ROTARY MACHINE AND BEARING STRUCTURE FOR THE SAME

• Main Author: OOKA KEIICHIRO
• Format: Patent
• Language: English; Japanese
• Published: 13.09.2018
• Subjects: BEARINGS; BLASTING; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERATION; HEATING; LIGHTING; MECHANICAL ENGINEERING; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THERMAL INSULATION IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To prevent contact between a bearing body part and a rotor shaft step part adjacent thereto without increasing a size in an axial direction in a rotary machine.SOLUTION: A rotary machine comprises a rotor shaft 11 supported by two bearing structures 30 by two outer diameter contraction parts 11a and a rotary part provided thereto. Each of the bearing structures 30 comprises a bearing body part 31, a metal part for a bearing surface 32 and a bearing body end protective metal part 33. In the bearing body part 31 formed with a lubricating oil inflow groove and a lubricating oil discharge groove 31c, an end surface radial direction inside part 31e is formed so as to be recessed closer to an inside in an axial direction than an end surface radial direction outside part 31f. The bearing body end protective metal part 33 has material quality softer than that of a material of the bearing body portion 31 and the rotor shaft 11, and is provided on a surface of the end surface radial direction inside part 31e. At least a part of the surface protrudes closer to an outside in the axial direction than the end surface radial direction outside part 31f.SELECTED DRAWING: Figure 4 【課題】回転機械において、軸方向のサイズを増大せずに軸受本体部とそれに隣接するロータシャフト段差部間の接触を防止する。【解決手段】回転機械は、２つの外径縮小部１１ａで２つの軸受構造３０に支持されるロータシャフト１１とそれに設けられた回転部を備える。軸受構造３０は、軸受本体部３１と軸受面用メタル部３２と軸受本体端部保護用メタル部３３とを具備する。潤滑油流入溝と潤滑油排出溝３１ｃとが形成された軸受本体部３１は、端面径方向内側部分３１ｅが端面径方向外側部分３１ｆよりも軸方向について内側に窪むように形成されている。軸受本体端部保護用メタル部３３は、軸受本体部３１およびロータシャフト１１の材料よりも柔らかい材質であって、端面径方向内側部分３１ｅの表面に設けられ、表面の少なくとも一部は端面径方向外側部分３１ｆより軸方向外側に突出している。【選択図】図４