Abstract: A control circuit controls, based on detection values of Hall-effect sensors, an inverter circuit to activate a rotor. After the activation of the rotor, the control circuit controls the rotational speed of the rotor based on the detection value of the Hall-effect sensor. A sensor pin is arranged in a slot between a forward-wound portion and a reverse-wound portion of a U-phase winding. A sensor pin is arranged in a slot between a forward-wound portion and a reverse-wound portion of a V-phase winding. A sensor pin is located on one side in an axial direction with respect to the reverse-wound portion of the U-phase winding. The sensor pins are located respectively at two first positions.

Abstract: A control circuit controls, based on detection values of Hall-effect sensors, an inverter circuit to activate a rotor. After the activation of the rotor, the control circuit controls the rotational speed of the rotor based on the detection value of the Hall-effect sensor. A sensor pin is arranged in a slot between a forward-wound portion and a reverse-wound portion of a U-phase winding. A sensor pin is arranged in a slot between a forward-wound portion and a reverse-wound portion of a V-phase winding. A sensor pin is located on one side in an axial direction with respect to the reverse-wound portion of the U-phase winding. The sensor pins are located respectively at two first positions.

Abstract: Branch pipes (3) of an intake manifold (1) comprise main bodies (3c), a common flange (11b) and pipe shape joining portions (11c) respectively connecting the main bodies (3c) to the flange (11b). By injection molding, the common flange (11b), the joining portions (11c) and a portion of the main bodies (3c) are formed in one piece as a first component (11), and the remaining portion of the main bodies (3c) is formed in one piece as a second component (12). A notch that has a metal mold draft angle (11d) is formed on the inner circumference of joining portion (11c) and the flange (11b). Filling the notch by using an adjusting member (22) when attaching the intake manifold (1) to an engine through the flange (11b) compensates for changes in shape of a passage cross section caused by the draft angle. A constant passage cross section is thus maintained.

Abstract: An engine air intake manifold has two main body sections that are divided along an airflow direction and mated tightly against each other at oppositely facing mating parts so as to form an air intake passage therein. A gas passage is formed along the mating parts. The gas passage opens into a downstream portion of the air intake passage and supplies a secondary additive gas thereto. Preferably, the engine air intake manifold has air intake branch pipes with valve mounting blocks for mounting air intake control valves to a downstream portion of the air intake branch pipes.

Abstract: An intake arrangement for an internal combustion engine, including an intake manifold including an intake collector and a plurality of branch pipes connected with the intake collector. The branch pipes extend in substantially same direction. The intake collector includes an inlet opening through which an intake air flow is introduced into the intake collector, and branch openings to which branch pipes are connected. The branch openings are arranged along a longitudinal direction of the intake collector such that as a distance thereof from the inlet opening decreases, an amount of offset thereof from a reference streamline of the intake air flow extending through substantially a center of the inlet opening along the longitudinal direction of the intake collector increases.

Abstract: An air intake structure of a multiple cylinder internal combustion engine. The air intake structure includes an intake air collector having first and second end sides which are longitudinally opposite to each other. An intake air inducting pipe is connected to the intake air collector. A plurality of branch pipes are connected to the intake air collector. Each branch pipe is connected through a junction section of the branch pipe to the intake air collector. The intake air inducting pipe has an opening section which is located between a first branch pipe located at the first end side of the intake air collector and a second branch pipe located adjacent to the first branch pipe in a longitudinal direction of the intake air collector. The opening section has an axis directed to a third branch pipe located at the second end side of the intake air collector.

Abstract: An air intake structure of a multiple cylinder internal combustion engine. The air intake structure includes an intake air collector having first and second end sides which are longitudinally opposite to each other. An intake air inducting pipe is connected to the intake air collector. A plurality of branch pipes are connected to the intake air collector. Each branch pipe is connected through a junction section of the branch pipe to the intake air collector. The intake air inducting pipe has an opening section which is located between a first branch pipe located at the first end side of the intake air collector and a second branch pipe located adjacent to the first branch pipe in a longitudinal direction of the intake air collector. The opening section has an axis directed to a third branch pipe located at the second end side of the intake air collector.

Abstract: An intake arrangement for an internal combustion engine, including an intake manifold including an intake collector and a plurality of branch pipes connected with the intake collector. The branch pipes extend in substantially same direction. The intake collector includes an inlet opening through which an intake air flow is introduced into the intake collector, and branch openings to which branch pipes are connected. The branch openings are arranged along a longitudinal direction of the intake collector such that as a distance thereof from the inlet opening decreases, an amount of offset thereof from a reference streamline of the intake air flow extending through substantially a center of the inlet opening along the longitudinal direction of the intake collector increases.

Abstract: Branch pipes (3) of an intake manifold (1) comprise main bodies (3c), a common flange (11b) and pipe shape joining portions (11c) respectively connecting the main bodies (3c) to the flange (11b). By injection molding, the common flange (11b), the joining portions (11c) and a portion of the main bodies (3c) are formed in one piece as a first component (11), and the remaining portion of the main bodies (3c) is formed in one piece as a second component (12). A notch that has a metal mold draft angle (11d) is formed on the inner circumference of joining portion (11c) and the flange (11b). Filling the notch by using an adjusting member (22) when attaching the intake manifold (1) to an engine through the flange (11b) compensates for changes in shape of a passage cross section caused by the draft angle. A constant passage cross section is thus maintained.

Abstract: An engine air intake manifold has two main body sections that are divided along an airflow direction and mated tightly against each other at oppositely facing mating parts so as to form an air intake passage therein. A gas passage is formed along the mating parts. The gas passage opens into a downstream portion of the air intake passage and supplies a secondary additive gas thereto. Preferably, the engine air intake manifold has air intake branch pipes with valve mounting blocks for mounting air intake control valves to a downstream portion of the air intake branch pipes.