Rotary unit of supercharger for engine and balance adjustment method thereof

Patent metadata

Field	Value
Publication number	US-2016208682-A1
Application number	US-201615083782-A
Country	US
Kind code	A1
Filing date	Mar 29, 2016
Priority date	Nov 12, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

A rotary unit is rotatably accommodated within a supercharger casing of a supercharger for pressurizing an intake air of an engine. The rotary unit includes a supercharger rotary shaft, an impeller fixed to a tip end portion of the supercharger rotary shaft, a rotating component rotatable together with the supercharger rotary shaft independently of the impeller, and a nut member for pressing the impeller and the rotating component in a direction axially of the supercharger rotary shaft to thereby fix them to the supercharger rotary shaft. The nut member is formed with an adjustment portion for the rotational balance adjustment.

First claim

What is claimed is:

1 . A rotary unit provided in a supercharger and adapted to be rotatably accommodated within a casing of the supercharger to pressurize an intake air for an engine, which unit comprises:
a rotary shaft; an impeller fixed to a tip end portion of the rotary shaft; a rotating component rotatable together with the rotary shaft and being separate from the impeller; a fixing member to fix the impeller and the rotating component to the rotary shaft while pressing them in an axial direction of the rotary shaft; and an adjustment portion for rotational balance adjustment formed in either the rotating component or the fixing member; and a non-rotating component which does not rotate together with the rotary shaft, wherein the rotary unit is fixed to the casing through the non-rotating component.

2 . A supercharger which comprises:
the rotary unit for the supercharger as defined in claim 1 ; a planetary gear through which a power is inputted to the rotary unit; and a bearing for supporting the rotary shaft in the casing, wherein: the non-rotating component includes a bearing housing, which accommodates the bearing, and a stopper member to prevent an axial movement of the bearing housing; the bearing housing is supported in the casing for movement in a radial direction; and the stopper member is fixed to the casing.

3 . The supercharger as claimed in claim 2 , wherein the bearing housing is supported in the casing through an oil layer for movement in the radial direction, and
the stopper member comprises a seal holding body to hold an oil seal used to avoid an oil leakage from the oil layer.

4 . The supercharger as claimed in claim 2 , further comprising a shim to adjust a tip clearance delimited between the non-rotating component and the casing, the shim being inserted between the impeller and the casing.

5 . A balance adjusting method for a rotary shaft of a centrifugal flow supercharger to pressurize an intake air for an engine, which method is to adjust the balance of the rotary shaft of the supercharger prior to assemblage of the supercharger, the method comprising:
a rotary unit assembling step of mounting to the rotary shaft an impeller, to be fixed to a tip end portion of the rotary shaft, and a rotating component, which is separate from the impeller and capable of rotating integrally with the rotary shaft, and then axially pressing the impeller and the rotating component with the use of a fixing member to fix to the rotary shaft, thereby to assemble a rotary unit; a rotational balance adjusting step of adjusting the rotational balance of the rotary unit by forming an adjustment portion in the rotating component or the fixing member to allow an adjustment on the adjustment portion; and an assembling step of incorporating the rotary unit RU, after the rotational balance has been adjusted, in the supercharger casing without being dismantled.

6 . The balance adjusting method for the rotary shaft as claimed in claim 5 , wherein a bearing hosing is provided in the rotary unit to accommodate therein a bearing to support the rotary shaft, and
during the rotational balance adjusting step, the rotary unit is rotated, in a condition while fixedly supporting the bearing housing, to adjust the rotational balance of the rotary unit.

7 . An assembling method for the centrifugal supercharger including a rotary shaft, which has been adjusted by the balance adjusting method as claimed in claim 5 , and a non-rotating component that is provided in the rotary unit and does not rotate together with the rotary shaft,
wherein a shim is inserted in between the non-rotating component and the casing to adjust a tip clearance between the impeller and the casing.

Assignees

• Kawasaki Heavy Ind Ltd

Inventors

• Naruoka Shohei
• Arima Hisatoyo

Classifications

• F01D25/28

  Supporting or mounting arrangements, e.g. for turbine casing · CPC title

• F01D5/027

  Arrangements for balancing (for balancing rotating bodies in general F16F15/32; for compensating imbalance G01M1/36) · CPC title

• F02D23/005

  with the supercharger being mechanically driven by the engine (supercharger drives F02B39/00) · CPC title

• F02B39/04 Primary

  Mechanical drives; Variable-gear-ratio drives (non-mechanical pump drives having variable gear ratio F02B39/08) · CPC title

• F02B39/12

  Drives characterised by use of couplings or clutches therein (using fluid slip couplings for varying gear ratio F02B39/08) · CPC title