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    • 5. 发明授权
    • Rotary drill bit with rotary cutters
    • 带旋转刀的旋转钻头
    • US4258806A
    • 1981-03-31
    • US42925
    • 1979-05-29
    • Heinrich KunkelArmin OlschewskiManfred BrandensteinLothar WalterHorst M. Ernst
    • Heinrich KunkelArmin OlschewskiManfred BrandensteinLothar WalterHorst M. Ernst
    • E21B10/20E21B10/22
    • E21B10/22E21B10/20
    • A rotary drill bit having a drill bit body and at least one trunnion projecting from the drill bit body and a rotary cutter supported on at least one pair of radial rolling bearings on the trunnion. The rolling elements of at least one bearing are guided on at last one axial end facing the drill bit body in an outer bearing race groove incorporated in the bore of the rotary cutter. The inner bearing groove is formed on the trunnion for the rolling elements of the radial roller bearing. A filling opening is provided for assembly of the rolling elements comprising a channel which extends through the drill bit body and trunnion and is essentially axially oriented having one terminal end adjacent the inner bearing race groove and at least one filler piece for sealing the opening. The filling opening is arranged to provide a common filling means for each radial bearing.
    • 具有钻头体和从钻头体突出的至少一个耳轴的旋转钻头和支撑在耳轴上的至少一对径向滚动轴承上的旋转切割器。 至少一个轴承的滚动元件在结合在旋转切割器的孔中的外部轴承滚道槽中的最后一个面向钻头体的轴向端处被引导。 内轴承槽形成在用于径向滚子轴承的滚动元件的耳轴上。 提供了用于组装滚动元件的填充开口,该滚动元件包括延伸穿过钻头体和耳轴的通道,并且基本上轴向定向成具有一个靠近内部轴承座圈的终端和用于密封开口的至少一个填充件。 填充开口布置成为每个径向轴承提供常见的填充装置。