Machine Parts

The overhead camshaft type valve actuating mechanism is generally preferred over the side camshaft type mainly of it’s because of it’s greater rigidity since the camshaft direct the operates the valve instead of operating through push rod and rocker arm. Due to this the valve is open and closely quicker with decreased vibrations and undesirable oscillation. This means increase of high lift, high acceleration cam profile, the   valve operation in case of overhead camshaft is much more precise and smooth than in case of the side camshaft valve system.   However in case of overhead camshaft with inverted bucker follower, the valve lift is equal to the cam lift, whereas in case of the side camshaft, the cam size has to be relatively larger for the same valve lift, which leads to higher cam to follower velocities and relatives rubbing velocities resulting inside thrust reaction caused by the cam action.

For a fixed   distance contact generally more used helical spring such as contact with cam and contact with tappet. Spring help to balance pressure and also give same pressure all space of valve. Generally it is ground flat shape which is subjects to compressive loads. For removing bending tendency diametrically opposed coils end are set up.  The retention the spring is simple of the design which is set up. In this types of helical spring contain ring split which contains two halves and inner surface contain internal projection, it’s help to set up properly to fit. And Outer surface is tapper which can help to do good job. The spring supported from split ring. Valve spring mainly use for heavy service. The valve spring generally made from high steel wire where material is hard drawn carbon and chrome and vanadium steel mainly use. For fatigue resistant valve spring are often shot penned.

Marine steam engine which is more used in ship for creating power for supply to mechanical energy in a ship. Reciprocating steam engine is more used in ship.  After world war II people made steam engine which create a large amount of power. But day by day change of technology now more used in ship diesel engines and steam turbines. In 1712 Thomas Newcomen first commercially developed Marine Steam Engine who was a Scottish engineer. After one hundred year in 18 th century steam engine more developed and walk on way of water which is 1 st steamboat ride in world successfully. Following this 1807 Robert Fulton successfully developed a watt engine. In 19 th century Marine steam engine is more developed by scientist. And Marine Steam Engine divided by two method of manufacture number one is Cylinder technology and number two is connection mechanism. Some example of connection mechanism is crosshead, side lever, vibrating lever, vertical, oscillating, back acting, trunk, di

                               Following a axis in a circle when a particles move in a disk or shaft, a vibration is create, these types of vibrations is called Torsional vibrations. In this process shear stress of torsional is induced and tortile shaft or untortile shaft is another way.   A small particle or body is motion with a shaft or disk in parallel and create vibration by Self exciting it is called Longitudinal Vibrations.   In this process shaft is expanded and diminished, Stress is induced as curtail and tensile. By receiving external force   a body or a metal which is resilient in shaft or spring or beam, after applying to external force it is exempt and create a vibratory motion. There are three types of vibration motion one is force and another is free, but also damped vibration is also include.   When a vibration is occurred   in a cycle and amplitude is up of reduction, this vibration is called Damped vibrations.   Natural or free vibration is defined as