| 摘要 |
1498699 Torque responsive brakes TELECO Inc 21 July 1975 [24 July 1974] 30439/75 Heading F2E A torque limiting device comprises driving and driven shafts 1 and 4 respectively, plates 2, 3 on the ends of the shaft, rolling elements 5 located between the plates in grooves of progressively increasing depth and width, the grooves extending in opposite circumferential senses in the two plates, a spring 8 rotatable with the driven shaft urging the plates together and a disc brake 12, 13 for the driven shaft operable when an increase in driven shaft torque causes relative angular movement between the shafts which is converted by elements 5 into axial movement of the driven shaft. Elements 5 may comprise balls or truncated cores. The device may be turbine driven and arranged to drive a hydraulic pump (Fig. 4, not shown) which supplies oil to a device for restricting the flow of drilling mud so as to measure an unspecified well-drilling parameter. At the termination of the measuring period, the pump outlet is throttled and the resulting backpressure increases the driving shaft torque of the torque limiting device and the brake operates as described above. |
