Engine

Details Engine Engine

F - Mech Eng,Light,Heat,Weapons

02

F

F02F 7/00 (2006.01) F01L 1/04 (2006.01) F01L 1/46 (2006.01) F02B 63/00 (2006.01) F02B 63/04 (2006.01) F02B 67/06 (2006.01) F02F 1/00 (2006.01)

Patent

CA 2606776

An engine where a crankshaft (12) and a camshaft (36) are connected by a timing transmission device (37) composed of a drive rotation member (45), a driven rotation member (46), and an endless transmission member (47), a working window (55) for attaching and detaching the driven rotation member (46) to and from the cam shaft (36) is opened in an outer end surface (5c) of a cylinder head (5), and a lid body (57) for closing the working window (55) is joined to the outer end surface. The outer end surface (5c), to which the lid body (57) is joined, of the cylinder head (5) is the inclined surface (5c) inclined such that that outer peripheral section of the driven rotation member (46) which is on the opposite side of the drive rotation member (45) is exposed from the working window (55). The construction improves workability in installation of the endless transmission member on the driven rotation member, installation of the driven rotation member on the camshaft, etc., and in addition, the construction contributes to downsizing of the engine.

La présente invention concerne un moteur constitué des éléments ci-après. Un vilebrequin (12) et un arbre à cames (36) sont reliés par un dispositif de transmission de synchronisation (37), composé d'un organe de commande de rotation (45), d'un organe de rotation commandé (46) et d'un organe de transmission sans fin (47). Une fenêtre de travail (55) permettant de connecter l'organe de rotation commandé (46) à l'arbre à cames (36) et de l'en déconnecter est ouverte dans une surface terminale externe (5c) d'une culasse (5). Un corps de couvercle (57) permettant de fermer la fenêtre de travail (55) est assemblé à la surface terminale externe. Dans la culasse (5), la surface terminale externe (5c), à laquelle est fixé le corps de couvercle (57), représente la surface inclinée (5c). Cette surface est inclinée de telle sorte que la partie périphérique externe de l'organe de rotation commandé (46) qui se trouve du côté opposé à l'organe de commande de rotation (45) soit exposée à travers la fenêtre de travail (55). Une construction de ce type offre une plus grande maniabilité lors de l'installation de l'organe de transmission sans fin sur l'organe de rotation commandé, lors de l'installation de l'organe de rotation commandé sur l'arbre à cames, etc. En outre, cette construction contribue à réduire la taille du moteur.

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