Patent GB-1234932-A (GB)
Title: Improvements in or relating to rotary internal combustion engines of positive displacement type
Inventor: NILSSON HANS ROBERT
IPC: F01C19/10
Filed: 1967-06-07
Abstract: 1,234,932. Rotary internal-combustion engines. SVENSKA ROTOR MASKINER AB. May 29, 1968 [June 7, 1967], No. 26302/67. Heading F1F. A rotary I. C. engine comprises a stationary casing 20, Fig. 2, having end closures and a pair of parallel intersecting bores 24, 26 concentrically and rotatably mounting primary and secondary rotors 40, 46 to form between each rotor and the casing an inlet chamber which merges into a common working chamber which diminishes to a minimum volume and thereafter increasing to a maximum volume and divides into a pair of outlet chambers, with said chambers being continually closed in axial directions by sealing means movably located in one member and biased into direct contact with the co-operating surface of another of the members to provide continuously sealing between the lines of co-operation of the three members. The rotor 40 has at least three axiallyextending grooves and intervening lands having convex flanks and the rotor 46 a larger number of axially-extending grooves and intervening lands. As shown, the rotor 40 secured on an engine output shaft includes four grooves 48 and four lands 50 of convex epicycloidal form having a leading flank 136, Fig. 9 and a trailing flank 138 and the rotor 46 rotating through external gearing in synchronization with the ortor 40, which includes eight axially-extending grooves 52 with intervening lands 54. The grooves 52 include a circular arc 74, Fig. 4 and leading and trailing flanks 70, 72 respectively tangential to the arc 74 and parallel to a radius of the rotor drawn centrally through the adjacent land 54. Each land 50 at its crest 140 includes a T-shaped axially-extending groove 144 mounting a sealing strip 146 urged into sealing engagement with the bore 24 and with flanks of the rotor 46 by a spring, centrifugal force and gas pressure and on its flanks arcuate grooves 150 mounting sealing strips 152 urged into sealing engagement with the casing end covers by springs and gas pressure. The strips 152 at their crest ends are formed with tongues to overlap the ends of the strips 146 and at their other ends are slotted into an annular sealing member 156 mounted in an annular groove 154 peripherally adjacent the bases of the grooves 48. The lands 54 are each formed with axially-extending, angularly-disposed slots 84, 86 slidably mounting sealing strips 88, 90 which are urged by springs, centrifugal force and gas-pressure into sealing engagement with the bore 26 and with the flanks of the rotor 40. Arcuate grooves 108 mounting sealing strips 110 seal the end faces of the rotor 46 with respect to the adjacent end faces of the casing end covers. Pins 98 in oversize holes 96 prevent the strips 88, 90 being projected out of their slots when the rotor passes between points 28, 30 at the intersection of the bores 24, 26. After starting the engine externally, as from a blower (not shown) is admitted to inlet chambers 32, 34 which merge into a single working chamber by the intermeshing of a land 50 with a groove 54. When the working chamber is approaching its minimum volume, fuel is injected through an injector 62, the mixture is then compressed and fired by a spark-plug 64. The gases of combustion drive the rotors, expand into the working chamber which is now increasing in volume and exhaust into outlet chambers 36, 38. The exhaust gases are used to drive a turbine (not shown) which is coupled to drive the blower.