US20090272346A1 - Continuous variable valve lift apparatus - Google Patents

Continuous variable valve lift apparatus Download PDF

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Publication number
US20090272346A1
US20090272346A1 US12/324,549 US32454908A US2009272346A1 US 20090272346 A1 US20090272346 A1 US 20090272346A1 US 32454908 A US32454908 A US 32454908A US 2009272346 A1 US2009272346 A1 US 2009272346A1
Authority
US
United States
Prior art keywords
camshaft
valve lift
variable valve
continuously variable
lift apparatus
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.)
Abandoned
Application number
US12/324,549
Other languages
English (en)
Inventor
Bosung Shin
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.)
Hyundai Motor Co
Kia Corp
Original Assignee
Hyundai Motor Co
Kia Motors Corp
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 Hyundai Motor Co, Kia Motors Corp filed Critical Hyundai Motor Co
Assigned to HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION reassignment HYUNDAI MOTOR COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHIN, BOSUNG
Publication of US20090272346A1 publication Critical patent/US20090272346A1/en
Abandoned 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • 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
    • F01L13/0042—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 being 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • 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
    • 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
    • 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
    • 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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the 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
    • F01L2013/0078—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 axially displacing the camshaft

Definitions

  • the present invention relates to a continuous variable valve lift apparatus, and more particularly to a continuous variable valve lift apparatus that can adjust a valve lift amount in response to an operational state of an engine
  • a typical combustion chamber of an automotive engine is provided with an intake valve for supplying an air/fuel mixture and an exhaust valve for expelling burned gas.
  • the intake and exhaust valves are opened and closed by a valve lift apparatus connected to a crankshaft.
  • a conventional valve lift apparatus has a fixed valve lift amount due to a fixed cam shape. Therefore, it is impossible to adjust the amount of gas that is being introduced or exhausted.
  • valve lift apparatus If the valve lift apparatus is designed for low driving speeds, the valve open time and amount are not sufficient for high speeds. On the other hand, if the valve lift apparatus is designed for high speeds, the opposite is true.
  • Various aspects of the present invention are directed to provide a continuous variable valve lift apparatus having increased operation range of valve lift and to provide a continuous variable valve lift apparatus that may realized with a small number of elements and may be reduced a total size thereof.
  • a continuously variable valve lift apparatus may include an input unit, a camshaft for receiving rotation from the input unit, wherein one end portion of the camshaft is slidably coupled to the input unit in a longitudinal direction of the camshaft, a controlling unit for controlling a relative position of the camshaft in the longitudinal direction of the camshaft, a slanted cam disposed to the camshaft and a cross-section of which is slanted with a predetermined angle with respect to a longitudinal axis of the camshaft, a mediating unit slanted with substantially the same angle of the slanted cam and pivoting in response to rotation of the slanted cam, and/or a valve opening unit that is opened/closed in response to the pivoting motion of the mediating unit.
  • the input unit may include a camshaft sprocket slidably coupled to the one end portion of the camshaft, and/or an elastic member disposed between the camshaft sprocket and the camshaft and supplying restoring force to the camshaft toward the controlling unit.
  • the elastic member may be a spring.
  • the one end portion of the camshaft may have a shape of an oval cross-section, a polygon, or a spline.
  • the camshaft may include a cam connecting portion formed at the one end portion of the camshaft to be slidably coupled to the camshaft sprocket.
  • the cam connecting portion may have a shape of an oval cross-section, a polygon, or a spline.
  • the input unit may further include a front journal connected to the camshaft sprocket, and the camshaft are slidably coupled to the front journal in the longitudinal direction of the camshaft.
  • the one end portion of the camshaft may have a shape of an oval cross-section, a polygon, or a spline.
  • the camshaft may include a cam connecting portion formed at the one end portion of the camshaft to be slidably coupled to the front journal of the input unit.
  • the cam connecting portion may have a shape of an oval cross-section, a polygon, or a spline.
  • the controlling unit may include an eccentric cam that contacts the other end portion of the camshaft for controlling the relative position of the camshaft. Rotation angle of the eccentric cam may be controlled by a control unit.
  • the mediating unit may include a rocker shaft disposed in parallel to the camshaft, and/or a rocker lever rotatably coupled to the rocker shaft and slidably contacting the slanted cam.
  • the rocker lever may be biased toward the camshaft by an elastic member.
  • the elastic member may be a spring.
  • the rocker lever may include a slanted portion slidably contacting the slanted cam, and/or an output portion slidably contacting the valve opening unit.
  • the output portion may include a lift section that generates valve lift in response to pivoting of the rocker lever, and/or a zero lift section that does not generate the valve lift, allowing pivoting of the rocker lever.
  • FIG. 1 is a perspective view of an exemplary continuously variable valve lift apparatus according to the present invention.
  • FIG. 2 is a front view of an exemplary continuously variable valve lift apparatus according to the present invention.
  • FIG. 3 is a drawing showing some elements of an exemplary continuously variable valve lift apparatus according to the present invention.
  • FIG. 4 is a drawing showing an operation of an exemplary continuously variable valve lift apparatus according to the present invention in low lift mode.
  • FIG. 5 is a drawing showing an operation of an exemplary continuously variable valve lift apparatus according to an the present invention in high lift mode.
  • FIG. 6 is a graph showing an exemplary profile characteristic of a variable valve lift apparatus according to an the present invention.
  • FIG. 1 and FIG. 2 are a perspective view and a front view respectively of a continuously variable valve lift apparatus according to an exemplary embodiment of the present invention.
  • FIG. 3 is a drawing showing main elements of a continuously variable valve lift apparatus according to an exemplary embodiment of the present invention.
  • a variable valve lift apparatus includes an input unit 100 that receives a torque, a camshaft 200 that receives rotation force from the input unit 100 and is movably disposed along a longitudinal direction thereof, and a controlling unit 300 for controlling a relative position of the camshaft 200 along the longitudinal direction thereof.
  • a slanted cam 210 is disposed to the camshaft 200 , wherein a cross-section the slanted cam 210 is slanted along the longitudinal direction of the camshaft 200 . That is, the slanted cam 210 is preferably formed as a crushed and truncated cone.
  • Rotation force of the slanted cam 210 is transmitted to a mediating unit 400 which is slanted and pivots by the slanted cam 210 , and then to a valve opening unit 500 in response to pivoting of the mediating unit 400 .
  • the input unit 100 includes a front journal 120 , and the camshaft 200 and the front journal 120 are slidably coupled along the longitudinal direction with respect to each other and transmit rotation to the camshaft 200 .
  • a front journal connecting portion 125 and a camshaft connecting portion 205 are formed to connect to each other, and the front journal connecting portion 125 and the camshaft connecting portion 205 may transmit rotation of the input unit 100 and may be slidably movable along a longitudinal direction with respect to each other.
  • front journal connecting portion 125 and the camshaft connecting portion 205 are described as being oval, however, they are not limited to the described shape.
  • General polygon or a spline can be used for the front journal connecting portion 125 and the camshaft connecting portion 205 .
  • one end portion of the camshaft 200 may be formed to be oval, polygon, or a spline so that the end portion of the camshaft 200 can be slidably coupled to the front journal 120 without the camshaft connecting portion 205 .
  • the input unit 100 further includes a camshaft sprocket 110 and an elastic member 130 that is disposed between the camshaft sprocket 110 and the front journal 120 for supplying a restoring force to the camshaft 200 .
  • the controlling unit 300 includes an eccentric cam 310 that contacts the other end portion of the camshaft 200 for controlling a relative position of the camshaft 200 in a longitudinal direction thereof.
  • the eccentric cam 310 is controlled by an ECU (electronic control unit; not shown) that detects and determines operation states of an engine, and operations of the ECU and angle change of the eccentric cam 310 can be adjusted in accordance with performance requirements of an engine. Operations of an engine and angle change of the eccentric cam 310 can be variable according to performance requirements of an engine and can be realized by a person skilled in the art referring to the detailed description, so a detailed explanation will be omitted.
  • ECU electronic control unit
  • the mediating unit 400 includes a rocker shaft 410 in parallel to the camshaft 200 and a rocker lever 420 that is pivotally coupled to the rocker shaft 410 .
  • the rocker lever 420 may be biased toward the camshaft 200 by an elastic member 450 disposed at the rocker shaft 410 .
  • the rocker lever 420 includes a slanted portion 422 contacting the slanted cam 210 and an output portion 424 contacting the valve opening unit 500 .
  • the output portion 424 includes a lift section 426 that generates valve lift to the valve opening unit 500 in response to pivoting of the rocker lever 420 and a zero lift section 428 that does not generates valve lift, allowing pivoting of the rocker lever.
  • valve 510 is opened, but when the zero lift section 428 contacts the valve opening unit 500 , the valve 510 is not opened.
  • FIG. 4 is a drawing showing operation of a continuously variable valve lift apparatus according to an exemplary embodiment of the present invention in low lift mode
  • FIG. 5 is a drawing showing operation of a continuously variable valve lift apparatus according to an exemplary embodiment of the present invention in high lift mode.
  • the lift mode and lift timing depend on inclination ratio of the slanted cam 210 and the slanted portion 422 of the rocker lever 420 and an eccentric rate of the eccentric cam 310 as explained hereinafter.
  • the eccentric cam 310 rotates for the camshaft 200 to be more distant from the slanted portion 422 of the rocker lever 420 . Accordingly the distance between the camshaft 200 and a contact point of the slanted cam 210 and the rocker lever 420 is decreased such that the rocker lever 420 pivots in the clockwise direction in FIG. 2 . Due to the clockwise pivoting motion, the zero lift section 428 of the rocker lever 420 comes in contact with the valve opening unit 500 . Therefore, the valve lift and lift timing of the valve 510 are reduced.
  • the eccentric cam 310 rotates for the slanted cam 210 of the camshaft 200 to be close to slanted portion 422 of the rocker lever 420 .
  • the eccentric cam 310 rotates for the slanted cam 210 of the camshaft 200 to be close to the slanted portion 422 of the rocker lever 420 . Accordingly the distance between the camshaft 200 and a contact point of the slanted cam 210 and the rocker lever 420 is increased such that the rocker lever 420 pivots in the counterclockwise direction in FIG. 2 . Due to the counterclockwise pivoting motion, the lift section 426 of the rocker lever 420 comes in contact with the valve opening unit 500 . Therefore, the valve lift and lift timing of the valve 510 are increased.
  • the time that the zero lift section 428 contacts the valve opening unit 500 is reduced and the time that the lift section 426 contacts the valve opening unit 500 is increased.
  • FIG. 6 is a graph showing a profile characteristic of a variable valve lift apparatus according to an exemplary embodiment of the present invention.
  • the continuously variable valve lift apparatus may realize an optimal valve profile with simple operations of the eccentric cam and inclination of the slanted cam and slanted portion.
  • a simple design change of the output portion 424 may realize CDA (cylinder deactivation) mode. Accordingly the continuously variable valve lift apparatus according to an exemplary embodiment of the present invention may reduce production cost and maintain cost with a simple structure and a small number of elements.
  • the entire size of the continuously variable valve lift apparatus according to an exemplary embodiment of the present invention may be reduced with a compact scheme.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
US12/324,549 2008-04-30 2008-11-26 Continuous variable valve lift apparatus Abandoned US20090272346A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2008-0040846 2008-04-30
KR1020080040846A KR20090114947A (ko) 2008-04-30 2008-04-30 연속 가변 밸브 리프트 장치

Publications (1)

Publication Number Publication Date
US20090272346A1 true US20090272346A1 (en) 2009-11-05

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Family Applications (1)

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US12/324,549 Abandoned US20090272346A1 (en) 2008-04-30 2008-11-26 Continuous variable valve lift apparatus

Country Status (5)

Country Link
US (1) US20090272346A1 (de)
JP (1) JP2009270563A (de)
KR (1) KR20090114947A (de)
CN (1) CN101571062B (de)
DE (1) DE102008063337A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8776739B2 (en) 2010-10-08 2014-07-15 Pinnacle Engines, Inc. Internal combustion engine valve actuation and adjustable lift and timing
CN103228877A (zh) * 2010-10-08 2013-07-31 品纳科动力有限公司 内燃机阀门驱动和可调节的升程及定时
CN102182529A (zh) * 2011-05-24 2011-09-14 奇瑞汽车股份有限公司 一种可变升程凸轮轴

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4494506A (en) * 1982-02-03 1985-01-22 Mazda Motor Corporation Intake system for an internal combustion engine
US5367991A (en) * 1993-03-23 1994-11-29 Mazda Motor Corporation Valve operating system of engine
US5445117A (en) * 1994-01-31 1995-08-29 Mendler; Charles Adjustable valve system for a multi-valve internal combustion engine
US5832889A (en) * 1996-05-13 1998-11-10 Toyota Jidosha Kabushiki Kaisha Valve driving apparatus
US6298813B1 (en) * 1999-10-08 2001-10-09 Toyota Jidosha Kabushiki Kaisha Variable valve apparatus of internal combustion engine

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Publication number Priority date Publication date Assignee Title
DE3025259A1 (de) * 1973-05-18 1981-01-15 Nissan Motor Ventilbetaetigungsmechanismus
JPS63253107A (ja) * 1987-04-06 1988-10-20 Tatsuya Nakazawa 内燃機関の吸・排気弁リフトタイミング可変装置
JP3992000B2 (ja) * 2004-02-19 2007-10-17 日産自動車株式会社 内燃機関の吸排気バルブ温度推定装置及びバルブクリアランス量推定装置
JP2007046459A (ja) * 2005-08-05 2007-02-22 Otics Corp 可変動弁機構
CN1814992A (zh) * 2006-03-10 2006-08-09 王雪松 连续可变气门正时配气机构活塞式内燃机
CN1851242A (zh) * 2006-04-14 2006-10-25 江门市硕普科技开发有限公司 一种发动机连续可变气门相位驱动装置
CN100410502C (zh) * 2006-04-14 2008-08-13 江门市硕普科技开发有限公司 一种发动机自适应气门相位装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4494506A (en) * 1982-02-03 1985-01-22 Mazda Motor Corporation Intake system for an internal combustion engine
US5367991A (en) * 1993-03-23 1994-11-29 Mazda Motor Corporation Valve operating system of engine
US5445117A (en) * 1994-01-31 1995-08-29 Mendler; Charles Adjustable valve system for a multi-valve internal combustion engine
US5832889A (en) * 1996-05-13 1998-11-10 Toyota Jidosha Kabushiki Kaisha Valve driving apparatus
US6298813B1 (en) * 1999-10-08 2001-10-09 Toyota Jidosha Kabushiki Kaisha Variable valve apparatus of internal combustion engine

Also Published As

Publication number Publication date
KR20090114947A (ko) 2009-11-04
CN101571062B (zh) 2013-06-05
JP2009270563A (ja) 2009-11-19
DE102008063337A1 (de) 2009-11-05
CN101571062A (zh) 2009-11-04

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AS Assignment

Owner name: KIA MOTORS CORPORATION, KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SHIN, BOSUNG;REEL/FRAME:021906/0125

Effective date: 20081121

Owner name: HYUNDAI MOTOR COMPANY, KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SHIN, BOSUNG;REEL/FRAME:021906/0125

Effective date: 20081121

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION