| 摘要 |
An improved drive train for coupling a motor to a signal generating, rotary type valve in a logging-while-drilling tool. The drive train includes a double planetary, speed reducing transmission, the input shaft of which is coupled to the motor by an automatically releasable clutch to prevent damage in the event the valve becomes jammed. The output shaft of the transmission is coupled to the rotor of the valve by means of a flexible coupling which reduces the reversing peak torque loads created by operation of the valve.
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