Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D15/00—Varying compression ratio
  • F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
• • 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 and not specific to preceding groups
  • F01B9/04—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups 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
  • 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 and not specific to preceding groups
  • F01B9/04—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with rotary main shaft other than crankshaft
  • F01B9/047—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with rotary main shaft other than crankshaft with rack and pinion
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/02—Valve drive
  • F01L1/022—Chain drive
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/12—Transmitting gear between valve drive and valve
  • F01L1/18—Rocking arms or levers
  • F01L1/181—Centre pivot rocking arms
  • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
  • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
  • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
  • F01L9/22—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by rotary motors
• • 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
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
  • F02D29/06—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving electric generators
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/02—Valve drive
  • F01L1/024—Belt drive
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/02—Valve drive
  • F01L1/026—Gear drive
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/20—Adjusting or compensating clearance
  • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
  • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
  • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
• • 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

Definitions

• the present invention relates to an electromechanical device for controlling the compression ratio of a variable volumetric ratio engine. It is known from international patents WO98 / 51911, WO00 / 31377, WO03 / 008783 belonging to the applicant, various mechanical devices for variable volumetric ratio engine.
• 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.
• the holding in vertical position of said control rack and its displacement to another vertical position are provided by a control cylinder.
• the cylinder comprises a lower chamber and an upper chamber whose cylinder capacity is maintained identical to that of said lower chamber through a cylinder axis extension also called upper cylinder rod.
• the control cylinder also includes a cylinder piston, valves held in place by springs and a control rod. The upper end of said cylinder is closed by a cylinder head. It is noted that according to the international patent WO 98/51911 in the name of the applicant, the vertical position of the control rod can be modified by low power electrical means which can print to said control rod a vertical translational movement allowing open or close the control cylinder valves so that it automatically moves to the same vertical position as the control rod.
• the invention comprises according to a particular embodiment of a device electromechanical device for controlling the compression ratio of a variable volumetric ratio engine.
• the electromechanical device comprises mechanical means for transmitting motion between at least one electric motor and at least one control rod of a control jack of a control device for adjusting the vertical position of a rack controlling said variable compression ratio engine.
• the electromechanical device comprises mechanical means for transmitting motion between at least one electric motor and at least one control rod which consist of at least one camshaft which comprises at least one cam.
• the electromechanical device comprises a camshaft which is positioned above the cylinder head of the cylinder (s) for controlling the engine.
• the electromechanical device comprises a camshaft which is positioned below the engine control jack (s), inside the engine block of said engine.
• the electromechanical device comprises a camshaft which includes a sensor for informing the engine management system on the angular position of said camshaft.
• the electromechanical device according to the present invention comprises a camshaft which has a return spring in rotation.
• the electromechanical device according to the present invention comprises a camshaft which is connected to the electric motor by intermediate transmission means.
• the electromechanical device according to the present invention comprises a camshaft which is positioned in the longitudinal axis of the control rod (s) of the control ram (s) and perpendicular to said axis, and acts on the vertical position. of said control rod (s) via at least one pusher.
• the electromechanical device comprises a pusher which comprises an adjustment device which makes it possible to fix the initial vertical position of at least one control rod with respect to the initial vertical position of the other rod (s). engine control.
• the electromechanical device comprises an adjustment device, which comprises the pusher, which consists of a thread that can be stopped in rotation.
• the electromechanical device according to the present invention comprises a camshaft whose position is offset relative to that of the control rod (s) or (s) control cylinder (s), said camshaft to adjust the position vertical of said engine control rod (s) via at least one rocker arm.
• the electromechanical device comprises a rocker arm which has a hinge close to its center allowing it to pivot relative to the engine, one end of said rocker cooperating with at least one cam of the camshaft to adjust the angular position of said rocker arm, while the other end of said rocker arm cooperates with at least one control rod to adjust the vertical position of said control rod.
• the electromechanical device comprises a rocker arm whose articulation located near the center of said rocker arm allows said rocker arm to pivot with respect to the motor, said articulation comprising an adjustment device which makes it possible to fix the initial vertical position of at least a control rod relative to the initial vertical position of the other or the other engine control rod (s).
• the electromechanical device according to the present invention comprises an adjusting device, which comprises the joint arranged near the center of the rocker arm, which consists of a thread which can be stopped in rotation.
• the electromechanical device comprises a rocker arm which comprises at its end a hinge allowing it to pivot relative to the motor on the one hand, and a surface formed near its center cooperating with at least one cam of the shaft to cams for adjusting the angular position of said rocker arm on the other hand, the other end of said rocker cooperating with at least one control rod for adjusting the vertical position of said control rod.
• the electromechanical device according to the present invention comprises a hinge, which comprises the rocker arm at its end and which allows said rocker arm to pivot relative to the engine, which comprises an adjustment device which makes it possible to fix the initial vertical position of at least one rod to control the initial vertical position of the other engine control rod (s).
• the electromechanical device comprises an adjusting device, which comprises the joint arranged at the end of the rocker arm, which consists of a thread which can be stopped in rotation.
• the electromechanical device comprises an electric motor which includes a sensor for informing the engine management system on the angular position of said electric motor.
• the electromechanical device comprises a motor which comprises as many electric motors as control rods, said control rods each having their own electric motor to adjust their vertical position.
• the electromechanical device comprises mechanical means for transmitting motion between at least one electric motor and at least one control rod which consist of at least one geared wheel shaft which comprises at least one toothed wheel co-operating with a rack of very small dimension mounted at the end of at least one control rod of the engine.
• the electromechanical device comprises intermediate transmission means for connecting the gearwheel shaft to the electric motor.
• the electromechanical device comprises a rack of very small size which comprises an adjusting device which makes it possible to fix the initial vertical position of at least one control rod with respect to the initial vertical position of the other one or the others. engine control rod (s).
• the electromechanical device comprises an adjustment device, which comprises the rack of very small size, which consists of a thread which can be stopped in rotation.
• the electromechanical device comprises a control rod which has two small-diameter shoulders for lifting two small-diameter valves located respectively in the upper and lower chambers of the control cylinder, said control rod also comprising two shoulders of large diameter that can raise two large diameter valves also located respectively in the upper and lower chambers of the control cylinder, said shoulders being positioned so that the small diameter valves are always opened by the control rod before the large diameter valves.
• the electromechanical device comprises small diameter valves which comprise in their center a bore through which the control rod passes, and a spherical contact zone which cooperates with a conical contact zone arranged in the large diameter valves.
• the electromechanical device comprises small diameter valves which are kept in contact with the large diameter valves housed in the same chamber by means of springs coming to bear on said small diameter valves on the one hand, and on the wall of the chamber of the control cylinder in which they are housed on the other hand, said springs also allowing to maintain the large diameter valves in contact with the piston of the control cylinder.
• the electromechanical device comprises small diameter valves which are kept in contact with the large diameter valves housed in the same chamber by means of at least one spring fixed on the jack piston and coming to bear on said valves. small diameter, said spring also to maintain the large diameter valves in contact with the piston of the control cylinder.
• the electromechanical device according to the present invention comprises large-diameter valves which comprise a smooth annular surface that can be kept in contact with a smooth face provided respectively on the upper and lower faces of the piston of the control jack in order to seal with said piston. .
• the electromechanical device according to the present invention comprises large diameter valves which comprise means which keep them always centered on the control rod along their longitudinal axis.
• the electromechanical device comprises at least one engine control rod which comprises at least one sensor for informing the engine management system on the vertical position of said rod.
• the electromechanical device comprises at least one motor control rack which comprises at least one sensor for informing the engine management system on the vertical position of said rack.
• Figures 1 and 2 are perspective views illustrating an electromechanical device according to the present invention for controlling the compression ratio of a variable volumetric ratio engine.
• Figure 3 is a schematic view showing a first variant of the electromechanical device according to the present invention.
• Figure 4 is a schematic view illustrating a second variant of the electromechanical device according to the present invention.
• Figure 5 is a schematic view showing a third variant of the electromechanical device according to the present invention.
• Figures 6 and 7 are views showing a control device of a variable volumetric ratio engine according to the present invention.
• FIGS. 1 and 2 show an electromechanical device 800 for controlling the compression ratio of a variable volumetric ratio engine comprising for each cylinder a transmission device 1 and a piston 2.
• the mechanical transmission device 1 comprises in the lower part of the piston 2 a transmission member 3 secured to said piston and cooperating, on the one hand with a rolling guide device 4, and on the other hand with a toothed wheel 5.
• the toothed wheel 5 cooperates with a connecting rod 6 connected to a crankshaft 9 in order to carry out the transmission of the movement between the piston 2 and said crankshaft 9.
• the toothed wheel 5 cooperates opposite the transmission member 3 with another rack called control rack 7 whose vertical position relative to the engine block is controlled by a control device 12.
• the control device 12 of the engine variable volumetric ratio comprises a control cylinder 8 which consists of an upper cylinder rod 10, a lower cylinder rod 16, a piston cylinder 13 and a control rod 20.
• the electromechanical device 800 comprises mechanical means for transmitting the movement 801 between at least one electric motor 802 and at least one control rod 20 of a control device 12 for adjusting the vertical position of the control rack 7 of said motor.
• variable volumetric ratio The electric motor 802 may be, for example, a stepper motor, a servomotor or a linear motor.
• the electromechanical device 800 comprises an electric motor 802 which includes a sensor for informing the engine management system on the angular position of said electric motor.
• the electromechanical device 800 comprises as many electric motors 802 as control rods 20, said control rods each having their own electric motor to adjust their vertical position.
• the electromechanical device 800 comprises mechanical transmission means 801 which consist of at least one camshaft 803 which comprises at least one cam 804.
• the camshaft 803 can be, for example, mounted on bearings or on bearings. bearings, not shown.
• cam 803 of camshaft 803 may be any or, for example, spiral to provide a constant relationship between the angular displacement of camshaft 803 and the linear displacement of the member. who is in contact with the cam.
• the electromechanical device 800 may comprise a camshaft 803 which is positioned above the cylinder head of the control cylinder (s) 8 of the control device 12 of the engine.
• the electromechanical device 800 may comprise a camshaft 803 which is positioned below the control jack (s) 8 of the control device 12 of the engine and inside the engine block of said engine.
• the electromechanical device 800 comprises a camshaft 803 which includes a sensor for informing the engine management system on the angular position of said camshaft.
• the electromechanical device 800 comprises a camshaft 803 which comprises a spring 805 of return rotation.
• the spring 805 may be, for example, a torsion spring consisting of a wire wound in a cylindrical shape or a spiral spring consisting of a spirally wound steel sheet.
• the electromechanical device 800 comprises a camshaft 803 which is connected to the electric motor 802 by intermediate transmission means 806.
• the intermediate transmission means 806 may consist, for example, of a toothed wheel 807 which cooperates with a screw without late 808.
• the intermediate transmission means 806 may consist, for example, of a gear system comprising at least two toothed wheels, or gears connected together by a chain or toothed pulleys interconnected by a belt. notched.
• FIG. 1, 2 and 4 show the electromechanical device 800 according to the present invention comprising a camshaft 803 whose position is offset relative to that of the control rod or rods 20 of the jack or cylinders (FIG. s) 8.
• the camshaft 803 makes it possible to adjust the vertical position of the at least one control rod (s) 20 of the motor by means of at least one rocker 810 and 813.
• the rocker 810 and 813 can be made for example in foundry, forged steel or stamped sheet.
• Each rocker 810 has a hinge 811 provided near its center allowing it to pivot relative to the engine.
• One of the ends of the rocker arm 810 cooperates with at least one cam 804 of the camshaft 803 to adjust the angular position of said rocker arm, while the other end of said rocker arm cooperates with at least one control rod 20 to adjust the vertical position of said control rod.
• hinge 811 provided near the center of the rocker 810 may be, for example, a ball joint or a pivot connection.
• the hinge 811 which each rocker arm 810 comprises near its center, comprises an adjusting device 812 which makes it possible to fix the initial vertical position of at least one control rod 20 of a control cylinder 8 relative to in the initial vertical position of the other or other control rod (s) 20 of the other or the other control cylinder (s) 8 of the engine.
• the adjustment device 812 that includes the hinge 811 arranged near the center of each rocker arm 810, consists of a thread which can be stopped in rotation, for example, against a nut, by gluing, by keying or by a "Nylstop" type brake.
• FIG. 3 shows the electromechanical device 800 according to the present invention comprising a camshaft 803 which is positioned in the longitudinal axis of the control rod (s) 20 of the control jack (s) 8 and perpendicular to said axis, and acts on the vertical position of said control rod (s) 20 via at least one pusher 809.
• the pusher 809 has an adjustment device which makes it possible to fix the initial vertical position of at least one control rod 20 with respect to the initial vertical position of the other one or more control rods 20 of each cylinder. motor control 8.
• the adjustment device which comprises the pusher 809, consists of a thread that can be stopped in rotation, for example, by a lock nut, by gluing, by keying or by a "Nylstop" type brake.
• FIG. 4 shows the electromechanical device 800 according to the present invention comprising a rocker arm 813 which comprises at one of its ends a hinge 814 allowing it to pivot relative to the engine on the one hand, and a surface 815 arranged nearby. its center and cooperating with at least one cam 804 of the camshaft 803 to adjust the angular position of said rocker 813 secondly.
• the other end of said rocker 813 is provided to cooperate with at least one control rod 20 of the control cylinders 8 to adjust the vertical position of said control rod.
• the hinge 814 that includes the rocker 813 at its end may be, for example, a ball joint or a pivot connection.
• the hinge 814 which includes the rocker 813 at its end and which allows said rocker arm to pivot relative to the engine, comprises an adjusting device 816 for fixing the initial vertical position of at least one control rod 20 relative to the initial vertical position of the other one or more control rods 20 of the engine.
• the adjusting device 816 which comprises the hinge 814 arranged at the end of the rocker 813, consists of a thread which can be stopped in rotation, for example, by a lock nut, by gluing, by keying or by a "Nylstop" type brake.
• FIG. 5 illustrates the electromechanical device 800 according to the present invention comprising mechanical means for transmitting the movement 801 between at least one electric motor 802 and at least one control rod 20.
• the mechanical transmission means of the movement 801 consist of at least one geared wheel 817 which comprises at least one toothed wheel 818 cooperating with a very small rack 819 mounted at the end of at least one control rod 20 of the engine.
• the geared wheel 817 may be, for example, mounted on bearings or not shown bearings.
• the geared wheel 817 may be, for example, mounted on bearings or not shown bearings.
• the electromechanical device 800 comprises a geared wheel shaft 817 which is connected to the electric motor 802 by intermediate transmission means 806.
• the intermediate transmission means 806 may consist, for example, of a toothed wheel 807 which cooperates with a worm 808 or of a gear system comprising at least two toothed wheels, toothed wheels connected together by a chain or toothed pulleys interconnected by a toothed belt.
• the rack of very small size 819 comprises an adjusting device for fixing the initial vertical position of at least one control rod 20 relative to the initial vertical position of the other or the other control rod (s) 20 of the engine.
• the adjustment device which comprises the rack of very small size 819, consists of a thread which can be stopped in rotation, for example, by a lock nut, by gluing, by keying or by a type of brake "Nylstop ".
• the electromechanical device 800 comprises either at least one pusher 809, at least one rocker 810, 813, or at least a very small rack 819, the adjustment of the initial vertical position of the control rods 20 of the engine relative to each other is performed during the assembly of the engine.
• the adjustment of the initial vertical position of the control rods 20 during the assembly of the engine is carried out either by measuring the altitude of the pistons 2 of the engine at the top dead center by means of a comparator or any other measuring instrument installed. in the spark plug well, either by measuring the volume of the combustion chambers of said engine when the pistons 2 of said engine are at top dead center.
• the device for adjusting the initial vertical position of the control rods 20 of the engine relative to each other may consist of an electric motor.
• each electric motor can be, for example, a linear piezoelectric motor.
• the adjustment of the initial vertical position of the engine control rods relative to each other can be effected by the engine running, or by measuring the effective pressure in the combustion chambers of the engine by means of appropriate sensors. or by deducing the effective pressure in the combustion chambers of the engine from the pressure measured in the upper chamber of the engine control cylinders by means of at least one pressure sensor.
• FIGS. 6 and 7 show a control device 12 of the variable volumetric ratio engine comprising a control cylinder 8 which consists of an upper cylinder rod 10, a lower cylinder rod 16, a piston of cylinder 13 and a control rod 20.
• the jack piston 13 comprises a peripheral swivel ring 180 which matches the spherical shape of said jack piston.
• the upper cylinder rod 10 has in its inner part and in its center a non-return valve 185 of leak compensation whose input is in communication with a chamber 184 formed in the cylinder head 300 of the control cylinder 8.
• the control rod 20 of the control jack 8 of the electromechanical device 800 has two shoulders 23 of small diameter for lifting two small diameter valves 21 located respectively in the upper chambers 121 and lower 122 of the control jack 8.
• the control rod 20 also comprises two shoulders 24 of large diameter which make it possible to lift two large diameter valves 25 which are also respectively in the upper chambers 121 and lower 122 of the control jack 8.
• the shoulders 23 of small diameter and the shoulders 24 of large diameter are positioned so that small diameter valves 21 are always open by the control rod 20 before the valves 25 of large diameter.
• the small diameter valves 21 comprise in their center a bore through which the control rod 20 passes, and a spherical contact zone 26 which cooperates with a conical contact zone 27 arranged in the large diameter valves 25.
• the bore formed in the center of the valves 21 of small diameter and which is traversed by the control rod 20 may comprise a groove containing a seal 28 can be toric elastic material, or in two parts one annular directly in contact with the control rod 20 and which has particular characteristics of wear resistance, and the other ring which has particular characteristics of elasticity and sealing and which always remains in contact with the bottom of said throat.
• valves 21 of small diameter can be made in two parts which are assembled by shrinking, gluing or crimping after assembly of the gasket.
• the small diameter valves 21 are held in contact with the large diameter valves 25 housed in the same chamber by means of springs 22 bearing on said small diameter valves 21 and on the wall of the chamber 121. , 122 of the control cylinder 8 in which they are housed on the other hand, said springs 22 also making it possible to keep the large diameter valves 25 in contact with the piston of the jack 13 of the control jack 8.
• the springs 22 may be, for example, of helical type and be mounted coaxially with the control rod 20.
• the small diameter valves 21 are held in contact with the large diameter valves 25 housed in the same chamber 121, 122 by means of at least one spring fixed on the piston cylinder 13 and coming to bear on said valves of small diameter, said spring also making it possible to maintain the large diameter valves 25 in contact with the jack piston 13 of the control jack 8.
• the spring fixed on the jack piston 13 may consist of a sheet of steel of suitable shape or may be a torsion spring consisting of a winding of steel wire.
• the large diameter valves 25 have a smooth annular surface 29 that can be kept in contact with a smooth face respectively arranged on the upper and lower faces of the piston of the cylinder 13 of the control cylinder 8 to seal with said piston.
• the large diameter valves 25 have centering means which keep them always centered on the control rod 20 along their longitudinal axis.
• the centering means which ensure the centering of large diameter valves on the control rod 20 leave sufficient radial mobility to said large diameter valves 25 so that the seal between said valves and the piston of the cylinder 13 of the control cylinder 8 is always achieved regardless of the orientation of said piston relative to the engine.
• the electromechanical device 800 comprises at least one control rod 20 which comprises at least one sensor for informing the engine management system on the vertical position of said rod.
• the electromechanical device 800 comprises at least one control rack 7 which comprises at least one sensor for informing the engine management system on the vertical position of said rack.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Output Control And Ontrol Of Special Type Engine (AREA)
• Valve Device For Special Equipments (AREA)
• Transmission Devices (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=36616980

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Family Cites Families (12)

• 2006
  • 2006-01-26 FR FR0600708A patent/FR2896538B1/fr not_active Expired - Fee Related
• 2007
  • 2007-01-26 US US12/160,212 patent/US8104437B2/en active Active
  • 2007-01-26 WO PCT/FR2007/000147 patent/WO2007085737A2/fr active Application Filing
  • 2007-01-26 EP EP07730865A patent/EP1979595B1/de not_active Not-in-force
  • 2007-01-26 KR KR1020087018299A patent/KR101257976B1/ko active IP Right Grant
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  • 2007-01-26 AU AU2007209222A patent/AU2007209222B2/en not_active Ceased
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