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using an interference fit with the small end eye instead, with the gudgeon pin journals in the piston functioning as bearings. This arrangement is usually more difficult to manufacture and service because two bearing surfaces or inserted sleeves complicate the design. In addition, the pin must be precisely set so that the small end eye is central. Because of
173:. No interference fit is used in any instance and the pin 'floats' entirely on bearing surfaces. The average rubbing speed of each of the three bearings is halved and the load is shared across a bearing that is usually about three times the length of the semi-floating design with an interference fit with the piston.
156:
into the eye of the small end, which has an interference fit with the aperture of the small end. During overhaul, it is usually possible to replace this bearing sleeve if it is badly worn. The reverse configuration, fixing the gudgeon pin to the connecting rod instead of to the piston, is implemented
81:
that may be physically separated from both the connecting rod and piston or crosshead. The design of the gudgeon pin, especially in the case of small, high-revving automotive engines is challenging. The gudgeon pin has to operate under some of the highest temperatures experienced in the engine, with
98:
loads, with some of the highest pressure loadings of any bearing in the whole engine. To overcome these problems, the materials used to make the gudgeon pin and the way it is manufactured are amongst the most highly engineered of any mechanical component found in internal combustion engines.
64:
that connects to the piston via a rod. A gudgeon is a pivot or journal. The origin of the word gudgeon is the Middle
English word gojoun, which originated from the Middle French word goujon. Its first known use was in the 15th century.
161:
considerations, this arrangement was more usual for single-cylinder engines as opposed to multiple cylinder engines with long cylinder blocks and crankcases, until precision manufacturing became more commonplace.
169:
In the fully floating configuration, a bearing surface is created both between the small end eye and gudgeon pin and the journal in the piston. The gudgeon pins are usually secured with
309:
144:
bearing thus acts as the bearing alone. In this configuration, only the small end bearing requires a bearing surface, if any. If needed, this is provided by either
302:
56:, and provides a bearing for the connecting rod to pivot upon as the piston moves. In very early engine designs, including those driven by
118:
Typical construction of gudgeon pin (wrist pin) is shown on the picture. The design depend on technological and technical effectiveness.
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243:
The Sizes of Motors for Trucks and
Outline of British Practice in This Field: Part Two: Outline of British Truck Motor Design
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due to its location, while remaining small and light so as to fit into the piston diameter and not unduly add to the
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Nunney, Malcolm James (2007) "The
Reciprocating Piston Petrol Engine: Gudgeon pins and their location"
34:
90:. The requirements for lightness and compactness demand a small diameter rod that is subject to heavy
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149:
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Hillier, Victor Albert Walter and
Pittuck, Frank William (1991) "The Petrol Engine: Gudgeon pins"
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60:, and many very large stationary or marine engines, the gudgeon pin is located in a sliding
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In the semi-floating configuration, the pin is usually fixed relative to the piston by an
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Gudgeon pins use two broad design configurations: semi-floating and fully floating.
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Webster's
Seventh New Collegiate Dictionary, G & C Merriam Company, 1963, p. 370
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the small end bearing journal with a suitable metal, or more usually by inserting a
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Gudgeon pin connection at connecting rod. Gudgeon pin fits into
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short hollow rod made of a steel alloy of high strength and
246:(in Estonian). The Automobile . 1916. pp. 502–504.
271:(4th ed.) Stanley Thornes Pub., Cheltenham, England,
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211:(4th ed.) Butterworth-Heinemann, Oxford, UK,
16:Pin that holds connecting rod to piston head
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133:in the piston. (This replaced the earlier
269:Fundamentals of Motor Vehicle Technology
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324:components, systems and terminology
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209:Light and heavy vehicle technology
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73:The gudgeon pin is typically a
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456:Capacitor discharge ignition
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114:Construction of gudgeon pin
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35:internal combustion engines
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466:Electronic fuel injection
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48:US English) connects the
512:Aircraft engine starting
557:Mean effective pressure
46:wrist pin or piston pin
597:Time between overhauls
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30:
872:Ice protection system
612:Volumetric efficiency
577:Overhead valve engine
113:
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857:Auxiliary power unit
737:Flight data recorder
826:Pressure carburetor
562:Naturally aspirated
532:Engine displacement
841:Updraft carburetor
715:Engine instruments
641:Propeller governor
537:Four-stroke engine
184:List of auto parts
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88:reciprocating mass
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903:Engine components
898:Engine technology
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722:Annunciator panel
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602:Two-stroke engine
572:Overhead camshaft
552:Manifold pressure
522:Compression ratio
221:978-0-7506-8037-0
159:thermal expansion
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867:Hydraulic system
687:Counter-rotating
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383:Hydraulic tappet
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150:sleeve bearing
146:electroplating
139:connecting rod
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103:Design options
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877:Recoil start
836:Turbocharger
831:Supercharger
697:Single-blade
607:Valve timing
428:Sleeve valve
413:Poppet valve
388:Main bearing
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821:Intercooler
747:Hobbs meter
672:Blade pitch
667:Autofeather
660:Terminology
567:Monosoupape
527:Dead centre
500:Terminology
408:Piston ring
378:Gudgeon pin
84:lubrication
892:Categories
811:Gascolator
801:Carburetor
752:Tachometer
634:Components
626:Propellers
542:Horsepower
507:Air-cooled
486:Spark plug
451:Alternator
444:components
442:Electrical
423:Rocker arm
363:Crankshaft
341:components
339:Mechanical
190:References
44:(English,
471:Generator
142:small end
135:set screw
129:with the
62:crosshead
775:Throttle
692:Scimitar
398:Oil pump
368:Cylinder
358:Crankpin
348:Camshaft
319:Aircraft
178:See also
171:circlips
79:hardness
69:Overview
27:gudgeons
651:Spinner
491:Starter
481:Magneto
418:Pushrod
252:5276931
131:journal
96:bending
52:to the
40:gudgeon
789:system
592:Stroke
433:Tappet
403:Piston
278:
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219:
75:forged
50:piston
37:, the
796:Avgas
732:EICAS
273:p. 34
213:p. 28
92:shear
58:steam
785:Fuel
727:EFIS
517:Bore
276:ISBN
248:OCLC
217:ISBN
94:and
152:or
42:pin
33:In
894::
260:^
215:,
198:^
311:e
304:t
297:v
254:.
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