Air-cooled turbocharger with optional internal pressure relief valve

摘要

A cooling system for a turbocharger that has a cooling jacket in the bearing housing wherein air is bled from the area behind the compressor wheel and introduced into the cooling jacket, through which it circulates and then exits into the atmosphere. In addition, a pressure relief valve located behind the compressor wheel is set to open at a predetermined charge air pressure level to introduce additional cooling air into the cooling jacket and also acts to limit the maximum rotational speed of the turbocharger over the high-speed range of the engine on which the turbocharger is mounted. In an alternate embodiment of the invention, cooling air can be taken from the intake manifold system of a turbocharged engine downstream of an air-to-air aftercooler and ducted to the cooling jacket in the turbocharger bearing housing.

主权项

1. An air-cooled turbocharger for an internal combustion engine, comprising:
an exhaust-driven turbine for driving a rotatable shaft, a compressor, with a compressor wheel, driven by the rotatable shaft for generating a flow of compressed air for delivery to the cylinders of an internal combustion engine, a bearing housing enclosing a bearing carrier that carries the rotatable shaft, said bearing housing also forming a cooling jacket around the bearing carrier, said cooling jacket having an opening to ambient atmosphere having a non-return valve therein, and means for forming a conduit for a flow of compressed air from behind the compressor wheel into the cooling jacket of the bearing housing.