Patent GB-187952-A (GB)
Title: Improvements in hydraulic couplings and change speed gears
IPC: F16D31/06
Filed: 1922-09-27
Abstract: 187,952. Wingquist, S. G. Oct. 25, 1921, [Conveavtion date]. Clutches and speedvarying mechanism. - Hydraulic couplings and change speed gears comprising two or more sliding-vane pumps are provided with hydraulic controlling means operated by the pressure in the gear. In the form illustrated in Fig. 1, the driving shaft 1 carries a rotor 2 co-operating with a sliding-vane retor 9 on the driven shaft 7 and with a member 14 also provided with sliding vanes on a sleeve 15 having a brake drum 16. having a brake drum 16. The capacity of the pump device constituted by the members 2, 14 is varied by adjustment of the abutments 3, 4, Fig. 2, and the members 19, the adjusting means comprising slides 23, 29, having a tongue-and-groove connection with the members 19, and with slides 27 integral with or supporting the abutments. In a modification, the abutments are adjusted only by springs 26. The slides 23, 29 are operated by a piston 32 acted on by a spring 49 and by liquid pressure through passages 38, 39, provided with valves 40, having operating arms 45, Fig. 4, normally drawn inwards by springs 47. When the driving shaft 1 is at rest, a communication is open between the pressure and suction chambers of the pump 2, 9, the slides 23, 29 are in the. position shown so that the capacity of the pump 2, 14 is zero and the valve 40 opens communication between the pressure chamber of the pump 2, 9 and the passage 39. After the shaft 1 exceeds a predetermined number of revolutions, tha communication between the pressure and suction chambers of the pump 2, 9 is closed by centrifugally-operated valves 57, and the pressure in the pressure chamber acts on the piston 32 to impart capacity to the pump 2, 14, the movement of the slides 27 or of independent slides, moving at the same or a different rate, setting the pressure chambers of the two pumps into communication through openings 56. At the same time, the piston 32 acts through its rod 33 and a connection 54 to apply a brake 17 to the drum 16, to hold the member 14 stationary, and the shaft 7 is driven at a speed depending on the capacity of the pump 2, 14, which is determined by the pressure in the pressure chamber of the pump, which varies with the load on the shaft 7. When the speed of the shaft 1 further increases beyond a second predetermined value, the arms 45. Fig. 4, move outwards and operate the valves 40 so as to put the passages 39 into communication with the suction chamber of the pump 2, 9; the communication between the two pumps is therefore cut off, the capacity of the pump 2, 14 returns to zero, the member 14 is set free to rotate, and the shaft 7 rotates a.t the same speed as the shaft 1. The valve arms 45 may have teeth 59, Fig. 9, adapted to mesh under these conditions with corresponding slots in the rotor 9, or in both rotors 2 and 9; or separate toothed coupling arms may be provided. Further the valve arms 45, 57 may be coupled so as to move simultaneously and with the same speed. The Specification as open to inspection under Sect. 91 (3) (a) comprises also statements that the invention is applicable to gears comprising piston pumps with adjustable stroke, gears comprising one pump device only, and to gears in which the pumps are of invariable capacity. This subject-matter does not appear in the Specification as accepted.