Patent ID: 7305958

Claim:
An intake manifold including a collecting pipe and four branch pipes branched from the collecting pipe, the collecting pipe and the branch pipes being molded of resin, the intake manifold comprising: a single gas intake port; a gas outlet port opening into each branch pipe; and a gas passage extending to be divided into four branch passages from the gas intake port to each gas outlet port; wherein the gas passage is configured so that the four branch passages are equal in pressure loss which will be generated between the gas intake port and each gas outlet port, and the gas passage extends to be branched in two stages from the gas intake port to each gas outlet port, forming a tournament-form branch configuration which is symmetrical about the gas intake port, the gas intake port, the gas outlet ports, and the gas passage are provided near outlet ports of the branch pipes and, under an operating condition of the intake manifold, are located on top of the branch pipes so that the gas intake port is placed above the gas outlet ports, and the gas intake port and the gas passage are provided in a projecting section of a flat plate shape formed integrally with the branch pipes and projecting upward.