Definition of camshaft in US English:



  • A shaft with one or more cams attached to it, especially one operating the valves in an internal combustion engine.

    • ‘This approach is typically used in manufacturing camshafts, crankshafts, valves, pistons - just about any machined part that goes into an automobile engine these days.’
    • ‘But unlike a living brain that controls heart rate and respiration, a conventional camshaft can't alter the valve events.’
    • ‘To save additional space, the exhaust camshafts are driven by secondary chains attached to the intake camshafts, and the starter motor is mounted directly above the transmission.’
    • ‘Both engines incorporate dual-overhead camshafts and four valves per cylinder.’
    • ‘Like the previous engine, it uses twin overhead camshafts with four valves per cylinder, along with variable timing on the inlet valves, which combines with the variable inlet manifold to maximize torque spread.’
    • ‘The combination of a center-mounted spool valve and check valve allow the camshaft's torsional energy to assist actuation, rather than oppose it.’
    • ‘Rather than open and close its valves with conventional camshaft, pushrods or cam chain, lifters, rocker arms and valve springs, the camless engine employs an electro-hydraulic actuator mounted above the valves.’
    • ‘Rotaries extract disproportionate power from small capacity engines and, because they need no pistons, valves, camshafts and belts, are free-revving and smooth as velvet.’
    • ‘For example, electromechanical actuators could replace standard camshafts for controlling valve opening.’
    • ‘Since the advent of common rail fuel injection, the mechanical camshaft no longer plays a role in fuel management.’
    • ‘A timing belt or timing chain links the crankshaft to the camshaft so that the valves are in sync with the pistons.’
    • ‘The newer model has just four cylinders but has been beefed up in other areas with twin overhead camshafts, four valves per cylinder, turbocharger, intercooler and an electronically controlled, high pressure, fuel injection system.’
    • ‘During conventional combustion engine operation, the camshaft causes the intake and exhaust valves to open and close in a synchronized fashion to let in air and fuel and to let out exhaust.’
    • ‘It has no crankshaft, camshafts, oil pump or valvetrain.’
    • ‘The engine is a 1.8 litre petrol with twin overhead camshafts and 16 valves.’
    • ‘The result is a 2.2-litre engine with 16 valves, twin overhead camshafts and a pair of vibration-reducing balancer shafts.’
    • ‘Opening and closing the 20 valves are new camshafts.’
    • ‘Such performance required what was then advanced technology: fuel injection, twin camshafts, often four valves per cylinder.’
    • ‘By placing a cam phasing system on the camshaft, a pushrod engine can be tuned to take much higher levels of exhaust gas recirculation.’
    • ‘Built to perform a wide range of activities - from playing a trumpet to simulating the digestive system of a duck - these automata, powered by intricate systems of gears and camshafts, were miracles of craftsmanship and mechanical skill.’