Patent GB-190813949-A (GB)
Title: Improvements in and connected with the Hydraulic Transmission of Power.
Inventor: HELE-SHAW HENRY SELBY
Filed: 1908-07-01
Granted: 1909-10-01
Abstract: 13,949. Shaw, H. S. Hele-. July 1. [Cognate Applications, No. 19,292, A.D. 1908, dated Sept. 14, No. 25,970, A.D. 1908, dated Dec. 1, and No. 1620, A.D. 1909, dated Jan. 22.] Revolving - cylinder pumps. -Hydraulic power-transmitting mechanism comprises (1) a pump element in which a number of pistons are forced into their corresponding cylinders by a variably eccentric "floating ring," (2) a stationary valve, and (3) a motor element, similar in construction to the pump element. The unattached outer ends of the pistons co-operate with rings rotatable about the movable axis by means of rollers or slippers. Means are provided for balancing the fluid pressure on the cylinder bodies. Fig. 1 shows a sectional front elevation and Fig. 2 a sectional side elevation of one form of the apparatus. The pump element P is formed of a number of cylinders 1 arranged radially around the valve 3, and the corresponding pistons are operated through their contact with the ring 22 when the shaft 15, which is connected with the cylinder bodies, is rotated. The liquid forced passes through the ports of the stationary valve to the motor element M, the cylinder bodies of which are connected to the shaft 9. The speed of the driven member is controlled by the eccentricity given to the second floating ring 23. The eccentricities of the floating rings are separately varied by means of the rotatable eccentrics 30 which cause the movement of the non-rotatable rings 26, 27. There may be three sets of cylinders side by side in each of the floating rings. The valve is formed of a tube 3 with; mid-partition 8 running throughout, which is formed as a bearing for the solid transmission shaft 9. This shaft may be directly clutched to the shaft 15 when both members are running at the same speed. In order to keep the rollers on the piston-heads in contact with the floating rings 22, 23, rings 20 are provided which engage the piston-heads. The speed of the driven shaft may thus be varied by varying the eccentricity of either or both of the floating drums. A modified apparatus is shown in Fig. 3, in which the pistons point in the opposite direction, and the central valve is replaced by an annular equivalent 41 provided with diaphragms 42. The cylinders are arranged in a double row, preferably staggered, and the rollers 48 on the piston-heads run on the floating drum 49, the eccentricity of which may be varied through the medium of the sliding rods 52. A further modification is shown in Fig. 7, in which the sides of the cylinders 59 are provided with ports 58 co-operating with ports 57 in the dividing partitions provided in the interior casing of the apparatus. Packing-rings 60 prevent leakage, and the pistons are kept in their relative positions by rings 66, or the pistons may be kept up to their work by means of springs. In order to regulate the resultant forces acting on the revolving-cylinder body which tend to make it bind upon the circular valve in the forms shown in Figs. 1, 3, and 11, suitable recesses 73 are cut in those portions of the valve 3 or equivalent casing 41, on either side of the port openings. These recesses are covered by the overlapping portions of the cylinder bodies and are each connected by passages with the opposite side of the partition of the valve by passages 74, shown in Fig. 13. In the apparatus shown in Fig. 7, the pressure is balanced on both sides by cutting recesses 75 in the fixed surface opposite the actual port equal in area to the port itself. In the simple form of apparatus shown in Fig. 11, the shaft passes through the stationary valve as before. The radial cylinders 79 rotate around the valve, and the pistons have roller heads 83 bearing on the eccentric rings 82, which are laterally movable but non-rotatable. The piston-heads practically enclose the rollers, and a channel is cut to allow the liquid to act upon the roller. The segmental recesses 85 are of such an area that the liquid pressure acting on the rollers exactly balances the reactive forces transmitted from the eccentric rings, so that the pins 84 are relieved from great stress. The same effect may be produced if a small piston, such as 89, Fig. 15, contained within the body of the larger piston is made to transmit fluid pressure to the back of a slipper or roller, a small inlet valve 91 being provided to make up any liquid deficiency in the space behind the slipper or roller. Fig. 14 shows another form of the apparatus in which the driving-wheel is placed at the centre and the hydraulic elements P, M on either side, the liquid passing through pipes 93. Where balanced rollers are provided as in Fig. 11, they may be given an endwise movement, for example, by providing cam surfaces on the inner faces 94 of the walls of the channel between which the rollers run. Instead of fixing the cylinders of one device to the central shaft and the cylinders of the other device to a driving-sleeve, the cylinders of both devices may be attached to sleeves rotatable on the central solid shaft, suitable clutching-devices being provided for clutching either or both devices to the central shaft.