EP0555805A1 - Automatische Vorrichtung zur Verminderung der Verdichtung während des Anlassens einer Brennkraftmaschine - Google Patents

Automatische Vorrichtung zur Verminderung der Verdichtung während des Anlassens einer Brennkraftmaschine Download PDF

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Publication number
EP0555805A1
EP0555805A1 EP93101965A EP93101965A EP0555805A1 EP 0555805 A1 EP0555805 A1 EP 0555805A1 EP 93101965 A EP93101965 A EP 93101965A EP 93101965 A EP93101965 A EP 93101965A EP 0555805 A1 EP0555805 A1 EP 0555805A1
Authority
EP
European Patent Office
Prior art keywords
camshaft
engine
movable
seat
usual
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Withdrawn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
EP93101965A
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English (en)
French (fr)
Inventor
Eugenio Carmine
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.)
CAGIVA SERVICES SpA
Original Assignee
CAGIVA SERVICES SpA
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 CAGIVA SERVICES SpA filed Critical CAGIVA SERVICES SpA
Priority to TW082105536A priority Critical patent/TW222317B/zh
Publication of EP0555805A1 publication Critical patent/EP0555805A1/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Withdrawn legal-status Critical Current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
    • 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

  • This invention relates to an automatic device for motorcycle engine decompression during starting, said engine comprising a usual camshaft cooperating with a usual timing chain or toothed belt and operating on at least one exhaust valve of at least one corresponding cylinder within which a piston moves reciprocatingly.
  • One of such devices for application to motorcycles with conventional starting, comprises a lever or similar member fixed to a suitable part of the vehicle (generally the handlebar).
  • a lever or similar member fixed to a suitable part of the vehicle (generally the handlebar).
  • said lever When said lever is operated it opens the exhaust valve of the cylinder or cylinders during starting, the valve subsequently being operated in known manner by the usual camshaft.
  • Another of such devices comprises a cable associated directly with the usual starting pedal crank; when the pedal crank is put in the starting position the exhaust valve is opened by the cable, to achieve decompression of the engine cylinder with which the valve is associated.
  • An object of the invention is to provide a device of the aforesaid type which is of simple construction, safe and reliable operation, and overcomes the drawbacks of analogous known devices.
  • a further object of the invention is to provide a device which can be applied both to motorcycles with electrical starting (ie using a normal starting motor) and to motorcycles with conventional starting (by a pedal crank), and which in this latter case does not cause any undesirable movement of the pedal crank so as not to generate any recoil against the user's foot when operating on the pedal crank to start the motorcycle.
  • a further object is to provide a device which can be used both on single-cylinder engines and on multi-cylinder engines.
  • a further object is to provide a device able, in the case of electrical starting, to safeguard the mechanical stability of the usual starting motor gears on stopping the motorcycle.
  • a device of the aforesaid type characterised by comprising movable shifter means associated with the camshaft and cooperating with said exhaust valve, and arranged to assume at least two working positions, in a first working position assumed during the starting of the engine they opening said valve and in a second position they having no influence on the usual action of the camshaft on the valve, control means being provided operationally connected to said shifter means and associated with a rotating member of the engine, said control means being able to assume on the basis of the rotational speed of the engine two working positions such as to move said shifter means into the aforesaid positions and allow during the starting of the motorcycle the decompression of that cylinder on which said exhaust valve is located.
  • a camshaft is indicated overall by 1 and is supported rotatably on bearings 2 by a fixed structure or head of the engine 3 at both its ends (only one, the end 4 is shown in Figure 2).
  • the camshaft 1 has a disc-shaped support 5 to which a sprocket wheel 7 is fixed (for example by bolts 6) to cooperate in known manner with a timing chain or toothed belt, not shown.
  • the camshaft 1 comprises in a lateral surface 1B a seat 10 housing a cylindrical member 11 rotating in a hole 20 (about its axis Z) provided in the support 5.
  • the member 11 comprises on the end 17A of the portion 17 a cam contour, as shown in Figure 2A, creating a step 19.
  • This member passes through the hole 20 in said disc-shaped support 5, its end part 22 emerging from this hole at the end 4 of the camshaft 1.
  • To said end part there is connected one end 23 of a centrifugal member or weight 24 comprising an enlarged portion 25 distant from the end 23.
  • the portion 25 is positioned in and movable within a seat 27 in the sprocket wheel 7.
  • the end part 22 of the member 11 is subjected to a tension or torsion spring 29 with its opposing ends (not visible in the figures) connected to the centrifugal weight 24 and to the camshaft 1 respectively.
  • the surface 18 of the member 11 is arranged to cooperate with a usual rod 30 associated with a known rocker (or to cooperate directly with a rocker) of an exhaust valve positioned on a cylinder of the motorcycle engine (not shown).
  • the eccentric weight 24 is in the position shown by dashed lines in Figure 1. In this position the said weight retains the member 11 in a position rotated from the position shown in Figure 2. As the end 17A has a cam contour, the member 11 rotates is eccentric with respect to this latter, the member 11 projects with its surface 18 beyond the shoulder 15 or rather beyond its outer surface 15A. This results in the raising of the rod or rocker 30, and hence the opening of the corresponding exhaust valve in known manner.
  • the cylinder on which said valve is located is in the decompressed stage.
  • the camshaft 1 rotates (even at idling) at a rotational speed such that the weight 24 (subjected to centrifugal force as it rotates with the member 11) moves into the position shown by full lines in Figure 1. This takes place against the action of the spring 29, which tends to maintain the weight in the position shown dashed in Figure 1.
  • FIGS. 3 to 5 show a first modification of the invention.
  • parts corresponding to those of the already described figures are indicated by the same reference numerals.
  • the camshaft comprises a cavity 40 opening at 40A at one end 41 of the camshaft 1, where a usual split ring 42 is provided.
  • a member 46 with one end 47 facing said opening 40A is movably housed in the cavity 40.
  • the end 47 cooperates with a compression spring 48 having one end 49 cooperating with the member 46 and the other end 50 cooperating with the split ring 42.
  • the member 46 comprises a first portion 51, with one end 52 of which there is associated a second portion 53 of stepped pattern and comprising at least one first part 55 of diameter less than a second part 56 and less than a third part 59. In this manner, the member 46 has a substantially central narrowed portion.
  • the end 52 of the first portion 51 has a frusto-conical cavity 58 (or comprising at least one inclined surface) with which there cooperates a complementarily-shaped end part 60 of a movable element 61 comprising a portion 62 slidable within a hole 63 provided in the camshaft 1.
  • This element is arranged with its axis W perpendicular to the axis K of the camshaft cavity 40 and moves perpendicularly to the member 46. That end 65 of the movable element 61 distant from the part 60 is arranged to cooperate with the rod or rocker 30.
  • the other end 66 of the portion 51 of the member 46 is substantially conical (or comprising an inclined surface) to cooperate with a recess 67 of corresponding shape provided in a rod 68 slidable within a hole 69 perpendicular to the cavity 40 and rigid with a centrifugal weight 70 located outside the hole 68.
  • the weight 70 moves within a seat 71 provided in the sprocket wheel 7.
  • the rod 68 and the weight 70 are in the position shown in Figure 3. Specifically, the rod 68 is completely contained within the hole 69 and the centrifugal weight is close to the end 4 of the camshaft 1. The end 66 of the member 46 is inserted in the rod recess 67, said member being maintained in this position by the spring 48.
  • the movable element 61 projects from the hole 63, with its end 65 cooperating with the rod or rocker 30 to maintain the exhaust valve open.
  • the part 60 of the element 61 comes into contact with the end 52 of the member 46 and penetrates into the frusto-conical cavity 58.
  • the end part 60 penetrates increasingly into cavity 58. This causes the element 61 to move within the hole 63 towards the cavity 40 with consequent movement of the end 65, which becomes coplanar with the surface of the cam 1A.
  • the member 46 comprises a through longitudinal hole 46A through which usual lubricant can pass from the cavity 40 to the end 66 of said member and lubricate the wall of the recess 67 to facilitate its cooperation with said end and hence the movement of the member within the camshaft 1.
  • FIGS. 6 to 8 show a further embodiment of the invention.
  • parts corresponding to those of the already described figures are indicated with the same reference numerals.
  • the member 46 does not slide longitudinally within the cavity 40 but rotates therein about its axis K against the spring 48, for example a flat spring.
  • a pin 80 extends from an eccentric position in the end 66 (flat in this embodiment) of the member 46 to penetrate into a radial recess 81 provided in the rod 68 starting from a central region of this latter.
  • the rod 68 is associated with the centrifugal weight 70, which comprises a seat 82 at least partly housing a compression spring 83, one end 84 of which cooperates with the weight 70 whereas its other end 85 cooperates with the sprocket wheel 7.
  • the end 47 of the member 46 is of eccentric or cam-shaped cross-section (see Figure 8). With this end there cooperates the flat terminal portion 90 of the element 61 distant from that end 65 cooperating with the rod or rocker 30.
  • the rod 68 is contained in its hole 69 and the member 46 is in the position shown in Figure 6 in which it maintains the rod or rocker 30 in a position which keeps the exhaust valve open.
  • the described device of the invention can be used for controlling a plurality of exhaust valves associated with several cylinders.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
EP93101965A 1992-02-10 1993-02-09 Automatische Vorrichtung zur Verminderung der Verdichtung während des Anlassens einer Brennkraftmaschine Withdrawn EP0555805A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW082105536A TW222317B (de) 1992-02-10 1993-07-12

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI920261A IT1254606B (it) 1992-02-10 1992-02-10 Dispositivo automatico di decompressione di un motore di una motocicletta in fase di avviamento
ITMI920261 1992-02-10

Publications (1)

Publication Number Publication Date
EP0555805A1 true EP0555805A1 (de) 1993-08-18

Family

ID=11361873

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93101965A Withdrawn EP0555805A1 (de) 1992-02-10 1993-02-09 Automatische Vorrichtung zur Verminderung der Verdichtung während des Anlassens einer Brennkraftmaschine

Country Status (3)

Country Link
EP (1) EP0555805A1 (de)
IT (1) IT1254606B (de)
TW (1) TW222317B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19632074A1 (de) * 1996-08-08 1998-02-12 Siemens Ag Verfahren zum Betrieb eines mit einem Starter-Generator koppelbaren ventilgesteuerten Verbrennungsmotors
US6109230A (en) * 1997-09-16 2000-08-29 Fuji Robin Kabushiki Kaisha Decompression device for an engine
EP1070833A3 (de) * 1999-07-21 2001-06-13 Tecumseh Products Company Dekompressionsvorrichtung
WO2002018751A1 (en) * 2000-09-01 2002-03-07 Bombardier-Rotax Gmbh Blow-by gas separator and decompressor for an internal combustion engine
US6758197B2 (en) 2000-09-01 2004-07-06 Bombardier-Rotax Gmbh Blow-by gas separator and decompressor for an internal combustion engine
EP1460240A3 (de) * 2003-03-17 2008-02-13 HONDA MOTOR CO., Ltd. Nockenvorrichtung mit einer Dekompressionsvorrichtung
DE102016119105A1 (de) * 2016-10-07 2018-04-12 Uwe Eisenbeis Nockenwelle für Verbrennungsmotor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI451031B (zh) * 2010-05-12 2014-09-01 Sanyang Industry Co Ltd Engine decompression mechanism

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1592083A (en) * 1925-03-12 1926-07-13 V Baldwin Van Valve control
DE897175C (de) * 1951-09-13 1953-11-19 Kloeckner Humboldt Deutz Ag Vorrichtung zur voruebergehenden Verminderung oder Aufhebung der Verdichtung waehrend des Anlassens von ventilgesteuerten Brennkraftmaschinen
GB1132391A (en) * 1965-01-12 1968-10-30 Tecumseh Products Co Improvements in and relating to compression relief mechanisms
EP0362775A1 (de) * 1988-10-03 1990-04-11 Fuji Jukogyo Kabushiki Kaisha Verdichtungsverminderungsvorrichtung für Brennkraftmaschinen
US4955330A (en) * 1988-12-28 1990-09-11 Christian Fabi Cam drive mechanism for internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1592083A (en) * 1925-03-12 1926-07-13 V Baldwin Van Valve control
DE897175C (de) * 1951-09-13 1953-11-19 Kloeckner Humboldt Deutz Ag Vorrichtung zur voruebergehenden Verminderung oder Aufhebung der Verdichtung waehrend des Anlassens von ventilgesteuerten Brennkraftmaschinen
GB1132391A (en) * 1965-01-12 1968-10-30 Tecumseh Products Co Improvements in and relating to compression relief mechanisms
EP0362775A1 (de) * 1988-10-03 1990-04-11 Fuji Jukogyo Kabushiki Kaisha Verdichtungsverminderungsvorrichtung für Brennkraftmaschinen
US4955330A (en) * 1988-12-28 1990-09-11 Christian Fabi Cam drive mechanism for internal combustion engine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19632074A1 (de) * 1996-08-08 1998-02-12 Siemens Ag Verfahren zum Betrieb eines mit einem Starter-Generator koppelbaren ventilgesteuerten Verbrennungsmotors
WO1998006940A1 (de) * 1996-08-08 1998-02-19 Siemens Aktiengesellschaft Verfahren zum betrieb eines mit einem starter-generator kupplungslos gekoppelten ventilgesteuerten verbrennungsmotors und verbrennungsmotor zur durchführung des verfahrens
DE19632074C2 (de) * 1996-08-08 1998-11-05 Siemens Ag Verfahren zum Betrieb eines mit einem Starter-Generator kupplungslos gekoppelten ventilgesteuerten Verbrennungsmotors und ventilgesteuerter Verbrennungsmotor zur Durchführung des Verfahrens
US6109230A (en) * 1997-09-16 2000-08-29 Fuji Robin Kabushiki Kaisha Decompression device for an engine
EP1070833A3 (de) * 1999-07-21 2001-06-13 Tecumseh Products Company Dekompressionsvorrichtung
WO2002018751A1 (en) * 2000-09-01 2002-03-07 Bombardier-Rotax Gmbh Blow-by gas separator and decompressor for an internal combustion engine
US6758197B2 (en) 2000-09-01 2004-07-06 Bombardier-Rotax Gmbh Blow-by gas separator and decompressor for an internal combustion engine
EP1460240A3 (de) * 2003-03-17 2008-02-13 HONDA MOTOR CO., Ltd. Nockenvorrichtung mit einer Dekompressionsvorrichtung
DE102016119105A1 (de) * 2016-10-07 2018-04-12 Uwe Eisenbeis Nockenwelle für Verbrennungsmotor

Also Published As

Publication number Publication date
ITMI920261A0 (it) 1992-02-10
TW222317B (de) 1994-04-11
IT1254606B (it) 1995-09-28
ITMI920261A1 (it) 1993-08-10

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