Patent ES-354784-A1 (ES)
Title: Rotary volumetric machine
IPC: F02B53/00
Filed: 1968-06-07
Abstract: A rotary-piston machine, comprising a piston of substantially oblong form having semicircular ends inter-connected by convex curves with the centres of the circular ends located on the major axis at equal distances from the piston centre, a transmission shaft coupled to and coaxial with the piston, a cylinder within which the piston revolves closed at its ends by discs and having three chambers cut in its inner periphery angularly spaced at 120 degrees from one another having a radius corresponding to the radius of the semicircular ends and three sealing rollers in sealing engagement with the piston periphery and located between adjacent chambers to isolate the chambers from one another, wherein the axes of the piston and cylinder are separated by a distance e which remains invariable throughout the rotation of the piston, the distance between each roller centre and the centre of the cylinder equals 5e + 3e#3, the distance between the centres of the semicircular ends equals 2e + 2#e, where #e equals e/cos 30 degrees, the length of the major piston axis equals 2R + 2#e + 2e and the length of the minor piston axis is 2R + 2#e - 2e where R is the radius of the semicircular ends and equals 5e + 3e#3- (#e + s) where S is the radius of the rollers. Described as an I. C. engine, cylinders 1, 2, Fig. 3, are arranged side-by-side on a common axis O with the cylinder 2 angularly displaced 30 degrees with respect to the cylinder 1. The cylinders are closed at their outer ends by discs 4, 5 supported in needle bearings 6 and separated by a disc 3 having three transfer passages 23, Fig. 6, each controlled by a rotary valve 24 having at its outer end a four-armed lever engaged by a double stop 13 so that as the cylinders and discs which are connected together for rotation by the spindles of the rollers 10 rotate the valves 24 rotate a quarter turn for each engagement of an arm by a stop. Within each cylinder a piston 9 secured to a common transmission shaft 7 is rotatably mounted. The pistons and cylinders are coupled together so that the speed of the pistons one and half times that of the cylinders, thus the piston effects a 270 degree angular movement whilst the cylinders effect an 180 degree angular movement. The cylinder 2 is angularly spaced in the clockwise direction with respect to the cylinder by 30 degrees and the piston in the cylinder 2 with respect to the piston in the cylinder 1 by 45 degrees. A gaseous fuelair mixture supplied from a carburetter is supplied via an intake manifold 27 which adjacent the disc 4 opens into an 180 degree arcuate recess cooperable with openings 23 through the disc 4 to the cylinder 1 where on rotation of the cylinder 1 and its piston 9 it is compressed. The compressed mixture is then transferred through the transfer passages 23 into the cylinder 2 in which cylinder it is fired by spark-plugs 25, Fig. 5 one to each chamber 20, on passing by contact 14 to rotate the piston 9 and transmission shaft 7. The discs 4, 5 include discs 28, 30 respectively of selflubricating plastics material resistant to heat and urged by springs (not shown) into sealing engagement with the respective cylinder end-face. The disc 3 includes hardened steel rings 15 loaded by springs (not shown) to again ensure lateral sealing of the cylinders. The rollers 10 may include oscillating bearing rings there-around or rings urged by springs to ensure a lubricating and sealing film of oil between the rollers and associated piston. The coupling between the rotors and cylinders may be by means of a gear fixed to and centred on the transmission shaft and an internal ring gear fixed to and centred on the common cylinder axis. The machine may also be used as a pump, hydraulic motor, air or gas compressor, heat engine or vacuum pump. The geometry of the machine is shown in Fig. 1. (For Figures see next page)