JP2021116800A - Assembling device of fuel rail for gasoline direct-injection engine - Google Patents

Abstract

To provide an assembling device of a fuel rail for a gasoline direct-injection engine capable of improving assembling accuracy of an injector holder in a manufacturing process of the fuel rail for the gasoline direct-injection engine.SOLUTION: A concave jig obtained by assembling a fluid pressure cylinder for assembling an injector holder and an injector holder fixing jig, is horizontally supported in a manner of being slightly movable forward and backward in an injector holding pressing direction, and a main pipe rail is supported on a rail pedestal through which a concave jig bottom portion is vertically penetrated, through a temporary bonding electrode. An injector holder position adjustment mechanism is disposed to align a center of a circular arc-shaped concave portion for bonding the injector holder, to a center of the rail body by slightly moving the concave jig forward and backward in the injector holder pressing direction in assembling the injector holder.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fuel rail for supplying high-pressure fuel supplied from a fuel pressurizing pump such as an electronic fuel injection type automobile engine via a fuel injector that injects directly into the cylinder of the engine. It relates to a device for assembling an injector holder (cylindrical socket) to a rail body in a manufacturing process of a fuel rail for a gasoline direct injection engine in which fuel is directly supplied from an injector to an injector.

Conventionally, as a fuel rail for this type of gasoline direct injection engine, for example, the one described in Patent Document 1 below is known. In Patent Document 1, for example, as shown in FIG. 2, a fuel for a gasoline direct injection engine provided with a plurality of injector holders (cylindrical sockets) 12 and fixing brackets 13 on a main rail 11 which is a fuel rail main body. The rails are listed. In the figure, 14 is a pressure sensor boss, 15 is a plug, and 16 is an inlet collector.
In this fuel rail for a gasoline direct injection engine, the injector holder 12 is provided with finishing holes 12-1 and lateral holes 12-2 by cutting, as shown in FIG. The main pipe is formed in the arcuate concave portion 12-3 for joining the injector holder formed in the portion of the through hole 11-2 formed in the peripheral wall portion of the cylindrical main rail 11 formed as the flow passage 11-1 in the axial direction. It is brazed to and joined with the rail 11. 11-1a is an inner peripheral wall surface.

In the manufacturing process of the fuel rail for a gasoline direct injection engine, when the injector holder 12 is assembled to the main body of the main rail 11, the injector holder 12 is attached to the fluid pressure cylinder by a dedicated assembling fluid pressure cylinder (air cylinder or the like). The holder is temporarily attached by a projection welding machine with the holder fixed by pressing it against a fixing jig installed on the opposite side of the cylinder. Specifically, the arcuate concave portion 12-3 for joining the injector holder 12 is brought into contact with the peripheral wall portion of the main rail 11, and the holder is temporarily attached by a projection welding machine in a state of being fixed by a fluid pressure cylinder. After this temporary fixing and fixing, the main rail 11 is integrally brazed and fixed by brazing in the furnace.

Japanese Unexamined Patent Publication No. 2010-7651

However, the conventional assembly method using a fluid pressure cylinder for assembly for temporarily attaching and welding the injector holder to the main rail has the problems described below.
That is, in the conventional assembly method in which the injector holder is temporarily attached by a projection welding machine while being pressed against a fixing jig installed on the opposite side of the cylinder by a dedicated fluid pressure cylinder for assembly, the injector holder is clamped. In the completely fixed state, that is, the reference surface (fixing jig side) of the injector holder is pressed and fixed by the fluid pressure cylinder, and the pressing direction cannot be slightly adjusted. If there is processing variation, it is not possible to absorb misalignment in the joining of the parts, and as a result, the parts are temporarily attached with the tolerances remaining, and the distortion after assembling the injector holder increases and the assembly accuracy becomes large. There was a problem that it was not possible to secure a sufficient amount.

The present invention has been made to solve the above-mentioned problem that the distortion after assembling the injector holder of the conventional fuel rail for a gasoline direct injection engine becomes large and the assembling accuracy cannot be sufficiently ensured. An injector holder position adjustment mechanism (a mechanism that matches the center of the arc plane recess for joining the injector holder with the center of the rail body) is attached to the assembly method using the fluid pressure cylinder for assembly to absorb the processing variation of the injector holder with respect to the rail body. By doing so, it is an object of the present invention to provide an assembling device for a fuel rail for a gasoline direct injection engine, which can improve the assembling accuracy of the injector holder.

The fuel rail assembling device for a gasoline direct injection engine according to the present invention has a fluid pressure cylinder for assembling the injector holder and a jig having an injector holder fixing jig installed on the opposite side of the cylinder before and after the injector holder pressing direction. The injector holder is provided so that it can be finely moved to absorb the processing variation of the injector holder. The gist is that the injector holder is temporarily pressed against the holder fixing jig by the assembly fluid pressure cylinder. An injector holder assembling device for a fuel rail for a gasoline direct injection engine to be attached, and a concave jig incorporating the injector holder assembling fluid pressure cylinder and an injector holder fixing jig installed on the opposite side of the cylinder. Is horizontally supported so that it can be finely moved back and forth in the direction of pressing the injector holder, and the main rail is supported via a temporary mounting electrode on a rail cradle that stands vertically so as to penetrate the bottom of the concave jig. At the same time, the concave jig has an injector holder position adjusting mechanism that slightly moves back and forth in the injector holder pressing direction to match the center of the arcuate concave portion for joining the injector holder with the center of the rail body.

In the present invention, the injector holder position adjusting mechanism for matching the center of the arcuate concave portion for joining the injector holder with the center of the rail body is provided for the reason described below.
That is, in the conventional method in which the injector holder is temporarily attached to the rail body while being pressed against the holder fixing jig by the assembling fluid pressure cylinder, the reference surface (fixing jig side) of the injector holder is pressed by the fluid pressure cylinder. Temporary attachment is performed in a state where it is fixed and the pressing direction cannot be slightly adjusted, and it is not possible to absorb misalignment due to processing variation in the circumferential direction of the injector holder with respect to the rail body, and as a result, it is desired. It will be temporarily attached with a deviation from the dimensions to be used. For this reason, as a mechanism in the direction of holding the injector holder, a structure having an injector holder position adjusting mechanism that matches the center of the arcuate concave portion for joining the injector holder with the center of the rail body is used to vary the processing of the injector holder with respect to the rail body. This is so that the misalignment caused by the above can be absorbed.

The fuel rail assembly device for a gasoline direct injection engine according to the present invention has an injector holder position adjustment mechanism that aligns the center of the arc-shaped recess for joining the injector holder with the center reference of the rail body. By accurately absorbing the eccentricity) and assembling the injector holder to the rail body, when assembling the injector holder to the rail body, it is possible to accurately absorb the displacement caused by the processing variation of the injector holder with respect to the rail body. This makes it possible to improve the positional accuracy of the injector holder, so that the assembly accuracy of the rail body and the injector holder can be significantly improved.

It is a schematic diagram which shows one Example of the assembly device of the fuel rail for a gasoline direct injection engine which concerns on this invention partially broken. It is a top view which shows an example of the fuel rail for a direct injection gasoline engine of the same above. FIG. 2 is an enlarged cross-sectional view taken along the line AA.

In the fuel rail assembly device for a gasoline direct injection engine shown in FIG. 1, 1 is a machine base, 2 is a support, 3 is a concave jig, 4 is a fluid pressure cylinder, 5 is an injector holder fixing jig, and 6 is an injector holder fixing jig. Main rail cradle, 7 is an electrode, 8 is an injector holder position adjusting mechanism, 9 is a concave jig support base, and 10 is a concave jig holder.

That is, in the fuel rail assembling device for a gasoline direct injection engine shown in FIG. 1 according to the present invention, the injector holder 12 is installed on the opposite side of the fluid pressure cylinder by a dedicated assembling fluid pressure cylinder (air cylinder or the like) 4. Instead of the conventional method in which the holder is pressed against the injector holder fixing jig 5 and temporarily attached by a projection welder while the holder is fixed, a fluid pressure cylinder 4 and an injector holder fixing jig 5 are provided, and a book is provided in the recess. A concave jig 3 having a structure that supports the pipe rail 11 and the injector holder 12 is adopted, and the concave jig 3 slightly moves back and forth in the direction of pressing the injector holder to refer to the center of the main body of the main rail 11. It is characterized in that P1 is provided with an injector holder position adjusting mechanism (adjustment mechanism) 8 that matches the center P2 of the arcuate surface recess 12-3 for joining the injector holder.

Here, the device of the present invention will be described more specifically. In the fuel rail assembly device for a gasoline direct injection engine shown in FIG. 1, a fluid pressure cylinder 4 is provided on the outer surface of one vertical wall 3-1 and the other is vertical. The injector holder fixing jig 5 is provided on the inner surface of the wall 3-2, and the main rail 11 and the injector holder 12 are supported in the recess 3-3 between the vertical walls 3-1 and 3-2. The concave jig 3 is horizontally supported by the concave jig support base 9 so as to be finely moved back and forth in the injector holder pressing direction via the injector holder position adjusting mechanism (adjustment mechanism) 8. The injector holder fixing jig 5 is detachably attached to the vertical wall 3-2 so as to fit and support the reference surface side of the injector holder 12, and is attached to the tip of the rod 4-1 of the fluid pressure cylinder 4. The injector holder 12 is pressed through the body 4-2.

In the injector holder position adjusting mechanism 8, the convex portion 9-1 formed on the upper surface of the concave jig support base 9 can move back and forth in the injector holder pressing direction in the concave portion 8-1 formed on the bottom surface of the concave jig 3. This book has a structure in which the injector holder is fitted in a concavo-convex manner, and is vertically erected on a support 2 fixed to the machine base 1 so as to penetrate the bottom of the recess of the concave jig 3 adjacent to the injector holder position adjusting mechanism 8. The main rail 11 is supported on the pipe rail pedestal 6 via a temporary attachment electrode 7. The through hole 3-4 of the main rail pedestal 6 formed in the bottom of the recess of the concave jig 3 is formed to match the arc plane recess center P2 for joining the injector holder with the rail body center reference P1. The jig has a size that allows fine movement in the direction of pressing the injector holder. Further, in the concave jig 3, the portion of the vertical wall 3-2 is held by the concave jig holder 10 attached to the support 2 fixed to the machine base 1 via the guide rod 10-1. ing. The concave jig support base 9 is supported so that the concave jig 3 can be set at a predetermined height position by an elevating mechanism (not shown) such as a fluid pressure cylinder so that the height can be adjusted.

When assembling the injector holder 12 to the main body of the main rail 11 by the fuel rail assembling device for a gasoline direct injection engine having the above configuration, the concave jig 3 is held at a predetermined height position and the main rail receiver is received. The main rail 11 is placed and fixed at a predetermined height position by the base 6 via the electrode 7, and is attached to the injector holder fixing jig 5 mounted on the inner surface of the vertical wall 3-2 of the concave jig 3. The injector holder 12 whose reference surface side is unevenly fitted is pressed by the fluid pressure cylinder 4. At this time, if the position of the center P2 of the arc-shaped concave portion 12-3 for joining the holder of the injector holder 12 deviates from the center reference P1 of the main body of the main rail 11, the injector holder position adjusting mechanism 8 corrects the concave shape. The tool 3 is slightly moved by the displacement, and the component tolerance is absorbed. That is, the main rail 11 and the injector holder 12 are temporarily attached in a state where the center P1 of the arc plane recess 12-3 for joining the holder of the injector holder 12 coincides with the center reference P1 of the main body of the main rail 11. , The assembly accuracy of the main rail 11 and the injector holder 12 is improved.

The fuel rail assembly device for a gasoline direct injection engine according to the present invention joins the injector holder 12 in order to ensure the positional accuracy of the injector holder 12 when the injector holder 12 is brazed to the main rail 11. Needless to say, it can also be applied to an injector holder in which a plurality of temporary attachment protrusions (drawings omitted) are provided in the recesses 12-3. Further, as an injector holder having the temporary attachment protrusions, four temporary attachment protrusions are placed in a cross position in the holder joining recess, and specifically, two protrusions are positioned parallel to the axial direction of the rail body. Injector holders (drawings omitted) provided with the remaining two protrusions at the edges of the holder joining recesses 12-3 located at right angles to the axial direction of the rail body are assembled to the bottom of the holder joining recesses 12-3. It is very effective in improving accuracy.

1 Machine stand 2 Support 3 Concave jig 3-1, 3-2 Vertical wall 3-3 Recess 3-4 Through hole 4 Fluid pressure cylinder 4-1 Rod 4-2 Presser body 5 Injector holder fixing jig 6 Tube rail cradle 7 Electrode 8 Injector holder position adjustment mechanism 8-1 Concave 9 Concave jig support 9-1 Convex 10 Concave jig holder 10-1 Guide rod 11 Main rail 12 Injector holder 12-3 Injector holder joining arc-shaped recess P1 Main rail rail body center reference P2 Injector holder joining arc-shaped recess center

Claims (1)

An injector holder assembling device for a fuel rail for a gasoline direct injection engine in which the injector holder is temporarily attached to the rail body while being pressed against the holder fixing jig by a fluid pressure cylinder for assembling. A concave jig incorporating an injector holder fixing jig installed on the opposite side of the cylinder and the hydraulic pressure cylinder is horizontally supported so as to be able to move slightly back and forth in the direction of pressing the injector holder, and penetrates the bottom of the concave jig. The main rail is supported by a temporary mounting electrode on a vertically erected rail cradle, and the concave jig moves slightly back and forth in the injector holder pressing direction to join the injector holder to the center of the rail body. A fuel rail assembly device for a gasoline direct injection engine, characterized by having an injector holder position adjusting mechanism that matches the center of an arcuate concave portion.

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