Patent GB-754615-A (GB)
Title: Improvements in or relating to reversing mechanisms for multiple-cylinder internal-combustion engines
Inventor: NAESHOLM ALFRED
IPC: F01L13/02
Filed: 1954-08-27
Abstract: 754.615. Reversing. AKTIEBOLAGET GOTAVERKEN. Aug. 27, 1954, No. 24977/54. Class 7(5) In a reversing mechanism for multicylinder I.C. engines which have two cams 2, 3, Fig. 1, associated with each cylinder the cams being attached to a rotating shaft 1 and adapted to operate the engine inlet and/or exhaust valves, or fuel injection means, not shown. and in which the actuating gear between the cams 2, 3 and the valves or other means at each cylinder contains a roller 8 slidable on a tappet spindle 7 parallel to the camshaft, so that during reversing the roller 8 is shifted between two positions in which it coacts with either one of the cams 2, 3. there is provided a distributing valve 14 on the camshaft for transmitting impulses to pistons 10 each operating a roller 8 in. such a manner that the latter is moved from one position to the other only when it is not acted upon by a cam. The camshaft 1 is provided with two pairs of cams 2, 3 and 4, 5, one pair for each enginecylinder, one cam of each pair being used for one direction of engine rotation and the other cams for the reversing rotation. Each pair of cams is associated with a tappet 6 having a forked end carrying the spindle 7 on which the roller 8 is slidable to co-operate with one or the other of the cams. The pistons 10 are each supplied with lubricating oil or starting oil through the valve 14 and a two position reversing valve operated by a handle 26. In a modification, the rollers are shifted by members 13, Fig. 4, which receive timed impulses from a shaft 39, Fig. 5, driven by the engine, the shaft carrying two cam discs 40, 41 for each engine cylin- 'der. The cam discs are arranged to contact arms 43, 44, Fig. 4, respectively, when the corresponding cam is out of contact with its roller; the arms 43, 44 are mounted upon a shaft 42 so that only one arm is in the path of its associated cam disc at any time, the shaft being turned to make the other disc operative when it is desired to reverse the engine by sliding a rod 45, Fig. 5, in one direction or the other. The rod extends the whole length of the engine and has springs 46, 47, one on each side of each lever connecting the rod to the shaft 42 to enable the rod stroke to be completed since turning of the shafts 42 will take place sequentially under the action of the springs when upon rotation of the shaft 39 the smallest radius of each cam disc coincides with the associated arm and enables the latter to move from the side of the cam disc into the path of its periphery. When the highest part of the cam disc contacts the arm, the latter is moved downwards and transmits the impulse to the member 13 through bell-crank levers 51, 53 and 55 and links 50, 52 and 54. The transmission system incorporates apparatus 57-63 which locks the mechanism until new impulses are given, moves the arms out of reach of the cam discs when reversing has been effected and accelerates the last part of the movement of the system each time reversal is effected. The reversing valve or the rod 45 may 'be operated manually or connected to the engine manoeuvring mechanism or starting oil distributer.