| 摘要 |
A Wankel type rotary engine comprising a rotor housing composed of an inner wall portion defining a trochoidal inner peripheral surface, an outer wall portion, enclosing said inner wall portion and stay portions interconnecting the inner and outer wall portions, while a cooling water passage is defined between the inner and outer wall portions, wherein an oscillation damping layer is provided on at least a part of the surface of the inner wall portion which faces the cooling water passage.
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