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

Doxford Type Opposed Piston

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

Table 14.1

Engine type

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