Patent GB-190713894-A (GB)
Title: Improvements in Apparatus for Transmitting Motion at Variable Speed.
Inventor: JANNEY REYNOLD
Filed: 1907-06-15
Granted: 1908-06-15
Abstract: 13,894. Janney, R. June 15. Revolving-cylinder pumps; actuating; stroke, varying.-Relates to hydraulic apparatus for transmitting motion at variable speeds, wherein a duplex pumping system is employed, one part for the driving and the other for the driven member and wherein the pump cylinders are arranged in a rotating cylindrical body discharging into and fed from a central valve plate, the pistons being operated through a swash-plate of varying inclination. The invention consists mainly in rendering the action of such apparatus more uniform. Fig. 1 shows the shaft 3 carrying the cylinder barrel 29 which bears on the face of the valve 13. The apparatus on the other side of this plate is almost identical and is arranged on the shaft 9. The plate 13 is provided with two ports 14, shown in Fig. 2, having sections at the end which are reduced in area, such as the V-shaped channels a, b, c, d, for the purpose of making the communication with the cylinders more gradual. The ports 32 of the cylinder 30 are smaller in area than the cylinders themselves and are preferably lengthened in the direction of rotation. The rods 34 actuating the pistons 31 are secured at one end to the pistons and at the other to the socket ring 23, which is connected by a universal joint with the shaft 3 and is carried by the pivoted swash-plate 20. The pistons and connecting-rods are provided with central passages to permit of good lubrication of the rods. The socket ring is provided with a radial trunnion pin 36, shown in Fig. 10, and at the opposite side with an aperture for a trunnion pin 28, the outer end of which is secured by a conical split ring 82. The two trunnions so formed are secured in bearings 47 made partly by the universal joint ring 26 and partly by bearing-blocks 45, Figs. 11, 12, and 15, which are secured in place by screws s. The three axes formed by the trunnions 27, 36, 28 and those 74 of the plate 20 intersect at the same point. The inclination of the plate 20 is varied by means of a scroll disk 43, see especially Fig. 16<a>, engaging teeth 21. The plate 20 may be cushioned by connecting it to the piston 18 working in the dashpot 17. The cylinder barrel 29 is driven by the end of the shaft 3 by means of a key 91, of the shape shown in Fig. 19, which allows of slight rocking motion of the barrel. Relief tubes 16, Fig. 18, are provided to equalise slight pulsations arising in the two ports 14. These tubes are made of elastic metal and are connected with the ports by passages 77. In order to replenish the supply of circulating fluid, a port 67 connects both sides of the apparatus and leads into a chamber 95. A valve 65 opening inwards is arranged between this chamber and the adjacent mid-plate port 14. The plate 20 on the driven side of the apparatus may have a fixed inclination. In order to rotate either of the shafts independently, a pivoted lever 55 is arranged to operate the rod 63 and open the valves 65. The hand-wheel 51 actuating the scroll-disk 43 is provided with a slot to accommodate the end 56 of the lever 55, so that the valve 65 may only be opened when the driven member is stationary. Fig. 5 shows the cylinders r, t, u, w, z, s<1>, a' evenly spaced and the ports i, j, k, l, m, n, o, p, q unevenly spaced. The number of cylinders is odd in order to secure smooth working. Cylinders that are at the same distance from the cylinder a<1> have their ports similarly located. Another method of correcting the volumetric irregularities of the apparatus is by making the connecting-rods of different lengths. The circle of the cylinders may be of different diameter from the circle of sockets in the socket ring. Figs. 23, 24, and 25 show a modification in which the balls between the socket ring and swash-plate may be dispensed with. The socket ring 23<a> is provided with channels 23<b> which allow the liquid to enter the recesses 20<a> to form a fluid bearing. Fig. 23 also shows the cylinders on the driving side of the apparatus, of larger diameter but shorter than those on the driven side in order to give a greater range of speed. In place of the v-shaped extensions to the ports 14, an extension may be cut into the metal of the mid-plate and openings 14b, made as shown in Fig. 26. This Figure also shows the shifting of the mid-plate ports relatively to the median plane. In order to allow of the escape of air from the cylinder 30, ports 94<*> are connected with the ports 14 by channels 94<a> which are normally closed. Safety-valves 96 for relieving excess of pressure may also be fitted. To prevent accidental starting of the mechanism, a spring may be arranged to snap the end of the lever 55 into the slot in the wheel 51.