Intake module

An intake module for distributing intake air among a plurality of intake manifolds connected to an engine, the module comprising:

• a surge tank having a container-like shape;
• a plurality of inflow ports formed from resin integrally with the surge tank and aligned in one direction of the surge tank, wherein each of the plurality of inflow ports is connected to a corresponding one of the plurality of intake manifolds;
• an intake air leading portion formed at one end portion of the surge tank in a certain direction and leading intake air into the surge tank, wherein:
• the certain direction is generally perpendicular to the one direction in which the plurality of inflow ports is aligned;
• and
• the certain direction is generally perpendicular to a flow direction of air flowing into the plurality of inflow ports;
• and
• a return pipe portion disposed at the other end portion of the surge tank in the certain direction, such that the plurality of inflow ports is located between the intake air leading portion and the return pipe portion, wherein the return pipe portion communicates between the surge tank and an exhaust pipe portion, through which exhaust air discharged from the engine flows, and projects into an inside of the surge tank, so that exhaust air in the exhaust pipe portion is returned into the inside of the surge tank through the return pipe portion, wherein:
• the return pipe portion is disposed near a sidewall of the surge tank located on an opposite side of the intake air leading portion in the certain direction;
• the return pipe portion protects into the inside of the surge tank in a direction that is generally parallel to the one direction in which the plurality of inflow ports is aligned;
• the return pipe portion includes:
• a cylindrical portion defining a return passage through which exhaust air flows;
• a branch portion branching from the cylindrical portion radially outward of the cylindrical portion to communicate with the inside of the surge tank;
• a wall portion formed at an end portion of the cylindrical portion on a surge tank-side, wherein:
• the wall portion has an opening on a sidewall-side;
• and
• the wall portion blocks an end portion of the return passage on the surge tank-side except the opening;
• and
• a projecting plate portion having a plate-like shape and extending from the end portion of the cylindrical portion on the surge tank-side along the sidewall in a direction that is generally parallel to the one direction in which the plurality of inflow ports is aligned, wherein the projecting plate portion has a hole portion penetrating through the projecting plate portion in a thickness direction thereof.