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La culata

La culata

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Introducción:

Introducción:

La culata es la parte del motor que cierra los cilindros por su

La culata es la parte del motor que cierra los cilindros por su parte

parte

superior, se une al bloque mediante tornillo y, para hacer estanca la

superior, se une al bloque mediante tornillo y, para hacer estanca la

unión, se

unión, se interc

intercala la junta de

ala la junta de culata. Es una pieza compleja en

culata. Es una pieza compleja en cuanto

cuanto

a su diseño y fabricación ya que ha de poseer

a su diseño y fabricación ya que ha de poseer una elevada resistencia

una elevada resistencia

a pesar de sus

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Partes de la culata

Partes de la culata

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Tipos de culata:

Tipos de culata:

Se dice que una

Se dice que una culata es de una sola pieza, cuando consta

culata es de una sola pieza, cuando consta

básicamente de un único gran elemento de fundición. Las culatas

básicamente de un único gran elemento de fundición. Las culatas

compuestas están formadas por varios elementos sueltos.

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Esencialmente las culatas se distinguen

Esencialmente las culatas se distinguen

se

segú

gún

n lo

loss si

sigu

guie

ien

nttes

es cr

crit

ite

eri

rio

os:

s:

Núm

Númer

ero

o de elem

de element

entos

os

Núm

Númer

ero

o de vá

de válvul

lvulas

as

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Numero de valvulas

Numero de valvulas

Habitualmente los motores de cuatro tiempos de los primeros años

Habitualmente los motores de cuatro tiempos de los primeros años

tenían dos válvulas por cilindro. Una válvula de e

tenían dos válvulas por cilindro. Una válvula de escape y otra de

scape y otra de

aspiración. Desde hace ya algunos años hay tendencia hacia los

aspiración. Desde hace ya algunos años hay tendencia hacia los

conceptos de válvulas múltiples,

conceptos de válvulas múltiples, ya que mejoran el cambio de

ya que mejoran el cambio de carg

carga y

a y

permiten un mayor llenado de

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Funciones :

Funciones :

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Material de culata :

Material de culata :

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Tapa de culata :

Tapa de culata :

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T

También denominado

ambién denominado "de válvulas laterales". En este sistema la

"de válvulas laterales". En este sistema la

válvula se ubica

válvula se ubica en una

en una posición lateral al cilindro, es

posición lateral al cilindro, es decir

decir, está

, está

alojada en el bloque.

alojada en el bloque. El mando de esta válvula se efectúa con el árbol

El mando de esta válvula se efectúa con el árbol

de levas situado

de levas situado en el bloque

en el bloque motor

motor. Este sistema de distribución

. Este sistema de distribución no

no

se utiliza desde hace tiempo por

se utiliza desde hace tiempo por dos inconvenientes principales:

dos inconvenientes principales:

Sistema SV

Sistema SV

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Se distingue por poseer el árbol de levas en el

Se distingue por poseer el árbol de levas en el bloque motor

bloque motor

(Generalment

(Generalmente en el

e en el sector inferior) y las válvulas dispuestas en la culata.

sector inferior) y las válvulas dispuestas en la culata.

En este sistema la transmisión de movimiento del cigüeñal al

En este sistema la transmisión de movimiento del cigüeñal al árbol de levas

árbol de levas

se hace directamente por medio de dos

se hace directamente por medio de dos piñones o con la

piñones o con la interposición de

interposición de

un tercero, t

un tercero, también se puede hacer

ambién se puede hacer por medio de

por medio de una cadena de corta

una cadena de corta

longitud. La ventaja de este sistema es que la

longitud. La ventaja de este sistema es que la transmisión de movimiento

transmisión de movimiento

entre el cigüeñal y el

entre el cigüeñal y el eje de camones necesita un mantenimiento nulo o

eje de camones necesita un mantenimiento nulo o

Sistema OHV

Sistema OHV

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Se distingue por tener el árbol de levas en la

Se distingue por tener el árbol de levas en la culata al igual que las válvulas.

culata al igual que las válvulas.

Es el sistema más utilizado en la actualidad en todos los automóviles. La

Es el sistema más utilizado en la actualidad en todos los automóviles. La

ventaja de este sistema es que

ventaja de este sistema es que se reduce considerablemente el número de

se reduce considerablemente el número de

elementos entr

elementos entre el árbol de levas y las válvulas por lo

e el árbol de levas y las válvulas por lo que la apertura y el

que la apertura y el

cierre de las válvulas es

cierre de las válvulas es más precisa y más rápida. Esto trae consigo que los

más precisa y más rápida. Esto trae consigo que los

motores puedan alcanzar mayor número de revoluciones. Tiene la

motores puedan alcanzar mayor número de revoluciones. Tiene la

Sistema OHC

Sistema OHC

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funcionamiento

funcionamiento

Depend

Dependiendo de la

iendo de la coloc

colocación d

ación del árbo

el árbol de lev

l de levas y la

as y la dist

distribuc

ribución

ión de

de

estas, accionarán directamen

estas, accionarán directamente las válvulas a

te las válvulas a través de una varilla

través de una varilla

como

como en la

en la prime

primera

ra época

época de los

de los motor

motores

es Ott

Otto,

o, sist

sistema

ema SV

SV o lo

o lo har

harán

án

med

median

iante un si

te un sist

stema de v

ema de vari

arilla

llas,

s, ta

taqués

qués yy bal

balanc

ancine

ines, es el

s, es el

sistema

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Aplicación :

Aplicación :

Los usos de los

Los usos de los

árboles de levas

árboles de levas

son muy variados, como

son muy variados, como

en

en mol

molino

inos,

s, tel

telar

ares,

es, sis

sistem

temas d

as de

e dis

distri

tribuc

bución d

ión de ag

e agua

ua o ma

o marti

rtillo

lloss

hidráulicos, aunque su aplicación más desarrollada es la relacionada

hidráulicos, aunque su aplicación más desarrollada es la relacionada

con el

con el motor de combustión int

motor de combustión interna alternativo

erna alternativo, en los que se encarg

, en los que se encarga

a

de regular tan

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Localización

Localización

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medidas

medidas

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Donde esta alojado el eje de levas

Donde esta alojado el eje de levas

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