JP2553639Y2 - Connection structure of branch connector in high pressure fuel manifold or block - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure of a branch connector such as a branch pipe or a branch fitting in a high-pressure fuel manifold or block, and not only fuel injection of a gasoline engine, but especially 1000 kgf / cm ² or more. The present invention relates to a connection structure of a branch connection body in a high-pressure fuel manifold to a diesel internal combustion engine serving as a fuel supply path of a vehicle.

[0002]

2. Description of the Related Art FIG. 8 is a side view including a cross-sectional portion showing a connection structure of a branch pipe as a branch connection body in a conventional high-pressure fuel manifold. A plurality of through holes 13 are formed in the flow passage 10 in the axial direction with respect to the flow passage 10 (only one through hole 13 is shown in FIG. 8).

A branch pipe 14 is inserted into each through-hole 13, and the branch pipe 14 and the main pipe 11 are fixed at a connecting portion w by means of brazing or welding. And the flow path 12 of the branch branch pipe 14 communicate with each other.

[0004]

In the above-described conventional connection structure of the branch connection body in the high-pressure fuel manifold, 1000 connection is required.
Since an ultra-high pressure flow of at least kgf / cm ² is repeatedly supplied and vibration is applied from a diesel internal combustion engine, a crack occurs in the connection portion w, leakage occurs due to fuel scattering, or the like, Or withdrew.

[0005] The present invention has been made in view of the current state of the connection structure of such a branch connection body as described above, and the purpose is to easily connect the branch connection body to a main pipe or a pipe without welding or brazing. It can be connected to the fuel block, the seal is completely made so that the fuel does not leak outside,
Another object of the present invention is to provide a connection structure of a branch connection body in a high-pressure fuel manifold or a block in which connection is not incomplete due to repeated supply of an ultra-high pressure flow or vibration from a diesel internal combustion engine.

[0006]

In order to achieve the above-mentioned object, a first embodiment of the present invention comprises a plurality of axially-located peripheral walls of a high-pressure fuel flow passage formed axially in a main pipe. In the through-hole, a pressure-receiving seat surface that is enlarged and opened in the circumferential direction of the main pipe is formed so that a branch connector having a flow path communicating with the communication hole is connected to the through-hole.
A screw is formed in a joint fitting provided around the pressure receiving seat surface with respect to the main pipe, a pressing head is formed at an end of the branch connection body, and the pressing head of the branch connection body is formed. A collar is inserted behind the nut, and a nut assembled on the side of the branch connection body is fastened to the screw, so that the pressing head comes into contact with the pressure receiving seat surface via the collar, thereby forming the branch. In a connection structure of a branch connection body in a high pressure fuel manifold for fixing a connection body to the main pipe, a seal is provided between a fastening member including the collar and the nut, an inner peripheral surface of the joint fitting, and an outer peripheral surface of the branch connection body. It has a configuration in which a ring is provided.

In a second embodiment of the present invention, an auxiliary seal ring is provided between the outer peripheral surface of the main pipe and the opposing surface of the fitting in addition to the configuration of the first embodiment. I have.

Further, in a third embodiment of the present invention, through holes are formed at a plurality of positions in the axial direction in a circumferential wall of a flow passage formed in the fuel block and through which high-pressure fuel flows, and the through holes are formed in the through holes. A pressure receiving seat surface is formed in the fuel block so as to be extended so that branch connection bodies each having a flow path communicating with the flow passage are connected to each other, and a screw is provided in a mounting hole portion extending from the pressure receiving seat surface to the outside. A pressing head is formed at an end of the branch connector, a collar is inserted behind the pressing head of the branch connector, and a nut assembled on the branch connector side is fastened to the screw. The connection structure of the branch connector in the high-pressure fuel block that fixes the branch connector to the fuel block by engaging the pressing head with the pressure receiving seat surface via the collar to fix the branch connector to the fuel block. And nuts Seal ring has a structure that is disposed between the outer peripheral surface of the inner peripheral surface and the branch connection of the mounting hole portion of Chakubuzai and the fuel block.

[0009]

According to the present invention, when the nut is fastened to the screw formed in the fitting or the screw formed in the mounting hole of the fuel block, the pressing head of the branch connecting body is connected to the main pipe via the collar. The branch connection body is easily fixed to the main pipe or the fuel block by being pressed against the pressure receiving seat surface and abuttingly engaged.

Since the seal ring is provided between the inner peripheral surface of the fastening member composed of the collar and the nut and the joint fitting or the inner peripheral surface of the mounting hole of the fuel block and the outer peripheral surface of the branch connector, Even if there is a leak on the main pipe side, the leak is stopped by the seal ring, and the leak of the fuel to the outside can be prevented, so that the supply of the high-pressure fuel is performed without any trouble.

Further, when an auxiliary seal ring is provided between the outer peripheral surface of the main pipe and the opposing surface of the joint fitting, the sealing effect is further ensured.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a side view of the embodiment, FIG. 2 is a side view including a cross section of the first embodiment, and FIGS. 3A to 3E.
FIG. 4 is an explanatory view of a main part of the second to sixth embodiments, FIG. 4 and FIG.
Is a sectional view of the seventh and eighth embodiments, and FIGS.
It is a figure which shows the Example of.

As shown in FIG. 1, a branch pipe 5 as a branch connection body is fixed at right angles to the axial direction of the main pipe 1 by a nut 7 at a joint fitting 4 portion. As shown in FIG. 2, for example, a flow passage 2 is formed in a main pipe 1 made of a relatively thick metal pipe having an outer diameter of 20 mm and a thickness of 6 mm, and a through hole 3 is formed in the flow passage 2. At the end of the through hole 3, a spherical pressure receiving seat surface 3 ′ is formed, which is enlarged and opened in the outer peripheral direction of the main pipe 1 and forms a rotation surface about the axis of the through hole 3.

A joint fitting 4 is provided around the main pipe 1 so as to surround the pressure receiving seat surface 3 ', and a screw hole 16 is formed in the joint fitting 4.

A pressing head 6 is formed at an end of the branch pipe 5 penetrating through the flow path 20, and the pressing head 6 has a rotating surface about the axis of the flow path 20 at its tip. Is formed. Behind the pressing head 6, a collar 23 is inserted through the branch pipe 5. The collar 23 is provided with a seal ring 24a between the inner peripheral surface of the joint fitting 4 and a seal ring 24b between the collar 23 and the outer peripheral surface of the branch branch pipe 5.

An example in which the pressure receiving seat surface 3 'and the pressing seat surface 18 are formed in a spherical shape will be described. However, the present invention is not limited to this, and conical surfaces, paraboloids of revolution, hyperboloids of revolution, The spheroidal surface and the like are all included in the “rotational surface”.

Further, auxiliary seal rings 25a and 25b are arranged between the outer peripheral surface of the main pipe 1 and the inner peripheral surface of the joint fitting 4.

In the embodiment shown in FIG. 2, the nut 7 is connected to the joint fitting 4.
When the screw 23 is screwed into the screw hole 16, the collar 23 presses the rear end face of the pressing head 6 by the end of the nut 7, and the pressure receiving seat surface 3 ′
Push into the side. With this pushing, the branch branch pipe 5 is airtightly assembled to the main pipe 1 with the spherical pressing seat surface 18 being in contact with the pressure receiving seat surface 3 ′, and the flow passage 2 of the main pipe 1 is connected to the branch branch pipe 5. It is branched air-tightly by the flow path 20.

The collar 23 has seal rings 24a and 24b.
Are provided, and auxiliary seal rings 25a, 25
b, the main pipe side, that is, the pressing seat surface 1
8 even if fuel leaks from between the pressure receiving seat surface 3 'and the collar 2.
Due to the seal between the outer peripheral surface of the branch pipe 5 and the inner peripheral surface of the joint fitting 4 and the seal between the outer peripheral surface of the main pipe 1 and the opposing surface of the joint fitting 4, the outflow of fuel to the outside is complete. Is prevented.

FIGS. 3A to 3E show the main parts of the second to sixth embodiments, respectively. In the second embodiment, as shown in FIG. The seal ring 24b is disposed between the inner circumferential surfaces.
Are located in the tapered seal surfaces 23 c and 7 c formed respectively at the contact portions between the collar 23 and the nut 7, and are disposed between the boundary portion between the collar 23 and the nut 7 and the outer peripheral surface of the branch branch pipe 5. Thus, a so-called "triangular seal" is formed.

In the third embodiment, as shown in FIG. 3B, a seal ring 24a is disposed between the collar 23 and the inner peripheral surface of the fitting 4 and a seal ring 24b is formed at the end of the collar 23 within the taper seal surface 23c. Is disposed between the collar 23 and the outer peripheral surface of the branch pipe 5, so-called "triangle".
To form

The fourth embodiment has the seal ring 24a as shown in FIG. 3c, located in the tapered seal surface 23c ₁ at the end of the collar 23, distribution between the inner peripheral surface of the collar 23 and the joint fittings 4 is, the seal ring 24b located tapered seal surface 23c in ₂ at the end of the collar 23, the collar 23 is disposed between the outer peripheral surface of the branch branch 5, respectively to form a so-called "triangular seal".

[0024] In the fifth embodiment As shown in Figure 3d, the seal ring 24a is, at the end of the nut 7 is located in a tapered sealing surface 7c _1, between the inner peripheral surface of the nut 7 and the joint fittings 4 provided that, the sealing ring 24b located tapered sealing surface 7c in ₂ at the end of the nut 7, is arranged between the outer peripheral surface of the nut 7 and branches pipes 5, respectively to form a so-called "triangular seal".

[0025] In the sixth embodiment, as shown in FIG. 3e, the seal ring 24a is positioned within the annular step 7d ₁ of the end portion of the nut 7, between the inner peripheral surface of the nut 7 and the joint fittings 4 The seal ring 24b is disposed on the annular step 7 at the end of the nut 7.
d ₂ , and is disposed between the nut 7 and the outer peripheral surface of the branch 5.

The construction, operation and effect of the other parts of the second to sixth embodiments are the same as those of the first embodiment already described.

FIG. 4 is a longitudinal sectional front view of a main part of a seventh embodiment. In the seventh embodiment, a branch connector is constituted by a branch fitting 5 '. This embodiment uses a branch fitting such as an elbow, a pressure equalizing valve, a damping valve, a delivery valve and a discharge valve in order to avoid interference with other parts caused by a large curvature when bending the branch branch pipe. This is made in consideration of a case where a branch metal fitting internally having a mechanism such as a valve is used.

In the seventh embodiment, the branch connecting member connected to the main pipe 1 is constituted by a branch metal fitting 5 ', and one end of the branch metal fitting 5' is provided with a spherical pressing member 6 on the pressing head 6 similarly to the above embodiment. Seat 1
8, a screw provided on the outer periphery of the nut 7 is screwed into a screw hole 16 of the fitting 4 so that the branch fitting 5 ′ is attached to the pressure receiving seat surface 3 ′ of the main pipe 1 via the washer 19 and the collar 23. The contact is engaged. On the other hand, a branch branch pipe 5 ″ fixed by screwing a cap nut 27 through a sleeve 26 is connected to the other end of the branch fitting 5 ′.

According to the seventh embodiment, the branch pipe 5 ″ can be led out in parallel with the longitudinal direction of the main pipe 1.

FIG. 5 is a vertical sectional front view of a main part of an eighth embodiment. In this embodiment, a branch branch pipe 5 which is a branch connection body is connected to a main pipe 1 by a cap nut 28. A cylindrical projection 29 is formed in the center of the cap nut 28, and as the inner peripheral screw 28 ′ of the cap nut 28 is screwed into the screw 16 ′ on the outer periphery of the joint fitting 4, the protrusion 29 is formed. The collar 23 is pressed downward through the washer 30 so that the pressing seat surface 18 is brought into contact with the pressure receiving seat surface 3 '.

FIGS. 6 and 7 are explanatory views in which the present invention is applied to a high-pressure fuel block in place of the main pipe of each embodiment, and flow paths 31, 32 through which a high-pressure fuel flows through a thick block 30.
Are formed, and the attachment holes 33a to 33a to these flow passages are formed.
33 d and 34 a to 34 d are formed in the block 30. Each of the mounting holes 33a, 34a has the pressure receiving seat surface 3 'described in each embodiment.
Screws are formed on the inner peripheral surfaces of a to 33d and 34a to 34d.

When the fuel block 30 is used, the mounting holes 33a to 33d and 34a to 34
The branch connection body is tightened and fixed to the screw on the inner circumference of the mounting hole by the tightening nut 7 with respect to d.

[0033]

[Effects of the Invention] As described in detail above, according to the present invention, the branch connection body can be air-tightly fixed to the main pipe or the fuel block by a simple operation. Even if there is a fuel leak on the fuel block side, the additional seal prevents the fuel from flowing out, and the leak and connection due to the repeated pressurization of the ultra-high pressure fuel flow and the scattering of the fuel against the vibration of the diesel internal combustion engine It is possible to provide a connection structure of a branch connection body in a high-pressure fuel manifold or a block which does not cause a part to be separated and can be applied to fuel injection of a gasoline engine.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a side view including a cross section of the first embodiment.

FIG. 3a is an explanatory view of a main part of a second embodiment.

FIG. 3b is an explanatory view of a main part of the third embodiment.

FIG. 3c is an explanatory view of a main part of a fourth embodiment.

FIG. 3d is an explanatory view of a main part of a fifth embodiment.

FIG. 3e is an explanatory view of a main part of a sixth embodiment.

FIG. 4 is a longitudinal sectional view of a main part of a seventh embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a main part of an eighth embodiment.

FIG. 6 is a perspective view of a ninth embodiment.

FIG. 7 is a sectional view showing an assembled state of FIG. 6;

FIG. 8 is a sectional side view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main pipe 2 Flow path 3 Through-hole 3 'Pressure receiving surface 4 Joint fitting 5 Branch branch pipe 6 Pressing head 7 Nut 16 Screw hole 18 Pressing seating surface 20 Flow path 23 Collar 24a, 24b Seal ring 25a, 25b Auxiliary seal ring

Claims (3)

(57) [Scope of request for utility model registration] 1. A through-hole is formed at a plurality of positions in an axial direction in a peripheral wall of a flow passage formed in the main pipe and through which high-pressure fuel flows, and the through-hole has a flow passage communicating with the flow passage. A pressure receiving seat surface is formed in the circumferential direction of the main pipe so as to be extended so as to be connected to the branch connection body. A screw fitting is provided on the joint fitting provided around the pressure receiving seat surface with respect to the main pipe. Is formed, a pressing head is formed at the end of the branch connector, a collar is inserted behind the pressing head of the branch connector, and a nut assembled on the branch connector side is fastened to the screw. By attaching, the connection structure of the branch connecting body in the high-pressure fuel manifold fixing the branch connecting body to the main pipe by abuttingly engaging the pressing head with the pressure receiving seat surface via the collar, A fastening member comprising the collar and the nut and the joint fitting A connection structure for a branch connector in a high-pressure fuel manifold, wherein a seal ring is provided between an inner peripheral surface of the fuel cell and an outer peripheral surface of the branch connector. 2. The connection structure according to claim 1, wherein an auxiliary seal ring is further provided between an outer peripheral surface of the main pipe and an opposing surface of the joint fitting. 3. A through-hole is formed at a plurality of positions in an axial direction on a peripheral wall of a flow passage formed in a fuel block in which a high-pressure fuel flows in an axial direction, and the through-hole has a flow passage communicating with the flow passage. The fuel block has an enlarged pressure receiving seat surface formed in the fuel block so as to be continuously provided, and a screw is formed in a mounting hole portion extending from the pressure receiving seat surface to the outside. A pressing head is formed in the portion, a collar is inserted behind the pressing head of the branch connector, and a nut assembled on the branch connector side is fastened to the screw, so that the collar is inserted through the collar. In a connection structure of a branch connector in a high-pressure fuel block for fixing the branch connector to the fuel block by bringing a pressing head into contact with the pressure receiving seat surface, a fastening member comprising a collar and a nut is provided. Fuel block removal A connection structure for a branch connector in a high-pressure fuel block, wherein a seal ring is provided between an inner peripheral surface of a perforated portion and an outer peripheral surface of the branch connector.