| 摘要 |
PROBLEM TO BE SOLVED: To improve the engine response and to enhance the stirring state of intake air and fuel to improve the combustion efficiency by providing a fuel injection valve with the injecting direction turned to a crank chamber on the lead valve downstream side of the circumferential wall of an intake port. SOLUTION: An intake port 5 is protrusively provided on one upper side of the outside of a crank wheel 3 within a crank chamber 4 containing the crank wheel 3. A fuel injection valve 17 is mounted on the lower surface of the circumferential wall of the intake port 5 with the injecting direction being turned between the lower end of a cylinder 11 and the circumference of the crank wheel 3. According to this, the fuel mixed with lubricating oil is collided to the lower half of a connection rod 18 and the circumferential part of the crank wheel 3 every injection and carried to a bearing 19 and a crank pin 2a through a lubricating cutout 20 to sufficiently and regularly lubricate and cool them. Another lubricating cutout 20 is also formed in the small end part 18a of the connection rod 18, so that the bearing 19 and the crank pin 2a can be sufficiently lubricated with the injected atomized mixed fuel.
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