Abstract: An internal combustion engine intake device includes an intake collector and a first air induction pipe. The intake collector includes a first collector space and a second collector space. The first air induction pipe extends diagonally downward from an upstream side of the intake collector with respect to a horizontal direction of the vehicle. The first air induction pipe includes a first air induction space and a second air induction space. The intake collector and the first air induction pipe are configured and arranged such that a first boundary plane defined between the first collector space and the first air induction space is substantially perpendicular to a direction of an intake air flow from the first air induction space into the first collector space and the first boundary plane is substantially coplanar with a second boundary plane defined between the second collector space and the second air induction space.

Abstract: An internal combustion engine intake device is provided for an internal combustion engine such that intake device that can reduce the vibration of the throttle chamber of an internal combustion engine. The intake device has an intake air collector, a vacuum tank and a first air induction pipe. The vacuum tank is arranged closely adjacent to the intake air collector. The first air induction pipe extends upstream from the intake air collector in such a manner as to be closely adjacent to the vacuum tank. Preferably, the first air induction pipe is integral with the intake air collector and the vacuum tank.

Abstract: An internal combustion engine intake device is provided for an internal combustion engine such that intake device that can reduce the vibration of the throttle chamber of an internal combustion engine. The intake device has an intake air collector, a vacuum tank and a first air induction pipe. The vacuum tank is arranged closely adjacent to the intake air collector. The first air induction pipe extends upstream from the intake air collector in such a manner as to be closely adjacent to the vacuum tank. Preferably, the first air induction pipe is integral with the intake air collector and the vacuum tank.

Abstract: An internal combustion engine intake device includes an intake collector and a first air induction pipe. The intake collector includes a first collector space and a second collector space. The first air induction pipe extends diagonally downward from an upstream side of the intake collector with respect to a horizontal direction of the vehicle. The first air induction pipe includes a first air induction space and a second air induction space. The intake collector and the first air induction pipe are configured and arranged such that a first boundary plane defined between the first collector space and the first air induction space is substantially perpendicular to a direction of an intake air flow from the first air induction space into the first collector space and the first boundary plane is substantially coplanar with a second boundary plane defined between the second collector space and the second air induction space.

Abstract: An engine air intake device comprises a collector divided by a partition wall into first and second volume chambers, first and second upstream intake pipe portions, a plurality of first and second downstream branch pipes, and a first communication valve. The first and second upstream intake pipe portions are connected to an upstream side of the first and second volume chambers, respectively. The first and second downstream branch pipes extend from the first and second volume chambers, respectively, to respective intake ports of first and second banks of first and second cylinders, respectively. The first communication valve is mounted to the partition wall in a position that does not interfere with a path of a main flow of intake air inside the collector and configured and arranged to allow communication between the first volume chamber and the second volume chamber when the first communication valve is open.

Abstract: An engine air intake device comprises a collector divided by a partition wall into first and second volume chambers, first and second upstream intake pipe portions, a plurality of first and second downstream branch pipes, and a first communication valve. The first and second upstream intake pipe portions are connected to an upstream side of the first and second volume chambers, respectively. The first and second downstream branch pipes extend from the first and second volume chambers, respectively, to respective intake ports of first and second banks of first and second cylinders, respectively. The first communication valve is mounted to the partition wall in a position that does not interfere with a path of a main flow of intake air inside the collector and configured and arranged to allow communication between the first volume chamber and the second volume chamber when the first communication valve is open.

Abstract: A butterfly valve assembly includes a valve shaft supported by a bearing so as to rotate around its longitudinal axis and having a first end and a second end, an actuator connected to the first end of the valve shaft, and a valve-opening sensor connected to the second end of the valve shaft and having a return spring therein that applies a force to the valve shaft perpendicularly to its longitudinal axis. The return spring disposed in the valve-opening sensor continuously applies its resilient force to both ends of the valve shaft in one direction, so that the valve shaft can be restricted in its free movement within the bearing, therefore the rattling noise, due to the vibration of the valve shaft within the bearing, can be prevented.

Abstract: A butterfly valve assembly includes a valve shaft supported by a bearing so as to rotate around its longitudinal axis and having a first end and a second end, an actuator connected to the first end of the valve shaft, and a valve-opening sensor connected to the second end of the valve shaft and having a return spring therein that applies a force to the valve shaft perpendicularly to its longitudinal axis. The return spring disposed in the valve-opening sensor continuously applies its resilient force to both ends of the valve shaft in one direction, so that the valve shaft can be restricted in its free movement within the bearing, therefore the rattling noise, due to the vibration of the valve shaft within the bearing, can be prevented.