| 摘要 |
The invention relates to a braking assembly for permitting axial rotation of a shaft in a first direction and inhibiting axial rotation of the shaft in a second, opposite direction , comprising: a hydraulic clutch having a torque generating member and a torqu e receiving member wherein the torque generating member is connected to the shaft and th e torque receiving member is stationary and a guide means for maintaining the torque generating member in a first de-activated position when the shaft is rotated in the fir st direction and for moving the torque generating member to a second activated position when the shaft is rotated in the opposite direction whereby activation of the torque generatin g member inhibits rotation of the shaft in the second direction. The invention provides an effective emergency braking assembly for such systems as progressing cavity pumps in oil wells.
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