US 2015/0090210 A1 · CAM BEARING LUBRICATION STRUCTURE FOR INTERNAL COMBUSTION ENGINE

Abstract

A cam bearing lubrication structure for an internal combustion engine includes a cylinder head having a cam bearing region, a plug hole for an ignition plug and a plug tube fitted liquid-tight therein. The cam bearing lubrication structure includes an outer periphery oil path bypassing along an outer peripheral face of the plug tube, a main lubricating oil passage extending through the plug hole and formed to connect to the outer periphery oil path and a guide passage formed in and through the cam bearing region to connect a sliding face of the cam bearing region from the outer periphery oil path and supplying lubricating oil to a sliding face of the cam bearing region and a camshaft. In addition, a lubricating oil supplying structure is provided for a valve apparatus for further increasing the oil supply amount to achieve a further increase in the speed of the engine.

Claims20

Dependent claims

A cam bearing lubrication structure for an internal combustion engine including:

a cylinder head having a cam bearing region for supporting a camshaft for rotation;
a plug hole in which an ignition plug supported on the cylinder head is accommodated such that an end thereof is exposed to a combustion chamber;
and
a plug tube having a cylindrical shape and fitted liquid-tight at upper and lower end portions thereof in the plug hole to separate the inside of the cylinder head and the plug hole from each other, the cam bearing lubrication structure for the internal combustion engine comprising:
an outer periphery oil path formed liquid-tight at the upper and lower end portions of the plug tube with respect to the plug hole and bypassing along an outer peripheral face of the plug tube;
a main lubricating oil passage extending through the plug hole in the cylinder head and formed for connecting to the outer periphery oil path;
and
a guide passage formed in and through the cam bearing region for connecting a sliding face of the cam bearing region from the outer periphery oil path and supplying lubricating oil to a sliding face of the cam bearing region and the camshaft.

5 more elements

A lubricating oil supplying structure for a valve apparatus of an internal combustion engine having a cylinder head which supports camshafts for rotation thereon, the lubricating oil supplying structure including:

for each pair of engine valves for intake and exhaust, rocker arms supported at pivotally supporting base portions thereof for rocking motion by rocker arm shafts, the rocker arms being interposed between valve stem axial ends of the engine valves and cam faces of the camshafts to allow contact therebetween, pressing force from the cam faces acting upon the rocking arms and being transmitted to the valve stems to open and close the engine valves, the lubricating oil supplying structure for the valve apparatus of the internal combustion engine comprising:
an oil passage provided in the cylinder head along an axial direction of the camshafts and formed from a single passage at a position lower than the rocker arm shafts between the engine valves;
and
a pair of oil injection oil paths formed so as to be directed independently for the individual rocker arms from the oil passage.

1 more element

Dependencies are inferred from the claim text.

Cam bearing lubrication structure for internal combustion engine

Life of this patent

Cam bearing lubrication structure for internal combustion engine

Life of this patent

Abstract

Claims20