To keep the rings from rotating on 2 stroke engines. You will not see this on 4 stroke engines.
The piston rings create a seal between the piston and the cylinder wall.
A piston seal is a gasket designed to keep fluid from leaking around the piston. Piston seals are commonly used in brake calipers.
It is a spring metal sleeve that goes over a piston to compress the rings so that the piston can be install in the motor. It tightens down on the piston, forcing the rings into the grooves in the piston then you tap it into the cylinder.
On the outside of a piston near its top are two or more grooves that hold steel piston rings. The piston rings are used to form a seal between the piston and the cylinder. The material between the ring grooves is often called the ring lands.
It compresses the air in a engine or compressor.
it connects the piston to the crankshaft
The purpose of a piston ring expander is to make it easier remove and install piston rings. Because of the low torque they use, they help to prevent damage to the piston rings.
To compress gases in order to create a controlled expansion of gases thus allowing the piston to descend
The gasoline is avoided to go into the oil by few piston rings placed on the piston of the engine. Actually, the piston rings are made for this purpose only.
It is used to compress the oxygen and fuel and cause it to to combust
cushioning used to reduce the piston velocity ,the piston movement will go for slow motion so that purpose using a cushioning.
to produce magnetic field to move the piston of the doorbell
I believe a gudgeon pin is what the British call a connecting rod pin (or wrist pin or piston pin) in a reciprocating assembly, (piston, connecting rod, crank ) It connects the piston head to the connecting rod.
The crankshaft converts the linear motion of the piston into rotation of the crankshaft.
Dummy piston is provided to oppose the axial thrust generated (in the direction of steam) due to incoming steam.
The piston in a petrol engine moves up and down within a cylinder, converting the pressure generated by burning fuel into mechanical energy. As the piston moves, it transfers this energy to the crankshaft, which in turn drives the vehicle's wheels.