A piston is a cylindrical plunger that moves within a metal cylinder through the four strokes of the engine cycle: intake, compression, power and exhaust. While their motion is predicated on other engine parts and the mixture of air and fuel, the motion of a piston is central to the functioning of an engine.Know More
The following process describes how a piston works in a standard four-stroke engine. During the intake stroke, the piston is pulled down by the crankshaft. While this is happening, the inlet valve opens and allows fuel and air to mix. For the compression stroke that follows, the inlet valve closes and the piston moves back up the cylinder to compress the mixture of fuel and air. During the power stroke, the spark plug ignites the fuel and air mixture, which pushes the piston back down. For the final phase, the exhaust stroke, the outlet valve opens. Powered by the crankshaft, the piston is pushed back up the cylinder. This forces exhaust gases out the outlet pipe.
Piston rings are essential to the functioning of a piston, as they provide a seal between the piston and the cylinder to facilitate better motion. These parts also prevent leaking between the compression and sump compartments.Learn more about Motion & Mechanics
"Swept volume" is defined as the volume of fluid through which a piston or plunger moves when it makes a stroke in an engine, according to Oxford Dictionaries. The swept volume times the number of cylinders in an engine is known as the displacement, usually measured in liters. Calculating the swept volume is done by multiplying pi times the radius squared times the height of the chamber.Full Answer >
A radial piston pump is a hydraulic pump with rotating pistons that spin symmetrically around a central drive shaft. The pistons are pressed in and out of cylinders surrounding the main shaft rotor as the block rotates, effectively creating a pump function.Full Answer >
A Jake brake works by opening the exhaust valves when the engine's piston reaches top dead center of the compression stroke. The engine uses its momentum and energy to compress the air, and that energy is lost to the atmosphere when the exhaust valves are opened.Full Answer >
Bicycle pumps work through the manipulation of air pressure with a piston inside a cylinder. When the lever is pulled up, the air is drawn into the cylinder. When the lever is pushed down, the air is expelled, usually into the tire, assuming it's attached. The system of one-way valves ensure this happens correctly.Full Answer >