GB419948A - Construction of reciprocating engines - Google Patents

Abstract

419,948. Cylinders, framing, &c. ROBINSON, G. H., 11, Wigan Road, Westhead, Ormskirk, Lancashire. May 18, 1933, No. 14449. [Class 7 (ii).] A cylindrical member in which reciprocating movement takes place in a reciprocating engine, pump, or the like is made by splitting one end of a metal tube, opening the split portions, and connecting one or both portions to the crank-shaft bearing or bearings. In the four - stroke internal - combustion engine shown, each cylinder 1 is made by splitting the end of a tube of steel or an alloy of magnesium or aluminium, opening and flattening the split portions 2, flanging the edges 3, and tucking and welding them into grooves in half-sleeves 4, forming half-bearing housings. Longitudinal stiffening- webs 33 which may extend through the crank case to the half-sleeves, are welded between the cylinders, which are preferably chromium-plated to a thickness of <1>/100 in. In a multicrank engine in which there is no bearing between each crank pin, some of the cylinders have no split portions and are retained by the webs 33 and by welding to the upper half of the crank case. The lower half of the crank case is formed by a pan 53 which is bolted on to the upper half through welded-on bosses 54 joined by stiffening-webs 55. The top half 6 of the crank case is welded to the cylinders and comprises two plates 7, 8 connected by longitudinal webs 9 and transverse webs 10, which are welded to the inner plate and provided with tongues 11 passing through slots in the outer plate 8, so that they can be welded to the latter plate from the outside. To stiffen the cylinders laterally, one transverse web 10 on each side of each cylinder is extended upwards as at 10a, and two of these are extended laterally to form a seating 12 for a dynamo or other auxiliary, and further stiffening-webs 59 are welded between the plate 7 and the edges of the split portion 2. End plates 13, 14, formed of steel pressings or built up by welding steel plates and stiffening- ribs, are welded to the upper half of the crank case, the plate 14 being recessed and forming with a plate 27 a casing 17 to accommodate gear for driving a cam shaft 18. An apertured plate 34 is welded to the top of the cylinders to receive the studs 45 holding down the cylinder head, which is welded up from pressings and plates, and a sheet 35 is welded to the plate 34 and to the outer plate 8 of the crank case to form a water jacket. A casing which holds the valve gear is formed between a plate 41 closing the top of the water space in the head and a sheet-metal cover 43 having welded stiffening-ribs 44. After welding has been completed the structures are annealed to relieve stresses.