GB775525A - Improvements relating to the drive of ancilliary mechanisms in driving systems having an internal combustion engine as prime mover - Google Patents

Abstract

775,525. Compressors. VOITH GES., J. M. July 22, 1955 [July 28, 1954], No. 21346/55. Class 8(1) [Also in Group XXIX] In an arrangement for operating an air brake compressor in a propulsion unit, having an internal combustion engine 1 as the prime mover, the compressor 6 is driven from the engine 1 through a controllable turbo coupling 5 in such manner that the compressor, when the engine is idling and the coupling is full, rotates at a speed sufficient to deliver at least the minimum permissible quantity of air, and that when idling speed is exceeded the turbo coupling remains in operation until maximum permissible compressor speed is reached, and that with a further increase in engine speed the turbo coupling is controlled to such an extent that the compressor cannot exceed its maximum permissible speed. The turbo coupling 5 is disposed on the impeller shaft of a fluid transmission 4 driven from the engine 1, and drives a main compressor 6 feeding an auxiliary reservoir 7 leading to a main reservoir 9 having a pipe 10 leading to the loads. The coupling is filled from the pump 22 of the hydraulic transmission via a pipe 23, spring-loaded valve 25, and pipe 30. When pressure in reservoir 9 exceeds a predetermined level, air in the duct 44 depresses the valve 25 and interrupts communication between pipes 23 and 30. The coupling has a stationary scoop tube connected by a pipe 32 to a spring loaded valve 26 so that when the valve 25 is in its lowermost position the coupling is emptied rapidly by liquid in pipe 32 passing through apertures in valve 26 to an annular chamber 33, bore 34 and annular chamber 35, thence past the depressed valve 25 into annular groove 36, bore 38 and pipe 40 leading to the oil sump 41. When pressure in pipe .32 exceeds pressure of spring 42, the valve 26 is raised to a greater or lesser extent .and an annular gap controlled by a conical part 43 of the valve is opened to allow some of the liquid in pipe 32 to pass out into bore 38 and pipe 40. An auxiliary compressor 13 is provided to also supply air, through pipe 14, to the main reservoir 9 when the I.C. engine is idling. Power is transmitted from the engine 1 through belting 11 to a clutch 12 which is urged to an open position by a spring 16 acting on a lever 15. The clutch is moved to the closed position by air from the auxiliary reservoir 7 flowing through a pipe 18 to actuate a piston 17, communication between pipe 18 and reservoir 7 being through a valve 19 responding to pressure in the main reservoir 9 so that the pipe is closed when said pressure reaches a certain value but is opened when the pressure falls to a predetermined level. A shut-off valve 20 is coupled with a control lever 21 to close the pipe 18. when the lever is moved out of the idling position.