GB2298899A - I.c.engine valve gear - Google Patents

I.c.engine valve gear Download PDF

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Publication number
GB2298899A
GB2298899A GB9605415A GB9605415A GB2298899A GB 2298899 A GB2298899 A GB 2298899A GB 9605415 A GB9605415 A GB 9605415A GB 9605415 A GB9605415 A GB 9605415A GB 2298899 A GB2298899 A GB 2298899A
Authority
GB
United Kingdom
Prior art keywords
rocker arm
valve drive
drive according
cam
valve
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.)
Granted
Application number
GB9605415A
Other versions
GB9605415D0 (en
GB2298899B (en
Inventor
Uwe Hoyer
Harald Unger
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of GB9605415D0 publication Critical patent/GB9605415D0/en
Publication of GB2298899A publication Critical patent/GB2298899A/en
Application granted granted Critical
Publication of GB2298899B publication Critical patent/GB2298899B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • F01L13/0021—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 rocker arm ratio
    • 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

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

Description

is Valve drive for an internal combustion engine 2298899 The present
invention relates to a valve drive for an internal combustion engine comprising a second rocker arm operating on a lifting valve, a first rocker arm associated with the second rocker arm, a cam associated with the first rocker arm and an adjustable eccentric, which is arranged on an eccentric shaft, whereby the rocker arms, the cam and the eccentric operate together in order that for different positions of the eccentric, different valve lifting sequences are achieved by the action of the cam.
A valve drive of this construction is proposed in DE-A-43 26 331. The aim of the present invention is to provide a simple construction for such a valve drive.
Accordingly, the present invention is directed to a valve drive as described in the opening paragraph of the present specification which comprises second rocker arm operating on the lifting valve, a first rocker arm associated with the second rocker arm, a cam associated with the first rocker arm and an adjustable eccentric, which is arranged on an eccentric shaft, whereby the rocker arms, the cam and the eccentric operate together in order that for different positions of the eccentric, different valve lifting sequences are achieved by the action of the cam, in which the first rocker arm, supported on the eccentric, is guided by the eccentric shaft.
Preferably, the first rocker arm is guided by the 2 eccentric shaft and reaches round a section of the eccentric shaft with its free end.
Advantageously, eccentrics are arranged on both sides of the section enclosed by the first rocker arm, on which eccentrics the first rocker arm supports itself by means of lugs which are provided on its side faces.
In a preferred embodiment the first rocker arm bearing on the eccentric is controlled by the cam and thereby activates the second rocker arm which operates on the lifting valve.
Preferably, the first rocker arm controlled by the cam carries a roller on each of its side faces on each of which a cam operates.
Advantageously, the second rocker arm is formed in a forked shape and operates two parallel working valves of an internal combustion engine cylinder.
In a preferred embodiment, a roller is positioned between the two f ork arms of the second rocker arm, on which roller the first rocker arm operates.
Preferably, a spring element formed as a torsion cylindrical helical coiled spring supports the positioning of the first rocker arm.
An example of a valve drive for an internal combustion engine made in accordance with the present invention, will now be described with reference to the accompanying drawings, in which; Figure 1 shows a cross-sectional view of an internal combustion engine cylinder head with a valve drive; Figure 2 shows a perspective view of the 3 valve drive; and Figure 3 shows a perspective view of the drive in Figure 2 from the other side.
In a cylinder head 1 in an internal combustion engine, an inlet valve 3 is positioned alongside an exhaust valve 2, both of which are operated by a valve drive mechanism 4.
In detail, a so-called second rocker arm 5, which is positioned in a ball socket 6 and carries a roller 7 on which a so-called first rocker 8 operates, acts on the free end of the valve 3.
The f irst rocker arm 8 is supported at its end opposite to rocker arm 5 by an eccentric 9. A cam 10 also operates on the first rocker arm 8. At a defined position of the eccentric 9 the valve 3 is opened as normal in accordance with a defined valve lifting sequenc e. During this the cam 10, rotating on its axis, controls the first rocker arm 8 in a certain manner such that this controlling movement is transmitted via the roller 7 to the second rocker arm 5 and from this to the valve 3. If the eccentric 9 now takes up a different position, then the position of the first rocker arm 8 changes, so that a different valve lifting sequence comes about for the valve 3.
The internal combustion engine shown in the accompanying drawings, with cylinder head 1 is an in-line internal combustion engine, in which several cams 10 are arranged on a common cam shaft 101 for the several internal combustion engine cylinders which are arranged one behind is - 4 the other. In a similar manner several eccentrics 9 are arranged on a common eccentric shaft 91. Whilst the second rocker arm 5 is positioned in the ball socket 6, a suitable positioning or control must be provided for the first rocker arm 8. In the construction described herein the first rocker arm 8 is controlled by the eccentric shaft 91. This can best be seen in the illustrations in Figures 2 and 3, which show that the free end of this first rocker arm 8 partially reaches round a segment of the eccentric shaft 9r. Preferably the first rocker arm 8 is guided by the eccentric shaft 91, and no separate component is required for guiding; rather it is possible for the first rocker arm 8 to fall back on the eccentric shaft 91, which is available in any case because of there being several eccentrics 9.
Similarly, it can be seen from Figures 2 and 3, that there are eccentrics 9 arranged on both sides of the segment of the eccentric shaft 91 enclosed by the first rocker arm 8, against which the f irst rocker arm 8 is supported using the protrusions or lugs 11 which are provided on the side edges of the first rocker arm 8. With an equal distribution of forces, this arrangement leads to an extremely stable positioning and guidance of the first rocker arm 8 by the eccentric shaft 91 and the eccentrics 9. In a comparable fashion two cams 10 are provided which act on the first rocker arm 8, and which must obviously as Must the two eccentrics 9 - be of the same configuration. The two cams 10 operate via rollers 12 on the first rocker arm 8, therefore, the first rocker arm 8 - 5 carries on both sides a roller 12 of this construction.
The valve drive described herein is especially suited to the operation of two parallel working lifting valves 3 of an internal combustion engine cylinder, in coordination with the available building space. The second rocker arm 5, which is operated by the first rocker arm 8, can (as shown) be formed as a fork and it can then operate upon a lifting valve 3 with each of its fork arms 5'. With the advantage that the roller 7, on which the first rocker arm travels, is positioned between the two fork arms 51.
Furthermore, a spring element 13, formed as a torsion cylindrical helical coiled spring, can be seen in all the Figures, which supports the positioning of the first rocker arm 8. Thus, the spring element 13 ensures that the f irst rocker arm 8 is, on the one hand pressed against the cam 10 by its rollers 12 and on the other hand, at the end opposite to the second rocker arm 5, is guided by the eccentric shaft 91, and supports itself at this end against the two eccentrics 9.
6 claims is 1. A valve drive for an internal combustion engine comprising a second rocker arm operating on a lifting valve, a f irst rocker arm associated with the second rocker arm, a cam associated with the first rocker arm and an adjustable eccentric, which is arranged on an eccentric shaft, whereby the rocker arms, the cam and the eccentric operate together in order that for different positions of the eccentric, different valve lifting sequences are achieved by the action of the cam, in which the f irst rocker arm, supported on the eccentric, is guided by the eccentric shaft.

Claims (1)

  1. 2. A valve drive according to Claim 1, in which the f irst rocker arm is
    guided by the eccentric shaft and reaches round a section of the eccentric shaft with its free end.
    3. A valve drive according to Claim 2, in which eccentrics are arranged on both sides of the section enclosed by the first rocker arm, on which eccentrics the first rocker arm supports itself by means of protrusions which are provided on its side faces.
    4. A valve drive according to any preceding Claim, in which the first rocker arm bearing on the eccentric is controlled by the cam and thereby activates the second rocker arm which operates on the lifting valve.
    5. A valve drive according to any preceding Claim, in which the first rocker arm controlled by the cam carries a roller on each of its side faces on each of which a cam is 7 - operates.
    6. A valve drive according to any preceding Claim, in which the second rocker arm is formed in a forked shape and operates two parallel working valves of an internal combustion engine cylinder.
    7. A valve drive according to any preceding Claim, in which a roller is positioned between the two fork arms of the second rocker arm, on which roller the first rocker arm operates.
    8. A valve drive according to any preceding Claim, in which a spring element formed as a torsion cylindrical helical coiled spring supports the positioning of the first rocker arm.
    9. A valve drive for an internal combustion engine substantially as described herein with reference to the accompanying drawings.
GB9605415A 1995-03-16 1996-03-14 Valve drive for an internal combustion engine Expired - Fee Related GB2298899B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1995109604 DE19509604A1 (en) 1995-03-16 1995-03-16 Valve train of an internal combustion engine

Publications (3)

Publication Number Publication Date
GB9605415D0 GB9605415D0 (en) 1996-05-15
GB2298899A true GB2298899A (en) 1996-09-18
GB2298899B GB2298899B (en) 1998-10-14

Family

ID=7756883

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9605415A Expired - Fee Related GB2298899B (en) 1995-03-16 1996-03-14 Valve drive for an internal combustion engine

Country Status (3)

Country Link
DE (1) DE19509604A1 (en)
FR (1) FR2731744B1 (en)
GB (1) GB2298899B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6907852B2 (en) 2001-05-12 2005-06-21 Bayerische Motoren Werke Ag Valve operating device for variable stroke adjustment of a charge exchange valve of an internal combustion engine
EP1710403A1 (en) * 2004-01-30 2006-10-11 HONDA MOTOR CO., Ltd. Engine
EP1710402A1 (en) * 2003-12-18 2006-10-11 Toyota Jidosha Kabushiki Kaisha Variable valve mechanism
CN1322227C (en) * 2001-07-17 2007-06-20 泰森克鲁普汽车股份公司 Variable valve-stroke controller
EP1365116A3 (en) * 2002-05-24 2007-12-12 Delphi Technologies, Inc. Variable valve actuating mechanism having torsional lash control spring
EP2096274A1 (en) * 2006-12-18 2009-09-02 Toyota Jidosha Kabushiki Kaisha Internal combustion engine with variable actuation valve mechanism

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19629881A1 (en) * 1996-07-24 1998-01-29 Bayerische Motoren Werke Ag Valve train of an internal combustion engine with rocker arms supported on an eccentric shaft
DE19708484B4 (en) * 1997-03-03 2006-07-13 Bayerische Motoren Werke Ag Device for changing the Ventilhubverlaufes a lift valve, in particular a gas exchange valve of internal combustion engines
DE10006015B4 (en) * 2000-02-11 2009-09-17 Schaeffler Kg Variable valve drive for load control of a spark-ignited internal combustion engine
DE10052811A1 (en) 2000-10-25 2002-05-08 Ina Schaeffler Kg Variable valve train for load control of a spark ignition internal combustion engine
WO2003014537A1 (en) 2001-08-06 2003-02-20 Christian Heier Valve control on a reciprocating piston engine (vvst)
DE10214802A1 (en) * 2002-04-04 2003-10-16 Thyssen Krupp Automotive Ag Guide systems for variable valve controls
DE10228022B4 (en) 2002-06-20 2009-04-23 Entec Consulting Gmbh Valve lifting device for stroke adjustment of the gas exchange valves of an internal combustion engine
DE10235400A1 (en) * 2002-08-02 2004-02-19 Bayerische Motoren Werke Ag Cylinder head for an internal combustion engine with a variable stroke valve train
DE10239908A1 (en) * 2002-08-30 2004-02-26 Audi Ag Variable valve gear for reciprocating piston internal combustion engines has cams each operating lift valve via roller packet both of which are commonly movable along adjustment ramp commonly constructed in common slide component
DE10239909A1 (en) * 2002-08-30 2004-02-26 Audi Ag Variable valve gear especially for reciprocating piston internal combustion engine has adjustment ramp and pre-acceleration ramp forming guide sections of one-sided guide face of slide component for guiding of roller packet
DE10261304B4 (en) * 2002-12-27 2009-01-22 BÖSL-FLIERL, Gerlinde Valve lift device for variable valve control of the gas exchange valves of an internal combustion engine
DE10312961C5 (en) * 2003-03-24 2009-01-29 Thyssenkrupp Presta Teccenter Ag Device for the variable actuation of gas exchange valves of internal combustion engines
DE102004001343A1 (en) * 2004-01-08 2005-09-01 Entec Consulting Gmbh Variable valve lift device for internal combustion engine, has rotatable eccentric shaft having eccentrics contours positioned within circle formed by external diameter of bearings of eccentric shaft
DE10342075A1 (en) 2003-09-10 2005-06-16 Rolf Jung Fully variable globe valve control of an internal combustion engine
DE10354428A1 (en) * 2003-11-21 2005-06-23 Bayerische Motoren Werke Ag Management system for IC engine especially during cold starting has the opening time of the inlet valve reduced and with retarded timing
DE102005047040A1 (en) * 2005-09-30 2007-04-05 Mtu Friedrichshafen Gmbh Variable valve controller for V-engine, has lower oscillating arms adjusted around central cam shaft by displacement of guide shafts using actuator that is driven around regulating shaft, where arms are movably coupled with inlet valve
KR100969074B1 (en) * 2008-04-14 2010-07-09 현대자동차주식회사 Continuous variable valve lift device
DE102011003898B4 (en) 2011-02-10 2021-09-09 Schaeffler Technologies AG & Co. KG Intermediate lever
DE102011082226A1 (en) * 2011-09-07 2013-03-07 Bayerische Motoren Werke Aktiengesellschaft Double leg spring for a variable-stroke valve drive in a cylinder head of an internal combustion engine
CN103925035B (en) * 2013-01-15 2016-06-08 长城汽车股份有限公司 A kind of swing arm regulates frame
DE102016201118A1 (en) * 2016-01-27 2017-07-27 Schaeffler Technologies AG & Co. KG Anti-rotation compensation device on a camshaft drive with camshaft-parallel spring
DE102016220397A1 (en) * 2016-10-18 2017-08-10 Schaeffler Technologies AG & Co. KG Intermediate lever of a variable valve train
DE102016220396A1 (en) * 2016-10-18 2017-08-10 Schaeffler Technologies AG & Co. KG Intermediate lever of a variable valve train
DE102016220394B3 (en) * 2016-10-18 2017-12-28 Schaeffler Technologies AG & Co. KG Intermediate lever of a variable valve train
DE102016220401A1 (en) * 2016-10-18 2017-09-07 Schaeffler Technologies AG & Co. KG Intermediate lever of a variable valve train
DE102016223087A1 (en) * 2016-11-23 2017-10-26 Schaeffler Technologies AG & Co. KG Intermediate lever of a variable valve train

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US5373818A (en) * 1993-08-05 1994-12-20 Bayerische Motoren Werke Ag Valve gear assembly for an internal-combustion engine

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DE2629554A1 (en) * 1976-07-01 1978-01-12 Daimler Benz Ag Charge regulator for mixture compression engine - has valve actuator lever moved by cam with adjustable rotation centre
JPS6226562Y2 (en) * 1981-03-10 1987-07-08
IT1157983B (en) * 1982-12-23 1987-02-18 Fiat Auto Spa KINEMATIC DEVICE FOR THE CONTROL OF A VALVE OF AN ENDOTHERMAL MOTOR
DE3615449A1 (en) * 1986-05-07 1987-11-12 Erich Schmid Device for a cam-controlled reciprocating piston engine
DE4112833A1 (en) * 1990-12-19 1992-06-25 Audi Ag Variable valve control for IC engine gas exchange valve - has two parallel levers fitted between camshaft cam and valve sheet
DE4326331A1 (en) * 1992-07-15 1995-02-09 Bayerische Motoren Werke Ag Valve gear of an internal combustion engine
DE4229411A1 (en) * 1992-09-03 1994-03-10 Bayerische Motoren Werke Ag Rocker arms for pair of engine lift valves - form triangular shape with connecting bar, and has guide fixed to connecting bar

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Publication number Priority date Publication date Assignee Title
US5373818A (en) * 1993-08-05 1994-12-20 Bayerische Motoren Werke Ag Valve gear assembly for an internal-combustion engine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6907852B2 (en) 2001-05-12 2005-06-21 Bayerische Motoren Werke Ag Valve operating device for variable stroke adjustment of a charge exchange valve of an internal combustion engine
CN1322227C (en) * 2001-07-17 2007-06-20 泰森克鲁普汽车股份公司 Variable valve-stroke controller
EP1365116A3 (en) * 2002-05-24 2007-12-12 Delphi Technologies, Inc. Variable valve actuating mechanism having torsional lash control spring
EP1710402A1 (en) * 2003-12-18 2006-10-11 Toyota Jidosha Kabushiki Kaisha Variable valve mechanism
EP1710402A4 (en) * 2003-12-18 2009-11-11 Toyota Motor Co Ltd Variable valve mechanism
EP1710403A1 (en) * 2004-01-30 2006-10-11 HONDA MOTOR CO., Ltd. Engine
EP1710403A4 (en) * 2004-01-30 2008-12-17 Honda Motor Co Ltd Engine
US7523727B2 (en) 2004-01-30 2009-04-28 Honda Motor Co., Ltd. Engine
EP2096274A1 (en) * 2006-12-18 2009-09-02 Toyota Jidosha Kabushiki Kaisha Internal combustion engine with variable actuation valve mechanism
EP2096274A4 (en) * 2006-12-18 2012-01-04 Toyota Motor Co Ltd Internal combustion engine with variable actuation valve mechanism

Also Published As

Publication number Publication date
GB9605415D0 (en) 1996-05-15
FR2731744B1 (en) 1997-12-19
DE19509604A1 (en) 1996-09-19
FR2731744A1 (en) 1996-09-20
GB2298899B (en) 1998-10-14

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Legal Events

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20140314