A gasket is to be disposed in a compressed state between a groove bottom surface defining a gasket groove formed in a first member and a seat surface of a second member so as to make a hermetical sealing between the groove bottom surface and the seal surface. The gasket includes a first seal section formed at an end part of the gasket in a compression direction. The first seal section is ridge-shaped so as to become slender in a direction toward a tip portion of the first seal section. The first seal section has first and second side surfaces which are opposite to each other with respect to a first plane passing through the tip portion of the first seal section. The first side surface overhangs outwardly larger than the second side surface.
1. A gasket to be disposed in a compressed state between a groove bottom surface defining a gasket groove formed in a first member and a seal surface of a second member so as to make a hermetical sealing between the groove bottom surface and the seal surface, the gasket comprising:
a first seal section formed at an end part of the gasket in a compression direction, the first seal section being ridge-shaped so as to become slender in a direction toward a tip portion of the first seal section, the first seal section having first and second side surfaces which are opposite to each other with respect to a first plane passing through the tip portion of the first seal section, the first side surface overhanging outwardly larger than the second side surface, wherein the tip portion of the first seal section is offset in a direction of the second side surface relative to a width direction center plane of the gasket groove; and
a second seal section formed at the other end part of the gasket in the compression direction, the second seal section being ridge-shaped so as to become slender in a direction toward a tip portion of the second seal section, the second seal section having third and fourth side surfaces which are opposite to each other with respect to a fifth plane passing through the tip portion of the second seal section, the third side surface overhanging outwardly larger than the fourth side surface,
wherein a third angle formed by the fifth plane and a tangential plane of the third side surface is larger than a fourth angle formed by the fifth plane and a tangential plane of the fourth side surface, the fifth plane being parallel with the width direction center plane of the gasket,
wherein the first side surface of the first seal section and the third side surface of the second seal section are connected to each other through an intermediate side surface which is contactable with a groove side surface defining the gasket groove, the intermediate side surface continuously extending throughout a longitudinal length of the gasket such that the intermediate side surface is configured to be in continuous contact with the groove side surface throughout the longitudinal length of the gasket upon compression.
2. A gasket as claimed in claim 1 , wherein the second side surface is steeper than the first side surface.
3. A gasket as claimed in claim 1 , wherein a first angle formed by the first plane and a tangential plane of the first side surface is larger than a second angle formed by the first plane and a tangential plane of the second side surface, the first plane being parallel with the width direction center plane of the gasket.
4. A gasket as claimed in claim 1 , wherein a first distance between the first side surface and a second plane passing through a surface of the tip portion of the first seal section is smaller than a second distance between the second side surface and the second plane, the first distance being on a third plane parallel with the width direction central plane of the gasket, the second distance being on a fourth plane parallel with the width direction center plane of the gasket, the third plane and the fourth plane being symmetrical to each other with respect to the width direction center plane of the gasket.