Oil level detection device for internal combustion engine

摘要

An oil level detection device (40; 90; 120; 150) for an internal combustion engine (10), which comprises: a housing (45; 95; 125; 155) permitting entry therein of oil (12); a float (51; 101; 131; 161) provided within the housing and vertically movable with the oil entered in the housing; a switch (46; 96; 126; 156) for performing switching operation in response to the vertical movement of the float within the housing; protrusions (54; 104) provided, on the upper surface (51a) of the float, for preventing the float from sticking to the ceiling (61) of the housing due to viscosity of the oil; and protrusions (49; 129) provided, on the bottom (67; 147) of the housing, for preventing the float from sticking to the bottom of the housing due to viscosity of the oil.