Patent ID: 8544426

Claim:
A coolant passage apparatus used for a cooling device of an internal combustion engine in which a circulation channel for a coolant is formed between a fluid passage formed in the internal combustion engine and a radiator, the coolant passage apparatus capable of being disposed between a coolant outlet of said internal combustion engine and a coolant inlet of said radiator, the coolant passage apparatus comprising: a pair of coolant receiving pipes for respectively receiving the coolant from a pair of engine heads in said internal combustion engine, riser pipes adjoining said pair of coolant receiving pipes, a central passage formed between said riser pipes, and a communicating tube for outputting coolant towards the radiator, formed so as to communicate with said central passage, wherein said coolant passage apparatus is formed by joining a plurality of resin moldings which are each individually molded, wherein assuming that a longitudinal line passing through the center of said central passage is A and longitudinal lines passing through the centers of said riser pipes are B respectively, when viewed along an axis of said pair of coolant receiving pipes, angles formed by each of said lines B and said line A, and which are closest to a longitudinal center of said central passage, are obtuse, wherein, when viewed along the axis of said pair of coolant receiving pipes, said riser pipes are respectively molded on both sides of said central passage and incline outwardly from the longitudinal center of said central passage, wherein said plurality of resin moldings includes a first body and a second body, and wherein a junction face is formed between said first body and second body so as to be parallel with a surface along said line A.