Internal combustion engine
AssigneeMazda Motor Corporation
InventorsYuma Miyauchi, Runa Suzuki
Life of this patent
Estimating the term…
Abstract
An internal combustion engine is provided, which includes an engine body provided with a cylinder having openings for intake and exhaust, and valve bodies that open and close the openings, cam shafts, each provided with a cam lobe that depress the corresponding valve body to open the openings, and bearing members pivotally supporting the cam shaft via lubricating oil. The cam shaft includes cam journals pivotally supported by the bearing members, and a recess formed at a position of the cam journal, opposing the cam lobe in the circumferential direction, and depressed radially inwardly of the cam journal, the recess being deeper in an axial end part of the cam journal than an axial center part.
Claims16
An internal combustion engine, comprising:
- an engine body defining at least one cylinder including at least one intake opening, at least one exhaust opening, and a plurality of valve bodies, each opening configured to be opened and closed via an associated valve body of the plurality of valve bodies;
- an intake cam shaft including at least one intake cam lobe corresponding to the at least one intake opening, each intake cam lobe configured to open the corresponding intake opening by depressing the associated valve body;
- and
- an exhaust cam shaft including at least one exhaust cam lobe corresponding to the at least one exhaust opening, each exhaust cam lobe configured to open the corresponding exhaust opening by depressing the associated valve body,
- wherein each cam shaft further includes a plurality of cam journals corresponding to a plurality of bearing members, each cam journal configured to be pivotally supported by the corresponding bearing member via lubricating oil,
- wherein each cam journal includes a recess formed on a surface of the cam journal between an axial center part of the cam journal and each axial end part of the cam journal which is adjacent to a corresponding cam lobe of the at least one intake cam lobe or the at least one exhaust cam lobe, and
- wherein each recess extends radially inwardly at a position that is diametrically opposed to a projecting side of the corresponding cam lobe such that the recess is deeper at the axial end part than at the axial center part.
Dependencies are inferred from the claim text.