SINTERED BEARING AND MANUFACTURING METHOD

• Main Authors: MORI TOSHIHIKO, YOSHIZUKA NORIYOSHI, SATOJI FUMINORI, SUGAI YOSUKE
• Format: Patent
• Language: English; Japanese
• Published: 18.10.2018
• Subjects: BEARINGS; BLASTING; CASTING; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; POWDER METALLURGY; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS; WORKING METALLIC POWDER

PROBLEM TO BE SOLVED: To provide a sintered bearing having a bearing surface with high rigidity, capable of being manufactured at low cost, and having high dimension accuracy.SOLUTION: A sintered bearing 1 is formed by integrally molding an inside layer 2 and an outside layer 3, and has a bearing surface A on an inner peripheral surface 2a of the inside layer 2. The inside layer 2 comprises a sintered metal containing Fe and a highly rigid element (e.g. Ni, Mo). The outside layer 3 comprises a sintered metal containing Fe and not containing the highly rigid element. On an interface between the inside layer 2 and the outside layer 3, concentration gradient of the highly rigid element occurs.SELECTED DRAWING: Figure 3 【課題】高硬度の軸受面を有し、低コストに製造可能で、且つ、寸法精度の高い焼結軸受を提供する。【解決手段】内側層２と外側層３とを一体成形してなり、内側層２の内周面２ａに軸受面Ａを有する焼結軸受１であって、内側層２がＦｅ及び高硬度化元素（例えばＮｉ，Ｍｏ）を含む焼結金属からなり、外側層３がＦｅを含み高硬度化元素を含まない焼結金属からなり、内側層２と外側層３との界面に高硬度化元素の濃度勾配が生じている。【選択図】図３