Valve rocker is spelled with the IPA transcription /ˈvælv ˈrɑkər/. The "v" in "valve" is pronounced as [v], which is a voiced dental fricative. The "a" in "rocker" is pronounced as [ɑ], which is an open back vowel. The letter "o" is pronounced as [ɑ] as well. The "ck" in "rocker" is pronounced as [k], which is an unvoiced velar stop. The stress in this word falls on the first syllable, as indicated by the apostrophe before the "v" in "valve".
A valve rocker is a mechanical component found in internal combustion engines that helps in the operation of the engine's valves. It usually consists of a lever that pivots on a fulcrum, with one end designed to make contact with the camshaft or pushrod, and the other end connecting to the valve stem.
The primary function of a valve rocker is to transmit motion from the camshaft or pushrod to the valve. As the camshaft rotates or the pushrod moves, the valve rocker transfers this motion to open or close the valve. This process is vital for the proper functioning of the engine as it allows the intake and exhaust valves to open and close at the appropriate times. The valve rocker plays a crucial role in controlling the timing and duration of the valve's opening and closing events, thus controlling the flow of air/fuel mixture into the combustion chamber and the exhaust gases out of it.
Valve rockers are commonly found in overhead valve (OHV) or overhead camshaft (OHC) engines. The design and construction of valve rockers may vary depending on the engine's configuration and manufacturer's specifications.
In summary, a valve rocker is a mechanical device that transfers motion from the camshaft or pushrod to the valve, allowing for the precise timing and control of valve opening and closing events.
The word "valve rocker" is composed of two separate terms: "valve" and "rocker".
The term "valve" originates from the Latin word "valva", which means "door leaf" or "covering". It first referred to a device that allowed or prevented the flow of fluid or gas through a passage or tube. Over time, it came to specifically describe the mechanical device used in engines to control the flow of air or fuel.
The term "rocker" comes from the Old English word "roccian", meaning "to sway or roll". It was originally used to describe a cradle-like rocking or swaying motion. In the context of engines, a "rocker" refers to the mechanical arm that rocks or pivots on a fulcrum to open and close engine valves.