EP0179581A2 - Ventilantrieb mit variablen Steuerzeiten - Google Patents

Ventilantrieb mit variablen Steuerzeiten Download PDF

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Publication number
EP0179581A2
EP0179581A2 EP85306982A EP85306982A EP0179581A2 EP 0179581 A2 EP0179581 A2 EP 0179581A2 EP 85306982 A EP85306982 A EP 85306982A EP 85306982 A EP85306982 A EP 85306982A EP 0179581 A2 EP0179581 A2 EP 0179581A2
Authority
EP
European Patent Office
Prior art keywords
camshaft
shaft
valve timing
cams
camshafts
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.)
Withdrawn
Application number
EP85306982A
Other languages
English (en)
French (fr)
Other versions
EP0179581A3 (de
Inventor
Graham Ernest Atkin
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.)
Rover Co Ltd
Original Assignee
Rover Co 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 Rover Co Ltd filed Critical Rover Co Ltd
Publication of EP0179581A2 publication Critical patent/EP0179581A2/de
Publication of EP0179581A3 publication Critical patent/EP0179581A3/de
Withdrawn legal-status Critical Current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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/356—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear making the angular relationship oscillate, e.g. non-homokinetic 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
    • F01L1/047—Camshafts
    • F01L2001/0475—Hollow camshafts

Definitions

  • This invention relates to variable valve timing mechanisms for internal combustion engines.
  • the opening and closing of exhaust and inlet valves can be varied to achieve certain desired advantages. For example, increased power at high speeds can be obtained by advancing the opening and delaying the closing of inlet valves, and by advancing the opening of the exhaust valves. At low speeds, delaying the opening of the exhaust valves to reduce valve overlap achieves the same effect while also reducing exhaust emissions.
  • United Kingdom Patent Specification No. 1 522 405 describes one prior proposal for varying the valve timing.
  • proposal separate camshafts are provided for each cylinder and they are driven eccentrically with variable eccentricity to vary the valve timing.
  • the camshaft drive is provided by a gear located between the centre two camshafts, which results in an undesirable increase in the height of the valve gear cover.
  • United Kingdom Patent Specification No. 2 066 361 describes another proposal for varying the valve timing.
  • separate camshafts for each cylinder are coupled to a driveshaft which runs the length of the cylinder head through the hollow camshafts and which is movable in a translational sense to drive the camshafts whith varying eccentricity.
  • the camshaft is driven by a gear located outside the valve gear cover so that the height of the valve gear cover can be reduced since the driving gear is not within the valve gear cover but the means coupling the camshafts to the driveshaft nevertheless adds to the length of the cylinder head.
  • the invention provides a variable valve timing mechanism for an internal combustion engine comprising a valve actuating cam on a rotatably mounted hollow camshaft, and a shaft for driving the camshaft, which shaft extends through the hollow camshaft and is movable in a translational sense relative to the axis of rotation of the cam, the shaft having a lateral projection so coupled to the cam lobe as to drive the camshaft with varying amounts of eccentricity as the shaft is moved, in order to vary the valve timing.
  • cam lobes as part of the means coupling the drive shaft and individual camshafts permits a reduction in the length of the cylinder head while still enabling the height of the valve gear cover to be reduced compared to the first prior proposal referred to above.
  • the camshaft carries two cams, and the bearing for the camshaft is located between the two cams.
  • each camshaft could have a single cam for varying the timing of a single valve (inlet or exhaust), preferably each camshaft carries two cams, either for operating both an inlet and an exhaust valve, or for operating a pair of exhaust valves. In the latter case, additional separate camshafts could be provided for each cylinder so that there is one for a pair of inlet valves and one for a pair of exhaust valves.
  • a slot in the cam lobe or preferably in the lateral projection which slot is engaged by a slider connected to the cam lobe or lateral projection, respectively, which transmits the drive in a rotary direction while allowing the necessary radial relative movement to take place freely.
  • the lateral projection may be on an arm which extends from a sleeve fixed on the shaft.
  • the sleeve may have projections at each end, each connected to a cam lobe for a valve of a different cylinder.
  • the invention is applicable to spark ignition or compression ignition engines.
  • the engine is a four cylinder in-line engine with two inlet valves and two exhaust valves per cylinder.
  • a variable valve timing camshaft mechanismm is provided for all the inlet valves and a separate variable valve timing camshaft mechanism is provided for all the exhaust valves.
  • the mechanism for the inlet valves commprises a drive shaft indicated generally by the reference numeral 1, hollow camshafts for two adjacent cylinders indicated generally by the reference numerals 2, 3, and an intermediate driving member indicated generally by the reference numeral 4 for driving the camshafts from the drive shaft.
  • the cam lobes of the camshafts operate tappets (not shown) in the usual way.
  • the drive shaft has a serrated portion 5, and the interior of the intermediate driving member 4 is also internally serrated at 6, so keying the two together.
  • the intermediate driving member 4 consists of a sleeve 7 bearing the internal serrations and two integral lateral projections 8, 9 which extend radially from the shaft 1.
  • the sleeve 7 is mounted in a bearing 10 which is movable by means to be described hereinafter in the direction of the arrows 11, 12.
  • Each hollow camshaft 2, 3 has an internal diameter wide enough to allow the lateral movement of the driving shaft 1 to take place.
  • Each has a pair of identical cam lobes 13, 14 respectively (the lobes 14 are not visible in the drawings) and each is rotatably mounted in a fixed bearing housing 15, 16 respectively.
  • the cam lobes 13, 14 are coupled respectively to the lateral projections 8, 9 by pin and slot couplings, only one of which is shown in the drawings.
  • the cam lobe 13 has pin 17 pressed into an aperture in it, which pin engages in aperture 18 in a square-sectioned slider 19 which is freely slideable in a radial slot 20 recessed in one face of lateral projection 8, ( Figure 3).
  • the slider 19 can oscillate relative to the pin 17 about the axis of the pin 17.
  • the bearing housing 10 is mounted in a pivotable housing 21.
  • a fixed shaft 22 runs through an aperture in one end of the housing, and a notch 23 is cut out of the other end.
  • the notch 23 containing an eccentric 24 mounted on a fixed shaft 25.
  • the housing 10 moves in the direction of the arrows 11, 12 when the shaft 25 is turned and the eccentric acts on the notch.
  • the drive shaft 1 is driven at one end (not shown) by means of a pulley driven by a belt.
  • lateral projections 8, 9 of the intermediate driving member 4 lie within the profiles of the cam lobes 13, 14, thereby permitting the use of bucket tappets.
  • the intermediate driving member 4 is made of metal; the slider 19 may be of metal or of synthetic material.
  • a third intermediate driving member could be provided between the centre two cylinders so that camshaft 3 could be driven by an appropriate pin and lateral projection at each lobe, instead of only at one lobe as illustrated. If desired each cam lobe of each camshaft could be driven by a separate pin in order to reduce stresses on the camshaft.
  • cam lobes could act via rockers if desired.
  • variable valve timing mechanism could be provided for inlet valves only, or for exhaust valves only, and is applicable to a single inlet or a single exhaust valve per cylinder as well as to pairs thereof.
  • camshafts 2, 3 bearing pairs of inlet, or exhaust cams for each cylinder they may each bear one inlet and one exhaust valve for a respective cylinder, that is, two valves per cylinder.
  • the invention is applicable to compression injection as well as to spark ignition engines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP85306982A 1984-10-20 1985-09-30 Ventilantrieb mit variablen Steuerzeiten Withdrawn EP0179581A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8426603 1984-10-20
GB08426603A GB2165885B (en) 1984-10-20 1984-10-20 I c engine variable valve timing mechanism

Publications (2)

Publication Number Publication Date
EP0179581A2 true EP0179581A2 (de) 1986-04-30
EP0179581A3 EP0179581A3 (de) 1987-04-22

Family

ID=10568513

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85306982A Withdrawn EP0179581A3 (de) 1984-10-20 1985-09-30 Ventilantrieb mit variablen Steuerzeiten

Country Status (4)

Country Link
EP (1) EP0179581A3 (de)
JP (1) JPS61118510A (de)
ES (1) ES8704583A1 (de)
GB (1) GB2165885B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988008919A1 (en) * 1987-05-14 1988-11-17 National Research Development Corporation Improvements in or relating to driving connections between two rotatable bodies
EP0428278A1 (de) * 1989-11-15 1991-05-22 Jaguar Cars Limited Vorrichtungen für Drehbewegungen
WO1992006282A1 (en) * 1990-10-01 1992-04-16 British Technology Group Ltd Improvements in or relating to driving connections between two rotatable bodies
WO1995028555A1 (de) * 1994-04-18 1995-10-26 Korostenski, Erwin Brennkraftmaschine mit variabler ventilsteuerung
WO1996023963A1 (de) * 1995-01-30 1996-08-08 Erwin Korostenski Brennkraftmaschine
DE10306154A1 (de) * 2003-02-14 2004-08-26 Bayerische Motoren Werke Ag Ventiltrieb für eine Brennkraftmaschine
DE102006005333B4 (de) 2006-02-07 2021-12-16 Bayerische Motoren Werke Aktiengesellschaft Ventiltrieb für eine Brennkraftmaschine

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4771742A (en) * 1986-02-19 1988-09-20 Clemson University Method for continuous camlobe phasing
GB8620416D0 (en) * 1986-08-22 1986-10-01 Stidworthy F M Differential camshafts
GB8923181D0 (en) * 1989-10-13 1989-11-29 Rover Group An internal combustion engine
US5365896A (en) * 1992-06-17 1994-11-22 Unisia Jecs Corporation Cam shaft assembly for use in internal combustion engine
JPH062516A (ja) * 1992-06-17 1994-01-11 Unisia Jecs Corp 内燃機関の吸排気弁駆動制御装置
GB2275096B (en) * 1993-02-15 1996-05-22 Unisia Jecs Corp Valve control device for internal combustion device
JPH07102914A (ja) * 1993-03-03 1995-04-18 Peter Amborn 相互に位置決めされる軸要素を備えたカム軸構体およびその製造方法
US5417186A (en) * 1993-06-28 1995-05-23 Clemson University Dual-acting apparatus for variable valve timing and the like
JP3286420B2 (ja) * 1993-09-28 2002-05-27 株式会社ユニシアジェックス 内燃機関の吸排気弁駆動制御装置
GB9523742D0 (en) * 1995-11-21 1996-01-24 Mitchell Stephen W Valve timing phase changer
JP3603273B2 (ja) * 1998-09-07 2004-12-22 本田技研工業株式会社 シリンダブロックアッセンブリとミッションアッセンブリとの組み付け方法
GB2365508A (en) * 2000-08-08 2002-02-20 Mechadyne Internat Plc Variable valve timing mechanism
US7104229B2 (en) 2001-04-05 2006-09-12 Stephen William Mitchell Variable valve timing system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2261413A1 (en) * 1974-02-20 1975-09-12 Baguena Michel Four stroke engine with variable timing - has cams with controlled variable angular relationship to camshaft
GB2066361A (en) * 1980-01-02 1981-07-08 Nat Res Dev Valve timing mechanisms of internal combustion engines

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1311562A (en) * 1969-06-27 1973-03-28 Ass Eng Ltd Device for moving a cam relative to its driving shaft
GB1522405A (en) * 1976-04-02 1978-08-23 Mitchell S Valve timing mechanisms
DE3046402C2 (de) * 1980-12-10 1984-08-09 Audi Nsu Auto Union Ag, 7107 Neckarsulm Vorrichtung zum Abschalten einzelner Zylinder einer mehrzylindrigen Hubkolben-Brennkraftmaschine
GB2133465A (en) * 1982-12-24 1984-07-25 Ford Motor Co I.c. engine camshaft drive mechanism

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2261413A1 (en) * 1974-02-20 1975-09-12 Baguena Michel Four stroke engine with variable timing - has cams with controlled variable angular relationship to camshaft
GB2066361A (en) * 1980-01-02 1981-07-08 Nat Res Dev Valve timing mechanisms of internal combustion engines

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988008919A1 (en) * 1987-05-14 1988-11-17 National Research Development Corporation Improvements in or relating to driving connections between two rotatable bodies
GB2206179A (en) * 1987-05-14 1988-12-29 Nat Res Dev Improvements in or relating to driving connections between two rotatable bodies
US4872428A (en) * 1987-05-14 1989-10-10 National Research Development Corporation Improvements in or relating to driving connections between two rotatable bodies
GB2206179B (en) * 1987-05-14 1991-01-09 Nat Res Dev Improvements in or relating to driving connections between two rotatable bodies
EP0428278A1 (de) * 1989-11-15 1991-05-22 Jaguar Cars Limited Vorrichtungen für Drehbewegungen
US5080053A (en) * 1989-11-15 1992-01-14 Jaguar Cars Limited Rotary drives
WO1992006282A1 (en) * 1990-10-01 1992-04-16 British Technology Group Ltd Improvements in or relating to driving connections between two rotatable bodies
US5417611A (en) * 1990-10-01 1995-05-23 British Technology Group Limited Driving connections between two rotatable bodies
WO1995028555A1 (de) * 1994-04-18 1995-10-26 Korostenski, Erwin Brennkraftmaschine mit variabler ventilsteuerung
WO1996023963A1 (de) * 1995-01-30 1996-08-08 Erwin Korostenski Brennkraftmaschine
US5975037A (en) * 1995-01-30 1999-11-02 Korostenski; Erwin Internal combustion engine
DE10306154A1 (de) * 2003-02-14 2004-08-26 Bayerische Motoren Werke Ag Ventiltrieb für eine Brennkraftmaschine
DE102006005333B4 (de) 2006-02-07 2021-12-16 Bayerische Motoren Werke Aktiengesellschaft Ventiltrieb für eine Brennkraftmaschine

Also Published As

Publication number Publication date
JPS61118510A (ja) 1986-06-05
EP0179581A3 (de) 1987-04-22
GB2165885B (en) 1987-12-23
ES8704583A1 (es) 1987-04-01
ES547998A0 (es) 1987-04-01
GB2165885A (en) 1986-04-23
GB8426603D0 (en) 1984-11-28

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Inventor name: ATKIN, GRAHAM ERNEST