2.  Converted into the rotating motion of the crankshaft to be connected to the linear energy of reciprocating piston engine parts

3.  Endure compressive strength, tensile, and bending  Need strength, stiffness and reducing weight  Used chrome-molybden steel, through the description of the above

4.  Raw material  Impression-die forging  Annealing  Rolling(Flat, Structural shape)  Machining  Heat treatment  Grinding

5.  Steel(Carbon 0.25~0.35%)  Chrome : 0.8~1.1%  Molybden : 0.15~0.25%  Manganese : 0.4~0.6%

7.  Flat rolling  Structural shape rolling

8.  Machining & Grinding Reduce surface roughness Increase accuracy  Heat treatment(Tempering) Quenching is increase strength but occur brittleness Tempering over 200˚C reduce brittleness