Abstract:
439,426. Oil engines. RICARDO, H. R., 21, Suffolk Street, Pall Mall, London. June 6, 1934, Nos. 16817/34 and 13778/35. [Class 7 (iii)] At the end of the compression stroke of a compression-ignition engine in which part of the charge is forced through a tangential passage D in a plug C into a chamber B, not more than 50 per cent of the total combustion space is formed by the chamber B and the passage D, while the remainder is formed by the clearance between the piston G and the cylinder head A, which clearance is increased locally by a recess H adjacent the end of the passage D. The chamber B, which may be of spherical or cylindrical form, is located either in the cylinder head, Fig. 1, or in the cylinder casting, Fig. 7, whilst the recess is formed either in the cylinder head or in the piston. The recess may be formed as shown in Fig. 6, by a flat-bottomed triangular depression which is bulged outwardly adjacent the passage D, or as shown by the dotted line Hx as half an ovoid along the minor axis of which the gases issuing from the passage are directed. The recess H may be shaped so that the gases issuing from the passage D will be split into two portions, to each of which a rotary motion is imparted. As shown in Figs. 3 and 7, the gases enter a part-spherical depression H laterally adjacent two part-spherical depressions H , H , which may be situated symmetrically, and are split into two streams by a ridge H along which the depressions H , H merge. In the modified construction shown in Fig. 10, the gases enter one end of a trench H' and are split into two streams which rotate in flat-bottomed circular depressions H H , which may be symmetrically situated, by a rib H formed where the depressions merge. The bottom of the trench H' may slope downwards towards the depressions H , H , which lie opposite the inlet and exhaust ports. To facilitate starting, the whole or a portion of the fuel is temporarily injected into that part of the combustion space lying within the cylinder. Specification 371,025 is referred to.
Abstract:
431,345. Oil engines. RICARDO, H. R., 21, Suffolk Street, Pall Mall, London. Jan. 4, 1934, Nos. 338 and 33685. [Class 7 (iii)] In a compression-ignition engine of the type in which, during the compression stroke, substantially the whole of the air charge is forced through a tangentially-arranged passage G in a heat-insulated plug E into a combustion chamber D which is symmetrical about a plane containing the axis of the passageway and an injector H and which is formed as a solid of revolution about an axis at right angles to this plane, the fuel jet K is directed towards a point on the wall, whose angular spacing from the injector, in the direction in which the air circulates lies between 120‹ and 165‹, and preferably between 120‹ and 150‹. The combustion chamber may be spherical, spheroidal, cylindrical, or barrel-shaped, or may be formed by a double concave or double convex lens, or by two truncated cones whose smaller ends are in open communication. The axis of the passageway may intersect that of the cylinder bore or pass to one side thereof, whilst the plane of symmetry may be inclined to the cylinder axis. The axis of the fuel jet may coincide with the axis of the injector, which may be arranged horizontally, Fig. 4, or vertically so that its axis is tangential to a circle whose radius is between a quarter and a half of the radius of the chamber ; or, as shown, the nozzle may deliver fuel obliquely. In Fig. 4, the jet impinges upon a liner L which is spaced from the walls of the chamber. Specifications 371,025 and 384,340 are referred to.