Lumped-Mass Dynamic Model  The connecting rod in complex motion can be modeled as two lumped point masses, one on the crankpin
(in pure rotation) and the other on the wrist pin (in pure translation).
2: Hardness measured by diamond Indenter of crankpin
on surface and cross sectional area [Fatigue failure with brittle fracture shown as A and B while C indicated as beach marks]
R: Ratio between length of connecting rod and crankpin
Fessler, "The design of overlapped crankshafts Part 1: crankpin
fillets," Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, vol.
1, both of the value and direction of the load applied to the crankshaft vary with time, so the center of the crankpin
has periodic motion relative to the connecting rod bearing center.
Regular repairs of marine diesel engine crankshaft main and crankpin
journals surfaces are therefore needed in order to perform partial or complete renovation of the worn crankshaft journals.
To calculate the frictional forces acting on surfaces between the vane and piston, between the piston and crankpin
, and of main bearing, Coulomb's friction law is applied.
The cranks are manufactured in the mould, having shape of the cheek with a water-cooled niche in the place of a future crankpin
. First billet of the cheek with a crankpin
in the form of a boss is melted (Figure 1, a).
They have incorporated the latest generation of highly flexible, accurate, and productive CNC orbital crankpin
grinders with CBN abrasives, whereas the use of older style indexing-type crankpin
grinders with conventional grinding wheels is still very prevalent in the global diesel engine industry.
For years, most diesel engine crankshaft manufacturers have found crankshaft lines made up of traditional style indexing-type crankpin
grinders with conventional grinding wheels to be a cost-effective solution to their manufacturing requirements.
Landis Gardner (Waynesboro, Pa.) has developed its Crank Center grinder that uses a single, narrow CBN wheel to make multiple orbital-grinding passes and a final wiping of each eccentric-diameter crankpin
. The single machine does the work of four.
(They take each element so seriously that they have applied to register the unique sound of their V-twin, common crankpin