EP2764217A2 - Elektrohydraulisches ventilstellglied mit alternierendem nocken - Google Patents

Elektrohydraulisches ventilstellglied mit alternierendem nocken

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Publication number
EP2764217A2
EP2764217A2 EP12787763.7A EP12787763A EP2764217A2 EP 2764217 A2 EP2764217 A2 EP 2764217A2 EP 12787763 A EP12787763 A EP 12787763A EP 2764217 A2 EP2764217 A2 EP 2764217A2
Authority
EP
European Patent Office
Prior art keywords
valve
actuator
hydraulic
cylinder
electro
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.)
Withdrawn
Application number
EP12787763.7A
Other languages
English (en)
French (fr)
Inventor
Vianney Rabhi
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
Application filed by Individual filed Critical Individual
Publication of EP2764217A2 publication Critical patent/EP2764217A2/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/044—Reciprocating cams
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • 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
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F01L2013/0068—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/033—Hydraulic engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0253—Fully variable control of valve lift and timing using camless actuation systems such as hydraulic, pneumatic or electromagnetic actuators, e.g. solenoid valves

Definitions

  • the present invention relates to an electrohydraulic valve actuator with jack and reciprocating cam for an internal combustion engine.
  • the intake and exhaust valves of the reciprocating internal combustion engines open when the crankshaft of said engines reaches a certain angular position. This results from the ordinarily invariable angular position of the camshaft or camshafts of said engines relative to that of said crankshaft, the latter position being considered in 360 degrees on 2-stroke engines and su r 720 deg res sur r the moteu rs 4- times as imagined by Messrs. Nikolaus Otto and Alphonse Euffer Beau de Rochas. To make variable the moment when said valves open relative to the angular position of said crankshaft, the modern gasoline engines comprise at least one intake camshaft dephaser and, more and more often, a shaft phase shifter exhaust cams. These phase shifters are generally electro-hydraulic, sometimes electric, and allow to vary the angular position of said shafts relative to that of said crankshaft.
  • the parameters of opening time, opening speed, and valve lift height are permanently set by the profile of the cams that actuate said valves. Making these variable parameters is of great interest because of their high impact on cylinder filling and on the quality of combustion.
  • the variability of said parameters is a source of significant improvement in the energy performance of the engines and in controlling the polluting emissions of said engines. Said variability makes it possible in particular:
  • the first of these strategies is to close the intake valve early during the intake stroke of said engine, the intake duct being maintained at a pressure close to atmospheric pressure during said stroke, so that trapping in the cylinder of said engine the desired air or fuel mixture charge, then relax this air or mixture to the bottom dead center of the piston of said engine before re-compressing said air or mixture in the combustion chamber until at the top dead center of said piston.
  • the second strategy consists in closing the intake valve late during the compression stroke of the engine, the intake duct being maintained at a pressure close to atmospheric pressure during said stroke, a maximum air or fuel mixture being introduced into the engine. cylinder during the intake stroke of the engine, and then said load being partially discharged into said duct during the compression stroke until the charge remaining in the cylinder corresponds to the desired load, when the intake valve is closed again .
  • This last strategy operates an Atkinson cycle - more efficient with partial loads than that of Otto or Beau de Rochas - and finds all its interest on engines with variable compression ratio.
  • Said control also makes it possible to regulate the swirling or "swirl" movement of the air or gases commonly used in diesel engines, said movement being able, for example, to be adjusted by shifting the opening point of the two intake valves of a same cylinder;
  • Increasing the residual flue gas rate can also be achieved by early opening the intake valve to store flue gases in the intake duct before reintroducing them into the cylinder during the intake stroke of said engine.
  • increase the rate of flue gas Residuals can also be obtained by closing the exhaust valve early to trap exhaust gases in the cylinder before opening the intake valve. It is noted that the recycling of the exhaust gases of the preceding cycle in the current cycle is also a strategy which makes it possible to reduce the polluting emissions and particularly the nitrogen oxides of diesel engines;
  • camshaft dephasers are industrialized and tend to generalize, but they do not control the duration of opening n i the lift height of said valves.
  • phase shifters are more and more often associated with devices making the lift height of said valves variable.
  • continuously variable valve lift variators is the “Valvetronic ®” developed by BMW and based on a variable ratio lever, or the “Multiair ®” from FIAT, which provides a hydraulic transmission between the cam and the valve plunger with a solenoid valve back to the reservoir of the hydraulic fluid used to truncate more or less the lifting of said valve.
  • variable valve lift devices are most commonly applied to intake valves and in rare cases to exhaust valves. These devices generally equip only one of the camshafts of the motor, either ad u ission ad ission, or cet uid ec ditement, mainly for reasons of cost and / or congestion. It is noted that when they equip mass-produced passenger vehicles, these devices are always dependent on at least one cams and therefore, that their benefits depend directly on the profile of the cams that includes said tree.
  • camless devices These latter devices can in theory apply any law of opening, lifting and closing of the valves, within the limits allowed by physics and geometry.
  • camless devices in the prototype state such as the "electro-magnetic camless” of the company Valéo, the “Free Valve” of the company Cargine, the hydroelectric device is developed by the American company Sturman in collaboration with Siemens or the Active Valve Train (AVT TM) from Lotus.
  • At least one hydraulic cylinder connected to a high-pressure hydraulic circuit by a conduit, and ensuring the opening of at least one valve; at least one volumetric hydraulic pump comprising at least one output and at least one input, and whose rotational speed is proportional to that of the crankshaft of the engine; at least one pump outlet shutter which makes it possible to prevent the hydraulic fluid expelled at the outlet of the positive displacement hydraulic pump from opening into a low pressure circuit or into a tank, and to force it to move towards a high pressure circuit communicating with one or more hydraulic cylinder (s) ensuring the opening of one or more valve (s); at least one valve opening selector which makes it possible to direct, via the high-pressure circuit, the hydraulic fluid expelled at the outlet of the positive displacement hydraulic pump towards the hydraulic jack of at least one valve to be opened, while preventing said hydraulic fluid from being be directed to one or more other valve (s) to remain closed (s); at least one opening check valve placed on the high pressure circuit between the pump outlet and the hydraulic cylinder of at least one valve for retaining the hydraulic fluid in said hydraulic
  • At least one valve closing selector that directs the hydraulic fluid contained in the hydraulic cylinder of at least one valve held open by the opening non-return valve to the inlet or the inlet of the pump volumetric hydraulic system to ensure the closing of said valve (s), and to prevent the hydraulic fluid contained in their hydraulic jack from being introduced into the cylinder hydraulic of another or other valve (s) to remain in closed position;
  • At least one pump inlet check valve which allows the hydraulic fluid of the low pressure circuit or tank to be admitted to the inlet or the inlets of the positive displacement hydraulic pump when the pressure of said low pressure circuit or said tank is greater than that of said inlet (s) of the positive displacement hydraulic pump.
  • the actuator has a certain complexity of realization because of the multitude of precise parts of which it is constituted, said complexity and said parts potentially leading to a high cost price of said actuator;
  • the actuator requires precise electric motors to proportionally control the position of its lifting, opening, and valve closing (s) forks. These complex engines are potentially expensive.
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam for an internal combustion engine according to the invention differs from the valve drive devices known from the prior art in that it inherits the advantages of the hydraulic actuator. of valves for an internal combustion engine described in the international patent WO 2004/01 1780 belonging to the applicant, but eliminates the disadvantages and pushes the im limits functional via a real isation mode and used means which are radically different.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for an internal combustion engine comprises:
  • At least one hydraulic actuator valve actuator which comprises at least one valve actuator piston which opens at least one valve of an internal combustion engine or a piston compressor (s) when said cylinder is connected by a valve opening solenoid valve with at least one incoming high pressure hydraulic circuit, said cylinder closing said valve when it is connected by a valve closing solenoid valve with at least one outgoing high pressure circuit, and said cylinder ensuring the opening maintenance of said valve when it is connected neither with the circuit incoming high pressure, nor with the outgoing high pressure circuit; at least one volumetric hydraulic pump comprising at least one output connected to a low pressure circuit connected to at least one low pressure reservoir and at least one input connected to said low pressure circuit, said pump rotating at a speed proportional to that of a crankshaft of the internal combustion engine ;
  • At least one high pressure valve opening pipe connecting the output of the positive displacement hydraulic pump with the high pressure hydraulic circuit entering the hydraulic actuator valve actuator;
  • At least one high-pressure valve closing line connecting the inlet of the positive displacement hydraulic pump with the high-pressure hydraulic circuit coming out of the hydraulic actuator valve actuator;
  • At least one pump outlet shut-off solenoid valve which can prevent the hydraulic fluid expelled at the output of the positive displacement hydraulic pump from returning to the low pressure hydraulic circuit, so that said fluid is forced into the high pressure line; valve opening;
  • At least one pump inlet check valve which prevents the hydraulic fluid from the valve actuator hydraulic cylinder via the high pressure valve closing line from returning directly into the low pressure hydraulic circuit, so that said fluid is forced at the inlet of the volumetric hydraulic pump, but said valve allowing said pump to suck said fluid contained in the low pressure hydraulic circuit, when the pressure of the latter is greater than the pressure prevailing in the high pressure closing duct; valve; At least one valve opening cam connected firstly to the hydraulic actuator valve actuator by a mechanical transmission, and secondly to the valve of the internal combustion engine directly or via an intermediate transmission said cam moving in one direction during the opening maneuvers of said valve, then in opposite direction during closing operations of said valve;
  • At least one return spring of the valve opening cam which tends to return said cam to the position it has when the valve of the internal combustion engine is closed;
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a valve actuator hydraulic cylinder which is rotatable and a valve actuator piston which has a pallet shape, said piston separating at least a high pressure chamber of at least one low pressure chamber so that the pressure of the hydraulic fluid can rotate said piston which is rotatably connected directly or indirectly to the valve opening cam.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a valve actuator piston which can move in a cylinder and push on a guided valve opening rack in a cylinder head comprises the internal combustion engine or the piston compressor (s), said rack cooperating with a pinion arranged around an axis of the valve opening cam so as to drive said cam in rotation when said piston moves in translation longitudinal.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for an internal combustion engine according to the present invention comprises a valve opening rack which is guided in the cylinder head of the internal combustion engine by means of at least one compression bearing. balls or rollers.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a valve actuator piston moving in a cylinder and pushing a rod. valve opening with one of the ends of which it is articulated, said rod in turn pushing on a cam arm that directly or indirectly comprises the valve opening cam with which the other end of said stem is also articulated so as to drive said cam in rotation when said piston moves in longitudinal translation.
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam for an internal combustion engine comprises a valve opening rod which is articulated to at least one of its two ends by means of a ball joint. open or closed.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for an internal combustion engine comprises a volumetric hydraulic pump comprising a plurality of compartments which each constitute an autonomous pump comprising at least one inlet and at least one outlet connected to at least one a hydraulic actuator valve actuator, said autonomous pumps being rotated by the same shaft and being housed in the same housing.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine according to the present invention comprises a position sensor on the valve of the internal combustion engine.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a cam angular position sensor on the valve opening cam.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a valve opening cam which cooperates with a cam stop limiting the maximum angular position of said cam when the valve of the internal combustion engine actuated by said cam is closed.
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam for an internal combustion engine comprises a cam stop which is mounted on a shock absorber or which comprises a shock absorber limiting the acoustic emissions when said cam comes into contact with the cam stop.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a valve opening cam which has two open or closed hinges and a lever cam contact surface, the first articulation being secured to the internal combustion engine while the second is connected to the valve actuator piston directly by a piston flap or indirectly by a push rod and said cam can roll and / or slip on a fitted rocker contact surface on a tilting latch hinged at one of its ends around at least one integral latch anchor of said motor, and provided at its other end with at least one pawl flap that can push directly or indirectly on a tail of at least one valve of said motor for opening said valve.
  • the electro-hydraulic valve actuator with jack and reciprocating cam for an internal combustion engine comprises a ball joint on at least one of the two open or closed joints.
  • the actuator of electro-hydraulic valve with cylinder and reciprocating cam for internal combustion engine comprises a push rod which is articulated at each of its ends by a ball joint connection, the first ball joint being arranged in or at the end of the valve actuator piston while the second ball joint connection is arranged in or on the valve opening cam.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a valve opening cam having a lever cam contact surface and is rotated by means of least one rotational arm whose one end is integral with the axis of said cam while its other end is articulated by means of a pivot connection or ball joint with the first end of an arm push rod, the second end of said rod being articulated by means of a pivot connection or ball joint with the valve actuator piston and said cam being able to roll and / or slide on a tilting contact surface fitted on a rocker arm articulated to one of its ends around at least one pawl anchor integral with the internal combustion engine, and provided at its other end with at least one pawl flap that can push directly or indirectly on a tail that includes at least one valve of said engine to open said valve.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a valve actuator piston which moves in a cylinder provided with a piston end damping light, said light being completely or partially blocked by said piston when said piston reaches the vicinity of the position it has when the valve of the internal combustion engine that it actuates is closed.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine according to the present invention comprises a valve actuator piston which moves in a cylinder provided with a piston end stop which limits the depth of the piston. introducing said piston into said cylinder.
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam for an internal combustion engine according to the present invention comprises a low pressure reservoir which consists of at least one compensation pressure accumulator maintained under pressure by at least one replenishing pump. which supplies said accumulator with hydraulic fluid by sucking said fluid into at least one replenishing tank.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for an internal combustion engine comprises a valve opening solenoid valve and / or valve closing solenoid valve and / or pump outlet solenoid valve which is a tube solenoid valve consisting of at least one rectilinear tube capable of moving in longitudinal translation in a valve housing comprising an upper chamber and a lower chamber, said rectilinear tube having a first end terminating in the upper chamber and a second end opening into the lower chamber, said second end being able to come into contact with at least one sealing surface integral with said valve housing so as to seal as tight as possible said second end.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for an internal combustion engine according to the present invention comprises a tube solenoid valve having sealing means between the outer surface of the straight tube and the valve housing which isolate the upper chamber of the lower lower chamber.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for an internal combustion engine according to the present invention comprises a tube solenoid valve comprising at least one closing spring which tends to keep the rectilinear tube in contact with the sealing surface. .
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam for an internal combustion engine according to the present invention comprises a tube solenoid valve comprising at least one electric actuator capable of applying to the rectilinear tube a force that is antagonistic to that produced by the spring. shutter, said force being sufficient to detach the rectilinear tube from the sealing surface when said actuator is traversed by an electric current.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a tube solenoid valve whose electric actuator consists of a coil of conductive wire which attracts a magnetic core or paddle when said coil is crossed by an electric current.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for an internal combustion engine comprises an electric actuator whose core or magnetic paddle is housed in the upper chamber.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for an internal combustion engine according to the present invention comprises an electric actuator whose coil of conductive wire is accommodated in the upper chamber.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine according to the present invention comprises an electric actuator whose coil of conductive wire is housed outside the upper chamber, the magnetic field generated by said coil when traversed by an electric current passing through the outer wall of said chamber so as to exert a force on the core or magnetic paddle.
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam for an internal combustion engine according to the present invention comprises a tube solenoid valve whose first end of the rectilinear tube is integral with the core or magnetic paddle.
  • the electro-hydraulic valve actuator with jack and reciprocating cam for an internal combustion engine according to the present invention comprises a rectilinear tube whose first end comprises at least one radial and / or axial orifice opening into the upper chamber.
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam for an internal combustion engine according to the present invention comprises a rectilinear tube whose second end is troncospheric and has a line of contact with the closure surface similar to that achieved by a ball bearing on a seat.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a sealing surface which is arranged on an independent piece mounted floating in the valve housing, said part being able to align with the rectilinear tube when the second end of said tube comes into contact with said surface.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for an internal combustion engine according to the present invention comprises a valve housing having directly or indirectly via an intermediate plug a vented orifice which is closed by the independent room on which is fitted the sealing surface.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for an internal combustion engine according to the present invention comprises a valve housing which is fixed to the internal combustion engine and which has orifices and / or inlet ducts. outlet connecting the upper chamber and / or the lower chamber either with the valve actuator hydraulic cylinder or with the hydraulic pump volumetric via the incoming high pressure hydraulic circuit, the outgoing high pressure circuit or the low pressure hydraulic circuit.
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam for an internal combustion engine comprises a straight tube whose section at the level of the seal that said tube constitutes with the valve housing is slightly smaller than the section of said tube at its contact with the sealing surface.
  • the electro-hydraulic valve actuator with jack and reciprocating cam for an internal combustion engine comprises a solenoid valve with a tube whose sealing means consist of the external surface of the rectilinear tube which cooperates with the internal one of the crankcase. valve.
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam for an internal combustion engine comprises a tube solenoid valve provided with an adjustable stop or not which is arranged on the rectilinear tube and which cooperates with a surface of axial stop arranged directly or indirectly in the valve housing, said stop determining the maximum distance between said tube and the sealing surface with which it cooperates.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine according to the present invention comprises a valve housing which can accommodate a plurality of solenoid valves with a tube.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a replenishing pump comprising a replenishing piston which can perform back and forth movements in a blind cylinder. arranged in a blind cylinder housing so as to define a variable volume inside said cylinder, said piston also cooperating with a replenishment inlet valve and a replenishment outlet valve, whose outlet and inlet respectively open in said volume, said inlet valve admitting hydraulic fluid from the replenishing tank while said outlet valve expels said fluid into the compensation pressure accumulator or the replenishing pressure accumulator.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a replenishing pump whose replenishing piston is actuated in translation in a first direction by an electric solenoid actuator mainly consisting of a magnetic replenishing core, a coil of conductive wire and a magnetic resupply cage, and in a second direction by a return spring of the replenishing piston.
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam for an internal combustion engine according to the present invention comprises a replenishing pump whose blind cylinder case is made in the same metal part as the magnetic replenishment cage.
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam for an internal combustion engine according to the present invention comprises a replenishing pump whose blind cylinder casing comprises a jacket in which the replenishing piston moves.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine according to the present invention comprises a replenishing pump whose blind cylinder comprises a discharge end-of-travel light which connects said cylinder to the replenishing outlet valve. so that the replenishing piston closes said light at the end of the discharge stroke and is braked and stopped in its discharge stroke.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a replenishing pump whose maximum neck of the replenishing piston is limited in the discharge direction by a discharge stop and / or or in the direction of suction by a suction stop.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises an electromagnetic solenoid action with an electromagnetic solenoid whose replenishing magnetic core is traversed by the replenishing piston. which it is rigidly mounted, said piston passing through the magnetic re-supply cage from one side to cooperate on one side of said cage with the blind cylinder and on the other side of said cage with the return spring of said piston.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a replenishing pump which includes a piston and the replenishment wax which can perform comes in an open cylinder arranged in an open cylinder casing which is integral body directly or indirectly with a pump casing so that said piston, said cylinder and said pump casing together define a variable volume within said lash cylinder, said replenishing tubular piston cooperating with a tubular piston inlet valve consisting of a ball and a spring, said ball bearing on a seat fitted at the end and inside of said piston and an open cylinder outlet valve consisting of a ball and a spring said ball bearing on a seat arranged at the end and outside said cylinder, said valve inlet admitting hydraulic fluid from the replenishing tank while said outlet valve expels said fluid into the compensation pressure accumulator or the replenishing pressure accumulator.
  • a replenishing pump which includes a piston and the replenishment wax which can perform comes in an open cylinder arranged in an open cylinder casing which is integral body directly or indirectly with a pump
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises an open cylinder casing which comprises a fluid conveying duct. hydraulic connecting directly or indirectly the tubular piston inlet valve with a pump inlet port that includes the pump housing.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine according to the present invention comprises a pump housing which has a hydraulic fluid outlet conduit directly or indirectly connecting the open cylinder outlet valve with an orifice. pump outlet that includes the pump housing.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine according to the present invention comprises a replenishing tubular piston which is actuated in translation in a first direction by an electric solenoid actuator consisting mainly of a magnetic core. replenishment integral with said piston, a coil of conductive wire and a magnetic resupply cage, and in a second direction by a return spring of the replenishing tubular piston.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a magnetic replenishing core which is provided with at least one core channel indirectly connecting the hydraulic fluid conveying conduit to the center of the replenishing tubular piston via the tubular piston inlet valve, the open cylinder housing, said core and said piston being commonly housed inside a sealed bushing while said bushing conveys the hydraulic fluid from the conduit to the said channel.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a replenishing tank which is supplied with hydraulic fluid by the lubricating oil circuit of the internal combustion engine.
  • the electro-hydraulic cylinder and reciprocating valve actuator for an internal combustion engine according to the present invention comprises a replenishing tank which contains a specific hydraulic fluid and is independent of the lubrication oil circuit of the internal combustion engine.
  • the electro-hydraulic valve actuator with jack and reciprocating cam for an internal combustion engine according to the present invention comprises a valve actuator hydraulic cylinder comprising at least one drain which recovers hydraulic fluid leaking from said cylinder, so that said fluid returns to the replenishment tank via at least one jack drain pipe.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine according to the present invention comprises a volumetric hydraulic pump comprising at least one drain which recovers hydraulic fluid leaking from said pump, so that said fluid returns to the replenishment tank via at least one pump drain pipe.
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam for an internal combustion engine according to the present invention comprises one or more purge valves placed on the hydraulic cylinder and / or on the volumetric hydraulic pump and / or at any point of the incoming high pressure hydraulic circuit and / or outgoing high pressure hydraulic circuit and / or low pressure hydraulic circuit.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a valve opening cam which is a wedge-shaped spool which can translate under the action of the hydraulic actuator actuator. valve in a guide or slideway in the cylinder head of the internal combustion engine so that the wedge shape of said drawer creates a local variation in thickness that can lift or remove from its seat the valve of the internal combustion engine.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for an internal combustion engine comprises a guide or slide comprising at least one roller on which the wedge-shaped drawer rolls.
  • the actuator of electro-hydraulic valve with cylinder and reciprocating cam for internal combustion engine comprises a drawer in wedge shape which cooperates with a rocker arm articulated at one of its ends around at least one integral latch anchor of the internal combustion engine, and provided at its other end with at least one flange of the inguet that i can push directly or indirectly on the tail that includes the valve of said motor to open said valve.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for an internal combustion engine comprises a valve opening cam which consists of a cam follower hinged at one of its ends around an axis and which comprises at its other end a tangential lifting surface, said surface having a shape such that it radially exerts a thrust relative to said axis on a roller rocker latch when the cam follower rotates about its said axis under the action of the hydraulic valve actuator actuator and the pawl itself being articulated at one of its ends around at least one integral latch anchor of the engine, and being provided at its other end with at least one touch pawl so as to be able to push directly or indirectly on a tail that includes the valve of said motor to open said valve.
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam for an internal combustion engine comprises a mechanical transmission connecting the cam follower to the hydraulic actuator valve which consists of a thrust rod comprising at each of its two ends a pivoting joint and / or ball joint, the first end bearing on or in the valve actuator piston, while the second end is supported on the body of the cam finger.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine according to the present invention comprises a cam finger return spring which is constituted by at least one helical spring which exerts a counterforce to that of the piston. valve actuator and which tends to move away from one another two pivoting and / or ball joints guided relative to each other by at least one slide connection, the first articulation bearing directly or not on the internal combustion engine while the second joint is supported on the body of the cam finger.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine according to the present invention comprises a tangential lifting surface which terminates in an abutment which can come into contact with the roller tilting latch so as to limit the angular displacement of the cam finger.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises at least one replenishing pressure accumulator which is interposed between the replenishing pump and the compensation pressure accumulator.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine according to the present invention comprises a replenishing pressure accumulator whose output comprises a locking valve.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a replenishing pressure accumulator which is connected to the compensation pressure accumulator by a duct comprising at least one anti-backflow valve. it allows the hydraulic fluid to flow from the re-supply pressure accumulator to the compensation pressure accumulator and not the reverse.
  • the electro-hydraulic cylinder actuator and reciprocating cam actuator for the internal combustion engine comprises a high pressure valve opening pipe which has at least one pressure retaining valve positioned towards its nearest end. the volumetric hydraulic pump, said valve allowing the hydraulic fluid from said pump to enter said conduit, but not to emerge.
  • the electro-hydraulic valve actuator with jack and reciprocating cam for an internal combustion engine comprises at the output of the positive displacement hydraulic pump a low-pressure reservoir check valve positioned between said outlet and the solenoid valve. exit shutter from pump, said valve allowing the hydraulic fluid to go from the output of the volumetric hydraulic pump to said low pressure reservoir, but not the opposite.
  • the actuator of electro-hydraulic valve with cylinder and reciprocating cam has for function:
  • the electrohydraulic valve actuator with cylinder and reciprocating cam also comprises:
  • At least one cam position sensor and / or at least one valve position sensor At least one computer that controls the different solenoid valves of said actuator; ⁇ At least one sensor which measures the angular position of the crankshaft of the engine, which is taken into account by the computer to control the valve opening, closing valve and pump outlet shutoff solenoid valves so that the position actual value of the valve measured by the cam angular position sensor and / or the valve position sensor for each angular position of the crankshaft matches the actual opening, lifting height and closing point sought for the the valve (s) considered (s), these various sensors, the computer and these various solenoid valves providing a closed loop control device of the position of the valves.
  • Figure 1 illustrates the block diagram of the electrohydraulic valve actuator with reciprocating jack and cam according to the present invention as it can be provided for actuating only one of the valves of a reciprocating internal combustion engine.
  • FIG. 2 illustrates the block diagram of the actuator according to the invention as it can be designed to actuate the eight intake or exhaust valves of a four-cylinder and four-valve reciprocating internal combustion engine. cylinder, each group of two valves of the same cylinder being actuated by the same hydraulic actuator valve actuator.
  • Figure 3 illustrates the block diagram of the actuator according to the invention as it can be provided for actuating the eight intake valves and the exhaust valves of a four-cylinder engine and four valves by cylinder each group of two valves of the same cyl rim being actuated by the same hydraulic actuator valve actuator.
  • Figure 4 is a schematic sectional view of an example of implantation on an alternative internal combustion engine of the actuator according to the invention.
  • Figure 5 is an exploded view of the volumetric hydraulic pump of the actuator according to the present invention when in a particular embodiment said pump is compartmentalized so as to constitute several autonomous pumps driven by the same shaft and housed in the same housing.
  • FIG. 6 is a diagrammatic sectional view of the valve opening cam, the hydraulic actuator valve actuator and the mechanical transmission between said actuator cylinder and said actuator cam according to the present invention when according to a particular embodiment of said embodiment transmission is a rack cooperating with a pinion integral with the axis of said cam.
  • FIG. 7 is a diagrammatic sectional view of the valve opening cam, of the hydraulic valve actuator cylinder and of the mechanical transmission between said jack and said cam of the actuator according to the present invention when according to a particular embodiment of said embodiment transmission is a valve opening rod articulated on a cam arm that includes said cam.
  • Figure 8 is a schematic sectional view of the valve opening cam, the valve actuator hydraulic cylinder and the mechanical transmission between said cylinder and said cam of the actuator according to the present invention when according to a particular embodiment of said cam takes the form of a wedge-shaped drawer that can translate between a roller slide and a roller latch.
  • FIG. 9 is a diagrammatic sectional view of the valve opening cam according to the present invention when according to a particular embodiment it is actuated by a rotary hydraulic jack mounted directly on the axis of said cam, the mechanical transmission between said cylinder and said cam being constituted of said axis.
  • Figures 10 and 1 1 are schematic sectional views, respectively open valve and closed valve, of the valve opening cam, the valve actuator hydraulic cylinder and the mechanical transmission between said cylinder and said cam of the actuator according to the invention, when according to a particular embodiment of said cam has two open or closed joints and a lever cam contact surface, and that said cam cooperates with a rocker latch.
  • Figure 12 is a schematic sectional view of a variant of the actuator components shown in Figures 10 and 11 which is distinguished in that the valve opening cam is rotated by means of a rotation arm one of whose ends is integral with the axis of said cam and which cooperates with an arm push rod which transmits the force produced by the valve actuator piston.
  • FIG. 13 is a schematic sectional view of the valve opening cam, the hydraulic valve actuator cylinder and the mechanical transmission between the said actuator cylinder and the said actuator cam according to the present invention, the said cam being constituted by a finger cam member hinged at one of its ends about an axis its other end having a tangential lifting surface cooperating with a rocker rocker latch.
  • FIGS. 14 and 15 are diagrammatic sectional views of the valve opening solenoid valve and / or the valve closing solenoid valve and / or the pump outlet closing solenoid valve according to the present invention when the latter takes the form of a solenoid valve tube according to a particular embodiment, respectively in the closed position ( Figure 14) and in the open position ( Figure 15).
  • Figure 16 is a schematic view of the replenishing pump according to the present invention and according to a first embodiment providing a blind cylinder.
  • Figure 17 is a diagrammatic sectional view of the refilling pump according to the present invention and according to a second particular embodiment providing a replenishing tubular piston.
  • Figures 18 to 20 are three-dimensional exploded views of the replenishing pump according to the present invention and according to the second embodiment as shown in Figure 17.
  • Figure 21 illustrates the block diagram of the electrohydraulic valve actuator cylinder and cam alternative according to the present invention such that it can be provided to actuate u only the sou papes of an alternating internal combustion engine, the pump inlet check valve being replaced by a pump inlet solenoid valve mounted parallel to a pump inlet pressure limiter.
  • FIGS. 1 to 4 show an electro-hydraulic valve actuator with jack and reciprocating cam 1 for an internal combustion engine 100.
  • the electro-hydraulic valve actuator 1 comprises at least one valve actuator hydraulic cylinder 2 comprising at least one a valve actuator piston 3 which opens at least a valve 101 of the internal combustion engine 100 or a piston compressor (s) when said hydraulic cylinder 2 is connected by a valve opening solenoid valve 4 with at least a high pressure hydraulic system entering 5.
  • Said hydraulic cylinder 2 closes said valve 101 when it is connected by a valve closing solenoid valve 6 with at least one outgoing high pressure circuit 7.
  • the hydraulic high pressure incoming and outgoing 7 7 may include a flow divider known per se for sharing flow to or from a plurality of hydraulic actuators 2.
  • the electro-hydraulic valve actuator 1 comprises at least one volumetric hydraulic pump 8 comprising on the one hand at least one output connected to a low-pressure hydraulic circuit 9 connected to at least one low reservoir pressure 10 and on the other hand at least one input connected to said low pressure hydraulic circuit 9.
  • the low pressure reservoir 10 consists of at least one compensation pressure accumulator 51 maintained under pressure by at least one replenishing pump 52, which feeds said accumulator 51 with hydraulic fluid by means of suction fluid.
  • the compensation pressure accumulator 51 may be diaphragm, piston or any other type known to those skilled in the art, which can be housed in the housing 35. of the volumetric hydraulic pump 8 and whose particular function is to limit the effects of the compressibility of the hydraulic fluid on the operation of the actuator 1 according to the invention on the one hand, and to avoid any phenomenon of cavitation inside circuit of said actuator on the other hand.
  • the positive displacement hydraulic pump 8 rotates at a speed proportional to this l l e of a crankshaft 1 02 that includes the internal combustion engine 100.
  • the positive displacement hydraulic pump 8 can be fixed displacement or variable displacement, internal gear, external gear, piston (s), screw or paddle (s).
  • the displacement hydraulic pump 8 can be attached to the internal combustion engine 100 and can be driven by the crankshaft 102 of said engine by at least one pinion or at least one chain or at least one belt or via a fixed or variable ratio transmission.
  • the drive of the volumetric hydraulic pump 8 by said crankshaft 102 can operate only mechanically or also electrically via an alternator which drives an electric motor driving said pump.
  • the electrical energy produced by said alternator may or may not be previously stored in a battery and the low pressure hydraulic circuit 9 may comprise a pressure sensor which returns the value of the pressure in said circuit to a computer.
  • the electro-hydraulic valve actuator 1 comprises at least one high pressure valve opening pipe 1 1 relying on the output of the positive displacement hydraulic pump 8 with the incoming high pressure hydraulic circuit 5 of the hydraulic actuator valve 2.
  • the electrohydraulic valve actuator 1 comprises at least one high-pressure valve closing conduit 12 connecting the inlet of the positive displacement hydraulic pump 8 with the high-pressure hydraulic circuit exiting 7 of the hydraulic actuator valve 2.
  • the electrohydraulic valve actuator 1 comprises at least one pump outlet shutoff solenoid valve 13 which can prevent the expelled hydraulic fluid at the output of the positive displacement hydraulic pump 8 from returning to the low pressure hydraulic circuit 9, from so that said fluid is forced into the high pressure valve opening pipe 1 1.
  • a pressure limiter 144 may be mounted parallel to the pump outlet shutoff solenoid valve 13, said limiter allowing the hydraulic fluid to pass directly from the outlet of the pump. the hydraulic volumetric pump 8 to the low-pressure tank 1 0 without passing through said solenoid valve when the pressure rating is limited to the solenoid valve exceeds a certain value.
  • the electro-hydraulic valve actuator 1 comprises at least one pump inlet check valve 14 which prevents the hydraulic fluid from the valve actuator hydraulic cylinder 2 via the high pressure valve closing conduit 12 from returning directly to the valve. low pressure hydraulic circuit 9, so that said fluid is forced to the inlet of the positive displacement hydraulic pump 8.
  • Said nonreturn valve 14 allows said volumetric hydraulic pump 8 to suck said fluid contained in the low pressure hydraulic circuit 9, when the pressure of the latter is greater than the pressure prevailing in the high pressure valve closing duct 12.
  • Said nonreturn valve 14 may according to a non-limiting embodiment consist of a ball held on its seat by a spring.
  • the pump inlet check valve 14 can be replaced by a pump inlet solenoid valve 142, which can then be mounted in parallel with a pump inlet pressure limiter 143 which allows the hydraulic fluid to pass directly from the low pressure tank 1 0 to the inlet of the positive displacement hydraulic pump 8 without passing through said solenoid valve 142 when the pressure difference across the said solenoid valve exceeds a certain value.
  • This configuration can advantageously cooperate with a non-return valve 145 of high pressure valve closing conduit 12 to allow the pressure in the low pressure tank 10 to be greater than that required for the complete closure of the valve 101 of the engine 100, said configuration allowing in particular to reduce the average pressure difference applied across the volumetric hydraulic pump 8 to improve the energy efficiency of the electro-hydraulic valve actuator 1.
  • the electro-hydraulic valve actuator 1 comprises at least one valve opening cam 15 connected on the one hand to the hydraulic actuator valve 2 by a mechanical transmission 16, and on the other hand to the valve 101 of the engine to internal combustion 100 directly or through an intermediate transmission 17.
  • Said valve opening cam 15 moves in one direction during the opening maneuvers of said valve 101, then in the opposite direction during the closing maneuvers of said valve 101.
  • Said intermediate transmission 17 may be a pusher, a rocker or a roller inguet 18 known to those skilled in the art, the latter may optionally comprise an automatic device known per se of catching up between said cam 15 and said valve 101.
  • Said valve opening cam 15 is the moving parts with which it cooperates, said mechanical transmission 16 and the intermediate transmission 17 being designed so as to be as light as possible.
  • the electro-hydraulic valve actuator 1 comprises at least one return spring 19 of the valve opening cam 15 which tends to return said cam 15 to the position it has when the valve 101 of the internal combustion engine 100 is closed.
  • Said return spring 19 may be, according to a particular embodiment, the spring 103 ensuring the return to the closed position of said valve 101.
  • the valve 101 of the internal combustion engine 100 comprises an unillustrated position sensor which may be inductive, hall effect or any other type known to those skilled in the art.
  • FIG. 9 shows an exemplary embodiment of the electro-hydraulic valve actuator with jack and reciprocating cam 1 according to the present invention.
  • the electrohydraulic valve actuator 1 comprises a valve actuator hydraulic cylinder 2 which is rotatable and a valve actuator piston 3 having a pallet shape.
  • Said valve actuator piston 3 separates at least one high-pressure chamber 20 from at least one low-pressure chamber 21 so that the pressure of the hydraulic fluid can rotate said piston 3, the latter being reliably connected in rotation directly to the valve opening cam 15.
  • FIG. 6 shows another embodiment of the electro-hydraulic valve actuator with jack and reciprocating cam 1 according to the present invention.
  • the electrohydraulic valve actuator 1 comprises a valve actuator piston 3 which can move in a cylinder 22 and push on a valve opening rack 23 guided in a cylinder head 104 which is provided by the internal combustion engine 100 or piston compressor (s).
  • Said valve opening rack 23 cooperates with a pinion 24 arranged around an axis 25 of the valve opening cam 15 so as to driving said cam 15 in rotation when said piston 3 moves in longitudinal translation, said rack 23 and said pinion 24 constituting the mechanical transmission 16.
  • the pinion 24 may consist of a toothed sector of some degrees arranged directly on the periphery of the valve opening cam 15.
  • the valve opening rack 23 may be guided in the cylinder head 104 of the internal combustion engine 100 or by means of at least one ball or roller bearing 26.
  • FIG. 7 shows another embodiment of the electro-hydraulic valve actuator with jack and reciprocating cam 1 according to the present invention.
  • the electrohydraulic valve actuator 1 comprises a valve actuator piston 3 which can move in a cylinder 22 and push a valve opening rod 27 with one end of which it is hinged.
  • valve opening rod 27 in turn pushes on a cam arm 28 which directly or indirectly comprises the valve opening cam 15 with which the other end of said rod 27 is also hinged so as to drive said cam In rotation when said valve actuator piston 3 moves in longitudinal translation.
  • valve opening rod 27 and the cam arm 28 constitute the mechanical transmission 16 of the electro-hydraulic valve actuator 1.
  • the valve opening rod 27 is articulated to at least one of its two ends by means of an open or closed ball joint 29.
  • the valve opening cam 15 includes a cam angular position sensor 30 which may be an encoder or any other type of angular sensor known to those skilled in the art (FIGS. 6, 7, 9 and 12).
  • the valve opening cam 15 cooperates with a cam stop, not shown, which limits the maximum angular position of said cam 15 when the valve 101 of the internal combustion engine 100 actuated by said cam 15 is closed.
  • FIG. 5 shows an exemplary embodiment of the volumetric hydraulic pump 8 of the electro-hydraulic valve actuator with jack and reciprocating cam 1 according to the present invention.
  • the volumetric hydraulic pump 8 comprises several compartments 31 which each constitute a self-contained pump comprising at least one inlet 32 and at least one outlet 33 connected to at least one hydraulic actuator valve 2, said autonomous pumps being rotated by the same shaft 34 and being housed in the same casing 35.
  • Figures 10 and 1 1 another embodiment of the actuator electro-hydraulic cylinder actuator and cam alternative 1 according to the present invention.
  • the valve opening cam 15 has two open or closed hinges 36, 37 and a lever cam contact surface 38.
  • the first hinge 36 is integral with the internal combustion engine 100 while the second hinge 37 is connected to the valve actuator piston 3 directly by a piston flap or indirectly by a thrust rod 40.
  • the valve opening cam 15 can roll and / or slide on a tilting contact surface 41 arranged on a rocker latch 42 articulated at one of its ends around at least one latch anchor 43 integral with said motor 100 and provided at its other end with at least one pawl flap 44 which can push directly or indirectly on the shank 105 of at least one valve 101 of said motor 100 to open said valve.
  • the two joints 36, 37 of the valve opening cam 15, the lever cam contact surface 38, the tilting contact surface 41 and the positioning of the latch anchor 43 and the latch tab 44 being provided so as to provide the valve actuator piston 3 with a large lever arm to open the valve 101 of the internal combustion engine 100 when the latter is closed, said lever arm then becoming smaller as the lift height of said valve 101 is large.
  • the latch anchor 43 may consist of a hydraulic device known in itself to compensate for the clearance of said valve 101.
  • valve opening cam 15 the shape of the contact surface 41 provided on the rocker latch 42, the positioning of the joint integral with the internal combustion engine 100 of said cam 15 and the positioning the anchor latch 43 integral with said motor 100 are determined so as to promote the greatest possible rolling component and the smallest possible glissement component at the point of contact between said cam 15 and said contact surface 41 when said valve 101 is operated in opening or closing.
  • the valve opening cam 15 has two joints 36, 37 at least one of the two open or closed joints is a ball 45.
  • the push rod 40 is articulated at each of its ends by a ball joint, the first ball joint 46 being arranged in or at the end of the valve actuator piston 3 while the second ball joint 47 is arranged in or on the valve opening cam 15.
  • the opening cam valve 15 may be a wedge-shaped drawer 90 which can translate under the action of the valve actuator hydraulic cylinder 2 in a guide or slide 91 provided in the cylinder head 104 of the internal combustion engine 100 so that the shape corner of said drawer 90 creates a local variation of thickness that can lift or remove from its seat the valve 101 of the internal combustion engine.
  • the guide or slide 91 of the valve opening cam 15 may consist of at least one roller 92 on which rolls the wedge-shaped drawer.
  • the wedge-shaped drawer 90 cooperates with a tilting latch 18 articulated at one of its ends around at least one latch anchor 43 secured to said motor 100, and provided at its other end with at least one latch flap 44 which can push directly or indirectly on the tail 105 that includes a valve 101 of said motor 100 to open said valve.
  • the latch anchor 43 may consist of a hydraulic device known in itself to play back said valve.
  • valve opening cam 15 may consist of a cam follower 131 hinged at one of its ends about an axis 133 and having at its other end a tangential surface of 132, said surface having a shape such that it radially exerts a thrust relative to axis 1 33 on a roller tilt inguet 1 8 when the cam follower 131 rotates about its said axis 133 under the action of hydraulic cylinder valve actuator 2.
  • the pawl 18 is itself hinged at one of its ends around at least one pawl anchor 43 secured to the motor 100, while being provided at its other end with at least one pawl flap 44 so as to be able to push directly or indirectly on the tail 105 that includes the valve 101 of said motor to open said valve.
  • the mechanical transmission 1 connecting the cam follower 131 to the hydraulic actuator valve 2 may advantageously consist of a thrust rod 40 having at each of its two ends 135, 136 a pivoting joint and / or ball joint, the first end 135 bearing on or in the valve actuator piston 3, while the second end 136 bears on the body of the cam finger 131.
  • the return spring 19 of the cam finger 13 may consist of at least one helicoidal spring 1 34 that exerts a counterforce to that of the valve actuator piston 3, and tends to move away one of the other two swivel joints and / or ball joint 138, 139 guided relative to each other by at least one slide connection 137, the first hinge 138 bearing directly or not on the combustion engine internal 100 while the second articulation 139 is supported on the body of the cam finger 131.
  • the tangential lifting surface 132 may terminate in a stop 140 that can contact the roller tilt inguet 18 so as to limit the angular displacement of the cam finger 131.
  • FIG. 12 shows another embodiment of the electro-hydraulic valve actuator with jack and reciprocating cam 1 according to the present invention.
  • the valve opening cam 15 has a lever cam contact surface 38.
  • valve opening cam 15 is rotated by means of at least one rotation arm 48, one end of which is integral with the axis 25 of said cam 15 while its other end is articulated by means of a pivot or ball joint 49 with the first end of an arm push rod 40.
  • the second end of said rod 40 is articulated by means of a pivot connection or ball joint 47 with the valve actuator piston 3.
  • the valve opening cam 15 can roll and / or slide on a tilting contact surface 41 arranged on a rocker latch 42 articulated at one of its ends around at least one latch anchor 43 integral with the motor. internal combustion 100, and provided at its other end with at least one pawl flap 44 which can push directly or indirectly on a shank 105 that includes at least one valve 101 of said motor 100 to open said valve 101.
  • the axis 25 of the valve opening cam 15, the lever cam contact surface 38, the tilting contact surface 41 and the positioning of the latch anchor 43 and the latch tab 44 are provided. so to offer the valve actuator piston 3 a large lever arm to open the valve 101 of the internal combustion engine 100 when the latter is closed, said lever arm then becoming lower as the lifting height of said valve 101 is large .
  • the rotation arm 48 can rotate a plurality of valve opening cams 15.
  • latch anchor 43 may consist of a hydraulic device known in itself to compensate for play of said valve.
  • valve opening cam 15 the shape of the contact surface provided on the rocker latch 42, the positioning of the integral hinge of the internal combustion engine of said cam and the positioning of the anchoring of the idle ground rocker is determined so as to favor the largest possible rolling component and the smallest sliding component possible at the point of contact between said cam and said surface when said valve is operated in opening or in closing.
  • the valve actuator piston 3 moves in a cylinder 22 provided with a piston end-of-stroke damping light 50.
  • the damping lumen 50 is closed in whole or in part by said piston 3 when said piston 3 comes close to the position it has when the valve 101 of the internal combustion engine 100 which it actuates is closed.
  • Said damping light 50 braking said piston 3 by progressive reduction of the passage section of the hydraulic fluid which is expelled from said hydraulic cylinder 2 during the closing of said valve 101.
  • valve actuator piston 3 moves in a cylinder 22 provided with an end stop piston stroke the latter l im ing the depth of introduction of said piston 3 in said cylinder 22.
  • FIGS. 14 and 15 show an embodiment of the valve opening solenoid valve 4 and / or valve closing solenoid valve 6 and / or pump outlet solenoid valve 13 of the electro-hydraulic cylinder actuator actuator and reciprocating cam 1 according to the present invention.
  • the valve opening solenoid valve 4 and / or the valve closing solenoid valve 6 and / or the pump outlet closing solenoid valve 13 is a tube solenoid valve 60 consisting of at least one rectilinear tube 61 capable of moving longitudinally in a valve housing 62 having an upper chamber 63 and a lower chamber 64.
  • the straight tube 61 has a first end 65 opening into the upper chamber 63 and a second end 66 opening into the lower chamber 64.
  • the second end 66 of the rectilinear tube 61 may come into contact with at least one closure surface 67 integral with said valve housing 62 so as to seal as tightly as possible said second end.
  • the tube solenoid valve 60 comprises sealing means 68 between the outer surface of the straight tube 61 and the valve housing 62 which isolate the upper chamber 63 from the lower chamber 64.
  • the solenoid valve 60 comprises at least one closing spring 69 which tends to keep the rectilinear tube 61 in contact with the sealing surface 67.
  • the solenoid valve 60 comprises at least one electric actuator 70 capable of applying rectilinear tube 61 a force opposite to that produced by the closing spring 69, said force being sufficient to detach the rectilinear tube 61 of the sealing surface 67 when said actuator is traversed by an electric current.
  • the electric actuator 70 consists of a coil of conductive wire 71 which attracts a core or magnetic paddle 72 when said coil 71 is traversed by an electric current.
  • the magnetic core or paddle 72 of the electric actuator 70 can be housed in the upper chamber 63 of the valve housing 62.
  • the conductive wire coil 71 of the electric actuator 70 can be housed in the upper chamber 63 of the valve housing 62.
  • the conductive wire coil 71 of the electric actuator 70 may be housed outside the upper chamber 63, the magnetic field generated by said coil 71 when an electric current passes through the outer wall of the coil. said chamber 63 so as to exert a force on the core or magnetic paddle 72.
  • the first end 65 of the rectilinear tube 61 may be integral with the core or magnetic paddle 72.
  • the core or magnetic pallet 72 can be made in the same metal part as the straight tube 61, or fixed on said core by gluing, screwing, crimping, or by any other means known to those skilled in the art.
  • the first end 65 of the rectilinear tube 61 comprises at least one radial and / or axial orifice 88 opening into the upper chamber 63.
  • the second end 66 of the rectilinear tube 61 is of troncospheric shape and has a line of contact with the sealing surface. 67 similar to that made by a ball bearing on a seat.
  • the sealing surface 67 is arranged on an independent piece 73 mounted floating in the valve housing 62, said part 73 being able to align with the rectilinear tube 61 when the second end 66 of said tube comes into contact with said sealing surface 67.
  • the valve casing 62 comprises directly, or indirectly via an intermediate plug 74, an orifice 75 placed in the open air which is closed by the independent part 73 on which the closure surface 67 is arranged so that the applied force by the closing spring 69 via the rectilinear tube 61 on said independent piece 73 and / or the force resulting from the pressure in the upper chamber 63 and / or the lower chamber 64 maintains said piece 73 under pressure on said orifice 75 to keep it closed.
  • the contact surface between said independent part 73 and said valve housing 62 may be provided with a seal, or with an edge which locally increases the contact pressure so as to improve the seal between said part 73 and said casing 62.
  • the valve housing 62 is fixed to the internal combustion engine 100 and has orifices and / or inlet-outlet conduits 89 connecting the upper chamber 63 and / or the lower chamber 64 with the actuator hydraulic cylinder. 2 or with the volumetric pump 8 via the incoming high-pressure hydraulic circuit 5, the outgoing high-pressure circuit 7 or the low-pressure hydraulic circuit 9.
  • the section of the straight tube 61 at the level of the tightness that led it tube constitutes with the valve housing 62 is slightly smaller than the section of said tube at its contact with the sealing surface 67.
  • the sealing means 68 consist of the outer surface of the rectilinear tube 61 which cooperates with the internal one of the valve housing 62.
  • the sealing means 68 may also be constituted by the external surface of the rectilinear tube 61 which cooperates with the internal one valve housing 62 in which can be accommodated at least one annular seal and / or at least one segment that can be advantageously replaced by a small clearance of a few microns left between the outer surface of the rectilinear tube 61 and the inner one of the valve housing 62 .
  • rectilinear tube 61 On the rectilinear tube 61 may be arranged an adjustable or non-adjustable stop which cooperates with an axial stop surface provided directly or indirectly in the valve housing 62, said stop determining the maximum distance between said tube and the sealing surface 67 with which it cooperates.
  • FIG. 16 shows an example of realisation of the replenishing pump 52 of the electro-hydraulic valve actuator with cylinder and reciprocating cam 1 according to the present invention.
  • the replenishing pump 54 is capable of reciprocating movements 54 in a blind cylinder 55 provided in a blind cylinder housing 56 so as to define a variable volume inside said cylinder.
  • the replenishing piston 54 cooperates with a replenishment inlet valve 57 and a replenishment outlet valve 58, whose outlet and inlet respectively open into said volume, said inlet valve 57 admitting hydraulic fluid from the reservoir while said outlet valve 58 expels said fluid in the compensation pressure accumulator 51 or in the replenishing pressure accumulator 85.
  • the replenishing piston 54 is actuated in translation in a first direction by an electric actuator solenoid 80 mainly consisting of a magnetic replenishing core 81, a coil of conductive wire 82 and a magnetic resupply cage 83, and in a second direction by a spring 84 for biasing said replenishing piston 54.
  • the blind cylinder housing 56 is made of the same metal part as the magnetic resupply cage 83 of the solenoid electric actuator 80.
  • the blind cylinder casing 56 comprises a jacket 59 in which the replenishing piston 54 of the replenishing pump 52 moves.
  • the blind cylinder 55 includes a discharge end-of-travel light 76 which connects said cylinder to the replenishment outlet valve 58 so that the replenishing piston 54 closes said light at the end of the delivery stroke and is braked and stopped in its course. of repression.
  • the maximum stroke of the replenishing piston 54 is limited in the direction of delivery by a discharge stop 77 and / or in the direction of suction by a suction stop 78.
  • the discharge stops 77 and suction 78 may consist of at least one piece of elastic material with damping properties.
  • the magnetic replenishing core 81 is traversed by the replenishing piston 54 on which it is rigidly mounted.
  • the replenishing piston 54 passes through the replenishment cage 83 from one end to the other to cooperate on one side of said cage with the blind cylinder 55 and on the other side of said cage with the return spring 84 of said piston. replenishment 54.
  • this replenishment pin 54 can be attached to the replenishing core 81.
  • said replenishing core 81 comprises connecting means with the return spring 84, the latter being rendered indirectly integral with said replenishing piston 54 so as to recall both said core and said spring.
  • the replenishing pump 52 may comprise a replenishing staple 1 07 which can reciprocate in an open cylinder 108 in a cylinder housing. open 109 which is integral body directly or indirectly with a pump housing 126.
  • said piston 107, said cylinder 108 and said pump casing 126 together define a variable volume 1 10 inside said cylinder 108, said replenishing tubular piston 107 cooperating with a tubular piston inlet valve 1 1 1 constituted of a ball 1 13 and a spring 1 14 said ball bearing on a seat 1 15 arranged at the end and inside of said piston 107 and an open cylinder outlet valve 1 12 consisting of a ball 1 16 and a spring 1 17 said ball bearing on a seat 1 18 arranged at the end and outside of said cylinder 109.
  • said inlet valve 1 1 1 admits hydraulic fluid from the replenishment tank 53 while the flap of output 1 12 expels said fluid into the compensation pressure accumulator 51 or the replenishment pressure accumulator 85.
  • the open cylinder housing 109 may comprise a hydraulic fluid conveyance conduit 1 24 which directly or indirectly connects the tubular piston inlet valve 1 1 1 with a pump inlet port 125 pump casing 126.
  • the pump casing 126 includes a hydraulic fluid outlet duct 127 directly or indirectly connecting the open cylinder outlet valve 1 12 with a pump outlet port 128 that includes the pump casing 126.
  • the replenishing tubular piston 107 can be actuated in translation in a first direction by an electric solenoid actuator 1 19 consisting mainly of a magnetic replenishing core 1 20 sol idaire dud it piston 1 07, d a coil of conductive wire 121 and a magnetic resupply cage 122, and in a second direction by a return spring 123 of the replenishing tubular piston 107.
  • an electric solenoid actuator 1 19 consisting mainly of a magnetic replenishing core 1 20 sol idaire dud it piston 1 07, d a coil of conductive wire 121 and a magnetic resupply cage 122, and in a second direction by a return spring 123 of the replenishing tubular piston 107.
  • the magnetic replenishing core 120 may be provided with at least one core channel 1 29 indirectly connecting the hydraulic fluid delivery conduit 124 to the center of the replenishing tubular piston 107 via the piston inlet valve 1 1 tubular 1, the open cylindrical casing 1 09, led it core 1 20 and led it piston 1 1 1 being commonly housed inside a sealed sleeve 130 while said sleeve 130 conveys the hydraulic fluid from the leads 124 to said channel 129.
  • the replenishing tank 53 is supplied with hydraulic fluid by the lubricating oil circuit of the internal combustion engine 100.
  • the replenishing tank 53 contains a specific hydraulic fluid and is independent of the lubricating oil circuit of the internal combustion engine 100.
  • Said hydraulic fluid may be specially formulated so that the efficiency, accuracy and durability of the electro-hydraulic valve actuator with cylinder and reciprocating cam 1 according to the invention are maximal, in particular thanks to a low viscosity of said fluid whatever the operating temperature of the heat engine, low compressibility, good lubricating and anti-wear characteristics or the absence of abrasive particles and corrosive or oxidizing agents.
  • the hydraulic valve actuator actuator 2 may comprise at least one drain, not shown, which recovers hydraulic fluid leaking from said cylinder, so that said fluid returns to the replenishing tank 53 via at least one jack drain pipe.
  • volumetric hydraulic pump 8 may comprise at least one drain, not shown, which recovers hydraulic fluid leaking from said pump, so that said fluid returns to the replenishing tank 53 via at least one pump drain pipe.
  • the electro-hydraulic valve actuator with jack and reciprocating cam 1 may comprise one or more purge valves placed on the hydraulic cylinder 2 and / or on the volumetric hydraulic pump 8 and / or at any point in the circuit. hydraulic high pressure entering 5 and / or outgoing high pressure hydraulic circuit 7 and / or low pressure hydraulic circuit 9.
  • the at least one valve may be of a type similar to those commonly used by those skilled in the art in any hydraulic application.
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam 1 may comprise at least one replenishing pressure accumulator 85 which is interposed between the replenishing pump 52 and the compensation pressure accumulator 51.
  • the replenishing pressure accumulator 85 may supply a plurality of compensation pressure accumulators 51 which respectively supply a plurality of independent valve actuator circuits as shown in FIGS. 2 and 3.
  • the replenishing pressure accumulator 85 supplies said compensation pressure accumulators 51 when the pressure in said circuits drops above a certain value.
  • the replenishing pressure accumulator 85 may be diaphragm, piston or any other type known to those skilled in the art.
  • the output of the replenishing pressure accumulator 85 includes a locking valve to maintain the pressure in said accumulator when the internal combustion engine 100 is at a standstill.
  • the replenishment accumulator 85 is connected to the compensation pressure accumulator 51 via a duct comprising at least one check valve 86, which valve allows the hydraulic fluid to flow from the replenishment accumulator. to the compensation pressure accumulator 51 and not the other way round.
  • the high pressure valve opening pipe 1 1 comprises at least one pressurization valve 87 positioned towards its end closest to the volumetric hydraulic pump 8.
  • the pressurizing valve 87 allows hydraulic fluid from said positive displacement hydraulic pump 8 to enter said conduit but not to exit.
  • the pressure retaining valve 87 makes it possible in particular to prevent the depressurization of said circuit between two valve leavings 101 in order to limit the acoustic emissions and to increase the efficiency of the actuator according to the invention.
  • the output of the displacement hydraulic pump 8 comprises a low-pressure tank check valve 141 positioned between said outlet and the pump outlet shut-off solenoid valve 13, said valve 141 allowing the hydraulic fluid to flow. to go from the output of the volumetric hydraulic pump 8 to said low pressure tank 10, but not the opposite.
  • the electro-hydraulic valve actuator with cylinder and reciprocating cam 1 may comprise at least one hydraulic circuit pressure limiter 146 placed at any point of the low-pressure hydraulic circuit 9 and / or the high-pressure valve opening pipe 1 1 and / or the high pressure valve closing duct 12, said limiter 146 allowing the hydraulic fluid contained in led it circu it 9 and / or its cond u its 1 1, 1 2 to return directly into the replenishing tank 53 when the pressure in said circuit 9 and / or said ducts 1 1, 12 exceeds a certain value.
  • FIG. 1 which illustrates the block diagram of a variant of the invention intended to control only one valve 101
  • FIG. 12 which proposes a particular embodiment thereof
  • the operation of the actuator according to the invention operates as follows:
  • the displacement hydraulic pump 8 is constantly driven by the crankshaft 102 of the internal combustion engine 100.
  • valve opening solenoid valve 4 and the valve closing solenoid valve 6 are closed while the pump outlet shutoff solenoid valve 13 is open and leaving the hydraulic fluid expelled at the output of the positive displacement hydraulic pump 8 to the low-pressure hydraulic circuit 9, the latter supplying the inlet of said pump 8 with hydraulic fluid with the same flow, via the non-return valve of pump inlet 14.
  • the differential pressure between the inlet and the outlet of said pump 8 being low, the latter consumes little energy.
  • the pump outlet shutoff solenoid valve 13 closes and prevents the hydraulic fluid expelled at the output of the positive displacement hydraulic pump 8 from returning to the circuit low hydraulic pressure 9, so that said fluid is naturally forced into the high pressure valve opening pipe 1 1.
  • valve actuator piston 3 pushes on the arm push rod 40, which pushes the rotation arm 48, which drives the valve opening cam 15 to rotate about its axis. 25.
  • the rotation of said cam 15 causes the lever-operated cam contact surface 38 provided on said cam 15 to exert pressure on the tilting contact surface 41 provided on the rocker latch 42.
  • This has the effect of to tilt said pawl 42 which, by resting on its pawl anchor 43 integral with the internal combustion engine 100, pushes on the shank 105 of the valve 101 of said engine via its pawl flap 44, which has the effect of opening said valve 101.
  • FIG. 12 shows that the lift height of the valve 101 of the internal combustion engine 100 can be deduced from the angular position of the valve opening cam 15 which is measured by the cam angular position sensor 30. measured value is returned to the management computer of the internal combustion engine 100.
  • said computer opens the pump outlet shutoff solenoid valve 13, which stops the opening of said valve 101 because the hydraulic fluid expelled at the output of the volumetric hydraulic pump 8 is no longer forced into the high pressure valve opening pipe 1 1 and therefore naturally goes to the low pressure hydraulic circuit 9.
  • valve opening solenoid valve 4 closes, which has the effect of stabilizing the valve 101 in its set position and of trapping a certain quantity of hydraulic fluid under pressure.
  • the pressure retaining valve 87 preventing said fluid from returning to the volumetric hydraulic pump 8.
  • valve may advantageously lead to lower acoustic emissions and / or to a better efficiency of the actuator according to the invention, in particular by reducing the volume of fluid which expands sharply in the air. compensation pressure accumulator 51.
  • valve 101 of the internal combustion engine 100 is kept open as long as the valve closing solenoid valve 6 is not actuated by the computer to open.
  • the opening time of said valve 101 is determined according to the objectives assigned to the control of the internal combustion engine 100, whether to improve the performance in torque and power of said engine, to improve energy efficiency, or to reduce polluting emissions.
  • the computer opens the valve closing solenoid valve 6. This action has the effect of allowing the hydraulic fluid contained in the hydraulic actuator valve 2 to escape through the high pressure hydraulic circuit outgoing 7 and then through the high pressure valve closure pipe 12 to be connected to the inlet of the positive displacement hydraulic pump 8.
  • This action instantly increases the pressure at the inlet of said pump so that said pressure becomes greater than that prevailing in the low pressure hydraulic circuit 9.
  • This pressure difference closes the pump inlet check valve 14 so that the hydraulic fluid from the hydraulic actuator valve actuator 2 is forced to pass through the inlet of said positive displacement hydraulic pump 8.
  • said volumetric hydraulic pump 8 becomes a motor and returns to the crankshaft 102 of the internal combustion engine 100 a part of the mechanical work that was previously allowed to compress the fuel.
  • valve closing solenoid valve 6 can be opened at one time, but also either proportionally or in several times. These latter strategies for opening said solenoid valve can contribute to minimizing the impact that the valve 101 of the internal combustion engine 100 experiences when it lands on its seat, in addition to the variable leverage effect produced by the mechanical transmission. and by the intermediate transmission 17 as shown in FIG. 12.
  • the proportional opening of said valve closing solenoid valve 6 may in particular be obtained by applying across its coil 71 a current modulated in pulse width, this method is also known by the acronym "PWM" (Pulse Width Modulation).
  • PWM Pulse Width Modulation
  • the control of said solenoid valve is entrusted to the computer which cooperates with the cam angular position sensor 30 and / or the angular encoder of the crankshaft 102 of the internal combustion engine 100 to control the speed of said valve 101, particularly at the time of landing. on his seat.
  • the total volume of the hydraulic circuit of the actuator 1 varies as a function of the position of the valve actuator piston 3 in its cylinder 22. This variation of volume is absorbed by the compensation pressure accumulator 51 which maintains the pressure of the low pressure hydraulic circuit 9 between two values, a minimum and a maximum.
  • Said minimum pressure value is sufficient on the one hand, to allow the actuator 1 according to the invention to operate without cavitation phenomenon said phenomenon being deemed destructive, and secondly, to minimize the possible instabilities of position of the valve 101 of the internal combustion engine 100 induced by the compressibility of the hydraulic fluid.
  • said maximum pressure value must not exceed that which allows the valve actuator piston 3 to take off the valve 101 of the internal combustion engine 100 from its seat.
  • the replenishing pump 52 converts the compensation pressure accumulator 51 into hydraulic fluid by sucking said fluid into the replenishing reservoir 53 and discharging said fluid into said accumulator.
  • a replenishing pressure accumulator 85 may advantageously be interposed between the replenishing pump 52 and the compensation pressure accumulators 51 that each of said parallel circuits comprises.
  • only one Replenishment Pressure Accumulator 85 supplies hydraulic fluid to the compensation pressure accumulator 51 included in each low pressure hydraulic circuit 9 via the replenishment check valve 86 included in each of said low pressure hydraulic circuits.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP12787763.7A 2011-09-26 2012-10-11 Elektrohydraulisches ventilstellglied mit alternierendem nocken Withdrawn EP2764217A2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1102903A FR2980515B1 (fr) 2011-09-26 2011-09-26 Actionneur de soupape electro-hydraulique a came alternative
FR1254518A FR2980516B1 (fr) 2011-09-26 2012-05-16 Actionneur de soupape electro-hydraulique a came alternative
PCT/FR2012/052318 WO2013045866A2 (fr) 2011-09-26 2012-10-11 Actionneur de soupape electro-hydraulique a came alternative

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EP2764217A2 true EP2764217A2 (de) 2014-08-13

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US (1) US20130074790A1 (de)
EP (1) EP2764217A2 (de)
JP (1) JP2014528535A (de)
AU (1) AU2012314105A1 (de)
FR (2) FR2980515B1 (de)
WO (1) WO2013045866A2 (de)

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DE102014201910A1 (de) * 2014-02-04 2015-08-06 Schaeffler Technologies AG & Co. KG Aktuator für einen elektrohydraulischen Gaswechselventiltrieb einer Brennkraftmaschine
WO2016049251A1 (en) 2014-09-24 2016-03-31 The Broad Institute Inc. Delivery, use and therapeutic applications of the crispr-cas systems and compositions for modeling mutations in leukocytes
WO2016049163A2 (en) 2014-09-24 2016-03-31 The Broad Institute Inc. Use and production of chd8+/- transgenic animals with behavioral phenotypes characteristic of autism spectrum disorder
US11020166B2 (en) 2015-09-25 2021-06-01 Gyrus Acmi, Inc. Multifunctional medical device
US11076909B2 (en) 2015-09-25 2021-08-03 Gyrus Acmi, Inc. Multifunctional medical device
SE541503C2 (en) * 2016-06-07 2019-10-22 Scania Cv Ab Four Stroke Internal Combustion Engine and thereto-related Method
EP3406866A1 (de) * 2017-05-22 2018-11-28 EMPA Eidgenössische Materialprüfungs- und Forschungsanstalt Hydraulischer antrieb zum beschleunigen und abbremsen dynamisch zu bewegender bauteile
FR3071869B1 (fr) * 2017-10-02 2019-10-11 Vianney Rabhi Actionneur hydraulique de soupape a regeneration
US10704431B2 (en) 2017-10-03 2020-07-07 Vianney Rabhi Regenerative valve hydraulic actuator
CN108661785B (zh) * 2018-07-26 2024-01-23 谭建文 无曲轴旋转式阿特金森循环发动机
US11162436B2 (en) * 2019-09-12 2021-11-02 Jhyager Consulting L.L.C. Camless engine valve control system
DK202200092A1 (en) * 2022-01-31 2023-11-03 Troels Vollertsen A hydraulic valve lifter system, and engine therewith, and a method of its operation

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HU221875B1 (hu) * 2000-06-13 2003-02-28 Attila Püski Szelepvezérlő belső égésű motorhoz
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Publication number Publication date
WO2013045866A3 (fr) 2013-12-19
AU2012314105A1 (en) 2014-04-17
WO2013045866A2 (fr) 2013-04-04
FR2980516A1 (fr) 2013-03-29
FR2980515A1 (fr) 2013-03-29
JP2014528535A (ja) 2014-10-27
FR2980515B1 (fr) 2016-03-11
FR2980516B1 (fr) 2015-12-11
US20130074790A1 (en) 2013-03-28

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