Multi piece turpocharger housing

Abstract

A turbocharger casing including a first casing part, wherein an oil line starts at a first opening on an outer side of the first casing part, runs through the first casing part and opens out at a second opening of a substantially hollow-cylindrical bearing receptacle of the first casing part. Such turbocharger casings of the prior art are produced in a complicated manner by a sand casting process and therefore give rise to high production costs. The teaching is to arrive, without functional losses, at a simple-to-produce and cost-effective turbocharger casing by the turbocharger casing having a second casing part attached to the first casing part and by both casing parts together forming a cooling water line provided for cooling the bearing receptacle. It is thus possible to arrive at a lightweight turbocharger casing by conventional machining production methods and joining technique, and this turbocharger casing can be produced cost-effectively.

Description

[0001]The invention concerns a turbocharger housing in which an oil duct starts at a first opening of an outer side of the first housing part, extends right through the first housing part to open at a second opening into a substantially hollow cylindrical bearing receptacle of the first housing part. The invention further concerns a turbocharger comprising such a housing.BACKGROUND[0002]Turbochargers are used for improving the performance of internal combustion engines in which the kinetic energy of the exhaust gas stream is extracted with help of a turbine and is used to press the fuel-air mixture into the internal combustion engine with help of a common shaft of the turbine and of a compressor. In this way, the fixed cubic capacity of the internal combustion engine can be filled with larger quantity of the mixture so that a higher lifting force and thus also a higher engine performance is achieved during combustion.[0003]In passenger vehicles, turbochargers or rather the shaft of ...

AI Technical Summary

Benefits of technology

The present invention provides a lighter turbocharger housing that is simple and economic to manufacture without compromising its functionality. The housing is made up of two parts connected through a joining method, such as welding or glueing, which ensures tightness and prevents leakage of cooling water during operation. The cooling water conduit formed by the connection between the two parts is pre-formed without the need for a complex and expensive casting method. The housing parts can be made through cold-formation of sheet metal or machining methods, resulting in a through-put of cooling water up to four times greater than conventional cast parts while keeping the outer dimensions unchanged.

Problems solved by technology

As a rule, the shaft of the turbocharger is mounted in the turbocharger housing through a sliding bearing, with the consequence that a large amount of friction energy is released in the form of heat exactly inside the bearing receptacle of the turbocharger housing.

An eventual failure of the cooling of the turbocharger housing creates a risk of damage to the sliding bearing and a premature ignition of the fuel-air mixture in the cold housing.

Turbocharger housings made out of cast metal do indeed manifest an excellent thermal conductivity but possess, on the other hand, a heavy weight and give rise to very high manufacturing costs precisely due to the very complex integration of the cooling water conduit which, however, is indispensable.

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