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    • 83. 发明授权
    • Ball-and-roller bearing
    • 滚珠轴承
    • US5338377A
    • 1994-08-16
    • US946638
    • 1992-09-18
    • Nobuaki MitamuraShigeru Okita
    • Nobuaki MitamuraShigeru Okita
    • C21D9/36C21D9/40C22C38/00C23C8/32C23C30/00F16C33/30F16C33/32F16C33/62C22C38/22C22C38/24
    • C21D9/40C21D9/36C23C8/32F16C33/30F16C33/62F16C2204/62F16C2204/64Y10S148/906Y10S384/912
    • In order to provide a ball-and-roller bearing that has a longer life and which exhibits higher reliability than the prior art products not only under lubrication in the presence of foreign matter but also under lubrication in clean conditions, according to the present invention, a bearing material that contains 0.2 to 1.0 wt % of carbon and at least 1 wt % in total of one or more elements selected from among chromium, molybdenum and vanadium is subjected to a carbonitriding treatment and a hardening heat treatment to make an alloy steel in which the area ratio of carbonitrides present in the surface layer of said bearing material per unit area is adjusted to be at least 10%, a maximum grain size of carbonitrides present in said surface layer being no more than 3 .mu.m, the content of retained austenite (.gamma..sub.R) in said surface layer being 25 to 45 vol %, and said surface layer having a surface hardness of at least 750 Hv. At least one of the races and rolling elements of the bearing is made of this alloy steel.
    • 为了提供一种滚珠轴承,其具有比现有技术的产品具有更长的使用寿命并且具有比现有技术的产品更高的可靠性,不仅在异物存在下的润滑下,而且在清洁条件下的润滑下,根据本发明, 将含有0.2〜1.0重量%碳和至少1重量%的一种或多种选自铬,钼和钒的元素的轴承材料进行碳氮共渗处理和硬化热处理,以使合金钢 其中存在于每单位面积的所述轴承材料的表面层中的碳氮化物的面积比被调节为至少10%,所述表面层中存在的碳氮化物的最大晶粒尺寸不大于3μm,保留的含量 所述表面层中的奥氏体(γR)为25〜45体积%,所述表面层的表面硬度为750Hv以上。 轴承中的至少一个座圈和滚动元件由该合金钢制成。