Which combination of parts is directly involved in the conversion of reciprocating motion to rotary motion in a diesel engine?
Piston, connecting rod, crankshaft
The principle here is that combustion produces a straight-line push on the piston, which the engine must turn into rotation to drive the wheels.
The piston moves up and down in the cylinder in a straight reciprocating motion under the force of the expanding gases.
The connecting rod links the piston to the crankpin, transmitting the straight-line thrust to the offset throw of the crankshaft.
The crankshaft's offset throw converts that back-and-forth force into continuous rotary motion, so the piston, connecting rod and crankshaft together perform the conversion.
The cylinder liner, rocker arm and injector deal with guiding the piston and controlling fuel and valves, not with turning reciprocation into rotation.
The valve, cylinder head and camshaft, and likewise the injector, camshaft and flywheel, manage gas exchange, timing or energy storage rather than the motion conversion itself.
Hence, the answer is Piston, connecting rod, crankshaft.
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