whose upper end opening communicates with the solenoid valve mounting hole 101 and in which the plunger 400 reciprocates slidably. A check valve mounting hole 104 and a fuel suction cylinder mounting hole 105 are provided on the upper side of the cylinder 100 on both sides of the solenoid valve mounting hole 101, and a check valve 200 and a fuel suction cylinder 30 are provided therein.
0 is screwed. The upper end opening of the bore 102 is a solenoid valve 8
00, the upper part of the bore 102 communicates with the check valve 200 through the check valve communication hole 106,
The central portion of the bore 102 communicates with the fuel intake cylinder 300 through the fuel intake cylinder communication hole 107. Further, the cylinder 10
A passage 108 communicating the fuel suction cylinder 300 and the suction port of the solenoid valve 800 is formed at 0.

The plunger 400 is driven by a cam (not shown) via a tappet 500 to move up and down in the bore 102. Spring 600 cams tappet 500 to cam 700
Is pressed. Reference numeral 900 denotes a guide cylinder fixed to the cylinder 100 to guide the tappet 500 up and down. The space remaining above the plunger 400 in the bore 102 communicates with the mounting holes 104 and 105 and the plunger 400
The pump chamber P performs the suction of fuel through the electromagnetic valve 800 and the delivery of pressurized fuel through the check valve 200 by reciprocation. The fuel suction cylinder communication hole 107 is formed below the pump chamber P, and reduces the bore internal pressure to the pressure of the fuel suction cylinder 300 at this position (recovers fuel oil to the fuel suction cylinder 3). Then, it has a function of preventing the lubricant from entering the lubricating oil in the guide cylinder 900.

Structure of Solenoid Valve 800 The structure of the solenoid valve 800 will be described with reference to FIG. The cores 1 and 2 constitute a fixed core, and the disk portion 11 of the core 1
The upper end opening edge of the cylindrical core 2 is caulked around the outer periphery of the coil assembly 3. The core 1 has a shaft portion 12 protruding downward from a central portion thereof, and a gap G is formed between the shaft portion 12 and a lower end portion of the core 2. A movable iron core sliding hole 21 is formed inside the lower end of the core 2 so that the movable core 4 is slidably held in the axial direction. A needle 5 is inserted into a lower end opening of the movable core 4. Have been welded.

The coil assembly 3 is formed by winding a coil 32 around a spool 31 fitted on the shaft portion 12, and further covering a resin coating portion 33 on the outer periphery thereof. Reference numeral 6 denotes a resin mold having a connector 61, which is attached by insert molding to an upper end surface of a stationary magnetic circuit assembly including the cores 1, 2 and the coil assembly 3, and a terminal of the coil 32 is connected to a terminal 62 in the connector 61. It is connected.

Reference numeral 7 denotes a return spring whose upper end is locked to the lower end surface of the shaft portion 12 of the core 1 and whose lower end urges the movable core 4 downward. Recess 22 formed at the lower end of core 2
The valve body 8 is press-fitted and fixed by caulking, and the needle 5 is held in a valve hole 81 formed through the center of the valve body 8 so as to be slidable in the axial direction. The valve body 8 has a plurality of fuel inflow holes 82 radially communicating the outer periphery thereof and the valve hole, and a valve seat surface 83 formed around the outer periphery of the lower end opening of the valve hole 81. Reference numeral 83 faces the annular plate-shaped valve seat contact surface 52 of the large-diameter portion 51 formed at the lower end of the needle 5 so as to be able to contact the same.

Reference numeral 9 denotes a cylindrical resin filter which has an upper end portion pressed against the lower end portion of the core 2 and surrounds the outer periphery of the valve body 8 and is formed of resin. And a wire mesh-shaped filtration inlet 91. A disc-shaped stopper plate 700 with a hole is press-fitted into the lower end of the filter 9, and the communication hole 701 of the stopper plate 700 has an inner peripheral surface at the distal end of the valve body 8 and a large diameter portion of the needle 5. A communication hole 701 for communicating the fuel passage 53 with the outer peripheral surface of the pump chamber P formed in the upper space in the bore 102 of the cylinder 100 is provided. The upper surface of the stopper plate 700 is in close contact with the ring-shaped tip (lower end) of the valve body 8 surrounding the valve seat surface 83 so as to be sealable, and the lower surface of the stopper plate 700 is formed at the bottom of the solenoid valve mounting hole 101. Stopper plate receiving surface 1
03 is close to the sealable. Stopper plate 7
00 is in close contact with the ring-shaped tip of the valve body 8, and the lower end of the large diameter portion 51 of the needle 5 is pressed against the upper surface of the stopper plate 700 by the bias of the return spring 7. Therefore, the maximum value of the valve clearance between the valve seat surface 83 of the valve body 8 and the valve seat contact surface 52 of the large diameter portion 51 of the needle 5 is determined through the stopper plate 700. It is defined by a ring-shaped tip. Reference numerals 23 and 84 denote communication passages provided in the core 2 and the valve body 8 to communicate the fuel inflow hole 82 with the movable core 4 housing space S.

Operation of Solenoid Valve 800 The operation of the solenoid valve 800 of this embodiment will be described below. When the coil 32 is energized, the movable core 4 rises together with the needle 5 in order to eliminate the magnetic gap, the valve seat contact surface 52 of the needle 5 contacts the valve seat surface 83 of the valve body 8 and the electromagnetic force is transmitted from the bore 102. Fuel loss through the valve V is shut off. When the energization of the coil 32 is cut off, the above-mentioned electromagnetic force is extinguished, the return spring 7 lowers the movable core 4 and the needle 5, and the valve seat contact surface 52 of the needle 5 is moved to the valve body 8 Away from the valve seat surface 83 of the bore 10
Communication between the fuel tank 2 and the fuel suction cylinder 300 is restarted.

Hereinafter, the assembly of the solenoid valve 800 will be described. The cores 1 and 2 are assembled to the coil assembly 3, the upper end opening edge of the cylindrical core 2 is caulked on the outer peripheral edge of the disk portion 11 of the core 1, and a resin mold 6 is formed by insert molding to form a stationary magnetic circuit Form an assembly.
Next, the valve body 8 is fitted into the concave portion 22 formed at the lower end of the core 2 and the outer peripheral edge of the lower end of the core 2 is swaged to fix them. The insert molding may be performed after the valve body 8 is fixed to the core 2. Next, the base end of the needle 5 is inserted into the opening at the distal end of the movable core 4 and the entire periphery thereof is welded to integrate the two. Next, the movable portion formed by integrating the movable core 4 and the needle 5 is inserted into the valve hole 81 and the movable iron core sliding hole 21 to complete the assembly. The return spring 7 is provided at a suitable stage before assembling the movable part. Next, after press-fitting the stopper plate 700 into the filter 9, the filter 9 is crimped to the core 2.

Description of Operation of Fuel Supply Apparatus In the fuel intake stroke, tappet 500 and plunger 400
Falls, the fuel flows from the fuel intake cylinder 300 to the passage 10.
8. When the tappet 500 and the plunger 400 are lifted in the fuel compression stroke through the passages 82 and 53 inside the solenoid valve V and the communication hole 701 of the stopper plate 700 into the pump chamber P which is the upper space of the bore 102, When the fuel amount in the pump chamber P reaches a predetermined amount, the solenoid valve 800 is shut off, the fuel pressure in the pump chamber P increases, and when the fuel pressure exceeds a certain pressure, the check valve 200 opens to supply fuel. Is done.

Effects of the Embodiment The communicating hole 701 of the stopper plate 700 and the fuel passage 53 between the inner peripheral surface of the distal end portion of the valve body 8 and the outer peripheral surface of the large diameter portion 51 of the needle 5 are formed in the radial direction. Since it is possible to easily prevent the stopper plate 700 from slipping, the communication hole 701 of the stopper plate 700 is enlarged to reduce its rigidity,
The bending of the valve 700 does not change the stroke of the needle 5, does not increase the fluid resistance and hinders the fuel supply to the pump chamber P, and the assembly operation is simplified. Can be realized.

[Brief description of the drawings]

FIG. 1 is an axial sectional view showing one embodiment of a fuel supply device of the present invention.

FIG. 2 is an enlarged partial sectional view of a main part of the fuel supply device of FIG.

FIG. 3 is an axial sectional view of the solenoid valve 800 of FIG.

FIG. 4 is an axial sectional view of a conventional fuel supply device.

FIG. 5 is an enlarged partial sectional view of a main part of the fuel supply device of FIG. 4;

[Explanation of symbols]

1, 2 is a core (fixed iron core), 4 is a movable core (movable iron core), 5 is a needle (valve element), 7 is a return spring, 8 is a valve body, 9 is a filter, and 32 is a coil (excitation coil). 81, a valve hole, 83, a valve seat surface, 82, a fuel inflow hole (fluid passage), 700, a stopper plate, 7
01 is a communication hole of the stopper plate 700, 100 is a cylinder (housing), and 103 is a stopper plate receiving surface.

Claims (2)

[Claims] 1. A fixed iron core which slidably holds a movable iron core, and incorporates an exciting coil for biasing the movable iron core and a return spring, and has a valve hole having a distal end portion forming a valve seat surface. A valve body fixed to an iron core, a valve body that is held in the valve hole so as to be able to interlock with the movable iron core, opens and closes a valve by coming into contact with and separating from the valve seat surface, and has an opening in an outer peripheral surface of the valve body. A fluid passage communicating with the valve hole, a filter fixed to at least one of the fixed iron core and the valve body to surround an opening of the fluid passage, and a valve clearance between the valve body and the valve seat surface. An electromagnetic valve having a communication hole communicating with the valve hole, and having a stopper plate for restricting deviation of the valve body from the valve hole and setting a maximum value of the valve clearance. A solenoid valve, which is held by a solenoid valve. 2. The method of manufacturing a fuel supply device using an electromagnetic valve according to claim 1, wherein the stopper plate is press-fitted into the filter, then the electromagnetic valve is assembled to a housing, and the valve body surrounds the valve seat surface. A method for manufacturing a fuel supply device using an electromagnetic valve, wherein the stopper plate is sandwiched between a ring-shaped tip of the housing and a stopper plate receiving surface of the housing.