JPH08144886A - Fuel supply mechanism of diesel engine - Google Patents

Abstract

PURPOSE: To facilitate the removable attachment of a pipe joint or the like and prevent a high pressure pipe from damages by attaching the tip of a pipe- like member inserted in a hole in the side of a cylinder head threadingly to a nozzle holder and fixing the tip tegether with a high pressure joint attached to an injection pump through a gap by a bolt. CONSTITUTION: A pipe-like member 2 having a flange-like member 3 previously inserted therein from the inside is inserted in a lateral hole provided in a cylinder head 1 and the male thread part of the tip of the member 3 is fixedly screwed in a nozzle holder 4. Next, A fuel high pressure pipe 5 is inserted in the pipe-like member 2. The fuel high pressure pipe 5 is formed on the inside and outside ends with arcuate lug parts. By fastening the high pressure pipe joint 7 and flange-shaped member 3 to each other with a fastening bolt 28, a recess part 4a of the nozzle holder 4 and a recess 7a of the high pressure pipe joint 7 are fitted on the lugs of the fuel high pressure pipe 5 to seal the inner and outer ends of the fuel high pressure pipe 5. Also, the fuel high pressure pipe 5 is enclosed from the outside by a rubber packing 29, so that the assembling error can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply mechanism for diesel engines.

[0002]

2. Description of the Related Art Conventionally, a technique relating to a fuel supply mechanism of a diesel engine has been known. For example,
Japanese Utility Model Publication No. 4-21003 and Japanese Utility Model Publication No. 5-57354.
Gazette, Japanese Utility Model Laid-Open No. 61-178043, Japanese Utility Model Laid-Open No. 61-164404, Japanese Utility Model Laid-Open No. 63-19069.
It is like the technique described in Japanese Laid-Open Patent Publication No. 61-204606.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the technique described in Japanese Utility Model Publication No. 4-21003,
The fuel high-pressure pipe is loosely fitted by the nozzle holder and the high-pressure pipe joint, and each end face is fixed by fixing the high-pressure pipe joint to the cylinder head.However, in this configuration, the nozzle holder itself also receives the tightening force and the nozzle There were drawbacks such as the holder falling over and the seal being incomplete. Further, in the technique described in Japanese Utility Model Laid-Open No. 5-57354, the fuel high-pressure pipe is directly screwed to the nozzle holder, and the fuel high-pressure pipe is attached to this screwed portion and the high-pressure pipe joint and the fuel injection pump. There is a problem in that it is attached at two places of the portion, and bending stress is generated in the threaded portion of the fuel high-pressure pipe due to vibration or the like, which causes cracks. The invention of claim 1 solves this problem.

Further, in the structure of the fuel supply mechanism of the conventional diesel engine, the fuel oil is supplied from the main fuel oil pipe through the branch pipe, and the occurrence of cracks in the welded portion of the branch pipe poses a problem. Further, since the fuel oil main pipe is fixed, there are problems such as poor workability and the need for support for the fuel oil main pipe. As another configuration, the branch pipe is abolished, and the fuel oil main pipe between the fuel injection pump and the fuel injection pump is formed by connecting a bellows type pipe with a flange.
When removing the fuel injection pump, it was necessary to remove the main fuel oil pipes on both sides. The invention of claim 2 solves this problem.

Further, in the fuel supply mechanism of the conventional diesel engine, for the lubrication of the pinion portion which drives the fuel injection pump, a pipe dedicated to the pinion lubrication is provided, and further a dedicated pressure regulating valve and a filter are provided. Therefore, a large number of pipes are present, and there is a possibility that the pipes may crack due to vibration, and it is necessary to secure a mounting space. The invention of claim 3 solves this problem.

[0006]

The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be described. In the first aspect of the present invention, in the mounting structure of the fuel high-pressure pipe 5 that connects the fuel injection pump P and the nozzle holder 4, it is inserted into a hole from the side surface of the cylinder head 1 to the nozzle holder 4, and the tip is screwed to the nozzle holder 4. The pipe-shaped member 2 and the high-pressure pipe fitting attached to the injection pump are inserted into the pipe-shaped member 2 by opening a gap and fixing with a bolt, and the recess of the nozzle holder 4 and the recess of the high-pressure pipe joint 7 are inserted. The fuel high-pressure pipe 5 loosely fitted by is sandwiched, and the internal passage is provided with the fuel high-pressure pipe 5 communicating with the nozzle holder 4 from the fuel injection pump P through the high-pressure pipe joint 7.

In the second aspect of the present invention, in the fuel oil inlet / outlet pipe of the fuel injection pump P, the fuel injection pump P and the fuel oil main pipe are attached by the fuel oil pipe joint, and the pipe joint connecting the two fuel oil main pipes is slid. The fuel injection pump P can be extracted for each cylinder.

According to the third aspect of the present invention, in the oil injection piping mechanism for the pinion of the fuel injection pump P, the pinion oil passage is used as the oil passage hole for lubricating oil in each cylinder block and cylinder head.

[0009]

Next, the operation will be described. According to claim 1, the fuel high-pressure pipe 5, the pipe-shaped member 2, the high-pressure pipe joint 7 and the like can be easily attached and detached, and the fuel high-pressure pipe 5 is free from cracks and vibration damages. It was possible to eliminate the assembly error that occurs when assembling the pipe 5 and the high-pressure pipe joint 7. Further, since the fuel high pressure pipe 5 is loosely fitted between the nozzle holder 4 and the high pressure pipe joint 7, no bending force is generated,
Since no external force is generated on the nozzle holder 4, the cylinder head H is not displaced or tilted.

According to the second aspect of the present invention, in the fuel oil inlet / outlet pipe of the fuel injection pump P, the fuel injection pump P and the fuel oil main pipe are attached by a fuel oil pipe joint, and the joint 13 is slid to inject fuel into each cylinder. Since the pump P can be pulled out, when the fuel injection pump for each cylinder is taken out, the joint 13 can be slid to be housed in the main fuel pipe 6b without interfering with the fuel injection pumps of other cylinders. , It became possible to easily pull out each fuel injection pump.

According to the third aspect of the present invention, in the oil injection piping mechanism for the pinion of the fuel injection pump P, the pinion oil passage is used as the oil passage hole for the lubricating oil in each cylinder block and cylinder head. By using the oil passage piping for pinion lubrication from the oil passage for lubrication, it is possible to eliminate the piping around the pressure regulating valve, the filter, etc., and it is possible to reduce the elements that cause cracks due to vibration. .

[0012]

EXAMPLES Next, examples will be described. FIG. 1 is a sectional view showing a fuel oil supply mechanism from a fuel injection pump P provided in a cylinder head 1 to a nozzle holder 4, and FIG. 2 shows a portion of a high pressure pipe joint 7 from the fuel injection pump P to the pipe-shaped member 2 as well. The front view shown in FIG. 3, FIG. 3 is a sectional view showing another embodiment of the pipe-shaped member 2 and the flange-shaped member 3, and FIG. 4 is a sectional view showing the configuration of still another pipe-shaped member 2 and the flange-shaped member 3. 5 is a sectional view showing a portion of the high-pressure pipe joint 7 of FIG. 4, FIG. 6 is a sectional view of a portion of the fuel oil main pipes 6 and 11 in the fuel injection pump P, FIG. 7 is a side view of the fuel injection pump P, and FIG. Is a front view showing a pinion lubrication mechanism of a fuel injection pump P.

FIG. 9 is a side sectional view showing the fuel injection pump chamber cover 15, the fuel injection pump P, the pump base 17, and the lower support 23. FIG. 10 is a front view showing the side cover 30 and the lower support 23. Fig. 11 and Fig. 11 are the same as Fig. 1.
0 is a side view, FIG. 12 is a cross-sectional view showing an idle gear support oiling mechanism in a gear case portion of a diesel engine, FIG. 13 is an enlarged view of the idle gear support portion, and FIG. 14 is a lubricating oil passage to the idle gear support portion. FIG. 15 is a side sectional view showing a structure in which the hole center of the adjusting screw for adjusting and setting the injection valve opening pressure and the center of the main body of the nozzle holder are tilted, and FIG. 16 shows the nozzle holder 4 of FIG. FIG. 17 is a plan sectional view of a portion of a conventional nozzle holder.

A fuel oil supply mechanism from the fuel injection pump P to the fuel injection nozzle N will be described with reference to FIGS. 1 and 2.
The fuel injection nozzle N is fitted in an insertion hole formed in the cylinder head 1, and is fixed to the cylinder head 1 by the nozzle holder 4. The pressure oil discharged from the fuel injection pump P is supplied to the concave portion 4a provided on the side surface of the nozzle holder 4 via the high-pressure fuel pipe 5. Then, since oil leakage occurs from the fuel high-pressure pipe 5, the pipe-shaped member 2 is fitted on the outer periphery of the fuel high-pressure pipe 5 in order to recover the oil leakage. A passage 2a is formed between the fuel high-pressure pipe 5 and the pipe-shaped member 2, and the passage 2a serves as a return passage for oil leakage.

High-pressure fuel pipe 5 for the nozzle holder 4
The attachment of the pipe-shaped member 2 will be described. Since the pipe-shaped member 2 in which the flange-shaped member 3 is previously fitted from the inside is inserted into the lateral hole formed in the cylinder head 1, and the male-threaded portion is formed at the tip of the pipe-shaped member 2, The male screwing portion is screwed and fixed to the female screwing portion formed on the nozzle holder 4. A rubber packing 26 seals a portion where the side surface of the cylinder head 1 contacts the pipe-shaped member 2. Next, the fuel high pressure pipe 5 is inserted into the pipe member 2. The fuel high-pressure pipe 5 has arcuate convex portions at its inner end and outer end. Next, by tightening the high pressure pipe joint 7 and the flange-shaped member 3 with the fastening bolts 28,
The recess 4a of the nozzle holder 4 and the recess 7 of the high pressure pipe joint 7
a fits with the convex portion of the fuel high-pressure pipe 5 and seals the inner and outer ends of the fuel high-pressure pipe 5. Further, the high pressure fuel pipe 5 is sealed from the outside by the rubber packing 29.

Thus, the high-pressure fuel oil from the fuel injection pump P is supplied from the fuel oil passage 7d of the high-pressure pipe joint 7 through the oil passage inside the high-pressure fuel pipe 5 to the fuel injection nozzle N from the nozzle holder 4. To be done. Then, as shown in FIG. 2, from the fuel injection pump P-side seal body 10a formed in the lid portion of the fuel injection pump body 10 of the fuel injection pump P,
The fuel oil passage 7d of the high-pressure pipe joint 7 is inherited, the fuel oil passage 7d communicates with the fuel high-pressure pipe 5, and pressure oil is supplied.

The leaked oil generated at the seal body 10a passes through the oil passage 7c of the high pressure pipe joint 7 to the passage 2
can be sent to a. Then, it is sent to the oil passage 1 a formed between the outer periphery of the pipe-shaped member 2 and the hole of the cylinder head 1 by the pores 2 b opened in the pipe-shaped member 2.
The oil leakage between the nozzle holder 4 and the high pressure fuel pipe 5 seals
The rubber packing 29 is passed from the fuel injection pump P side through the passage 2a or the passage 1a and the seal body 10a and the oil passage 7c.
Enters the oil passage inside, passes through the passage 2a between the fuel high-pressure pipe 5 and the pipe-shaped member 2 through the fine hole 2b, reaches the oil passage 1a, is merged, and is guided to the outside. The high pressure pipe joint 7 and the fuel injection pump main body 10 are fastened with bolts, and the seal body 10a is sandwiched between the high pressure pipe joint 7 and the fuel injection pump main body 10 so that an oil leakage gap does not occur. I have to.

Next, the fastening portion of the fuel high-pressure pipe 5, the pipe-shaped member 2 and the high-pressure pipe joint 7 in the embodiment shown in FIG. 3 will be described. In this embodiment, the portion different from the embodiment of FIGS. 1 and 2 is the fastening portion between the high-pressure pipe joint 7 and the flange-shaped member 3. In this embodiment, the flange-shaped member 3 can be screwed on the outer end portion of the pipe-shaped member 2, and in the screwed state, the lock nut 50 is further screwed on the outer side to loosen the flange-shaped member 3. To prevent. The flange-shaped member 3 and the high-pressure pipe joint 7 are fastened and fixed by fastening bolts 28 which are bolts with nuts. Other configurations are the same.

Next, an embodiment shown in FIGS. 4 and 5 will be described. The difference in this embodiment is the fixed portion between the high-pressure pipe joint 7 and the cylinder head 1. In this configuration, the flange-shaped member 3 is not provided, and the high-pressure pipe joint 7 is directly fastened to the cylinder head 1 by the fastening bolt 28, and when the fastening bolt 28 is tightened, the fuel high-pressure pipe pressing pipe 51 becomes The stepped portion at the tip of the high-pressure fuel tube 5 is pressed so that the convex portion at the tip of the high-pressure fuel tube 5 is pressed into the concave portion 4a of the nozzle holder 4. Therefore, unlike the configuration in which the tip of the pipe-shaped member 2 is screwed onto the nozzle holder 4 as in the above-described embodiment, the high pressure pipe joint 7 is tightened by the fastening bolt 28, so that the fuel high pressure pipe pressing pipe 51 The stepped portion at the tip of the high-pressure pipe 5 is configured to be pushed and pressed. An O-ring 55 is interposed between the tip of the fuel high pressure pipe pressing pipe 51 and the nozzle holder 4. Similarly, an O ring 85 is also interposed between the fuel high pressure pipe pressing pipe 51 and the cylinder head 1.

Further, a seal body 57 is loosely fitted to the outer end of the fuel high pressure pipe pressing pipe 51, and the seal body 57 and the fuel high pressure pipe pressing pipe 51 are fitted so as to prevent leakage of oil leakage. I am configuring. The high pressure pipe joint 7 and the seal body 5
7 and 7 are fastened by fastening bolts 52. An O-ring 53 is provided in the middle of the fuel high pressure pipe pressing pipe 51.
Is externally fitted, and in the O-ring 53, the fuel high-pressure pipe 5 which is a return of the fuel oil from the fuel injection pump main body 10 to the seal body 10a and the high-pressure pipe joint 7 and the fuel oil from the fuel injection nozzle N. The fuel oil is separated between the pipe-shaped member 2 and the pipe-shaped member 2, and is guided to the outside of the cylinder head 1 via oil passages 58 and 59 formed in the cylinder head 1. 54 is an oil leak passage provided in the fuel high pressure pipe pressing pipe 51.

Next, referring to FIGS. 6 and 7, when the fuel injection pump P attached to the cylinder head 1 is removed,
A fuel oil main pipe that supplies fuel oil between the left and right fuel injection pumps P is installed between adjacent fuel injection pumps P. Therefore, it was difficult to attach and detach the fuel injection pump P for each cylinder. In the present invention, the fuel injection pump P
In, the fuel oil pipe joint is fastened to the fuel injection pump body 10 with bolts, and the fuel oil main pipes 6 and 11 having different lengths are
Each is attached by the cap nut 8. Fuel oil main pipes 6.11 having different lengths are similarly attached to the fuel injection pumps P on both sides, and two fuel oil main pipes 6.1 are connected by a pipe joint 13.
Connect 1 together.

At this time, an O-ring 14 is provided to prevent fuel oil from leaking. Further, in order to prevent the axial displacement of the pipe joint 13, a C-shaped retaining ring 27 is provided. Fuel injection pump P
When taking out, the C-shaped retaining ring is removed, and the pipe joint 13 is slid to completely overlap the longer fuel oil main pipe 6. With such a configuration, the fuel oil main pipe 6.1
The fuel injection pump P can be pulled out integrally with 1 and the pipe joint body 12. Fuel oil is supplied from the pipe joint body 12 to the inside of the fuel injection pump body 10, and the seal body 10
It is supplied to the nozzle holder 4 from a through the high pressure pipe joint 7.

Next, referring to FIG. 8, the invention of claim 3 will be described. Another oil passage hole is bored in the middle of an oil passage hole for valve arm lubrication that penetrates from the main gallery of the cylinder block B to the cylinder head 1, and a fuel injection pump is formed from the oil passage hole by a lubricating oil pipe 49. Lubricate the P pinion.
The pressure and flow rate are adjusted by a pressure regulating flow rate adjusting valve 47 provided at the outlet of the oil passage hole, a flow rate inspection window 48 and a small filter 50 are provided at the joint portion before the pinion, and the fuel injection pump P
Lubricate the pinion.

Next, referring to FIGS. 9, 10, and 11, the oil leakage recovery mechanism will be described. In the lower support 23 of the fuel injection pump chamber cover 15, a plurality of passages are provided inside the fuel injection pump chamber cover 15, and one of the passages is attached to the cylinder block B.
Since it intersects with the bolt hole 9 and the pipe joint bolt 19 itself is also a pipe joint, the oil leakage can be recovered from the lubricating oil hole of the cylinder block B without providing a branch pipe. There is.

Leakage oil at the seal portion of the high-pressure pipe and oil leak at the time of breakage pass through an oil passage hole opened in the cylinder head of each cylinder,
Next, the oil passes through the pipe 20 and is collected in the oil passage 23b formed inside the lower support 23 of the fuel injection pump chamber cover 15. Further, the oil leakage from the fuel injection pump P of each cylinder to the pump base 17 is collected in the oil receiver 17a of the pump base 17, and the oil hole 17b opened in the pump base 17 causes
Pass through the oil hole 18a opened in the cylinder block B,
The oil is collected in the oil hole 23 a formed inside the lower support 23 via the pipe joint bolt 19. The collected oil leakage is fixed by the lower support 23 and the pipe joint bolt 19 to seal the passage. It is guided to the high-pressure pipe oil leakage pipe 21 through the side cover 30. Also pump base 1
The oil leakage of No. 7 is guided to the pipe 22.

The lubricating mechanism of the idle gear support portion will be described with reference to FIGS. 12, 13 and 14. On the side surface of the diesel engine, a speed governor G is fixedly installed on a portion where the crankshaft C projects, and the speed governor G is driven by a gear 80 provided on the outer periphery of the crankshaft C via an idle gear 36. There is. The idle gear 36 has a camshaft 6
7 is a gear that extracts power for driving the speed governor G, the lubricating oil pump, the cooling water pump, and the like. The gear 80 meshes with the idle gear 36, and the gear 35 integrated with the gear 36 meshes with the other gear 32. The gear 32 is fixed to a cam shaft 67, and the cam shaft 67 opens and closes an air supply / exhaust valve. Further, the fuel injection pump and the speed governor G are also driven by the cam shaft 67. That is, the bevel gear 31 is fixed to the side surface of the gear 32, and the bevel gear 3 is fixed.
1 meshes with the bevel gear 33 of the speed governor G to drive the speed governor G.

In the general structure as described above, in this structure, a cylinder block having a gear case and a gear case lid as an integrated structure drives an idle gear for driving a cam shaft, a lubricating oil pump, a cooling water pump and the like. The shaft ordering oil structure of 36 idle gear supports 55 is simply configured. That is, in the cylinder block in which the gear case and the gear case lid are integrally structured, the gear case portion has a shape of a blind alley, and it becomes impossible to process the mounting surface of the idle gear support 55 inside the gear case. Therefore, in this configuration, the idle gear support 55 has a stepped shape, and a hole penetrating the inside and the outside of the gear case is provided, and the idle gear support 55 is inserted from the outside and supported by the inner and outer walls of the cylinder block. It has a structure.

Conventionally, in the case of such a structure, the bearing portion of the idle gear support 55 was lubricated by piping, but in this structure, an oil groove is formed in the support portion inside the idle gear support 55. An oil passage for supplying lubricating oil from the lubricating oil main gallery to the crankshaft main bearing is guided to the outer periphery of the support portion of the idle gear support 55 to lubricate the idle gear support 55. .

That is, a circumferential groove 57 is provided on the outer circumference of the idle gear support retainer 56 which supports the inside of the idle gear support 55. The idle gear support retainer 56 is provided with a lubrication passage 58 for a lubricating oil passage for the bearing of the crankshaft C.
Since they are communicated with each other, the lubricating oil passes from the main gallery 60 through the lubrication passage 58 and enters the circumferential groove 57, and then from the lubrication passage 59 to the main bearing of the crankshaft C. Then, both the idle gear support retainer 56 and the crankshaft C can be lubricated.

In order to lubricate the idle gear support 55, an oil passage 62 communicating from the circumferential groove 57 to the gap 61 between the idle gear support retainer 56 and the idle gear support 55 is bored in the idle gear support retainer 56. As a result, the circumferential groove 57 reaches the gap 61. Next, the holding bolt 64 is attached to the idle gear support retainer 56.
The oil passage 63 is screwed between the idle gear support 55 and the idle gear support 55, and the oil passage 63 is bored in the holding bolt 64.
Up to 5. The central oil passage 65 is the idle gear support 55.
Since it communicates between the outer periphery of the bearing bush 66 and
Lubrication between the idle gear support 55 and the bearing bush 66 is performed.

With this structure, the lubrication circuit from the main gallery 60 to the crankshaft C is communicated with the circumferential groove 57, so that the idle gear support 55 and the bearing bush 66 can be lubricated. It will be. Further, the pipeless structure can be used for the lubrication of the idle gear support 55, and the damage of the piping can be prevented. Further, the position of the idle gear 36 can be determined without worrying about interference between the through hole of the inner supporting portion of the idle gear support 55 and the lubricating oil passage of the bearing of the crankshaft C.

15, 16 and 17, in the fuel injection valve, the hole center position of the adjusting screw 68 provided in the nozzle holder 4 for adjusting and setting the injection valve opening pressure is set from the center of the nozzle holder 4. The tilted configuration will be described.

Conventionally, the structure is as shown in the sectional view of FIG. That is, in the prior art, the injection valve opening pressure adjusting screw 6
Since 8 is inserted into the hole formed straightly along the axis of the nozzle holder 4, the depth of screwing of the inner end screw portion 2d of the pipe-shaped member 2 on the outer periphery of the fuel high-pressure pipe 5 is increased. In order to do so, it is necessary to increase the diameter of the main body of the nozzle holder 4 or to configure the nozzle holder 4 into two eccentric cylinders. In any case, such a conventional structure has a great influence on the dimensions of functional parts near the fuel injection valve, for example, related parts of the intake and exhaust valves. In this configuration, since the hole of the injection valve opening pressure adjusting screw 68 is located at a position farther from the center of the nozzle holder 4 in the threaded portion of the inner end screw portion 2d of the pipe-shaped member 2, the nozzle holder 4 The diameter of the main body can be reduced, and the screwing depth of the inner end screw portion 2d of the pipe-shaped member 2 can be increased.

That is, this structure will be described with reference to FIGS. Conventionally, the injection valve opening pressure adjusting screw 68 is usually formed straight along the axis of the nozzle holder 4. As shown in FIG. 17, the center of the injection valve opening pressure adjusting screw 68 is bored straight along the center of the nozzle holder and the axial center line. In this case, the nozzle holder body has a larger diameter than the present invention. is there. In addition, FIG. 17-2 is configured as another cylinder in which only the portion where the inner end screw portion 2d of the pipe-shaped member 2 is screwed is eccentric.

On the other hand, in the present invention, the injection valve opening pressure adjusting screw 68 is formed into an oblique hole so as to be inserted obliquely, and the center of the nozzle holder 4 is formed at the portion intersecting the inner end screw portion 2d. It was constructed so that it would pass through a position deviated from it. Thereby, the inner end screw portion 2d of the pipe-shaped member 2
Give the part to be screwed with a functional dimension sufficient for screwing,
And a compact injection valve mechanism can be provided.
Further, by making the injection valve pressure adjusting screw 68 slantably insertable, a sufficient size can be given for the related parts of the intake valve and the exhaust valve. Further, if the nozzle holder 4 is of the eccentric cylinder type, the workability is poor and the productivity is poor, which leads to an increase in cost, but this problem can also be eliminated.

[0036]

Since the present invention is constructed as described above, it has the following effects. The high-pressure fuel pipe 5 connecting the fuel injection pump P and the nozzle holder 4 as in claim 1.
In the mounting structure, the pipe-shaped member 2 inserted into the hole from the side surface of the cylinder head 1 to the nozzle holder 4 and screwed to the nozzle holder 4 and the high-pressure pipe joint 7 mounted on the injection pump are opened. The fuel high-pressure pipe 5 inserted into the pipe-shaped member 2 and loosely fitted by the recess of the nozzle holder 4 and the recess of the high-pressure pipe joint 7 is sandwiched by the bolts and the internal passage is separated from the fuel injection pump P. Since the fuel high pressure pipe 5 communicating with the nozzle holder 4 via the high pressure pipe joint 7 is provided, the fuel high pressure pipe 5 and the pipe-shaped member 2 are provided.
And the high-pressure pipe joint 7 can be easily attached and detached, and the fuel high-pressure pipe 5 is free from cracks and vibration damage, and the pipe-shaped member 2
It was possible to eliminate an assembly error that occurs when assembling the fuel high pressure pipe 5 and the high pressure pipe joint 7. In addition, fuel high pressure pipe 5
Since the valve is loosely fitted between the nozzle holder 4 and the high-pressure pipe joint 7, no bending force is generated, and no external force is generated on the nozzle holder 4, so that the cylinder head H is not displaced or tilted.

In the fuel oil inlet / outlet pipe of the fuel injection pump P, the fuel injection pump P and the fuel oil main pipe are attached by a fuel oil pipe joint, and the fuel oil main pipe is slid to inject fuel into each cylinder. Since the pump P can be pulled out, when taking out the fuel injection pump for each cylinder, the pipe joint that connects the two long and short fuel main pipes can be slid and accommodated, so that the fuel injection pump for other cylinders can be stored. The fuel injection pumps can now be easily withdrawn without interfering with each other.

According to the third aspect of the present invention, in the oil supply pipe mechanism for supplying oil to the pinion of the fuel injection pump P, the pinion oil supply passage is
Since the oil passage holes for lubricating oil in each cylinder block and cylinder head are also used, from the oil passage for lubricating oil of each cylinder,
By providing the oil passage piping for pinion lubrication, it is possible to eliminate the piping around the pressure regulating valve, the filter, etc., and it is possible to reduce the elements that cause cracks due to vibration.

[Brief description of drawings]

FIG. 1 is a sectional view showing a fuel oil supply mechanism from a fuel injection pump P provided in a cylinder head 1 to a nozzle holder 4.

FIG. 2 is a front view showing a portion of a high pressure pipe joint 7 from a fuel injection pump P to a pipe member 2 in the same manner.

FIG. 3 is a cross-sectional view showing another embodiment of the pipe-shaped member 2 and the flange-shaped member 3.

[FIG. 4] Still another pipe-shaped member 2 and flange-shaped member 3
FIG.

5 is a cross-sectional view showing a portion of the high pressure pipe joint 7 of FIG.

FIG. 6 is a fuel oil main pipe 6/11 in the fuel injection pump P.
Sectional view of the portion of FIG.

FIG. 7 is a side view of a fuel injection pump P.

FIG. 8 is a front view showing a pinion lubrication mechanism of a fuel injection pump P.

FIG. 9 is a side sectional view showing a portion of a fuel injection pump chamber cover 15, a fuel injection pump P, a pump base 17, and a lower support 23.

FIG. 10 is a front view showing a side cover 30 and a lower support 23.

11 is a side view of FIG.

FIG. 12 is a sectional view showing an oiling mechanism of an idle gear support in a gear case portion of a diesel engine.

FIG. 13 is an enlarged view of the idle gear support portion.

FIG. 14 is a drawing showing a lubricating oil passage to an idle gear support portion.

FIG. 15 is a side sectional view showing a configuration in which the center of the hole of an adjusting screw for adjusting and setting the injection valve opening thickness and the center of the main body of the nozzle holder are inclined.

16 is a plan sectional view of a portion of the nozzle holder 4 of FIG.

FIG. 17 is a plan sectional view of a portion of a conventional nozzle holder.

[Explanation of symbols]

 1 Cylinder Head 2 Pipe-shaped Member 4 Nozzle Holder 5 Fuel High Pressure Pipe 7 High Pressure Pipe Joint P Fuel Injection Pump

Claims (3)

[Claims] 1. In a mounting structure of a fuel high-pressure pipe 5 connecting a fuel injection pump P and a nozzle holder 4, it is inserted into a hole extending from a side surface of a cylinder head 1 to a nozzle holder 4, and a tip is screwed to the nozzle holder 4. The pipe-shaped member 2 and the high-pressure pipe joint 7 attached to the injection pump are inserted into the pipe-shaped member 2 by opening a gap and fixing them with a bolt, and the recess of the nozzle holder 4 and the recess of the high-pressure pipe joint 7 are inserted. Of the diesel engine, in which the fuel high-pressure pipe 5 loosely fitted by is inserted, and the internal passage is provided with the fuel high-pressure pipe 5 communicating with the nozzle holder 4 from the fuel injection pump P via the high-pressure pipe joint 7. Fuel supply mechanism. 2. In the fuel oil inlet / outlet pipe of the fuel injection pump P, the fuel injection pump P and the fuel oil main pipe are attached by a fuel oil pipe joint, and a pipe joint connecting the two fuel oil main pipes is slid so that each cylinder A fuel supply mechanism for a diesel engine, characterized in that the fuel injection pump P can be withdrawn. 3. A fuel for a diesel engine, characterized in that, in a lubrication piping mechanism for lubricating a pinion of a fuel injection pump P, the pinion lubrication passage is also used as an oil passage hole for lubricating oil in each cylinder block and cylinder head. Supply mechanism.