Air intake system with composite throttle body

摘要

An air intake system for an internal combustion engine. The air intake system includes an intake manifold (24) with a throttle body (22) mounted thereto. The intake manifold (24) and throttle body housing (26) are both formed primarily from a plastic or composite material. A snap-fit joint secures the throttle body (22) to the intake manifold (24). The joint includes a pair of mounting flanges (46,48), with the throttle body flange (46) including a set of lugs (54), and the manifold flange (48) including cutouts (56) and ramps (58) for receiving the lugs (54). The throttle body flange (46) also includes a loop hook (76) and gasket (52), which mate, respectively, with retention surfaces (84) and a sealing surface (70) on the manifold flange (48). The throttle body (22) also includes a main bore extension (62) with pilots (66) that mate with an entrance region (68) in the manifold (24).