Crankcase.
The crankcase consists of two reinforced aluminum alloy castings with the accessory housing as an integral part, fastened together by means of thru bolts, studs and nuts. The mating surfaces are joined without use of gaskets and the main bearing bores are machined for use of precision type bearing inserts.
The crankcase is the foundation of the engine. it is around the crankcase that the engine is built. it has to support both itself and a variety of internal and external mechanisms .it performs a verity of functions. it:
1. Contains the bearings in which the crankshaft(and sometimes the camshaft) rotates
2. Provides an oil-tight enclosure for the lubricant
3. Provides mounting points to attach the engine to the airframe
4. Provides support for the attachment of the cylinders
5. Prevents misalignment to the crankshaft and its bearings
The crankcase may be of one or multi-piece construction, but generally crankcase can be divide into three groups:
1. In-line or vee-type crankcases.
2. Opposed engine crankcases.
3. Radial engine crankcases.
Accessory cases.
The section of an aeroengine that contains the devices to operate such accessories as fuel pump(s), hydraulic and air pumps, and generators. An accessory gearbox is driven by a driveshaft from a bevel bearing connected to a compressor shaft in some gas turbine engines
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