What is the composition of the valve train?
4 Answers
1. The valve group mainly consists of valves, (valve guides, valve oil seals), valve springs, valve spring seats, valve locks, etc. 2. The valve drive group mainly consists of camshafts, valve lifters, valve rocker arms, rocker arm shafts, camshaft timing gears, valve tappets, valve push rods, etc. The engine valve train (internal combustion engine valve train) operates according to the working cycle and ignition sequence requirements of each cylinder in the engine, timing the opening and closing of the intake and exhaust valves of each cylinder to allow fresh combustible mixture.
When it comes to the valve train, it's like the engine's respiratory system, primarily ensuring smooth intake and exhaust. The core components include the camshaft, which acts like the heart, controlling the opening and closing rhythm through rotation; the valves, divided into intake and exhaust valves, function like a person's nose and mouth, regulating the flow of air in and out; the rocker arms connect the camshaft and valves, serving as transmission levers; the springs help the valves return quickly; sometimes there are pushrods or lifters for power transmission. Overall, if these components work well together, the engine will be more powerful and fuel-efficient. During maintenance, attention should be paid to cleaning and lubrication to avoid carbon buildup blocking the valves or spring aging. I've seen a friend's car experience weak acceleration due to stuck valves, so timely inspection and replacement are necessary.
My experience in car repair tells me that the key to the composition of the valve train lies in precision. The camshaft drives the entire system, moving via a timing belt or chain; valves typically come in pairs, with intake and exhaust working in tandem; rocker arms or rockers connect to the camshaft, transmitting motion to the valves; springs ensure good valve sealing; auxiliary components like pushrods are common in OHV designs. In actual maintenance, common issues include camshaft wear or valve seat deformation, leading to air leaks or excessive noise, which affects fuel consumption. I recommend regular oil changes to reduce friction and using diagnostic tools to check timing accuracy, avoiding costly overhauls.
Having driven for many years, I know the valve train significantly impacts performance. Simply put, the camshaft acts like a commander, regulating the opening and closing timing of the valves; the valves are responsible for opening and closing the intake and exhaust ports; other components like springs and rocker arms help coordinate the movement. When everything works in harmony, acceleration is smooth, noise is reduced, and fuel efficiency improves. I always remind drivers to regularly check valve clearance—too tight or too loose can cause shaking or misfires. Before long trips, it’s best to briefly listen to the engine sound and seek repairs promptly if anything sounds abnormal.
