Crankshaft | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-02

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Crankshaft


00:01:04 1 History
00:01:13 1.1 Crank mechanism
00:01:21 1.1.1 Han China
00:02:07 1.1.2 Roman Empire
00:03:18 1.1.3 Medieval Europe
00:05:23 1.2 Crankshaft
00:05:31 1.2.1 Medieval Near East
00:06:38 1.2.2 Renaissance Europe
00:07:56 1.2.3 Modern Europe
00:10:17 2 Internal combustion engines
00:11:21 2.1 Bearings
00:12:12 2.2 Piston stroke
00:13:10 2.3 Engine configuration
00:14:55 2.4 Engine balance
00:15:26 2.5 Flying arms
00:16:08 2.6 Rotary aircraft engines
00:16:27 2.7 Radial engines
00:17:03 3 Construction
00:17:24 3.1 Forging and casting
00:18:30 3.2 Machining
00:20:29 3.2.1 Cleaning and inspection
00:21:55 3.2.2 Stamp counterweight webbing
00:22:25 3.2.3 Undercutting and thermal spraying
00:23:05 3.2.4 Welding
00:23:37 3.2.5 Relieving stress and rechecking for straightness
00:24:03 3.2.6 Crankshaft grinding
00:25:04 3.2.7 Shot peening
00:25:18 3.2.8 Replacing counterweights and determining proper balance
00:26:13 3.2.9 Micro-polishing and testing Rockwell hardness
00:27:05 3.2.10 Final steps
00:27:32 3.3 Microfinishing
00:28:28 3.4 Fatigue strength
00:28:56 3.5 Hardening
00:30:06 3.6 Counterweights
00:30:34 4 Stress on crankshafts
00:31:16 5 Counter-rotating crankshafts



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SUMMARY
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A crankshaft is a shaft driven by a crank mechanism, consisting of a series of cranks and crankpins to which the connecting rods of an engine are attached. It is a mechanical part able to perform a conversion between reciprocating motion and rotational motion. In a reciprocating engine, it translates reciprocating motion of the piston into rotational motion, whereas in a reciprocating compressor, it converts the rotational motion into reciprocating motion. In order to do the conversion between two motions, the crankshaft has "crank throws" or "crankpins", additional bearing surfaces whose axis is offset from that of the crank, to which the "big ends" of the connecting rods from each cylinder attach.
It is typically connected to a flywheel to reduce the pulsation characteristic of the four-stroke cycle, and sometimes a torsional or vibrational damper at the opposite end, to reduce the torsional vibrations often caused along the length of the crankshaft by the cylinders farthest from the output end acting on the torsional elasticity of the metal.