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
  • F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
• • 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
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C3/00—Shafts; Axles; Cranks; Eccentrics
  • F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
  • F16C3/06—Crankshafts
  • F16C3/14—Features relating to lubrication
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
  • F01M1/00—Pressure lubrication
  • F01M1/06—Lubricating systems characterised by the provision therein of crankshafts or connecting rods with lubricant passageways, e.g. bores
• • 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
• • 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
• • 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
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C3/00—Shafts; Axles; Cranks; Eccentrics
• • 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
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C3/00—Shafts; Axles; Cranks; Eccentrics
  • F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
  • F16C3/20—Shape of crankshafts or eccentric-shafts having regard to balancing
• • 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
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
  • F16C33/02—Parts of sliding-contact bearings
  • F16C33/04—Brasses; Bushes; Linings
  • F16C33/06—Sliding surface mainly made of metal
  • F16C33/10—Construction relative to lubrication

Definitions

• the present invention relates to a crankshaft for a variable volumetric ratio engine carried by hydrodynamic bearings.
• the mechanical transmission device for a variable volumetric ratio engine comprises at least one cylinder in which a piston moves which is secured in its lower part, a transmission member cooperating on the one hand by means of a small-sized rack with a rolling guide device, and on the other hand by means of another large-sized rack with a toothed wheel integral with a connecting rod, this making it possible to transmit the movement between said piston and said connecting rod.
• the mechanical transmission device for variable volumetric ratio engine also comprises at least one control rack cooperating with the gear wheel, means for fixing the piston on the transmission member which provide a clamping preload, connecting means which allow to stiffen the teeth of the racks, and means for strengthening and lightening the structure of the toothed wheel.
• crankshaft which, as is the case for conventional crankshafts, comprises balancing masses. It is observed that the integral transmission member of the piston and the control rack of the variable volumetric ratio engine have a large width which requires to move the cylinders apart from each other so that the balancing masses of the crankshaft can pass from and other said transmission member and said control rack. As a result of this necessity, the longitudinal dimensions and the weight of the motor are increased significantly. In addition, moving the rolls apart increases the total length of the crankshaft, with the consequence of increasing the boom when it deforms under the effect of the load applied to it.
• crankshaft intended for said variable volumetric ratio engine differs from the prior art in that, according to a particular embodiment of realization:
• crankshaft • The manufacture of the crankshaft is simplified; • The length and weight of the crankshaft are reduced;
• the distance between the various cylinders of the variable compression ratio engine is comparable to the distance between the different cylinders of a conventional engine with a fixed volumetric ratio of the same bore;
• variable compression ratio engine is comparable to that of a conventional engine with a fixed volumetric ratio of the same bore; • Variable compression ratio motor weight is reduced.
• crankshaft for a variable compression ratio engine makes it possible to convert the reciprocating movement of the main moving components of said variable volumetric ratio engine into rotary movement, comprises hydrodynamic bearings and does not have counterbalancing masses.
• the crankshaft for variable compression ratio engine comprises at least one crankpin connected to at least one connecting rod of the variable compression ratio engine on the one hand, and at least two pins and an axial stop bearing arranged in the block. motor of said engine on the other hand.
• crankshaft for variable compression ratio engine comprises hydrodynamic bearings which consist of a smooth cylindrical surface fitted on said crankshaft and which rotate in bearings.
• the crankshaft for variable compression ratio engine comprises hydrodynamic bearings which are lubricated by pressurized oil supplied by ducts formed in the mass of said crankshaft on the one hand, and in the mass of the engine block of somewhere else.
• the crankshaft for variable volumetric ratio engine comprises ducts arranged in the mass of said crankshaft which communicate with orifices opening on each of the surfaces cylindrical smooth which are constituted hydrodynamic bearings of said crankshaft.
• the crankshaft for variable compression ratio engine comprises at least one pulley for driving in rotation the distribution system and the engine peripherals.
• the crankshaft for variable compression ratio engine comprises at least one flywheel for connecting the motor to a gearbox.
• Figure 1 is a perspective view illustrating the variable displacement crankshaft for variable displacement engine carried by hydrodynamic bearings according to the present invention, said crankshaft being connected to the moving components of the variable volumetric ratio engine which are subjected to reciprocating motion.
• Figure 2 is a perspective view showing the crankshaft according to the present invention
• Figure 3 is a sectional view showing the crankshaft according to the present invention.
• FIGS. 1 and 3 show the principal moving components of a variable volumetric ratio engine, among which at least one piston 2 is distinguished, the reciprocating movement of which is converted into rotary motion by means of a transmission device 1.
• Said mechanical transmission device 1 comprises in the lower part of the piston 2 a transmission member 3 secured to said piston which cooperates, on the one hand with a rolling guide device 4, and on the other hand with a toothed wheel 5.
• Said toothed wheel 5 cooperates with a connecting rod 6 connected to a crankshaft 9, object of the present invention, to transmit the work provided by the piston 2 which is reciprocated to said crankshaft 9 which is driven by a rotary movement.
• the toothed wheel 5 cooperates opposite the transmission member 3 with another rack called control rack, not shown whose vertical position relative to the engine block is controlled by a control device comprising a control cylinder.
• crankshaft 9 for a variable compression ratio engine makes it possible to convert the reciprocating movement of the main moving components of the engine constituted by at least one piston 2 and its rotary motion into rotary motion.
• transmission member 3 the toothed wheel 5 connected to its connecting rod 6 and a synchronized roller 40, said synchronized roller 40 forming part of the rolling guide device 4.
• the crankshaft 9 may be made of cast iron or made of steel, it can be cast, forged or entirely machined in the mass of a block of metal.
• the crankshaft 9 comprises at least one crankpin 90 connected to the connecting rod 6 of the variable volumetric ratio engine on the one hand, and at least two journals 91 and an axial stopping bearing, not shown, arranged in the engine block of said engine. somewhere else.
• the crankshaft 9 comprises hydrodynamic bearings which each consist of a smooth cylindrical surface 92 provided on said crankshaft and rotating in bearings, not shown.
• crankshaft 9 for variable volumetric ratio engine is devoid of balancing masses.
• the pads may include a steel back covered with antifriction metal.
• the smooth cylindrical surface 92 which constitutes the hydrodynamic bearings may be nitrided or cemented.
• each hydrodynamic bearing is connected to the arms 93 of the crankshaft 9 by radii or connecting grooves 94.
• the connecting radii or grooves 94 can be made by roller burnishing or by machining.
• the crankshaft 9 comprises hydrodynamic bearings which are lubricated by pressurized oil supplied by conduits 95 formed in the mass of said crankshaft on the one hand, and in the mass of the engine block on the other hand.
• the crankshaft 9 comprises ducts 95 formed in the mass of said crankshaft and which communicate with orifices 96 opening on each of the cylindrical smooth surfaces 92 which are constituted hydrodynamic bearings of said crankshaft.
• the crankshaft 9 for variable compression ratio engine comprises at least one pulley for rotating the distribution and the peripherals of the engine.
• the pulley can incorporate a damper known per se to reduce vibration emissions.
• the crankshaft 9 comprises at least one flywheel for connecting the motor to a gearbox.
• the flywheel may also comprise a ring gear which cooperates with the output gear of an electric starter.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
• Output Control And Ontrol Of Special Type Engine (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=37188999

Family Applications (1)

Country Status (9)

Families Citing this family (9)

Citations (1)

Family Cites Families (15)

• 2006
  • 2006-01-26 FR FR0600711A patent/FR2896553B1/fr not_active Expired - Fee Related
• 2007
  • 2007-01-26 WO PCT/FR2007/000148 patent/WO2007085738A1/fr not_active Ceased
  • 2007-01-26 CA CA002631655A patent/CA2631655A1/fr not_active Abandoned
  • 2007-01-26 KR KR1020087018301A patent/KR20080089445A/ko not_active Withdrawn
  • 2007-01-26 JP JP2008551827A patent/JP2009532602A/ja not_active Withdrawn
  • 2007-01-26 EP EP07730866A patent/EP1977123A1/de not_active Withdrawn
  • 2007-01-26 US US12/160,310 patent/US20100224164A1/en not_active Abandoned
  • 2007-01-26 CN CNA2007800036586A patent/CN101375068A/zh active Pending
  • 2007-01-26 AU AU2007209223A patent/AU2007209223A1/en not_active Abandoned

Patent Citations (1)

Non-Patent Citations (1)

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