Resin intake manifolds and manufacturing process thereof

A resin intake manifold including an intake vessel which is supplied with intake air through an intake air inlet pipe, and a plurality of outlet pipes which are connected on one end to respective cylinders of a multi-cylinder internal combustion engine and on the other end to the intake vessel,

• wherein:
• said resin intake manifold is composed of a pair of half-parts of divided halves of the intake vessel and the outlet pipes divided along a direction of a pipe axis, which are coupled to each other on their coupling faces, and
• the outlet pipes are connected to the intake vessel so that an external wall of the outlet pipes on said other end is integral with an external wall of the intake vessel, the outlet pipes having a portion extending from the intake vessel in a curve with a curve angle in a range of larger than 120° and not larger than 180° in a direction away from the intake vessel, and further extending away from the intake vessel.

A process for manufacturing a resin intake manifold including an intake vessel which is supplied with intake air through an intake air inlet pipe, and a plurality of outlet pipes which are connected on one end to respective cylinders of a multi-cylinder internal combustion engine and on the other end to the intake vessel,

• forming the outlet pipes connected to the intake vessel so that an external wall of the outlet pipes on said other end is integral with an external wall of the intake vessel, and having a portion with a configuration extending from the intake vessel in the same direction as the intake air inlet pipe extending from the intake vessel and in a curve with a curve angle in a range of larger than 90° and not larger than 180° in a direction away from the intake vessel,
• said process further comprising the steps of molding a pair of half-parts of divided halves of the intake vessel and the outlet pipes divided along a direction of a pipe axis, and then coupling the half-parts on their coupling faces.

A resin intake manifold including an intake vessel which is supplied with intake air through an intake air inlet pipe, and a plurality of outlet pipes which are connected on one end to respective cylinders of a multi-cylinder internal combustion engine and on the other end to the intake vessel,

• wherein:
• said resin intake manifold is composed of a pair of half-parts of divided halves of the intake vessel and the outlet pipes divided along a direction of a pipe axis, which are coupled to each other on their coupling faces, and
• the outlet pipes are connected to the intake vessel so that an external wall of the outlet pipes on said other end is integral with an external wall of the intake vessel, and having a portion with a configuration extending from the intake vessel in the same direction as the intake air inlet pipe extending from the intake vessel and in a curve with a curve angle in a range of larger than 90° and not larger than 180° in a direction away from the intake vessel, and further extending away from the intake vessel.

A process for manufacturing a resin intake manifold including an intake vessel which is supplied with intake air through an intake air inlet pipe, and a plurality of outlet pipes which are connected on one end to respective cylinders of a multi-cylinder internal combustion engine and on the other end to the intake vessel,

• forming the intake air inlet pipe so that it is arranged to avoid a member that is disposed on a main body of the intake manifold, by extending horizontally from the intake vessel and by further extending upward, and
• forming the outlet pipes connected to the intake vessel so than an external wall of the outlet pipes on said other end is integral with an external wall of the intake vessel, and having a portion with a configuration extending from the intake vessel in a curve with a curve angle in a range of larger than 90° and not larger than 180° in a direction away from the intake vessel, and further extending away from the intake vessel,
• said process further comprising the steps of molding a pair of half-parts of divided halves of the intake vessel and the outlet pipes divided along a direction of a pipe axis, and then coupling the half-parts on their coupling faces.