JPH0772498B2 - Internal combustion engine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an internal combustion engine with a unit injector that does not require a fuel injection pump.

(Prior Art and Problems Thereof) In a conventional diesel engine, since the fuel injection pump is usually arranged on the side of the cylinder block on the air supply side,
For example, the lubricating oil filter and the lubricating oil cooler are separated on the air supply side and the exhaust side of the cylinder block, and they are connected by a pipe or the like.

For this reason, it is not preferable that the auxiliary machines cannot be arranged in a concentrated manner, and that the pipe is cracked due to the vibration of the engine.

(Object of the Invention) It is an object of the present invention to provide an internal combustion engine that can streamline the arrangement of auxiliary machinery of the internal combustion engine and reduce the external shape of the internal combustion engine.

(Structure of the Invention) (1) Technical Means In the present invention, in an in-line multi-cylinder engine with a unit injector, an air supply manifold is provided on a side surface of a cylinder block on the air supply side, and is provided directly below an air supply manifold connected to a turbocharger. The internal combustion engine is characterized in that an intercooler for cooling the supply air with seawater and a lubricating oil cooler for utilizing the seawater flowing through the intercooler are arranged.

(2) Action Since the intercooler and the lubricating oil cooler of the auxiliary machines related to the cooling water of the supply air are concentrated on the supply side of the cylinder block, the arrangement of both auxiliary machines becomes rational and Machines can also be connected easily.

(Embodiment) FIG. 1 is a side view of a diesel engine equipped with a marine in-line 6-cylinder supercharger according to the present invention on the air supply side, in which 10 is a cylinder head, 12 is a cylinder block, 14 is a clutch, and 16 is an exhaust turbo. It is a supercharger. The cylinder head 10 is provided with a unit injector 18 for each cylinder. The unit injector 18 is a combination of a normal fuel injection pump and an injection valve for each cylinder. Therefore, since the unit injector 18 has the function of a fuel injection pump, it is not necessary to provide a separate fuel injection pump as in a normal diesel engine.

Air supply side surface 12a of the cylinder block 12 shown in FIG.
An air supply manifold 20 is provided in the upper part, and an air duct 21 communicating with the air supply manifold 20 is connected to a pipe 22 of the supercharger 16. Immediately below the air duct 21, an intercooler 23, which is an example of accessories, is fixed in a suspended state. This intercooler 23 is supplied with low-temperature seawater from a cooling water pipe 24, as will be described later in detail.
The seawater cools the high-temperature supercharged air passing through the air supply passage 25 in the intercooler 23.

A lubricating oil cooler 26 is provided on the left side of the intercooler 23, and the lubricating oil cooler 26 is located immediately below the air supply manifold 20. Case 27 of lubricating oil cooler 26 (main body)
Is the filter mount 28 fixed to the cylinder block 12.
Installed on the top of the. Two lubricating oil filters 29 are attached to the bottom of the filter mount 28. Between the case 27 of the lubricating oil cooler 26 and the case 30 (main body) of the intercooler 23, a connecting member 31 of, for example, a cast product is installed, and a seawater passage (not shown) in this connecting member 31 is provided. After passing through the intercooler 23, the seawater once flows into the lubricating oil cooler 26 to cool the lubricating oil, and then returns to the intercooler 23 through the seawater passage in the connecting member 31 to return to the seawater discharge pipe. It is designed to be discharged from 32.

A fuel filter 33 is fixed to the left end of the cylinder head 10, and a clutch 14 is provided to the right end of the cylinder block 12 via a flywheel housing 34. A clutch lubricating oil cooler 37 is fixed on the upper surface of the clutch housing 36, and seawater flows into the clutch lubricating oil cooler 37 through a cooling water pipe 38 and is discharged through a cooling water pipe 24.

In FIG. 2, which is a view taken in the direction of arrow II in FIG. 1, an idle gear 40a is attached to a crank gear 40 fixed to a crank shaft (not shown).
The drive gear 41 meshes with the drive gear 41, and a seawater pump 43 and a fresh water pump 44 driven by the drive gear 41 are provided.

The fresh water pump 44 is a pump for circulating the fresh water in a water jacket (not shown) inside the engine. The fresh water sucked into the fresh water pump 44 from the two pipes 45 and the fresh water from the pipe 46 to the water jacket. It is designed to be pumped. 47 is a thermostat. The seawater pump 43 is a pump that supplies low-temperature seawater as cooling water to the freshwater cooler 48, and the seawater pump 43 and the freshwater cooler 48 are connected by a pipe 49. In FIG. 2, 59 is an alternator.

FIG. 3, which is a view taken in the direction of arrow III in FIG. 2, shows the exhaust side surface of the engine, and the fresh water cooler 48 is fixed to the upper surface of the exhaust manifold 52. Case 53 of the thermostat 47
Is fixed to the end surface 54 of the Shimizu cooler 48. The pipe 55 is connected to the supercharger 16. Both pumps 43, 44 are case 56
It is fixed to. The fresh water cooler 48 and the clutch lubricating oil cooler 37 are connected by the cooling water pipe 38, and the sea water after passing through the fresh water cooler 48 is transferred to the clutch lubricating oil cooler 37.
(Figs. 1 and 4).

In the above configuration, the intercooler 23 and the intercooler 23 that cool the supercharged air with the seawater pumped from the seawater pump 43 (FIG. 3) to the air supply side surface of the engine shown in FIG.
Since the lubricating oil cooler 26 that uses seawater after passing through is concentrated, the intercooler 23 and the lubricating oil cooler 26, which are the auxiliary machines that use seawater, are adjacent to each other, and the engine outline Is compact and the appearance of the engine is neat. Further, the connecting member 31 that connects the intercooler 23 and the lubricating oil cooler 26 is shortened, so that cracking of the pipe or the like is prevented as compared with the conventional case where the pipe and the like are connected.

Intercooler 23 and lubricating oil cooler 26 are air supply manifolds
Since it is located directly below 20, the overall height of the engine is low.

(Effects of the Invention) As described above, in the internal combustion engine according to the present invention, the air supply manifold 20 is provided on the side surface 12a on the air supply side of the cylinder block 12.
Is provided, and the auxiliary devices related to the cooling water of the supply air, such as the intercooler 23 and the lubricating oil cooler 26, are arranged directly below the supply air manifold connected to the supercharger 16, so that the following effects are achieved.

Both the intercooler 23 and the lubricating oil cooler 26, which are auxiliary machines that utilize seawater, are adjacent to the side surface on the air supply side of the engine, and the external shape of the engine can be made compact and the external appearance of the engine becomes neat and beautiful. Also, intercooler 23,
The connecting member 31 that connects the lubricating oil cooler 26 can be shortened, and cracking of the pipe can be prevented as compared with the conventional case where the pipe is connected.

(Other Embodiments) (1) The present invention is not limited to the diesel engine with a supercharger as described above, but can be applied to a non-supercharged diesel engine or a gasoline engine.

In the case of a non-supercharged diesel engine, a lubricating oil cooler, a lubricating oil filter, a fuel filter, and a starter motor are placed on the intake side of the engine.

[Brief description of drawings]

FIG. 1 is a side view showing a side surface on the air supply side of a diesel engine with a supercharger adopting the present invention, FIG. 2 is a view taken in the direction of arrow II in FIG. 1, and FIG. 3 is a view taken in the direction of arrow III in FIG. , FIG. 4 is a view on arrow IV of FIG. 10 …… Cylinder head, 12 …… Cylinder block, 20 …… Air supply manifold, 23 …… Intercooler,
26 …… Lubricant oil cooler, 31 …… Coupling member, 43 …… Seawater pump

Claims (2)

[Claims] In an in-line multi-cylinder engine with a unit injector, an air supply manifold is provided on a side surface of a cylinder block on the air supply side, and an intercooler for cooling the air supply with seawater is provided immediately below the air supply manifold connected to a turbocharger. Also, an internal combustion engine is characterized in that a lubricating oil cooler utilizing seawater circulating in the intercooler is arranged. 2. The internal combustion engine according to claim 1, wherein the intercooler and the lubricating oil cooler are connected to each other by a connecting member fixed to their main bodies.