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Turbocharger

A technology of turbochargers, turbines, applied in the direction of machines/engines, shafts and bearings, bearing elements, etc.

Active Publication Date: 2012-04-04
BORGWARNER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current state of the art, when using high thermal conductivity metallic materials, the increase in temperature is caused by the relatively low flow rate which creates an increased residence time of the fluid in the diffuser

Method used

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Examples

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Embodiment Construction

[0022] figure 1 A schematically highly simplified illustration of a turbocharger 1 comprising a compressor 2 and a turbine 3 is shown. It is self-evident that this turbocharger 1 has all other conventional components, which however are not necessary for explaining the principle according to the invention and which have been correspondingly omitted.

[0023] figure 2 An enlarged sectional view of a bearing housing 4 of the turbocharger 1 is shown, which is arranged between the turbine 2 and the compressor 3 and which has a bearing housing cover 5 . The bearing housing cover 5 consists of a material with a low thermal conductivity, for example a heat-resistant plastic with a thermal conductivity of less than 5 W / mK. As can be seen from said figure, the bearing housing cover 5 has been enlarged to such an extent that it can also cover the diffuser wall of the compressor 2 (in figure 2 area not shown in ).

[0024] In order to obtain a further reduction of the heat flow from...

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PUM

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Abstract

The invention relates to a turbocharger (1) in which the bearing-housing-side diffuser wall is thermally decoupled in order to reduce the heat introduction at the bearing housing cover (5). The turbocharger (1) comprises a turbine (2), a compressor (3) which has a diffuser, and a bearing housing (4) which is arranged between the turbine (2) and the compressor (3) and which has the bearing housing cover (5). Said bearing housing cover (5) is composed of a material with a low thermal conductivity of at most 5 W / mK, for example a temperature-resistant plastic.

Description

technical field [0001] The invention relates to a turbocharger according to the preamble of claim 1 . Background technique [0002] A generic turbocharger is known from EP1256703B1. [0003] Turbochargers of said type are used in internal combustion engines in order to increase engine characteristic values ​​such as power and torque and to reduce exhaust emissions and, in particular, fuel consumption. At low peripheral speeds of the compressor wheel, a temperature increase of the compressor flow occurs at the housing wall on the bearing housing side of the diffuser. Since the bearing housing forms the connecting element between the turbine and the compressor, considerable internal heat transfer occurs from the turbine side to the compressor side. In the current state of the art, when using high thermal conductivity metallic materials, the increase in temperature is caused by the relatively low flow rate which creates an increased residence time of the fluid in the diffuser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B39/00F16C35/04F01D25/16F01D25/24
CPCF05D2220/40F05B2220/40F01D25/162F05C2251/048F05D2300/5024F01D25/16F01D25/24F02B39/00F16C35/04
Inventor T·利斯切尔
Owner BORGWARNER INC