Patent ID: 9745916
Date: 2017-08-29
CPC Classifications: F02D,F02F,F02M

Claim:
1. An internal combustion engine including two intake valves provided per one cylinder, an intake port formed in a cylinder head and branched to two for communicating with two intake downstream side openings which are individually opened and closed by said intake valves and a single intake upstream side opening to which an intake system part is connected, a fuel injection valve attached to said intake system part for injecting fuel into said intake port, and a first spray relief portion and a second spray relief portion located near the fuel injection valve, wherein said intake downstream side openings are juxtaposed at an equal height from a mating face of said cylinder head with a cylinder main body; wherein said intake port is configured such that a center position of said intake upstream side opening is offset to one side in a juxtaposition direction of said intake downstream side openings with respect to a center position between said intake downstream side openings in the juxtaposition direction as viewed in plan of said cylinder head, wherein said fuel injection valve disposed at an upper portion of said intake system part is configured such that a fuel injection center axial line thereof is positioned on a central line of the intake system part and the intake upstream side opening, while also being inclined to another side in the juxtaposition direction with respect to a center axial line of said intake downstream side opening as viewed in plan of said cylinder head, wherein a central axis line of the cylinder head passing a cylinder center is inclined with respect to a crankcase such that a first side of the cylinder head is positioned higher than a second side of the cylinder head, wherein the fuel injector valve includes a pair of fuel injection ports, wherein the fuel injection ports carry out fuel injection into two directions which are branched in a broadening manner equally between the one side and the another side of the center axial line, and wherein the first fuel spray relief portion extends to a front end of a main throttle body, and the second fuel spray relief portion is provided in a concave manner at an upper end portion of an inner periphery of a rear portion of an insulator connected to the throttle body in such a manner as to connect to a front end of the first fuel spray relief portion.