US2426753A - Crankshaft for two-stroke engines with twelve cylinders in line - Google Patents

Crankshaft for two-stroke engines with twelve cylinders in line Download PDF

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Publication number
US2426753A
US2426753A US501046A US50104643A US2426753A US 2426753 A US2426753 A US 2426753A US 501046 A US501046 A US 501046A US 50104643 A US50104643 A US 50104643A US 2426753 A US2426753 A US 2426753A
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US
United States
Prior art keywords
crankshaft
line
stroke engines
cranks
cylinders
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.)
Expired - Lifetime
Application number
US501046A
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English (en)
Inventor
Steiger Jacques
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.)
Sulzer AG
Original Assignee
Sulzer AG
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 Sulzer AG filed Critical Sulzer AG
Application granted granted Critical
Publication of US2426753A publication Critical patent/US2426753A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F16F15/22—Compensation of inertia forces
    • F16F15/24—Compensation of inertia forces of crankshaft systems by particular disposition of cranks, pistons, or the like
    • 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
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • 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
    • F02B2075/1848—Number of cylinders twelve
    • 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
    • F02B75/20—Multi-cylinder engines with cylinders all in one line
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2173—Cranks and wrist pins
    • Y10T74/2174—Multiple throw
    • Y10T74/2175—Sectional

Definitions

  • the invention relates to a crankshaft for twostroke engines with 12 cylinders in line having a uniform cranksetting of 12 x 30 and is characterised in that the two halves of the crankshaft differ from eachother, that is to say the two halves of the crankshaft are not interchangeable and have the firing sequence of 1, 6, 11, 7, 3, 5, 10, 9, 2, 4, 12, 8, by means of which the critical speed of the 6th order is eliminated.
  • counterweights may be arranged on all the cranks.
  • cranks in two-stroke engines with 12 cylinders in line those with the twelve cranks all set at 30, an arrangement which gives the best balanced crank effort diagram, are the ones which come into consideration first of all. Selected from this number are those with perfectly balanced masses and without free forces and moments of the 1st and 2nd order; and the preference goes to those having small internal moments, as great moments in the case of long engines such as the twelvecylinder type might give rise to dangerous bending vibration.
  • Figs. 1, 3 and 5 are diagrammatic views relative to a known form of crankshaft
  • Figs. 2, 4 and 6 are diagrammatic views relative to the improved form of crankshaft forming the subject matter of the present invention
  • Figs. 7, 8 and 9 are diagrams which will be more completely described hereinafter
  • Fig. 10 is anelevational view of a crankshaft embodying the present invention
  • Fig. 11 is an enlarged elevational view of the righthand half of the crankshaft shown in Fig. 10
  • Fig. 12 is an end view of the half of the crankshaft shown in Fig. 11
  • Fig. 13 is a view similar to Fig. 11 of the left-hand half of the crankshaft shown in Fig. 10
  • Fig. 14 is an end View of the half of the crankshaft shown in Fig. 13.
  • Fig. 1 shows the cranksequence of a known form of execution with a regular arrangement of the 12 cranks at 30. and the firing order of 1, 6, 8, 10, 3, 5, 7, 12,2, 4, 9, 11.
  • the two crankshaft halves are identical and interchangeable.
  • Fig. 3 illustrates the corresponding crank sequence of the 6th order with the cranks l, 2, 3, '1, 8, 9 turned upwards and cranks 4, 5, 6, 10, 11, 12 turned downwards.
  • Fig. 5 gives the corresponding vector diagram with the strong resultant harmonic force 6th order Rs.
  • Fig. '7 shows the computed form of the singlenode oscillation, which serves to determine the vector diagram according to Figs. 5 and 6.
  • the cylinders 1-6 to the left of node K are reckoned positive, and 7-12 to the right of the nod negative.
  • twelve-cylinder engines with regular arrangement of the 12 cranks at 30 have light flywheels only, so that the oscillation node is in the neighbourhood of the centre of the engine.
  • Fig. 8 shows the distribution of the critical speeds and the height of the additional stresses T for the crank sequence according to Fig. 1 with the shaded, dangerous critical region of the 6th order in the proximity of the normal service 3 4 tional stresses, which would inevitably lead to the in each shaft half in the crank arrangement fracture of the crankshaft.
  • Counterweights on the cranks is eliminated by the present invention, as can .be also diminish or exclude the centrifugal forces seen from the further drawings. from the eccentrically rotating masses of the reversed.
  • crankshaft is and cannot be interchanged. shown" Figs. 10. ,to 14.
  • the complete crank- Fig. 4 reproduces the crank isiequenc'e "of "the 'iS'h hqw j fin Fig. 10 and comprises a left- 6th order corresponding to F]; A 1, 2, 3, 10, 11, 12 turned rd'sa; 5, 6, '7, 8, 9, turned downwards.
  • Fig. 6 shows the new vector diagram, corre- 15 sponding to Figs. 2 and 4 andagaindrawn on 3.0 on center, and the cranks of the two halves the basis of the form of vibration, cbinpiitedace are-differently arra ged, an a ly, so that they cording to Fig. '7.
  • the cylinders 1-6 to thejeft 16. e e a le. o the end Views of Figs. of the node are again given the positive eig'mena "an it will be noted that the er of the 7:12 .tg th right f t node'the negative sign.
  • cranks consecutively around the axis of the or b qe her almost eseem'se erar k snart is thep diagrammatically indicated Zfaiiddescribedalioye Thosefigures a-lso thaytn annuiar"dis dsitienefthe eiafiks n half consecutively is 39 and "90 altern ti'v 1y, so that the ori isneeaer'zhe e'th RQman numerals.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
US501046A 1943-01-30 1943-09-03 Crankshaft for two-stroke engines with twelve cylinders in line Expired - Lifetime US2426753A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2426753X 1943-01-30

Publications (1)

Publication Number Publication Date
US2426753A true US2426753A (en) 1947-09-02

Family

ID=4569176

Family Applications (1)

Application Number Title Priority Date Filing Date
US501046A Expired - Lifetime US2426753A (en) 1943-01-30 1943-09-03 Crankshaft for two-stroke engines with twelve cylinders in line

Country Status (5)

Country Link
US (1) US2426753A (fr)
CH (1) CH239612A (fr)
DE (1) DE938634C (fr)
FR (1) FR900859A (fr)
NL (1) NL72453C (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1032027B (de) * 1955-12-28 1958-06-12 Werkspoor Nv Zwoelfzylinder-Zweitaktbrennkraftmaschine, bei welcher die Zylinder in einer Reihe angeordnet sind

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1476812A (en) * 1921-10-27 1923-12-11 Champion Machine & Forging Com Method of making counterbalanced crank shafts
US1780947A (en) * 1925-07-14 1930-11-11 Schron Hans Crank shaft

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE429849C (de) * 1923-08-31 1926-06-03 Rudolf Dreves Verfahren zur Verminderung von Drehschwingungen
DE636814C (de) * 1932-01-07 1936-10-20 Henry Charles Alexandre Potez Zweitaktbrennkraftmaschine
DE669126C (de) * 1934-06-22 1938-12-17 Fried Krupp Germaniawerft Akt Ausgleich von Drehschwingungen, und zwar der gleichphasigen Harmoniuschen 2n+1/2.i-ter Ordnung, bei Viertaktbrennkraftmaschinen mit ungerader Zylinderzahl und gleichmaessiger Kurbelversetzung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1476812A (en) * 1921-10-27 1923-12-11 Champion Machine & Forging Com Method of making counterbalanced crank shafts
US1780947A (en) * 1925-07-14 1930-11-11 Schron Hans Crank shaft

Also Published As

Publication number Publication date
FR900859A (fr) 1945-07-11
DE938634C (de) 1956-02-02
CH239612A (de) 1945-10-31
NL72453C (fr)

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