EP1255916B1 - Commande de decompression mecanique - Google Patents
Commande de decompression mecanique Download PDFInfo
- Publication number
- EP1255916B1 EP1255916B1 EP01907150A EP01907150A EP1255916B1 EP 1255916 B1 EP1255916 B1 EP 1255916B1 EP 01907150 A EP01907150 A EP 01907150A EP 01907150 A EP01907150 A EP 01907150A EP 1255916 B1 EP1255916 B1 EP 1255916B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- compression release
- release member
- cam
- engine
- cam follower
- 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
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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
-
- 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
Definitions
- said pivot axis is substantially parallel to said back surface.
- said first and second portions are substantially identical.
- Preferred embodiments of the present invention achieve many advantages over previous compression release mechanisms. Biasing springs are not needed when the invention is incorporated into vertical shaft engines. The costly process of machining the cam shaft is no longer necessary because the compression release member is preferably integrated into the cam, which can be slip fit over the cam shaft. This arrangement can be readily integrated into an engine utilizing a cam lever and direct lever overhead valve system.
- the pivot pin 28 preferably does not support the force exerted on the compression release member 24 by the cam follower 12.
- the bridging portion 48 contacts the back surface 32 which buttresses the compression release member 24. Most of the force the cam follower 12 applies on the compression release member 24 is absorbed by the back surface 32. Because of this arrangement, the pivot pin 28 will not suffer from large shear stresses and may last longer.
- the cam 4 preferably consists of the base radius 16 and the cam lobe 8.
- the cam followers 12, 14 control the exhaust and intake valves respectively and contact the cam 4 as it rotates.
- a valve is closed when a cam follower 12, 14 engages the base radius 16, and opened when a cam follower 12, 14 engages the cam lobe 8.
- the cam followers 12, 14 respectively for the exhaust and intake valves preferably contact the cam 4 at slightly different levels.
- the cam 4 preferably has a slot 20 that extends into the base radius 16.
- a compression release member 24 is preferably disposed within this slot 20 at a level that is only capable of contacting the exhaust valve cam follower 12 as the cam 4 rotates. In the alternative, compression release member 24 could operate on the intake valve.
Abstract
Claims (16)
- Moteur à combustion interne, comprenant:un arbre à cames (2);une came (4), comportantun bossage de came (8) s'engageant dans un galet suiveur (12) pour soulever une soupape du moteur;un rayon de base (16); et un élément de commande de décompression (24), le moteur étant caractérisé en ce que ledit élément de commande de décompression (24) est retenu par pivotement par un élément de retenue (28, 128) en un point adjacent audit rayon de base (16), ledit élément de commande de décompression (24) s'engageant dans ledit galet suiveur (12) en présence de vitesses de démarrage du moteur, et comportant un axe de pivotement (56) pratiquement transversal audit arbre à cames (2) mais ne coupant pas celui-ci.
- Moteur selon la revendication 1, caractérisé en ce que ledit élément de retenue est constitué par au moins un pivot (28) retenant ledit élément de commande de décompression.
- Moteur selon la revendication 1, caractérisé en ce que ledit élément de retenue englobe deux tenons (128) formés d'une seule pièce avec ladite came (4).
- Moteur selon la revendication 1, caractérisé par une fente (20) formée dans ledit rayon de base, ledit élément de commande de décompression étant agencé dans ladite fente.
- Moteur selon la revendication 4, caractérisé en ce que ladite fente est en partie définie par une surface arrière (32) supportant les forces de charge appliquées audit élément de commande de décompression par ledit galet suiveur.
- Moteur selon la revendication 1, caractérisé en ce que ledit axe de pivotement (56) est pratiquement parallèle à ladite surface arrière (32).
- Moteur selon la revendication 1, caractérisé en ce que ledit arbre à cames s'étend dans une direction verticale lors du fonctionnement normal du moteur, ledit élément de commande de décompression comportant une surface à came auxiliaire (36), s'engageant dans le galet suiveur, ledit élément de commande de décompression comportant un axe de pivotement et ladite surface à came auxiliaire étant agencée au niveau d'une position plus basse que ledit axe de pivotement dans la direction verticale.
- Moteur selon la revendication 1, caractérisé en ce que ledit élément de commande de décompression comporte une surface à came auxiliaire en forme d'arc (36) s'engageant dans le galet suiveur.
- Moteur selon la revendication 1, caractérisé en ce que ledit élément de commande de décompression pivote autour d'un axe de pivotement, ledit élément de commande de décompression étant symétrique audit axe de pivotement
- Moteur selon la revendication 1, caractérisé en ce que ledit élément de commande de décompression a pratiquement une forme en V.
- Moteur selon la revendication 1, caractérisé en ce que ledit élément de commande de décompression englobe:une première partie (40) comportant une surface à came auxiliaire s'engageant dans ledit galet suiveur;une deuxième partie (44) ayant une masse suffisante pour faire fonction de masselotte; etune partie de liaison (48) interconnectant lesdites première et deuxième parties.
- Moteur selon la revendication 11, caractérisé en ce que lesdites première et deuxième parties sont pratiquement identiques.
- Moteur selon la revendication 11, caractérisé en ce que ledit élément de commande de décompression pivote autour d'un axe de pivotement agencé entre lesdites première et deuxième parties.
- Moteur selon la revendication 1, caractérisé en ce que l'axe de pivotement est agencé entre ledit rayon de base et ledit arbre à cames.
- Moteur selon la revendication 1, caractérisé en ce que ladite came englobe une surface arrière supportant les forces de charge appliquées audit élément de commande de décompression par ledit galet suiveur, ledit élément de commande de décompression englobant une partie en U comportant une surface arrondie contactant ladite surface arrière pendant le pivotement de l'élément de commande de décompression par rapport à ladite came.
- Moteur selon la revendication 13, caractérisé en ce que ledit élément de commande de décompression pivote entre une position engagée, dans laquelle ladite surface à came auxiliaire s'engage dans ledit galet de came en présence de vitesses de démarrage du moteur, et une position dégagée, dans laquelle ladite surface à came auxiliaire ne s'engage pas dans ledit galet suiveur, lesdites première et deuxième parties étant agencées radialement vers l'extérieur dudit axe de pivotement par rapport audit arbre à cames lorsque ledit élément de commande de décompression se trouve dans la position dégagée.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/507,070 US6349688B1 (en) | 2000-02-18 | 2000-02-18 | Direct lever overhead valve system |
US507070 | 2000-02-18 | ||
PCT/US2001/004140 WO2001061157A1 (fr) | 2000-02-18 | 2001-02-09 | Commande de decompression mecanique |
US782468 | 2001-02-09 | ||
US09/782,468 US6494175B2 (en) | 2000-02-18 | 2001-02-09 | Mechanical compression release |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1255916A1 EP1255916A1 (fr) | 2002-11-13 |
EP1255916B1 true EP1255916B1 (fr) | 2005-09-14 |
Family
ID=27055692
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01907150A Expired - Lifetime EP1255916B1 (fr) | 2000-02-18 | 2001-02-09 | Commande de decompression mecanique |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1255916B1 (fr) |
AU (1) | AU2001257885A1 (fr) |
DE (1) | DE60113384T2 (fr) |
WO (1) | WO2001061157A1 (fr) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6439187B1 (en) | 1999-11-17 | 2002-08-27 | Tecumseh Products Company | Mechanical compression release |
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 |
US6536393B2 (en) | 2000-09-11 | 2003-03-25 | Tecumseh Products Company | Mechanical compression and vacuum release |
US6499453B1 (en) | 2000-10-30 | 2002-12-31 | Tecumseh Products Company | Mid cam engine |
JP4454872B2 (ja) * | 2001-02-20 | 2010-04-21 | 本田技研工業株式会社 | 内燃機関のデコンプ装置 |
US6539906B2 (en) | 2001-03-30 | 2003-04-01 | Tecumseh Products Company | Mechanical compression and vacuum release |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3395689A (en) * | 1966-09-15 | 1968-08-06 | Studebaker Corp | Engine decompression apparatus |
US5150674A (en) * | 1991-05-21 | 1992-09-29 | Briggs & Stratton Corporation | Centrifugally responsive compressing release mechanism |
US5301643A (en) * | 1993-05-05 | 1994-04-12 | Briggs & Stratton Corporation | Low oil sensor using compression release to affect engine operation |
DE19543445C1 (de) * | 1995-11-22 | 1997-02-20 | Porsche Ag | Automatische Dekompressionsvorrichtung für ventilgesteuerte Brennkraftmaschinen |
-
2001
- 2001-02-09 DE DE60113384T patent/DE60113384T2/de not_active Expired - Lifetime
- 2001-02-09 WO PCT/US2001/004140 patent/WO2001061157A1/fr active IP Right Grant
- 2001-02-09 EP EP01907150A patent/EP1255916B1/fr not_active Expired - Lifetime
- 2001-02-09 AU AU2001257885A patent/AU2001257885A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
WO2001061157A1 (fr) | 2001-08-23 |
DE60113384T2 (de) | 2006-06-22 |
EP1255916A1 (fr) | 2002-11-13 |
AU2001257885A1 (en) | 2001-08-27 |
DE60113384D1 (de) | 2005-10-20 |
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