Multi-cylinder internal combustion engine

Abstract

A multi-cylinder internal combustion engine includes an intake manifold having branch pipes connected to one side of a cylinder head and curved to allow the intake manifold to extend to directly above a cylinder-head cover, and intake-side spark plugs and fuel injectors which are incorporated in the cylinder head. The spark plugs are disposed outside a valve train chamber on a side of the valve train chamber where curved portions of the branch pipes are disposed, and the fuel injectors and ignition coils provided above the spark plugs are disposed between the valve train chamber and the curved portions in a direction normal to axes of the cylinders as viewed from a direction in which cylinders are arranged. The ignition coils are disposed so as not to overlap the branch pipes as viewed from a direction in which the ignition coils are attached to the cylinder head.

Description

[0001] This application is a divisional application of the application No. 02119903.5 filed on May 15, 2002. technical field [0002] The present invention relates to a multi-cylinder internal combustion engine in which spark plugs, ignition coils and fuel injectors are arranged, the intake manifold of which has branch pipes connected to and bent at one side of the cylinder head, Thus enabling the manifold to extend directly above the cylinder head cover. Background technique [0003] Generally, in order to realize the configuration of a compact intake manifold, a multi-cylinder internal combustion engine has been proposed in which branch pipes of the intake manifold are bent, thus enabling the manifold to extend directly above the cylinder head cover, one example of which discloses In JP-A_10-176453. In the disclosed internal combustion engine, the intake manifold connected to one side of the cylinder head is bent at the side of the cylinder head cover so as to extend vert...

AI Technical Summary

Problems solved by technology

Therefore, the surge tank is positioned higher than the cylinder head cover to such an extent that the ignition coil protrudes upward from the cylinder head cover in the axial direction of the cylinder, thus causing a problem that the overall height of the internal combustion engine increases

In addition, maintenance of the ignition coil requires the removal of the surge tank, thus causing another problem that the efficiency of the maintenance work is reduced

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