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Tappet
A tappet or valve lifter is a valve train component which converts rotational motion into linear motion in activating a valve. It is most commonly found in internal combustion engines, where it converts the rotational motion of the camshaft into linear motion of intake and exhaust valves, either directly or indirectly.
An earlier use of the term was for part of the valve gear in beam engines beginning in 1715. The term is also used for components in pneumatic cylinders and weaving loom.
The first recorded use of the term tappet is as part of the valve gear in the 1715 Newcomen engine, an early form of steam engine. Early versions of the Newcomen engines from 1712 had manually operated valves, but by 1715 this repetitive task had been automated through the use of tappets. The beam of the engine had a vertical 'plug rod' hung from it, alongside the cylinder. Adjustable blocks or 'tappets' were attached to this rod and as the beam moved up and down, the tappets pressed against long levers or 'horns' attached to the engine's valves, working the cycle of steam and injection water valves to operate the engine.
This operation by tappets on a plug rod continued into the early twentieth century with the Cornish engine.
From the 19th century onwards, most steam engines used slide valves or piston valves, which do not require the use of tappets.
In an internal combustion engine, a tappet (also called a 'valve lifter' or 'cam follower') is the component which converts the rotation of the camshaft into vertical motion to open and close an intake or exhaust valve.
The principal types of tappets used in automotive engines are solid, hydraulic, and roller.
To reduce wear from the rotating camshaft, tappets are usually circular and allowed, or even encouraged, to rotate in place. This minimizes wear caused by the camshaft contacting the same point on the base of the tappet each valve cycle, which can result in grooving. However, in some relatively small engines with many cylinders (such as the Daimler '250' V8 engine), the tappets were small and non-rotating.[citation needed]
Tappet
A tappet or valve lifter is a valve train component which converts rotational motion into linear motion in activating a valve. It is most commonly found in internal combustion engines, where it converts the rotational motion of the camshaft into linear motion of intake and exhaust valves, either directly or indirectly.
An earlier use of the term was for part of the valve gear in beam engines beginning in 1715. The term is also used for components in pneumatic cylinders and weaving loom.
The first recorded use of the term tappet is as part of the valve gear in the 1715 Newcomen engine, an early form of steam engine. Early versions of the Newcomen engines from 1712 had manually operated valves, but by 1715 this repetitive task had been automated through the use of tappets. The beam of the engine had a vertical 'plug rod' hung from it, alongside the cylinder. Adjustable blocks or 'tappets' were attached to this rod and as the beam moved up and down, the tappets pressed against long levers or 'horns' attached to the engine's valves, working the cycle of steam and injection water valves to operate the engine.
This operation by tappets on a plug rod continued into the early twentieth century with the Cornish engine.
From the 19th century onwards, most steam engines used slide valves or piston valves, which do not require the use of tappets.
In an internal combustion engine, a tappet (also called a 'valve lifter' or 'cam follower') is the component which converts the rotation of the camshaft into vertical motion to open and close an intake or exhaust valve.
The principal types of tappets used in automotive engines are solid, hydraulic, and roller.
To reduce wear from the rotating camshaft, tappets are usually circular and allowed, or even encouraged, to rotate in place. This minimizes wear caused by the camshaft contacting the same point on the base of the tappet each valve cycle, which can result in grooving. However, in some relatively small engines with many cylinders (such as the Daimler '250' V8 engine), the tappets were small and non-rotating.[citation needed]
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