Breaker arm with contact points at the left. The pivot is on the right and the cam follower is in the middle of the breaker arm.

A contact breaker (or "points") is a type of electrical switch, and the term typically refers to the switching device found in the distributor of the ignition systems of spark-ignition internal combustion engines. breaker points, inside the distributor of an internal combustion engine scan, upload by MH 18:59, 2004 Aug 22 (UTC) This image has been released into the public domain by the copyright holder, its copyright has expired, or it is ineligible for copyright. ... breaker points, inside the distributor of an internal combustion engine scan, upload by MH 18:59, 2004 Aug 22 (UTC) This image has been released into the public domain by the copyright holder, its copyright has expired, or it is ineligible for copyright. ... Electrical switches. ... This article is about distributors in internal combustion engines. ... The ignition system of an internal-combustion engine is an important part of the overall engine system that provides for the timely burning of the fuel mixture within the engine. ... A colorized automobile engine The internal combustion engine is a heat engine in which the burning of a fuel occurs in a confined space called a combustion chamber. ...

Purpose

The purpose of the contact breaker is to interrupt the current flowing in the primary circuit of the ignition coil. When this occurs, the collapsing current induces a high voltage in the secondary winding of the coil, which has very many more turns. This causes a very large voltage to appear at the coil output for a short period - enough to arc across the electrodes of a spark plug. In electricity, current refers to electric current, which is the flow of electric charge. ... An ignition coil (also called a spark coil) is an electrical device in a automobiles ignition system which transforms a storage batterys 12 volts to the thousands of volts needed to spark the spark plugs. ... Electromagnetic induction is the production of an electrical potential difference (or voltage) across a conductor situated in a changing magnetic flux. ... International danger high voltage symbol. ... This article or section should include material from Spark gap A spark plug is an electrical device that fits into the cylinder head of some internal combustion engines and ignites compressed aerosol gasoline by means of an electric spark. ...

Operation

The contact breaker is operated by an engine-driven cam, and the position of the contact breaker is set so that they open (and hence generate a spark) at the exactly correct moment needed to ignite the fuel at the top of the piston's compression stroke. The contact breaker is usually mounted on a plate that is able to rotate relative to the camshaft operating it. The plate is rotated by a centrifugal mechanism, thus advancing the timing (making the spark occur earlier) at higher revolutions. This gives the fuel time to burn so that the resulting gases reach their maximum pressure at the same time as the piston reaches the top of the cylinder. The plate's position can also be moved a small distance using a small vacuum-operated servomechanism, providing advanced timing when the engine is required to speed up on demand. This helps to prevent pre-ignition (or pinging). A cam is a projecting part of a rotating wheel or shaft that strikes a lever at one or more points on its circular path. ... Double overhead cams control the opening and closing of a cylinders valves The camshaft is an apparatus used in piston engines to operate poppet valves. ... Timing refers to how events are spaced in time. ... A piston and cylinder from a steam engine A cylinder in an internal combustion engine is the space within which a piston travels. ... Look up Vacuum in Wiktionary, the free dictionary For other uses, see vacuum (disambiguation) A vacuum is a volume of space that is empty of matter, including air, so that gaseous pressure is much less than standard atmospheric pressure. ... Small R/C servo mechanism 1. ... It has been suggested that Detonation internal combustion engine be merged into this article or section. ... Knocking (also called pinking or pinging)—technically detonation— in internal combustion engines occurs when fuel in the cylinder is ignited by the firing of the spark plug but burns too quickly, combusting completely before the optimum moment during the compression phase of the four-stroke cycle. ...

Las desventajas del == del == de los trituradores de contacto puesto que abren y cierran varias veces cada vuelta del motor, de los puntos del triturador de contacto y del seguidor de leva sufren de desgaste - mecánico y de las picaduras causadas formando arcos a través de los contactos. Este último efecto es prevenido en gran parte colocando a condensador parallel paralelo a través del triturador de contacto - esto es referida generalmente por el término más pasado de moda condensador por los mecánicos. Así como suprimir la formación de arcos, ayuda a alza la salida de la bobina creando un resonante circuito del LC con las bobinas de la bobina. Una desventaja de usar un interruptor mecánico como parte de la sincronización de ignición es que no es muy exacta, necesita el ajuste regular del dchuchaetención (contacto) ángulo, y en revoluciones más altas, su masa llega a ser significativa, conduciendo a la operación pobre a velocidades del motor más altas. Estos efectos se pueden superar en gran parte usando los sistemas de ignición electrónicos, donde los trituradores de contacto retro son cabidos por sensor un dispositivo sin masa. Categoría: Tecnologías automotoras franco: Rupteur Retro, short for retrospective, is a modern term used to describe things from a bygone era. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...