Patent GB-346832-A (GB)
Title: Improvements in engine governing systems and apparatus
IPC: F02D1/00
Filed: 1930-01-18
Abstract: 346,832. Speed governors. ASSOCIATED ELECTRICAL INDUSTRIES, Ltd., Bush House, Aldwych, London.-(Assignees of Herr, H. T. ; Warwick Hotel, 17th Street, Philadelphia, U.S.A.) Jan. 18, 1930, No. 1813. Convention date, Jan. 19, 1929. [Class 57.] An arrangement for governing an internal-combustion engine in which a pump driven by the engine delivers fluid under pressure to a pressure responsive device which controls the amount of fuel delivered to the cylinders, combined with a regulating device for determining the speed at which the engine shall be governed, which regulating device also sets the timing of the fuel admissions to suit the engine speed. The fuel pump is driven by an eccentric 28, Fig. 7, and the plunger 35 comprises a valve face 39 co-operating with the suction port 37. During a discharge stroke until the suction port is covered by the face 42, the fuel is returned to suction. Upon further advance of the plunger, the fuel is discharged through port 38 until the inclined face 41 uncovers the suction port when the fuel is again returned to suction. The quantity of fuel discharged is controlled by rotating the plunger. The crosshead 32 is provided with teeth 43 gearing with a toothed rack 44. Governing fluid from a pump driven by the engine is delivered through port 108, Fig. 6, to the underside of the piston 101 which is connected to a pilot valve 118 and tension spring 127. Upon increase of governing fluid pressure, the piston 101 is raised and allows pressure fluid contained in the annular space 114 to pass to the top of piston 104 which is connected to a rack 107 gearing with the pinion 47. The pinion 47 also gears with teeth 46 on the rack 45. Thus on an increase of engine speed the rack 107 is moved downwards and through the said gearing rotates the pump plungers to reduce the fuel supply. In order to regulate the speed at which the governor shall function, the delivery pressure of the governing fluid pump is controlled by byepassing a part of the discharge through an orifice 144, Fig. 5, the area of the byepass being controlled by a plug 145 adjusted by hand through the lever 152. When a higher speed of running is required the area of the byepass orifice is increased so that although the governing fluid pump runs at increased speed, the pressure existing in the pressure responsive cylinder 99 is the same as at lower speeds. The fuel pump drive comprises a splined shaft 82 engaging with the driving pinion 64, the other end of the shaft comprising helical teeth 83 engaging similar teeth in a sleeve attached to the fuel pump driving shaft. The rack 146 attached to the plug 145 is pivoted to a lever 181 to which are also attached a pilot valve 162 and a power piston 173. For each setting of the plug 145, the movement of the pilot valve 162 allows pressure fluid to act on the piston 173 and moves the spline shaft 82 relatively to the pinion 64 and thus alters the phase of the fuel pump shaft relatively to the engine shaft. This operation allows a suitable time of fuel admission to be automatically adjusted to suit the engine speed. Means are described whereby the regulation is effected from a remote point. Specification 310,007, [Class 57, Governors &c.], is referred to.