Cylinder

-
Cylinder - The portion of the engine in which the power is developed is called the cylinder provides a combustion chamber where the burning and expansion of gases take place, and it houses the piston and the connecting rod. 
Cylinder head of an air cooled engine is generally made of aluminum alloy because aluminum alloy is a good conductor of heat and its light weight reduces the overall engine weight.
Cylinder heads are forged or die-cast for greater strength. The inner shape of a cylinder head is generally semispherical. The semispherical shape is stronger than conventionalist design and aids in a more rapid and thorough scavenging of the exhaust gases
Cylinder used in the air cooled engine is the overhead valve type.  
Each cylinder is an assembly of two major parts: 

  1.  cylinder head and 
  2. cylinder barrel. 

At assembly, the cylinder head is expanded by heating and then screwed down on the cylinder barrel, which has been chilled. When the head cools and contracts and the barrel warms up and expands, a gastight joint results. 
The majority of the cylinders used are constructed in this manner using an aluminum head and a steel barrel.

Comments

Post a Comment

Popular posts from this blog

Cylinder Barrel

-
Image
Cylinder barrel   are  made of light and high-strength material and  have the proper characteristics for  operating under high temperatures. It must be made of a  good bearing material and have high tensile strength.  Cylinder barrel is made of a steel alloy forging with the inner  surface hardened to resist wear of the piston and the piston  rings which bear against it.  Hardening is usually done  by exposing the steel to ammonia or cyanide gas while the steel is very hot. The steel soaks up nitrogen from the gas,which forms iron nitrides on the exposed surface. As a result  of this process, the metal is said to be nitrided.  Nitriding   only penetrates into the barrel surface a few thousands of an  inch. As the cylinder barrels wear due to use, they can be  repaired by chroming. This is a process that plates chromium  on the surface of the cylinder barrel and brings it back to new  standard dimensions.  Chromium-plated cylinders should use  cast iron rings. Honing the cyli
Read more

Cylinder Head

-
Cylinder head   provides a place for  combustion of the fuel/air mixture and to give the cylinder  more heat conductivity for adequate cooling. The fuel/air  mixture is ignited by the spark in the combustion chamber  and commences burning as the piston travels toward TDC  on the compression stroke. The  ignited charge is rapidly expanding at this time, and pressure  is increasing so that, as the piston travels through the TDC  position, it is driven downward on the power stroke. The intake and exhaust valve ports are located in the cylinder  head along with the spark plugs and the intake and exhaust  valve actuating mechanisms. After the cylinder head is cast, the spark plug bushings, valve  guides, rocker arm bushings, and valve seats are installed in  the cylinder head. Spark plug openings may be fitted with bronze or steel bushings that are shrunk and screwed into  the openings.                  Stainless steel Heli-Coil spark plug inserts   are used in many engines currently m
Read more