Pronunciation: [kɹˈaŋkpɪn] (IPA) 
The correct spelling of the word "crankpin" is k-r-a-ng-k-p-i-n. According to IPA phonetic transcription, the "crank" part is pronounced as kræŋk, with a short "a" sound followed by a nasal "ng" sound. The "pin" part is pronounced as pɪn, with a short "i" sound. A crankpin is a cylindrical pin in the connecting rod of an engine that connects the piston to the crankshaft, allowing it to turn and power the engine.
A crankpin is a critical component in the construction of a reciprocating engine, such as an internal combustion engine or a steam engine. It refers to the pin or journal on which the connecting rod of the engine attaches to the crankshaft. The crankpin is placed at specific intervals along the crankshaft, and its function is to convert the reciprocating motion of the connecting rod into the rotational motion of the crankshaft.
Typically made of high-grade steel, the crankpin must be extremely durable and capable of withstanding high amounts of stress and load. It experiences intense pressure and friction during the engine's operation, as it connects the reciprocating piston to the rotating crankshaft. The cylinder pressures and combustion forces are transmitted through the connecting rod, putting the crankpin under constant strain.
The crankpin is usually lubricated to minimize friction and wear, which is crucial for the smooth functioning and longevity of the engine. It often has a bearing or a bushing incorporated into it to further ensure optimal performance. Moreover, the size and design of the crankpin depend on the specific engine's requirements, and manufacturers carefully engineer it based on factors such as engine load, torque, and speed.
Overall, the crankpin plays a pivotal role in the reciprocating engine, serving as a vital link connecting the reciprocating and rotary motions of the engine, and facilitating the conversion of linear force into rotational power.
The word "crankpin" is a compound word comprised of "crank" and "pin".
The term "crank" originated from the Middle English word "cranke", which referred to a bending or winding instrument. This word can be traced back to the Old Norse word "krankr", meaning sickly or weak. It gradually took on the sense of a mechanical device that converts rotary motion into reciprocating motion.
As for "pin", it stems from the Old English word "pinn", meaning a peg or nail. This term was derived from the Latin word "pinna", which means a point or peg.
When combined, "crank" and "pin" form "crankpin", which refers to the pivot point where the connecting rod is attached to the crankshaft in an engine.
