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As to the construction of Diesel engines we distinguish two main types: the trunk engine and the crosshead engine. In a trunk engine the piston pin and crank pin are directly connected to each other by the connecting rod. Trunk engines are of compact build and are mostly medium speed- or highspeed engines. Compared to the crosshead engines they do require more maintenance. The crosshead engine is taller because of the crosshead and piston rod, which require more space. These engines are mainly used in large vessels. The crosshead serves as a hinging connection between piston rod and connecting rod.
Crosshead guide shoes and crosshead guides absorb the forces onto the crosshead when the piston goes down.
With a direct-acting (or direct-reversible) crosshead engine maintenance costs can be kept to a minimum because there is no reversing gear. The crosshead engine is reputed to be very reliable, but is considered to be more costly compared to the trunk engine.
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| Introduction | | | Part V. The working of a two-stroke engine |