Patent ID: 9303587
Filing Date: 2016-04-05
CPC Classification: F02F,F16J

Claim Text:
1. A combination comprising: an internal combustion engine having a cylinder head and a cylinder block, and a gasket installed between the cylinder head and the cylinder block, the gasket comprising: a metal plate having a hole edge portion, and an annular sealing rubber having an outer circumferential side to which the hole edge portion of the metal plate is embedded, the annular sealing rubber having a cross-sectional shape symmetric to a center line in a thickness direction of the annular sealing rubber, wherein the annular sealing rubber comprises: a first bulging portion comprising a seal portion on an inner circumferential side of the sealing rubber, bulging in a direction perpendicular to the center line; a second bulging portion comprising an attachment portion relative to the metal plate on the outer circumferential side of the sealing rubber, bulging in the direction perpendicular to the center line; and a depressed portion between the first bulging portion and the second bulging portion, depressed in the direction perpendicular to the center line, wherein the first bulging portion includes a thickest portion carrying out a sealing function, and when the gasket is compressed by faces of the cylinder head and the cylinder block sandwiching the gasket from opposite sides, the second bulging portion and the depressed portion have a thickness which does not contact with the faces sandwiching the gasket, an end of the metal plate embedded in the sealing rubber is positioned in a range of the depressed portion between the first bulging portion and the second bulging portion, and between changing points where a sloping face sloping toward the depressed portion from each of the two bulging portions changes from a concave curved surface into a convex curved surface, the first bulging portion and the second bulging portion in the annular sealing rubber are formed as each including a flat portion on both sides of the center line in the thickness direction of the annular sealing rubber, the flat portion of the first bulging portion and the flat portion of the second bulging portion being portions of a single straight sloped line on each side of the center line, and the depressed portion is formed between the two bulging portions as having a shape depressing respectively both of the straight sloped lines into a circular are directed toward the center line portions, the end of the metal plate embedded in the annular sealing rubber is positioned within a range wherein the depressed portion forming the circular arc is formed, and at least thickness of the annular sealing rubber in the depressed portion is greater than 50% of a thickness of the thickest portion in the first bulging portion, and is less than a thickness of atop portion of the second bulging portion.