GB130673A - Improvements in or relating to the Starting, Stopping and Reversing of Internal Combustion Engines. - Google Patents

Abstract

130,673. White & Co., J. S., Forster, A., and Brown, J. H. March 9, 1918. Starting; stopping; reversing.-In a compressed-air starting and stopping system for multioylinder Diesel engines, a single lever G' actuates a starting- valve N, Fig. 3, a. valve P for stopping, and, preferably, also a valve 0 for starting in the reverse direction. The valves N, O control the supply of compressed air to the cylinder starting-valves C and also to the fuel-injection valves E, and the valve P controls the supply of compressed air for actuating compression-relief valves F. In the arrangement shown in Figs. 1 and 3, each of the valves N, O controls the supply of compressed air from a reservoir k and pipe k<2> to one or other of the pipe systems II, H<1> leading to valves D, D<1> respectively on each cylinder. These valves D, D' control the actuation of the starting-valves C, which are connected to the air reservoir k through pipes c, k<1> and a valve K actuated by compressed air supplied from one or other of the valves N, O through pipes H<4>, H<6>. The valves D, D' of half the cylinders are connected to the corresponding pipe systems H, H<1> through time valves B, B<1>, which close after a definite time has elapsed. The fuelinjection valves E are supplied from an air reservoir j through pipes j<1>, e and a valve. J actuated from the valves N, 0, P through pipe connexions H<3>, H<5>, j<2>. In a modified arrangement, the pipe systems H, H' and the valves D, D' are omitted, the supply of compressed air to the valve K from one or other of the valves N, 0 being controlled by a piston valve actuated pneumatically or connected to the mechanism which controls the engine valve-gear for reversing; and a single time valve B in the piping c controls the compressed. air supply to three of the cylinders. The valves N, 0, P, Fig. 3, are lift valves actuated by projections on the lever G<1>. The valves N, 0 have hollow stems N<3> allowing the escape of compressed air from the piping H when the valves are seated; the lower ends are closed, when the valves are lifted, by valves N<6> connected to the valve stems N<3> by a pin engaging a slot in the valve. The time valve B, Fig. 5, has a valve Q and a piston Q<2> lifted by pressure; the valve Q closes again when sufficient compressed air has escaped by a fine orifice Q<8> into the chambers Q<6>, Q<5>. The orifice Q<8> may be replaced by a number of spaced superposed disks with fine holes out of line; or the chamber Q<6> may be above the valve Q, which is in one piece with the piston Q<2> and has a central escape passage. The valve J, for controlling the fuel-injection air supply through the pipes j<1>, e, comprises a lift valve R, Fig. 9, controlled by compressed air admitted by either of the pipes H<3>, H<5> and acting on a piston R<7>. The valve R has a hollow stem R' with apertures R<3> and rests on an enlargement R<10> of a tubular valve R<5>, which rests on a seating in the piston R' and has a perforation R<12>; the outward movement of the valve R<5> is limited by a pin R' This arrangement allows the equalization of pressure between the chambers R<4>, R<8>. A pipe j<2> leads from the chamber R<8> to the relief valve P, Fig. 3, so that the actuation of the valve P closes the valve R and stops the engine; the pressure in the pipe c can then escape through the valve R<5> and the piston R'. The valve stem R<1> and the valve R<5> may be of one diameter and superposed, the valve having a tubular passage extending through the piston into a valve seating, and the piston being a loose fit and rendered air-tight by a flexible diaphragm. The valve K controlling the starting air is a lift valve connected to a piston actuated by compressed air from either of the pipes H<4>, H<6>, and the compression-relief valves F are similar piston-controlled lift valves. The starting-valves C, Fig. 12, each comprise a lift valve T connected to a piston T<4>, which is actuated by compressed air admitted by the pipe h or h<1> to one or other of the piston valves D, D<1>. The valve D or D' is thus brought into engagement with the cam-actuated levers U<6> and oscillated. The Provisional Specification describes a modification of the valves J in which the piston, made air-tight by a fiexible diaphragm; has a skirt portion controlling an external pipe for effecting communication between the chambers R<4>, R<8>, Fig. 9.