Seal bead structure of gasket

摘要

Provided is a seal bead structure of a gasket capable of reducing the reactive force generated in a common bead portion provided between multiple through-holes and thereby capable of achieving a stable sealing function by means of aligning the compression property over the entire bead. In order to achieve this, two through-holes are provided in a row in the flat portion of a metal gasket, with one seal bead provided on the edge of one through-hole, the other seal bead provided on the edge of the other through-hole, and a common bead portion for the both seal beads provided in the intermediate position between the both through-holes, the common bead portion having a two-stage half bead shape in which the half beads are formed on two stage in the same direction.

主权项

1. A seal bead structure of a gasket comprising:
a first through hole; a second through hole; the first through hole and the second through hole being provided side by side with a spaced apart relationship from each other in a flat surface portion of a metal gasket; a first seal bead extending along a peripheral edge of said first through hole; a second seal bead extending along a peripheral edge of said second through hole; and a common bead portion of said first and second seal beads, the common bead portion being provided at an intermediate position between said first and second through holes, wherein said common bead portion has a two-stage half bead shape with two stages of half beads in the same direction, the two-stage half bead shape having a three-stage flat portion configuration including:
a planate connection portion having first and second ends in a width direction thereof;a first inclined portion integrally provided at a first predetermined angle of incline from the first end of the planate connection portion;a first leading end flat portion integrally provided at a first leading end of the first inclined portion opposite to the planate connection portion, the first leading end flat portion being substantially parallel to the planate connection portion and terminating at a free end forming a periphery of the first through hole;a second inclined portion integrally provided at a second predetermined angle of incline from the second end of the planate connection portion; anda second leading end flat portion integrally provided at a second leading end of the second inclined portion opposite to the planate connection portion, the second leading end flat portion being substantially parallel to the planate connection portion and terminating at a free end forming a periphery of the second through hole, wherein said planate connection portion is co-planar with said flat surface portion of said metal gasket, and wherein an entirety of the first inclined portion is separated from an entirety of the second inclined portion by the planate connection portion.