4989436 Alloy steel Forged Crankshaft in engine Cummins 6LT8.9

  Cummins 6LT8.9 Crankshaft 4989436 Alloy steel Forged

Description:

1. Supply both genuine parts and OEM parts with good price for  Cummins 6LT8.9 Crankshaft 4989436 Alloy steel Forged

2. Accept small order and MOQ 1PC

3.Short delivery time for 7 days after payment

Applications:

Competitive Advantage:

Large stock for it & delivery time will be 7 days after payment for  Cummins 4BT3.9 Crankshaft 3929036 Alloy steel Forged

Forging and casting

Crankshafts can be forged from a steel bar usually through roll forging or cast in ductile steel. Today more and 

more manufacturers tend to favor the use of forged crankshafts due to their lighter weight, more compact 

dimensions and better inherent damping. With forged crankshafts, vanadium microalloyed steels are mostly 

used as these steels can be air cooled after reaching high strengths without additional heat treatment, with 

exception to the surface hardening of the bearing surfaces. The low alloy content also makes the material 

cheaper than high alloy steels. Carbon steels are also used, but these require additional heat treatment to reach

 the desired properties. Iron crankshafts are today mostly found in cheaper production engines (such as those 

found in the Ford Focus diesel engines) where the loads are lower. Some engines also use cast iron crankshafts

 for low output versions while the more expensive high output version use forged steel.

The shaft is subjected to various forces but generally needs to be analysed in two positions. Firstly, failure may occur at the position of maximum bending; this may be at the centre of the crank or at either end. In such a condition the failure is due to bending and the pressure in the cylinder is maximal. Second, the crank may fail due to twisting, so the conrod needs to be checked for shear at the position of maximal twisting. The pressure at this position is the maximal pressure, but only a fraction of maximal pressure

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