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The name 'trunk piston' derives from the 'trunk engine', an early design of marine steam engine. To make these more compact, they avoided the steam engine's usual piston rod with separate crosshead and were instead the first engine design to place the gudgeon pin directly within the piston.
Single-acting pistons of a typical modern diesel car engine. In contrast to steam engines, nearly all internal combustion engines have used single-acting cylinders. Their pistons are usually trunk pistons, where the gudgeon pin joint of the connecting rod is within the piston itself. This avoids the crosshead, piston rod and its sealing gland ...
The trunk engine, another type of direct-acting engine, was originally developed as a means of reducing an engine's height while retaining a long stroke. (A long stroke was considered important at this time because it reduced the strain on components.) A trunk engine locates the connecting rod within a large-diameter hollow piston. This "trunk ...
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The trunk engine was largely replaced by the double piston-rod engine. [ 2 ] [ 8 ] This was a return connecting rod engine, with the crankshaft between the crosshead and cylinder. Four piston rods were used to pass around the crankshaft, both above and below, and also to each side of the crank, as the crank throw was wider than the vertical ...
A crosshead as part of a reciprocating piston and slider-crank linkage mechanism. Cylindrical trunk guide Hudswell Clarke Nunlow; crosshead and two slide bars. In mechanical engineering, a crosshead [1] is a mechanical joint used as part of the slider-crank linkages of long stroke reciprocating engines (either internal combustion or steam) and reciprocating compressors [2] to eliminate ...