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    • 9. 发明公开
    • Locking clutch for downhole motor
    • Sperrkupplungfüreinen Bohrlochmotor
    • EP1988252A2
    • 2008-11-05
    • EP08155183.0
    • 2008-04-25
    • SMITH INTERNATIONAL, INC.
    • Underwood, Lance D.Beylotte, James Edmond
    • E21B4/00E21B4/02
    • E21B4/006E21B4/02
    • A locking clutch (200) to selectively transmit torque from a stator (204) of a downhole tool to a rotor (202) of the downhole tool (201) includes at least one locking pawl (208) disposed upon the rotor (202), wherein the at least one locking pawl comprises a load path, a pivot axis, and a mass center, wherein the at least one locking pawl (208) is biased into an engaged position by a biasing mechanism (214), wherein the at least one locking pawl (208) transmits force from the stator (204) to the rotor (202) along the load path when in the engaged position, and wherein centrifugal force urges the at least one locking pawl (208) into a disengaged position when the rotor (202) is rotated above a disengagement speed.
    • 选择性地将扭矩从井下工具的定子(204)传递到井下工具(201)的转子(202)的锁定离合器(200)包括设置在转子(202)上的至少一个锁定爪(208) 其中所述至少一个锁定爪包括负载路径,枢转轴线和质量中心,其中所述至少一个锁定爪(208)通过偏置机构(214)被偏压到接合位置,其中所述至少一个 当处于接合位置时,锁定爪(208)沿着负载路径将力从定子(204)传递到转子(202),并且其中离心力在至少一个锁定爪(208)转动时将该至少一个锁定爪(208)推入分离位置 (202)旋转高于分离速度。