WO2004001199A3 - Improvements to latchable cam-lobe systems for poppet valve motion control - Google Patents

Improvements to latchable cam-lobe systems for poppet valve motion control Download PDF

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Publication number
WO2004001199A3
WO2004001199A3 PCT/GB2003/002594 GB0302594W WO2004001199A3 WO 2004001199 A3 WO2004001199 A3 WO 2004001199A3 GB 0302594 W GB0302594 W GB 0302594W WO 2004001199 A3 WO2004001199 A3 WO 2004001199A3
Authority
WO
WIPO (PCT)
Prior art keywords
cam
slideable
latching
camshaft
cams
Prior art date
Application number
PCT/GB2003/002594
Other languages
French (fr)
Other versions
WO2004001199A2 (en
Inventor
Jean-Pierre Pirault
Original Assignee
Powertrain Technology 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 Powertrain Technology Ltd filed Critical Powertrain Technology Ltd
Priority to EP03740744A priority Critical patent/EP1534938A2/en
Priority to AU2003277971A priority patent/AU2003277971A1/en
Publication of WO2004001199A2 publication Critical patent/WO2004001199A2/en
Publication of WO2004001199A3 publication Critical patent/WO2004001199A3/en

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
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/08—Shape of 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
    • F01L13/0036—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
    • F01L13/0057—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 splittable or deformable cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H53/00—Cams ; Non-rotary cams; or cam-followers, e.g. rollers for gearing mechanisms
    • F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
    • F16H53/04—Adjustable 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
    • F01L2301/00—Using particular materials
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

A camshaft assembly with one or several slideable camlobes, where each slideable cam (707) is capable of latching in 2 positions perpendicular to the main axis of the camshaft, so the slideable camlobe is either latched to provide the controlling valve lift, or the slideable camlobe is withdrawn within the lift curve of a pair of adjacent cams (712) and latched in this retracted position, so that these latter cams control the valve lift. The movable cam may comprise an upper cam (707) which performs the lifting of the valve, and a retaining cap or clip (708) which secures the upper cam (707) to the camshaft axle (706). The latching of the slideable cam to the cam axle can be achieved with at least one latching pin (702) which engages with holes (701 & 711) either in the slideable cam or a cam tube. The slideable cam is arranged so that the distance, on the centreline of the slideable cam, from the nose (800) of the slideable cam to the axis through the latching hole (701) for the inactive cam position, is less than the distance from the nose (801) of the fixed low lift cams to the centreline of the latching pin major axis (802).
PCT/GB2003/002594 2002-06-21 2003-06-17 Improvements to latchable cam-lobe systems for poppet valve motion control WO2004001199A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP03740744A EP1534938A2 (en) 2002-06-21 2003-06-17 Improvements to latchable cam-lobe systems for poppet valve motion control
AU2003277971A AU2003277971A1 (en) 2002-06-21 2003-06-17 Improvements to latchable cam-lobe systems for poppet valve motion control

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0214361.8 2002-06-21
GB0214361A GB2385888B (en) 2002-06-21 2002-06-21 Improvements to latchable cam lobe systems for poppet valve motion control

Publications (2)

Publication Number Publication Date
WO2004001199A2 WO2004001199A2 (en) 2003-12-31
WO2004001199A3 true WO2004001199A3 (en) 2004-03-04

Family

ID=9939054

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2003/002594 WO2004001199A2 (en) 2002-06-21 2003-06-17 Improvements to latchable cam-lobe systems for poppet valve motion control

Country Status (4)

Country Link
EP (1) EP1534938A2 (en)
AU (1) AU2003277971A1 (en)
GB (1) GB2385888B (en)
WO (1) WO2004001199A2 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100476165C (en) * 2003-06-02 2009-04-08 玛勒阀门有限公司 Camshaft, especially for an internal combustion engine, comprising shiftable cams
FR2891004B1 (en) * 2005-09-16 2011-03-25 Renault Sas DEVICE FOR ACTUATING A VALVE COMPRISING A DECENTRATED CAMBER SHAFT CARRYING A MOBILE CAM
GB2434404B (en) * 2006-01-18 2010-11-03 Powertrain Technology Ltd Improvements to variable valve actuation using slideable, latching cam lobes
GB0613727D0 (en) * 2006-07-11 2006-08-23 Powertrain Technology Ltd Improvements to 2-step variable timing mechanisms
EP2031194B1 (en) * 2007-08-28 2016-02-24 Perkins Engines Company Limited Assembled camshaft for exhaust gas recirculation system
DE102010012264B4 (en) 2010-03-22 2015-07-16 Assa Abloy Sicherheitstechnik Gmbh A door locking device
DE102012219453A1 (en) * 2012-10-24 2014-04-24 Mahle International Gmbh Multiple cam
JP5920177B2 (en) * 2012-11-14 2016-05-18 トヨタ自動車株式会社 Variable valve operating device for internal combustion engine
JP2014152694A (en) * 2013-02-07 2014-08-25 Toyota Motor Corp Variable valve gear for internal combustion engine
CN103967549A (en) * 2014-05-21 2014-08-06 中国第一汽车股份有限公司 One-cylinder multiple-cam combined type cam shaft
JP6070730B2 (en) 2015-01-15 2017-02-01 トヨタ自動車株式会社 Variable valve operating device for internal combustion engine
JP6252528B2 (en) 2015-03-19 2017-12-27 トヨタ自動車株式会社 Variable valve operating device for internal combustion engine
FR3117540B1 (en) * 2020-12-14 2022-12-16 Renault Camshaft of an internal combustion engine.

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4886022A (en) * 1988-01-06 1989-12-12 Mazda Motor Corporation Engine valve driving apparatus
US5404770A (en) * 1991-08-14 1995-04-11 Volkswagen Ag Variable cam arrangement for a lift valve
WO1995023912A1 (en) * 1994-03-03 1995-09-08 Christos Valasopoulos Variable action arrowhead shaped cam lobe system
US5746166A (en) * 1993-12-17 1998-05-05 Valasopoulos; Christos CAM lobe with offset angular movement
US5855190A (en) * 1996-09-24 1999-01-05 Yamaha Hatsudoki Kabushiki Kaisha Valve-actuating variable cam for engine
US5992265A (en) * 1996-11-01 1999-11-30 Eisengiesserei Monforts Gmbh & Co. Built-up camshaft
EP1172528A1 (en) * 2000-07-05 2002-01-16 Yamaha Hatsudoki Kabushiki Kaisha Valve drive device of four-stroke cycle engine
DE10030904A1 (en) * 2000-06-23 2002-01-31 Audi Ag Variable geometry camshaft for IC engine has radially adjustable cam segment to vary valve stroke

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4886022A (en) * 1988-01-06 1989-12-12 Mazda Motor Corporation Engine valve driving apparatus
US5404770A (en) * 1991-08-14 1995-04-11 Volkswagen Ag Variable cam arrangement for a lift valve
US5746166A (en) * 1993-12-17 1998-05-05 Valasopoulos; Christos CAM lobe with offset angular movement
WO1995023912A1 (en) * 1994-03-03 1995-09-08 Christos Valasopoulos Variable action arrowhead shaped cam lobe system
US5855190A (en) * 1996-09-24 1999-01-05 Yamaha Hatsudoki Kabushiki Kaisha Valve-actuating variable cam for engine
US5992265A (en) * 1996-11-01 1999-11-30 Eisengiesserei Monforts Gmbh & Co. Built-up camshaft
DE10030904A1 (en) * 2000-06-23 2002-01-31 Audi Ag Variable geometry camshaft for IC engine has radially adjustable cam segment to vary valve stroke
EP1172528A1 (en) * 2000-07-05 2002-01-16 Yamaha Hatsudoki Kabushiki Kaisha Valve drive device of four-stroke cycle engine

Also Published As

Publication number Publication date
GB0214361D0 (en) 2002-07-31
GB2385888B (en) 2004-05-05
EP1534938A2 (en) 2005-06-01
AU2003277971A1 (en) 2004-01-06
WO2004001199A2 (en) 2003-12-31
GB2385888A (en) 2003-09-03

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