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WO2000057035A1 - Moyens d'actionnement d'une soupape hydraulique - Google Patents

Moyens d'actionnement d'une soupape hydraulique Download PDF

Info

Publication number
WO2000057035A1
WO2000057035A1 PCT/GB2000/001072 GB0001072W WO0057035A1 WO 2000057035 A1 WO2000057035 A1 WO 2000057035A1 GB 0001072 W GB0001072 W GB 0001072W WO 0057035 A1 WO0057035 A1 WO 0057035A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
fluid
drain
actuation means
cam
Prior art date
Application number
PCT/GB2000/001072
Other languages
English (en)
Inventor
Colin Andrews
Original Assignee
Csa Performance Ltd.
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 Csa Performance Ltd. filed Critical Csa Performance Ltd.
Priority to AU33117/00A priority Critical patent/AU3311700A/en
Publication of WO2000057035A1 publication Critical patent/WO2000057035A1/fr

Links

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
    • 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
    • F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column
    • 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
    • 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
    • F01L1/08—Shape of cams

Definitions

  • the present invention relates to an inlet and exhaust valve actuation
  • valves and exhaust valves. They are biassed towards the closed position by valve
  • cam is transmitted via a hydraulic fluid, typically engine oil, to the valve.
  • the hydraulic fluid is retained in an enclosed space. To ensure that the
  • Both the feed and leak path are usually dimensioned so that the
  • volume of fluid in the enclosed space remains substantially constant during
  • variable valve operation to enable the timing and for the degree of opening
  • valves to be varied to take account of engine operating conditions.
  • valve actuation means comprising a cam for providing a force, a hydraulic
  • hydraulic means further comprising a fluid feed through which fluid may be
  • the fluid drain is sufficiently dimensioned to allow the
  • volume of fluid in the enclosed space to be varied during valve operation
  • valve means by operation of the valve means. More preferably the hydraulic means and
  • fluid drain are arranged so that sufficient fluid may flow through the fluid
  • the hydraulic means is preferably arranged so that when the valve
  • the fluid feed preferably includes a non-return valve to prevent fluid
  • the fluid is preferably
  • the supply of fluid to the feed is preferably filtered.
  • the hydraulic means preferably includes a cam follower which may
  • the cam follower preferably comprises a
  • the piston is preferably disposed in a cylinder which is in
  • the cam follower is preferably
  • the valve actuator preferably also comprises a piston disposed in a
  • the valve actuator is preferably linked, directly or indirectly to a
  • valve the valve is preferably biassed towards a closed state.
  • the valve means is preferably electrically operated. More preferably
  • valve means is a solenoid operated spool valve. Alternatively, however, however
  • valve means could be mechanically operated.
  • Preferred types of valve have two states, open or closed, although
  • variable valves could be used
  • the valve means is preferably under the control of an electronic
  • control means which means is preferably an engine control unit (ECU).
  • ECU engine control unit
  • valve actuation means With the valve means closed, the valve actuation means will operate
  • valve means By opening the valve means at any time when an inlet or
  • exhaust valve is open, or about to be opened, the operation of the valve can
  • valve means By opening the valve means to allow hydraulic fluid to escape
  • valve operation can only be modified by allowing fluid to
  • valve could be
  • the fluid drain may comprise a drain port located in the cylinder in
  • valve actuator piston which the valve actuator piston is disposed.
  • a second fluid drain may also be provided, the second fluid drain comprising a drain port located in the cylinder in which the valve actuator
  • valve actuation means is preferably comprised in an internal
  • Figure 1 shows a simplified schematic view of a valve actuation means
  • Figures 2 show the valve actuation means of Figure 1 in various directions
  • Figure 17 shows a simplified schematic view of a modified version of the
  • Figure 18 shows an alternative modified version of the valve actuation
  • valve actuation means comprises a cam
  • cam profile provides a
  • the cam 2 is in contact with a cam follower 3.
  • the cam follower 3 is in contact with a cam follower 3.
  • the piston 5 is slidably mounted within a
  • cylinder 6 defined by a housing which also defines an enclosed space 7.
  • the cam follower 3 is biassed towards the cam 2 by a helical spring 8, to
  • the housing also defines a second cylinder 9 in which there is
  • valve actuator 10 which comprises a piston.
  • actuator 10 is connected to the stem of an engine valve 1 1 (the whole valve
  • the valve 1 1 could be an inlet or exhaust valve.
  • the valve 1 1 could be an inlet or exhaust valve.
  • valve 1 1 is biassed towards the closed
  • One cam follower could be used to drive
  • the enclosed space 7 forms a working chamber. Hydraulic oil,
  • oil feed 15 is supplied to the working chamber via an oil feed 15 by
  • the oil feed 15 includes a non ⁇
  • oil feed 15 could also include a filter and
  • the chamber 7 also includes an oil drain 17 closed by a spool valve
  • cam 2 may rotate without actuating the valve. For efficient operation the
  • chamber 7 must be free of air or other contaminants.
  • the solenoid 19 has a powerful, fast response and the valve 18 is
  • the solenoid 19 is under the control of an electronic engine
  • the actuation means enables the opening and closing of the inlet and
  • ECU electronic engine control unit
  • valve timing and lift It also offers the possibility of throttle-less operation
  • valve 16 is closed against the pressure build-up in chamber 7.
  • the follower piston 5 displaces a given volume of oil, moving
  • the engine valve 1 1 begins to open.
  • the engine valve 1 1 is at its maximum lift.
  • valve 1 1 is closed.
  • Figures 7 show a cycle of operation when an engine is operating at light
  • the engine valve 1 1 is closed.
  • valve 16 is closed against the pressure build-up in chamber 7.
  • the follower piston 5 displaces a given volume of oil, moving
  • the engine valve 1 1 begins to open.
  • the engine valve 1 1 begins to close.
  • Filtered oil is fed into chamber 7 via the non-return valve 16.
  • the oil flows through chamber 7 and straight out, through the
  • the engine valve 1 1 is
  • Figures 14 show a cycle of operation when an engine is operating with
  • the follower piston 5 displaces a
  • the engine valve 1 1 is closed.
  • the follower 3 maintains contact with the cam.
  • Filtered oil is fed into chamber 7 via the non-return valve. The oil flows through chamber 7 and straight out, through the open
  • the system uses a trapped volume of oil to open the engine valves.
  • This trapped volume is a variable, controlled by an ECU.
  • engine valve moves in time as a function of the timing of the opening
  • Figure 17 shows a possible modification to the valve actuation means
  • Tjie drain 21 is closed by means of a pressure
  • relief valve 22 arranged to allow fluid to pass out of the chamber via the
  • chamber 7 will effectively modify the cam profile, changing the relationship between duration and lift of the valve 1 1 .
  • drains 23,24 and 25 are provided from the working chamber. Each drain
  • ports are spaced apart in a direction parallel to the direction of movement
  • the port leading to drain 23 is located closest to the valve end 1 1 of
  • the apparatus requires a long duration rising ramp on the cam
  • Drain 23 could be provided as an alternative, or in addition to the
  • Drain 23 also permits greater valve control by allowing for full valve lift to be obtained for a long duration.
  • Ports for drains 24 and 25 are located at positions in the cylinder 9
  • Drains 24 and 25 are each closed by means of electrically
  • valves 26 The valves allow drains 24 and 25 to be brought into

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

L'invention concerne des moyens d'actionnement de la soupape (11) d'admission et d'échappement d'un moteur à combustion comprenant une came (1) fournissant une force et des moyens hydrauliques comportant un espace clos (7) afin de transmettre une force à un poussoir (10) par un liquide hydraulique contenu dans l'espace clos. Le liquide hydraulique est introduit dans l'espace clos (7) au moyen d'un alimenteur en liquides (15). On prévoit un canal (17) de drainage des liquides par le biais duquel les liquides peuvent s'écouler de l'espace clos (7). Un clapet est placé dans le canal de drainage des liquides pour contrôler l'écoulement des liquides dans les canaux de drainage. L'ouverture du clapet permet à une soupape activée par le poussoir d'être fermée plus rapidement que ce que permet la came.
PCT/GB2000/001072 1999-03-23 2000-03-21 Moyens d'actionnement d'une soupape hydraulique WO2000057035A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU33117/00A AU3311700A (en) 1999-03-23 2000-03-21 Hydraulic valve actuation means

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9906504.7 1999-03-23
GBGB9906504.7A GB9906504D0 (en) 1999-03-23 1999-03-23 Valve actuation means

Publications (1)

Publication Number Publication Date
WO2000057035A1 true WO2000057035A1 (fr) 2000-09-28

Family

ID=10850075

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2000/001072 WO2000057035A1 (fr) 1999-03-23 2000-03-21 Moyens d'actionnement d'une soupape hydraulique

Country Status (3)

Country Link
AU (1) AU3311700A (fr)
GB (1) GB9906504D0 (fr)
WO (1) WO2000057035A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1694945A4 (fr) * 2003-12-04 2009-12-16 Mack Trucks Systeme et procede pour la prevention de collision piston-soupape sur un moteur a combustion interne autre qu'a roue libre

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4278233A (en) * 1978-09-16 1981-07-14 Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft Arrangement for actuating gas-change valves
DE4132500A1 (de) * 1991-09-30 1993-04-01 Bosch Gmbh Robert Steuereinrichtung fuer gaswechselventile einer brennkraftmaschine
US5263441A (en) * 1989-11-25 1993-11-23 Robert Bosch Gmbh Hydraulic valve control apparatus for internal combustion engines
US5503120A (en) * 1995-01-18 1996-04-02 Siemens Automotive Corporation Engine valve timing control system and method
WO1997019260A1 (fr) * 1995-11-23 1997-05-29 William Richard Mitchell Systeme de mise en ×uvre de soupapes
WO1998034014A1 (fr) * 1997-02-04 1998-08-06 C.R.F. Societa' Consortile Per Azioni Moteur diesel a multiples cylindres avec actionnement de soupape variable

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4278233A (en) * 1978-09-16 1981-07-14 Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft Arrangement for actuating gas-change valves
US5263441A (en) * 1989-11-25 1993-11-23 Robert Bosch Gmbh Hydraulic valve control apparatus for internal combustion engines
DE4132500A1 (de) * 1991-09-30 1993-04-01 Bosch Gmbh Robert Steuereinrichtung fuer gaswechselventile einer brennkraftmaschine
US5503120A (en) * 1995-01-18 1996-04-02 Siemens Automotive Corporation Engine valve timing control system and method
WO1997019260A1 (fr) * 1995-11-23 1997-05-29 William Richard Mitchell Systeme de mise en ×uvre de soupapes
WO1998034014A1 (fr) * 1997-02-04 1998-08-06 C.R.F. Societa' Consortile Per Azioni Moteur diesel a multiples cylindres avec actionnement de soupape variable

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1694945A4 (fr) * 2003-12-04 2009-12-16 Mack Trucks Systeme et procede pour la prevention de collision piston-soupape sur un moteur a combustion interne autre qu'a roue libre
AU2004314703B2 (en) * 2003-12-04 2010-06-24 Mack Trucks, Inc. System and method for preventing piston-valve collision on a non-freewheeling internal combustion engine

Also Published As

Publication number Publication date
AU3311700A (en) 2000-10-09
GB9906504D0 (en) 1999-05-12

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