SEALING METHOD FOR OIL FILLING PIPE OF LIQUID SEAL TYPE PRESSURE SENSOR, AND SEALING STRUCTURE FOR OIL FILLING PIPE OF LIQUID SEAL TYPE PRESSURE SENSOR USING THE SAME

摘要

PPROBLEM TO BE SOLVED: To preclude reliability of sealability in a seal portion from being reduced by flowing-out of oil and blowing-out of the oil by welding heat or the like, to preclude reliability as a pressure sensor from being reduced by a decrease in the filling amount of oil, to preclude the sealability in a welded part from being reduced by generation of a void, and to completely and surely seal a sealing part. PSOLUTION: A liquid seal chamber of an oil filling pipe, and a tip part in a liquid introducing opening side in an opposite side are crushed into a flat condition to from a crushed flat part 44, primary welding is carried out in the vicinity of a tip part 46 of the crushed flat part to form a primary welded part 48 for sealing the crushed flat part, secondary welding is conducted in the primary welded part, one portion in the liquid introducing opening side of a secondary welded part 58 is fused partially to form the secondary welded part, so as to seal liquid introducing opening of the oil filling pipe 36. PCOPYRIGHT: (C)2004,JPO