tappet
Học thuậtThân thiện
Definition
Noun: A tappet is a short lever or projection in machinery, especially in an internal combustion engine. It is moved by contact with a cam or other part and transmits this motion to another component, such as a valve, to open and close it.
Usage
The word tappet is a technical term used primarily in mechanical and automotive engineering. It refers to a specific component within an engine's valve train mechanism.
Examples
- The mechanic adjusted the tappet clearance to reduce the engine noise.
- A worn tappet can cause improper valve timing and reduce engine performance.
- The design includes hydraulic tappets that require no manual adjustment.
Advanced Usage
- Tappet clearance (also called valve lash): The small gap between the tappet and the valve stem, which is crucial for proper engine operation.
- Tappet noise: A rhythmic tapping sound from an engine, often indicating that the tappet clearance needs adjustment.
Variants and Related Words
- Valve tappet: A more specific term emphasizing its function in operating a valve.
- Hydraulic tappet: A type of tappet that uses engine oil pressure to automatically maintain zero clearance, eliminating the need for manual adjustment.
Synonyms
- Cam follower: A general term for any component that follows the profile of a cam.
- Valve lifter: A common synonym in automotive contexts, especially in North American English.
Related Terms (Not Synonyms)
- Cam: The rotating egg-shaped lobe that presses against the tappet to create its motion.
- Pushrod: In some engine designs, the rod that sits between the tappet and the rocker arm to transmit motion.
- Rocker arm: A lever that pivots to push the valve open, often activated by a pushrod from the tappet.
Noun
- a lever that is moved in order to tap something else