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WO2008030589A3 - Desmodromic valve system including single cam surface for closing and opening the valve - Google Patents

Desmodromic valve system including single cam surface for closing and opening the valve Download PDF

Info

Publication number
WO2008030589A3
WO2008030589A3 PCT/US2007/019593 US2007019593W WO2008030589A3 WO 2008030589 A3 WO2008030589 A3 WO 2008030589A3 US 2007019593 W US2007019593 W US 2007019593W WO 2008030589 A3 WO2008030589 A3 WO 2008030589A3
Authority
WO
WIPO (PCT)
Prior art keywords
valve
cam surface
cam
closing
opening
Prior art date
Application number
PCT/US2007/019593
Other languages
French (fr)
Other versions
WO2008030589A2 (en
WO2008030589B1 (en
Inventor
Jr Julian A Decuir
Original Assignee
Jr Julian A Decuir
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 Jr Julian A Decuir filed Critical Jr Julian A Decuir
Publication of WO2008030589A2 publication Critical patent/WO2008030589A2/en
Publication of WO2008030589A3 publication Critical patent/WO2008030589A3/en
Publication of WO2008030589B1 publication Critical patent/WO2008030589B1/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
    • F01L1/042—Cam discs
    • 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
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L1/30—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of positively opened and closed valves, i.e. desmodromic 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating 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
    • 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
    • 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
    • F01L2800/00—Methods of operation using a variable valve timing mechanism
    • F01L2800/06—Timing or lift different for valves of same cylinder

Landscapes

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

Abstract

A desmodromic valve and cam system is provided. The system may comprise a cam lobe mounted to a cam shaft and defining an effective cam surface. The system may also comprise a rocker mounted to a valve wherein the rocker pivots up and down in response to an input of the cam lobe to close and open the valve. More particularly, the effective cam surface of the cam lobe pushes up on the rocker follower surface to close the valve and pushes down on the rocker follower surface to open the valve.
PCT/US2007/019593 2006-09-08 2007-09-07 Desmodromic valve system including single cam surface for closing and opening the valve WO2008030589A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US84307406P 2006-09-08 2006-09-08
US60/843,074 2006-09-08

Publications (3)

Publication Number Publication Date
WO2008030589A2 WO2008030589A2 (en) 2008-03-13
WO2008030589A3 true WO2008030589A3 (en) 2008-06-26
WO2008030589B1 WO2008030589B1 (en) 2008-08-28

Family

ID=39157880

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/019593 WO2008030589A2 (en) 2006-09-08 2007-09-07 Desmodromic valve system including single cam surface for closing and opening the valve

Country Status (2)

Country Link
US (1) US20080060596A1 (en)
WO (1) WO2008030589A2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7878167B2 (en) 2007-08-24 2011-02-01 Decuir Jr Julian A Engine with round lobe
US7870842B2 (en) 2008-04-07 2011-01-18 Decuir Julian A Engine with desmodromically actuated rocker
US9366158B1 (en) 2010-12-22 2016-06-14 James T. Dougherty Unitary cam follower and valve preload spring for a desmodromic valve mechanism
US8622039B2 (en) 2010-12-22 2014-01-07 James T. Dougherty Rockerless desmodromic valve system
US9175581B2 (en) * 2013-08-20 2015-11-03 Ken Meyer Externally driven interior axial cam
KR101684562B1 (en) * 2015-12-11 2016-12-08 현대자동차 주식회사 Continuous varible vavle duration apparatus and engine provided with the same
KR101684558B1 (en) * 2015-12-14 2016-12-08 현대자동차 주식회사 Continuous varible vavle duration apparatus and engine provided with the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4723515A (en) * 1983-05-05 1988-02-09 Investment Rarities Incorporated Mechanism utilizing a single rocker arm for controlling an internal combustion engine valve
US6997152B2 (en) * 2002-04-29 2006-02-14 Delphi Technologies, Inc. Lock-pin cartridge for a valve deactivation rocker arm assembly
US7077088B1 (en) * 2005-05-25 2006-07-18 Decuir Jr Julian A Desmodromic valve retrofit system with replaceable cam lobes for adjusting duration and hydraulic lifters for reliability

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4858573A (en) * 1984-11-13 1989-08-22 Bothwell Peter W Internal combustion engines
EP0250397A1 (en) * 1985-11-29 1988-01-07 Lonrho Plc Arrangements for converting rotary motion to linear motion
US6311659B1 (en) * 1999-06-01 2001-11-06 Delphi Technologies, Inc. Desmodromic cam driven variable valve timing mechanism
US6945206B1 (en) * 2004-04-09 2005-09-20 George Wayne Mobley Lobe-less cam for use in a springless poppet valve system
US6948468B1 (en) * 2004-05-03 2005-09-27 Decuir Engine Technologies, Llc Desmodromic valve and adjustable cam system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4723515A (en) * 1983-05-05 1988-02-09 Investment Rarities Incorporated Mechanism utilizing a single rocker arm for controlling an internal combustion engine valve
US6997152B2 (en) * 2002-04-29 2006-02-14 Delphi Technologies, Inc. Lock-pin cartridge for a valve deactivation rocker arm assembly
US7077088B1 (en) * 2005-05-25 2006-07-18 Decuir Jr Julian A Desmodromic valve retrofit system with replaceable cam lobes for adjusting duration and hydraulic lifters for reliability

Also Published As

Publication number Publication date
US20080060596A1 (en) 2008-03-13
WO2008030589A2 (en) 2008-03-13
WO2008030589B1 (en) 2008-08-28

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