Doxford Jtype
Doxford J-type engines were built in long and short stroke versions in bore sizes of 580, 670 and 760 mm, and with three to nine cylinders delivering up to around 20 000 kW (Table 14.1). The engine is a single-acting two-stroke opposed-piston type with each cylinder having two pistons which move in opposite directions from a central combustion chamber.
The pistons in each cylinder are connected to a three-throw section of the crankshaft, the lower piston being coupled to the centre throw by a single connecting rod, crosshead and piston rod. Each pair of side cranks is connected to the upper piston by two connecting rods, crossheads and side rods. As the pistons move towards each other air is compressed in the cylinder and, shortly before reaching the point of minimum volume between the pistons (inner dead centre), fuel at
Water-cooled upper piston
Fuel injection timing valve
Exhaust gas turbocharger
Water-cooled upper piston
Exhaust gas turbocharger
Fuel injection timing valve
Centre top end bearing
Side top end bearing Centre bottom end bearing
Side bottom end bearing
Figure 14.2 Doxford J-type configuration
Centre top end bearing
Side top end bearing Centre bottom end bearing
Side bottom end bearing
Figure 14.2 Doxford J-type configuration
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