JP2002206641A - Seal structure of pipe joint and fuel injection unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure of a pipe joint capable of securing high sealing ability with small axial force so as to achieve space-saving in the connecting portion of the pipe joint, and a fuel injection unit. SOLUTION: When a joint 14 is screwed on an injector 2, a corner part 26 of the joint 14 side abuts on an inclined surface part 30 of a washer 21, and a corner part 29 of the injector 2 side abuts on an inclined surface part 31 of the washer 21, thereby forming linear sealing parts 32, 33. In such screwing, a flat surface-like abutting part 25 of the joint 14 and a flat surface- like abutting part 28 of the injector 2 both abut on the washer 21 in the state of crushing the washer 21, thereby forming flat surface parts 35, 36.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint seal structure and a fuel injection unit.

[0002]

2. Description of the Related Art Conventionally, Japanese Utility Model Laid-Open Publication No. 48-5163 discloses a washer 61 for tightening a construction material shown in FIG.
Is disclosed. The tightening washer 61 includes a packing ring 62 having a projecting portion 62 a having a mountain-shaped cross section, and a washer 63 to which the packing ring 62 is fixed. The tightening washer 61 is formed, for example, in the hole 6 of the construction material 64.
When the nut 67 is screwed into the bolt 66 protruding from the fifth member 5, the nut 67 is interposed between the nut 67 and the construction material 64 to prevent water leakage into the hole 65. However, in this sealing structure, the tightening washer 61 is supported by the construction material 64 on the slope 62 b of the overhang portion 62 a, so the screwed nut 67 and the bolt 66 are attached to the construction material 64 by the play of the screw portion 68. There was a possibility of leaning. In addition, since this seal structure is a structure that only needs to prevent water leakage and the like, the sealability is not so high, and there is a problem that this seal structure is not suitable for use in, for example, a pipe joint through which a high-pressure fluid flows.

[0003] Therefore, as a seal structure of a pipe joint in which the sealing property is ensured, a structure shown in FIGS. 7 and 8 has been proposed. FIG. 7 shows a seal structure using a copper washer. That is, the joint 69 is
The mounting member 71 is screwed to the mounting member 71 with a copper washer 72 interposed therebetween. In this sealing structure, when the joint 69 is screwed, the washer 7 is
The sealing surface 73 is formed by crushing 2. FIG. 8 shows a seal structure using a rubber O-ring. That is, the joint 69 is screwed to the mounting member 71 with the O-ring 74 interposed between the washer 70 and the mounting member 71. In this sealing structure, the sealing performance is secured by the O-ring 74. .

[0004]

The washer 7
In the sealing structure shown in FIG. 7 in which the seal surface 73 is formed by crushing the joint 2, the joint 69 requires an axial force to crush the washer 72. Or screw length is required.
However, when the screw diameter and the screw length of the joint 69 are restricted due to the arrangement space, there is a problem that a necessary axial force cannot be obtained.

On the other hand, in the sealing structure shown in FIG. 8 in which an O-ring 74 is used for sealing, a space for arranging the O-ring is required in the washer 70, so that the diameter of the washer 70 is correspondingly large. There was a problem of becoming. In addition to this
The joint 69 needs an axial force to such an extent that the screw portion 75 is not loosened by the repulsive force of the rubber by the O-ring 74. Therefore, in this case, similarly, when the screw diameter and the screw length of the joint 69 are restricted, a problem arises in that a necessary axial force cannot be obtained.

Therefore, as shown in FIG.
It is also conceivable to interpose a rubber O-ring 78 between the shaft portion 76 and the hole 77 into which the shaft portion 76 is screwed. However, in this sealing structure, although the diameter of the washer 70 can be made relatively small, a space for disposing the O-ring 78 is required for the shaft 76 of the joint 69, and the shaft of the joint 69 becomes relatively long. Will occur. In addition to the above problems, this type of joint 69
Since it is used for a pipe connection joint using a high-pressure fluid, it is necessary to ensure high sealing properties.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a first object of the present invention is to ensure high sealing performance with a small axial force. An object of the present invention is to provide a pipe joint seal structure and a fuel injection unit that can save space. A second object is to achieve the first object and improve the sealing effect by providing a flat portion.

[0008]

According to the first aspect of the present invention, there is provided a pipe joint seal structure in which a pipe joint is attached to a member to be attached via an interposition member. A line seal portion is formed between the pipe joint and the interposed member and at least one between the pipe joint and the attached member.

According to the present invention, since the structure is such that the sealing is performed by the wire seal portion, the required surface pressure can be obtained with a small axial force, so that the diameter and length of the pipe joint can be reduced. Thereby, space saving of the seal structure of the pipe joint can be achieved while ensuring the sealability of the pipe joint.

According to a second aspect of the present invention, in the first aspect of the invention, the line seal portion has a corner formed on at least one of the pipe joint and the attached member.
It is formed by contacting the surface of the interposition member.

According to the present invention, in addition to the function of the first aspect, the corner portion formed on at least one of the pipe joint and the attached member comes into contact with the surface of the interposition member, so that the line seal portion is provided. Is formed.

According to a third aspect of the present invention, in the first or second aspect of the invention, the wire seal portion is provided between the pipe joint and the interposed member and between the pipe joint and the attached member. It is provided for both.

According to the present invention, in addition to the function of the first or second aspect of the present invention, wire seal portions are provided on both sides between the pipe joint and the interposed member and between the joint and the attached member. Therefore, the sealing effect can be further improved.

According to the fourth aspect of the invention, the first to third aspects are provided.
In the invention described in any one of the above, a flat portion is formed between the pipe joint and the interposition member and at least one between the pipe joint and the attached portion.

According to this invention, in addition to the operation of the invention described in any one of the first to third aspects, the pipe joint is screwed by the flat portion without being inclined with respect to the member to be mounted.
Inconvenience that the seal is screwed in an incomplete state is less likely to occur, and the effect of improving the sealability can be achieved. In addition to this
The positioning of the pipe joint is also improved.

According to a fifth aspect of the present invention, in the fourth aspect of the invention, the line seal portion and the flat portion are provided between the pipe joint and the interposed member and between the pipe joint and the attached member. Are provided in both.

According to this invention, in addition to the function of the invention described in claim 4, since the flat portions are provided on both sides between the pipe joint and the interposed member and between the joint and the attached member, The effect of suppressing the inclination of the pipe joint at the time of screwing can be improved. In addition, since the wire seal portions are also provided on both sides between the pipe joint and the interposed member and between the joint and the attached member, the sealing effect can be further improved.

[0018] According to the invention described in claim 6, according to claims 1 to 5,
In the invention described in any one of the above, the interposition member is made of a metal softer than the pipe joint and the attached member.

According to this invention, in addition to the effect of the invention described in any one of the first to fifth aspects, since the interposition member is easily crushed when the pipe joint is screwed, the line seal can be easily formed. It becomes possible to form a part and a plane part.

According to the seventh aspect of the present invention, the second to sixth aspects are provided.
In the invention described in any one of the above, the corner portion is formed by recessing a groove portion on at least one surface of the pipe joint and the attached member.

According to this invention, in addition to the function of the invention described in any one of claims 2 to 6, the corner portion is formed by forming a groove in at least one surface of the pipe joint and the attached member. Is formed.

According to an eighth aspect of the present invention, in the seventh aspect of the invention, the intervening member has an annular flat plate shape, and a tapered tapered slope portion is formed on an outer peripheral edge portion. In the surface of the pipe joint or the member to be mounted, a corner portion and an abutment portion are formed by providing the groove portion on the same plane, and the line seal portion has the corner portion formed on the slope portion. The flat portion is formed by the contact portion being in contact with a planar contact portion of the interposition member.

According to the present invention, in addition to the function of the invention described in claim 7, the corners and the abutting portions are formed by providing grooves on the same plane on the surface of the pipe joint or the member to be mounted. The line seal portion is formed by contacting the corner portion with the slope portion of the interposition member, and the flat portion is formed by contacting the contact portion with the contact portion of the interposition member. This makes it possible to relatively easily implement a sealing structure having high sealing properties and saving space.

According to the ninth aspect of the present invention, the injection means for injecting the fuel, the pressure accumulating means for storing the high-pressure working fluid for operating the injection means, and supplying the high-pressure working fluid to the pressure accumulating means And a supply unit for supplying the fuel, wherein the injection unit, the pressure accumulating unit and the supply unit are connected by a pipe via a pipe joint, and at least one of connection points of the pipe joint, Claims 1 to 8
The seal structure of a pipe joint according to any one of the above is used.

According to the present invention, the same operation as that of any one of claims 1 to 8 is obtained,
Since the fuel injection unit has a high sealing property at the connection point of the pipe joint, high reliability as the device is ensured.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a pipe joint sealing structure embodying the present invention will be described below with reference to FIGS.

FIG. 4 is a schematic configuration diagram of a common rail type fuel injection device. Common rail type fuel injection device (hereinafter, referred to as
A fuel injection device 1) includes a plurality of pressure-intensifying injectors (hereinafter simply referred to as injectors) 2 as injection means for injecting fuel into a cylinder head (not shown), and fuel injected from each injector 2. A fuel supply unit 3 for supplying the injector 2 and a working fluid circulation unit 4 for supplying pressurized high-pressure fuel (working fluid) to the injector 2 are provided. The fuel injection device 1 includes a controller (electronic control device) 5, which controls the injector 2, the fuel supply unit 3, and the working fluid circulation unit 4.

The fuel supply unit 3 includes a pump 7 for pumping the fuel in the fuel tank 6 to the injector 2 and a valve 8 for adjusting the amount of fuel supplied to the injector 2. . On the other hand, the working fluid circulation unit 4 includes a fuel supply pump 9, a high-pressure pump 10 as a supply means, a common rail 11 as a pressure accumulation means, and a working fluid recovery device 12
It consists of. The fuel supply pump 9 pumps the fuel in the fuel tank 6 to the high-pressure pump 10. The high-pressure pump 10 pressurizes the fuel sent from the fuel supply pump 9 and sends the pressurized fuel to the common rail 11. The common rail 11 stores high-pressure fuel.

The high-pressure fuel in the common rail 11 is supplied to each injector 2 when the fuel supplied by the fuel supply unit 3 is injected from the injector 2. That is, high-pressure fuel is supplied to the injectors 2 from the common rail 11 by exciting the solenoid (not shown) built in each injector 2 by the controller 5. Thereby, the fuel supplied by the fuel supply unit 3 is pressurized,
Fuel is injected from the nozzle tip 2a of each injector 2 (see FIG. 2). The working fluid recovery device 12 recovers the fuel from the injector 2 and circulates the fuel so as to send the recovered fuel to the high-pressure pump 10. The fuel injection unit includes the injector 2, the common rail 11, and the high-pressure pump 10.

FIG. 2 is a side view showing the injector and its peripheral portion. The injector 2 and the common rail 11 are connected via an iron pipe (pipe) 13, and joints 14, 14 as pipe joints are used at each connection point. 2
Of the two joints 14, 14, the joint 14 connecting the common rail 11 side is screwed to a connecting portion 15 provided on the lower surface of the common rail 11, while the joint 14 connecting the injector 2 side is connected to the injector body 16. It is screwed. Further, each connection point between the pipe 13 and the joint 14 is connected using a connecting portion 17, and the connecting portion 17 is screwed to the joint 14.

FIG. 1 is a sectional view of a main part showing a seal structure of a pipe joint. Since the seal structure on the side of the injector 2 is shown in the figure, the seal on the injector side will be described below, but the common rail 11 side has the same structure. For this joint 14, a pipe joint having a structure having shaft portions 19, 20 on both sides of a washer portion 18 is used, and the upper one of the two shaft portions 19, 20 in FIG. Is set large. The pipe 13 and the joint 14 are connected using a flare structure. That is, the pipe 13
In a state where the pinched portion 13a provided at the tip of the joint is sandwiched between the inner surface 17a of the connecting portion 17 and the tip of the joint 14,
By connecting this connecting portion 17 to the shaft portion 19 of the joint 14, the pipe 13 and the joint 14 are connected.

The shaft 20 of the joint 14 is
Washer 21 as an intervening member between the
Through the supply port 22 formed in the injector 2
Is screwed on. The washer 21 is a substantially annular (ring-shaped) flat plate, made of a copper-based metal (copper, brass, or the like) as a material, and is pressed by a predetermined amount by the joint 14 and the injector body 16 when screwing is completed. It is crushed and fixed. An internal passage 23 that connects the pipe 13 and the supply port 22 is formed inside the joint 14, and a high-pressure fuel of about 200 atm, which is pressurized by the common rail 11, flows through the internal passage 23.

An annular groove 24 is formed on the surface of the washer 18 of the joint 14 on the injector body 16 side.
That is, the groove 24 is formed by forming a groove on the surface of the washer 18 which is flush, and the surfaces formed on both sides of the groove 24 are arranged on the same surface. As described above, the planar contact portion 25 is formed on the surface of the washer 18 on the inner peripheral side of the groove 24, and the corner 26 is formed along the outer periphery of the groove 24.

On the other hand, an annular groove 27 is also formed on the surface of the injector body 16 at a position facing the groove 24 of the joint 14. That is, the groove 27 is formed by forming a groove on the surface of the injector body 16 which is flush with the surface of the injector body 16.
The surfaces formed on both sides of the groove 27 are arranged on the same plane. Thus, the groove 27 is formed on the surface of the injector body 16.
A planar contact portion 28 is formed on the inner peripheral side, and a corner 29 is formed along the outer periphery of the groove 27.

FIGS. 3A and 3B are explanatory views for explaining the deformation effect of the washer generated when the joint is screwed to the injector body. FIG. 3A is a view immediately before the deformation, and FIG. After deformation (after completion of screwing). As shown in FIG. 3A, on the outer peripheral portion of the washer 21, slope portions 30, 31 are formed on both sides in the mounting direction of the joint 14, and the slope portions 30, 31 are tapered toward each other as they approach the outer peripheral side. It is formed in a shape. This slope 3
At 0 and 31, slope portions 30 and 31 are formed over the entire area in the circumferential direction. Also, each corner 26, 29 and the slope 30, 30
1 is set so that when the washer 21 is crushed by the contact portions 25 and 28 of the joint 14 when the joint 14 is screwed, the corners 26 and 29 bite into the slopes 30 and 31.

When screwing the joint 14, first, as shown in FIG.
6, the contact portion 25 of the joint 14 and the contact portion 28 of the injector body 16 are brought into contact with the planar contact portion 34 of the washer 21. When the joint 14 is screwed into the injector body 16 from this state, the washer 21 is formed by the contact portion 25 of the joint 14 and the contact portion 28 of the injector body 16 as shown in FIG. It is crushed and the screwing of the joint 14 is completed. At this time, the ends of the corners 26 and 29 are placed in the washer 21 with the corners standing.
Bites into the slopes 30 and 31 of the abutment.

As described above, the joint 14 and the washer 2
1 and between the injector body 16 and the washer 21, the line seal portions 32 and 33 are formed by the respective corner portions 26 and 29 biting into the slope portions 30 and 31. Similarly, between the joint 14 and the washer 21 and between the injector body 16 and the washer 21, the contact portion 25 of the joint 14 and the contact portion 28 of the injector body 16 crush the washer 21. Plane portions 35 and 36 are formed respectively. The line seal portions 32 and 33 and the flat portions 35 and 36 are formed over the entire circumferential direction. Note that the seal structure of the present example is also adopted at a connection point of a pipe connecting the common rail 11 and the high-pressure pump 10. Therefore, the attached member is constituted by the injector 2, the high-pressure pump 10, and the common rail 11.

In this embodiment, since a line seal is employed for the seal structure of the joint 14, a necessary axial pressure is secured with a small axial force when the joint 14 is screwed. Thus, the screw diameter A and the shaft length B (both refer to FIG. 1) of the joint 14 can be reduced, and the diameter of the washer portion 18 can be reduced. Space can be saved at the location. In particular, in this example, since the wire seal portions 32 and 33 are provided on both sides of the joint 14 and the injector body 16, high sealing performance is ensured.

The joint 14 has a flat contact portion 2.
By crushing the washer 21 with 5, 28, it is screwed to the supply port 22 of the injector body 16 so that the flat portions 35, 36 are formed. For this reason, even if there is play in the screw portion 37 of the joint 14, the play is absorbed by the flat portions 35 and 36, and a problem that the joint 14 is inclined and screwed is less likely to occur. Therefore, since the joint 14 is difficult to be screwed by being inclined, problems such as a problem that the pipe mounting accuracy is deteriorated and a problem that the joint 14 is screwed in an incompletely sealed state are less likely to occur.

Therefore, in this embodiment, the following effects can be obtained. (1) In this example, since the required surface pressure can be obtained with a small axial force by adopting a line seal in the seal structure of the joint 14, the screw diameter A and the shaft length B of the joint 14 and the washer 18 Can be small in diameter. Therefore, in a state where the sealing property of the joint 14 is secured, the joint 1
4 can save space. Further, since the wire seal portions 32 are provided on both sides of the washer 21, higher sealing performance can be ensured as compared with the case where the wire seal portions 32 are provided only on one side.

(2) Since the joint 14 is screwed to the injector body 16 (or the connecting portion 15 of the common rail 11) with the flat portion 35, the joint 14 is screwed by the flat portion 35 without being inclined. Is done. Thereby, the effect of improving the sealing performance can be achieved, and the positioning performance when connecting the pipe 13 is also improved. Especially the joint 1 of this example
4 is used in the fuel injection device 1,
A fuel of about 200 atm flows through the internal passage 23. Even with the joint used for the pipe 13 through which such high-pressure fuel flows, the sealability of this example can be sufficiently secured.

(3) In the seal structure of this embodiment, the groove 24 is formed on the joint 14 side, and the slope 3 is formed on the washer 21 side.
0, the line seal portion 32 and the flat portion 3
5 are provided. Therefore, a seal structure having high sealing properties and saving space can be implemented relatively easily. In particular, in the seal structure of this example, grooves 24 and 27 are formed by forming grooves in the surface of the injector body 16 and the surface of the washer 18 which are flush with each other. Then, the corner portions 26 and 29 formed by the grooves 24 and 27 are brought into contact with the slopes of the washer, and the flat contact portions 25 and 28 are brought into contact with the washer 21 so that the line seal portions 32 and 33 are formed. And plane part 3
5, 36 are formed. Therefore, processing when adopting the seal structure of this example is simple, and a high sealing effect can be obtained.

(4) Since the washer 21 is made of metal, there is no fear of corrosion or the like. Further, since the washer 21 is made of a copper-based metal that is softer than the joint 14 and the injector main body 16, the washer 21 itself is easily deformed, and the line seal portions 32 and 33 and the flat portions 35 and 36 can be easily formed.

(5) The seal structure of this example is adopted at the connection point of the pipe 13 connecting the injector 2 and the common rail 11 and at the connection point of the pipe connecting the common rail 11 and the high-pressure pump 10. Therefore, the fuel injection unit, which includes the injector 2, the high-pressure pump 10, and the common rail 11, assures high sealing properties at the connection points of the respective pipes, thereby ensuring high reliability as a device.

The embodiment is not limited to the above, and may be changed to the following mode, for example. ○ The seal structure of the joint 14 of this embodiment is shown in FIGS.
The structure is not limited to the structure shown in FIG.
It is also possible to employ the structure shown in FIG. Less than,
Specific examples are listed in order. In FIG. 5A, a seal structure having a line seal portion 32 and a flat portion 35 on only one surface of the washer 21 (the surface on the joint 14 side) is employed. In FIG. 3B, the height of the corner 26 formed in the joint 14 is set to be higher than the contact part 25 by X. In FIG. 3C, a projection 41 is provided on the joint 14, and a corner 42 formed on the projection 41 abuts the slope 30 of the washer 21, and is located on the inner peripheral side with respect to the projection 41. By contacting the contact portion 43 with the washer 21, the line seal portion 32 and the flat portion 35 are formed.

In FIG. 4D, the groove 2 of the joint 14 is shown.
A corner portion 44 having a curved cross-sectional shape is provided on the outer peripheral side of 4, and the corner portion 44 contacts the slope 30 of the washer 21 to form the line seal portion 32. Note that the drawing is a view before the joint 14 and the washer 21 are in contact with each other, and the line seal portion and the flat surface portion are formed by screwing the joint 14 in the arrow direction in the drawing. In FIG.
The flat portion 35 is formed by contacting the contact portion 45 with the washer 21. In FIG. 6F, a projection 46 is provided as a corner having a triangular cross-section on the joint 14, and the tip of the projection 46 is brought into contact with the washer 21 having a flat plate shape to thereby form the line seal portion 32.
Is formed.

In FIG. 5G, a projection 47 having a trapezoidal cross section is formed on the washer 21, and slopes 30, 30 formed on both sides of the projection 47 are respectively applied to the two corners 26, 26 of the joint. The two line seal portions 32 are formed by being in contact with each other. In this example, the number of locations for line sealing is two, so that the sealing effect is further improved. In FIG. 5H, a washer 21 is provided with a projection 48 having a triangular cross section, and the tip of the projection 48 is attached to the flat washer 18 of the joint 14.
The wire seal portion 32 is formed by contacting the wire seal portion 32. Also in the above case, the space saving of the seal structure by using the line seal structure and the effect of suppressing the inclination of the joint 14 by providing the flat portion 35 can be obtained.

The seal structure of the present embodiment has a line seal portion 32
The present invention is not limited to the structure having both the first and second flat portions 35.
That is, a structure in which the flat portion 35 is omitted and only the line seal portion 32 is provided may be employed.

The pipe joint is not limited to a joint having a shaft portion on both sides, but may be a joint having a shaft portion threaded on only one side. The structure for connecting the joint 14 and the pipe 13 is not limited to the flare structure. For example, another structure may be used such that a pipe having a female screw at the tip is directly screwed to the joint 14.

The interposed member is not limited to a washer made of copper or brass. When the joint 14 is screwed,
Any material may be used as long as it has a deformability capable of slightly deforming and is suitable for a seal member.

The seal structure of this embodiment is the same as the fuel injection device 1
The present invention is not limited to the use at the pipe connection portion. For example,
The seal structure of the present embodiment can be adopted at a pipe connection point of equipment such as a brake device, an ABS device, and a power steering device. The seal structure of this example may be mounted not only on an automobile but also on an industrial vehicle. For example, the seal structure may be applied to a piping connection point of a cargo handling system of an industrial vehicle.

Next, the definitions of the terms described in the present invention will be described below. (1) The line seal portion refers to a contact portion in which the contact area is reduced to concentrate the stress to improve the sealing property. In this case, the line seal portion has a line-like seal shape. It is called the line seal part.

The technical ideas other than the claims which can be grasped from the embodiment and other examples will be described below together with their effects. (1) In Claims 1 to 8, the pipe joint is attached to the attached member by screwing.

(2) In the first to eighth aspects, the line seal portion is formed in the entire circumferential direction. In this case, a high sealing effect is obtained. (3) In Claims 1 to 8, the interposed member is made of a copper-based metal.

(4) In the first to eighth aspects, the corner portion is formed on the interposed member, and the line seal portion is formed by contacting the corner portion with at least one of the pipe joint and the attached member. ing. Here, the protrusion 48 corresponds to a corner.

[0056]

As described above in detail, according to the present invention, since the connecting portion between the pipe joint and the member to be mounted is sealed by the wire seal portion, high sealing performance can be ensured even with a small axial force. As a result, it is possible to save the space for connecting the pipe joints.

[Brief description of the drawings]

FIG. 1 is a sectional view of a principal part showing a seal structure of a joint according to an embodiment.

FIG. 2 is a side view showing the injector and its peripheral portion.

FIGS. 3A and 3B are explanatory diagrams for explaining a deformation operation of a washer, in which FIG. 3A shows a state immediately before deformation and FIG. 3B shows a state after deformation.

FIG. 4 is a schematic configuration diagram of a common rail type fuel injection device.

FIGS. 5A to 5H are schematic diagrams showing a seal structure in another example.

FIG. 6 is a cross-sectional view of a main part showing a conventional seal structure of a washer for tightening a construction material.

FIG. 7 is a sectional view of an essential part of a seal structure using a copper washer.

FIG. 8 is a sectional view of a principal part of a seal structure using a rubber O-ring.

FIG. 9 is an essential part cross-sectional view of a seal structure in which an O-ring is provided on a shaft portion side.

[Explanation of symbols]

Reference numeral 2 denotes an injector that constitutes a member to be mounted and a fuel injection unit and also serves as an injection unit; 10 denotes a high-pressure pump that constitutes a member to be mounted and a fuel injection unit and supplies means; Composed and common rail as pressure accumulating means, 1
4 Joints as pipe joints, 21 Washers as intervening members, 24, 27 Grooves, 25, 28, 34, 4
3, 45 contact parts, 26, 29, 42, 44 ... corner parts, 3
0, 31: slope portion, 32, 33: line seal portion, 35, 3
6: flat portion, 46: protrusion as corner portion.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16L 15/04 F16L 15/04 Z 41/08 41/08

Claims (9)

[Claims] 1. A pipe joint sealing structure in which a pipe joint is attached to an attached member via an interposed member, wherein the pipe joint is between the pipe joint and the interposed member and between the pipe joint and the attached member. A pipe joint seal structure in which a wire seal portion is formed on at least one of the two. 2. The line seal portion according to claim 1, wherein a corner formed on at least one of the pipe joint and the attached member abuts on a surface of the interposition member. Pipe joint seal structure. 3. The pipe joint seal according to claim 1, wherein the wire seal portion is provided both between the pipe joint and the interposed member and between the pipe joint and the attached member. Construction. 4. A flat part is formed between at least one of the pipe joint and the interposed member and between the pipe joint and the mounted part. The seal structure of the pipe joint described in the above. 5. The pipe joint according to claim 4, wherein the wire seal portion and the flat portion are provided both between the pipe joint and the interposed member and between the pipe joint and the attached member. Seal structure. 6. The interposition member is made of a metal softer than the pipe joint and the attached member.
The seal structure for a pipe joint according to any one of the above. 7. The pipe joint according to claim 2, wherein the corner is formed by forming a groove in at least one surface of the pipe joint and the attached member. Seal structure. 8. The interposition member has an annular flat plate shape, and is formed with a tapered tapered slope portion at an outer peripheral edge thereof. A corner portion and a contact portion are formed by providing the groove portion on a plane, the line seal portion is formed by the corner portion contacting the slope portion, and the flat portion is formed by the contact portion. The pipe joint seal structure according to claim 7, wherein the seal structure is formed by contacting a planar contact portion of the interposition member. 9. Injection means for injecting fuel, accumulator means for storing a high-pressure working fluid for operating the injection means, and supply means for supplying a high-pressure working fluid to the accumulator means. The fuel injection unit provided, wherein the injection means, the pressure accumulating means, and the supply means are connected by a pipe via a pipe joint, and at least one of the connection points of the pipe joint is a fuel injection unit according to claim 1. A fuel injection unit using the pipe joint seal structure according to any one of the preceding claims.