WO2017212727A1

WO2017212727A1 - Fuel injection valve

Info

Publication number: WO2017212727A1
Application number: PCT/JP2017/010056
Authority: WO
Inventors: 貴敏飯塚; 清隆小倉; 明靖宮本; 義人安川
Original assignee: 日立オートモティブシステムズ株式会社
Priority date: 2016-06-08
Filing date: 2017-03-14
Publication date: 2017-12-14
Also published as: JP6653017B2; JPWO2017212727A1

Abstract

The present invention reduces the risk of water infiltrating the interior of a fuel injection valve. A fuel injection valve provided with a valve body for opening and closing a flow channel for a fluid, wherein the fuel injection valve is provided with: a cylindrical part formed on a side adjacent to a fuel pipe to which the fuel injection valve is attached; and a sealing member which is attached to the outer peripheral side of the cylindrical part and attached to the fuel pipe, thereby sealing the space between the cylindrical part and the sealing member from external space.

Description

Fuel injection valve

The present invention relates to a fuel injection valve used in an internal combustion engine, and more particularly to a fuel injection valve that performs fuel injection by opening and closing a fuel passage by an electromagnetically driven mover.

As a background art in this technical field, there is a known fuel injection valve structure described in Japanese Patent Application Laid-Open No. 2008-19785. In a known fuel injection valve represented by this publication, a magnetic core provided with a through hole (center hole), a nozzle holder, and an orifice cup form a fluid flow path. Further, a valve body for opening and closing the flow path and a mover are included in the nozzle holder, and an electromagnetic coil for driving the mover is held in a space formed by the nozzle holder, the housing, and the magnetic core. The space is filled with a resin molded body, and the resin molded body surrounds the electromagnetic coil. The resin molded body forms a connector for flowing current through the electromagnetic coil.

JP 2008-19785 A

Since an automobile engine is used in various environments, liquid may be applied to a fuel injection valve attached to the automobile engine depending on the environment. Here, in the above-described conventional technology, there is a prisoner that a minute gap is formed at the interface between the housing and the resin molded body or between the magnetic core and the resin molded body.

If the fuel injection valve attached to the automobile engine is subjected to moisture generated by its environment or the fuel injection valve itself is inundated, moisture may enter the fuel injection valve from the gap as described above. There is. In this case, the moisture may cause a malfunction of the valve body opening / closing of the fuel injection valve, or conversely, fuel may leak from the fuel injection valve through the gap.

Therefore, an object of the present invention is to suppress the risk of water entering the fuel injection valve.

In order to solve the above-described problems, the present invention provides a fuel injection valve including a valve body that opens and closes a fluid flow path, and a cylindrical portion formed on a fuel pipe side to which the fuel injection valve is attached; And a sealing member that is attached to the outer peripheral side of the tubular portion and that is attached to the fuel pipe to seal the space between the tubular portion from the external space.

According to the above configuration of the present invention, it is possible to suppress the possibility of water entering the inside of the fuel injection valve. Other configurations, operations, and effects of the present invention will be described in detail in the following embodiments of the present invention.

It is a figure which shows sectional drawing of the fuel injection valve and fuel piping in 1st Example of this invention. It is a figure which shows the external view of the fuel injection valve and fuel piping in 1st Example of this invention. It is a figure which shows the structure of the fuel injection valve in 1st Example of this invention with sectional drawing. It is a figure which shows the member which seals the fuel injection valve in the 1st Example of this invention, and the cylindrical part of fuel piping, and its cross section. It is a figure which shows an example of the member which supports the sealing member in 1st Example of this invention.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.

FIG. 1 shows a cross section of a basic configuration of a fuel injection valve and a fuel pipe according to Embodiment 1 of the present invention. FIG. 2 is an external view of the fuel injection valve and the fuel pipe of the first embodiment. FIG. 3 is a cross-sectional view showing the configuration of the fuel injection valve in this embodiment. FIG. 4 is an external view of a member for sealing the fuel injection valve and the fuel pipe in the first embodiment of the present invention. It is a figure which shows a cross section. FIG. 5 is a view showing an example of a member that supports the seal member in the first embodiment of the present invention.

The configuration of the fuel injection valve and the basic configuration in this embodiment will be described with reference to FIGS. The fuel injection valve in the present embodiment closes the fuel passage when the energization of the electromagnetic coil 105 is OFF, and opens the fuel passage by driving the mover 102 by electromagnetic attraction by turning on the energization of the electromagnetic coil 105. Perform fuel injection.

As shown in FIG. 1, the nozzle holder 101 includes a small diameter cylindrical portion 22 having a small diameter and a large diameter cylindrical portion 23 having a large diameter. A guide member 115 and an orifice cup 116 provided with the fuel injection port 10 are inserted and provided inside the distal end portion of the small diameter cylindrical portion 22. The guide member 115 is provided inside the orifice cup 116, and is fixed to the orifice cup 116 by press-fitting or plastic bonding, or has an integral structure with the orifice cup. The orifice cup 116 is welded and fixed to the distal end portion of the small diameter cylindrical portion 22 along the outer peripheral portion of the distal end surface.

The guide member 115 guides the outer periphery 114B of the valve body provided at the distal end of the valve body 114 constituting the movable portion 106 described later. A conical valve seat 39 is formed on the orifice cup 116 on the side facing the guide member 115. A valve body 114B provided at the tip of the valve body 114 abuts on the valve seat 39 to guide or block the fuel flow to the fuel injection port 10. A groove is formed on the outer periphery of the nozzle holder 101, and a seal member 131 typified by a resin-made chip seal is fitted into the groove. A magnetic core 107 is press-fitted into the inner peripheral portion of the large-diameter cylindrical portion 23 of the nozzle holder 101 and welded and joined at the press-fit contact position, and a gap formed between the inside of the large-diameter cylindrical portion 23 and the outside air. Is sealed.

A through hole (center hole) is provided at the center of the magnetic core 107, and fuel is guided to the through hole. The magnetic core 107 is provided with a fuel supply port 118, and a filter 113 is provided inside the fuel supply port 118. The fuel supply port 118 of the magnetic core is inserted in the cylindrical portion inner peripheral side 151 of the fuel pipe 150, and the sealing material 130 on the outer peripheral side of the fuel supply port 118 ensures liquid tightness with the external space. A fuel injection valve regulator 54 and a spring 110 are formed inside the magnetic core 107, and the valve body 114 is urged by the spring 110 in the valve closing direction. For this reason, when the electromagnetic coil 105 is not energized, the seat 114B of the valve body 114 is in contact with the valve seat 39 of the orifice cup on the downstream side of the nozzle holder, and the fuel is sealed. Here, the movable element 102 is supported by the valve body 114 and is urged in the valve opening direction by a zero spring 112 supported by a member 118 press-fitted into the nozzle holder between the nozzle holder 101 and the movable element 102. Yes.

Further, a throttle portion 213 is formed in a portion corresponding to the gap between the mover 102 and the magnetic core 107 of the nozzle holder 101. A cup-shaped housing 103 is fixed to the outer peripheral side of the large-diameter cylindrical portion 23 of the nozzle holder. A through hole is provided in the center of the bottom of the housing 103, and the large diameter cylindrical portion 23 of the nozzle holder 101 is inserted through the through hole. A portion of the outer peripheral wall of the housing 103 forms an outer peripheral yoke portion facing the outer peripheral surface of the large-diameter cylindrical portion 23 of the nozzle holder 101.

An annular or cylindrical electromagnetic coil 105 is disposed in a cylindrical space formed by the housing 103. The electromagnetic coil 105 is formed of an annular bobbin 104 having a U-shaped groove that opens outward in the radial direction, and a copper wire (electromagnetic coil 105) wound around the groove. A rigid conductor is fixed to the winding coil end and winding end of the electromagnetic coil 105, and is drawn from a through hole provided in the magnetic core 107. The outer periphery of the large-diameter cylindrical portion 23 of the conductor 109, the magnetic core 107, and the nozzle holder 101 is molded by injecting an insulating resin from the inner periphery of the upper end opening of the housing 103, and is covered with the resin molded body 121.

In addition, the resin molded body 121 simultaneously molds a connection portion (connector portion 122) with an engine control unit that supplies a drive current to the electromagnetic coil 105. After the connector from the engine side is connected to the connector portion 122, the terminal 109 of the electromagnetic coil 105 is conducted by passing a current.

The magnetic core 107 is arranged from the surface facing the movable portion 106 toward the upstream side. Specifically, the magnetic core downstream portion 107A facing the movable portion 106 and the magnetic core configured in a cylindrical shape at the center. It is composed of a cylindrical portion 107B and an upstream (common rail side) magnetic core upstream portion 107C. In this embodiment, 107A, 107B, and 107C are constituted by the integrated magnetic core 107, but may be constituted by combining other members.

The resin molded body 121 is configured to cover the outer peripheral side of the magnetic core downstream portion 107A and to cover the outer peripheral side of the magnetic core cylindrical portion 107B by the cylindrical portion 181. Further, the resin molded body 121 is configured such that the contact portion 161 is in contact with the lower surface of the magnetic core upstream portion 107C in the axial direction of the fuel injection valve.

The resin molded body 121 is configured to come into contact with each other at a contact portion 160 located on the downstream side with respect to the base of the housing 103 and the connector portion 122. It may be said that the contact portion 160 separates the housing 103 from the molded resin molded body 121. Further, the contact portion 161 between the magnetic core 107 and the resin molded body 121 is positioned on the upstream side with respect to the contact portion 160 and the root of the connector portion 122.

At this time, a slight gap may be formed between the housing 103 and the resin molded body 121 or between the magnetic core 107 and the resin molded body 121. On the other hand, depending on the method of attaching the fuel injection valve to the automobile engine or the environment around the automobile itself, moisture may be applied to the fuel injection valve. Alternatively, the fuel injection valve itself may be submerged.

Then, when water is directly applied to or submerged in the fuel injection valve, moisture is transferred to the inside of the fuel injection valve via the contact portion 160 between the housing 103 and the resin molded body 121 or the contact portion 161 between the magnetic core 107 and the resin molded body 121. There is a risk of intrusion. When this moisture reaches the electromagnetic coil 105, the opening operation of the fuel injection valve may be hindered. Further, since the housing 103 and the magnetic core 107 are made of metal, there is a possibility that corrosion of these metals is caused by moisture.

Therefore, in this embodiment, water is directly applied to the fuel injection valve or the fuel injection valve itself is submerged, and further between the housing 103 and the resin molded body 121 or between the magnetic core 107 and the resin molded body 121. Even if there is a gap between them, moisture prevents the fuel injection valve from entering the inside. For this purpose, in this embodiment, a seal member 170 as shown in FIGS. 1 to 3 is provided.

FIG. 4 is an external view of the seal member 170, and the seal member 170 includes a first opening 171, a second opening 172, and a third opening 173.
The cylindrical portion 181 configured on the center side of the resin molded body 121 is arranged on the fuel injection valve on the side where the fuel injection valve is attached to the fuel pipe 150. In addition, the fuel piping 150 of FIG. 1 has shown the attachment port of the common rail in which a fuel injection valve is attached. At least a part of the cylindrical portion 181 of the resin molded body 121 is located on the upstream side with respect to the center of the fuel injection valve.

As shown in FIG. 1, the seal member 170 is attached to the outer peripheral side of the tubular portion 181 and is configured to be sealed to the tubular portion 181 from the external space by being attached to the fuel pipe 150. Is done. Specifically, the fuel pipe 150 is provided on the outer peripheral side of the seal member 130 (O-ring) in which the first opening 171 of the seal member 170 shown in FIGS. 1 and 3 is on the outer peripheral side of the fuel supply port 118 of the fuel injection valve. Attached to. That is, the fuel injection valve is inserted and attached to the inner peripheral side of the fuel pipe 150, and at this time, the fuel inside the fuel pipe 150 is sealed so as not to leak to the outside by the sealing material 130 (O-ring). In addition, the cylindrical part 181 is further located on the inner peripheral side with respect to the inner peripheral part of the fuel pipe 150 (attachment port), and the first opening 171 is pressure-bonded to the outer peripheral surface 152 of the fuel pipe. To form a sealing surface.

That is, the seal member 170 is attached to the outer peripheral portion of the fuel injection valve attachment portion (fuel pipe 150), thereby sealing between the seal member 170 and the cylindrical portion 181 from the external space.

As a result, water is directly applied to the fuel injection valve, or the seal surface formed by the outer peripheral surface 152 of the fuel pipe and the first opening 171 does not enter the internal space against moisture from the upstream side of the fuel pipe. To prevent. Therefore, it is possible to prevent moisture from entering from the contact portion 160 between the housing 103 and the resin molded body 121 or the contact portion 161 between the magnetic core 107 and the resin molded body 121.

Moreover, as shown in FIG. 4, it is preferable that the inner peripheral side of the 1st opening part 171 which forms a sealing surface becomes a ring-shaped shape which protrudes to an inner peripheral side. That is, the seal member 170 is formed with a ring-shaped fuel pipe seal portion 174 that protrudes on the inner peripheral side with respect to the inner diameter portion on the upstream side, and the fuel pipe seal portion 174 contacts the fuel pipe 150. Thus, the space between the seal member 170 and the cylindrical portion 181 is sealed from the external space.

Since the ring-shaped fuel pipe seal portion 174 that protrudes toward the inner peripheral side of the seal member 170 positively contacts the outer peripheral surface 152 of the fuel pipe 150, the contact area is larger than when there is no convex ring-shaped portion. Becomes smaller. Therefore, compared with the state where the shape of the contact portion is not convex, the surface pressure generated on the contact surface is increased, and the surface pressure can be generated more efficiently on the seal surface.

As shown in FIGS. 1 and 3, the second opening 172 of the seal member 170 is located in the vicinity of the connector portion 122 that supplies a drive current to the electromagnetic coil 105 by the resin molded body 121 of the fuel injection valve. And the connector part 122 is located inside with respect to the 2nd opening part 172, and a 2nd opening part 172 is crimped | bonded with respect to the outer peripheral surface of the connector part 122, and a sealing surface is formed.

That is, the fuel injection valve of the present embodiment is attached to the connector portion 122 while being attached to the cylindrical portion 181 disposed on the fuel pipe side to which the fuel injection valve is attached and the outer peripheral side of the cylindrical portion 181. Thus, the sealing member 170 that seals the space between the cylindrical portion 181 from the external space is provided.

In other words, the seal member 170 is attached to the outer peripheral portion of the connector portion 122 to seal the space between the seal member 170 and the cylindrical portion 181 from the external space.

Thereby, water is directly applied to the fuel injection valve, or water from the upstream is transmitted to the connector 122 of the fuel injection valve via the connector on the engine side, and the contact portion 160 of the housing 103 and the molded resin 121 or the magnetic core. It can suppress flowing to the contact part 161 of 107 and the resin molding 121. That is, since the sealing surface can be formed by the outer peripheral surface of the connector portion 122 and the second opening portion 172, moisture intrusion into the internal space between the sealing member 170 and the cylindrical portion 181 is suppressed, and as a result, the contact portion. 160 or the captive invasion of moisture from the contact portion 161 is suppressed.

Here, the sealing surface formed by the second opening portion 172 and the outer peripheral surface of the connector portion 122 is the upstream end surface 176 of the second opening portion 172 shown in FIG. 4 and the downstream end surface of the connector portion 122 shown in FIG. It is good also as a structure which maintains sealing property by 123 contact | abutting and the upstream end surface 176 of the 2nd opening part 172 compressing.

In this case, in order to keep the state where the upstream end face 176 of the second opening 172 is compressed without changing the structure of the fuel injection valve, the outer peripheral portion of the housing 103 as shown in FIGS. A member 501 shown in FIG. Since the member 501 needs to maintain the assembled state even if it receives an axial reaction force when compressing the seal member 107, the member 501 has, for example, a ring shape and may be formed of resin or metal. desirable. Furthermore, it is desirable to generate the tightening force while being fixed to the housing 103. Since the member 501 in this embodiment is in contact with the housing 103 at a portion having a diameter larger than its inner diameter, the member 501 can be assembled with a pressing force.

Further, it is desirable that the upstream end surface 502 of the member 150 and the downstream end surface 177 on the third opening 173 side of the seal member are in contact with each other.

That is, in this embodiment, the downstream end surface 177 of the seal member 170 is supported by the upstream end surface of the member 501 by attaching the seal member 170 to the fuel injection valve. Specifically, the downstream end surface 177 of the seal member 170 contacts the housing 103 or the member 501 attached to the housing 103. As a result, the second opening 172 of the seal member 170 is pressed against the connector part 122 of the fuel injection valve, and the internal space between the seal member 170 and the connector part 122 is sealed from the external space.

The housing 103 is filled with a resin material, and the cylindrical portion 181 and the connector portion 122 are integrally formed with the same material as the resin material to form a resin molded body 121. The seal member 170 is urged in the axial direction by a member 501 attached to the housing 103, so that the connector portion 122 and the upper end surface 174 of the second opening 171 of the seal member 170 come into contact with each other. The internal space between the sealing member 170 and the external space is sealed. Although the member 501 and the housing 103 are described separately here, the member 501 that contacts the downstream end surface 177 of the seal member 170 may be formed integrally with the housing 103.

Thereby, water is directly applied to the fuel injection valve, or water from the upstream is transmitted to the connector 122 of the fuel injection valve via the connector on the engine side, and the contact portion 160 of the housing 103 and the molded resin 121 or the magnetic core. It can suppress flowing to the contact part 161 of 107 and the resin molding 121. That is, the upstream end surface 176 of the second opening 172 is compressed to form a seal surface with the downstream end surface 123 of the connector portion 122, and the internal space between the seal member 170 and the tubular portion 181 is formed. Water intrusion can be prevented. As a result, the captive intrusion of moisture from the contact portion 160 or the contact portion 161 is suppressed.

Further, when the upstream end surface of the second opening 172 is compressed to form a seal surface, it is necessary to normally transmit the pressure in the compression direction to the seal surface. It is necessary to secure a large thickness of the sealing member over the top. Therefore, it is desirable that the maximum outer diameter of the second opening 172 be smaller than the outermost diameter of the communication hole from the first opening 171 to the third opening 173.

That is, a communication hole extending from the first opening 171 through the third opening 173 through which the cylindrical portion passes and a second opening 172 through which the connector 122 passes through are formed in the seal member. In addition, the maximum outer diameter of the second opening is configured to be smaller than the maximum outer diameter of the communication hole from the first opening 171 to the third opening 173.

Thereby, even when the upstream end face of the second opening 172 is compressed and sealed, the seal member on the downstream side of the opening can be provided with sufficient rigidity, and the upstream of the second opening 172 can be provided. A normal surface pressure can be generated on the side end surface.

The third opening 173 is located on the outer peripheral side of the housing 103, and the inner peripheral side of the third opening 173 is pressed against the outer peripheral surface of the housing 103 to form a seal surface.

That is, the seal member 170 in the present embodiment seals the internal space between the seal member 170 and the cylindrical portion 181 from the external space by contacting the housing 103 or the member 501 attached to the housing 103.

In other words, when the downstream end surface 177 of the seal member 170 is in contact with the upstream end surface of the housing 103, the internal space between the seal member 177 and the cylindrical portion 181 is sealed from the external space.

Furthermore, the cylindrical portion 181 is made of a resin material, and is configured to come into contact with the metal member (the magnetic core upstream portion 107 </ b> C) with the fuel pipe 150. The seal member 170 seals the internal space between the contact portion 161 between the cylindrical portion 181 and the magnetic core upstream portion 107C and the seal member 170 from the external space.

Further, the housing 103 is filled with a resin material, and the cylindrical portion 181 and the connector portion 122 are integrally formed with the same material as the resin material to form a resin molded body 121. The seal member 170 seals the internal space between the contact portion 160 between the cylindrical portion 181 and the housing 103 and the seal member from the external space.

Accordingly, the third opening 173 and the outer peripheral surface of the housing 103 can be directly immersed in the fuel injection valve or submerged due to accumulation of moisture from the upstream side of the fuel pipe around the fuel injection valve. And form a sealing surface to prevent prisoners from entering the interior space.

Further, the inner peripheral side of the third opening 173 that forms the sealing surface is a ring-shaped cylindrical part sealing portion 175 that protrudes toward the inner peripheral side as shown in the sectional view of FIG. Is preferred. That is, the seal member 170 is formed with a ring-shaped tubular portion seal portion 175 that protrudes toward the inner peripheral side with respect to the inner diameter portion, and the tubular portion seal portion 175 comes into contact with the tubular portion 181 so that the seal member 170 is sealed. The space between the member 170 and the cylindrical portion 181 is sealed from the external space.

As a result, the cylindrical portion seal portion 175 of the seal member 170 positively comes into contact with the outer peripheral surface 152 of the fuel pipe 150, and the surface pressure generated on the contact surface compared to a state where the shape of the contact portion is not convex. This makes it possible to seal more efficiently.

In addition, the seal surface formed by the third opening 173 differs in shape depending on the engine specifications, and is not shown in the figure. However, the seal surface is pressure-bonded to the inner peripheral surface or the outer peripheral surface of the portion to which the fuel injection valve is attached, By forming the surface, it may be configured to prevent moisture from entering the internal space.

This makes it possible to form a sealing surface at the boundary surface between the third opening 173 and the engine-side mounting portion of the fuel injection valve, and to prevent the invasion of water from the sealing surface into the internal space.

The seal member 170 of the fuel injection valve having the above characteristics is a material that takes into consideration the heat resistance, water resistance, oil resistance, and workability when assembled to the fuel injection valve, particularly a rubber material, etc. It is desirable that it is integrally molded.

That is, the seal member 170 is integrally formed of a rubber material.
Further, the seal member is formed with a communication hole from the first opening 171 to the third opening 173 through which the cylindrical portion 181 passes, and a second opening 172 through which the connector portion 122 passes. It is desirable that the first opening and the second opening are integrally formed of the same material.

In other words, a communication hole from the first opening 171 to the third opening 173 formed along the cylindrical portion 181 and passing through the cylindrical portion is communicated with the third opening 173. A second opening 172 formed along the connector portion 122 and passing through the connector portion 122 is formed in the seal member 170.

Further, a communication hole formed from the first opening 171 to the third opening 173 formed along the tubular portion 181 and passing through the tubular portion 181 and the connector formed along the connector portion 122. A second opening 172 that passes through the portion 122 is formed in the seal member 170. The third opening 173 and the second opening 172 communicate with each other inside the seal member 170, and an elastic member is disposed therebetween so that the first opening 171 and the second opening 172 do not communicate with each other. It is desirable that

This makes it possible to realize a seal member suitable for the usage environment of the fuel injection valve by integral molding, and to realize a waterproof structure of the fuel injection valve at a low cost by adding one component.

In the case of integral molding, it is necessary to apply a large deformation to the seal member during assembly. By using a stretchable rubber material as the material, the shape and sealing properties can be secured against large deformation during assembly. Can be maintained. Further, the fuel injection valve may be exposed to moisture containing corrosive components, or may be exposed to a temperature environment such as a temperature change of 120 ° C., for example.
By making the rubber material to withstand these conditions, it becomes possible to maintain the sealing performance even in the environment where the fuel injection valve is used.

Further, as shown in FIG. 2, it is desirable that the seal member 170 has a tab-shaped portion 177 that is convex on the second outer peripheral portion. That is, the connector portion is formed along the connector portion formed along the cylindrical portion 181 and the communication hole formed in the first opening portion 171 and the third opening portion 173 passing through the cylindrical portion. A second opening 172 that passes through the inside of the seal member, and a convex portion 177 that is convex on the outer peripheral side is formed on the outer peripheral portion of the portion that forms the second opening 172 of the seal member. It is.

This convex portion 177 is used when the seal member is removed from the mold in the manufacturing process of the seal member. The molding die has the same shape as the sealing member. However, since the sealing member has an integral structure, the sealing member needs to be largely deformed and taken out when removed from the die. At that time, by using the convex portion 177, it can be easily deformed. The convex portion 177 can also be used when attached to the fuel injection valve.

DESCRIPTION OF SYMBOLS 10 ... Fuel injection port 22 ... Small diameter cylindrical part 23 ... Large diameter cylindrical part 39 ... Valve seat 54 ... Regulator 101 ... Nozzle holder 102 ... Anchor 103 ... Housing 104 ... Bobbin 105 ... Electromagnetic coil 106 ... Movable part 107 ... Magnetic Core 107B ... Lower end surface 107A of magnetic core 107 ... Inner peripheral surface (through hole) of magnetic core 107
DESCRIPTION OF SYMBOLS 108 ... Adapter 109 ... Conductor 110 ... Spring 112 ... Zero spring 113 ... Filter 114 ... Valve body 114B ... Valve body seat part 118 ... Fuel supply port 121 ... Resin molding 122 ... Connector part 123 ... Connector part downstream end surface 130 ... Seal material 150 ... Fuel pipe 151 ... Inner peripheral surface 152 of fuel pipe ... Outer peripheral surface 160 of fuel pipe ... Connection part 161 ... Connection part 170 ... Seal member 171 ... First opening 172 ... Second opening 173 ... First 3 opening 174 ... ring-shaped seal part 175 convex on the inner peripheral side ... ring-shaped seal part 176 convex on the inner peripheral side ... upstream end face 177 of the second opening part ... downstream of the seal member End surface 501 ... member 502 ... upstream end surface of the member

Claims

In a fuel injection valve having a valve body that opens and closes a fluid flow path,
A cylindrical portion formed on the side of the fuel pipe to which the fuel injection valve is attached;
A fuel injection valve, comprising: a seal member attached to the outer peripheral side of the cylindrical portion, and sealed to an external space between the cylindrical portion by being attached to the fuel pipe.
In a fuel injection valve having a valve body that opens and closes a fluid flow path,
A cylindrical portion disposed on the side of the fuel pipe to which the fuel injection valve is attached;
A fuel injection valve comprising: a seal member attached to an outer peripheral side of the cylindrical portion and a seal member that is attached to the connector portion and seals between the cylindrical portion from an external space.
The fuel injection valve according to claim 1 or 2,
The said sealing member is a fuel injection valve which seals between the said cylindrical parts from external space by contacting the member attached to the housing or the said housing.
The fuel injection valve according to claim 3,
The fuel injection valve which seals between the said sealing member and the said cylindrical part from external space because the downstream end surface of the said sealing member contacts the upstream end surface of the said housing.
The fuel injection valve according to claim 1 or 2,
The fuel injection valve that seals a space between the seal member and the tubular portion from an external space by being attached to an outer peripheral portion of a fuel injection valve attachment portion of the fuel pipe.
The fuel injection valve according to claim 1, wherein
The fuel injection valve that seals between the seal member and the cylindrical portion from an external space by being attached to the outer peripheral portion of the connector portion.
The fuel injection valve according to claim 2 or 6,
The seal member is a fuel injection valve integrally formed of a rubber material.
The fuel injection valve according to claim 1 or 2,
The cylindrical portion is made of a resin material, and is configured to come into contact with a metal member between the fuel pipe,
The said sealing member is a fuel injection valve which seals the space of the contact part of the said cylindrical part and the said metal member, and the said sealing member with respect to external space.
The fuel injection valve according to claim 2,
When the seal member is attached to the fuel injection valve, the downstream end surface of the seal member contacts the housing or the member attached to the housing,
Thus, the fuel injection valve that seals the space between the seal member and the connector portion from the external space by the opening portion of the seal member being pressed against the connector portion.
The fuel injection valve according to claim 2,
The cylindrical portion is formed in the first opening portion through the third opening portion, the second opening portion through which the connector portion is passed, and the seal member. A fuel injection valve in which the communication hole from the opening to the third opening and the second opening are integrally formed of the same material.
The fuel injection valve according to claim 2,
A communication hole extending from the first opening to the third opening, formed along the cylindrical portion, passing through the cylindrical portion, communicated with the third opening, and connected to the connector portion. A fuel injection valve having a second opening formed along the connector portion and formed in the seal member.
The fuel injection valve according to claim 2,
A communication hole from the first opening to the third opening that is formed along the cylindrical portion and passes through the cylindrical portion, and a connector hole that is formed along the connector portion and passes through the connector portion. A second opening is formed in the seal member;
The third opening and one side of the second opening communicate with each other inside the seal member, and the first opening and the second opening are elastic so as not to communicate with each other. A fuel injection valve in which members are arranged.
The fuel injection valve according to claim 2,
The seal member includes a first opening formed along the cylindrical portion and passing through the cylindrical portion, and a second opening formed along the connector portion and passing through the connector portion. Formed into
A fuel injection valve in which a convex portion that is convex toward the outer peripheral side is formed on an outer peripheral portion of a portion that forms the second opening of the seal member.
The fuel injection valve according to claim 2,
A communication hole from the first opening through the third opening to the third opening and a second opening through the resin molded body are formed in the seal member, and the first opening A fuel injection valve configured such that the maximum outer diameter of the communication hole from the first opening to the third opening is larger than the maximum outer diameter of the second opening.
The fuel injection valve according to claim 2,
The inside of the housing is filled with a resin material, and the cylindrical portion and the connector portion are formed integrally with the same material as the resin material,
The said sealing member is a fuel injection valve which seals the space between the contact part of the said cylindrical part and the said housing, and the said sealing member with respect to external space.
The fuel injection valve according to claim 2,
The inside of the housing is filled with a resin material, and the cylindrical portion and the connector portion are formed integrally with the same material as the resin material,
The seal member is biased in the axial direction by a member attached to the housing, so that an upper end surface of the second opening of the seal member comes into contact with the seal member, A fuel injection valve that seals the space against the external space.
The fuel injection valve according to claim 1 or 2,
The seal member is formed with a ring-shaped fuel pipe seal portion that is convex on the inner peripheral side with respect to the inner diameter portion on the upstream side,
The fuel injection valve which seals between the seal member and the cylindrical part from an external space by the fuel pipe seal part coming into contact with the fuel pipe.
The fuel injection valve according to claim 1 or 2,
The seal member is formed with a ring-shaped cylindrical portion seal portion that protrudes toward the inner peripheral side with respect to the inner diameter portion,
The fuel injection valve which seals between the seal member and the cylindrical part from the external space by the cylindrical part seal part coming into contact with the cylindrical part.