BigPatents India

The fluid pump structure features that: a cooling water pump casing 9 having magnetism transmitting performance is fixedly attached to an engine body 4; a driven sprocket 71 is rotatable in response to the operation of an overhead 4-stroke single cylinder internal combustion engine 1 and is rotatably fitted around a rotor housing 63 of the cooling water pump casing 9; a casing of a cooling water pump 73 is constituted by a partition 7 in contact with the periphery of an open end of the pump casing 9, and the rotor housing 63 of the pump casing 9; an impeller 67 and a pump rotating shaft 66 are rotatably supported in the pump casing; and magnets 68 and 72 having negative and positive poles alternately and circumferentially arranged are integral with an outer surface of the impeller 67 and an inner surface of a driven sprocket 71.