GB2290122A - Engine flywheel - Google Patents

Engine flywheel Download PDF

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Publication number
GB2290122A
GB2290122A GB9411629A GB9411629A GB2290122A GB 2290122 A GB2290122 A GB 2290122A GB 9411629 A GB9411629 A GB 9411629A GB 9411629 A GB9411629 A GB 9411629A GB 2290122 A GB2290122 A GB 2290122A
Authority
GB
United Kingdom
Prior art keywords
flywheel
engine
crankpins
twin cylinder
norton
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9411629A
Other versions
GB9411629D0 (en
GB2290122B (en
Inventor
Nigel Hurrion
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB9411629A priority Critical patent/GB2290122B/en
Publication of GB9411629D0 publication Critical patent/GB9411629D0/en
Publication of GB2290122A publication Critical patent/GB2290122A/en
Application granted granted Critical
Publication of GB2290122B publication Critical patent/GB2290122B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/06—Engines with means for equalising torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/30—Flywheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B2075/1804—Number of cylinders
    • F02B2075/1808—Number of cylinders two

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

A flywheel to fit a parallel twin cylinder motorcycle engine, such as a Norton twin cylinder motorcycle engine, such that it allows the crankpins to be separated by an angle determined by the mathematical formula Cos theta = s DIVIDED 4 * C Where S = the stroke of the engine C = the length between centres of the connecting rod theta = the angle of separation of the crankpins There is an accompanying drawing that shows as an example a flywheel adapted to fit a Norton twin cylinder motorcycle engine. Figure 1 shows a plan view and figure 2 shows an end elevation. <IMAGE>

Description

Engine Flywheel This invention appertains to a motorcycle engine flywheel.
A flywheel is an integral component of an engine. Motorcycle engines of the parallel twin type are well known in the motorcycle field having been constructed by many manufacturers, particularly in the U.K. in the previous fifty years. However, this type of engine is prone to 'high' levels of vibration and limited 'throttle response' which is further compounded by a 'heavy' flywheel.
According to the present invention there is provided a flywheel such that it allows the crankpins of a parallel twin cylinder engine to be separated by an angle determined by the mathematical formula s Cos e = 4 * C Where S = the stroke of the engine C 5 the length between centres of the connecting rod e = the angle of separation of the crankpins The angle of separation is the main essential feature. The other features are that a method, such as holes, is provided so that flywheel balance weights can be attached. A hole is provided to allow oil to pass from one crankpin to the other and the flywheel is lighter in weight than it would otherwise have been.
With reference to the accompanying drawling, figure 1 shows a view of a flywheel, as an example, with holes to allow the crankpins to be spaced according to the above formula, to give an example : In a Norton twin engine 3.5 cos e - ---------- 4 * 5.875 this leads to e = 81.4 N.Bs it is normal engineering practice to allow for a 'production' tolerance which as an example could be + or - 1 and this must also apply in this case. It should also he noted that an engine so equipped at a later stage with this type of flywheel will need the camshaft and ignition timing of the engine altered, by any means, to allow the above flywheel to be used in practice. The large oil hole shown in figure 1 is an example and does not necessarily have to be this shape. The drawing is not necessarily to exact scale.
Figure 2 on the drawing shows a side elevation of the flywheel.

Claims (5)

1 A flywheel to fit a Parallel twin cylinder motorcycle engine, such as a Norton twin cylinder. such that it alluws the crankpins to be separated by an angle determined by the mathematical formula 5 Cos e = 4*C Where S = the stroke of the engine C = the length between centres of the connecting rod e = the angle of separation of the clankpins
2 A flywheel as in claim 1 so adapted to fit a Norton twin cylinder motorcycle engine.
3 A flywheel as in claim 1 and 2 with a hole to provide for the passage of oil between the crankpins.
4 A flywheel as in claims 1 2 and 3 with a method to allow the attachment of balance weights.
5 A flywheel as in all previous claims so adapted as to allow for machining tolerances and with specific reference to the calculated angle in claim 1.
GB9411629A 1994-06-10 1994-06-10 Engine Expired - Fee Related GB2290122B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9411629A GB2290122B (en) 1994-06-10 1994-06-10 Engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9411629A GB2290122B (en) 1994-06-10 1994-06-10 Engine

Publications (3)

Publication Number Publication Date
GB9411629D0 GB9411629D0 (en) 1994-08-03
GB2290122A true GB2290122A (en) 1995-12-13
GB2290122B GB2290122B (en) 1998-02-18

Family

ID=10756510

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9411629A Expired - Fee Related GB2290122B (en) 1994-06-10 1994-06-10 Engine

Country Status (1)

Country Link
GB (1) GB2290122B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5931945B2 (en) * 2014-03-18 2016-06-08 三菱重工業株式会社 Flywheel and marine diesel engines

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB872684A (en) * 1959-01-30 1961-07-12 Norton Motors Ltd Improvements in reciprocating internal combustion engines
GB1220767A (en) * 1968-09-25 1971-01-27 Klockner Humboltd Deutz A G A two-cylinder four-stroke-cycle reciprocating-piston internal combustion engine
GB1274911A (en) * 1968-06-12 1972-05-17 Caterpillar Tractor Co Internal combustion engine with hydrodynamic retarder
GB1476328A (en) * 1975-01-28 1977-06-10 Knowles Sons Ltd R Power take-off for internal combustion engines
GB1485297A (en) * 1973-12-07 1977-09-08 Daimler Benz Ag Reciprocating-piston engine
GB1528516A (en) * 1975-04-18 1978-10-11 List H Low-noise-level internal combustion engines
GB2061449A (en) * 1979-10-11 1981-05-13 Davis Tool & Eng Co Flywheel
GB2114709A (en) * 1982-01-26 1983-08-24 Nissan Motor Flywheel for internal combustion engine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB272678A (en) * 1926-06-11 1927-06-23 Clinton Lee Walker Improvements in and relating to crank shafts for four-cylinder engines
GB628513A (en) * 1946-05-23 1949-08-30 Paul Harmon Davey Two-cylinder crank throw arrangement
GB789342A (en) * 1955-01-22 1958-01-22 Raymond Georges Improvements in internal combustion piston engines especially for use on motor vehicles
US3978828A (en) * 1972-08-14 1976-09-07 Caterpillar Tractor Co. V-Type internal combustion engine
FR2273186B1 (en) * 1974-05-31 1977-09-30 Semt
US4519344A (en) * 1981-11-07 1985-05-28 Honda Giken Kogyo Kabushiki Kaisha V-type internal combustion engine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB872684A (en) * 1959-01-30 1961-07-12 Norton Motors Ltd Improvements in reciprocating internal combustion engines
GB1274911A (en) * 1968-06-12 1972-05-17 Caterpillar Tractor Co Internal combustion engine with hydrodynamic retarder
GB1220767A (en) * 1968-09-25 1971-01-27 Klockner Humboltd Deutz A G A two-cylinder four-stroke-cycle reciprocating-piston internal combustion engine
GB1485297A (en) * 1973-12-07 1977-09-08 Daimler Benz Ag Reciprocating-piston engine
GB1476328A (en) * 1975-01-28 1977-06-10 Knowles Sons Ltd R Power take-off for internal combustion engines
GB1528516A (en) * 1975-04-18 1978-10-11 List H Low-noise-level internal combustion engines
GB2061449A (en) * 1979-10-11 1981-05-13 Davis Tool & Eng Co Flywheel
GB2114709A (en) * 1982-01-26 1983-08-24 Nissan Motor Flywheel for internal combustion engine

Also Published As

Publication number Publication date
GB9411629D0 (en) 1994-08-03
GB2290122B (en) 1998-02-18

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20030610