Patent GB-486105-A (GB)
Title: Improvements in and relating to hydraulic transmission gears
IPC: F16D31/06
Filed: 1936-08-28
Abstract: 486,105. Hydraulic transmission of power. CHRISTLEIN, W. F. Aug. 28, 1936, No. 23625/36. [A Specification was laid open to inspection under Sect. 91 of the Acts, Aug. 6, 1937.] [Class 69 (ii)] In a hydraulic transmission gear having rolling abutments on one member, and radial vanes on the other, said radial vanes are adjustable so as to control the transference of liquid and thus the transmission ratio. In one form, Figs. 1 and 2, the rotor casing 8, 11, 12, 16, which is keyed on the driving shaft 52, carries two rolling abutments 30, 31, each provided with a single recess ; the rotor 17 which is preferably integral with the driven shaft 5, carries two vanes 18, 19, which are adjustable radially by means of a control rod 23 and pivoted levers 27 each having a slot 28 so shaped that during retraction of the vanes the initial movement is slower than the subsequent movement. Recesses 41, 42, 43, 44 in the rotor 17 reduce its mass and servo for storage of oil ; liquid leaking from the pressure spaces 47, 49 past the bearings collects as a centrifugal ring in the space 57 between the end cover 8 and intermediate part 16 and passes back through ports 39, 40 into the suction spaces 48, 50; the stuffing-boxes 9 and 59 are relieved by connecting them to the said suction spaces ; air is vented in the space 57. The vanes and associated parts can be removed as a whole from the rotor, being retained in position by a ring 45 held by screws 81, 82. In cases where the driven shaft may over-run the driving-shaft, as e.g. in motor vehicles, the ports 39, 40 are provided with non-return valves. In a modification, Fig. 3, each vane comprises a fixed member 63 having peripheral tooth-shaped gaps 64 and a triangular aperture 65 which is provided with upwardly extending triangular notches 66, and a valve plate 62 pivoted at 61 and adjusted as in the previous construction. In a further modification, Figs. 4 and 5, the driving rotor casing carries five rolling abutments 68, 69, 70, 71, 72 each provided with a pair of recesses and each having a gear wheel engaging with a gear wheel 37 on the driven shaft, the ratio of the diameters of the pitch circles 96 .. 100 of the abutment gear wheels to the diameter of the pitch circle of the gear wheel 37 being such that the peripheral velocity of the abutments is higher than that of the rotor, so that narrow recesses may be used ; the abutment recesses and the tips of the vanes engaging therewith may have toothed profiles. The driven rotor carries four vanes 92 .. 95 adjustable radially by the rod 23 ; in addition to the manual control, an automatic adjustment is provided, the pressure in the pressure spaces acting on a piston face 103 on the control rod and that in the suction spaces on a face 104 ; when the load increases, the pressure difference increases and the centrifugal force acting on the vanes decreases, whereby the vanes are moved inwardly, and vice versa. The stuffing box 9 is relieved by connecting it by a passage 111 to the suction spaces. The stuffing box 108 is also relieved. In a further modification, Fig. 6, the radial vanes 124, 125, 126 are adjustable about a radial axis ; each vane arrangement may comprise a number of swivelling blades ; as shown in Fig. 8 these blades may be curved, and direct the liquid against the side walls ; alternatively, as in Fig. 11, the blades may be straight, one half of them being pivoted at one edge, and the remaining half at the other edge, so that the streams impinge thus eliminating axial thrust. In a further modification, Fig. 12, the driving rotor 131 carries four rolling abutments 132 .. 135 ; the rotor casing 140 carries a part 141 having resilient tongues 142 which open and close in accordance with the pressure exerted on them, to give automatic regulation ; alternatively, blades 146 may be adjusted by a piston 143 working in a cylinder 144 supplied with fluid pressure from an external source ; a further alternative form comprises a vane 147 sliding in a slot 148, being adjusted by a pistion 143 the opposite faces of which are subjected to the pressures in the pressure and suction spaces, so as to give automatic regulation. In a further modification, Fig. 13, each of the four rolling abutments 166 carried by tho driving rotor 131 carries a gear wheel 183 meshing with an internally toothed gear 184 on the driven rotor casing 140 ; three vanes are carried by the said casing 140, being adjustable axially by means of a control bar 179 and hollow sleeve 178 to vary the flow passages 180, 181. Leakage is collected in the space 185 which communicates through bores 186, 187 with the suction spaces ; the stuffing box 188 and packing rings 189 are thus relieved. In a further modification, Fig. 15, the driving member 190 carries abutments 191 each provided with a recess 197 and rotated about a radial axis by means of a bevel wheel 200 meshing with teeth 201 on the driven member 202 which carries vanes 203 pivoted thereto at 204, and automatically moved towards the closed position as the speed of the driven member increases by means of centrifugal masses 205; alternatively, the vanes may be adjusted at will by displacement in the axial direction. The Specification as open to inspection under Sect. 91 describes a hydraulic transmission gear, Fig. 13 (Cancelled), in which the driving rotor 131 carries three radial vanes 152, 153, 154 forced outwardly by centrifugal force ; grooves 157, 158, 159 in the vanes place the inner ends of the vanes in communication with the suction spaces so as to oppose the centrifugal force acting on the vanes, thus reducing' the bearing pressure at high speeds ; the rotor casing 140 carries two slide members 160, 161 for regulating the transfer of liquid from the pressure to the suction spaces, these members being adjustable by means of gear wheels 164, 165. This subject-matter does not appear in the Specification as accepted.