Patent ID: 6029523
Filing Date: 2000-02-29
Classification: G01L

Abstract:
A pressure sensor in which a pipe fitted with a plurality of O rings arranged in parallel to each other in an axial direction is inserted into a through hole formed in a bottom portion of O ring storage chambers from the O ring storage chambers formed in a cup which forms a pressure introduction portion with the pipe so that the plurality of O rings are inserted in such a manner that they are elastically deformed between the outer peripheral surface of the pipe and the inner peripheral surfaces of the respective O ring storage chambers, whereinthe line diameter of the O ring which is first inserted into the O ring storage chambers is made smaller than the line diameter of the O ring which is inserted later, the number of the O ring storage chambers corresponds to the plurality of O rings, the inner peripheral surfaces in contact with the O rings of the O ring storage chambers are interconnected by a stepped portion, and the stepped portion is located at a position where the O ring having a larger line diameter generates predetermined pressing force in the O ring storage chamber before the O ring having a smaller line diameter when the plurality of O rings fitted onto the pipe are inserted into the respective O ring storage chambers of the cup.