EP3450708A1 - Système de cames coulissantes - Google Patents

Système de cames coulissantes Download PDF

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Publication number
EP3450708A1
EP3450708A1 EP18188627.6A EP18188627A EP3450708A1 EP 3450708 A1 EP3450708 A1 EP 3450708A1 EP 18188627 A EP18188627 A EP 18188627A EP 3450708 A1 EP3450708 A1 EP 3450708A1
Authority
EP
European Patent Office
Prior art keywords
actuator
fluid
cam
cam system
sliding cam
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.)
Granted
Application number
EP18188627.6A
Other languages
German (de)
English (en)
Other versions
EP3450708B1 (fr
Inventor
Jens Dietrich
Thomas Malischewski
Steffen Hirschmann
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.)
MAN Truck and Bus SE
Original Assignee
MAN Truck and Bus SE
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Filing date
Publication date
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Publication of EP3450708A1 publication Critical patent/EP3450708A1/fr
Application granted granted Critical
Publication of EP3450708B1 publication Critical patent/EP3450708B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01L1/047—Camshafts
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • 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
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L1/0532—Camshafts overhead type the cams being directly in contact with the driven valve
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L13/0047—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction the movement of the valves resulting from the sum of the simultaneous actions of at least two cams, the cams being independently variable in phase in respect of each other
    • 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
    • F01L1/047—Camshafts
    • F01L2001/0471—Assembled camshafts
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34426—Oil control valves
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
    • F01L2001/34453—Locking means between driving and driven members
    • F01L2001/34469—Lock movement parallel to camshaft axis
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L2013/0052—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
    • 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
    • F01L2305/00—Valve arrangements comprising rollers
    • 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
    • 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
    • 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
    • F01L2820/034—Pneumatic engines
    • 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
    • F01L2820/04—Sensors
    • 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
    • F01L2820/04—Sensors
    • F01L2820/041—Camshafts position or phase sensors

Definitions

  • the invention relates to a sliding cam system for an internal combustion engine.
  • Valve-controlled internal combustion engines have one or more controllable intake and exhaust valves per cylinder.
  • Variable valve controls allow flexible control of the valves to change the opening time, closing time and / or the valve lift. As a result, the engine operation can be adapted, for example, to a specific load situation.
  • a variable valve train can be designed for example as a sliding cam system.
  • a sliding cam system may include a plurality of cam carriers having a plurality of cams. The cam carriers are axially displaceable and non-rotatably mounted on the camshaft. Actuators can be used to move the cam carriers axially.
  • a transmission device for example a rocker arm, in response to an axial position of the cam carrier sets a cam of the plurality of cams of the cam carrier in operative connection with at least one gas exchange valve. To change a valve control curve of the at least one gas exchange valve, the cam carrier can be moved axially, so that another cam of the cam carrier comes into engagement with the transmission device.
  • An example of a sliding cam system is in WO 2004/083611 A1 disclosed.
  • a disadvantage of known sliding cam systems is often the complex control of Aktorvorraumen for moving the cam carrier or cam with multiple cam tracks.
  • the DE 10 2010 025 099 A1 discloses an adjustable camshaft having at least one shaft and at least one cam package having at least two different cams and / or cam contours.
  • the cam package is axially displaceable on the shaft.
  • an adjusting element is provided, which is at least axially displaceable relative to a longitudinal axis of the shaft.
  • the adjusting element is via a contact element mechanically coupled with the cam package.
  • at least two of the cam packages may be mechanically coupled to the adjustment.
  • the invention is based on the object to provide an alternative or improved sliding cam system, which overcomes disadvantages in the prior art and in particular has a simplified control.
  • the sliding cam system is suitable for an internal combustion engine.
  • the sliding cam system has a camshaft and a plurality of cam carriers each having at least two cams.
  • the plurality of cam carriers is arranged rotationally fixed and axially displaceable on the camshaft.
  • the sliding cam system includes a plurality of fluid-actuated actuator devices, each configured to axially displace a cam carrier of the plurality of cam carriers.
  • the sliding cam system includes a fluid supply device provided for supplying a fluid in fluid communication upstream of the plurality of actuator devices for actuating the plurality of actuator devices. At least two actuator devices of the plurality of actuator devices are fluidly coupled for simultaneous actuation.
  • the fluid coupling between at least two actuator devices allows the simultaneous actuation of both actuator devices by supplying a fluid.
  • the control effort can be considerably simplified because not every actuator device must be operated individually at a specific time. Instead, for example, only a single valve is opened in fluid communication upstream of the actuator devices, thereby actuating the actuator devices.
  • the at least two cams of the cam carrier can be designed differently.
  • a plurality of transmission devices are additionally provided which, depending on an axial position of a respective cam carrier, set a first cam or a second cam of the respective cam carrier in operative connection with at least one gas exchange valve.
  • the gas exchange valves may be intake valves or exhaust valves.
  • the transmission devices may comprise a cam follower, for example a rotatable roller, for following a cam contour of a cam.
  • the actuator devices are identical.
  • the actuator devices can engage with displaceable elements in engagement tracks of the cam carrier for axially displacing the cam carrier.
  • the actuator devices may include slidable members that are slidable in a radial direction with respect to a longitudinal axis of the camshaft or in an axial direction with respect to the longitudinal axis of the camshaft for axially displacing the respective cam carrier.
  • the fluidically coupled, at least two actuator devices are fluidically coupled by means of a group control valve of the fluid supply device.
  • a fluid can be supplied by opening the group control valve simultaneously to the fluidically coupled, at least two actuator devices.
  • the group control valve may be provided in fluid communication downstream of a compressor or pump and upstream of the at least two actuator devices.
  • actuator-specific valves are additionally provided in fluid communication between the group control valve and the actuators of the actuator devices.
  • an actuator-specific control of the sliding cam system can be enabled, if desired.
  • a plurality of Aktorvoriquess jury is provided, each having at least two fluidly coupled actuator devices of the plurality of actuator devices.
  • the grouping of the actuator devices into actuator device groups enables a grouped control of the actuator devices, whereby not every actuator device of an actuator device group must be individually controlled.
  • the Aktorvoriquess jury the plurality of Aktorvoridess jury are each provided downstream of a respective group control valve of the fluid supply device, so that the fluid from the fluid supply device by opening the respective group control valve simultaneously to the fluidically coupled, at least two Aktorvoruzeen the respective Aktorvoridessucc can be fed.
  • a first actuator of a first actuator device and a first actuator of a second actuator device and optionally a first actuator of a third actuator device may be provided in a first actuator device group.
  • a second actuator of the first actuator device and a second actuator of the second actuator device and optionally a second actuator of the third actuator device may be provided in a second actuator device group.
  • a first actuator of a fourth actuator device, a first actuator of a fifth actuator device and optionally a first actuator of a sixth actuator device may be provided in a third actuator device group.
  • a second actuator of the fourth actuator device, a second actuator of the fifth actuator device and optionally a second actuator of the sixth actuator device may be provided in a fourth actuator device group.
  • a first group control valve in fluid communication upstream of the second actuator device, a second group control valve, in fluid communication upstream of the third actuator assembly, a third group control valve, and / or in fluid communication upstream of the fourth actuator assembly, a fourth group control valve may be provided.
  • the group control valves are arranged parallel to each other.
  • a first actuator of a first actuator device is fluidically coupled to a first actuator of a second actuator device.
  • a second actuator of the first actuator device is fluidically coupled to a second actuator of the second actuator device. The couplings enable the first actuators to be actuated simultaneously and the second actuators to be actuated simultaneously.
  • the plurality of actuator devices each have a first actuator for displacing a respective cam carrier in a first direction and a second actuator for displacing the respective cam carrier in a second direction, which is opposite to the first direction.
  • the first direction and the second direction may in particular run parallel to a longitudinal axis of the camshaft.
  • the respective first actuators may be at least partially fluidly coupled to one another and / or the second actuators at least partially fluidly coupled to each other.
  • the plurality of actuator devices is actuated hydraulically or pneumatically.
  • the actuator devices can be connected, for example, to a hydraulic system or pneumatic system already present in a motor vehicle.
  • the sliding cam system further includes a position sensor that detects a rotational position of the camshaft, an engine sensor that detects an operating parameter of the internal combustion engine, and / or a user interface for user input.
  • the sliding cam system additionally has a control unit which is designed to control the fluid supply device for supplying the fluid to the plurality of actuator devices based on the detected rotational position, the acquired operating parameter and / or the user input.
  • control unit refers to a control electronics, which can take over control tasks and / or regulatory tasks depending on the training.
  • control unit is designed to selectively actuate the group control valves based on the detected rotational position, the detected operating parameter and / or the user input.
  • actuators of the plurality of actuator devices each have a control fluid space and an extendable and retractable member, particularly a pin, in operative communication with the control fluid space.
  • the retractable and retractable member extends by supplying the fluid to the control fluid space for displacing the respective cam carrier. This can be provided in a structurally simple manner, a fluid-actuated actuator.
  • the fluid is a compressible gas, in particular air
  • the control fluid space filled with the compressible gas acts as a pneumatic spring when retracting the retractable and extendable element. This can be shocks and thus premature wear of the actuator can be prevented.
  • the pneumatic spring is effected by compressing the compressible gas and expelling the compressed gas.
  • the retractable and extendable element engages in an engagement track of the cam carrier for displacing the cam carrier.
  • the control fluid is supplied to the control fluid space (in particular by corresponding opening of the corresponding group control valve) such that the retractable and extendable element contacts an outer circumferential surface of the cam carrier before the retractable and extendable element engages in the engagement track.
  • the fluid-actuated actuator devices allow the cam-free sections having the engagement tracks to run over the displaceable elements before the displaceable elements finally engage in the engagement tracks.
  • a control effort for the actuator device is significantly reduced, since the time window for actuating the actuator devices is increased.
  • the retractable and retractable element is biased by an elastic member in a retracted state. As a result, the retractable and retractable element can be returned to a basic position.
  • control fluid space is formed in the retracted state of the retractable and extendable element as an annular space. This allows a contact area between a bottom surface of the control fluid space and the retractable and extendable member to be small.
  • control fluid can rest directly on the retractable and extendable element and / or only a small adhesive force between the bottom surface and the retractable and extendable element.
  • the retractable and extendable member may include a pin extending in a direction toward a bottom surface of the control fluid space.
  • a bottom surface of the control fluid space may include a pin extending in a direction toward the retractable and extendable member.
  • control fluid space is sealed with a fluid seal, in particular an O-ring, to an environment of the actuator device.
  • a fluid seal in particular an O-ring
  • the invention also relates to a motor vehicle, in particular commercial vehicle (for example a bus or a lorry), with a sliding cam system as disclosed herein.
  • the fluid supply device preferably has a compressed air tank of the motor vehicle and / or the fluid supply device is integrated in a pneumatic system of the motor vehicle.
  • variable valve train 10 is shown.
  • the variable valve train 10 may be included in a motor vehicle, in particular a commercial vehicle, with an internal combustion engine.
  • the commercial vehicle may be, for example, a truck or a bus.
  • the variable valve train 10 has a camshaft 12 and a cam carrier 14.
  • the variable valve train 10 has a transmission device 16 and a first and second gas exchange valve 20 and 22.
  • the variable valve drive 10 has a first actuator 24 and a second actuator 26.
  • the first actuator 24 and the second actuator 26 form an actuator device 27.
  • the actuator device for example, have only one or more actuators provided in a common housing.
  • the cam carrier 14, the camshaft 12 and the actuator device 27 form part of a shift cam system 11.
  • the shift cam system 11 has a plurality of cam carriers 14 and actuator devices for a plurality of cylinders of the internal combustion engine.
  • the structure of the sliding cam system is described by way of example for a cam carrier 14 and an actuator device 27 for a cylinder of the internal combustion engine, as in the FIGS. 1 and 2 shown.
  • the camshaft 12 may be configured as an intake camshaft, exhaust camshaft, or mixed camshaft that operates both intake valves and exhaust valves.
  • the camshaft 12 may be part of a double camshaft system (not shown in detail) which additionally has another camshaft (not shown).
  • the camshaft 12 is arranged as an overhead camshaft. In other embodiments, the camshaft 12 may also be arranged as an underlying camshaft.
  • the cam carrier 14 On the camshaft 12 of the cam carriers 14 is arranged rotationally fixed.
  • the cam carrier 14 is additionally arranged axially displaceable along a longitudinal axis of the camshaft 12.
  • the cam carrier 14 may be axially displaceable between a first stop 28 and a second stop 30.
  • the cam carrier 14 has two cams 32 and 34 which are offset from each other in a longitudinal direction of the cam carrier 14 and the camshaft 12.
  • the first cam 32 and the second cam 34 are disposed in a central portion of the cam carrier 14.
  • the first cam 32 and the second cam 34 adjoin one another.
  • the first cam 32 and the second cam 34 are formed differently, so that they can cause different valve lift curves of the gas exchange valves 20, 22.
  • the first cam 32 may be an engine brake cam for an exhaust valve and the second cam 34 may be a normal cam.
  • the cam carriers may have a different number of cams, different arrangements of the cams and / or different cam contours of the cams.
  • the cam carrier 14 also has a first cam-free section 38 and a second cam-free section 40.
  • the first cam-free portion 38 and the second cam-free portion 40 are disposed at opposite ends of the cam carrier 14.
  • a first engagement track (shift gate) 42 extends spirally about a longitudinal axis of the cam carrier 14.
  • a second engagement track (shift gate) 44 extends spirally around the longitudinal axis of the cam carrier 14th
  • the actuators 24 and 26 with extendable elements selectively engage the engaging tracks 42, 44.
  • the actuators 24, 26 may be identical.
  • the first actuator 24 may selectively engage the first engagement track 42 for shifting the cam carrier 14 from a first axial position to a second axial position.
  • the cam carrier 14 In the first axial position of the cam carrier 14 abuts against the second stop 30.
  • the cam carrier 14 In the second axial position of the cam carrier 14 abuts against the first stop 28.
  • the cam carrier 14 is shown in the first axial position.
  • the second actuator 26 in turn can selectively engage in the second engagement track 44. Then, the cam carrier 14 is shifted from the second axial position to the first axial position.
  • the displacement is triggered by the fact that the extended element of the respective actuator 24, 26 is stationary with respect to an axial direction of the camshaft 12.
  • the slidable cam carrier 14 is displaced in a longitudinal direction of the camshaft 12 due to the spiral shape of the engaging tracks 42, 44 when the extended element engages with the respective engagement track 42, 44.
  • the displaceable element of the respective actuator 24, 26 is guided by the respective engagement track 42, 44 opposite to the extension direction and thus retracted.
  • the displaceable element of the respective actuator 24, 26 comes out of engagement with the respective engagement track 42, 44th
  • the transfer device 16 establishes an operative connection between the cam carrier 14 and the gas exchange valves 20, 22.
  • the gas exchange valves 20, 22 are actuated (opened) when the first cam 32 or the second cam 34 presses the transfer device 16 downwards.
  • the transfer device 16 When the cam carrier 14 is in the first axial position, the transfer device 16 is operatively connected between the first cam 32 and the gas exchange valves 20, 22. In other words, the transfer device 16 is not operatively connected between the second in the first axial position of the cam carrier 14 Cam 34 and the gas exchange valves 20, 22. The gas exchange valves 20, 22 are actuated according to a contour of the first cam 32. In the second axial position of the cam carrier 14, the transfer device 16 is operatively connected between the second cam 34 and the gas exchange valves 20, 22, which are operated according to a contour of the second cam 34.
  • the transfer device 16 is formed as a drag lever. In other embodiments, the transfer device 16 may be formed as a rocker arm or plunger. In some embodiments, the transfer device 16 may include a cam follower, for example in the form of a rotatable roller.
  • the locking device 46 has an elastic element 48 and a blocking body 50.
  • the elastic element 48 is arranged in a blind hole of the camshaft 12.
  • the elastic member 48 biases the locking body 50 against the cam carrier 14.
  • first and second recesses 52 and 54 are arranged.
  • the blocking body 50 is, for example, pressed into the first recess 52 when the cam carrier 14 is in the first axial position.
  • the blocking body 50 is pressed into the second recess 54.
  • FIGS. 3 to 5 show by way of example the actuator 24 in greater detail.
  • the FIG. 3 shows the actuator 24 in a normal position (in the retracted state).
  • the FIG. 4 shows the actuator 24 during the working stroke (in the extended state).
  • the FIG. 5 shows the actuator 24 during a springback (when retracting).
  • the actuator 24 is fluid actuated.
  • the actuator 24 is a pneumatic or hydraulic actuator.
  • the actuator 24 is pneumatically actuated, as this may be advantageous in terms of temperature insensitivity and achievable speed.
  • the actuator 24 includes a slidable pin (piston) 56, an elastic member 58, a control fluid chamber 60, and a control fluid supply channel 62.
  • a control fluid for example air or hydraulic fluid, may be supplied to the control fluid chamber 60.
  • the delivery of control fluid to the control fluid chamber 60 causes the pin 56 to slide out of the control fluid chamber 60.
  • the extended pin 56 can engage the engagement track 42 to axially displace the cam carrier 14.
  • the pin 56 and the control fluid chamber 60 may be formed so that the control fluid chamber 60 is formed in the retracted state of the pin as an annular space.
  • the pin 56 may be provided with a pin as shown in FIGS FIGS. 3 to 5 is shown.
  • the annulus allows the control fluid to abut pin 56 at the beginning of actuation.
  • the fluid actuation of the actuator 24 allows, prior to engagement with the engagement track 42 (see FIG. 1 ) the pin 56 the cam-free portion 38 (see FIG. 1 ) passes over.
  • an outer peripheral surface of the cam-free portion 38 contacts the pin 56 and prevents the pin 56 from extending further.
  • the pin 56 can engage directly in the engagement track 42.
  • the control effort of the actuator 24 compared to systems that require a timely extension and meshing of the pin of the actuator can be significantly reduced. This may for example be the case with electromagnetically actuated actuators.
  • a ramp of the engagement track 42 pushes the pin 56 toward the control fluid chamber 60. If a compressible fluid is used as control fluid, the fluid is compressed and expelled upon insertion of the pin 56.
  • the fluid in the control fluid chamber 60 thus acts as a pneumatic spring during the insertion process of the pin 56.
  • the elastic member 58 causes a complete recovery of the pin 56 in the normal position (in the retracted state).
  • a fluid seal 64 for example a sealing ring, may be provided.
  • the control fluid space 60 may include, for example, a vent passage (not shown).
  • the sliding cam system 11 has a first actuator device 27, a second actuator device 127, a third actuator device 227, a fourth actuator device 327, a fifth actuator device 427 and a sixth actuator device 527.
  • the second to sixth actuator devices 127, 227, 327, 427, 527 can be designed like the actuator device 27.
  • the second to sixth actuator devices 127, 227, 327, 427, 527 respectively two actuators 124, 126; 224, 226; 324; 326; 424, 426 and 524, 526 for displacing a respective cam carrier (not shown).
  • the actuators 26, 124, 126, 224, 226, 324, 326, 424, 426, 524 and 526 may be as described with reference to FIGS FIGS. 3 to 5 be described actuator 24 is formed.
  • a fluid delivery device 66 In fluid communication upstream of the fluid actuated actuator devices 27, 127, 227, 327, 427, 527, a fluid delivery device 66 is provided.
  • the fluid supply device 66 is exemplified as a pneumatic fluid supply device.
  • the fluid delivery device 66 includes a compressor 68, a pressure tank 70, and four group control valves 72, 74, 76, and 78.
  • the compressor 68 delivers a fluid for storage in the pressure tank 70.
  • the compressor 68 may deliver air into the pressure tank 70.
  • the pressure tank 70 may in particular be a compressed air tank of a commercial vehicle which, for example, also provides compressed air for other pneumatic actuated devices of the commercial vehicle.
  • the pressure level may for example be between 8 bar and 12 bar.
  • the compressor 68 and the four group control valves 72, 74, 76 and 78 are controlled by a control unit 80.
  • the control unit 80 is connected to a position sensor 82, an engine sensor 84 and a user interface 86.
  • the position sensor 82 detects a position of the camshaft 12 (see FIG FIG. 1 ).
  • the engine sensor 84 detects at least one operating parameter of the internal combustion engine, for example, a parameter indicating a load of the internal combustion engine.
  • the user interface 86 enables user input to the control unit 80.
  • the control unit 80 controls operation of the compressor 68 and the four group control valves 72, 74, 46, and 78 based on signals received from the position sensor 82, the engine sensor 84, and the user interface 86.
  • the group control valves 72, 74, 76 and 78 are provided downstream of the compressor 68 and the pressure tank 70.
  • the first group control valve 72 is provided in fluid communication upstream of the actuators 24, 124, 224.
  • the second group control valve 74 is provided in fluid communication upstream of the actuators 26, 126, 226.
  • the third group control valve 76 is provided in fluid communication upstream of the actuators 324, 424, 524.
  • the fourth group control valve 78 is provided in fluid communication upstream of the actuators 326, 426, 526.
  • the group control valves 72, 74, 76 and 78 couple the Actuator devices 27, 127, 227, 327, 427 and 527 partially.
  • the first group control valve 72 must be opened by the control unit 80
  • the actuators 24, 26, 124, 126, 224, 226, 324, 326, 424 and 426 are divided into four groups for common operation via the group control valves 72, 74, 76 and 78. Within a group, the actuators are fluidically coupled. In other embodiments, more or less groups, each having more or fewer actuators, may be provided to reduce control effort for the sliding cam system.
  • the invention is not limited to the preferred embodiments described above. Rather, a variety of variants and modifications is possible, which also make use of the inventive idea and therefore fall within the scope.
  • the invention also claims protection of the subject matter and the features of the subclaims independently of the claims referred to.
  • the features of the subclaims are also disclosed independently of the features relating to the presence and the configuration of the fluid supply device and the fluid coupling of at least two actuator devices in the independent claim 1 originally.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
EP18188627.6A 2017-09-01 2018-08-13 Système de cames coulissantes Active EP3450708B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017120145.9A DE102017120145A1 (de) 2017-09-01 2017-09-01 Schiebenockensystem

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EP3450708A1 true EP3450708A1 (fr) 2019-03-06
EP3450708B1 EP3450708B1 (fr) 2020-12-30

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US (1) US10738665B2 (fr)
EP (1) EP3450708B1 (fr)
CN (1) CN109653823B (fr)
BR (1) BR102018017254B1 (fr)
DE (1) DE102017120145A1 (fr)

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Publication number Priority date Publication date Assignee Title
US10358954B2 (en) * 2017-05-03 2019-07-23 GM Global Technology Operations LLC Method of noise filtering a sliding camshaft actuator pin position output signal
US10961879B1 (en) * 2019-09-09 2021-03-30 GM Global Technology Operations LLC Sensor assembly for a sliding camshaft of a motor vehicle

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EP2487341A1 (fr) * 2009-10-06 2012-08-15 Yamaha Hatsudoki Kabushiki Kaisha Dispositif de commande de soupape pour moteur
WO2012152456A1 (fr) * 2011-05-10 2012-11-15 Schaeffler Technologies AG & Co. KG Moteur à combustion interne à piston alternatif équipé d'un dispositif de réglage de l'arbre à cames
DE102011104382A1 (de) * 2011-06-16 2012-12-20 Daimler Ag Brennkraftmaschinenventiltriebvorrichtung für ein Kraftfahrzeug

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DE19611641C1 (de) 1996-03-25 1997-06-05 Porsche Ag Ventiltrieb einer Brennkraftmaschine
JP3539182B2 (ja) * 1998-02-20 2004-07-07 トヨタ自動車株式会社 可変バルブタイミング装置
DE102004011586A1 (de) 2003-03-21 2004-10-07 Audi Ag Ventiltrieb einer einen Zylinderkopf aufweisenden Brennkraftmaschine
DE102007052254B4 (de) * 2007-11-02 2021-02-04 Daimler Ag Ventiltriebvorrichtung
DE102008029349A1 (de) * 2008-06-20 2009-12-24 Daimler Ag Ventiltriebvorrichtung
US7743749B1 (en) * 2009-07-21 2010-06-29 Ford Global Technologies, Llc Fuel pump drive system
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JP6509957B2 (ja) * 2017-06-30 2019-05-08 本田技研工業株式会社 内燃機関

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Publication number Priority date Publication date Assignee Title
DE202008008142U1 (de) * 2007-06-19 2008-10-30 Eto Magnetic Gmbh Elektromagnetische Stellvorrichtung
EP2487341A1 (fr) * 2009-10-06 2012-08-15 Yamaha Hatsudoki Kabushiki Kaisha Dispositif de commande de soupape pour moteur
WO2012152456A1 (fr) * 2011-05-10 2012-11-15 Schaeffler Technologies AG & Co. KG Moteur à combustion interne à piston alternatif équipé d'un dispositif de réglage de l'arbre à cames
DE102011104382A1 (de) * 2011-06-16 2012-12-20 Daimler Ag Brennkraftmaschinenventiltriebvorrichtung für ein Kraftfahrzeug

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RU2018131299A3 (fr) 2022-01-14
BR102018017254B1 (pt) 2024-02-06
US20190072009A1 (en) 2019-03-07
EP3450708B1 (fr) 2020-12-30
RU2018131299A (ru) 2020-03-02
BR102018017254A2 (pt) 2019-04-16
CN109653823B (zh) 2022-09-27
US10738665B2 (en) 2020-08-11
CN109653823A (zh) 2019-04-19
DE102017120145A1 (de) 2019-03-07

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