EP0314773B1 - Machine motrice ou de travail, notamment machine a combustion interne - Google Patents

Machine motrice ou de travail, notamment machine a combustion interne Download PDF

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Publication number
EP0314773B1
EP0314773B1 EP88905184A EP88905184A EP0314773B1 EP 0314773 B1 EP0314773 B1 EP 0314773B1 EP 88905184 A EP88905184 A EP 88905184A EP 88905184 A EP88905184 A EP 88905184A EP 0314773 B1 EP0314773 B1 EP 0314773B1
Authority
EP
European Patent Office
Prior art keywords
engine
cylindrical portion
rod portion
piston
connecting rod
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
EP88905184A
Other languages
German (de)
English (en)
Other versions
EP0314773A1 (fr
Inventor
Gerhard Mederer
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
Priority claimed from DE19873715391 external-priority patent/DE3715391A1/de
Application filed by Individual filed Critical Individual
Priority to AT88905184T priority Critical patent/ATE66721T1/de
Publication of EP0314773A1 publication Critical patent/EP0314773A1/fr
Application granted granted Critical
Publication of EP0314773B1 publication Critical patent/EP0314773B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02B75/00—Other engines
    • F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
    • F02B75/048—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable crank stroke length

Definitions

  • the invention relates to an engine or working machine, in particular an internal combustion engine with an upper connecting rod section and a lower connecting rod section between the piston and the crankshaft, which are connected to one another by a common joint and in which the two connecting rod sections are supported by an articulated pivot lever on an axle fixed to the motor housing.
  • the upper connecting rod section has a strip-shaped web symmetrically in the longitudinal center plane with a cylinder section arranged at the end facing away from the piston, the partial sections of which project beyond the web on both sides and support ring parts of the lower connecting rod section and in that in the upper cylinder section the web plane and recesses are provided in the lower connecting rod section between the ring parts, which are penetrated transversely by a bolt which is eccentrically mounted in the cylinder section at a distance from the cylinder section axis and on which the pivot lever engages with one end.
  • the web allows bending stresses to be absorbed and compensated for within limits. Furthermore, a narrow construction of the connecting rod is achieved, so that the counterweights of the crankshaft are kept low and can be designed to save space.
  • the lower connecting rod section is formed by halves connected to one another over a partial length by clamping members, for example screws, which each have one of the ring parts on the piston-side ends, the common width of both connecting rod section halves is equal to or less than the axial length of the cylinder section.
  • the division of the lower connecting rod section provides the prerequisites for simple assembly of the connecting rod sections and the swivel lever.
  • the two ring parts of the lower connecting rod section are supported on the partial sections of the upper connecting rod section instead of known slide bearings by needle bearings.
  • the bolt is press-fit by the pivot lever and is held in the cylinder section without displacement by means of the pivot lever.
  • 1 is a cylinder, e.g. referred to an internal combustion engine that slidably receives a piston 2.
  • the cylinder 1 is closed at the upper end by a plate-shaped cylinder head 3.
  • the devices for the supply of fuel and air or fuel mixture and the removal of combustion gases are not shown for reasons of clarity.
  • the piston 2 receives, as in particular FIGS. 2 to 6 show a piston pin 32 on which the upper connecting rod section 30 is mounted with its upper bearing 31. Furthermore, the connecting rod section 30 has a cylinder section 33 at the end facing away from the piston 2.
  • the bearing 31 and the cylinder portion 33 are connected to each other by a web 34 'extending symmetrically to the longitudinal central axis of the upper connecting rod portion 30'.
  • ring parts 36 and 36' of a connecting rod 35 connected to its bearing 34 with the crankshaft 11 are supported.
  • the bearing 31, the sections 33 'and 33 ⁇ and the bearing 34 take needle bearings 43.
  • a pivot lever 39 extends, which comprises a pin 40 rotatably guided in the sections 33 'and 33 ⁇ with a press fit and with its other end 39th 'Is supported on a support fixed to the motor housing, for example a pin 41 arranged eccentrically on a rotatably adjustable disk 44.
  • the bolt 40 with its central axis, as shown in the figures, is offset from the central axis of the cylinder section 33 by an extension 27.
  • the design of the connecting rod sections 30 and 35 provides a particularly narrow connecting rod with reduced weight, whereby a favorable mass balance and an advantageous guidance of the crankshaft 11 to the connecting rod can take place.
  • the web 34 'of the upper connecting rod section 30 provides free spaces 45 on both sides, through which crankshaft parts, for example mass balancing weights, can be passed.
  • the pivot lever 39 acts on the connecting rod sections 30 and 35 in the region of the longitudinal center plane, as a result of which tilting moments on the pivot lever 39 and connecting rod sections 30, 35 are avoided.
  • a rotating shaft can also be used as a support member for the pivot lever 39.
  • the lower connecting rod section 35 is formed in the exemplary embodiment by halves 35 ', 35 ⁇ , which are formed by clamping members, e.g. Screws 44 are held together. To avoid protruding ends, depressions 46 are provided for receiving the screw heads 47 and nuts 48 of the clamping members.
  • the piston 2 is at top dead center.
  • the piston pin 32 moves along the cylinder axis 22 and the ring parts 36, 36 'on a movement path in the form of a circular arc 17.
  • the bolt 40 moves on a further circular path 21.
  • the crankshaft 11 rotates and with it the crankshaft-side bearing 34 in the direction of arrow 19.
  • the changes in position of the connecting rod sections 30, 35 and the pivot lever 39 at the bottom dead center of the piston 2 correspond to the dashed lines.
  • the corresponding position of the bearing 34 on the crankshaft side is designated by the letters UT.
  • FIG. 7 shows with the solid line 23 a torque curve in an internal combustion engine of the design according to the invention.
  • the 360 ° of a crankshaft revolution is plotted on the abscissa and the torque value determined for constant piston pressure force is plotted on the ordinate.
  • the dashed line 24 shows the torque curve in a conventional comparison motor. It can be seen that the maximum torque can be achieved with line 23 at approximately 45 ° crankshaft rotation and with the dashed line at approximately 65 ° crankshaft rotation. If one goes with these values in FIG.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transmission Devices (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Harvester Elements (AREA)

Claims (5)

1. Machine motrice ou de travail, en particulier machine à combustion interne, comportant un segment supérieur de bielle et un segment inférieur de bielle entre le piston et le vilebrequin, qui sont reliés l'un à l'autre par une articulation commune, et dans laquelle les deux segments de bielle sont appuyés, par un levier pivotant articulé, à un axe solidaire du carter du moteur, le segment supérieur de bielle (30) présentant symétriquement dans le plan longitudinal médian un corps (34) en forme de barre à tronçon cylindrique (33) agencé à l'extrémité opposée au piston, dont les tronçons partiels (33′ et 33˝) faisant saillie des deux côtés du corps (34) reçoivent des parties annulaires (36, 36′) du segment inférieur de bielle (35) et, dans le tronçon cylindrique (33) dans le plan du corps et dans le segment inférieur de bielle (35) entre les parties annulaires (36, 36′), sont prévus des évidements (38, 38′) qui sont transversalement traversés par un boulon (40) monté excentriquement dans le tronçon cylindrique (33) à distance de l'axe de ce dernier, boulon avec lequel s'engage, à une extrémité, le levier pivotant (39).
2. Machine motrice ou de travail selon la revendication 1, caractérisée en ce que le segment inférieur de bielle (35) est formé, sur une partie de sa longueur, de moitiés (35′, 35˝) reliées l'une à l'autre par des organes de serrage (44), et qui présentent, aux extrémités du côté du piston, à chaque fois une partie annulaire (36, 36′), et en ce que la largeur commune des deux moitiés (35′, 35˝) du segment de bielle est identique à ou plus petite que la longueur axiale du tronçon cylindrique (33).
3. Machine motrice ou de travail selon les revendications 1 et 2, caractérisée en ce que les deux parties annulaires (36, 36′) du segment inférieur de bielle (35) sont appuyées sur les tronquons partiels (33′, 33˝) du segment de bielle supérieur (30) par des paliers à aiguilles (43).
4. Machine motrice ou de travail selon la revendication 1, caractérisée en ce que le boulon (40) est entouré par le levier pivotant (39) avec ajustage serré et est maintenu immobile dans le tronçon cylindrique (33) au moyen du levier pivotant (39).
5. Machine motrice ou de travail selon les revendications 1 et 4, caractérisée en ce que le levier pivotant (39) est monté, par son extrémité opposée au tronçon cylindrique (33), sur un axe (41) ou arbre prévu excentriquement sur un disque rotatif.
EP88905184A 1987-05-08 1988-05-03 Machine motrice ou de travail, notamment machine a combustion interne Expired - Lifetime EP0314773B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88905184T ATE66721T1 (de) 1987-05-08 1988-05-03 Kraft- oder arbeitsmaschine, insbesondere verbrennungskraftmaschine.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3715391 1987-05-08
DE19873715391 DE3715391A1 (de) 1987-05-08 1987-05-08 Brennkraftmaschine oder sonstiger antrieb
DE8711187U 1987-08-17
DE8711187 1987-08-17

Publications (2)

Publication Number Publication Date
EP0314773A1 EP0314773A1 (fr) 1989-05-10
EP0314773B1 true EP0314773B1 (fr) 1991-08-28

Family

ID=25855359

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88905184A Expired - Lifetime EP0314773B1 (fr) 1987-05-08 1988-05-03 Machine motrice ou de travail, notamment machine a combustion interne

Country Status (3)

Country Link
EP (1) EP0314773B1 (fr)
AT (1) ATE66721T1 (fr)
DE (1) DE3864491D1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0292603A1 (fr) * 1987-05-08 1988-11-30 Gerhard Mederer Machines à conversion d'énergie, en particulier un moteur à combustion interne

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0292603A1 (fr) * 1987-05-08 1988-11-30 Gerhard Mederer Machines à conversion d'énergie, en particulier un moteur à combustion interne

Also Published As

Publication number Publication date
EP0314773A1 (fr) 1989-05-10
DE3864491D1 (de) 1991-10-02
ATE66721T1 (de) 1991-09-15

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