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  2. Overhead valve engine - Wikipedia

    en.wikipedia.org/wiki/Overhead_valve_engine

    An overhead valve (OHV) engine, sometimes called a pushrod engine, is a piston engine whose valves are located in the cylinder head above the combustion chamber. This contrasts with flathead engines, where the valves were located below the combustion chamber in the engine block. Although an overhead camshaft (OHC) engine also has overhead ...

  3. Overhead camshaft engine - Wikipedia

    en.wikipedia.org/wiki/Overhead_camshaft_engine

    Single overhead camshaft (SOHC) engines have one camshaft per bank of cylinders. Dual overhead camshaft (DOHC, also known as "twin-cam" [4]) engines have two camshafts per bank. The first production car to use a DOHC engine was built in 1910. Use of DOHC engines slowly increased from the 1940s, leading to many automobiles by the early 2000s ...

  4. Camshaft - Wikipedia

    en.wikipedia.org/wiki/Camshaft

    A camshaft is a shaft that contains a row of pointed cams in order to convert rotational motion to reciprocating motion. Camshafts are used in piston engines (to operate the intake and exhaust valves), [1] [2] mechanically controlled ignition systems and early electric motor speed controllers . Camshafts in piston engines are usually made from ...

  5. Valvetrain - Wikipedia

    en.wikipedia.org/wiki/Valvetrain

    Valvetrain. Cutaway of a dual overhead camshaft engine. 1969 AMC V8 overhead valve engine. The rocker cover has been removed, so the pushrods, rocker arms and valve springs and valves are visible. A valvetrain or valve train is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. [1]

  6. Cylinder head - Wikipedia

    en.wikipedia.org/wiki/Cylinder_head

    Cylinder head. In a piston engine, the cylinder head (aka " head ") sits above the cylinders, [1] forming the roof of the combustion chamber. In sidevalve engines the head is a simple plate of metal containing the spark plugs and possibly heat dissaption fins. In more modern overhead valve and overhead camshaft engines, the head is a more ...

  7. Catenary maintenance vehicle - Wikipedia

    en.wikipedia.org/wiki/Catenary_Maintenance_Vehicle

    A catenary maintenance vehicle (also known as a tower wagon or tower car) is a railroad maintenance of way vehicle that is used to maintain and inspect overhead line (also known as catenary) on electrified railroad or metro tracks. [1] [2] Such vehicles are typically self-propelled by a diesel engine, to allow them to operate when power is shut ...

  8. Recloser - Wikipedia

    en.wikipedia.org/wiki/Recloser

    In electric power distribution, automatic circuit reclosers ( ACRs) are a class of switchgear designed for use on overhead electricity distribution networks to detect and interrupt transient faults. Also known as reclosers or autoreclosers, ACRs are essentially rated circuit breakers with integrated current and voltage sensors and a protection ...

  9. Overhead line - Wikipedia

    en.wikipedia.org/wiki/Overhead_line

    Overhead lines. An overhead line or overhead wire is an electrical cable that is used to transmit electrical energy to electric locomotives, electric multiple units, trolleybuses or trams. The generic term used by the International Union of Railways for the technology is overhead line. [1]

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