JP2002098254A - Seal structure of solenoid valve - Google Patents

Abstract

(57) [Problem] To reduce the number of parts of an electromagnetic valve to prevent deterioration of assemblability and increase in manufacturing cost. A connection interface (48d) between a bobbin (48a) and a resin coating member (48c) is located close to an opening (20a) of a magnetic path forming member composed of a housing (46) and a core (50). Therefore, it is possible to form the ring-shaped seal member 57 in which the connection interface seal portion 57a and the fluid seal portion 57b are integrated. In this configuration, the connection interface seal portion 57a can absorb backlash in the axial direction of the coil body 48. Thus, the ring-shaped sealing material 57
By forming, it is possible to reduce the number of parts of the electromagnetic valve 20 for suction metering, and it is only necessary to perform a single operation when disposing the ring-shaped sealing material 57. For this reason, it is possible to prevent deterioration in assemblability and increase in manufacturing cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a seal structure for an electromagnetic valve.

[0002]

2. Description of the Related Art In an electromagnetic valve that opens and closes a fluid passage by driving a valve body by an electromagnetic force, a seal is provided at an appropriate place to prevent the fluid in the fluid passage from leaking outside through the electromagnetic valve. Materials are arranged. For example, an electromagnetic valve that opens and closes a pressurized chamber of a high-pressure fuel pump is formed between the fuel passage and the coil body housing space to prevent fuel from leaking out of the fuel passage through the coil housing space or the like. Sealing materials are arranged at various places in order to seal the formed gap (JP-A-2000-186650).

[0003]

Further, in the electromagnetic valve, there is a possibility that short-circuiting of the coil may occur due to water entering the coil housing space. Therefore, the coil portion exposed from the bobbin is further coated with resin by injection molding with respect to the coil wound around the bobbin.
However, even with such a coating with a synthetic resin, there is still a possibility that water may enter from the connection interface between the bobbin and the synthetic resin. For this reason, it is necessary to completely prevent water from entering by sealing such a connection interface with a sealing material.

As described above, in the configuration of the electromagnetic valve,
In addition to the sealing material for preventing the fluid from leaking to the outside, a sealing material for preventing short-circuiting of the coil due to water entry is required. For this reason, there is a problem that the number of parts of the electromagnetic valve is increased, and the assemblability is deteriorated and the manufacturing cost is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the number of parts of an electromagnetic valve and to prevent deterioration of assemblability and increase in manufacturing cost.

[0006]

The means for achieving the above object and the effects thereof will be described below. 2. A sealing structure for an electromagnetic valve according to claim 1, wherein a portion of the bobbin around which the coil is exposed is covered with a covering member, and a center hole of the coil body. And a magnetic path forming member that forms a magnetic pole for driving a valve element that opens and closes a fluid passage by partially opening and penetrating the outer peripheral surface of the coil body. A fluid seal for preventing a fluid to be controlled from leaking to the coil body side at an opening of the magnetic path forming member, and a connection for sealing a connection interface between a bobbin of the coil body and a covering member. The interface seal is made of an integrally formed sealing material.

[0007] The connection interface position between the bobbin of the coil body and the covering member is relatively close to the opening position of the magnetic path forming member. Therefore, both the seal for the fluid and the seal for the connection interface can be realized by one integrally formed sealing material. By forming the seal material so that both the fluid seal and the connection interface seal can be performed, the number of parts of the electromagnetic valve can be reduced, and furthermore, when the seal material is further arranged, one operation is required. Will be done. For this reason, it is possible to prevent deterioration in assemblability and increase in manufacturing cost.

According to a second aspect of the present invention, in the configuration of the first aspect, the connection interface in the coil body is formed in a ring shape on both end sides in the axial direction of the coil body. In the connection interface, a seal for the connection interface on the opening side of the magnetic path forming member is:
The present invention is characterized in that a ring-shaped connection interface seal portion formed on a part of the seal material is arranged between the magnetic path forming member and the coil body.

A ring-shaped ring formed on a part of the sealing material is provided between the magnetic path forming member and the coil so as to seal the connecting interface on the opening side of the magnetic path forming member among the two connecting interfaces. A seal for the connection interface is arranged. Thereby, a seal for fluid and a seal for connection interface can be realized by one seal material.

When the covering member is formed on the bobbin at the connection interface opposite to the opening side of the magnetic path forming member, for example, when the covering member is formed by injection molding, the bobbin is formed on the resin injection port side. A sufficient seal can be obtained by melting or fusing the resin and the covering member. Therefore, sufficient sealing can be achieved by sealing only the connection interface on the opening side of the magnetic path forming member with the sealing material. Further, when sealing is required for both connection interfaces by a seal material, a separate seal material may be used for the connection interface opposite to the opening side of the magnetic path forming member.

As described above, since the opening of the magnetic path forming member and the connection interface on the opening side can be sealed with one sealing material, the number of parts of the electromagnetic valve can be reduced, and the assemblability is deteriorated. An increase in manufacturing cost can be prevented. Also in this case, as described above, if a sealing material is not required for the connection interface opposite to the opening side of the magnetic path forming member, the number of components of the electromagnetic valve can be further reduced,
Deterioration of assemblability and increase in manufacturing cost can be prevented.

In addition, the ring-shaped connection interface seal portion is disposed between the magnetic path forming member and the coil body, so that the coil body disposed in the magnetic path forming member has a play in the axial direction. Can be absorbed. Therefore, parts such as wave washers for absorbing backlash can be abolished, the number of parts can be further reduced, and deterioration of assemblability and increase in manufacturing cost can be more effectively prevented.

According to a third aspect of the present invention, in the configuration of the second aspect, the connection interface seal portion is provided with ring-shaped protrusions on both sides of the connection interface, thereby forming the connection. The interface is sealed.

As the seal of the connection interface, the connection interface can be sealed by arranging ring-shaped protrusions on both sides of the connection interface to form a sealed space at the connection interface portion.

According to a fourth aspect of the present invention, in the electromagnetic valve sealing structure according to any one of the first to third aspects, the magnetic path forming member projects through the center hole of the coil body toward the valve body. The depth of the opening formed between the outer peripheral surface of the columnar portion and the inner peripheral surface of the cylindrical portion formed to protrude toward the valve body from the magnetic path forming member covering the valve body side end surface of the coil body. The ring-shaped fluid seal portion formed in a part of the seal material is disposed in contact with the outer peripheral surface of the columnar portion and the inner peripheral surface of the cylindrical portion, so that the control object is controlled to the coil body side. Is sealed to prevent leakage of the fluid.

An opening of the magnetic path forming member covers an outer peripheral surface of a columnar portion of the magnetic path forming member projecting toward the valve body through a center hole of the coil body, and a magnetic path covering an end face of the coil body on the valve body side. When formed between the cylindrical member and the inner peripheral surface of the cylindrical portion formed so as to protrude toward the valve body from the forming member, a ring-shaped fluid sealing portion formed in a part of the sealing material is provided at the back of the opening. Can be arranged in contact with the outer peripheral surface of the columnar portion and the inner peripheral surface of the cylindrical portion. This can prevent the fluid to be controlled from leaking to the coil body side.

[0017] Further, the sealing material is formed by integrating the sealing portion for fluid and the sealing portion for connection interface at an angle, for example, by being bent at a right angle. For this reason, the positioning of the sealing material in the magnetic path forming member becomes easy, and the operation of arranging and fixing the sealing material at the time of manufacturing becomes easy, so that the assembling work becomes more efficient.

According to a fifth aspect of the present invention, in the electromagnetic valve seal structure according to any one of the second to fourth aspects, the magnetic path forming member includes a connecting portion sealing portion and a fluid sealing portion. The storage groove for any one or both is not formed.

Since the connection interface seal portion and the fluid seal portion seal different positions, they play a role of positioning in mutually different directions. For this reason, the position of the sealing material is naturally fixed by disposing it in the magnetic path forming member. Accordingly, a storage groove for one or both of the connection interface seal portion and the fluid seal portion is not required, and the storage groove need not be formed, so that the manufacturing cost can be further reduced.

According to a sixth aspect of the present invention, in the sealing structure for an electromagnetic valve according to any one of the second to fifth aspects, the seal portion for the connection interface has a ring-shaped support for restricting bending in the axial direction of the coil body. It is characterized in that the body is integrated.

As described above, by integrating the ring-shaped support into the seal portion for the connection interface and restricting the bending in the axial direction of the coil body, the position fixing property of the seal material becomes more effective, and the durability of the seal is improved. Can be improved.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] FIG. 1 is a schematic structural explanatory view of a high-pressure fuel pump 2 to which the above-described invention is applied, and a fuel supply system and a control system thereof. Here, the high-pressure fuel pump 2 supplies high-pressure fuel to a 6-cylinder in-cylinder injection gasoline engine (hereinafter abbreviated as engine) 4. In the engine 4, high-pressure fuel supplied from the high-pressure fuel pump 2 is directly injected from the fuel injection valve 6 into each combustion chamber. The high-pressure fuel pump 2 is supplied with low-pressure fuel pumped from a fuel tank 10 by a feed pump 8 via a fuel supply path 12 provided with a filter 12a. Note that, of the fuel pumped by the feed pump 8, the fuel not sucked into the high-pressure fuel pump 2 is returned to the fuel tank 10 via a relief passage 8b having a relief valve 8a.

The high-pressure fuel pump 2 has a cylinder body 1
4, a cover 16, a flange 18, and a suction metering electromagnetic valve 20. A cylinder 14a is formed at the center axis position of the cylinder body 14, and the plunger 2 is
2 is slidably supported in the axial direction. Cylinder 14a
A pressurizing chamber 24 is formed at the distal end of the plunger, and the volume of the pressurizing chamber 24 changes as the plunger 22 moves in and out. The pressurizing chamber 24 is connected to a discharge-side check valve 28 by a fuel pressure feed path 26. The discharge side check valve 28 is connected to the fuel distribution pipe 30 by the fuel pressure feeding path 26, and is opened when the pressure of the fuel in the pressurizing chamber 24 becomes high, and the high pressure fuel is supplied to the fuel distribution pipe 30. It is made to be pumped. When a larger amount of fuel than the injection amount is fed to the fuel distribution pipe 30 side, excess fuel is supplied to the fuel tank 1 through a relief passage 31 having a relief valve 31a.
Returned to 0. This prevents the fuel pressure from becoming excessive.

The cylinder body 14 and the lower flange 18
Between them, the spring seat 32 and the lifter guide 34 are arranged in a stacked state. An oil seal 36 is attached to the inner peripheral surface of the spring seat 32. The oil seal 36 has a substantially cylindrical shape, and the lower end portion 36a is in close sliding contact with the outer peripheral surface of the plunger 22. The fuel leaked from the gap between the plunger 22 and the cylinder 14a is accumulated in the fuel storage chamber 36b of the oil seal 36, and then returned to the fuel tank 10 via a fuel discharge pipe 36c connected to the fuel storage chamber 36b. It is.

A lifter 38 is accommodated in the lifter guide 34 so as to be slidable in the axial direction. Projection receiving portion 38b formed on the inner surface of bottom plate portion 38a of lifter 38
The lower end 22a of the plunger 22 is in contact with the plunger 22. The lower end 22 a of the plunger 22 is engaged with the retainer 40. And the spring seat 32 and the retainer 4
The lower end 22a of the plunger 22 is pressed against the protrusion receiving portion 38b of the lifter 38 by a spring 42 arranged in a compressed state between the plunger 22 and the lifter 38. The bottom plate 38 a of the lifter 38 is in contact with the fuel pump cam 44 by the pressing force from the lower end 22 a of the plunger 22. The fuel pump cam 44 is attached to, for example, an intake camshaft or an exhaust camshaft, and rotates in conjunction with the rotation of the engine 4. This rotation causes the bottom plate portion 38a of the lifter 38 to be pushed up by the cam nose 44a of the fuel pump cam 44, whereby the lifter 38 rises. In conjunction with this, the plunger 22 moves up so as to reduce the volume of the pressurizing chamber 24. This ascent process is a pressurizing process for the pressurizing chamber 24. In the pressurization process, the fuel in the pressurization chamber 24 becomes high pressure when the volume corresponding to the amount of fuel sucked into the pressurization chamber 24 is obtained. The high-pressure fuel pushes the discharge-side check valve 28 open, and the fuel distribution pipe 3
Discharge to the 0 side.

When the cam nose 44a of the fuel pump cam 44 is lowered, the lifter 38 and the plunger 2
2 is lowered by the urging force of the spring 42 and the pressure chamber 2
4. Increase the volume of 4. This descending stroke is the suction stroke.
In the suction stroke, an amount of fuel corresponding to the valve open period of the suction metering electromagnetic valve 20 is drawn into the pressurizing chamber 24 from the fuel supply path 12 side.

Here, the configuration from the suction-adjusting electromagnetic valve 20 to the pressurizing chamber 24 will be described with reference to a partially enlarged view of FIG. The suction-adjusting electromagnetic valve 20 is connected to the housing 4.
6, coil body 48, core 50, sub-valve body 52, main valve body 54
And a sheet body 56. The housing 46 has a substantially cylindrical shape made of a material having a high magnetic permeability, and has a shape in which a large diameter portion 46a and a small diameter portion 46b are connected by a step 46c. A coil body 48 is arranged inside the large diameter portion 46a. The core 50 is made of a material having a high magnetic permeability, and includes a disk portion 50a and a shaft portion 50b formed to project from the center of the disk portion 50a. This shaft 5
0b penetrates the center hole of the coil body 48 and
“a” covers one end side of the large-diameter portion 46a of the housing 46, and the housing 46 and the core 50 are fixed by caulking with the coil body 48 housed therein. As a result, the tip 50c of the shaft portion 50b of the core 50 and the housing 4
The tip end 46d of the small-diameter portion 46b of FIG. Then, with the protruding portion inserted into the cylindrical housing insertion portion 16 a above the cover 16, the housing 46 and the coil 4
8 and the entire core 50 are fixed to the cover 16 by crimping. The housing 46 and the core 50 correspond to a magnetic path forming member. In the coil body 48, a coil 48b is wound around a resin bobbin 48a formed by injection molding, and a resin covering member 48c is formed by injection molding on the coil 48b exposed from the bobbin 48a.

The distal end 50c of the shaft portion 50b of the core 50 and the distal end 46d of the small-diameter portion 46b of the housing 46 are separated from each other, so that they are formed as magnetic poles and also form the openings 20a. A ring-shaped sealing material 57 having a shape to be described later is arranged behind the opening 20a.

The cover 16 has a housing insertion portion 16a.
The cylindrical small-diameter valve body storage chamber 16b and the large-diameter valve body storage chamber 16c are coaxial with the housing insertion portion 16a, respectively.
And a sheet body storage chamber 16d. These are formed to have larger diameters as they move to the housing insertion portion 16a, the small-diameter valve body storage chamber 16b, the large-diameter valve body storage chamber 16c, and the seat body storage chamber 16d. The sub-valve 52 made of a high-permeability material is provided in the small-diameter valve housing 16b, the main valve 54 made of a high-permeability material from the small-diameter valve housing 16b to the large-diameter valve housing 16c, and a seat. Body storage room 1
The sheet body 56 is accommodated in 6d. A first ring-shaped spring 58 that engages with a step between the small-diameter valve element storage chamber 16b and the large-diameter valve element storage chamber 16c is disposed on the upper surface of the main valve element 54, and the main valve element 54 is moved to the seat element 56 side. It is energizing.
Also, a second space is provided between the tip 50c of the core 50 and the sub-valve element 52.
A ring-shaped spring 60 is disposed, and the sub-valve element 52 is
Biased to the side. Thus, the sub-valve element 52 can close the orifice 54a penetrating through the center of the main valve element 54.

The sheet 56 comprises an upper sheet 62 and a lower sheet 64. The upper sheet body 62 and the lower sheet body 64 are fixed in the sheet body storage chamber 16d by caulking the lower sheet body main body 64a at the lower edge of the sheet body storage chamber 16d. The lower sheet body 64 further includes a cylindrical portion 64b protruding downward from the lower sheet body main body 64a, and further includes a pressurizing chamber 24 of the cylinder body 14.
Are inserted into the accommodating concave portion 14b which is formed continuously. In addition, an edge of a valve body housing portion 66 also serving as a spring receiver is sandwiched and fixed in a gap formed between the upper sheet body 62 and the lower sheet body 64. Valve body storage 6
Reference numeral 6 denotes a concave shape and surrounds a lower opening of the intermediate supply channel 62b formed in the upper sheet body 62. A disk-shaped check valve element 68 is stored in a storage space 66a formed in the valve element storage section 66. The check valve body 68 is urged by the spring 66c to the lower opening of the intermediate supply flow path 62b. Therefore, when the pressure in the pressurizing chamber 24 becomes equal to or higher than the pressure in the intermediate supply flow path 62b, the check valve body 68 comes into contact with the check valve seat portion 62f of the upper seat body 62 as shown in FIG. The fuel in the pressurizing chamber 24 is prevented from flowing toward the intermediate supply channel 62b. Note that a stopper 66b is provided at the center of the valve element housing 66 so as to protrude into the storage space 66a. When the pressure on the side of the intermediate supply passage 62b becomes higher than the pressure on the side of the pressurizing chamber 24, the check valve body 68
However, the distance from the check valve seat portion 62f is regulated by the stopper 66b. A backup ring 70 and a seal ring 72 are housed in a seal ring housing groove 64d formed on the outer peripheral surface of the cylindrical portion 64b of the lower sheet body 64.

Opening 20a of electromagnetic valve 20 for intake metering
FIG. 3 shows the configuration of the ring-shaped sealing member 57 disposed at the back of the box. 3, (A) is a plan view, (B) is a front view, (C) is a bottom view, (D) is a perspective view, and (E) is (B).
FIG. 1F is a cross-sectional view taken along the line II, and FIG. The ring-shaped sealing material 57 includes a flat connection interface sealing portion 57a, a substantially cylindrical fluid sealing portion 57b formed coaxially with the connection interface sealing portion 57a, and a connection interface sealing portion 57a. Fluid seal 57
b and a through-hole 57c provided through the center portion. On the upper surface of the connection interface seal portion 57a,
Two ring-shaped ridges 57d, 57 formed concentrically
e is formed. A ring-shaped support 57f is integrated with the lower surface of the connection interface seal portion 57a.
The ring-shaped sealing material 57 is made of a rubber elastic member except for the ring-shaped support 57f.
Is made of a rigid metal plate and has a central hole 57 as shown in FIG.
g is formed in a disk shape, and the periphery of the center hole is curved downward for reinforcement. In FIG. 4, (A) is a plan view, (B) is a front view, (C) is a bottom view, (D) is a perspective view, (E) is a JJ cross-sectional view in (B), and (F). Is a perspective view seen from inside out. The ring-shaped sealing material 57 is formed integrally with the ring-shaped support 57f by injection molding a rubber elastic member. In addition, the cross section of the fluid seal portion 57b on the lower end side has a shape which is expanded in a substantially arc shape.

The ring-shaped sealing material 57 having such a shape is arranged as shown in FIG. That is, the connection interface sealing portion 57a of the ring-shaped sealing material 57 is disposed at the connection interface 48d of the coil body 48 between the bobbin 48a and the resin coating member 48c. This connection interface 48d
In the portion, the step 46c of the housing 46 and the coil body 4
8, the connection interface seal portion 57a is sandwiched.
The inner ring-shaped ridge 57d contacts the bobbin 48a, and the outer ring-shaped ridge 57e contacts the resin coating member 48c. Thus, the ring-shaped ridges 57d and 57e are arranged on both sides of the connection interface 48d, respectively, so that a closed space is formed at the connection interface 48d. Thus, the connection interface 48d is sealed. Therefore, the gap 20b between the disc portion 50a of the core 50 and the large diameter portion 46a of the housing 46, and the gap 2 between the resin coating member 48c and the large diameter portion 46a
Even if water enters through the gap 20d between the resin cover member 48c and the stepped portion 46c, it is possible to prevent water from entering the coil 48b from the connection interface 48d. Similarly, the disk portion 50a of the core 50 and the large diameter portion 46a of the housing 46
20b between the disc 50a and the resin covering member 48c, and the gap 2 between the disc 50a and the bobbin 48a.
0f and the gap 20g between the shaft portion 50b and the bobbin 48a, even if water enters, the coil 4
8b can be prevented from entering water.

Note that another connection interface 48e exists in a ring shape above the coil body 48. This connection interface 4
8e, when the resin coating member 48c is injection-molded to the bobbin 48a around which the coil 48b is wound, the resin coating member 48c is located on the resin injection port side. They are sufficiently molten. Therefore, a sufficient seal is formed at the connection interface 48e. Therefore, no sealing material is particularly arranged on the upper connection interface 48e. Depending on the manufacturing method of the coil body 48, if the upper connection interface 48e is not sufficiently melted, a separate sealing material may be provided.

On the lower surface side of the connection interface seal portion 57a, the ring-shaped support 57f is connected to the step portion 4 of the housing 46.
The ring-shaped sealing material 57 is in contact with the upper surface of the ring-shaped sealing material 57, and supports the entire shape of the ring-shaped sealing material 57, thereby fixing the axial position. Further, the fluid sealing portion 57b of the ring-shaped sealing material 57 is
, The outer peripheral surface of the columnar shaft portion 50b of the core 50 and the inner peripheral surface of the cylindrical small diameter portion 46b of the housing 46 contact. This seals the fuel present on the side of the sub-valve element 52 at the opening 20a. Further, the through hole 57 c of the ring-shaped sealing material 57 is connected to the columnar shaft 5 of the core 50.
Since 0b penetrates, the position in the direction orthogonal to the axis is also fixed.

In the high-pressure fuel pump 2, the suction-adjusting solenoid valve 20 formed as described above is disposed between the fuel supply path 12 and the pressurizing chamber 24.
By adjusting the valve opening periods of the sub-valve 52 and the main valve 54,
The amount of fuel suction into the pressurizing chamber 24 can be adjusted. By utilizing such a function of the intake metering electromagnetic valve 20, the electronic control unit (ECU) 80 can control the intake metering electromagnetic valve 20 during the operation of the engine 4 as described below. it can. The ECU 8
Reference numeral 0 denotes an engine speed, a crank angle, an intake pressure, a coolant temperature, an accelerator opening, a throttle opening, an oxygen concentration in exhaust gas, a fuel distribution pipe 3 from various sensors provided in the engine 4.
The fuel pressure in the fuel distribution pipe 30 and other various data are detected from the fuel pressure sensor 30a provided at the zero point. Then, based on these operation state data, the energization amount and energization timing of the coil body 48 of the suction adjustment electromagnetic valve 20, the fuel injection timing of the fuel injection valve 6, the fuel injection period, and the like are adjusted.

First, when the cam nose 44a rises due to the rotation of the fuel pump cam 44 during the operation of the engine 4, the plunger 22 is pushed up to start the pressurizing process. In this pressurizing step, the pressure Po in the pressurizing chamber 24 is close to the fuel vapor pressure until the volume of the pressurizing chamber 24 becomes equal to the volume of the liquid fuel sucked in the suction stroke by the rise of the plunger 22. It is maintained at low pressure. In this state, as shown in FIG. 5A, the sub-valve 52 and the main
Reference numeral 4 indicates that the energization of the coil body 48 is stopped and the valve is closed. Further, the check valve body 68 is closed when the pressure Po in the pressurizing chamber 24 has already become a low pressure close to the fuel vapor pressure.

The plunger 22 is further raised and the pressure chamber 24
When the internal volume equals the liquid fuel volume, the fuel begins to be pressurized to high pressure. Thereafter, the fuel pressure Po in the pressurizing chamber 24
Rises rapidly, pushes and opens the discharge side check valve 28, and discharges high-pressure fuel to the fuel distribution pipe 30 side. And
When the plunger 22 is almost at the top dead center, the ECU 80
Is controlled to generate an electromagnetic force in the coil body 48 to open only the sub-valve body 52. As a result, the sub-valve 52
Is attracted to the core 50 side and starts moving against the urging force of the second ring-shaped spring 60, and comes into contact with the tip 50 c of the core 50. As a result, as shown in FIG.
2 is in the valve open state, the orifice 54a penetrating through the central portion of the main valve body 54 is opened, and the fuel pressure in the intermediate supply flow path 62b becomes the same as the pressure on the fuel supply path 12 side. Therefore, until the orifice 54a is opened, the main valve body 54 is pressed against the seat portion 62d by the pressure difference between the pressure on the fuel supply path 12 side and the fuel pressure in the intermediate supply flow path 62b lower than this pressure. Although the force was present, the differential pressure was eliminated by the opening of the sub-valve element 52, and the pressing force disappeared. Then, the amount of current supplied to the coil body 48 is increased to saturate the magnetic flux in the sub-valve element 52, whereby the magnetic flux density to the main valve body 54 is rapidly increased to increase the attraction force, thereby increasing the attraction force. Is opened. At this time, the pressing force against the seat portion 62d has already disappeared as described above because the sub-valve element 52 has been opened first. Therefore, the main valve element 54 opens quickly against the first ring-shaped spring 58 even if the amount of increase in the amount of energization is small.

When the pressure Po in the pressurizing chamber 24 drops below the pressure on the side of the intermediate supply passage 62b when the plunger 22 moves downward, the check valve body 68 opens as shown in FIG. Fuel is sucked into the pressurizing chamber 24 from the fuel supply path 12 side through the space between the seal portion 54b of the main valve body 54 and the seat portion 62d of the upper seat body 62.

When the ECU 80 determines from the detected crank angle value that the amount of fuel required for one discharge has been sucked into the pressurizing chamber 24, the energization of the coil body 48 is completely completed. After stopping, the main valve element 54 and the sub-valve element 52 are returned to their original positions by the urging forces of the first ring-shaped spring 58 and the second ring-shaped spring 60. As a result, as shown in FIG. 6B, the main valve body 54 is
d, and the auxiliary valve element 52 is connected to the orifice 54 of the main valve element 54.
a is closed and both valves are closed. Therefore, the fuel supply path 12
Fuel supply from the side to the pressurizing chamber 24 side is stopped. Furthermore,
With the movement of the cam nose 44a, the plunger 22 is lowered by the urging force of the spring 42 until the pressurizing chamber 24 has the maximum volume. However, since the intake of fuel is stopped, the volume becomes larger than that of the liquid fuel. , The pressure chamber 24 is filled with low-pressure fuel vapor.

Then, when the plunger 22 starts to move upward with the pushing of the cam nose 44a, the state becomes as described with reference to FIG. Hereinafter, such an operation will be repeated. In such an operation, the amount of fuel sucked into the pressurizing chamber 24 is adjusted by the length of the valve-opening period of the main valve body 54, so that the amount of fuel discharged to the fuel distribution pipe 30 is determined. .

According to the first embodiment described above, the following effects can be obtained. (I). The connection interface 48d between the bobbin 48a and the resin coating member 48c is located close to the opening 20a of the magnetic path forming member including the housing 46 and the core 50.
Therefore, it is possible to form the ring-shaped seal member 57 in which the connection interface seal portion 57a and the fluid seal portion 57b are integrated. By forming the ring-shaped sealing material 57 in this way, the number of parts of the electromagnetic valve 20 for inhalation metering can be reduced, and the arrangement of the ring-shaped sealing material 57 also requires only one operation. become. For this reason, it is possible to prevent deterioration in assemblability and increase in manufacturing cost.

(B). As described above, the bobbin 48a and the resin coating member 48c are sufficiently sealed by fusion at the connection interface 48e on the side opposite to the opening 20a. Therefore, a seal for preventing water from entering the coil body 48 and a seal for preventing fuel from leaking from the opening 20a are required.
This can be realized by using two ring-shaped sealing members 57. In this way, the number of components of the suction metering electromagnetic valve 20 can be further reduced, and deterioration of assemblability and increase in manufacturing cost can be effectively prevented.

(C). Regarding the sealing of the connection interface 48d, the connection interface sealing portion 57a seals the connection interface 48d with two ring-shaped ridges 57d and 57e at intervals from both sides to form a sealed space. I have. Therefore, even if an error occurs during molding or assembling at the position of the connection interface 48d that appears on the surface of the coil body 48, the connection interface 48d can be reliably disposed in the closed space, and the sealing can be reliably performed.

(D). The connection interface seal portion 57a is disposed between the step 46c of the housing 46 and the axial end surface of the coil body 48, so that the housing 46
The axial play of the coil body 48 disposed in the magnetic path forming member composed of the coil 50 and the core 50 can be absorbed.
Therefore, parts such as wave washers for absorbing backlash can be abolished, the number of parts can be further reduced, and deterioration of assemblability and increase in manufacturing cost can be more effectively prevented.

(E). In the seal member 57, the connection interface seal portion 57a and the fluid seal portion 57b are bent at a right angle and integrated to seal a position different from the connection interface seal portion 57a and the fluid seal portion 57b. For this reason, since they play the role of positioning in mutually different directions, positioning in the housing 46 becomes easy. Therefore, the operation of arranging and fixing the sealing material 57 at the time of manufacturing becomes easy, so that the assembling operation becomes more efficient.

(F). Further, as described in (e) above, since the positioning is performed by the shape itself of the seal material 57, the storage groove for the connection interface seal portion 57a and the fluid seal portion 57b becomes unnecessary, and the storage groove is formed. Since there is no need to perform this, the manufacturing cost can be further reduced.

(G). The effects of (e) and (f) are as follows. A rigid ring-shaped support 57 f is integrated with the connection interface seal portion 57 a to regulate the bending of the connection interface seal portion 57 a in the coil body axial direction. So it is more noticeable.

In particular, the connection interface seal portion 57a integrated with the ring-shaped support 57f is sandwiched between the coil body 48 and the step 46c. This allows the sealing material 57
The whole is firmly fixed within the suction metering electromagnetic valve 20. Therefore, as described above, even if the sub-valve element 52 and the main valve element 54 are driven and the pressure vibration is transmitted to the nearby fluid seal portion 57b, the position of the seal member 57 can be firmly maintained. .

[Other Embodiments] In the first embodiment, an example of a gasoline engine is described. However, the seal structure of the electromagnetic valve of the present invention is a seal of an electromagnetic valve used for a high-pressure fuel pump of a diesel engine. It can be applied to structures, and it can be applied to electromagnetic valves for other uses.

In the first embodiment, the amount of fuel discharged into the fuel distribution pipe 30 during the pressurization stroke is adjusted by adjusting the amount of fuel sucked into the pressurizing chamber 24 during the suction stroke. Although it was a high-pressure type fuel pump, in addition to this, the seal structure of the electromagnetic valve of the present invention overflows a part of the fuel in the pressurization chamber during the pressurization process by opening the electromagnetic valve and leaving the remaining fuel. The present invention can also be applied to a spill metering type high pressure fuel pump for metering the fuel amount by closing the electromagnetic valve and discharging the fuel to the fuel distribution pipe side.

[Brief description of the drawings]

FIG. 1 is a schematic configuration explanatory view of a high-pressure fuel pump, a fuel supply system and a control system thereof according to a first embodiment.

FIG. 2 is an enlarged longitudinal sectional view of a main part of the high-pressure fuel pump according to the first embodiment.

FIG. 3 is a structural explanatory view of a sealing material according to the first embodiment.

FIG. 4 is a structural explanatory view of a ring-shaped support according to the first embodiment.

FIG. 5 is an explanatory diagram of the operation of the high-pressure fuel pump according to the first embodiment.

FIG. 6 is an explanatory diagram of the operation of the high-pressure fuel pump according to the first embodiment.

[Explanation of symbols]

2 ... High pressure fuel pump, 4 ... Engine, 6 ... Fuel injection valve,
Reference numeral 8: feed pump, 8a: relief valve, 8b: relief passage, 10: fuel tank, 12: fuel supply path, 12
a ... filter, 14 ... cylinder body, 14a ... cylinder, 14b ... storage recess, 16 ... cover, 16a ... housing insertion part, 16b ... small diameter valve body storage chamber, 16c ... large diameter valve body storage chamber, 16d ... seat body storage Chamber, 18 ... flange,
20: electromagnetic valve for inhalation metering, 20a: opening, 20
b, 20c, 20d, 20e, 20f, 20g ... gap,
22 plunger, 22a lower end, 24 pressurizing chamber, 2
6: fuel pressure feeding path, 28: discharge side check valve, 30: fuel distribution pipe, 30a: fuel pressure sensor, 31: relief passage,
31a ... relief valve, 32 ... spring seat, 34 ...
Lifter guide, 36 ... oil seal, 36a ... lower end, 36b ... fuel storage chamber, 36c ... fuel discharge pipe, 38 ...
Lifter, 38a: bottom plate portion, 38b: protrusion receiving portion, 40: retainer, 42: spring, 44: cam for fuel pump,
44a cam nose, 46 housing, 46a large diameter portion, 46b small diameter portion, 46c stepped portion, 46d tip,
48: coil body, 48a: bobbin, 48b: coil, 4
8c: resin coating member, 48d: connection interface, 48e: connection interface, 50: core, 50a: disk portion, 50b: shaft portion,
50c: tip, 52: sub-valve, 54: main valve, 54a ...
Orifice, 54b ... seal part, 56 ... sheet body, 57
... seal material, 57a ... connection interface seal portion, 57b ... fluid seal portion, 57c ... through hole, 57d, 57e ... ring-shaped ridge, 57f ... ring-shaped support, 57g ... center hole,
58: first ring-shaped spring, 60: second ring-shaped spring, 6
2 Upper sheet body, 62b Middle supply channel, 62d Seat section, 62f Check valve seat section, 64 Lower sheet body, 64a Lower body body, 64b Tube section, 64
d: seal ring accommodation groove, 66: valve element accommodation part, 66a ...
Storage space, 66b: stopper, 66c: spring, 68 ...
Check valve element, 70 backup ring, 72 seal ring, 80 ECU.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirocho Tanmura 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Kazuhide 3-5 Akebonocho, Toyota City, Aichi Prefecture Tamadic Corporation F term (reference) in Toyota Works 3H106 DA07 DA13 DA23 DB02 DB12 DB23 DB32 DC02 DD03 EE34 EE35 GA01 GA30 GB23 GC08 GD04 KK18 3J040 AA02 AA11 AA17 BA01 EA01 EA15 EA17 EA25 FA05 HA01 HA02 HA03 HA15 HA30

Claims (6)

[Claims] 1. A ring-shaped coil body comprising a bobbin on which a coil is wound and a portion where the coil is exposed is covered with a covering member, and a coil body penetrating a center hole of the coil body. A magnetic path forming member that forms a magnetic pole for driving a valve body that opens and closes a fluid passage by partially opening and covering the outer peripheral surface of the electromagnetic valve. A fluid seal for preventing fluid to be controlled from leaking to the coil body side at an opening portion of the member, and a connection interface seal for sealing a connection interface between the bobbin of the coil body and the covering member are integrally formed. A seal structure for an electromagnetic valve, wherein the seal structure is made of a sealing material. 2. The structure according to claim 1, wherein the connection interface in the coil body is formed in a ring shape on both end surfaces in the axial direction of the coil body, and the magnetic path is formed in the connection interface. Sealing with respect to the connection interface on the opening side of the member is performed by disposing a ring-shaped connection interface seal portion formed on a part of the seal material between the magnetic path forming member and the coil body. A seal structure for an electromagnetic valve. 3. The structure according to claim 2, wherein the connection interface sealing portion seals the connection interface by disposing ring-shaped ridges on both sides of the connection interface. Electromagnetic valve seal structure. 4. The coil body according to claim 1, wherein: an outer peripheral surface of a columnar portion of a magnetic path forming member that projects through the center hole of the coil body toward the valve body; A part of the sealing material is formed at the back of the opening formed between the magnetic path forming member covering the valve body side end surface and the inner peripheral surface of the cylindrical portion formed to protrude toward the valve body. By disposing the ring-shaped fluid seal portion in contact with the outer peripheral surface of the columnar portion and the inner peripheral surface of the cylindrical portion, the fluid to be controlled is prevented from leaking to the coil body side. A sealed structure of an electromagnetic valve, which is sealed. 5. The magnetic path forming member according to claim 2, wherein the magnetic path forming member has a storage groove for one or both of the connection interface seal portion and the fluid seal portion. A seal structure for an electromagnetic valve, wherein the seal structure is not formed. 6. A structure according to any one of claims 2 to 5, wherein a ring-shaped support member for regulating bending in the axial direction of the coil body is integrated with the connection interface seal portion. The electromagnetic valve seal structure.