JPH0573383U - Double tube fuel tube support structure for diesel engine - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention relates to a support structure for a double-pipe fuel pipe for a diesel engine, and particularly to provide a support structure for a fuel pipe that can directly support a high-pressure inner pipe. [Structure] A thick high-pressure inner pipe 2 and a bellows pipe 3 arranged outside the inner pipe 2 constitute a double-pipe fuel pipe for a diesel engine, and support for directly supporting the high-pressure inner pipe 2 The bracket 4 is provided with a V-shaped groove 4b capable of receiving the high-pressure inner pipe 2, and the bracket 4 is attached to the receiving bracket 4 with a tightening bolt 5a and cooperates with the V-shaped groove 4a. The support constituted by the clamp 5 having the V-shaped groove 5b capable of holding the tube 2 directly supports the high-pressure inner tube 2 and greatly reduces the vibration stress of the fuel tube.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a double-tube fuel pipe support structure for a diesel engine, and more particularly to a fuel pipe support structure capable of directly supporting a high-pressure inner pipe.

[0002]

[Prior Art]

 Generally, in a large-sized diesel engine such as a marine engine, a fuel pipe connecting a fuel injection pump and a fuel injection valve (the fuel injection valve is mounted near the top of each cylinder of the diesel engine) (for safety and Double pipe type is used (for legal reasons).

That is, in FIGS. 5 and 6, the fuel injection pump 11 and the fuel injection valve 12 of the large-sized diesel engine 10 are connected by the fuel pipe 13, and the high-pressure fuel generated in the fuel injection pump 11 is connected to the fuel pipe 13. Is supplied to each fuel injection valve 12 via. Reference numeral 14 indicates a branch hardware.

Here, as shown in FIG. 6, the fuel pipe 13 includes a thick high-pressure inner pipe 13a and an outer pipe 13c concentrically arranged outside the high-pressure inner pipe 13a with a gap 13b therebetween. It is composed of a double pipe structure.

The fuel pipe 13 has a support bracket attached to the main body of the diesel engine 10 with U bolts 18 at a substantially middle portion of the fuel pipe 13 from the outside with a pair of split steel pipes 16 interposed by a cushion rubber 17. It has been tightened to 15 and is being supported.

[0006]

[Problems to be solved by the device]

 As described above, the support of the fuel pipe is performed by tightening the split steel pipe with U bolts from the outer side of the outer pipe with the cushioning rubber interposed, but there is a gap between the inner pipe and the outer pipe. Therefore, when the inner pipe receives a high pulsating pressure delivered from the injection pump, vibration stress is generated, which causes a breakage of the inner pipe.

On the other hand, the recent diesel engine as a marine main engine has a tendency to have a long stroke, and the fuel pipe is also lengthened accordingly, so that the above problem becomes more serious.

The present invention is intended to solve such a problem, and a double-tube fuel pipe is provided with a thick high-pressure inner pipe and a bellows pipe arranged outside the inner pipe. An object of the present invention is to provide a double-pipe fuel pipe support structure for a diesel engine, which has a heavy pipe structure and can support the above high-pressure inner pipe to a support bracket through a support body that can directly hold it. ..

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the double-tube fuel pipe support structure for a diesel engine of the present invention comprises a thick high-pressure inner pipe and an outer pipe arranged outside the high-pressure inner pipe. In the double-tube type fuel pipe support structure for a diesel engine, the outer pipe is composed of a bellows pipe, and a peeling portion is formed in the bellows pipe, and the bellows pipe is inserted through the peeling portion to the high pressure side. It has a high-pressure inner pipe support capable of directly supporting the inner pipe, and the high-pressure inner pipe support is attached to a support bracket mounted on the diesel engine to form a V-shaped groove capable of receiving the high-pressure inner pipe. And a tightening fitting which is fastened to the receiving fitting with a tightening bolt and which is formed with a V-shaped groove capable of holding the high-pressure inner pipe in cooperation with the V-shaped groove. It is a feature.

[0010]

[Action]

 In the above-mentioned double-tube fuel pipe support structure for a diesel engine of the present invention, the high-pressure inner pipe of the double-tube fuel pipe is formed by the V-shaped groove formed in the receiving metal fitting and the V-shaped groove formed in the fastening metal fitting. Can be directly supported.

Further, by tightening the tightening bolt, it is possible to perform additional tightening using the inclined surfaces of both V-shaped grooves.

[0012]

【Example】

 Referring to the drawings, a double-tube fuel pipe support structure for a diesel engine as one embodiment of the present invention will be described below. FIG. 1 is a plan sectional view, FIG. 2 is a side sectional view, FIG. 3 is a front view, and FIG. It is a partial cross-sectional side view which shows arrangement | positioning of a fuel pipe. 1 to 4, the same reference numerals as those in FIGS. 5 and 6 indicate substantially the same members.

The fuel pipe 1 of this embodiment also connects the fuel injection pump 11 and the fuel injection valve 12 attached to the diesel engine 10, and the fuel pipe 1 has a thick high-pressure inner pipe 2 and an outer side thereof. It has a double tube structure including a bellows tube 3 arranged concentrically.

Reference numeral 15 indicates a support bracket attached to the body of the diesel engine 10. The support bracket 15 has a box-shaped high-pressure inner pipe support 20 and the receiving metal fitting 4 is a mounting bolt. It is attached at 4a.

The receiving metal fitting 4 has two leg portions 4c and has a space between the two leg portions so that the tightening metal fitting 5 can be slidably inserted therein. Is inserted.

It is to be noted that only the high pressure inner pipe 2 of the double pipe fuel pipe 1 is sandwiched between the receiving metal fitting 4 and the tightening metal fitting 5, and the bellows pipe 3 as the outer pipe is supported by the support member 20. Then, as shown in FIG. 2, the upper and lower end portions 3a and 3b of the peeled portion are attached to the upper and lower surfaces of the receiving metal fitting 4 by bolts 3c, respectively.

Then, V-shaped grooves 4b and 5b are respectively formed substantially in the centers of the surface portions of the receiving metal fitting 4 and the tightening metal fitting 5 facing each other, and the high pressure inner pipe 2 is directly connected between the V-shaped grooves 4b and 5b. It is configured so that it can be clamped.

Further, the tightening fitting 5 is adapted to be attached to the receiving fitting 4 by a tightening bolt 5 a, and the receiving fitting 4 and the tightening fitting 5 constitute a box-shaped high-pressure inner pipe support structure 20.

Reference numeral 6 indicates a cover for closing the opening of the receiving fitting 4, and the cover 6 is attached to both ends of the receiving fitting 4 by bolts 6 a.

In the above-mentioned configuration, the high pressure inner pipe 2 is sandwiched between the V-shaped groove 4b of the metal fitting 4 and the V-shaped groove 5b of the tightening metal 5, and the tightening bolt 5 is tightened to fix the high pressure inner pipe 2. The support bracket 15 can be directly supported.

Next, the bellows pipe 3 is attached to the upper and lower end portions 3a and 3b of the receiving bracket 4 with bolts 3c, and the covers 6 are attached to the ends of both legs of the receiving bracket 4 with bolts 6a. Work to support 1 is completed.

In this way, the high-pressure inner pipe 2 can be directly supported, and the vibration stress of the high-pressure inner pipe 2 can be significantly reduced.

Further, since the high-pressure inner pipe 2 is sandwiched between the inclined surfaces of the V-shaped grooves 4b and 5b, it is possible to perform the retightening with the tightening bolt 5a at regular intervals. If you mark the head of the tightening bolt, you can check the additional tightening.

Further, since the outer tube is composed of the bellows tube 3, the work of cutting and peeling at the support can be easily performed, while the bellows tube can be easily rolled up at this cutting portion and in the open state. The maintenance of can be performed.

[0025]

[Effect of the device]

 As described above in detail, the double-tube fuel pipe support structure for a diesel engine of the present invention provides the following effects and advantages. (1) It becomes possible to directly support the high-pressure inner pipe of the double pipe structure, and as a result, the vibration stress of the fuel pipe can be significantly reduced. (2) Re-tightening can be easily performed by tightening the tightening bolts.

[Brief description of drawings]

FIG. 1 is a plan cross-sectional view of a double-tube fuel tube support structure for a diesel engine as an embodiment of the present invention.

FIG. 2 is a sectional view of the same side.

FIG. 3 is a cutaway front view of the same portion.

FIG. 4 is a partial cross-sectional side view showing the disposition of the fuel pipe together with a diesel engine.

FIG. 5 is a side view showing a conventional arrangement of fuel tubes together with a diesel engine.

FIG. 6 is a plan sectional view of the high-pressure fuel pipe support structure.

[Explanation of symbols]

 1 Fuel pipe 2 High pressure inner pipe 3 Bellows pipe 4 Receiving metal fittings 4b, 5b V-shaped groove 5 Tightening metal fitting 5a Tightening bolt 6 Cover 10 Diesel engine 11 Fuel injection pump 12 Fuel injection valve

Claims (1)

[Scope of utility model registration request] 1. A fuel pipe support structure for a diesel engine of a double-pipe type, comprising a thick high-pressure inner pipe and an outer pipe arranged outside the high-pressure inner pipe, wherein the outer pipe is a bellows pipe. On the other hand, a peeling portion is formed on the bellows pipe, and the bellows pipe is provided with a high pressure inner pipe support body capable of directly supporting the high pressure inner pipe through the peeling portion. The support is attached to a support bracket mounted on the diesel engine and has a V-shaped groove for receiving the high-pressure inner pipe, and the V-shaped groove is fastened to the receiving metal with a tightening bolt. A double-tube fuel pipe support structure for a diesel engine, which is configured with a tightening metal member having a V-shaped groove capable of sandwiching the high-pressure inner pipe in cooperation with.