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A crankpin or crank pin, also known as a rod bearing journal, [1] is a mechanical device in an engine which connects the crankshaft to the connecting rod for each cylinder. It has a cylindrical surface, to allow the crankpin to rotate relative to the "big end" of the connecting rod. [2] [3] [4]
The crankshaft is a rotating shaft containing one or more crankpins, [1] that are driven by the pistons via the connecting rods. [2] The crankpins are also called rod bearing journals, and they rotate within the "big end" of the connecting rods. Most modern crankshafts are located in the engine block.
Top view section of the Cyclone Waste Heat Engine (WHE) six cylinder radial steam engine. A unique 'spider bearing' is used to connect all six connecting rods to the crankpin, rather than the traditional master connecting rod used in radial engines. Steam is exhausted through the piston tops into the crankcase.
In the semi-floating configuration, the pin is usually fixed relative to the piston by an interference fit with the journal in the piston. (This replaced the earlier set screw method. [3]) The connecting rod small end bearing thus acts as the bearing alone. In this configuration, only the small end bearing requires a bearing surface, if any.
Oil passages from the main bearings to the connecting rod bearings are drilled in each crankcheck so that each rod bearing is fed by two oil passages. The crankshaft is drilled so that excess oil from the main bearings is forced into the hollow journal and thence through tubes in the crankchecks to hollow crank pins."
A connecting rod, also called a 'con rod', [1] [2] [3] is the part of a piston engine which connects the piston to the crankshaft. Together with the crank, the connecting rod converts the reciprocating motion of the piston into the rotation of the crankshaft. [4] The connecting rod is required to transmit the compressive and tensile forces from ...
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The number of main bearings is primarily determined by the overall load factor and maximum engine speed. [1] Increasing the number of bearings in an engine will generally increase the size and cost of the engine, but also reduces bending stress and deflection caused by the distance from the crank pins to the nearest bearings.