WELDING STRUCTURE AND DOUBLE ECCENTRIC VALVE HAVING THE SAME

• Main Authors: ITO SHIGETO, YOSHIOKA MAMORU, WAKAMATSU KEISUKE, KOBAYASHI MASAHIRO, INAGAKI TAKAKI, MURAISHI AKIO
• Format: Patent
• Language: English; Japanese
• Published: 14.06.2018
• Subjects: ACTUATING-FLOATS; BLASTING; CLADDING OR PLATING BY SOLDERING OR WELDING; COCKS; COMBUSTION ENGINES; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MACHINE TOOLS; MECHANICAL ENGINEERING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; TAPS; THERMAL INSULATION IN GENERAL; TRANSPORTING; VALVES; WEAPONS; WELDING; WORKING BY LASER BEAM

PROBLEM TO BE SOLVED: To prevent reduction in fatigue strength by stress-concentration in the vicinity of a welding part of welding two members.SOLUTION: A welding structure is provided with a welding part 1 formed by welding in a part of overlapping a projection part 39b and an installation part 40a, for integrating the projection part 39b of a valve element and the installation part 40a of a rotary shaft respectively composed of metal. The welding part 1 is provided with a first welding part M1 welded to the projection part 39b, a second welding part M2 welded to the installation part 40a and an unwelded part U1 sandwiched between the first welding part M1 and the second welding part M2, separating the projection part 39b and the installation part 40a and unwelded to the projection part 39b and the installation part 40a. An unwelded clearance 7 enclosed by the unwelded part U1, an inner peripheral surface of a hole 39c of the projection part 39b and an outer peripheral surface of the installation part 40a, is also provided adjacently to the welding part 1.SELECTED DRAWING: Figure 9 【課題】二つの部材を溶接した溶接部の近傍にて応力集中による疲労強度の低下を防止すること。【解決手段】溶接構造は、それぞれ金属よりなる弁体の突部３９ｂと回転軸の取付部４０ａを一体化するために、突部３９ｂと取付部４０ａを重ね合わせた部分に溶接による溶接部１を設ける。溶接部１は、突部３９ｂと溶着した第１の溶着部Ｍ１と、取付部４０ａと溶着した第２の溶着部Ｍ２と、第１の溶着部Ｍ１と第２の溶着部Ｍ２との間に挟まれ、突部３９ｂと取付部４０ａが分離し、突部３９ｂ及び取付部４０ａと溶着しない非溶着部Ｕ１とを備える。また、溶接部１に隣接して、非溶着部Ｕ１と突部３９ｂの孔３９ｃの内周面と取付部４０ａの外周面とで囲まれる非溶着隙間７が設けられる。【選択図】図９