Intake manifold

An intake manifold to be mounted on an engine, the intake manifold having an intake passage through which intake air is supplied from a throttle device to each cylinder of the engine, comprising:

• a resin member;
• and
• a metal member combined with and holding the resin member so as to overlap the resin member on a side opposite to the engine so that the resin member and the metal member constitute the intake passage, the metal member being provided with fittings for mounting the intake manifold on the engine, wherein the intake air introduction passage comprises an intake conduit, a volume chamber located adjacent to the intake conduit and communicating with the intake conduit and a plurality of joints arranged at given space intervals along an axis of the volume chamber and communicating with the volume chamber, and each of the intake air distribution passages is connected to each of the joints.

An intake manifold to be mounted on an engine, the intake manifold having an intake passage through which intake air is supplied from a throttle device to each cylinder of the engine, comprising:

• a resin member;
• and
• a metal member combined with and holding the resin member so as to overlap the resin member on a side opposite to the engine so that the resin member and the metal member constitute the intake passage, the metal member being provided with fittings for mounting the intake manifold on the engine, wherein the intake air introduction passage is located between the cylinders of the engine and the respective intake air distribution passages extend alternately in opposite directions so as to cross an axis of the intake air introduction passage to distribute intake air to the respective cylinders of the engine.

An intake manifold for distributing intake air to cylinders of an engine, comprising:

• a resin intake air introduction portion for defining at least a portion of an intake passage of the intake manifold through which intake air is supplied from a throttle device for distribution to each cylinder of the engine;
• and
• a metal intake air distribution portion disposed to overlap substantially and entire surface of said resin intake air introduction portion on a side thereof opposite to the engine and cause a surface of the resin intake air introduction portion on a side of the engine to directly face the engine, said metal intake air distribution portion being fastened to the engine to mount the combination of the metal and resin portions on the engine, whereby the metal intake air distribution portion shields noises transmitted to the resin intake air introduction portion so as to reduce noise emission to an exterior of the intake manifold.

An intake manifold for distributing intake air to each cylinder of an engine, comprising:

• a resin intake air introduction portion for defining at least a portion of an intake passage of the intake manifold through which intake air is supplied from a throttle device for distribution to each cylinder of the engine;
• and
• a metal intake air distribution portion disposed to overlap said resin intake air introduction portion on a side thereof opposite to the engine, said metal intake air distribution portion being fastened to the engine whereby the metal intake air distribution portion shields noises transmitted to the resin intake air introduction portion so as to reduce noise emission to an exterior of the intake manifold, wherein the resin intake air introduction portion defines a generally semi-circular lower intake pipe portion and said metal intake air introduction portion defines a generally semi-circular upper intake pipe portion which defines together with said lower intake pipe portion an intake pipe of said intake manifold.