PRINCIPLES OF NAVAL ENGINEERING 



OILSLINGER 



RADIAL COMPRESSOR BEARING 



BEARING RETAINER 



SLIPPER BEARING THRUST SLEEVE 



147.146 



Figure 23-12.— Slipper bearing. 



for balance errors to take place when the engine 

 is operating. 



One type of slipper bearing is shown in figure 

 23-12. In this type of bearing, the slipper con- 

 sists of four pivoted-shoe segments, similar to 

 the pivoted shoes used in Kingsbury bearings. 

 The segments are held together loosely by a 

 wire spring. 



Another type of slipper bearing is shown in 

 figure 23-13. In this type of bearing, the slipper 

 consists of six segments which are fastened in 

 place by dowel pins. This type of bearing is 

 sometimes called a fixed-pivot slipper bearing. 



Accessory Drives 



Because the turbine and the compressor are 

 on the same rotating shaft, a popular miscon- 

 ception is that the gas turbine engine has only 

 one moving part. This is not the case, however. 

 A gas turbine engine requires a starting device 

 (which is usually a moving part), some kind of 

 control mechanism, and power take-offs. 



The accessory drive section of the gas 

 turbine engine takes care of these various 

 accessory functions. The primary purpose of 

 the accessory drive section is to provide space 

 for the mounting of the accessories required 

 for the operation and control of the engine. 

 Secondary purposes include acting as an oil 

 reservoir and/or oil sump and providing for 



147.147 



Figure 23-13.— Slipper bearing 

 (fixed-pivot type). 



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