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AssigneeDaido Metal Company Ltd.
InventorsTadashi Tanaka, Masaaki Sakamoto, Motomu Wada, Koichi Yamamoto, Hideo Ishikawa, Youji Nagai, Kenji Sakai
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A multilayer sliding material for high-speed engine, comprising a steel back metal, a Cu or Cu-base alloy plating layer, a Cu-Pb bearing alloy layer, and an overlay, said steel back metal having 155 or more of Vickers hardness and 42 kgf/mm.sup.2 or more of 0.2% yield strength, a Cu-Pb bearing alloy layer containing 15-30 wt % of Pb and 0.5-2.0 wt % of Sn and having 0.25 cal/cm.s..degree. C. or more of thermal conductivity, 75 or more of Vickers hardness and 18 kgf/mm.sup.2 or more of tensile strength, said overlay of a lead base alloy containing 2-8 wt % of Sn and 3-11 wt % of In and having more than 250.degree. C. of melting start temperature. The material has a superior antiseizure property at high speed of engine. In particular, the rising of the melting start temperature of the metal of the overlay and the thermal conductivity of the bearing alloy provides a superior sliding property of plain bearing at high speed of engine.
A multilayer sliding material for a high-speed rotation shaft, comprising a four-layer structure having a steel back metal, a plating layer of copper or copper base alloy bonded to the steel back metal, a Cu-Pb bearing alloy layer bonded to the plating layer, and an overlay of a lead base alloy bonded to the bearing alloy layer, the steel back metal having not less than 155 of Vickers hardness and not less than 42 kgf/mm.sup.2 of 0.2% yield strength, the Cu-Pb bearing alloy layer having not less than 0.25 cal/cm.s..degree. C. of thermal conductivity, not less than 75 of Vickers hardness and not less than 18 kgf/mm.sup.2 of tensile strength, the lead base alloy consisting of 2-8 wt % of Sn and 3-11 wt % of In and the balance Pb and incidental impurities and having more than 250.degree. C. of melting start temperature.
A method of producing a multilayer sliding material for a high-speed rotation shaft, comprising the step of sintering and rolling of a copper-lead-tin bearing alloy powder spread over the steel back metal having a plating layer of copper or copper base alloy bonded to the back metal to thereby produce a bimetal, the sintering and rolling being repeated so that a total reduction ratio of the repeated rolling is 7-35% with respect to the initial thickness of the steel back metal measured at a start of the sintering and rolling, the steel back metal of a final product having at least 155 of Vickers hardness and at least 42 kgf/mm.sup.2 of 0.2% yield strength, the Cu-Pb bearing alloy of the final product having at least 75 of Vickers hardness and at least 18 kgf/mm.sup.2 of tensile strength.
A high-speed rotation shaft capable of rotating at 9,000 rpm without seizure, said shaft comprising a multi-layer sliding material comprising:
Dependencies are inferred from the claim text.