Читать книгу Turbo: Real World High-Performance Turbocharger Systems - Jay K Miller - Страница 33

The bearing housing is what supports the entire system and routes the oil to the bearings. Usually made of cast iron, the bearing housing can be air and oil cooled, or in many cases such as automotive use, it contains water jackets to allow for water-cooling.

The turbocharger bearing housing is typically iron and houses all the bearings, seals, and connects the turbine and compressor ends together. Shown is the compressor end where one side of the vaneless diffuser is formed by the bearing housing flange (1). Also note the thrust bearing pocket (2), and the bearing bore (3). The compressor cover fits down over the bearing housing step (4). (Courtesy Diesel Injection Service Company, Inc.)

Looking at the turbine end of the bearing housing, there is typically a heat shield that covers the bearing housing portion where the turbine end journal bearing and seal ring are located. (Courtesy Diesel Injection Service Company, Inc.)

The bearing housing also houses all of the other small parts critical to turbo operation, such as the gas sealing system and oil control mechanisms. It also contains design features that insulate heat from the turbine from migrating into the lube oil and cooking it after engine shut down.

When any turbo system is installed, it must be done such that the bearing housing oil drain center is within 20 degrees either side of vertical. Otherwise oil can build up and leak either into the engine or into the exhaust and cause a severe oil smoke problem.