Patent GB-1110163-A (GB)
Title: Improvements in or relating to rotary piston machines
IPC: F01C19/10
Filed: 1964-07-09
Abstract: 1,110,163. Rotary piston machines; reciprocating pumps. K. EICKMANN. July 9, 1964, No.57162/66. Divided out of 1,110,161. Headings F1A and F1F. A rotary piston machine comprising a threesided hollow piston mounted eccentrically on a driving or driven shaft for planetary rotation within a casing having a two-lobed inner profile to provide a plurality of variable volume working chambers, includes at the piston corners axially extending slots slidably mounting vane assemblies provided with pivotable slippers which slide along the said inner profile to seal adjacent working chambers from each other. Described as a rotarypiston I. C. engine, a casing 1, Figs. 1, 2, comprises a casing element 8 having a two-lobed inner surface 12 formed by two semi-cylindrical parts connected to each other by plane or curved surfaces and end covers abutting opposite faces of the element 8 and bearingly supporting a shaft 62 having an eccentric portion 62A mounting a three-sided piston 94 flanked on opposite sides by side-walls 4, 5, extending radially beyond the piston 94 to abut side faces 60, 61 of the element 8. The side-walls 4, 5, are in turn flanked by side covers 6, 7 bearingly supported by the end covers, with the side cover 6 formed with a ring gear 333 which coacts with a pinion 222 secured to the shaft 62 to constrain the piston 94 to planetary rotate within the element 8. Cover rings 6A, 7A about the side-walls 4, 5 are urged by fluid pressure to sealingly abut the side faces 60, 61 of the element 8. Each corner of the piston is formed with an axially-extending slot 57 which extends axially into or through the piston sidewalls 4, 5 and slidably mounts a vane 9 comprising axial extensions 15, 16 a pivot pin 10 and a slipper 11 in continuous sliding engagement with the inner surface 12 of the element 8. Three different constructions of vanes are shown at the three corners of the piston 94 in Fig. 2. The engine includes an inlet port 79 through which air or a gaseous airfuel mixture is admitted, ignition means 83 and an exhaust port 80 through which spent gases are expelled. The piston corners also include radial axially-extending slots forming chambers 28A, 28B, 28C slidably mounting further vanes 809 which pivotally mount slippers 811 controlling the opening and closing of radial ports 812 fitted with non-return valves 111 and communicating with an axial shaft bore 81B leading to an outlet port 54. Between the vanes 809 are intervane spaces 26A, 26B, 26C which communicate through a port 532 with the space 56 between the rotor and casing which in turn through a duct 81A communicates with an inlet 53 through which, e. g., liquid coolant is admitted. The coolant after passing into the spaces 26A, 26B, 26C and pumped therethrough and passes out through the radial ports 812 and the bore 81B to the outlet 54. Coolant spaces 73A, 73 may be provided in the rotor 94 and its side walls 4, 5 respectively. Each chamber 28A, 28B, 28C includes a port 802A, 802B, 802C respectively co-operable with arcuate recesses in a control disc 7C so that a further flow of, e.g., coolant can be pumped by the reciprocation of the vanes 809, each vane reciprocating twice for each revolution of the piston 94. Working chambers 27A. 27B, 27C are also provided beneath the vanes 9 through which lubricant can circulate to lubricate between the vanes 9 and slots 57, slippers 11 and inner surface 12 and between the side faces 60, 61 and side faces on the rotor side walls 4, 5. Pressure fluid is also admitted to an annular chamber 7X at the rear of the control disc 7C to urge the side covers 6, 7 side walls 4, 5 and rotor 94 into sealing engagement. Any carbon deposit in the engine working chambers 25A, 25B, 25C occurring through combustion or from the lubricant is thrown radially outwards by centrifugal force and is removed from the side faces of the sidewalls 4, 5 by scraper blades and collected in recesses in the side-walls from whence it may be removed through a port 888 in the engine casing. In another embodiment, Fig. 9 (not shown) instead of operating primarily as an I. C, engine, chambers (125A), (125B), (125C) may be used as a pump or compressor. The casing element (108) includes an inlet (153A) and an outlet (154A) fitted with non-return valves at the locations of the inlet 79 and outlet 80 and a similar inlet (153B) and outlet (154B) on the diametral opposite side of the element 108. The casing element may be made in two halves separated by an axially-extending plane through the minor axis of the inner surface (112) with an inlet and outlet located in each half of the casing element (108). In this embodiment the vanes 809 and the chambers 28A, 28B, 28C in which they slide together with the intervane spaces 26A, 26B, 26C are excluded. In a further embodiment the side walls 4, 5 and side covers 6, 7 are omitted. In this embodiment, Fig. 11 (not shown), the casing element (201) is divided into three parts (201A), (201 B), (201C) separated by planes (2301), (2302), the parts (201A), (201B) having semicylindrical inner profiles (2312A), (2312B) connected by planar surfaces (2312C) on the part (201C).