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> Ce este overdrive, ...la o cutie de viteze automata

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Corbu'
post 28 Jun 2009, 16:52
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Tot caut in ultima vreme o masina pentru inceput pe aici si ma tot lovesc de termenul "overdrive" cand e vorba de cutiile automate. Am cautat pe internet, dar recunosc ca nu m-am lamurit 100%, informatiile ce le-am gasit sunt contradictorii.
Stiu ca overdrive scade nu stiu ce raport sub 1:1 (de ex 0.79:1), ceva cu arborele cotit, dar cum nu ma prea pricep nu am inteles. Ce stiu este ca se foloseste pe autostrada pentru economie carburant.

Ce ma intereseaza este cum ma afecteaza pe mine ca utilizator. De exemplu o cutie de viteze "4 speed automatic with overdrive" are 4 viteze + viteza de overdrive (ca o a 5 viteza) sau are doar 4 viteze care se pot "lungi" cu functia de overdrive (practic ajungi sa ai 8 rapoarte posibile)? Unele situri zic ca 4 speed with verdrive = 3 viteze + viteza de overdrive. Pe Wikipedia se mentioneaza totusi ca TOATE masinile cu cutii automate au overdrive.... si chiar la multe nu se precizeaza decat "4 speed automatic". In concluzie varza generala.

Tot ce stiu este ca NU vreau o cutie de viteze doar in 4 rapoarte, nu vreau sa ma intorc la vremurile Dacia 1300.

This post has been edited by Corbu': 28 Jun 2009, 17:01


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ArtVandelay
post 28 Jun 2009, 17:20
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ce legatura are o automata in 4 trepte cu cutia de pe dacia 1300?
eu din cate stiu overdrive inseamna ca are posibilitatea sa le schimbi si manual..dar nu-s sigur


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Iulikk
post 28 Jun 2009, 17:36
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Asta am gasit asa... repde:

Overdrive can refer to two different things. An overdrive is a device which was commonly used in automobiles to allow the choice of an extra-high overall gear ratio for high speed cruising, thus saving fuel, at the cost of less torque. Usually the final or top gear is called overdrive. Non direct drive gears increase torque multiplication at the expense of higher engine rpm and thus, decreased fuel economy.

It also refers to a combination of gearing inside a transmission or transaxle which results in the output speed being greater than the input speed. In the latter case, "overdrive" does not refer to a physically separate identifiable part/assembly.


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SSilent
post 28 Jun 2009, 17:42
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ydaniel
post 28 Jun 2009, 17:45
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overdrive e treapta de supraviteza.


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Corbu'
post 28 Jun 2009, 18:01
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Am citit ce scrie pe Wikipedia, dar nu inteleg cum actioneaza treapta de overdrive fata de treptele "normale" ale cutiei. Adica pot avea overdrive peste fiecare treapta a cutiei, e doar o treapta extra peste cele 4 sau este chiar viteza a 4 a.

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einstein1984
post 28 Jun 2009, 19:18
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E o treapta extra, insa in general in ziua de azi nu mai zice nimeni 4 +overdrive, zic direct 5. Englezii prin 70 aveau overdrive la cutii manuale, cu o transmisie planetara cu raportul 0,75:1 inseriata cu cea clasica si care se activa cu un buton de pe schimbator in treptele 3 si 4.


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Corbu'
post 28 Jun 2009, 19:56
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Ok. Deci cand zic 4 speed with overdrive inseamna 3+overdrive. Gasisem o Toyota Corolla de prin 2001 si avea 3 speed auto cu overdrive. Penal, practic ar avea 2 viteze+ overdrive pentru autostrada.

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Andy_ACS
post 28 Jun 2009, 20:01
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cand m-am plimbat eu cu automate pe schimbator in lateral se gasea un buton. Am intrebat pe cineva care folosea des automate si mi-a spus ca acela e butonulo de overdrive. Cand am intrebat pentru ce este mi-a explicat ca e folosit de exemplu la urcarea pantelor, masina va ramane intr-o treapta inferioara (nu schimba in sus). Am testat si eu pe masina pe care o conduceam, asa este. La apasarea butonului se aprindea si un martor in bord, iar o panta la care masina schimba enervant din 3 in 4 daca ridicai putin piciorul de pe acceleratie am urcat-o numai in 3 + overdrive.

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Corbu'
post 28 Jun 2009, 20:19
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Cred ca e un pic invers. Daca decuplezi overdrive masina schimba in viteza maxima de pana in overdrive, in cazul tau 3 pentru a avea putere in panta (practic nu te lasa sa folosesti viteza de overdrive). Cel putin asa am inteles pana acum de pe net.


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Andy_ACS
post 28 Jun 2009, 20:23
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E posibil, nu imi dau seama daca eu cand apasam butonul ala activam sau dezactivam overdrive, cert e ca mergea numai cu viteza 3. Iar la inca o apasare se stingea ledul din bord si chimba si in 4.

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flovld
post 29 Jun 2009, 10:56
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Tot in legatura cu cutiile automate... ce inseamna termenul "kick-down"?. Cum, cand se utilizeaza? Ce fenomene au loc in transmisie la utilizarea acestuia? Intreb si eu deoarece nu am condus "automate" pana acum.


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einstein1984
post 29 Jun 2009, 11:07
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Schimba o treapta in jos la accelerare.


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daca nu ai o toyota 4X4,ai gresit masina - negru pe alb
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Andy_ACS
post 29 Jun 2009, 11:18
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@flovld - "kick-down" se refera la momentul in care calci brusc acceleratia la podea (sa zicem ca ai nevoie intr-o depasire). In acel moment cutia schimba intr-o treapta inferioara (poate schimba chiar si mai multe trepte in jos, nu numai una). In felul acesta ai putere si cuplu sa depasesti. Unii sunt nemultumuiti ca anumite cutii mai lenese ezita unpic pana sa schimbe, in felul asta se pierde timp.

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einstein1984
post 29 Jun 2009, 11:24
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Doar cutiile cu 6 sau mai multe trepte pot schimba 2 in jos la accelerare. Trucul cu eliberat gazul si apassat din nou se poate folosi cu succes si la urcat dealuri.


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C a t a l i n
post 29 Jun 2009, 11:26
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Adică doar la cutiile manuale robotizate, cu mod de schimbare automat.


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einstein1984
post 29 Jun 2009, 11:31
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Ma scuzati, dar nu. Ma refeream la 7G tronic si ZF6HP24, transmisii automate cu angrenaje planetare. Sau daca vrei, la cea in 8 trepte de la lexus.


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SSilent
post 29 Jun 2009, 11:39
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ce model de Lexus are 8 viteze? blink.gif


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einstein1984
post 29 Jun 2009, 12:01
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Ls, evident. http://www.lexus.eu/range/ls/key-features/...-automatic.aspx


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