To suppress as much as possible a crack occurrence of a combustion chamber around an ignition plug, in which an ignition timing of a multi-point ignition engine is early.
A rotary housing of an rotary piston engine 12 is provided with an inserting port 31 and a boss 32 for an ignition plug whose ignition timing is quick, and an ignition port 41 and a boss 42 for ignition plug whose ignition timing is slow. The engine is a multi-plug engine where each plug can independently ignite respectively. Only the boss 32 for the ignition plug whose ignition timing is early is provided with a heat radiating fin 34. Therefore, cooling efficiency around the ignition plug whose ignition timing is quick becomes higher, compared with the cooling efficiency around the ignition plug whose ignition timing is slow so that the cooling efficiency improves, and the crack around the ignition plug whose ignition timing is quick can be prevented from occurring.
| JP6281589 | A control device of a multi-ignition type engine |
| WO/2019/173144 | CONTINUOUS MOTION REVOLVING PISTON ENGINE |
| JP2015504999 | Rotary piston engine |
KOTO HIDEAKI
SHIMIZU NORIJI
HASHIGUCHI TADASHI
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