INTERNAL-COMBUSTION-ENGINE SUPERCHARGER

摘要

An internal-combustion-engine supercharger includes a centrifugal compressor, a pre-compression flow path, a post-compression flow path, a bypass passage, and a control valve. The centrifugal compressor is disposed in an intake passage of an internal combustion engine and has an impeller to compress and discharge intake air using a radial centrifugal force generated by rotating the impeller. The intake air in the post-compression flow path is to be recirculated to the pre-compression flow path via the bypass passage. A connecting portion between the bypass passage and the pre-compression flow path is disposed at a position other than an extreme-bottom surface portion located at a lowest portion in a flow path section of the pre-compression flow path in a state where the internal-combustion-engine supercharger is installed in a vehicle. The control valve is disposed in the bypass passage to control a recirculation flow rate of the intake air.

主权项

1. An internal-combustion-engine supercharger comprising:
a centrifugal compressor that is disposed in an intake passage of an internal combustion engine and compresses and discharges intake air flowing therein with a radial centrifugal force generated by rotation of an impeller; a pre-compression flow path through which the intake air to enter the impeller flows; a post-compression flow path that is disposed below the pre-compression flow path in a state installed in a vehicle and through which the intake air that is compressed by and discharged from the impeller flows; a bypass passage for recirculating the intake air in the post-compression flow path to the pre-compression flow path; and a control valve that is disposed at an intermediate point of the bypass passage and controls the recirculation flow rate of the intake air, wherein a connecting portion between the bypass passage and the pre-compression flow path is disposed at a position other than an extreme-bottom surface portion of a flow path section of the pre-compression flow path in a state installed in the vehicle.