EP0925427B1 - Dekompressionsautomatik - Google Patents
Dekompressionsautomatik Download PDFInfo
- Publication number
- EP0925427B1 EP0925427B1 EP97944826A EP97944826A EP0925427B1 EP 0925427 B1 EP0925427 B1 EP 0925427B1 EP 97944826 A EP97944826 A EP 97944826A EP 97944826 A EP97944826 A EP 97944826A EP 0925427 B1 EP0925427 B1 EP 0925427B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- decompression device
- automatic decompression
- clamp
- automatic
- 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.)
- Expired - Lifetime
Links
- 230000006837 decompression Effects 0.000 title claims description 41
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000013022 venting Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims 1
- 230000036316 preload Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
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
- F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
- F01L13/085—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio the valve-gear having an auxiliary cam protruding from the main cam profile
Definitions
- the present invention relates to automatic decompression for an internal combustion engine, in particular a single cylinder diesel engine, with at least one outlet and one inlet valve, the of a camshaft with at least one cam can be controlled, whereby to reduce the starting resistance the exhaust valve is vented when starting is and with other features according to the preamble of claim 1.
- the object of the present invention is therefore a easy to manufacture, inexpensive automatic decompression to create by a purely mechanical Regulation works fully automatically and only requires little space.
- This task is done by an automatic decompression solved with the features of claim 1. It is for venting the exhaust valve below a switching speed for switching from decompression to Compression a fully automatic lifting device provided which the lifting of the exhaust valve from Valve seat causes.
- the lifting device causes this way venting the valve as long as the Camshaft below a defined switching speed turns. This advantageously leads to Reduce the starting resistance during the Tempering, causing the engine to either by hand using a reversing rope or a crank or electrically by means of a small starter motor is started.
- The is above the switching speed Lifting device inactive, i.e. the valve will not ventilated and therefore full compression given.
- the invention provides that the Lifting device an articulated, arranged between cams and a control disc Bracket with two articulated arms and one connecting them Traverse has that at speeds below the switching speed an indented decompression position occupies in the cam plane at which he protrudes beyond the cam base circle, and after Reaching the switching speed in a neutral Position in the control disc level can be disengaged.
- the bracket is designed such that it around one in a parallel to the cam plane Axis of rotation is pivotable and in such a way that the Bracket with slowly rotating or at a standstill located camshaft with the across Articulated arms arranged traverse in the cam plane is indented and over the cam base circle protrudes.
- the mass of the flyweight is dimensioned so that it is at the defined switching speed extreme radial position against the pressure of the spring occupies, i.e. that in this position on one Stop is present.
- the preload spring also ensures for making the flyweight independent in its rest position of the gravitational forces in one defined position is held.
- the preload force of the spring consider.
- the flyweight with the bracket via one arranged on the articulated arm Driver is coupled.
- the driver designed as a lever with coupled to an arm of the flyweight.
- the carrier arm keeps the bracket in siner indented position, in which the traverse is in the cam level.
- the switching speed between 300 and 600 rpm, preferably at 400 rpm lies.
- control cam has a groove for receiving the Has bracket in the engaged position.
- bracket maintains its defined position and will protected from deformation.
- the inlet valve over the same cam as the exhaust valve can be actuated and in the direction of rotation of the camshaft during the phase decompression after the exhaust valve in addition this is aired.
- the advantage is that in connection with reversing or kick start devices the starting resistance by the proportion of charge change work to be performed for the suction stroke is reduced. This also ensures that no unfiltered suction from the exhaust tract can be done.
- valve rocker arm is provided between the cam and the valve. This can be the valve directly or via a push rod head for.
- valve rocker arm due to the lifting device by 0.2 mm - 0.6 mm, preferably 0.4 mm can be raised. This If implemented accordingly, the Valves between 0.3 and 0.8 mm.
- Fig. 1 shows a front view of a first embodiment the automatic decompression according to the invention with arranged on the camshaft 20 Cam 1 and a control disc 2.
- a first flyweight 3 which stored in a point 4 and by a spring 5 in radial direction is pressed inwards second flyweight 6 with another bearing point 7 and the common joint 8 and the driving arm 9 and the bracket 22 stored.
- the driver 10, the connected articulated arm 11, the second articulated arm 13 and the cross member 14 form the bracket 22.
- Die Tooth 15 of the control disc 2 and the cam base circle 19 are by a dash-dotted line indicated.
- dash-dotted lines Lines of the rocker arms 16 for the exhaust valve and the rocker arm 17 shown for the inlet valve.
- the nose 18 of the first flyweight 3 and the nose 19 of the second flyweight 6 are shown, each at the bearing points 4 and 7 opposite ends of the arcuate flyweights are arranged.
- Fig. 2 shows a sectional side view of the Automatic decompression system according to FIG. 1 the rocker arm 16 of the exhaust valve shown. This has a sliding surface 21, which rests on the cam 1 and depending on it Lifting movement opens or closes the exhaust valve.
- the bracket 22 with the cross member 14 and the articulated arm 11 and the driver 10 is in on both articulated arms a bearing 23 pivotable in the control disk 2 stored. Furthermore, the camshaft 20, the first centrifugal weight 3 and the second centrifugal weight 6 and the toothing 15 of the control disk 2 is shown.
- the cross member 14 engages a groove 26 of the cam 1, whereby the crossbar 14 of the bracket 22 over the cam base circle N. protrudes a few tenths of a millimeter.
- the indented bracket first lifts the Rocker arm 17 of the intake valve by a few tenths of a millimeter where the effective crank angle range by the arc length of the bracket 22, i.e. through the Length of the cross member 14 is determined.
- That state is shown in Fig. 3. Opens when turning further the cam 1 first the exhaust valve, then that Inlet valve and lifts the outlet valve after the Closing again slightly thanks to the indented bracket on.
- the bracket is engaged and disengaged thereby, as already described, controlled by centrifugal force, only then indenting when re-engaging can take place when the bracket is not straight located at the level of a rocker arm.
- 6a to 6c show side views of different Embodiments of an inventive Bracket.
- 6b shows one Bracket, in which the bearing by a ball 60th is formed.
- 6c finally shows the side view an embodiment of an inventive Bracket, in which the bearing is formed by an axis 61 becomes.
- FIG. 7 shows a further embodiment of a Automatic decompression according to the invention.
- the first flyweight 70 an inner radius designed as a ramp 71 has and secondly in that the Bracket 72 around one through the center line of the camshaft leading axis 73 is pivotable.
- the bracket 72 points next to the articulated arm 74 and the cross member 75 a lever arm 76 which by a spring 77 is charged. This will make the bracket above the Shifting speed disengaged and in this position held.
- the bracket is below the switching speed against the spring pressure of the spring 77 through the ramp 71 to its indented position in the cam plane pushed and held in this position until the The centrifugal weight moves outwards again.
- valve timing diagram of decompression with 100 the valve lift curve of the exhaust valve, with 102 the valve lift curve of the intake valve, with 103 the valve lift through the automatic decompression on the inlet valve and at 104 the valve lift through the automatic decompression is shown on the outlet valve.
- ignition TDC is designated and with 106 the overlap TDC. This becomes clearly recognizable Diagram that about 40 ° before TDC and 40 ° after Ignition TDC there is no lifting of the valve.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Description
- Fig. 1
- eine Vorderansicht einer ersten Ausführungsform der erfindungsgemäßen Dekompressionsautomatik;
- Fig. 2
- eine geschnittene Seitenansicht der Dekompressionsautomatik nach Fig. 1;
- Fig. 3
- eine Vorderansicht der Dekompressionsautomatik nach Fig. 1, wobei das Einlaßventil gelüftet ist;
- Fig. 4
- eine Dekompressionsautomatik nach Fig. 1 nach Erreichen der Schaltdrehzahl;
- Fig. 5
- eine geschnittene Seitenansicht der Dekompressionsautomatik nach Fig. 1 nach Erreichen der Schaltdrehzahl;
- Fig. 6a - 6c
- verschiedene Ausführungsformen eines erfindungsgemäßen Bügels;
- Fig. 7
- eine weitere Ausführungsform der erfindungsgemäßen Dekompressionsautomatik in geschnittener Seitenansicht;
- Fig. 8
- ein Ventilsteuerschaubild mit Dekompression.
Claims (11)
- Dekompressionsautomatik für eine Brennkraftmaschine, insbesondere einen Einzylinder-Dieselmotor, mit mindestens einem Auslaß- und einem Einlaßventil, die von einer Nockenwelle (20) mit mindestens einem Nocken (1) angesteuert werden, wobei zur Reduzierung des Andrehwiderstands beim Anlassen das Auslaßventil gelüftet wird, wobei zum Lüften des Auslaßventils unterhalb einer Schaltdrehzahl für das Umschalten von Dekompression auf Kompression eine vollautomatische in den Nocken (1) des Auslaßventils eingreifende Aushebevorrichtung vorgesehen ist, welche das Abheben des Auslaßventils vom Ventilsitz bewirkt, wobei die Aushebevorrichtung einen gelenkig gelagerten zwischen Nocken (1) und einer Steuerscheibe (2) angeordneten Bügel (22, 72) mit zwei Gelenkarmen (11, 13; 74) und eine diese verbindende Traverse (14; 75) aufweist, der bei Drehzahlen unterhalb der Schaltdrehzahl eine eingerückte Dekompressionsstellung in der Nockenebene einnimmt, bei der er über den Nockengrundkreis (N) hervorsteht,
dadurch gekennzeichnet,
daß der Bügel (22, 72) nach Erreichen der Schaltdrehzahl in eine neutrale Stellung in der Steuerscheibenebene ausrückbar ist, und daß zur drehzahlabhängigen Steuerung des Ein- und Ausrückvorgangs mindestens ein durch eine Feder (5) in radialer Richtung nach innen druckbeaufschlagtes Fliehgewicht (3; 70) mit dem Bügel flexibel gekoppelt ist. - Dekompressionsautomatik nach Anspruch 1,
dadurch gekennzeichnet,
daß der Innenradius des Fliehgewichts (70) als Rampe (71) zum Einrücken des Bügels (72) gegen den Widerstand einer Ausrückfeder (77) ausgebildet ist. - Dekompressionsautomatik nach Anspruch 1,
dadurch gekennzeichnet,
daß das Fliehgewicht (3) mit dem Bügel (22) über einen an einem Gelenkarm (11) angeordneten Mitnehmer (10) gekoppelt ist. - Dekompressionsautomatik nach Anspruch 1,
dadurch gekennzeichnet,
daß zwei bogenförmige Fliehgewichte (3, 6; 70; 78) vorgesehen sind, die durch ein Gelenk (8) miteinander gekoppelt sind. - Dekompressionsautomatik nach Anspruch 1,
dadurch gekennzeichnet,
daß durch entsprechende Bogenlänge des Bügels (22; 72) das Lüften in der Dekompressionsstellung jeweils in einem definierten Kurbelwinkelbereich von etwa 90° erfolgt. - Dekompressionsautomatik nach Anspruch 1,
dadurch gekennzeichnet,
daß die Schaltdrehzahl zwischen 300 und 600 Upm, vorzugsweise bei 400 Upm liegt. - Dekompressionsautomatik nach Anspruch 1,
dadurch gekennzeichnet,
daß im Steuernocken eine Nut (25) zur Aufnahme des Bügels (22) in eingerückter Position vorgesehen ist. - Dekompressionsautomatik nach Anspruch 1,
dadurch gekennzeichnet,
daß das Einlaßventil über denselben Nocken (1) wie das Auslaßventil betätigbar ist und in Drehrichtung der Nockenwelle (20) nach dem Auslaßventil in der Dekompressionsphase zusätzlich zu diesem gelüftet wird. - Dekompressionsautomatik nach Anspruch 8,
dadurch gekennzeichnet,
daß das Schließen des Auslaßventils 40° vor Zünd-OT und das Öffnen des Einlaßventils 40° nach Zünd-OT vorgesehen ist. - Dekompressionsautomatik nach Anspruch 1,
dadurch gekennzeichnet,
daß ein Ventilschlepphebel (16; 17) zwischen Nocken (1) und Ventil vorgesehen ist. - Dekompressionsautomatik nach Anspruch 10,
dadurch gekennzeichnet,
daß der Ventilschlepphebel (16; 17) durch die Aushebevorrichtung um 0,2 mm bis 0,6 mm, vorzugsweise um 0,4 mm anhebbar ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19636811 | 1996-09-11 | ||
DE19636811A DE19636811C2 (de) | 1996-09-11 | 1996-09-11 | Dekompressionsautomatik |
PCT/EP1997/004799 WO1998011330A1 (de) | 1996-09-11 | 1997-09-04 | Dekompressionsautomatik |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0925427A1 EP0925427A1 (de) | 1999-06-30 |
EP0925427B1 true EP0925427B1 (de) | 2000-12-13 |
Family
ID=7805193
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97944826A Expired - Lifetime EP0925427B1 (de) | 1996-09-11 | 1997-09-04 | Dekompressionsautomatik |
Country Status (5)
Country | Link |
---|---|
US (1) | US6223708B1 (de) |
EP (1) | EP0925427B1 (de) |
JP (1) | JP2001500209A (de) |
DE (2) | DE19636811C2 (de) |
WO (1) | WO1998011330A1 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6886518B2 (en) * | 2000-02-18 | 2005-05-03 | Briggs & Stratton Corporation | Retainer for release member |
US6782861B2 (en) * | 2001-02-09 | 2004-08-31 | Briggs & Stratton Corporation | Vacuum release mechanism |
US6539906B2 (en) * | 2001-03-30 | 2003-04-01 | Tecumseh Products Company | Mechanical compression and vacuum release |
DE10253231B3 (de) * | 2002-11-15 | 2004-02-12 | Dr.Ing.H.C. F. Porsche Ag | Automatische Dekompressionsvorrichtung für ventilgesteuerte Brennkraftmaschinen |
FR2884561B1 (fr) | 2005-04-14 | 2010-04-23 | Renault Sas | Bougie pour vehicule automobile hybride et procede de decompression associe d'un moteur de vehicule hybride. |
US7328678B2 (en) * | 2005-06-07 | 2008-02-12 | Tecumseh Power Company | Mechanical compression and vacuum release mechanism |
US7174871B2 (en) * | 2005-06-07 | 2007-02-13 | Tecumseh Products Company | Mechanical compression and vacuum release mechanism |
JP6226787B2 (ja) * | 2014-03-19 | 2017-11-08 | 本田技研工業株式会社 | デコンプ機構付き内燃機関 |
DE102015204550A1 (de) | 2015-03-13 | 2016-09-15 | Bayerische Motoren Werke Aktiengesellschaft | Nockenwelle mit einer Dekompressionsvorrichtung |
DE102015225727A1 (de) | 2015-12-17 | 2017-07-06 | Bayerische Motoren Werke Aktiengesellschaft | Dekompressionsvorrichtung für eine Hubkolben-Brennkraftmaschine |
RO132154A2 (ro) | 2016-03-21 | 2017-09-29 | Schaeffler Technologies AG & Co.KG | Aranjament de comutare cu came |
DE102019204091A1 (de) * | 2019-03-26 | 2020-10-01 | Volkswagen Aktiengesellschaft | Verfahren zum Starten eines Verbrennungsmotor und Antriebsanordnung für ein Kraftfahrzeug |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2522725B1 (fr) | 1982-03-04 | 1985-11-22 | Bernard Moteurs | Decompresseur a commande centrifuge pour faciliter le demarrage des moteurs a combustion interne |
JPS6032507U (ja) * | 1983-08-10 | 1985-03-05 | 川崎重工業株式会社 | エンジンのオ−トデコンプ装置 |
US4590905A (en) * | 1984-05-04 | 1986-05-27 | Honda Giken Kogyo Kabushiki Kaisha | Process for decompression control in internal combustion engine and apparatus therefor |
JPH066888B2 (ja) * | 1984-07-10 | 1994-01-26 | 富士重工業株式会社 | エンジンのデコンプ装置 |
JPH086574B2 (ja) | 1987-06-05 | 1996-01-24 | 本田技研工業株式会社 | 内燃機関のデコンプ装置 |
US5150674A (en) * | 1991-05-21 | 1992-09-29 | Briggs & Stratton Corporation | Centrifugally responsive compressing release mechanism |
US5155453A (en) | 1991-05-23 | 1992-10-13 | Samsung Semiconductor, Inc. | Low-power crystal oscillator |
US5301643A (en) * | 1993-05-05 | 1994-04-12 | Briggs & Stratton Corporation | Low oil sensor using compression release to affect engine operation |
JP3464715B2 (ja) * | 1994-09-07 | 2003-11-10 | 本田技研工業株式会社 | Ohcエンジン |
JP3366171B2 (ja) * | 1995-12-28 | 2003-01-14 | 本田技研工業株式会社 | エンジンのデコンプ機構 |
-
1996
- 1996-09-11 DE DE19636811A patent/DE19636811C2/de not_active Expired - Fee Related
-
1997
- 1997-09-04 DE DE59702768T patent/DE59702768D1/de not_active Expired - Fee Related
- 1997-09-04 WO PCT/EP1997/004799 patent/WO1998011330A1/de active IP Right Grant
- 1997-09-04 JP JP10513218A patent/JP2001500209A/ja not_active Ceased
- 1997-09-04 EP EP97944826A patent/EP0925427B1/de not_active Expired - Lifetime
- 1997-09-04 US US09/254,579 patent/US6223708B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
WO1998011330A1 (de) | 1998-03-19 |
DE19636811A1 (de) | 1998-03-12 |
EP0925427A1 (de) | 1999-06-30 |
JP2001500209A (ja) | 2001-01-09 |
US6223708B1 (en) | 2001-05-01 |
DE19636811C2 (de) | 2000-06-15 |
DE59702768D1 (de) | 2001-01-18 |
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