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Bimetallic compressor wheel and a method of manufacture thereof

A compressor and turbocharger technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as stiffness reduction, and achieve the effect of preventing flexure, easy processing, and low moment of inertia

Inactive Publication Date: 2013-06-05
艾克莫特公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum compressor wheels provide less stiffness to the shaft as the temperature of the compressor wheel increases

Method used

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  • Bimetallic compressor wheel and a method of manufacture thereof
  • Bimetallic compressor wheel and a method of manufacture thereof
  • Bimetallic compressor wheel and a method of manufacture thereof

Examples

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Embodiment Construction

[0021] Those of ordinary skill in the art will appreciate that various features of the various embodiments illustrated and described with reference to any one figure may be combined with features described in one or more other figures to form alternatives not explicitly described or illustrated. implementation. Combinations of features described provide representative implementations for typical applications. However various combinations and modifications of the features in accordance with the teachings of the invention may be desired for particular applications or practices. Those of ordinary skill in the art will recognize similar applications or practices whether explicitly described or illustrated.

[0022] exist figure 1 In , the internal components of a turbocharger 10 are shown including a shaft 12 with a compressor net pressed against a compressor wheel 14 . An oil slinger 15 and a washer 16 are included on the shaft. Bearings 17 are included on the shaft between t...

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Abstract

The performance and durability of compressor wheels coupled to turbocharger shafts are at odds with each other in that a higher rotational speed can be accommodated by an aluminum compressor wheel. But, aluminum has a low yield strength which causes the compressor wheel to expand outwardly at high rotational speeds such that the slip fit on the shaft no longer prevents wobble at high rotational speeds. To at least partially address this issue, the compressor wheel has two portions: an inner portion made of steel or titanium that has a relatively higher yield strength and a blade portion made of a lightweight, castable material. The inner portion is manufactured with grabbing features on its periphery, placed in a die, and the blade portion is cast over the grabbing features to yield a compressor wheel of two materials that provides sufficient shaft stiffening without high rotational inertia.

Description

technical field [0001] The present invention relates to turbochargers, and more particularly to compressor wheels for turbochargers. Background technique [0002] The compressor wheel is typically mounted to the turbocharger shaft via a precision slip fit. The clamping force exerted by the compressor nut on the shaft-mounted portion of the compressor wheel provides stiffness to the shaft to prevent flexing and rocking within the shaft at high rotational speeds. It is desirable to manufacture aluminum compressor wheels with a lower moment of inertia than steel or titanium. It is also desirable to manufacture wheels of aluminum in order to use high volume, low cost manufacturing techniques such as high pressure die casting. Aluminum suffers from a low yield strength compared to stronger alternative alloys, which allows radial growth of the compressor wheel due to high centrifugal stress. In addition, aluminum has a high coefficient of thermal expansion. As the temperature ...

Claims

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Application Information

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IPC IPC(8): F04D29/28F04D29/30F04D29/02B22D19/16
CPCF04D29/00F01D5/048F04D29/023B23P15/006F01D5/12F04D29/284F05D2300/171F05D2300/121F05D2300/501F05D2300/133Y10T29/49988Y10T29/4998
Inventor T·R·加勒德
Owner 艾克莫特公司
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