Patent GB-1085336-A (GB)
Title: Improvements in or relating to manoeuvring mechanisms for reversible internal combustion engines
IPC: F02D29/00
Filed: 1966-05-31
Abstract: 1,085,336. Starting; reversing. GOTAVERKEN A. B. May 31, 1966 [June 9, 1965], No. 24199/66. Heading F1K. A manoeuvring mechanism for internalcombustion engines adapted to be started and reversed by means of pressure air, comprises a manoeuvring shaft 1 a disc 2 fixed thereon and adapted to co-operate with locking means for the fuel supply and with a catching member 4 in the reversing mechanism, the catching member being designed to be brought into three positions one for each direction of rotation and one intermediate locking position during reversing operations and co-operating with means governing the supply of pressure air for reversing and starting the engine and a member operated by the initial turning of the engine to release the locking means after a certain delay. From the starting air container 24 air of comparatively high-pressure is conducted to a master valve 25 as well as through a filter 26a to a reducing valve 26b. From this air at reduced pressure will be led to a selector valve 28 by means of which the manner of operation - remote control or manual operation - is determined. From the filter 26a reduced pressure air is also led by way of a conduit 27 to a pilot valve 29 for operation of a starting slide 30. If remote control is chosen air from the valve 28 is conducted to the small diameter plunger 14b of the differential piston 14 and also to a valve 31. Air is also led by way of a conduit 32 to two three-way valves 33 and 34 which are intended to determine operation of the engine "ahead" or "astern" respectively. Air furthermore reaches a pressure regulator 35 influencing the fuel supply. The valves 33 and 34 as well as the pressure regulator 35 are operated by means of an intermediate member which is worked by means of a manoeuvring handle. If for instance the valve 33 for "ahead" is operated air is conducted by way of a pipe 36 to a shuttle valve 37 which supplies air to a member 38 sensitive to the initial movements of the engine. The member 38 contains a piston 39 which when subjected to air-pressure depresses a contact member 40 to co-operate with a rotating part 41 in the engine. As soon as the engine and consequently also the part 41 begins to rotate, the contact member 40 will follow the direction of rotation whereby it will operate one of the valves 42, 43. From the conduit 36 air is further distributed to the valve 42, and to one end of the reversing cylinder 11. If the engine has not begun to rotate the valve 42 remains closed. If the piston 10 is already in a position for "ahead" no movement of the piston will occur and air may thus pass through the outlet at the middle portion of the cylinder 11. From this outlet it is conducted to a second shuttle valve 44 which is actuated from a cam 45 arranged on the manoeuvring shaft 1 to de-aerate the parts of the system when the manoeuvre is completed. In the indicated position of the shuttle air may pass to the pilot valve 29 which is opened in such a manner that air from the conduit 27 may open the starting slide 30. This means that high-pressure air reaches the starting valve 46. Simultaneously air is led by way of a conduit 57 to a cylinder 58 which operates a locking member in the reversing mechanism 22 in such a manner that cams (not shown) on a shaft 59 will be brought into a suitable position for the selected direction of rotation. From a pipe 47 between the starting slide 30 and the starting valve 46 a pipe 48 leads to a valve 49 which will be operated by the cams of the starting air distributer in positions suitable for the direction of rotation. As soon as the crank-shaft of the engine starts to rotate the contact member 40 is displaced in the corresponding direction and opens one of the valves 42, 43 in such a manner that air is led to a shuttle valve 50 and from there to a reducing valve 51 which may be adjusted in such a manner that the valve 31 will be opened after a certain delay. The valve 31 is connected to the member 3. When air is supplied thereto the piston 14 will be displaced to the right whereby the recess 15a will correspond to the disc 2 to make this free. The fuel supply can now begin. The pressure regulator 35 operated by the manoeuvring handle permits a pressure impulse to pass by way of a pipe 52 to a cylinder 53. This impulse is proportional to the position of the manoeuvring lever. The cylinder 53 is mounted upon and co-operates with the hydraulic speed governor 20 for operating the link 18.