CRAWLER BEARING BUSH AND MANUFACTURING METHOD THEREFOR

• Main Authors: AMADA EIJI, MAEDA KAZUO, KONDO YUSUKE
• Format: Patent
• Language: English; Japanese
• Published: 05.07.2018
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; MOTOR VEHICLES; PERFORMING OPERATIONS; TRAILERS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide a crawler bearing bush capable of extending the life thereof and to provide a manufacturing method therefor.SOLUTION: A crawler bearing bush 40 has an annular shape including an inner peripheral surface 41, an outer peripheral surface 42, a first end face 43, and a second end face 44 located opposite the first end face 43 in an axial direction. The crawler bearing bush 40 comprises: an inner-peripheral-surface-side hard layer 41A formed including the inner peripheral surface 41; an outer-peripheral-surface-side hard layer 42A formed including the outer peripheral surface 42; a first-end-face-side hard layer 43A formed including the first end face 43 and having a thickness of 3 mm or greater from the first end face 43 of an area having a hardness of 63HRC or greater; and a non-hard area 49 lower in hardness than the inner-peripheral-surface-side hard layer 41A, outer-peripheral-surface-side hard layer 42A, and first-end-face-side hard layer 43A. The crawler bearing bush is made of steel.SELECTED DRAWING: Figure 5 【課題】その寿命を延ばすことが可能な履帯用軸受ブシュおよびその製造方法を提供する。【解決手段】履帯用軸受ブシュ４０は、内周面４１と、外周面４２と、第１端面４３と、軸方向において第１端面４３とは反対側に位置する第２端面４４と、を含む円環状の形状を有する。履帯用軸受ブシュ４０は、内周面４１を含むように形成される内周面側硬化層４１Ａと、外周面４２を含むように形成される外周面側硬化層４２Ａと、第１端面４３を含むように形成され、６３ＨＲＣ以上の硬度を有する領域の第１端面４３からの厚みが３ｍｍ以上である第１端面側硬化層４３Ａと、内周面側硬化層４１Ａ、外周面側硬化層４２Ａおよび第１端面側硬化層４３Ａよりも硬度が低い非硬化領域４９と、を備え、鋼からなる。【選択図】図５