Patent GB-1008301-A (GB)
Title: Improvements in or relating to devices for measuring the output torque of a hydrokinetic transmission
IPC: F16H41/24
Filed: 1962-07-03
Abstract: 1,008,301. Measuring torqueFRANCAISE DU FERODS S.A. July 3, 1962 [July 7,1961; March 6, 1962],No. 25520/62. Heading G1W. A device for measuring the output torque of a torque converter, including a pump 10 coupled by an end plate 15 to a driving shaft 11, a turbine 12 coupled to a driven shaft 12 and a reactor 14, comprises a chamber containing two centrifugal members with speeds equal or proportional to those of the driving and driven shafts, at least one passage connected each of the centrifugal members, and extending from the central portion to the periphery of the chamber, and means for measuring the difference between the pressures of the inner ends of the passages connected to the centrifugal members. The centrifugal members may be the pump 10 and turbine 12. In this case pressure collecting passages 16 are as associated with the turbine 12 and may be arranged as a series of radial tubes 26, Fig, 10, or by the spaces between two concentric plates divided up by ribs 62. The passages 16 communicate with a space C and thus with a conduit 22. Pressure collecting passages associated with the pump 10 are shown on the end plate 15 and communicate with space D and thus with a conduit 23. As an alternative to the passage 17, passages 17<SP>1</SP> may be used and these communicate with <SP>1</SP>a conduit 23<SP>1</SP> through a space D<SP>1</SP>. The oil renewal circuit of the converter is formed by a conduit 20 leading to a space A communicating with the pump 10 and back through a space B to a conduit 21. The pressure collecting passages do not form part of the oil renewal circuit and thus have little or no flow of oil, unless two concentric plates are used, where pressure losses will be small. The difference in the pressures collected by the passages 16 and 17 or 17<SP>1</SP>, Fig. 2, gives an indication of the output torque of the converter and this pressure difference is measured by applying the pressure from the conduit 22, P c , to a surface 47 of a piston 42, and the pressure from the conduit 23, P D , to a surface 49 of a piston 43. A pump 30 feeds oil from a tank 31 via a regulating valve 31, to the conduit 20 and also feeds oil through a conduit 37 to a surface 50 of the piston 43 causing pressure leakage through a space 51 dependent on the difference in pressures between the conduits 22, 23 (P c  -P D ) The pressure on the surface 50 is measured by a gauge 53. The pistons 42, 43 are fed through a reversal valve so that if the pressure P D  rises above the pressure P c , then P D  will be applied to the piston 42 and P c   to the piston 43 so that the gauge 53 gives a continuous indication of torque passing through a minimum as P D  increases relative to P D . A valve 70, Fig. 4, may be included in the measuring circuit to ensure that the pressure indicated by the gauge 53 never falls below a predetermined minimum level, the gauge then being arranged to show variations of torque from the desired point of sensitivity. In Fig. 13, the pressure collecting passages are formed in two centrifugal members 92, 93 in an oil filled chamber 94 and driven through transmissions 100, 99 from the driven and driving shafts 13, 11 respectively. The torque is found from the pressure difference between the conduits 103, 104 measured as before.