US2006498A - Internal combustion engine - Google Patents

Internal combustion engine Download PDF

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Publication number
US2006498A
US2006498A US716385A US71638534A US2006498A US 2006498 A US2006498 A US 2006498A US 716385 A US716385 A US 716385A US 71638534 A US71638534 A US 71638534A US 2006498 A US2006498 A US 2006498A
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United States
Prior art keywords
cam
piston
roller
shaft
stroke
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
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US716385A
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English (en)
Inventor
Dasset Emile
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Individual
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Individual
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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
    • F02B41/00—Engines characterised by special means for improving conversion of heat or pressure energy into mechanical power
    • F02B41/02—Engines with prolonged expansion
    • F02B41/04—Engines with prolonged expansion in main cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B9/00—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00
    • F01B9/04—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00 with rotary main shaft other than crankshaft
    • F01B9/06—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00 with rotary main shaft other than crankshaft the piston motion being transmitted by curved surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B9/00—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00
    • F01B9/04—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00 with rotary main shaft other than crankshaft
    • F01B9/06—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00 with rotary main shaft other than crankshaft the piston motion being transmitted by curved surfaces
    • F01B2009/061—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00 with rotary main shaft other than crankshaft the piston motion being transmitted by curved surfaces by cams
    • F01B2009/063—Mono-lobe cams
    • 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
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/18296—Cam and slide

Definitions

  • explosion motors according to which the pistons generally diametrically opposed with relation to the shaft, operate by means of rollers mounted at the ends of the piston rods, and bearing on cams secured on the shaft.
  • the present invention is the result of long and numerous experiments onnewly constructed env in space is limitedby the existing casing.
  • the invention is designed to be applied more particularly to engines with cylinders in. a row, each piston acting "upon a, separate cam; the invention can however beapplied to engines with radially disposed cylinders, .but each piston must work independently. ;;
  • the invention is characterized essentially by the fact. that-the, motive roller of each: piston, that is the roller which thrusts against thecorresponding cam duringthe expansion stroke of the piston, is shifted laterally in relation to the straight line which is parallel. to the axis of the cylinder and intersects the axis of the shaft.
  • the motive rollerf is combined with a guide roller carried by a rigid element supporting the motive roller
  • the guide-roller fulfills several functions: In the first place it produces the admission stroke of the-"piston, secondly it limits the, exhaust stroke'of the piston and prevents same from knocking against the piston-head by force of inertia.
  • the lateral displacement or shift of the motive roller enables to obtain an infinite number of profiles for the cam giving high mechanical efficiency; it also enables, for a determined length of the stroke, considerably to reduce the space required for the cams, and to avoid undesirable reactions principally when the cam acts uponthe rollers for the exhaust, admission and compression strokes.
  • the profile of the cam, in the portion thereof which engages the roller or rollers to force displacement of the piston is established in such a: manner that at each instant the point of contact j between the cam and'the respective roller is on the line described by the centre of the respective roller, or at the utmost on the straight line which joins the centre of the respective roller to the.
  • Fig. l- is a schematical view in section of an engine of the type considered in this specification,-
  • Figs. 2 to 6 are profiles of' cams with the rollers, and showthe manner of obtaining'same
  • the same stroke of the piston willbe considered, also a lateral displacement of each roller equal to the radius of the rollers, the two rollers having the same radius.
  • the vertical lines passing through the axis ofrotation of the cam and the axis of the motive roller are distant by a length equal to the radius of the shaft. It will be assumed that each roller has a diameter qual to the diameter of the-shaft, and that both rollers move vertically.
  • Fig, 1 schematically illustratesthe mountingof a cylinder and piston in relation to the corresponding cam.
  • ] is the casing of the engine, inside which is mounted the power shaft 3
  • the cylinders 32 are mounted in a line above the casing; the piston 33 has pivotally connected thereto the piston rod 34 which extends right into the casing 30 and is provided with a slotted portion through which extends the shaft 3 I.
  • slot 35 has an inner width equal to the diameterof the shaft and a length equal to the stroke of the piston.
  • the extended portion of the piston rod comprises two' identical and par allel slotted portions disposed 'on either. side of.
  • a circle 3 having a radius equal for instance to V of the piston-stroke is described.
  • the vertical diameter is drawn, and on either side of this vertical diameter, at a distance equal to the diameter of the power shaft, the two vertical lines I, 2 are drawn.
  • a centre 4 outside circle 3 is chosen in such a manner that a circle 5 described from such a centre, with the radius of the motive roller, is tangent to circle 3.
  • This circle 5 shows the motive roller in the position it will occupy at the instant of the explosion, or a moment after.
  • the power receiving portion of the cam that is the portion of the cam engaged by the motive roller during the expansion will be a curve with a continuously decreasing radius in relation to point 0, and which is comprised between the half circle 6I, and a straight line 6-8 end-,
  • the position of the centre of the lower roller 9 isdetermined as follows: from a centre taken on line I there is described a portion II! of a circle cor- I i responding to the lower position of the roller 5;
  • the non-motive portion of the cam must be such that on all those points the contact with the motive roller and with the lower roller is on the lines I and'2 respectively.
  • a centre with a radius 0'6 a circle I2 is described; radius 0 I I intersects V r l2 connected at both ends. At' both ends and outthe clrcle at pomt a and am 6 '3 b dmded equally, for instance in eight equal portions. Radii are drawn through the points of division. On one of the lines I or 2, eight centres are marked, corresponding .to the positions of the centre of the 2;o0e,'49e
  • both the rollers with the cam may be provided;
  • motive portion of the cam is'determined according to this invention by extending the radii which have given the'points "II and.- II to".
  • On the vertical line] are drawn thearcs of circles corresponding to the different portions of the roller at each successive eighthof thestroke, and onejoins point O with the various points occupied" by the centre of the roller-"on the-vertical line I.
  • These lines intersectthe respective circles at points 23, 24,25 etc. From 0 as a-c'entr'e 23 is transferred to 21-, 24 to 28 and so on, which provides the dotted line curve shown in Fig. 2, not very different from the full line curve.
  • Fig. 3 shows an example of a cam profile determined as the full line portion of Fig. 2, but with this difference that the radius of the primitive circle 3 is equal, not to 7/8ths of the stroke but to the whole stroke.
  • portion 6-! of the cam coincides exactly with the left hand half portion of circle 3, Whereas the nonmotive portion of the cam, determined as in Fig. 2 by the points l4! 5 and under the same conditions intersects the circle 3.
  • Such a profile of cam ensures an absolutely constant speed of the piston during the expansion.
  • Fig. 4 a modification has been illustrated, according to which the rollers have been disposed the other way round in relation to the axis of rotation of the cam, with a different lateral displacement for each roller. From the centre 0, with a radius equal to the 7/8ths of the stroke, a circle 3 is described. On the right hand side of this centre and at a distance equal to half the radius of the motive shaft, the vertical line I is drawn,whereas thevertical line 2 is drawn on the left hand side at a distance equal to 3/2 of else, a permanentcontact of the 'shaft is determined as in Fig. :2 Ion the 'vertical line at equal-distance from lines I and 2. The vJcentre of the bottom roller for-the higher position'thereof is determined as in'Fig. 2,which gives the position '9 in dotted lines.
  • the right hand portion 6, I l .of the curve isdetermined in the same wayas before,-by dividingthe arc 'B.-
  • Fig. 5' shows, a modification of Fig. 4, accordtions'of being tangent whereas-the other por tiorr is-y'practically identical to the corresponding portion" in Fig. 4.
  • the position of the bottom roller which corresponds to the upper position of roller 5 is again angularly displaced with relation to the extreme upper portion 9 of the lower roller.
  • Fig. 6 gives an example of a cam devised for producing a powerful engine torque at the beginning of the stroke or at the explosion, together with a rapid descent of the piston at the beginning of the expansion stroke. It will be obvious that these conditions'would be best fulfilled by the cam profile 6-8 in Fig. 2, but this profile has the inconvenience of producing knocks on account of the successive losses of contact between the rollers and the cam.
  • Internal combustion engine comprising in combination a power shaft, a piston 'movable in' a plane perpendicular to said shaft, a piston rod terminating with a slotted portion, said power shaft being engaged through the slot and the slot having a length equal to the stroke of the piston plus the diameter of the power shaft and a width equal to the diameter of the power shaft,- a cam secured on the power shaft, a roller freely rotatably mounted at each end of said slotted portion of said piston rod and rolling on thepecircle and it will be seen that at the startthe torque is very powerful. Whilst remaining with in the limits indicated in Fig. 2 concerning the:
  • Internal combustion engine comprising in combination a power shaft, a piston movable in a plane perpendicular to said shaft, a piston rod terminating with .a slotted portion, said power shaft being engaged through the slot and the slot having a length equal to the stroke of the piston plus the diameterof the power shaft and a width equal to the diameter of the power shaft, a cam securedon the power shaft, a roller freely rotatably mounted at each end of the slotted portion of said piston rod and rolling on the periphery of the corresponding cam whereby said piston operates said power shaft, the two rollers of said piston rod being of equal diameter and.
  • the said cam for said piston having a portion upon which acts the motive roller of the piston to force rotation of the power shaft formedof a portion of a curve comprised between a circle excentered with relation to the axis of the power shaft and a straight line joining the portion-of large radius to the portion of smaller radius of the cam, and a portion which acts upon theother roller to operate compression stroke of the piston, such that the point of contact with the latter roller is comprised between the straight line described by the centre of said roller and the straight line joining the centre of said roller to the centre of the shaft.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transmission Devices (AREA)
US716385A 1934-01-15 1934-03-19 Internal combustion engine Expired - Lifetime US2006498A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE2006498X 1934-01-15

Publications (1)

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US2006498A true US2006498A (en) 1935-07-02

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FR (1) FR775940A (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3025840A (en) * 1957-04-10 1962-03-20 Casini Carlo Romano Carburetion engine with variablevolume combustion chamber
US3063646A (en) * 1960-02-29 1962-11-13 Nelson Mfg Co Inc L R Sprinkler oscillating mechanism
US3199359A (en) * 1962-05-01 1965-08-10 Earl F Beezer Motion transmitting device
US3985114A (en) * 1975-05-19 1976-10-12 Alto Automotive, Inc. Apparatus for shock mounting of piston rods in internal combustion engines and the like
US4526141A (en) * 1983-02-15 1985-07-02 The Commonwealth Of Australia Drive arrangement for internal combustion engine
EP0702128A1 (fr) * 1994-09-13 1996-03-20 POMEZIA S.r.l. Mécanisme maneton-bielle pour la transformation d'un mouvement alternatif en un mouvement rotatif
US5711267A (en) * 1996-11-01 1998-01-27 Williams; Kenneth A. Internal combustion engine with optimum torque output
US5890465A (en) * 1996-11-01 1999-04-06 Williams; Kenneth A. Internal combustion engine with optimum torque output
US6347610B1 (en) * 1997-06-20 2002-02-19 Cyril Andrew Norton Engine
US20100326390A1 (en) * 2009-06-25 2010-12-30 Onur Gurler Half cycle eccentric crank-shafted engine
US20120204661A1 (en) * 2011-02-11 2012-08-16 Cng-Design. Llc Fixed Moment Arm Internal Gear Drive Apparatus
US20170342898A1 (en) * 2016-04-08 2017-11-30 James L. O'Neill Asymmetric cam transmission
US20180156108A1 (en) * 2016-04-08 2018-06-07 James L. O'Neill Asymmetric cam transmission with coaxial counter-rotating output shafts
US11261946B2 (en) * 2016-04-08 2022-03-01 James L. O'Neill Asymmetric cam transmission with coaxial counter rotating shafts

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1168163B (de) * 1957-04-10 1964-04-16 Carlo Romano Casini Brennkraftkolbenmaschine
FR2442999A1 (fr) * 1978-06-26 1980-06-27 Valsecchi Serge Dispositif mecanique transformant le mouvement rectiligne alternatif en mouvement rotatif
FR2445435A1 (fr) * 1978-12-29 1980-07-25 Vignot Martial Dispositif permettant a un moteur a pistons a combustion interne d'utiliser toute l'energie mecanique des gaz de combustion

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3025840A (en) * 1957-04-10 1962-03-20 Casini Carlo Romano Carburetion engine with variablevolume combustion chamber
US3063646A (en) * 1960-02-29 1962-11-13 Nelson Mfg Co Inc L R Sprinkler oscillating mechanism
US3199359A (en) * 1962-05-01 1965-08-10 Earl F Beezer Motion transmitting device
US3985114A (en) * 1975-05-19 1976-10-12 Alto Automotive, Inc. Apparatus for shock mounting of piston rods in internal combustion engines and the like
US4526141A (en) * 1983-02-15 1985-07-02 The Commonwealth Of Australia Drive arrangement for internal combustion engine
EP0702128A1 (fr) * 1994-09-13 1996-03-20 POMEZIA S.r.l. Mécanisme maneton-bielle pour la transformation d'un mouvement alternatif en un mouvement rotatif
US5647308A (en) * 1994-09-13 1997-07-15 Pomezia S.R.L. Crank mechanism system for the transformation of reciprocating linear motion into rotary motion, particularly suitable for reciprocating endothermic engines
US5890465A (en) * 1996-11-01 1999-04-06 Williams; Kenneth A. Internal combustion engine with optimum torque output
US5711267A (en) * 1996-11-01 1998-01-27 Williams; Kenneth A. Internal combustion engine with optimum torque output
US6347610B1 (en) * 1997-06-20 2002-02-19 Cyril Andrew Norton Engine
US20100326390A1 (en) * 2009-06-25 2010-12-30 Onur Gurler Half cycle eccentric crank-shafted engine
US8281764B2 (en) 2009-06-25 2012-10-09 Onur Gurler Half cycle eccentric crank-shafted engine
US20120204661A1 (en) * 2011-02-11 2012-08-16 Cng-Design. Llc Fixed Moment Arm Internal Gear Drive Apparatus
US20170342898A1 (en) * 2016-04-08 2017-11-30 James L. O'Neill Asymmetric cam transmission
US20180156108A1 (en) * 2016-04-08 2018-06-07 James L. O'Neill Asymmetric cam transmission with coaxial counter-rotating output shafts
US10473027B2 (en) * 2016-04-08 2019-11-12 James L. O'Neill Asymmetric cam transmission with coaxial counter-rotating output shafts
US10598090B2 (en) * 2016-04-08 2020-03-24 James L. O'Neill Asymmetric cam transmission
US11261946B2 (en) * 2016-04-08 2022-03-01 James L. O'Neill Asymmetric cam transmission with coaxial counter rotating shafts

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Publication number Publication date
FR775940A (fr) 1935-01-12

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