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United States of America
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Issued Date -
Mar 5, 2020
app pub date -
Jul 9, 2019
filing date -
Jul 9, 2019
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Abstract
A cylinder structure includes cylinders arranged inline. A cooling channel facing a first side wall of the cylinder structure includes a first inner channel and a first outer channel. The first inner channel is arranged for a first cooling medium to flow through. The first outer channel is away from the first side wall than the first inner channel is, and arranged for a second cooling medium to flow through. A cooling channel facing a second side wall of the cylinder structure includes a second outer channel and a second inner channel. An upstream part of the second outer channel is connected to a downstream part of the first outer channel. The second inner channel is close to the second side wall than the second outer channel is. Connection channels connecting between the second outer channel and the second inner channel are respectively provided at positions facing the cylinders.
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