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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