US20120079999A1 - Variable valve lift apparatus - Google Patents

Variable valve lift apparatus Download PDF

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Publication number
US20120079999A1
US20120079999A1 US13/168,514 US201113168514A US2012079999A1 US 20120079999 A1 US20120079999 A1 US 20120079999A1 US 201113168514 A US201113168514 A US 201113168514A US 2012079999 A1 US2012079999 A1 US 2012079999A1
Authority
US
United States
Prior art keywords
latching pin
tappet
cylinder head
variable valve
valve lift
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
US13/168,514
Other languages
English (en)
Inventor
Chang Ho Yang
Byong Young Choi
Gee Wook Shin
Yoonsick Woo
Jin Kook Kong
Soo Hyung Woo
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 KIA MOTORS CORPORATION, HYUNDAI MOTOR COMPANY reassignment KIA MOTORS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHOI, BYONG YOUNG, KONG, JIN KOOK, SHIN, GEE WOOK, WOO, SOO HYUNG, WOO, YOONSIK, YANG, CHANG HO
Publication of US20120079999A1 publication Critical patent/US20120079999A1/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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead 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
    • 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

Definitions

  • the present invention relates to a variable valve lift apparatus, and more particularly, to a variable valve lift apparatus with a stopper that is inserted into an outer tappet to limit movement of a latching pin and projects to the outside of the outer tappet and slides in a cylinder head groove to prevent the variable valve lift apparatus from being rotated.
  • an optimal operation of the intake valve/exhaust valve depends on a rotational velocity of an engine. That is, an appropriate lift or valve opening/closing time depends on the rotational velocity of the engine.
  • VVL variable valve lift
  • FIG. 9 is a cross-sectional view of a variable tappet in a high lift mode of a known variable valve lift apparatus and
  • FIG. 10 is a cross-sectional view of a variable tappet in a low lift mode of a known variable valve lift apparatus.
  • a high cam 12 is joined to a cam shaft 10 , such that the high cam 12 presses the outer tappet 100 by rotation of the cam shaft 10 , and as a result, the outer tappet 100 and the inner tappet 200 integrally move up and down. That is, high lift is executed by rotational movement of the high cam 12 .
  • the oil pressure of the hydraulic chamber 240 formed in the outer tappet 100 is released and the latching pin 310 moves with being separated from the latching pin joining groove 340 by a restoring force of a return spring 330 , as shown in FIG. 10 .
  • the inner tappet 200 and the outer tappet 100 are separated from each other by the movement of the latching pin 310 and independently move.
  • a latching pin supporting pin 320 supports the return spring 330 and is inserted into the inner tappet 200 .
  • the valve is opened and closed by the inner tappet 200 that reciprocates by rotation of a low cam 14 joined to the cam shaft 10 and the outer tappet 100 merely moves up and down by a lost motion spring 500 (see FIG. 4 ) depending on the rotation of the high cam 12 and has no influence on the opening and closing of the valve.
  • variable tappets 100 and 200 of the variable valve lift apparatus do not coincide with each other, respectively, the variable tappets 100 and 200 rotate, and as a result, the engine is damaged.
  • variable valve lift apparatus since a working fluid can be supplied only when positions of a supply hole of the working fluid actuating the variable valve lift apparatus and a working fluid supplying hole of a bore of a cylinder head coincide with each other, an additional rotation preventing device for preventing rotation of the entire variable valve lift apparatus is required.
  • Various aspects of the present invention are directed to providing a variable valve lift apparatus with a stopper capable of limiting movement of a latching pin while allowing cams and tappet surfaces of the variable valve lift apparatus to coincide with each other by preventing the variable valve lift apparatus from being rotated.
  • a variable valve lift apparatus including an inner tappet, an outer tappet surrounding and slidably contacting the inner tappet, and a latching pin slidably inserted into the inner tappet so as to implement a high lift and a low lift by selectively joining the inner tappet and the outer tappet, may include a stopper partially inserted into the outer tappet and spaced apart from the latching pin in a movement direction of the latching pin so as to limit movement of the latching pin, and forming a latching pin joining groove in the outer tappet to selectively receive the latching pin, wherein the stopper partially projects to the outside of the outer tappet and may be slidably engaged to a cylinder head groove formed to a cylinder head bore to prevent the variable valve lift apparatus from being rotated.
  • the stopper may include an insertion portion having substantially the same diameter as the latching pin and being inserted into the outer tappet to limit the movement of the latching pin, and a projection portion projecting from the insertion portion to the outside of the outer tappet and having a shape to be slidably inserted into the cylinder head groove in order to prevent the variable valve lift apparatus from being rotated.
  • the projection portion may have a semi-spherical shape which may be slidable while contacting the cylinder head groove.
  • the projection portion may have a semi-cylindrical shape formed in a movement direction of the outer tappet and slides while contacting the cylinder head groove.
  • a through-hole may be formed in the stopper and fluid-connected to the latching pin joining groove to smoothly discharge oil pressure supplied to actuate the latching pin.
  • the insertion portion may have a cylindrical shape having the same radius as the latching pin.
  • FIG. 1 is a longitudinal cross-sectional view of a variable tappet according to an exemplary embodiment of the present invention.
  • FIG. 2 is a plan view of a variable tappet according to an exemplary embodiment of the present invention.
  • FIG. 3 is a perspective view of a state in which inner and outer tappets are partially cut according to an exemplary embodiment of the present invention.
  • FIG. 4 show a use state diagram before and after a variable valve lift apparatus according to an exemplary embodiment of the present invention is joined to a cylinder head and an enlarged diagram of a principal part.
  • FIG. 5 is a perspective view of a variable tappet according to various exemplary embodiments of the present invention.
  • FIG. 6A to 6D are a perspective view, a plan view, a side view, and a front view of a stopper according to various exemplary embodiments of the present invention.
  • FIG. 7 is a perspective view of a variable tappet according to various exemplary embodiments of the present invention.
  • FIGS. 8A to 8D are a perspective view, a plan view, a side view, and a front view of a variable tappet according to various exemplary embodiments of the present invention.
  • FIG. 9 is a cross-sectional view of a variable tappet in a high lift mode of a known variable valve lift apparatus.
  • FIG. 10 is a cross-sectional view of a variable tappet in a low lift mode of a known variable valve lift apparatus.
  • FIG. 1 is a longitudinal cross-sectional view of a variable tappet of a state in which a stopper is joined to the variable tappet according to an exemplary embodiment of the present invention
  • FIG. 2 is a plan view of a variable tappet according to an exemplary embodiment of the present invention.
  • FIG. 3 is a perspective view of a state in which inner and outer tappets are partially cut according to an exemplary embodiment of the present invention
  • FIG. 4 is a use state diagram before and after a variable valve lift apparatus according to an exemplary embodiment of the present invention is joined to a cylinder head
  • FIG. 5 is a perspective view of a variable tappet according to a first exemplary embodiment of the present invention
  • FIG. 6A to 6D are a perspective view, a plan view, a side view, and a front view of a stopper according to a first exemplary embodiment of the present invention.
  • a stopper 400 that is provided to be spaced apart from a latching pin 310 at one upper side of an outer tappet 100 in a movement direction of the latching pin 310 is provided in the outer tappet 100 .
  • the latching pin 310 may be partially a hollow body and have a cylindrical shape.
  • a latching pin supporting pin 320 limiting movement of the latching pin 310 while penetrating the latching pin 310 is joined to an inner tappet 200 .
  • a return spring 330 that restores the latching pin 310 to an original state when oil pressure is released, while contacting the latching pin supporting pin 320 , is inserted into the latching pin 310 .
  • the stopper 400 includes an insertion portion 410 having the same shape as the latching pin 310 to limit horizontal movement of the latching pin 310 and a projection portion 420 having a similar shape to a plan cross section of a groove 110 to slide while projecting to the outside of the outer tappet 100 and contacting an inner circumference of the groove 110 of a cylinder head.
  • the insertion portion 410 may be a cylindrical shape having the same radius as the latching pin 310 .
  • an auxiliary latching pin 370 pushes the latching pin 310 by oil pressure supplied at the time when the oil pressure is supplied through a hydraulic chamber 360 and the latching pin 310 in the inner tappet 200 moves to one inner side of the outer tappet 100 , such that the inner tappet 200 and the outer tappet 100 are joined to each other.
  • a distance in which the latching pin 310 can move is limited to a movement limiting distance A.
  • the latching pin 310 selectively joins the outer tappet 100 and the inner tappet 200 while moving in a horizontal direction in order to control a valve lift, thereby implementing a high lift or a low lift.
  • the latching pin 310 may move excessively.
  • the latching pin 310 should move only within the movement limiting distance A in which the latching pin 310 can move.
  • the stopper 400 serves to such a function.
  • the projection portion 420 that projects to the outside of the outer tappet 100 is engaged in the groove 110 , and as a result, the variable valve lift apparatus may move up and down without rotating. Therefore, since surfaces of the inner and outer tappets 100 and 200 coincide with a high cam 12 and a low cam 12 in a rotational direction, it is possible to prevent an engine from being damaged.
  • FIG. 4 shows a use state diagram showing a state in which the stopper 400 according to the exemplary embodiment of the present invention is positioned in a cylinder head groove with being partially exposed to the outer tappet 100 and an enlarged diagram of a principal part.
  • a left side of FIG. 5 shows a state in which a tappet is inserted into a bore of a known cylinder head and a right side of FIG. 5 shows a state in which the stopper 400 according to the exemplary embodiment of the present invention is inserted into the cylinder head groove 110 .
  • the enlarged diagram of the principal part shows a state in which the stopper 400 is engaged in the cylinder head groove 110 .
  • the projection portion 420 of the stopper 400 should have a structure to slide on an inner circumference of the cylinder head groove in order to prevent the variable valve lift apparatus from being rotated. That is, when a plan cross section of the inner circumference of the cylinder head groove 110 has a semi-spherical shape, a plan cross section of the projection portion 420 should also have the semi-spherical shape.
  • the plan cross section of the projection portion 420 may have the semi-spherical shape. Further, since the projection portion 420 should slide on the inner circumference of the cylinder head groove 110 , the projection portion 420 may have a semi-cylindrical shape that is long in a vertical direction which is a movement direction, as shown in FIGS. 5 and 6 .
  • a through-hole 430 is formed at the center of the stopper 400 by passing through the insertion portion 410 and the projection portion 420 . The formation of the through-hole 430 is to easily discharge the oil pressure after actuating the latching pin 310 to the outside.
  • a projection portion 460 may have a semi-spherical shape.
  • an insertion portion 450 has a cylindrical shape as shown in FIG. 7 , and since the insertion portion 450 has a through-hole 470 formed at the center thereof as described in the first exemplary embodiment, the insertion portion 450 has a structure to easily discharge preused oil pressure.
  • the stopper 400 is manufactured as described in the second exemplary embodiment, the stopper 400 can be more easily manufactured than the stopper 400 in the first exemplary embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
US13/168,514 2010-09-30 2011-06-24 Variable valve lift apparatus Abandoned US20120079999A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020100095559A KR101209736B1 (ko) 2010-09-30 2010-09-30 가변 밸브 리프트 장치
KR10-2010-0095559 2010-09-30

Publications (1)

Publication Number Publication Date
US20120079999A1 true US20120079999A1 (en) 2012-04-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US13/168,514 Abandoned US20120079999A1 (en) 2010-09-30 2011-06-24 Variable valve lift apparatus

Country Status (4)

Country Link
US (1) US20120079999A1 (zh)
KR (1) KR101209736B1 (zh)
CN (1) CN102444442B (zh)
DE (1) DE102011051431A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104100325A (zh) * 2013-04-10 2014-10-15 重庆长安汽车股份有限公司 两级可变气门升程装置
EP2853698B1 (en) * 2013-09-27 2016-06-01 Aktiebolaget SKF Cam follower, injection pump and valve actuator comprising such a cam follower and manufacturing method

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5553584A (en) * 1993-12-24 1996-09-10 Honda Giken Kogyo Kabushiki Kaisha Valve operating device for internal combustion engine
US5782216A (en) * 1994-10-15 1998-07-21 Ina Walzlager Schaeffler Kg Engageable tappet for a valve drive of an internal combustion engine
US6135074A (en) * 1996-10-16 2000-10-24 Ina Walzlager Schaeffler Ohg Tappet for the valve gear mechanism of an internal combustion engine
US6196175B1 (en) * 1999-02-23 2001-03-06 Eaton Corporation Hydraulically actuated valve deactivating roller follower
US6397804B1 (en) * 2000-08-11 2002-06-04 Mazda Motor Corporation Valve drive mechanism for engine
US20020124823A1 (en) * 2001-03-07 2002-09-12 Christof Faria Valve train of an internal combustion engine comprising a switchable, rotationally symmetrical component
US20030154942A1 (en) * 2000-04-10 2003-08-21 Makoto Hirano Valve gear of internal combustion engine
US7143731B2 (en) * 2004-05-25 2006-12-05 Ina-Schaeffler Kg Cup tappet of a valve train of an internal combustion engine
US7210437B2 (en) * 2004-07-24 2007-05-01 Ina-Schaeffler Kg Periodically actuable tappet for a valve train or a pump drive
US7484488B2 (en) * 2005-11-25 2009-02-03 Eaton Corporation Dual valve lift blip with single cam lobe for gasoline engines

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2753197A1 (de) * 1976-12-15 1978-06-22 Eaton Corp Ventilsteuervorrichtung
US5697333A (en) * 1997-02-20 1997-12-16 Eaton Corporation Dual lift actuation means
US6591798B2 (en) * 2001-12-17 2003-07-15 Delphi Technologies, Inc. Variable valve actuation assembly for an internal combustion engine
DE10252991A1 (de) * 2002-11-14 2004-05-27 Bayerische Motoren Werke Ag Schwenkaktor-Vorrichtung zur Hubsteuerung eines Gaswechselventils im Zylinderkopf einer Brennkraftmaschine
CA2704990A1 (en) 2007-11-07 2009-05-14 Vertex Pharmaceuticals Incorporated Processes and intermediates for producing aminobenzimidazole ureas

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5553584A (en) * 1993-12-24 1996-09-10 Honda Giken Kogyo Kabushiki Kaisha Valve operating device for internal combustion engine
US5782216A (en) * 1994-10-15 1998-07-21 Ina Walzlager Schaeffler Kg Engageable tappet for a valve drive of an internal combustion engine
US6135074A (en) * 1996-10-16 2000-10-24 Ina Walzlager Schaeffler Ohg Tappet for the valve gear mechanism of an internal combustion engine
US6196175B1 (en) * 1999-02-23 2001-03-06 Eaton Corporation Hydraulically actuated valve deactivating roller follower
US20030154942A1 (en) * 2000-04-10 2003-08-21 Makoto Hirano Valve gear of internal combustion engine
US6854432B2 (en) * 2000-04-10 2005-02-15 Honda Giken Kogyo Kabushiki Kaisha Valve gear of internal combustion engine
US6397804B1 (en) * 2000-08-11 2002-06-04 Mazda Motor Corporation Valve drive mechanism for engine
US20020124823A1 (en) * 2001-03-07 2002-09-12 Christof Faria Valve train of an internal combustion engine comprising a switchable, rotationally symmetrical component
US6474279B2 (en) * 2001-03-07 2002-11-05 Ina-Schaeffler Kg Valve train of an internal combustion engine comprising a switchable, rotationally symmetrical component
US7143731B2 (en) * 2004-05-25 2006-12-05 Ina-Schaeffler Kg Cup tappet of a valve train of an internal combustion engine
US7210437B2 (en) * 2004-07-24 2007-05-01 Ina-Schaeffler Kg Periodically actuable tappet for a valve train or a pump drive
US7484488B2 (en) * 2005-11-25 2009-02-03 Eaton Corporation Dual valve lift blip with single cam lobe for gasoline engines

Also Published As

Publication number Publication date
CN102444442B (zh) 2015-08-12
DE102011051431A1 (de) 2012-04-05
KR101209736B1 (ko) 2012-12-07
CN102444442A (zh) 2012-05-09
KR20120033832A (ko) 2012-04-09

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HYUNDAI MOTOR COMPANY, KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YANG, CHANG HO;CHOI, BYONG YOUNG;SHIN, GEE WOOK;AND OTHERS;REEL/FRAME:026497/0172

Effective date: 20110615

Owner name: KIA MOTORS CORPORATION, KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YANG, CHANG HO;CHOI, BYONG YOUNG;SHIN, GEE WOOK;AND OTHERS;REEL/FRAME:026497/0172

Effective date: 20110615

STCB Information on status: application discontinuation

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