Crankshaft

Last updated
Crankshaft (red), pistons (gray), cylinders (blue) and flywheel (black) Cshaft.gif
Crankshaft (red), pistons (gray), cylinders (blue) and flywheel (black)

A crankshaft is a mechanical component used in a piston engine to convert the reciprocating motion into rotational motion. The crankshaft is a rotating shaft containing one or more crankpins, [1] that are driven by the pistons via the connecting rods. [2]

Contents

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. They are made from steel or cast iron, using either a forging, casting or machining process.

Design

Crankshaft, pistons and connecting rods for a typical internal combustion engine Cad crank.jpg
Crankshaft, pistons and connecting rods for a typical internal combustion engine
Marine engine crankshafts from 1942 Marine Crankshafts 8b03602r.jpg
Marine engine crankshafts from 1942

The crankshaft is located within the engine block and held in place via main bearings which allow the crankshaft to rotate within the block. [3] The up-down motion of each piston is transferred to the crankshaft via connecting rods. [4] A flywheel is often attached to one end of the crankshaft, in order to smoothen the power delivery and reduce vibration. [5]

A crankshaft is subjected to enormous stresses, in some cases more than 8.6 tonnes (19,000 pounds) per cylinder. [6] Crankshafts for single-cylinder engines are usually a simpler design than for engines with multiple cylinders.

Bearings

The crankshaft is able to rotate in the engine block due to the 'main bearings'. Since the crankshaft is subject to large horizontal and torsional forces from each cylinder, these main bearings are located at various points along the crankshaft, rather than just one at each end. [7] The number of main bearings is determined based on the overall load factor and the maximum engine speed. Crankshafts in diesel engines often use a main bearing between every cylinder and at both ends of the crankshaft, due to the high forces of combustion present. [8]

Flexing of the crankshaft was a factor in V8 engines replacing straight-eight engines in the 1950s; the long crankshafts of the latter suffered from an unacceptable amount of flex when engine designers began using higher compression ratios and higher engine speeds (RPM). [9]

Piston stroke

The distance between the axis of the crankpins and the axis of the crankshaft determines the stroke length of the engine. [1]

Most modern car engines are classified as "over square" or short-stroke,[ citation needed ] wherein the stroke is less than the diameter of the cylinder bore. A common way to increase the low-RPM torque of an engine is to increase the stroke, sometimes known as "stroking" the engine. Historically, the trade-off for a long-stroke engine was a lower rev limit and increased vibration at high RPM, due to the increased piston velocity. [10]

Cross-plane and flat-plane configurations

When designing an engine, the crankshaft configuration is closely related to the engine's firing order. [11] [12]

Most production V8 engines (such as the Ford Modular engine and the General Motors LS engine) use a cross-plane crank whereby the crank throws are spaced 90 degrees apart. [13] However, some high-performance V8 engines (such as the Ferrari 488) [14] [15] instead use a flat-plane crank, whereby the throws are spaced 180° apart, which essentially results in two inline-four engines sharing a common crankcase. Flat-plane engines are usually able to operate at higher RPM, however they have higher second-order vibrations, [16] so they are better suited to racing car engines. [17]

Engine balance

For some engines it is necessary to provide counterweights for the reciprocating mass of the piston, conrods and crankshaft, in order to improve the engine balance. [18] [19] These counterweights are typically cast as part of the crankshaft but, occasionally, are bolt-on pieces.[ citation needed ]

Flying arms

Flying arm (the boomerang-shaped link between first and second crankpins on a crankshaft) Crankshaft jap grayscale.jpg
Flying arm (the boomerang-shaped link between first and second crankpins on a crankshaft)

In some engines, the crankshaft contains direct links between adjacent crankpins, without the usual intermediate main bearing. These links are called flying arms. [20] : 16, 41  This arrangement is sometimes used in V6 and V8 engines, in order to maintain an even firing interval while using different V angles, and to reduce the number of main bearings required. The downside of flying arms is that the rigidity of the crankshaft is reduced, which can cause problems at high RPM or high power outputs. [21]

Counter-rotating crankshafts

In most engines, each connecting rod is attached a single crankshaft, which results in the angle of the connecting rod varying as the piston moves through its stroke. This variation in angle pushes the pistons against the cylinder wall, which causes friction between the piston and cylinder wall. [22] To prevent this, some early engines – such as the 1900–1904 Lanchester Engine Company flat-twin engines – connected each piston to two crankshafts that are rotating in opposite directions. This arrangement cancels out the lateral forces and reduces the requirement for counterweights. This design is rarely used, however a similar principle applies to balance shafts, which are occasionally used.

Construction

Forged crankshafts

Forged crankshaft IPH Kurbelwelle.jpg
Forged crankshaft

Crankshafts can be created from a steel bar using roll forging. Today, manufacturers tend to favour the use of forged crankshafts due to their lighter weight, more compact dimensions and better inherent damping. [23] With forged crankshafts, vanadium micro-alloyed steels are mainly used as these steels can be air-cooled after reaching high strengths without additional heat treatment, except for the surface hardening of the bearing surfaces. The low alloy content also makes the material cheaper than high-alloy steels. Carbon steels also require additional heat treatment to reach the desired properties.

Cast crankshafts

Another construction method is to cast the crankshaft from ductile iron. Cast iron crankshafts are today mostly found in cheaper production engines where the loads are lower.

Machined crankshafts

Crankshafts can also be machined from billet, often a bar of high quality vacuum remelted steel. Though the fiber flow (local inhomogeneities of the material's chemical composition generated during casting) does not follow the shape of the crankshaft (which is undesirable), this is usually not a problem since higher quality steels, which normally are difficult to forge, can be used. Per unit, these crankshafts tend to be expensive due to the large amount of material that must be removed with lathes and milling machines, the high material cost, and the additional heat treatment required. However, since no expensive tooling is needed, this production method allows small production runs without high up-front costs.

History

Crank

Asia

Querns are a form of hand-operated crank. Bundesarchiv Bild 135-BB-152-11, Tibetexpedition, Tibeter mit Handmuhle.jpg
Querns are a form of hand-operated crank.

The earliest hand-operated cranks appeared in China during the Han dynasty (202 BC – 220 AD). They were used for silk-reeling, hemp-spinning, for the agricultural winnowing fan, in the water-powered flour-sifter, for hydraulic-powered metallurgic bellows, and in the well windlass. [26] Pottery models with crank operated winnowing fans were unearthed dating back to the Western Han dynasty (202 BC - 9 AD). [27] [26] The rotary winnowing fan greatly increased the efficiency of separating grain from husks and stalks. [28] [29] The Chinese used the crank-and-connecting rod in ancient blasting apparatus, textile machinery and agricultural machinery no later than the Western Han dynasty (202 BC – 9 AD). Eventually crank-and-connecting rods were used in the inter-conversion or rotary and reciprocating motion for other applications such as flour-sifting, treadle spinning wheels, water-powered furnace bellows, and silk-reeling machines. [30] [26]

Middle East

Ancient Egyptians had manual drills resembling a crank at the time of the Old Kingdom (2686–2181 BCE) and even a hieroglyph for the tool. [31] However the Ancient Egyptian drill did not operate as a true crank. [32]

Later evidence for the crank, combined with a connecting rod in a machine, appears in the Ancient Greek Hierapolis sawmill in Roman Asia from the 3rd century AD and two stone sawmills at Gerasa, Roman Syria, and Ephesus, Greek Ionia under Rome, (both 6th century AD). [33] On the pediment of the Hierapolis mill, a waterwheel fed by a mill race is shown powering via a gear train two frame saws which cut rectangular blocks by the way of some kind of connecting rods and, through mechanical necessity, cranks. The accompanying inscription is in Greek. [34] The crank and connecting rod mechanisms of the other two archaeologically attested sawmills worked without a gear train. [35] [36]

The crank appears in the mid-9th century in several of the hydraulic devices described by the Banū Mūsā brothers in their Book of Ingenious Devices . [37] These devices, however, made only partial rotations and could not transmit much power, [38] although only a small modification would have been required to convert it to a crankshaft. [39]

Al-Jazari (1136–1206) described a crank and connecting rod system in a rotating machine in two of his water-raising machines. [40] His twin-cylinder pump incorporated a crankshaft. [41] A crank is later also described in an early 15th century Arabic manuscript of Hero of Alexandria's Mechanics. [42]

Europe and Roman Empire

Hierapolis sawmill in Asia Minor (3rd century), a machine that combines a crank with a connecting rod. Romische Sagemuhle.svg
Hierapolis sawmill in Asia Minor (3rd century), a machine that combines a crank with a connecting rod.

The first rotary hand mills, or rotary querns, appeared in Spain (600 BC – 500 BC), [44] [45] before they spread to the East. [44] [45] The handle near the outer edge of the rotary part being the crank [44] [25] [46] and human arm powering the rotation would be the connecting rod. [44] However according to F. Lisheng and T. Qingjun, the hand-crank of the rotary quern was different from a crank, which was the combination of a hand-crank and a push-and-pull connecting rod by a hinge. [47]

The Antikythera mechanism, dated to around 200 BC, [48] [49] used a crank as a part of its mechanism. [50] The crank was used to manually introduce dates. [51]

Evidence for the crank combined with a connecting rod, appears in the Ancient Greek Hierapolis mill, dating to the 3rd century AD under the Roman Empire; they are also found in stone sawmills in Roman Syria and Ephesus, Greek Ionia under Rome, dating to the 6th century. [43] The pediment of the Hierapolis mill shows a waterwheel fed by a mill race powering via a gear train two frame saws which cut blocks by the way of some kind of connecting rods and cranks. [34] The crank and connecting rod mechanisms of the other two archaeologically attested sawmills worked without a gear train. [35] [52]

Roman crank handle, c. 250 AD Roman crank handle, Augusta Raurica, Switzerland. Pic 01.jpg
Roman crank handle, c. 250 AD

A Roman iron crank dating to the 2nd century AD was excavated in Augusta Raurica, Switzerland. [53] [54] The crank-operated Roman mill is dated to the late 2nd century. [55]

Water-powered marble saws in Germany were mentioned by the late 4th century poet Ausonius; [43] about the same time, these mill types seem also to be indicated by Greek Saint Gregory of Nyssa from Anatolia. [56] [43] [57]

A rotary grindstone [58] operated by a crank handle is shown in the Carolingian manuscript Utrecht Psalter ; the pen drawing of around 830 goes back to a late antique original. [59] Cranks used to turn wheels are also depicted or described in various works dating from the tenth to thirteenth centuries. [58] [60]

The first depictions of the compound crank in the carpenter's brace appear between 1420 and 1430 in northern European artwork. [61] The rapid adoption of the compound crank can be traced in the works of an unknown German engineer writing on the state of military technology during the Hussite Wars: first, the connecting-rod, applied to cranks, reappeared; second, double-compound cranks also began to be equipped with connecting-rods; and third, the flywheel was employed for these cranks to get them over the 'dead-spot'. [62] The concept was much improved by the Italian engineer and writer Roberto Valturio in 1463, who devised a boat with five sets, where the parallel cranks are all joined to a single power source by one connecting-rod, an idea also taken up by his compatriot Italian painter Francesco di Giorgio. [63]

The crank had become common in Europe by the early 15th century, as seen in the works of the military engineer Konrad Kyeser (1366–after 1405). [64] [65] Devices depicted in Kyeser's Bellifortis include cranked windlasses for spanning siege crossbows, cranked chain of buckets for water-lifting and cranks fitted to a wheel of bells. [65] Kyeser also equipped the Archimedes' screws for water-raising with a crank handle, an innovation which subsequently replaced the ancient practice of working the pipe by treading. [66]

Pisanello painted a piston-pump driven by a water-wheel and operated by two simple cranks and two connecting-rods. [62] The 15th century also saw the introduction of cranked rack-and-pinion devices, called cranequins, which were fitted to the crossbow's stock as a means of exerting even more force while spanning the missile weapon. [67] In the textile industry, cranked reels for winding skeins of yarn were introduced. [65]

The Luttrell Psalter , dating to around 1340, describes a grindstone which was rotated by two cranks, one at each end of its axle; the geared hand-mill, operated either with one or two cranks, appeared later in the 15th century. [65] Around 1480, the early medieval rotary grindstone was improved with a treadle and crank mechanism. Cranks mounted on push-carts first appear in a German engraving of 1589. [68]

Crankshaft

In 9th century Abbasid Baghdad, automatically operated cranks appear in several of the hydraulic devices described by the Banū Mūsā brothers in the Book of Ingenious Devices . [37] These automatically operated cranks appear in several devices, two of which contain an action which approximates to that of a crankshaft, five centuries before the earliest known European description of a crankshaft. However, the automatic crank mechanism described by the Banū Mūsā would not have allowed a full rotation, but only a small modification was required to convert it to a crankshaft. [39]

In the Artuqid Sultanate, Arab engineer Ismail al-Jazari (1136–1206) described a crank and connecting rod system in a rotating machine for two of his water-raising machines, [40] which include both crank and shaft mechanisms. [69]

15th century paddle-wheel boat Anonymous of the Hussite Wars. Clm 197, Part 1, Folio 17v Supra.jpg
15th century paddle-wheel boat

The Italian physician Guido da Vigevano (c. 1280 – c. 1349), planning for a new Crusade, made illustrations for a paddle boat and war carriages that were propelled by manually turned compound cranks and gear wheels, [70] identified as an early crankshaft prototype by Lynn Townsend White. [71]

1661 water pump by Georg Andreas Bockler Fotothek df tg 0006690 Mechanik ^ Wasserforderung ^ Pumpe.jpg
1661 water pump by Georg Andreas Böckler

Crankshafts were described by Leonardo da Vinci (1452–1519) [40] and a Dutch farmer and windmill owner by the name Cornelis Corneliszoon van Uitgeest in 1592. His wind-powered sawmill used a crankshaft to convert a windmill's circular motion into a back-and-forward motion powering the saw. Corneliszoon was granted a patent for his crankshaft in 1597.

From the 16th century onwards, evidence of cranks and connecting rods integrated into machine design becomes abundant in the technological treatises of the period: Agostino Ramelli's The Diverse and Artifactitious Machines of 1588 depicts eighteen examples, a number that rises in the Theatrum Machinarum Novum by Georg Andreas Böckler to 45 different machines. [72] Cranks were formerly common on some machines in the early 20th century; for example almost all phonographs before the 1930s were powered by clockwork motors wound with cranks. Reciprocating piston engines use cranks to convert the linear piston motion into rotational motion. Internal combustion engines of early 20th century automobiles were usually started with hand cranks, before electric starters came into general use.

See also

Related Research Articles

<span class="mw-page-title-main">Watermill</span> Structure that uses a water wheel or turbine

A watermill or water mill is a mill that uses hydropower. It is a structure that uses a water wheel or water turbine to drive a mechanical process such as milling (grinding), rolling, or hammering. Such processes are needed in the production of many material goods, including flour, lumber, paper, textiles, and many metal products. These watermills may comprise gristmills, sawmills, paper mills, textile mills, hammermills, trip hammering mills, rolling mills, and wire drawing mills.

<span class="mw-page-title-main">Crosshead</span> Sliding pin joint in a slider-crank linkage, commonly used in engine pistons

In mechanical engineering, a crosshead is a mechanical joint used as part of the slider-crank linkages of long reciprocating engines and reciprocating compressors to eliminate sideways force on the piston. Also, the crosshead enables the connecting rod to freely move outside the cylinder. Because of the very small bore-to-stroke ratio on such engines, the connecting rod would hit the cylinder walls and block the engine from rotating if the piston was attached directly to the connecting rod like on trunk engines. Therefore, the longitudinal dimension of the crosshead must be matched to the stroke of the engine.

<span class="mw-page-title-main">Ismail al-Jazari</span> Muslim engineer and artist (1136–1206)

Badīʿ az-Zaman Abu l-ʿIzz ibn Ismāʿīl ibn ar-Razāz al-Jazarī was a Muslim polymath: a scholar, inventor, mechanical engineer, artisan and artist from the Artuqid Dynasty of Jazira in Mesopotamia. He is best known for writing The Book of Knowledge of Ingenious Mechanical Devices in 1206, where he described 50 mechanical devices, along with instructions on how to construct them. One of his more famous inventions is the elephant clock. He has been described as the "father of robotics" and modern day engineering.

<span class="mw-page-title-main">Sawmill</span> Facility where logs are cut into lumber

A sawmill or lumber mill is a facility where logs are cut into lumber. Modern sawmills use a motorized saw to cut logs lengthwise to make long pieces, and crosswise to length depending on standard or custom sizes. The "portable" sawmill is simple to operate. The log lies flat on a steel bed, and the motorized saw cuts the log horizontally along the length of the bed, by the operator manually pushing the saw. The most basic kind of sawmill consists of a chainsaw and a customized jig, with similar horizontal operation.

<span class="mw-page-title-main">Crank (mechanism)</span> Simple machine transferring motion to or from a rotating shaft at a distance from the centreline

A crank is an arm attached at a right angle to a rotating shaft by which circular motion is imparted to or received from the shaft. When combined with a connecting rod, it can be used to convert circular motion into reciprocating motion, or vice versa. The arm may be a bent portion of the shaft, or a separate arm or disk attached to it. Attached to the end of the crank by a pivot is a rod, usually called a connecting rod (conrod).

<span class="mw-page-title-main">Connecting rod</span> Piston engine component which connects the piston to the crankshaft

A connecting rod, also called a 'con rod', 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. The connecting rod is required to transmit the compressive and tensile forces from the piston. In its most common form, in an internal combustion engine, it allows pivoting on the piston end and rotation on the shaft end.

Engine balance refers to how the inertial forces produced by moving parts in an internal combustion engine or steam engine are neutralised with counterweights and balance shafts, to prevent unpleasant and potentially damaging vibration. The strongest inertial forces occur at crankshaft speed and balance is mandatory, while forces at twice crankshaft speed can become significant in some cases.

<span class="mw-page-title-main">Reciprocating motion</span> Repetitive back-and-forth linear motion

Reciprocating motion, also called reciprocation, is a repetitive up-and-down or back-and-forth linear motion. It is found in a wide range of mechanisms, including reciprocating engines and pumps. The two opposite motions that comprise a single reciprocation cycle are called strokes.

<span class="mw-page-title-main">Beam engine</span> Early configuration of the steam engine utilising a rocking beam to connect major components.

A beam engine is a type of steam engine where a pivoted overhead beam is used to apply the force from a vertical piston to a vertical connecting rod. This configuration, with the engine directly driving a pump, was first used by Thomas Newcomen around 1705 to remove water from mines in Cornwall. The efficiency of the engines was improved by engineers including James Watt, who added a separate condenser; Jonathan Hornblower and Arthur Woolf, who compounded the cylinders; and William McNaught, who devised a method of compounding an existing engine. Beam engines were first used to pump water out of mines or into canals but could be used to pump water to supplement the flow for a waterwheel powering a mill.

<span class="mw-page-title-main">Crankpin</span> Crankshaft section where connecting rods are attached

A crankpin or crank pin, also known as a rod bearing journal, 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.

<span class="mw-page-title-main">Ancient Roman engineering</span> Engineering accomplishments of the ancient Roman civilization

The ancient Romans were famous for their advanced engineering accomplishments. Technology for bringing running water into cities was developed in the east, but transformed by the Romans into a technology inconceivable in Greece. The architecture used in Rome was strongly influenced by Greek and Etruscan sources.

<span class="mw-page-title-main">Dead centre (engineering)</span> The positions of an engines piston at the top or bottom of its stroke

In a reciprocating engine, the dead centre is the position of a piston in which it is either farthest from, or nearest to, the crankshaft. The former is known as top dead centre (TDC) while the latter is known as bottom dead centre (BDC).

<span class="mw-page-title-main">Renaissance technology</span> Technology during the Renaissance era

Renaissance technology was the set of European artifacts and inventions which spread through the Renaissance period, roughly the 14th century through the 16th century. The era is marked by profound technical advancements such as the printing press, linear perspective in drawing, patent law, double shell domes and bastion fortresses. Sketchbooks from artisans of the period give a deep insight into the mechanical technology then known and applied.

<span class="mw-page-title-main">Marine steam engine</span> Steam engine that is used to power a ship or boat

A marine steam engine is a steam engine that is used to power a ship or boat. This article deals mainly with marine steam engines of the reciprocating type, which were in use from the inception of the steamboat in the early 19th century to their last years of large-scale manufacture during World War II. Reciprocating steam engines were progressively replaced in marine applications during the 20th century by steam turbines and marine diesel engines.

<span class="mw-page-title-main">Musgrave non-dead-centre engine</span>

Musgrave's non-dead-centre engine was a stationary steam engine of unusual design, intended to solve the problem of stopping on dead centre. It was designed in 1887 to serve as a marine engine. It used a pair of linked cylinders to prevent the engine from stopping in a position where no turning force can be applied. At least one engine is known to survive.

<span class="mw-page-title-main">Hierapolis sawmill</span> Roman water-powered stone sawmill

The Hierapolis sawmill was a water-powered stone sawmill in the Ancient Greek city of Hierapolis in Roman Asia. Dating to the second half of the 3rd century AD, the sawmill is considered the earliest known machine to combine a crank with a connecting rod to form a crank-slider mechanism.

<span class="mw-page-title-main">Return connecting rod engine</span>

A return connecting rod, return piston rod or double piston rod engine or back-acting engine is a particular layout for a steam engine.

The Michel engine was an unusual form of opposed-piston engine. It was unique in that its cylinders, instead of being open-ended cylinders containing two pistons, were instead joined in a Y-shape and had three pistons working within them.

A cam engine is a reciprocating engine where instead of the conventional crankshaft, the pistons deliver their force to a cam that is then caused to rotate. The output work of the engine is driven by this cam.

References

  1. 1 2 "How the crankshaft works – All the details". How a Car Works. Retrieved 27 August 2022.
  2. ↑ "Definition of CRANKSHAFT". Merriam-Webster Dictionary . 17 October 2024.
  3. ↑ "Crankshaft: Parts, Function, Types, Diagram & More". The Engineers Post. 27 May 2021. Retrieved 1 September 2022.
  4. ↑ McCune, R. C.; Weber, G. A. (1 January 2001). "Automotive Engine materials". Encyclopedia of Materials: Science and Technology. Elsevier. pp. 426–434. Bibcode:2001emst.book..426M. doi:10.1016/B0-08-043152-6/00086-3. ISBN   9780080431529 . Retrieved 1 September 2022.
  5. ↑ "How Does A Flywheel Work? Explained In Simple Words". Car From Japan. 13 June 2018. Retrieved 1 September 2022.
  6. ↑ "How to Build Racing Engines: Crankshafts Guide". www.musclecardiy.com. 5 April 2015. Retrieved 27 October 2019.
  7. ↑ "Flat-Plane Cranks, Part 2 — Calculating Crankshaft Secondary Forces". EngineLabs. 20 January 2022. Retrieved 28 August 2022.
  8. ↑ Bosch, Robert (2004). Automotive Handbook. Robert Bosch. p. 465. ISBN   978-0-8376-1243-0 . Retrieved 28 August 2022.
  9. ↑ "A Brief History Of The Straight-Eight Engine – Carole Nash". Carole Nash UK. Retrieved 28 August 2022.
  10. ↑ "All you need to know about stroker engines and kits". TorqueCars. 22 December 2020. Retrieved 28 August 2022.
  11. ↑ "What's the best firing order?". EngineLabs. 25 April 2017. Retrieved 30 August 2022.
  12. ↑ "Crankshaft Design Evolution". enginehistory.org. Retrieved 30 August 2022.
  13. ↑ "Flat Plane Crankshafts vs. Crossplane Crankshafts". OnAllCylinders. 15 January 2015. Retrieved 30 August 2022.
  14. ↑ "Ferrari 488 Spider debuts in Frankfurt, is faster than Lamborghini's new drop-top in every way". Autoweek. 15 September 2015. Retrieved 30 August 2022.
  15. ↑ "2016 Ferrari 488 Spider: Losing the Roof Doesn't Compromise the Magic". Road & Track. 15 October 2015. Retrieved 30 August 2022.
  16. ↑ "Difference Between Cross-Plane and Flat-Plane Cranks". MotorTrend. 15 June 2022. Retrieved 30 August 2022.
  17. ↑ "How The Flat-Plane Crank Turns Muscle Cars Into Exotics". CarBuzz. 8 April 2016. Retrieved 30 August 2022.
  18. ↑ "Crankshaft Balance Factors". Ohio Crankshaft. Retrieved 31 August 2022.
  19. ↑ "Finding Balance (Part 1): The Basics of Crankshaft Balancing". OnAllCylinders. 17 March 2016. Retrieved 31 August 2022.
  20. ↑ Nunney, Malcolm J. (2007). Light and Heavy Vehicle Technology (4th ed.). Elsevier Butterworth-Heinemann. ISBN   978-0-7506-8037-0.
  21. ↑ "Crankshaft guide – Flat vs Cross plane & lightened crankshafts". TorqueCars. 30 June 2015. Retrieved 31 August 2022.
  22. ↑ Andersson BS (1991), Company's perspective in vehicle tribology. In: 18th Leeds-Lyon Symposium (eds D Dowson, CM Taylor and MGodet), Lyon, France, 3–6 September 1991, New York: Elsevier, pp. 503–506
  23. ↑ "Cast vs Forged Crankshaft". www.dropforging.net. Retrieved 2024-07-31.
  24. ↑ Ritti, Grewe & Kessener 2007 , p. 159
  25. 1 2 Lucas 2005 , p. 5, fn. 9
  26. 1 2 3 Needham 1986 , pp. 118–119
  27. ↑ Lisheng, Feng; Qingjun, Tong (2009). "Crank-Connecting Rod Mechanism: Its Application in Ancient China and Its Origins". In Hong-Sen Yan; Marco Ceccarelli (eds.). International Symposium on History of Machines and Mechanisms. Springer Science and Business Media. p. 247. ISBN   978-1-4020-9484-2.
  28. ↑ Bautista Paz, Emilio; Ceccarelli, Marco; Otero, Javier Echávarri; Sanz, José Luis Muñoz (2010). A Brief Illustrated History of Machines and Mechanisms. Springer (published May 12, 2010). p. 19. ISBN   978-9048125111.
  29. ↑ Du Bois, George (2014). Understanding China: Dangerous Resentments. Trafford on Demand. ISBN   978-1490745077.
  30. ↑ Lisheng & Qingjun 2009 , pp. 236–249
  31. ↑ Needham, Joseph (2007). Mechanical engineering. Science and civilisation in China / by Joseph Needham Vol. 4, Physics and physical technology (6. print ed.). Cambridge: Cambridge Univ. Press. p. 114. ISBN   978-0-521-05803-2.
  32. ↑ Hartenberg, Richard S.; Schmidt, John (1969). "The Egyptian Drill and the Origin of the Crank". Technology and Culture. 10 (2): 155–165. doi:10.2307/3101475. ISSN   0040-165X. JSTOR   3101475.
  33. ↑ Ritti, Grewe & Kessener 2007 , p. 161:
    Because of the findings at Ephesus and Gerasa the invention of the crank and connecting rod system has had to be redated from the 13th to the 6th c; now the Hierapolis relief takes it back another three centuries, which confirms that water-powered stone saw mills were indeed in use when Ausonius wrote his Mosella.
  34. 1 2 Ritti, Grewe & Kessener 2007 , pp. 139–141
  35. 1 2 Ritti, Grewe & Kessener 2007 , pp. 149–153
  36. ↑ Mangartz 2006 , pp. 579f.
  37. 1 2 A. F. L. Beeston, M. J. L. Young, J. D. Latham, Robert Bertram Serjeant (1990), The Cambridge History of Arabic Literature, Cambridge University Press, p. 266, ISBN   0-521-32763-6 {{citation}}: CS1 maint: multiple names: authors list (link)
  38. ↑ al-Hassan & Hill 1992 , pp. 45, 61
  39. 1 2 Banū Mūsā; Hill, Donald Routledge (1979), The Book of Ingenious Devices (Kitáb al-Ḥiyal) by the Banú (sons of) Músà bin Shákir, Springer Publishing, pp. 23–4, ISBN   90-277-0833-9
  40. 1 2 3 Ahmad Y Hassan. The Crank-Connecting Rod System in a Continuously Rotating Machine.
  41. ↑ Sally Ganchy, Sarah Gancher (2009), Islam and Science, Medicine, and Technology , The Rosen Publishing Group, p.  41, ISBN   978-1-4358-5066-8
  42. ↑ White 1962 , p. 170
  43. 1 2 3 4 Ritti, Grewe & Kessener 2007 , p. 161: Because of the findings at Ephesus and Gerasa the invention of the crank and connecting rod system has had to be redated from the 13th to the 6th c; now the Hierapolis relief takes it back another three centuries, which confirms that water-powered stone saw mills were indeed in use when Ausonius wrote his Mosella.
  44. 1 2 3 4 Ritti, Grewe & Kessener 2007 , pp. 158, 159
  45. 1 2 Alonso i Martínez, Natalia (2015). ""Moliendo en ibero, moliendo en griego": aculturación y resistencia tecnológica en el Mediterráneo occidental durante la Edad del Hierro". Vegueta: Anuario de la Facultad de Geografía e Historia (15): 23–36. ISSN   1133-598X.
  46. ↑ Needham, Joseph (1965-01-02). Science and Civilisation in China, Part 2, Mechanical Engineering. Cambridge University Press. p. 186. ISBN   978-0-521-05803-2.
  47. ↑ Lisheng & Qingjun 2009 , pp. 248–249.
  48. ↑ Voulgaris, Aristeidis; Mouratidis, Christophoros; Vossinakis, Andreas (2023-08-27), The Initial Calibration Date of the Antikythera Mechanism after the Saros spiral mechanical Apokatastasis, arXiv: 2203.15045
  49. ↑ Carman, Christián C. (2017). "The Final Date of the Antikythera Mechanism". Journal for the History of Astronomy. 48 (3): 312–323. doi:10.1177/0021828617721553. hdl: 11336/72114 . ISSN   0021-8286.
  50. ↑ Tyaglova-Fayer, Svetlana (2023-11-14), The new reading of the 3D reconstruction of the Antikythera machine (30-day calendar) , retrieved 2024-08-25
  51. ↑ Diolatzis, Ioannis S.; Pavlogeorgatos, Gerasimos (2018-03-01). "Deepening to Antikythera mechanism via its interactivity". Digital Applications in Archaeology and Cultural Heritage. 8: 10–26. doi:10.1016/j.daach.2017.11.005. ISSN   2212-0548.
  52. ↑ Mangartz 2010 , pp. 579f.
  53. ↑ Schiöler 2009 , pp. 113f.
  54. ↑ Laur-Belart 1988 , pp. 51–52, 56, fig. 42
  55. ↑ Volpert 1997 , pp. 195, 199
  56. ↑ Wilson 2002 , p. 16
  57. ↑ Ritti, Grewe & Kessener 2007 , p. 156, fn. 74
  58. 1 2 White 1962 , p. 110
  59. ↑ Hägermann & Schneider 1997 , pp. 425f.
  60. ↑ Needham 1986 , pp. 112–113.
  61. ↑ White 1962 , p. 112
  62. 1 2 White 1962 , p. 113
  63. ↑ White 1962 , p. 114
  64. ↑ Needham 1986 , p. 113.
  65. 1 2 3 4 White 1962 , p. 111
  66. ↑ White 1962 , pp. 105, 111, 168
  67. ↑ Hall 1979 , pp. 74f.
  68. ↑ White 1962 , p. 167
  69. ↑ Donald Hill (2012), The Book of Knowledge of Ingenious Mechanical Devices, page 273, Springer Science + Business Media
  70. ↑ Hall 1979 , p. 80
  71. ↑ Townsend White, Lynn (1978). Medieval Religion and Technology: Collected Essays . University of California Press. p. 335. ISBN   9780520035669.
  72. ↑ White 1962 , p. 172

Sources

This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.