GB191314590A - Improvements in Internal Combustion Engines. - Google Patents

Abstract

14,590. Pieper, H. June 28, 1912, [Conventio i date]. Reversing.-In a four-stroke-cycle engine inlet and exhaust ports 17, 18, Fig, 2, are overrun by the piston near the end of the out-stroke, these ports being placed in communication with the inlet and exhaust pipes by a piston valve 11 ; the two ports 17, 18 may be replaced by a single port. The opening and closing of both inlet and exhaust are controlled solely by the working piston, and the piston valve 11 is timed so that the engine works in either direction without adjustment of the valvegear. The gases remaining in the cylinder at the end of the exhaust period are compressed on the up-stroke and re-expanded, a new charge being then drawn in owing to the cooling of the gases in the cylinder. The exhaust gases may however be withdrawn by a fan, or by any other means. Fig. 2 shows an arrangement in which a very rich mixture is drawn into the cylinder through an automatic valve 21 during the down-stroke, owing to the cooling or the withdrawal of exhaust gases, and the air necessary for combustion is admitted under pressure at the end of the stroke from a reservoir 25. This air is compressed in an annular pump chamber 23 and is delivered to the reservoir 25 at the end of each up-stroke through a groove 20 in the pump piston. The valve 11 may be replaced by two valves on the same spindle. The Specification as open to inspection under Section 91 (3) (a) states also that a rotary valve may be used in place of the piston valve 11 ; this subject-matter does not appear in the Specification as accepted.