JP3955071B2 - Piping structure for oil leakage recovery of diesel engine - Google Patents

Description

  The present invention relates to a piping structure for recovering oil leakage from a fuel injection valve in a diesel engine.

A piping structure for oil leakage recovery from a fuel injection valve in a conventional diesel engine will be described with reference to FIG. A fuel injection valve 6 is fitted in the cylinder head 1 of the diesel engine, and a nozzle portion is desired in the combustion chamber of the cylinder block 2 and the cylinder liner 3 fitted in the cylinder head 1. In the cylinder head 1, fuel leakage occurs in the fuel injection valve housing portion 1 a in which the fuel injection valve 6 is fitted. Therefore, in order to recover the oil leakage, an oil passage for oil leakage recovery is collected in the cylinder head 1. 1b is formed, and an outlet terminal 14 is provided on the side surface of the cylinder head 1 (in this embodiment, the front surface, that is, the control side surface), and a leaked oil recovery pipe 15 is connected to the outlet to recover the leaked oil. It is said.
Japanese Patent No. 2618265

  First, in the conventional oil leakage recovery structure from the fuel injection valve, the oil leakage recovery pipe 15 is connected to the cylinder head 1. Therefore, when the cylinder head 1 is removed from the cylinder block 2 for maintenance work, the oil leakage recovery must be performed. The working tube 15 must be removed. In the case of the multi-cylinder type, removing the oil leakage collecting pipe 15 connected to each cylinder head 1 is a complicated operation. In addition, a bending action tends to be applied to the oil leakage recovery pipe 15 during the removal work, and if the removal work occurs frequently, the oil leakage recovery pipe 15 may be cracked.

The present invention uses the following means in order to solve the above problems.
In order to collect the oil leakage from the fuel injection valve 6 fitted in the cylinder head 1 of the diesel engine, the oil passage 1b for oil recovery is drilled horizontally from the fuel injection housing 1a provided in the cylinder head 1. Furthermore, an oil leakage recovery oil passage 1c is drilled vertically downward from the oil leakage recovery oil passage 1b, an outlet is opened on the lower surface of the cylinder head 1, and the cylinder block 2 disposed below the cylinder head 1 is opened. In addition, in order to communicate with the oil leakage recovery oil passage 1c, a vertical oil leakage recovery oil passage 2a is drilled, an opening in the upper surface of the cylinder block 2 of the oil leakage recovery oil passage 2a, An outlet terminal communicating with the oil leakage recovery oil passage 2a is provided on the outer surface of the cylinder block 2 so as to communicate with the opening of the oil leakage recovery oil passage 1c on the lower surface of the cylinder head 1, and the outlet terminal is provided with the outlet terminal. Connecting the leaked oil recovery pipe 15 A.

Since the present invention is configured as described above, the following effects can be obtained.
In order to collect the oil leakage from the fuel injection valve 6 fitted in the cylinder head 1 of the diesel engine, the oil passage 1b for oil recovery is drilled horizontally from the fuel injection housing 1a provided in the cylinder head 1. Furthermore, an oil leakage recovery oil passage 1c is drilled vertically downward from the oil leakage recovery oil passage 1b, an outlet is opened on the lower surface of the cylinder head 1, and the cylinder block 2 disposed below the cylinder head 1 is opened. In addition, in order to communicate with the oil leakage recovery oil passage 1c, a vertical oil leakage recovery oil passage 2a is drilled, an opening in the upper surface of the cylinder block 2 of the oil leakage recovery oil passage 2a, An outlet terminal communicating with the oil leakage recovery oil passage 2a is provided on the outer surface of the cylinder block 2 so as to communicate with the opening of the oil leakage recovery oil passage 1c on the lower surface of the cylinder head 1, and the outlet terminal is provided with the outlet terminal. Because the oil leakage recovery pipe 15 is connected Fuel leakage from the fuel injection valve flows into the oil passage in the cylinder block, and the oil leakage recovery pipe is connected to the oil leakage recovery passage in the cylinder block. When removing the head from the cylinder block, there is no need to remove the oil leakage collection pipe from the cylinder head as in the conventional case, which makes the cylinder head maintenance work more efficient and allows frequent removal of the oil leakage collection pipe. A problem such as a crack caused by a bending action is avoided.

Embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a partial side cross-sectional view of a diesel engine showing an oil passage for recovering oil leakage from a fuel injection valve of the present invention, and FIG. 2 is a partial side cross-sectional view of a diesel engine showing a starting air supply piping structure of the present configuration, 3 is a partial front view, FIG. 4 is a partial side sectional view of a diesel engine showing an oil passage and piping for recovering oil leakage from a conventional fuel injection valve, and FIG. 5 shows a conventional starting air supply piping structure. It is a partial side view of a diesel engine.

First, the structure of the oil path for oil leakage recovery from the fuel injection valve will be described with reference to FIG.
Combustion in a cylinder liner 3 in which a fuel injection valve 6 is fitted in a fuel injection valve housing portion 1 a formed in the cylinder head 1 and a lower end nozzle portion is fitted in the cylinder head 1 and the cylinder block 2. It faces the room. Further, a fuel injection pipe 5 is fitted into the cylinder head 1 from a discharge valve of a fuel injection pump 4 (see FIG. 2 or FIG. 3) outside the cylinder head 1 and connected to the fuel injection valve 6. The fuel discharged from the fuel is supplied to the fuel injection valve 6.

  In the cylinder head 1, an oil leakage recovery oil passage 1 b is drilled horizontally from the fuel injection valve housing portion 1 a, and the oil leakage recovery oil passage is vertically below the oil leakage recovery oil passage 1 b. 1c is drilled to open an outlet on the lower surface of the cylinder head 1. Also, a vertical oil leakage recovery oil passage 2a is formed in the cylinder block 2 so as to communicate with the oil leakage recovery oil passage 1c, and the cylinder block of the oil leakage recovery oil passage 2a is formed. 2 A connecting pipe joint 7 is interposed between the opening on the upper surface and the opening of the oil leakage recovery oil passage 1c on the lower surface of the cylinder head 1, and the oil leakage recovery oil passages 1c and 2a are connected to each other. Communicate.

  With such an oil passage configuration, the fuel leakage oil in the fuel injection valve housing portion 1a is passed through the oil leakage recovery oil passages 1b and 1c in the cylinder head 1 and the connecting pipe joint 7 in the cylinder block 2. 4 is provided in the outer surface of the cylinder block 2 and is provided with an outlet terminal communicating with the oil recovery oil passage 2a. The oil recovery pipe shown in FIG. 15 is connected. (Not shown in FIG. 1)

  Thus, since the oil leakage recovery pipe 15 is connected to the cylinder block 2, when the cylinder head 1 is removed from the cylinder block 2 for maintenance of a piston (not shown) or the like, the conventional cylinder head 1 It is no longer necessary to remove the oil leakage recovery pipe 15 as in the case where it is connected to.

Next, a piping structure for supplying starting air to the starting valve of each cylinder head in a conventional multi-cylinder diesel engine will be described with reference to FIGS.
In this diesel engine, as a starting means, air is sent to each cylinder and the piston is slid by air pressure. The cylinder head 1 of each cylinder is provided with a start valve 8 for opening the valve appropriately and sending air to each cylinder. The start valve 8 is commonly used for supplying start air to the start valve 8. A start air main pipe 16 for supplying air to the cylinder head 1 is piped. The side surface of the start valve 8 attached to the cylinder head 1 is a control side surface. The fuel injection pump 4 is also provided. Conventionally, the lower side of the start valve mounting portion of the cylinder head 1 is substantially continuous with the outer surface of the cylinder block 2, and there is no start between the fuel injection pump 4 and the cylinder head 1 disposed in close proximity thereto. There is no space for providing a pipe for supplying air and an air passage to the start valve 8. Therefore, conventionally, the start air main pipe 16 is piped outside the fuel injection pump 4, and the start air inlet 18 from the start air main pipe 16 to each start valve 8 is above the fuel injection pump 4. A long branch pipe 17 straddling the pipe was piped and bolted to the starting air inlet 18.

  On the other hand, in the conventional piping structure for supplying starting air to the starting valve, the structure of the branch pipe 17 branched from the starting air main pipe 16 is complicated, and the plurality of bolts 19 are also used for the starting air inlet 18. When the cylinder head 1 is removed from the cylinder block 2 in maintenance work, the work of removing the bolts 19 becomes complicated. Further, on the control side of the diesel engine where the fuel injection pump 4 is disposed, the fuel injection pipes from the fuel injection pumps 4 (see the fuel injection pipes 5 in FIGS. 1 and 3 to be described later) are not limited. In addition to being piped to the cylinder head 1, a starting air main pipe 16 is piped in front of the fuel injection pump 4, and branch pipes 17 are also conspicuously extended to each cylinder head 1. . I want to avoid such a situation where complicated piping is noticeable.

  In this configuration, a start valve for sending start air to the cylinder head of each cylinder in a multi-cylinder diesel engine is provided, and the start valve mounting portion of each cylinder head extends outward from the outer surface of the cylinder block. And pipe a starting air pipe so that it crosses directly under the extended part of all cylinder heads, and bolts it to the lower surface of each extended part, and within the extended part of each cylinder head. In addition, an air passage for guiding the air introduced from the start air pipe around the bolt to the start valve is provided.

A piping structure for supplying start air to the start valve in the multi-cylinder diesel engine will be described with reference to FIGS.
First, as shown in FIG. 3, the start valve 8 is arranged. In the cylinder block 2 of the diesel engine, on the upper part of the cylinders (inside the cylinder liner 3) arranged in parallel in the crankshaft direction, Each of the cylinder heads 1, 1... Is disposed, and a fuel injection pump for supplying fuel to each cylinder on the front side as viewed from the steering side surface (front surface) of each cylinder head 1. The fuel injection pipes 4 are respectively provided in the cylinder heads 1 from the fuel injection pumps 4 so that the fuel injections fit into the cylinder heads 1 as described in FIG. Connected to valve 6.

  The start valve 8 is horizontally fitted in each cylinder head 1 at a position offset laterally from the fuel injection pump 4 in a front view, and a pilot pressure air pipe 9 is extended from the operation side surface. Yes. The pilot pressure of the start valve 8 is air pressure, and as shown in FIG. 2, when pilot pressure air is introduced from the pilot pressure air pipe 9, the start valve 8 is pushed and slides, and a start-up air pool is obtained. 8a and the start air discharge path 1g are opened and communicated, and start air stored in the start air reservoir is discharged into the cylinder liner 3 via the start air discharge path 1g. The piston 13 in the cylinder liner 3 is pushed downward.

  The supply timing of the pilot pressure air to the pilot pressure air pipe 9 in each start valve 8 is controlled by a pilot pressure air control device provided at the end of the camshaft, and the supply timing of the pilot air pressure to each start valve 8 is changed to each fuel. Similarly to the fuel injection timing in the injection pump 4, the pistons 13 of all the cylinders are interlocked to rotate the crankshaft and the camshaft, and the fuel injection pump 4 and the valve are driven. The supply source of the pilot pressure air is by a common air tank with the starting air described later, and is supplied by a compressor provided separately from the diesel engine.

Next, a structure for supplying start-up air to the start valve 8 will be described.
First, this structure is based on the premise that the lower portion of the start valve 8 mounting portion on the control side of the cylinder head 1 extends outward from the control side of the cylinder block 2. In A, a space for screwing bolts 12 described later and a space for forming start air passages 1d, 1e, and 1f can be secured. Further, the extending portion A is on the rear side of the fuel injection pump 4 when viewed from the engine steering side (that is, the state shown in FIG. 3).

  Then, a single starting air pipe 10 (corresponding to the conventional starting air main pipe 16) is provided so as to cross the horizontal lower surface of the extended portion of all the cylinder heads 1. When viewed from the engine control side, the starting air pipe 10 is not connected to the front side of the fuel injection pump 4 but on the rear side of the fuel injection pump 4 like the conventional starting air main pipe in FIG. Yes.

  An opening 10a is formed in the upper part of the starting air pipe 10 at a position directly below the extending part A of each cylinder head 1, and a communication joint 11 is provided around the opening 10a. The connection joint 11 is fixed to the start-up air pipe 10 by screwing a bolt 12 upward from the lower side, and the connection joint 11 passes through the opening 10a. By being screwed into the extension part A, the extension part A is also fixed.

  Further, the communication joint 11 is formed with a starting air passage 11a in a vertically upward direction so as to surround the bolt 12 screwed in this manner, and communicates with the opening 10a of the starting air pipe 10. In the extending portion A, a vertical starting air passage 1d surrounding the bolt 12 is also provided. In the extended portion A, a horizontal start air passage 1e and a vertical start air passage 1f are bored from the start air passage 1d, and a start air reservoir provided in the start valve 8 is provided. 8a is communicated. Thus, the start air is supplied from the start air pipe 10 to the start air reservoir 8a of the start valve 8, and the start valve 8 is opened by the pilot pressure air, via the start air discharge passage 1g. It is discharged into the combustion chamber in the cylinder liner 3.

  When the structure for supplying the starting air to the starting valve 8 as described above is compared with the conventional structure shown in FIG. 5, first, as described above, the starting air pipe 10 is fuel-injected as viewed from the engine operation side. Since piping is provided on the rear side of the pump 4, the piping of the starting air pipe 10 itself is not conspicuous, and the branch pipe 17 accompanying the piping on the front side of the fuel injection pump 4 as shown in FIG. It is not necessary to connect the pipe before the injection pump 4, and the pipe is clean. Further, since the starting air pipe 10 is piped directly under the extension part A of each cylinder head 1, a joint 11 is provided directly under each extension part A, and each extension part is formed with a single bolt 12. If it is fastened together with A, the piping is completed, and the air supply structure from the start air pipe 10 to the start valve 8 corresponding to the conventional start air main pipe 16 is also the start air passage 1d.1e. -By providing 1f in the extension part A, it is not necessary to connect a connecting pipe such as the conventional branch pipe 17 from the starting air pipe 10 corresponding to the starting air main pipe 16. Therefore, as compared with the conventional structure in which the branch pipe 17 is fastened to each cylinder head 1 with a plurality of bolts, the piping work is also simplified.

  And, by adopting a piping structure for starting air supply of a multi-cylinder type diesel engine, the starting air pipe is located on the lower side of the starting valve, which is the rear side of the fuel injection pump, as viewed from the engine operation side as in the past. Piping directly under the cylinder head extension and it is not noticeable. The cylinder head is fixed with bolts, and an air passage is provided around the bolt at the extension. Thus, there is no need to connect a branch pipe to the cylinder head from the starting air pipe. Thus, the piping structure relating to the start-up air supply is greatly simplified, the piping work is facilitated, and the appearance is neat.

It is a partial side sectional view of a diesel engine showing an oil passage for oil leakage recovery from a fuel injection valve. It is a partial side sectional view of a diesel engine which shows a starting air supply piping structure. Similarly it is a partial front view. It is a partial side sectional view of a diesel engine showing an oil passage and piping for oil leakage recovery from a conventional fuel injection valve. It is a partial side view of the diesel engine which shows the conventional starting air supply piping structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder head 1a Fuel-injection-valve housing part 1b Oil leak collection oil path 1c Oil leak collection oil path 1d Start air path 1e Start air path 1f Start air path 1g Start air discharge path A Extension part 2 Cylinder Block 2a Oil leakage recovery passage 3 Cylinder liner 4 Fuel injection pump 5 Fuel injection pipe 6 Fuel injection valve 7 Connection pipe joint 8 Start valve 8a Start air reservoir 9 Pilot pressure air pipe 10 Start air pipe 10a Opening 11 Contact Joint 11a Start air passage 12 Bolt 13 Piston 14 Outlet terminal 15 Oil leakage recovery pipe

Claims (1)

In order to collect the oil leakage from the fuel injection valve 6 fitted in the cylinder head 1 of the diesel engine, the oil passage 1b for oil recovery is drilled horizontally from the fuel injection housing 1a provided in the cylinder head 1. Furthermore, an oil leakage recovery oil passage 1c is drilled vertically downward from the oil leakage recovery oil passage 1b, an outlet is opened on the lower surface of the cylinder head 1, and the cylinder block 2 disposed below the cylinder head 1 is opened. In addition, in order to communicate with the oil leakage recovery oil passage 1c, a vertical oil leakage recovery oil passage 2a is drilled, an opening in the upper surface of the cylinder block 2 of the oil leakage recovery oil passage 2a, An outlet terminal communicating with the oil leakage recovery oil passage 2a is provided on the outer surface of the cylinder block 2 so as to communicate with the opening of the oil leakage recovery oil passage 1c on the lower surface of the cylinder head 1, and the outlet terminal is provided with the outlet terminal. Connecting the leaked oil recovery pipe 15 Leaked oil recovery piping structure of the diesel engine and features.

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