Abstract: A rotary valve body has a first passage and changes a communication state between the first passage and a second passage. A housing has the second passage and defines a valve chamber in which a valve body is accommodated and in which the second passage is opened. A sealing member having a third passage is compressed between an outer surface of the valve body and an inner wall surface defining the valve chamber. The sealing member is in pressure contact with the outer surface of the valve body and the inner wall surface defining the valve chamber at a peripheral edge of an opening on one side of the third passage and at a peripheral edge of an opening on the other side, respectively. A diameter of the third passage is maximized at one of the opening on one side and the opening on the other side.

Abstract: The intake system has a valve seat, a plate valve, and an elastic sealing member. A path is provided to pass through the valve seat and to communicate with an intake passage of an internal combustion engine. The plate valve fits to or separates from the valve seat to close or open the path. The plate valve is provided with through holes passing through the plate valve in the thickness direction at a valve periphery part. The through holes are arranged linearly one after another in a peripheral direction of the plate valve to be offset to each other in the direction perpendicular to the peripheral direction. The elastic sealing member includes an elastic covering part that covers a first surface and a second surface of the plate valve and elastic coupling parts that are disposed in the through holes and are coupled with the elastic covering part at the first surface and the second surface.

Abstract: The intake system has a valve seat, a plate valve, and an elastic sealing member. A path is provided to pass through the valve seat and to communicate with an intake passage of an internal combustion engine. The plate valve fits to or separates from the valve seat to close or open the path. The plate valve is provided with through holes passing through the plate valve in the thickness direction at a valve periphery part. The through holes are arranged linearly one after another in a peripheral direction of the plate valve to be offset to each other in the direction perpendicular to the peripheral direction. The elastic sealing member includes an elastic covering part that covers a first surface and a second surface of the plate valve and elastic coupling parts that are disposed in the through holes and are coupled with the elastic covering part at the first surface and the second surface.

Abstract: An intake module includes a surge tank, inflow ports formed from resin integrally with the tank and aligned in one direction of the tank, an intake air leading portion formed at one end portion of the tank in a certain direction and leading intake air into the tank, and a return pipe portion. Each of the ports is connected to a corresponding intake manifold. The certain direction is generally perpendicular to the one direction, and to a flow direction of air flowing into the ports. The return pipe portion is disposed at the other end portion of the tank in the certain direction. The ports are located between the leading portion and the return pipe portion. The return pipe portion communicates between the tank and an exhaust pipe portion, and projects into an inside of the tank. Exhaust air is returned into the tank through the return pipe portion.

Abstract: An air intake device has a surge tank and an intake manifold for distributing intake air between cylinders of an in-line cylinder engine. Manifold pipes of the intake manifold are aligned in a longitudinal direction of the surge tank and disposed substantially perpendicular to a first wall of the surge tank. A first end of each manifold pipe is connected to the first wall of the surge tank and a second end of each manifold pipe is to be connected to the corresponding cylinder. The first end of each manifold pipe has a protruded portion that is protruded in the surge tank through the first wall and has a funnel shape in which an opening increases toward its end. An opening area of the end of the protruded portion is varied between the manifold pipes in accordance with velocity of the intake air flowing toward the end of each protruded portion in the surge tank.

Abstract: An intake module includes a surge tank, inflow ports formed from resin integrally with the tank and aligned in one direction of the tank, an intake air leading portion formed at one end portion of the tank in a certain direction and leading intake air into the tank, and a return pipe portion. Each of the ports is connected to a corresponding intake manifold. The certain direction is generally perpendicular to the one direction, and to a flow direction of air flowing into the ports. The return pipe portion is disposed at the other end portion of the tank in the certain direction. The ports are located between the leading portion and the return pipe portion. The return pipe portion communicates between the tank and an exhaust pipe portion, and projects into an inside of the tank. Exhaust air is returned into the tank through the return pipe portion.