GB190014969A - - Google Patents

Abstract

14,969. Scott, A. F. Aug. 21. pistons; stuffing - boxes etc.; dash-pots.- Relates to the lubrication of the bearings of engines and machinery and to the utilization of the pressure at the bearing. Fig. 2 shows the application of the invention to the connecting-rod and piston of a single - acting engine. A passage B having branches B<2> runs from the crank-pin bearing A to the gudgeon-pin bearing F, which is provided with grooves C for receiving the oil forced by pressure from the bearing A. Grooves or flats, either straight or inclined, are formed in the gudgeon pin, and serve to transfer the oil from the grooves C to grooves or flats nearer the centre of bearing surface where the pressure is greater. At the crank-pin end, grooves or flats are formed in the pin K and corresponding grooves in the bearing. The grooves are cut in a curved form along lines of "uniform film-pressure." The oil may be forced from the crank-pin bearing through passages to a groove C<2> in the piston, or crosshead, or to the back of or between the piston rings ; or a ring may be removed and the groove supplied with oil, the oil in these cases serving to lubricate the piston and to form a joint to prevent leakage of the motive fluid past the piston. The oil may be taken from a main bearing A, Fig. 10, to a fixed part of an engine such as a stuffing-box, Fig. 11, where it passes by a hole B' to the back of the spring ring Q<4> or to a groove between the rings, serving to prevent leakage as well as for lubricating purposes. A ball V may be arranged to form a non-return valve. Figs. 10 and 12 show the invention arranged in connection with a dash-pot. Oil is forced from the bearing A through a pipe B<9> and valve R to the cylinder of the dash-pot, any leakage past the rod T<2> being returned to the bearing by a pipe B<10>. The motion of the piston may be regulated by turning the cock R. An exhaust port is arranged in connection with the cock R for the purpose of enabling the piston to be moved by means of the oil pressure. In a similar manner to the above, oil may be forced through a piston-rod to the rings, and from an eccentric strap to the valve or valve rings.