Cylinder head structure in four-cycle engine

Details Cylinder head structure in four-cycle engine Cylinder head structure in four-cycle engine

F - Mech Eng,Light,Heat,Weapons

02

F

F02F 1/24 (2006.01) F01L 1/18 (2006.01) F01L 1/26 (2006.01) F02B 61/02 (2006.01) F02F 1/42 (2006.01)

Patent

CA 2650895

To achieve further reduction in size and weight of a cylinder head in a four-- cycle engine having a connection surface formed on the cylinder head to connect a head cover set so as to follow along a plane that is inclined so as to be spaced further away from a cylinder block toward a first side wall in which an intake port is disposed relative to a second side wall in which an exhaust port is disposed. A camshaft holder having a semi-circular bearing portion and integrally connected to a first side wall is integrally formed on a cylinder head in a protruding condition so as to protrude from a connection surface as viewed from an axial direction of a camshaft. An intake port is disposed in the first side wall such that an upstream end thereof is disposed at the same position as that at which part of the bearing portion is disposed in a direction along an axis of a cylinder bore. An exhaust valve has a stem end 43a disposed at a position protruding from the connection surface as viewed in a direction along the axial direction of a camshaft.

Conception permettant de réduire encore la dimension et le poids de la culasse d'un moteur à quatre temps dotée d'une surface d'assemblage sur la culasse pour assembler un couvercle de culasse en suivant un plan incliné afin de l'éloigner du bloc-cylindres dans le sens de la première paroi latérale, qui comporte un orifice d'admission placé en fonction d'une seconde paroi latérale, qui comporte un orifice d'échappement. Un support d'arbre à cames comprenant une partie portante semi-circulaire et entièrement reliée à la première paroi latérale est entièrement formé sur la culasse de façon à saillir de la surface d'assemblage, lorsqu'on la regarde sous l'angle axial de l'arbre à cames. Un orifice d'admission est percé dans la première paroi latérale de façon à ce que son extrémité en amont soit dans la même position. Cette portion de la partie portante est placée dans l'axe d'alésage du cylindre. Une soupape comporte une extrémité de tige (43a) en saillie qui origine de la surface d'assemblage, lorsqu'on la regarde sous l'angle axial de l'arbre à cames.

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