Abstract: An inlet system includes an intake manifold and an EGR inlet projecting into and received in the manifold through an insertion portion of the manifold. A leading end of the inlet is inserted into the manifold through the insertion portion, projecting to reach a target position. An insertion portion opening diameter, which is an opening diameter of one side of the insertion portion, is larger than an insertion maximum occupying diameter that is a maximum distance between a point included in a cutting surface of the inlet on a reference plane perpendicular to an insertion portion axis and a point included in a vertical projection view of the leading end. A distance between the plane and a nearest point of the leading end to the plane in an axial direction is equal to an insertion portion opening depth, which is a length of the insertion portion in the axial direction.

Abstract: An inlet system includes an intake manifold and an EGR inlet projecting into and received in the manifold through an insertion portion of the manifold. A leading end of the inlet is inserted into the manifold through the insertion portion, projecting to reach a target position. An insertion portion opening diameter, which is an opening diameter of one side of the insertion portion, is larger than an insertion maximum occupying diameter that is a maximum distance between a point included in a cutting surface of the inlet on a reference plane perpendicular to an insertion portion axis and a point included in a vertical projection view of the leading end. A distance between the plane and a nearest point of the leading end to the plane in an axial direction is equal to an insertion portion opening depth, which is a length of the insertion portion in the axial direction.

Abstract: A bearing support device includes a rotor, a bearing member, and a bearing holding member. The rotor rotates about a rotation center axis. The bearing member rotatably supports the rotor within a bearing hole passing through the bearing member. The bearing holding member holds the bearing member in a secure manner within a fitting hole that passes through the bearing holding member along the center axis of the rotor via an engagement force produced by tightly fitting the bearing member. The rotor and bearing member are made of a resin. An engagement section is provided for tightly fitting the bearing member into the fitting hole relative to the bearing hole to enable an engagement force produced by the tight fitting to act in a direction that does not affect an inner diameter dimension of the bearing hole.

Abstract: A bearing support device includes a rotor, a bearing member, and a bearing holding member. The rotor rotates about a rotation center axis. The bearing member rotatably supports the rotor within a bearing hole passing through the bearing member. The bearing holding member holds the bearing member in a secure manner within a fitting hole that passes through the bearing holding member along the center axis of the rotor via an engagement force produced by tightly fitting the bearing member. The rotor and bearing member are made of a resin. An engagement section is provided for tightly fitting the bearing member into the fitting hole relative to the bearing hole to enable an engagement force produced by the tight fitting to act in a direction that does not affect an inner diameter dimension of the bearing hole.

Abstract: A suction device used for an internal combustion engine includes a throttle passage, which is arranged on the upstream side, and also includes an air connector, a surge tank and suction manifolds which are arranged on the downstream side of the throttle passage. An opening section of the air connector arranged in the longitudinal direction on a side wall face of the surge tank is provided on a wall face corresponding to a position which becomes a substantial center of the suction manifold which is open to the surge tank. Due to the foregoing, intake air can be evenly distributed to the suction manifold, and lengths of the passages can be made equal to each other. Accordingly, the generation of a rumbling noise can be suppressed. Further, the suction manifold substantially encircles the outer circumferential wall faces of the surge tank and others.

Abstract: A suction device used for an internal combustion engine includes a throttle passage, which is arranged on the upstream side, and also includes an air connector, a surge tank and suction manifolds which are arranged on the downstream side of the throttle passage. An opening section of the air connector arranged in the longitudinal direction on a side wall face of the surge tank is provided on a wall face corresponding to a position which becomes a substantial center of the suction manifold which is open to the surge tank. Due to the foregoing, intake air can be evenly distributed to the suction manifold, and lengths of the passages can be made equal to each other. Accordingly, the generation of a rumbling noise can be suppressed. Further, the suction manifold substantially encircles the outer circumferential wall faces of the surge tank and others.

Abstract: A speed reduction gear including a semicircular control gear is provided coaxially with a motor shaft between a motor and a throttle valve. A connecting lever which has a valve opening contact and a valve closing contact is secured to a shaft of the throttle valve. When the control gear turns in the valve closing direction, it engages with the valve closing contact, and the throttle valve is closed. A safety stopper and its actuator are also provided. When the control gear turns in the valve opening direction while the stopper is driven by the actuator to extend in the path of the control gear, the control gear is prevented from further turning in the valve opening direction. When a cruise control switch is turned on, the stopper is retracted by the actuator from the passage and the gear turns in the valve opening direction until it abuts the valve opening contact of the connecting lever, which opens the throttle valve.