JPH02252925A - V type eight cylinder engine equipped with supercharger - Google Patents

Abstract

PURPOSE:To prevent the exhaust interference and improve the volume efficiency by connecting an exhaust manifold of each bank with the turbine of a supercharger on the opposite side, keeping a V-figure-shaped bank space, and extending the both exhaust communication pipes from one side of an engine to the other side, crossing each other. CONSTITUTION:In an engine, a plurality of banks which are formed from a plurality of cylinder heads 2 and the cylinder block parts 3 onto which a plurality of cylinder heads 2 are fixed are installed into V-figure form, keeping a bank space 4. Each supercharger 10 is installed behind each bank, and each compressor 11 of each supercharger 10 is connected with an air cooler 12 and each intake manifold 6. In this case, each turbine 15 of each supercharger 10 is connected with an exhaust manifold 5 in each cylinder group which is positioned on the opposite side, keeping the V-figure-shaped bank 4, through each exhaust communication pipe 16. Each exhaust communication pipe 16 is extended from each turbine 15 on one side of the engine to each exhaust manifold 5 on the other side and set cross each other.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a V-type 8-cylinder engine equipped with two superchargers, and in particular to an improved structure for the layout of the turbocharger turbine and exhaust manifold. Regarding.

[Prior Art] In a V-type 8-cylinder diesel engine equipped with two superchargers, each bank, that is, the rear part of each cylinder head extending in the longitudinal direction of the engine and the cylinder block portion to which it is fixed. A supercharger is installed in the The turbochargers of the left and right superchargers are connected to the exhaust manifold in front of them via exhaust connection pipes. That is, the left supercharger is supplied with exhaust gas from the left cylinder group, and the right supercharger is supplied with exhaust gas from the right cylinder group.

[Problem to be solved by the invention] However, in a V8 engine, the volumetric efficiency of each cylinder is strongly affected by exhaust interference, and more specifically, the length of the exhaust passage from the combustion chamber to the supercharger If the length is too short, the volumetric efficiency of each cylinder cannot be sufficiently improved. Therefore. It is desirable that each exhaust connecting pipe be long, but in the conventional structure described above, each exhaust connecting pipe only extends from the supercharger to the exhaust manifold in front of it, so it is difficult to set the length sufficiently large. Have difficulty.

[Means for Solving the Problems] The present invention provides a supercharged V-8 engine of the type described above, in which the exhaust manifold of each bank is connected to the turbine of the supercharger on the opposite side across the bank space. The engine is characterized in that both exhaust connecting pipes extend diagonally from one side of the engine to the other side, intersecting with each other.

Embodiment FIG. 1 is a schematic plan view of an embodiment of the present invention. In this specification, the longitudinal direction of the crankshaft 1 is referred to as the engine longitudinal direction, and the engine width direction perpendicular thereto is referred to as the engine lateral direction. The illustrated engine includes two cylinder heads 2 extending in the front-rear direction and spaced apart in the left-right direction. A bank is formed by each cylinder head 2 and the cylinder block portion 3 to which it is fixed. Both banks are inclined in a V-shape to each other with a V-bank space 4 between them.

Each bank has four combustion chambers R or L arranged in series in the front-rear direction. Each cylinder head 2 has
An exhaust manifold 5 and an intake manifold 6 connected to the corresponding four combustion chambers R or L are provided. The exhaust manifold 5 is located on the opposite side of the V-bank space 4 with respect to the combustion chamber RSL, in other words, it is provided outside the cylinder head 2 in the left-right direction. The intake manifold 6 is provided inside the cylinder head 2 (on the V-bank space 4 side).

A supercharger 10 is provided at the rear of each bank.

The compressors 11 of both superchargers 10 are connected via an intake connecting pipe 13 to the inlet of an air cooler 12 located at the rear of the engine and in the middle in the left-right direction.

The outlet of the air cooler 12 is connected to the inlets of both intake manifolds 6.

The turbine 15 of each supercharger 10 is connected to the outlet at the rear end of the exhaust manifold 5 via an exhaust communication pipe 16. According to the present invention, each turbine 15 is connected to the exhaust manifold 5 of the cylinder group located on the opposite side of the V-bank space 4 . That is, the turbine 15 on the left side of the engine
Connects the exhaust connecting pipe 16 to the exhaust manifold 5 on the right side of the engine.
The turbine 15 on the right side of the engine is connected to the exhaust manifold 5 on the left side of the engine via another exhaust connecting pipe 16. Therefore, both exhaust connecting pipes 16 extend from the turbine 15 on one side of the engine to the exhaust manifold 5 on the other side and intersect with each other.

According to the above configuration, the length of each exhaust connecting pipe 16 can be set to be large, and the length of the exhaust passage leading to the turbine 15 becomes long. Therefore, it is possible to effectively prevent exhaust interference in the exhaust manifold 5 and the exhaust connecting pipe 16, and as a result, the intake air supplied from the supercharger 10 to the combustion chambers R and L is Volumetric efficiency is improved and the range of variation in volumetric efficiency is narrowed.

[Effects of the Invention] As explained above, in the structure of the present invention, the length of the exhaust passage leading to the turbine 15 of the supercharger 10 can be set to be long, thereby preventing exhaust interference in the exhaust passage and increasing the length of each exhaust passage. Engine performance can be improved by improving the volumetric efficiency of the mechanism.

In general, in the field of engines, the side provided with a flywheel is often referred to as the rear part, but in this specification, the front-rear relationship of the engine has nothing to do with the flywheel.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of an embodiment of the present invention. 1... Crankshaft, 2... Cylinder head, 3...
・Cylinder block part, 4...V bank space, 5.
...Exhaust manifold, 6...Intake manifold, 10...Supercharger, 15...Turbine, 16...Exhaust connecting pipe, L...Combustion chamber

Claims (1)

[Claims] A pair of cylinder heads extending in the longitudinal direction of the engine are provided at intervals in the lateral direction of the engine, each cylinder head and the cylinder block portion to which it is fixed form a bank, and each bank has four cylinders located in the front and rear of the engine. The banks are arranged in series in the direction, and both banks are inclined to each other with a V-bank space formed between them, and the intake manifold connected to the combustion chamber in each bank forms a V-bank space with respect to the combustion chamber. The exhaust manifold is located on the opposite side of the combustion chamber from the V-bank space, and the two exhaust superchargers are placed behind the left and right banks, and the turbines of each supercharger are connected to the exhaust. A V-8 with a supercharger connected to the exhaust manifold of either bank via a pipe, and the compressor of each supercharger connected to the intake manifold.
In a cylinder engine, the exhaust manifold of each bank connects to the turbocharger turbine on the opposite side across the V-bank space, and both exhaust connecting pipes cross each other from one side of the engine to the other side. A V-type 8-cylinder engine with a supercharger that is characterized by its diagonal extension.