The term “trunk-piston type” refers to a specific configuration of piston assembly in an engine, where the piston is directly connected to the upper end of the connecting rod. This direct connection means that the piston moves up and down within the cylinder bore, directly driving the connecting rod and ultimately the crankshaft.
In contrast, an “indirect connection” is referred to as a “crosshead-piston type.” In this configuration, the piston is connected to a crosshead, and the connecting rod is connected to the crosshead rather than directly to the piston. This design is often used in large engines, such as those found in marine applications or certain industrial machinery, to accommodate the forces and stresses involved.
Each configuration has its advantages and disadvantages, and the choice between trunk-piston and crosshead-piston types depends on factors such as engine size, application, operating conditions, and desired performance characteristics.
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