An internal combustion engine (1) has hydraulically driven exhaust valves (13) and fuel pumps (18). The hydraulic drives are controlled by means of a computer (16) and electrically activated positioning means (64) setting a spool in a spool valve. If the electronic control of the engine fails, the s
An internal combustion engine (1) has hydraulically driven exhaust valves (13) and fuel pumps (18). The hydraulic drives are controlled by means of a computer (16) and electrically activated positioning means (64) setting a spool in a spool valve. If the electronic control of the engine fails, the spool movement may be controlled by a first piston (41) on which the pressure in a hydraulic hose or conduit (48) acts, said conduit extending to a second piston (44) which may follow a cam (26) on a rotating camshaft. The hydraulically driven cylinder members (13, 14, 18) associated with each of the engine cylinders are mounted at the pertaining cylinder, whereas the camshaft (23) independently of the positioning of the cylinder members is disposed at an appropriate shaft drive, such as the crankshaft (11). The cam shaft has a very short length and small mass and may for instance be disposed at one end of the engine.
대표청구항▼
A large two-stroke internal combustion engine (1), in particular a main engine of a ship, having a hydraulically driven cylinder member, such as a fuel pump (18) or an exhaust valve (13), in which the hydraulic drive of the member comprises a driving piston (70) journalled in a hydraulic cylinder (6
A large two-stroke internal combustion engine (1), in particular a main engine of a ship, having a hydraulically driven cylinder member, such as a fuel pump (18) or an exhaust valve (13), in which the hydraulic drive of the member comprises a driving piston (70) journalled in a hydraulic cylinder (69) which, through a flow passage 67, communicates with a spool valve, the spool of which (74) may occupy a position where the flow passage (67) communicates with a high-pressure source (65) for hydraulic oil, and another position where the flow passage communicates with a low-pressure port (66), and where, during normal engine operation, the spool is positionable by means of an electrically activated positioning means (64) receiving control signals from an engine controlling computer (16), and where, in case of failure of the normal engine control, the spool is alternatively positionable by means of a camshaft (23) rotating synchronously with the crankshaft (11) of the engine, characterized in that the spool (74) is associated with a first piston (41) on which the pressure in a hydraulic conduit (48) acts, said conduit extending to a second piston (44) which may follow a cam (26) on the rotating camshaft, and that the hydraulically driven cylinder members (14, 13, 18) associated with each of the engine cylinders are mounted at the pertaining cylinder, whereas the camshaft (23) independently of the positioning of the cylinder members is disposed at an appropriate shaft drive, such as the crankshaft (11).
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