JPH04110295U - Connection structure of branch connections in high pressure fuel manifolds or blocks - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention provides a connection structure for branch connections in high-pressure fuel manifolds or blocks that prevents scattering of ultra-high-pressure fuel and incomplete connections without welding or brazing. [Structure] Connect and fix the branch connector side by tightening it to the joint fitting or fuel block fitted externally on the main pipe. A seal ring is provided on a collar inserted behind the pressing head of the branch connection body, and seals the outer peripheral surface of the branch connection body and the inner peripheral surface of the attachment hole of the joint fitting or fuel block. [Effect] Even if there is a fuel leak on the main pipe or fuel block side, the seal ring prevents the fuel from flowing out.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a connection structure for branch connections such as branch pipes and branch fittings in a high-pressure fuel manifold or block, and is used not only for fuel injection of gasoline engines, but also for fuel supply paths of 1000 kgf/cm2 ^or more in particular. The present invention relates to a connection structure for a branch connection in a high-pressure fuel manifold to a diesel internal combustion engine.

0002

[Conventional technology]

Figure 8 shows the connection structure of a branch pipe as a branch connection body in a conventional high-pressure fuel manifold. 2 is a side view including a cross-sectional portion showing a flow passage 10 through which high-pressure fuel flows through a main pipe 11. is formed, and a plurality of through holes 13 are formed in the axial direction with respect to the flow path 10. (Only one through hole 13 is shown in FIG. 8).

0003 A branch pipe 14 is inserted into each through hole 13, and the branch pipe 14 and the main pipe 11 are connected to each other. is fixed by means of brazing or welding at the connecting part w, and is branched from the flow path 10 of the main pipe 11. The flow path 12 of the branch pipe 14 is in communication with the branch pipe 14 .

0004

[Problem that the idea aims to solve]

In the connection structure of the branch connection body in the conventional high-pressure fuel manifold mentioned above, ultra-high pressure flow of 1000 kgf/ ^cm2 or more is repeatedly supplied, and furthermore, vibrations are applied from the diesel internal combustion engine, resulting in cracks in the connection part w. In some cases, leakage may occur due to fuel scattering, or the branch pipe 14 may become detached.

[0005] The present invention was developed in view of the current state of the connection structure of this type of branch connection body as described above. The purpose is to easily connect branch connections to main or combustion pipes without welding or brazing. It can be connected to the fuel block to prevent fuel from leaking to the outside. The seal is completely sealed, and it is not necessary to repeatedly supply ultra-high pressure flow or to a diesel internal combustion engine. high-pressure fuel manifolds or blocks where vibrations from vibrations will not cause incomplete connections. The object of the present invention is to provide a connection structure for a branch connection body.

[0006]

[Means to solve the problem]

In order to achieve the above object, a first embodiment of the present invention includes a main pipe formed in the axial direction. Through holes are formed at multiple positions in the axial direction on the peripheral wall of the flow passage through which the high-pressure fuel flows. and a branch connection body having a flow path communicating with the communication hole is connected to each of the through holes. A pressure-receiving seat surface is formed with an enlarged opening in the circumferential direction of the main pipe, and A screw is formed in the joint metal fitting provided surrounding the pressure receiving surface, and the joint fitting is provided to surround the pressure receiving surface. A pressing head is formed at the end of the connecting body, and a collar is formed behind the pressing head of the branch connecting body. - is inserted, and the nut assembled on the branch connection body side is tightened to the screw. Then, the pressing head is brought into abutting engagement with the pressure receiving surface through the collar, and the branching In the connection structure of the branch connection body in the high pressure fuel manifold, which fixes the connection body to the main pipe. and the fastening member consisting of the collar and nut, the inner circumferential surface of the joint fitting, and the A seal ring is arranged between the outer peripheral surfaces of the branch connection body.

[0007] In addition, the second embodiment of the present invention has the structure of the first embodiment in addition to the outer periphery of the main pipe. An auxiliary seal ring is arranged between the face and the facing face of the joint fitting.

[0008] Furthermore, a third embodiment of the present invention includes a high pressure fuel axially formed within the fuel block. Through holes are formed at multiple positions in the axial direction in the peripheral wall of the flow path through which the material flows, and the through holes The branch connectors each having a flow path communicating with the flow path are connected to the A pressure-receiving seat with an enlarged opening is formed in the fuel block, and a mounting is connected to the outside from the pressure-receiving seat. A screw is formed in the hole portion, a pressing head is formed in the end of the branch connection body, and the A collar is inserted behind the pressing head of the branch connection body and incorporated into the branch connection body side. By tightening the soldered nut onto the screw, the pressing head can be moved forward through the collar. a height that abuts and engages the pressure-receiving bearing surface to fix the branch connection body to the fuel block; In the connection structure of the branch connection body in the pressure fuel block, the collar and the nut a fastening member, an inner circumferential surface of the mounting hole of the fuel block, and a fastening member of the branch connector. It has a configuration in which a seal ring is disposed between the outer peripheral surfaces.

[0009]

[Effect]

The present invention uses the nut to attach to the screw formed in the fitting or to the mounting hole of the fuel block. When tightened to the screw formed in the part, the pressing head of the branch connection body will be The branch connection body is pressed against the pressure receiving surface of the main pipe and engages with it, and the branch connection body is connected to the main pipe or fuel block. It is easily fixed in place.

0010 The fastening member consisting of the collar and nut and the inner circumferential surface of the fitting or the attachment of the fuel block. A seal ring is placed between the inner circumferential surface of the hole and the outer circumferential surface of the branch connection body. Even if there is a leak on the main pipe side, the seal ring will stop it and prevent fuel from leaking to the outside. High-pressure fuel can be supplied without any problems.

[0011] Furthermore, if an auxiliary seal ring is placed between the outer peripheral surface of the main pipe and the opposing surface of the fitting, Moreover, the sealing effect is more reliable.

0012

【Example】

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 7.

[0013] Here, FIG. 1 is a side view of the embodiment, and FIG. 2 is a side view including a cross section of the first embodiment. , FIGS. 3a to 3e are explanatory diagrams of main parts of the second to sixth embodiments, and FIGS. 4 and 5 are illustrations of the main parts of the second to sixth embodiments. 6 and 7 are cross-sectional views of the seventh and eighth embodiments, and FIGS. 6 and 7 are diagrams showing the ninth embodiment.

[0014] As shown in FIG. 1, a branch branch pipe 5 as a branch connection body is provided at right angles to the axial direction of the main pipe 1. is tightened by a nut 7 at the joint fitting 4 portion. As shown in Figure 2 For example, the main pipe 1 is made of a relatively thick metal pipe with an outer diameter of 20 mm and a wall thickness of 6 mm. A flow path 2 is formed, a through hole 3 is formed in the flow path 2, and a through hole 3 is formed at the end of the through hole 3. is a sphere that expands in the direction of the outer circumference of the main pipe 1 and forms a rotating surface around the axis of the through hole 3. A planar pressure receiving surface 3' is formed.

[0015] A joint fitting 4 is provided surrounding the pressure receiving surface 3' for the main pipe 1. 4 has a screw hole 16 formed therein.

[0016] A pressing head 6 is formed at the end of the branch pipe 5 extending through the flow path 20, and the pressing head 6 is The head 6 has a spherical pressing surface that forms a rotating surface around the axis of the flow path 20 at the tip. 18 are formed. Behind the pressing head 6, the collar 23 connects to the branch pipe 5. It is inserted. This collar 23 has a seal ring between it and the inner peripheral surface of the fitting 4. 24a, and a seal ring 24b is disposed between the branch pipe 5 and the outer circumferential surface of the branch pipe 5. Ru.

[0017] In addition, an example in which the pressure receiving surface 3' and the pressing surface 18 are formed in a spherical shape will be described. However, this specification is not limited to this, and includes a conical surface, a parabola of revolution, a hyperbola of revolution. Surfaces, spheroidal surfaces, etc. are all included in the "surface of rotation".

[0018] Furthermore, an auxiliary seal ring 25a is provided between the outer peripheral surface of the main pipe 1 and the inner peripheral surface of the joint fitting 4. , 25b are arranged.

[0019] In the embodiment of FIG. 2, when the nut 7 is screwed into the screw hole 16 of the fitting 4, the nut The collar 23 presses the rear end surface of the pressing head 6 by the end of 7 and moves toward the pressure receiving surface 3' side. Push it in. By this pushing, the spherical pressing bearing surface 18 comes into contact with the pressure receiving bearing surface 3'. In this state, the branch pipe 5 is airtightly assembled to the main pipe 1, and the flow path 2 of the main pipe 1 is branched. The flow path 20 of the branch pipe 5 branches airtightly.

[0020] Seal rings 24a and 24b are arranged on the collar 23, and an auxiliary seal is placed on the fitting 4. Since the rings 25a and 25b are arranged, in the unlikely event that the main pipe side, that is, the pressing seat surface 18 Even if fuel leaks between the pressure receiving surface 3', the outer peripheral surface of the collar 23 and the branch pipe 5 and A seal between the inner circumferential surface of the fitting 4, and a seal between the outer circumferential surface of the main pipe 1 and the facing surface of the fitting 4. The leakage of fuel to the outside is completely prevented by the seal between the two.

[0021] 3a to 3e respectively show the main part configurations of the second to sixth embodiments. In the embodiment shown in FIG. 3a, the seal ring 24a is connected to the collar 23. The seal ring 24b is arranged between the inner circumferential surface of the metal fitting 4, and the seal ring 24b is arranged between the collar 23 and the nut 7. Located within the tapered seal surfaces 23c and 7c formed at the opposing portions, respectively. , arranged between the boundary between the collar 23 and the nut 7 and the outer peripheral surface of the branch pipe 5, Form a loose "triangular seal".

[0022] In the third embodiment, as shown in FIG. 3b, the seal ring 24a is connected to the collar 23. The seal ring 24b is disposed between the inner circumferential surfaces of the metal fitting 4, and the seal ring 24b is disposed between the inner peripheral surfaces of the metal fitting 4. - Located within the seal surface 23c and arranged between the collar 23 and the outer peripheral surface of the branch pipe 5. This forms a so-called "triangular rule."

In the fourth embodiment, as shown in FIG. 3c, the seal ring 24a is located within the tapered sealing surface _23c1 at the end of the collar 23, and is disposed between the collar 23 and the inner peripheral surface of the fitting 4. The seal ring 24b is located within the tapered sealing surface _23c2 at the end of the collar 23, and is disposed between the collar 23 and the outer peripheral surface of the branch pipe 5, forming a so-called "triangular seal".

In the fifth embodiment, as shown in FIG. 3d, the seal ring 24a is located within the tapered seal surface _7c1 at the end of the nut 7, and is located between the nut 7 and the inner peripheral surface of the fitting 4. The seal ring 24b is located within the tapered sealing surface _7c2 at the end of the nut 7, and is disposed between the nut 7 and the outer peripheral surface of the branch pipe 5, forming a so-called "triangular seal".

In the sixth embodiment, as shown in FIG. 3e, the seal ring 24a is located within the annular step 7d1 at the end of the nut 7, and the seal ring _24a is located between the nut 7 and the inner peripheral surface of the fitting 4. The seal ring 24b is located within the annular step _7d2 at the end of the nut 7, and is disposed between the nut 7 and the outer peripheral surface of the branch pipe 5.

[0026] The configurations and effects of other parts of these second to sixth embodiments have already been described. This is the same as the first embodiment described.

[0027] Next, FIG. 4 is a longitudinal sectional front view of the main part of the seventh embodiment. The branch connection body is constituted by a branch fitting 5'. This example is for bending branch pipes. In order to avoid interference with other parts caused by large curvature, When using branch fittings such as This was done in consideration of cases where a branch fitting is used.

[0028] In the seventh embodiment, the branch connection body connected to the main pipe 1 is composed of a branch fitting 5', At one end of the branch fitting 5', a spherical pressing seat surface 18 is provided on the pressing head 6 as in the previous embodiment. The screw provided on the outer periphery of the nut 7 is screwed into the screw hole 16 of the joint fitting 4. Then, attach the branch fitting 5' to the pressure receiving surface 3' of the main pipe 1 via the washer 19 and collar 23. They are brought into abutting engagement. On the other hand, a cap nut is attached to the other end of the branch fitting 5' via a sleeve 26. The branch pipe 5'' which is fixed by screwing the joint 27 is connected. There is.

[0029] According to this seventh embodiment, branch pipes 5'' are led out parallel to the longitudinal direction of the main pipe 1. can be done.

[0030] FIG. 5 is a longitudinal sectional front view of the main part of the eighth embodiment, and this embodiment has a cap nut 28. A branch pipe 5, which is a branch connection body, is connected to the main pipe 1. This cap nut 2 8 has a cylindrical protrusion 29 formed in the center, and the inner circumferential screw 2 of the cap nut 28 8' is screwed onto the screw 16' on the outer periphery of the fitting 4, the protrusion 29 The collar 23 is pressed downward via the washer 30 to turn the pressing seat surface 18 into the pressure receiving surface 3'. This is for abutting and engaging.

[0031] Figures 6 and 7 show the present invention applied to a high-pressure fuel block instead of the main pipe in each embodiment. It is an explanatory diagram, and the flow passages 31 and 32 through which high-pressure fuel flows through the thick block 30 are shaped like The mounting holes 33a to 33d, 34a to 34d communicating with these flow passages are It is formed in the lock 30. These mounting holes 33a..., 34a... The pressure receiving surface 3' explained in the example is formed, and the mounting holes 33a to 33d, 34a to A screw is formed on the inner peripheral surface of 34d.

[0032] When using this fuel block 30, each mounting hole 33a to 33 Tighten the branch connection body to the screw on the inner periphery of the mounting hole for d and 34a to 34d and tighten the nut 7. Tighten and secure.

[0033]

[Effect of the idea]

As explained in detail above, according to the present invention, for the main pipe or fuel block, Branch connections can be airtightly fixed with simple work, and in the unlikely event that the main pipe or Even if there is a fuel leak on the fuel block side, an additional seal will prevent the fuel from exiting. Prevents spills and protects against repeated pressurization of ultra-high pressure fuel streams and vibrations of diesel internal combustion engines. This eliminates the possibility of leakage or disconnection of connections due to fuel splashing, etc., and eliminates gasoline exhaust. Branch connection in high-pressure fuel manifolds or blocks, also applicable to engine fuel injection It can provide a connecting structure for the body.

[Brief explanation of 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 diagram of main parts of a second embodiment.

FIG. 3b is an explanatory diagram of main parts of a third embodiment.

FIG. 3c is an explanatory diagram of main parts of a fourth embodiment.

FIG. 3d is an explanatory diagram of main parts of the fifth embodiment.

FIG. 3e is an explanatory diagram of main parts of a sixth embodiment.

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

FIG. 5 is a vertical cross-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 the assembled state of FIG. 6;

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

[Explanation of symbols]

1 main 2 Distribution path 3 Through hole 3' Pressure bearing surface 4 Fittings 5 Branch pipe 6 Pressing head 7 Nut 16 Screw hole 18 Pressure bearing surface 20 Flow path 23 Color 24a, 24b seal ring 25a, 25b Auxiliary seal ring

Claims (3)

[Scope of utility model registration request] 1. Through holes are formed at a plurality of positions in the axial direction in the peripheral wall of a flow passage formed in the axial direction in the main pipe and through which high-pressure fuel flows, and each of the through holes has a flow passage communicating with the flow passage. A pressure-receiving seat is formed with an enlarged opening in the circumferential direction of the main pipe so that the branch connectors are connected, and a joint fitting provided to the main pipe surrounding the pressure-receiving seat is screwed. is formed, a pressing head is formed at the end of the branch connecting body, a collar is inserted behind the pressing head of the branch connecting body, and a nut assembled on the side of the branch connecting body is tightened to the screw. In the connection structure of a branch connection body in a high-pressure fuel manifold, the branch connection body is fixed to the main pipe by attaching the pressure head to the pressure receiving surface through a collar and fixing the branch connection body to the main pipe, Connection of a branch connection body in a high-pressure fuel manifold, characterized in that a seal ring is disposed between the fastening member consisting of the collar and nut, the inner peripheral surface of the joint fitting, and the outer peripheral surface of the branch connection body. structure. 2. The connection structure according to claim 1, further comprising an auxiliary seal ring disposed between the outer peripheral surface of the main pipe and the opposing surface of the joint fitting. 3. Through holes are formed at a plurality of positions in the axial direction in the peripheral wall of a flow passage formed in the axial direction in the fuel block and through which high-pressure fuel flows, and each of the through holes has a flow passage connected to the flow passage. A pressure receiving surface with an enlarged opening is formed in the fuel block so that the branch connecting body having the branch connecting body is connected to the fuel block, and a screw is formed in a mounting hole extending from the pressure receiving surface to the outside, and a screw is formed in the mounting hole extending from the pressure receiving surface to the outside. A pressing head is formed in the branch connecting body, a collar is inserted behind the pressing head of the branch connecting body, and by tightening a nut assembled on the branch connecting body side to the screw, the In the connection structure of a branch connection body in a high-pressure fuel block, in which the pressure head is brought into abutting engagement with the pressure receiving surface and the branch connection body is fixed to the fuel block, the fastening member consisting of the collar and the nut; A connection structure for a branch connection body in a high-pressure fuel block, characterized in that a seal ring is disposed between an inner circumferential surface of a mounting hole of the fuel block and an outer circumference of the branch connection body.