This impeller is provided with: an impeller body formed in a disk-like shape and having a boss hole section formed therein, the boss hole section allowing a rotating shaft to be fitted therein; and compressor blades provided on the front surface side of the impeller body so as to protrude from the hub surface of the impeller body. The impeller consists either of a first resin member and a second resin member, which are engaged with each other and which consist of a resin, or of a resin member and a metallic member, which are engaged with each other.

This impeller is equipped with: an impeller body formed from a resin and shaped as a disk with an axis as the center thereof, and having a boss hole section formed therein which a rotating shaft for rotating around the axis engages; compressor blades provided on the front-surface side of the impeller body; and a ring-shaped reinforcing ring provided inside the impeller body in the circumferential direction of the impeller body.

An air intake device includes a bypass passage which makes a portion of an air intake passage on an upstream side of a compressor and a portion of the air intake passage on a downstream side of the compressor communicate with each other, and a bypass passage open/close valve which opens or closes the bypass passage. The air intake passage includes a first passage extending toward an upstream side from the compressor along a first direction, a bent portion bent from an upstream end of the first passage in a second direction, and a second passage extending from an upstream end of the bent portion along the second direction. The second passage has a vertically elongated cross-sectional shape. A vibration suppressing part for suppressing vibrations of the second passage is disposed in at least one of the second passage and the bent portion.

Methods and systems are provided for a noise mitigating device for a turbocharger compressor. In one example, the noise mitigating device includes a set of perforated rings arranged in a recirculation passage of a compressor casing treatment. The rings of the set of perforated rings may be oriented so that apertures of one ring are offset from apertures of one or more adjacent rings, forcing air to flow through the apertures via a non-linear path while deflecting at least a portion of sounds waves generated in the compressor.

This impeller is provided with: an impeller body formed in a disk-like shape and having a boss hole section formed therein, the boss hole section allowing a rotating shaft to be fitted therein; and compressor blades provided on the front surface side of the impeller body so as to protrude from the hub surface of the impeller body. The impeller consists either of a first resin member and a second resin member, which are engaged with each other and which consist of a resin, or of a resin member and a metallic member, which are engaged with each other.

This impeller is equipped with: an impeller body formed from a resin and shaped as a disk with an axis as the center thereof, and having a boss hole section formed therein which a rotating shaft for rotating around the axis engages; compressor blades provided on the front-surface side of the impeller body; and a ring-shaped reinforcing ring provided inside the impeller body in the circumferential direction of the impeller body.

Methods and systems are provided for a noise mitigating device for a turbocharger compressor. In one example, the noise mitigating device includes a set of perforated rings arranged in a recirculation passage of a compressor casing treatment. The rings of the set of perforated rings may be oriented so that apertures of one ring are offset from apertures of one or more adjacent rings, forcing air to flow through the apertures via a non-linear path while deflecting at least a portion of sounds waves generated in the compressor.

An air intake device includes a bypass passage which makes a portion of an air intake passage on an upstream side of a compressor and a portion of the air intake passage on a downstream side of the compressor communicate with each other, and a bypass passage open/close valve which opens or closes the bypass passage. The air intake passage includes a first passage extending toward an upstream side from the compressor along a first direction, a bent portion bent from an upstream end of the first passage in a second direction, and a second passage extending from an upstream end of the bent portion along the second direction. The second passage has a vertically elongated cross-sectional shape. A vibration suppressing part for suppressing vibrations of the second passage is disposed in at least one of the second passage and the bent portion.

The object is to provide a compressor housing which can suppress blowback of oil. A compressor housing (1) is used in a compressor which uses a compressor impeller (5) provided in an intake air flow path more to a downstream side than a blow-by gas inlet. The compressor housing (1) includes an impeller chamber (2), and an intake air duct (6) which extends along an axis line (C). The duct (6) includes an inner-wall face (61). A step part (67) that is arc shaped along a circumferential direction of the impeller (5) and has a distance along the radial direction of the impeller (5) from the axis line (C) that is farther at a downstream side than at an upstream side thereof is formed in the inner-wall face (61) more to an upstream side along the axis line (C) than the intake air inlet (22).

The object is to provide a compressor housing which can suppress blowback of oil. A compressor housing (1) is used in a compressor which uses a compressor impeller (5) provided in an intake air flow path more to a downstream side than a blow-by gas inlet. The compressor housing (1) includes an impeller chamber (2), and an intake air duct (6) which extends along an axis line (C). The duct (6) includes an inner-wall face (61). A step part (67) that is arc shaped along a circumferential direction of the impeller (5) and has a distance along the radial direction of the impeller (5) from the axis line (C) that is farther at a downstream side than at an upstream side thereof is formed in the inner-wall face (61) more to an upstream side along the axis line (C) than the intake air inlet (22).