Patent GB-191221705-A (GB)
Title: Improvements in and connected with Fluid Pressure Apparatus.
Inventor: WALKER CHARLES LESLIE
IPC: F16H39/16
Filed: 1913-06-27
Granted: 1914-06-18
Abstract: 21,705. Walker, C. L. June 27, 1913. Revolving-cylinder pumps; valves and valve seats, arrangement of.-In a fluid-pressure apparatus having a number of parallel or radially-arranged pump or motor cylinders, the distribution is controlled by a disk valve having an even number of alternately-arranged pressure and return ports and connected to the cylinder barrel by an intermediate toothed eccentric member. There is a difference of one between the number of pressure or return ports and the number of cylinders. Either the cylinder barrel. the intermediate member or the valve may be held stationary. If the cylinder barrel is stationary, the valve revolves in the same direction as, or in a direction contrary to, the direction of the shaft according as the number of pressure or return ports is greater than or less than the number of cylinders. If the intermediate member is normally stationary, the speed of the valve is less than or greater than that of the cylinder according as the number of pressure or return ports is greater or less than the number of cylinders. If the valve is required to remain stationary, the cylinders revolve slowly and the intermediate part gyrates rapidly. A construction suitable for a liquid-pressure swashplate apparatus of the kind described in Specifi cation 14,956/12 is shown in Fig. 2. The valve 10 is held in liquid-tight contact with a plane-surfaced seat on the cylinder barrel 1 by pressure in an annular chamber 10<b> containing a cup-leather packing. The pressure and exhaust passages p, r, are arranged as shown. A sleeve 15 mounted on an extension 11<b> of the casing 11 has an eccentric part 15<a> and a. toothed segment 15<b> which carries a lever adapted to engage one of two stops on the interior of the casing. A toothed ring 19 mounted on ball bearings is secured to a sleeve 1<a> secured to the cylinder barrel. A ring 16, provided with an equal number of internal and external teeth, is mounted on the eccentric 15<a> and engages concentric teeth 10<a>, 13<a> on the valve 10 and ring 19 respectively. To reverse the apparatus, the eccentric part 15<a> is turned 180 degrees by means of the member 17 acting through a toothed pinion 18 and the toothed segment 15<b>. In the construction shown in Fig. 6, the stationary valve has pressure and return chambers each connected to six valve ports in the seat 1<a>. The barrel 4 is secured to shaft 5 is mounted in ball bearings 4<a>, 5<c>, and is provided with seven radial cylinders. The gyrating member 7 has an equal number of internal and external teeth 7<b>, 7<a>, engaging concentric teeth 5<b>, 6<c>, on the enlargement 5<a> and a normally stationary ring 6<b> respectively The ring 6<b> may be made movable for reversal purposes. The cylinders contain pistons 4<c> which have ducts leading to cups or sockets containing balk. The barrel is held to its seat by a spring 1<b> which acts on a flanged ring 1<e> acting on the barrel through a roller bearing. The disk 1<c> has an annular balancing- recess 1<g> backed by a U-leather joint. Six double strokes cause one revolution of the shaft 5, and the axis of the gyration member describes circles in the opposite direction. In the construction shown in Figs. 7 and 8, the valve 1 is stationary, and a balancing-element 11 is provided which makes one revolution while a point in the axis of the revolving gyrating element 7 describes a circle. Seven cylinders are provided in the barrel 4, the ends of which communicate with ports 5<a>, 5<d>, adjacent to the valve. Internal teeth 6<b> are provided on rings 6 secured to the stationary casing 6<a>. The gyrating member 7 with axis 7<a> is made in halves secured by pins 7<b> and stays 7<c> over which are revolvably fitted eccentric blocks 8 mounted in openings in the barrel 4. The halves are provided with external teeth 7d which mesh with teeth 6<b>. The member 7 has concentric inner and outer tracks 9, 9<a> which are engaged by rollers 10<b> carried by crosspieces 10<a> secured to the double-acting pistons. The balance weights 11 have eccentric bodies 11<a> rotatably fitted within the gyrating member 7 and concentric openings rotatably fitted over the middle extensions of the barrel 4. The barrel is held to the valve by a spring 14 and fluid-pressure acting in the recess 12.