GB1098854A - Rotary internal combustion engine - Google Patents

Abstract

1, 098, 854. Rotary-piston internal combustion engines. R. BOOCOCK AND A.J. MATHEWS. Nov. 18, 1964 [Nov. 19, 1963; Jan.31, 1964], Nos.45576/63 and 4117/64. Heading F1F. A rotary-piston I. C. engine using either spark (or compression) ignition, comprises rotors A, B mounted for rotation in the same direction in respective cylindrical casings A2, B2 on parallel shafts A1, B1. Each piston includes identical lobe portions A3, B3 and heel portions A4, B4 which co-operate with outwardly sliding abutments G1, G3 and a common abutment G2. In the Figure, exhaust of burnt gases through port EPA is almost complete, air-fuel mixture is being sucked in through port IPA to casing A2 below the abutments G1, G2, gas expansion in casing B below abutments G2, G3 is complete and exhaust of burnt gases has commenced through port EPB, and sucking of air-fuel mixture through port IPB has just commenced. The compression of a previous charge has been completed above the abutment G3 in casing B2 and this charge is being transferred through passage TPB, where it is fired by a plug S into casing A2. On further rotation of the pistons, the port EPA and transfer passage TPB are closed so that compression of the charge in casing A2 below abutments G1, G2 commences as also does expansion above abutment G2. In casing B2, exhaust below abutments G2, G3 and suction above abutment G3 continues. On rotation of the pistons through 180‹, compression in casing A2 below abutments G1, G2 is completed and the charge is fired in passage TPA and transferred to casing B2. At the same time full expansion of a previous charge has taken place in casing A2 above abutments G1, G2, and suction and exhaust above and below abutments G2, G3 in casing B2 are almost complete. Thus each piston in one complete revolution carries out the four phases of suction, compression, expansion and exhaust. The abutments Gl, G2, G3 are preferably actuated by a ring cam synchronized with rotation of the pistons to give positive movement to the abutments. Small vanes or other seals may be provided either on the pistons or in the casing walls. The shape of the pistons may vary according to engine requirements such as the type of fuel being used, ignition means or compression ratio. In an inline arrangement of pistons the assymmetrically positioned single lobes on each piston will require balancing. The pistons may be mounted coaxial with the pistons 180‹ out of phase to thereby balance the pistons. In another embodiment, each piston has three lobes resulting in six firings per revolution. The pistons in this instance will be naturally balanced. Any desired number of paired pistons may be mounted on the same output shaft in the same or separate housings.