| 摘要 |
An internal combustion engine 10 comprises a device having a mechanism that moves a cylinder block relative to a crankcase, a worm wheel (wheel) 54 fixed to the mechanism, and a worm 55 meshed with the wheel. The device is disposed at the position in the vicinity of an disposed-face OS1 and within the disposed-face when the disposed-face is viewed from the front. The internal combustion engine drives the worm for rotatably driving the wheel to drive the mechanism. The internal combustion engine has a noise shielding members 61, 62, and 83 arranged so as to cover a meshing portion EG where the wheel and the worm are meshed with each other, when the disposed-face is viewed from the front. The noise generated at the meshing portion is attenuated by the noise shielding member, and propagated to the outside of the internal combustion engine. Consequently, the noise heard at the outside is reduced.
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