Patent GB-447284-A (GB)
Title: Improvements in or relating to the starting of oil engines
IPC: F01L13/00
Filed: 1934-11-19
Abstract: 447,284. Starting. BRUSH ELECTRICAL ENGINEERING CO., Ltd., and SENIOR, H. V., Falcon Works, Loughborough, Leicestershire. Nov. 19, 1934, No. 33214. [Class 7 (v)] In oil engines of the compression - ignition or the hot-bulb type, means is provided for preventing starting of the engine until the fuel injection has been retarded and reduced. As shown, a " starting lever " 10 controls the supply of starting air, the release of compression, and the quantity of fuel injected, and a " fuel lever " 11 controls the timing of the fuel injection. A lateral projection 12 on the fuel lever 11 projects behind the starting lever 10, so that movement of the latter to its starting position F moves the lever 11 to the position C in which the fuel injection is fully retarded. The starting lever 10 is mounted on a shaft 13 carrying a cam 14 for controlling the compressionrelief means and the supply of starting air, and a cam 15 controlling the quantity of fuel injected. The cam 15 rocks a governor shaft 20 and retracts a plunger 21 from the casing of the fuel injection pump to decrease the quantity of fuel injected; in the " stop " position E of the lever 10, the fuel injection is entirely cut off. The fuel lever 11 is freely mounted on the shaft 13 and is connected by a link 25 to arms on a shaft 26 carrying an eccentric on which is mounted the lever 28 of the fuel-pump plunger 36, which is actuated by a cam 30 on a shaft 31 driven by skew or other gearing 32, 33 from the engine cam shaft 35. Movement of the lever 11 thus advances or retards the operative stroke of the fuel pump. The engine cam shaft 35 carries air-inlet and exhaust cams 37, 38, a half-compression cam 39, and a starting-air cam 40. The halfcompression cam 39 is carried by a sleeve 41 splined on the shaft 35 and biassed towards the exhaust cam 38 by a spring 43. When the sleeve 41 is slid along the shaft 35, the half-compression cam 39 acts upon a roller 49 on the exhaust-valve lever 47. The starting- air cam 40 acts on the stem of a starting-air supply valve 51 and is formed on a sleeve 52 splined on the shaft 35 and normally maintained in inoperative position by a spring 53. Axial movement of the sleeves 41, 52 to bring the cams 39, 40 into starting position is effected by arms 55, 60 on spindles 54, 59 actuated by the cam 14 on the shaft 13 through levers 65, 66 and links 63, 64, 57. The cam 14 has faces 14a, 14b, so formed that movement of the starting lever 10 to the " stop position E brings the half-compression cam 39 into operative position, and in the " starting " position F both cams 39, 40 are operative. To effect starting, a valve on the starting- air reservoir is opened, and the fuel lever 11 is moved to the position C in which injection is retarded. The lever 10 is moved from the " stop " position E to the starting position F in which the starting-air and half-compression cams are operative and the engine is driven by the starting air. The lever 10 is then moved to a position D in which the starting-air and half-compression cams are inoperative and a reduced quantity of fuel is supplied, the quantity being gradually increased to normal by movement to the position A, when the fuel lever 11 can be moved to a position B in which the injection is fully advanced. The engine speed is then controlled by a governor 71 acting on the rock shaft 20.