JP-7855978-B2 - Internal combustion engine

JP7855978B2JP 7855978 B2JP7855978 B2JP 7855978B2JP-7855978-B2

Inventors

穴田剛大

Assignees

日産自動車株式会社

Dates

Publication Date: 20260511
Application Date: 20220921

Claims (6)

The system comprises a cylinder head, a rocker cover covering the upper surface of the cylinder head, and an intake duct having a lower mating surface portion located below the mating surface between the cylinder head and the rocker cover. The lower part of the mating surface is located above a predetermined high-temperature component attached to the internal combustion engine, and is characterized by having a recess capable of receiving oil dripping from the mating surface.
The internal combustion engine according to claim 1, characterized in that the recess is formed to overlap with the entire area where the mating surface and the high-temperature component overlap in a plan view of the internal combustion engine.
The internal combustion engine according to claim 1, characterized in that the recess is formed by a protruding rib provided on the outer circumferential surface of the lower part of the mating surface of the intake duct.
The internal combustion engine according to claim 3, characterized in that the ribs are formed in the lower part of the mating surface, which is positioned along the side surface of the internal combustion engine, so as to extend along the direction of the cylinder row of the internal combustion engine.
The internal combustion engine according to claim 3 or 4, characterized in that the above-mentioned rib is fixed by welding to the lower part of the mating surface.
The internal combustion engine according to claim 1, characterized in that the above-mentioned high-temperature component is an alternator.

Description

This invention relates to an internal combustion engine. Patent Document 1 discloses an internal combustion engine in which a trough portion is integrally formed on the gasket body, which forms the main part of the exhaust manifold gasket interposed between the cylinder head and the exhaust manifold. The trough portion extends into the space where the head cover and the secondary air distribution pipe are close together. In this internal combustion engine of Patent Document 1, oil leaking and dripping from between the cylinder head and head cover falls into the trough portion. Japanese Patent Publication No. 2005-299564 A schematic diagram illustrating the general configuration of an internal combustion engine to which the present invention is applied.A schematic diagram illustrating the intake system of an internal combustion engine to which the present invention is applied.A perspective view of the downstream third duct of an internal combustion engine to which the present invention is applied.An explanatory diagram showing an enlarged view of section A in Figure 1.This is an explanatory diagram schematically showing a cross-section along the line B-B in Figure 4. An embodiment of the present invention will be described in detail below with reference to the drawings. Figure 1 is a schematic diagram illustrating the general configuration of an internal combustion engine 1 to which the present invention is applied. Figure 2 is a schematic diagram illustrating the intake system 8 of the internal combustion engine 1 to which the present invention is applied. Figure 3 is a perspective view of the downstream third duct 17 of the internal combustion engine 1 to which the present invention is applied. Figure 4 is an enlarged explanatory diagram of section A in Figure 1, illustrating the main parts of the internal combustion engine 1 to which the present invention is applied. Figure 5 is a schematic explanatory diagram illustrating a cross-section along the line B-B in Figure 4, showing the internal combustion engine 1 as viewed from the crankshaft axis direction. As shown in Figure 1, the internal combustion engine 1 is, for example, a multi-cylinder in-line internal combustion engine, and includes a cylinder head 2, a cylinder block 3 attached to the lower part of the cylinder head 2, a rocker cover 4 covering the upper surface of the cylinder head 2, an oil pan 5 attached to the lower part of the cylinder block 3, and a front cover 6 covering the front of the internal combustion engine body 7. The cylinder head 2, cylinder block 3, rocker cover 4, and oil pan 5 constitute the internal combustion engine body 7. Furthermore, the internal combustion engine 1 includes an intake system 8 connected to the cylinder head 2, and an alternator 9 that transmits the rotation of the crankshaft (not shown) of the internal combustion engine 1 via a belt (not shown). The alternator 9 corresponds to a predetermined high-temperature component attached to the internal combustion engine 1. The cylinder head 2 has an intake port (not shown) for supplying intake air to the combustion chamber (not shown) and an exhaust port (not shown) for discharging exhaust gas from the combustion chamber (not shown). The cylinder block 3 has a number of cylinders (not shown) corresponding to the number of cylinders in the engine. The rocker cover 4 is made of a synthetic resin material such as polyamide, and is fixed to the upper surface of the cylinder head 2 with bolts (not shown) via a gasket (not shown). The mating surface 11 between the upper surface of the cylinder head 2 and the rocker cover 4 is located above the intake system 8 in the vertical direction of the internal combustion engine 1 (vertical direction in Figure 1). The oil pan 5 is made of a metal material such as aluminum alloy, and together with the cylinder block 3, constitutes the crankcase (not shown) in which the crankshaft (not shown) is housed. The front cover 6 is made of a synthetic resin material such as polyamide, and is liquid-tightly attached to the internal combustion engine body 7 so as to cover the front surface of the internal combustion engine body 7. As shown in Figures 1 and 2, the intake system 8 includes an air cleaner 12, an upstream intake duct 13 located upstream of the air cleaner 12, and a downstream intake duct 14 located downstream of the air cleaner 12, supplying intake air to the internal combustion engine 1. The upstream intake duct 13 and the downstream intake duct 14 are made of a synthetic resin material, such as polyamide. The downstream intake duct 14 is a cylindrical duct and comprises a downstream first duct 15, a downstream second duct 16, and a downstream third duct 17 as the lower part of the mating surface. The downstream first duct 15 has its downstream first end 15a, located downstream in the intake airflow direction, connected to the cylinder head 2 via a throttle chamber (not shown) and an intake manifold (not shown). Its upstream fir