Internal combustion engine
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United States of America Patent
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Aug 11, 2020
Grant Date -
Aug 15, 2019
app pub date -
Dec 21, 2018
filing date -
Feb 14, 2018
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An internal combustion engine includes: a cylinder block including a bulkhead formed so as to separate adjacent cylinders; a crankshaft including a counterweight; and a gas-vent hole which is formed in the bulkhead within a radius of rotation of the counterweight when seen from below a piston bottom-dead-center position and an axial direction of the crankshaft, and which communicates between the adjacent cylinders. The counterweight includes at least one of a concave portion and a through-hole formed at at least a part of a region of the counterweight opposed to the gas-vent hole during rotation of the crankshaft. The concave portion hollows in a direction away from the gas-vent hole, the through-hole penetrating through the counterweight in a direction away from the gas-vent hole.
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