{"id":3343,"date":"2026-05-14T05:03:55","date_gmt":"2026-05-14T05:03:55","guid":{"rendered":"https:\/\/sprocket-chain.net\/?p=3343"},"modified":"2026-05-14T05:03:55","modified_gmt":"2026-05-14T05:03:55","slug":"chain-elongation-when-to-replace-your-drive-chain","status":"publish","type":"post","link":"https:\/\/sprocket-chain.net\/cs\/chain-elongation-when-to-replace-your-drive-chain\/","title":{"rendered":"Prodlou\u017een\u00ed \u0159et\u011bzu a kdy vym\u011bnit hnac\u00ed \u0159et\u011bz"},"content":{"rendered":"
\n

<\/p>\n

\n

<\/p>\n

\n
\n
\n
<\/div>\n

\u00dadr\u017eb\u00e1\u0159sk\u00e9 in\u017een\u00fdrstv\u00ed<\/span><\/p>\n<\/div>\n

Prodlou\u017een\u00ed \u0159et\u011bzu a kdy vym\u011bnit hnac\u00ed \u0159et\u011bz<\/h1>\n

V\u011bt\u0161ina \u0159et\u011bzov\u00fdch pohon\u016f se vym\u011b\u0148uje bu\u010f p\u0159\u00edli\u0161 brzy \u2013 vy\u0159azuj\u00ed se komponenty s zna\u010dnou zb\u00fdvaj\u00edc\u00ed \u017eivotnost\u00ed \u2013 nebo p\u0159\u00edli\u0161 pozd\u011b, pot\u00e9, co prodlou\u017een\u00ed ji\u017e p\u0159eneslo opot\u0159eben\u00ed na zuby \u0159et\u011bzov\u00e9ho kola. Tato p\u0159\u00edru\u010dka uv\u00e1d\u00ed p\u0159esnou metodu m\u011b\u0159en\u00ed a r\u00e1mec pro rozhodov\u00e1n\u00ed o v\u00fdm\u011bn\u011b, kter\u00fd pou\u017e\u00edvaj\u00ed zku\u0161en\u00ed technici \u00fadr\u017eby.<\/p>\n

Po\u017e\u00e1dejte na\u0161e techniky o ov\u011b\u0159en\u00ed va\u0161\u00ed \u0159ady \u0159et\u011bz\u016f<\/a><\/p>\n<\/div>\n<\/div>\n

<\/p>\n

<\/div>\n<\/div>\n
\n

<\/p>\n

V z\u00e1vod\u011b na extruzi polymern\u00edch f\u00f3li\u00ed v Kjongki se v roce 2023 b\u011bhem 48hodinov\u00e9 v\u00fdroby vyskytla porucha v\u00e1le\u010dkov\u00e9ho \u0159et\u011bzu #80 na hlavn\u00edm odtahov\u00e9m v\u00e1lci. Pitva nam\u011b\u0159ila prodlou\u017een\u00ed \u0159et\u011bzu 4,11 TP3T \u2013 co\u017e v\u00fdrazn\u011b p\u0159ekro\u010dilo prahovou hodnotu pro v\u00fdm\u011bnu 31 TP3T. Je\u0161t\u011b odhaluj\u00edc\u00ed bylo, co vadn\u00fd \u0159et\u011bz ud\u011blal s \u0159et\u011bzov\u00fdm kolem: \u010deln\u00ed plochy zub\u016f se po 1 400 hodin\u00e1ch provozu proti prodlou\u017een\u00e9 rozte\u010di zm\u011bnily a nov\u00fd \u0159et\u011bz instalovan\u00fd po poru\u0161e dos\u00e1hl samotn\u00e9ho prodlou\u017een\u00ed 31 TP3T b\u011bhem 900 hodin. N\u00e1klady nespo\u010d\u00edvaly jen v nepl\u00e1novan\u00fdch prostoj\u00edch \u2013 \u0161lo o t\u0159i m\u011bs\u00edce zrychlen\u00e9 spot\u0159eby \u0159et\u011bzu, ne\u017e byla kone\u010dn\u011b objedn\u00e1na nov\u00e1 sada \u0159et\u011bzov\u00fdch kol a opravena geometrie pohonu. Odkl\u00e1d\u00e1n\u00ed v\u00fdm\u011bny \u0159et\u011bzu po prahov\u00e9 hodnot\u011b prodlou\u017een\u00ed ne\u0161et\u0159\u00ed pen\u00edze; p\u0159en\u00e1\u0161\u00ed po\u0161kozen\u00ed opot\u0159eben\u00edm na \u0159et\u011bzov\u00e9 kolo a zn\u00e1sobuje n\u00e1klady na p\u0159\u00edpadnou opravu.<\/p>\n

Pochopen\u00ed toho, jak\u00fd \u0159et\u011bzec prodlou\u017een\u00ed<\/strong> Ve skute\u010dnosti je to \u2013 nejen to, jak to m\u011b\u0159it \u2013 z\u00e1klad racion\u00e1ln\u00ed politiky nahrazov\u00e1n\u00ed. Metoda m\u011b\u0159en\u00ed trv\u00e1 \u010dty\u0159i minuty. Rozhodovac\u00ed r\u00e1mec zabere dal\u0161\u00ed dv\u011b. N\u00e1sleduj\u00edc\u00ed text poskytuje oboj\u00ed.<\/p>\n

<\/p>\n

Co je vlastn\u011b prodlou\u017een\u00ed \u0159et\u011bzce \u2013 ne to, co si v\u011bt\u0161ina lid\u00ed mysl\u00ed<\/h2>\n
\n
\n

Term\u00edn \u201eprota\u017een\u00ed \u0159et\u011bzu\u201c je technicky zav\u00e1d\u011bj\u00edc\u00ed a vede k nespr\u00e1vn\u00fdm z\u00e1v\u011br\u016fm o tom, co lze ud\u011blat pro jeho zpomalen\u00ed. P\u0159i b\u011b\u017en\u00e9m provozn\u00edm zat\u00ed\u017een\u00ed nedoch\u00e1z\u00ed k \u017e\u00e1dn\u00e9mu struktur\u00e1ln\u00edmu prodlou\u017een\u00ed ocelov\u00fdch \u010dl\u00e1nk\u016f \u2013 zat\u00ed\u017een\u00ed je \u0159\u00e1dov\u011b ni\u017e\u0161\u00ed ne\u017e mez kluzu oceli. Co \u010dasem zv\u011bt\u0161uje nam\u011b\u0159enou d\u00e9lku \u0159et\u011bzu, je \u00fab\u011br materi\u00e1lu na rozhran\u00ed \u010dep-pouzdro uvnit\u0159 ka\u017ed\u00e9ho \u010dl\u00e1nku spoje.<\/p>\n

Poka\u017ed\u00e9, kdy\u017e se \u0159et\u011bz p\u0159eto\u010d\u00ed p\u0159es zub \u0159et\u011bzov\u00e9ho kola \u2013 jednou za z\u00e1b\u011br zubu \u2013 se \u010dep nepatrn\u011b oto\u010d\u00ed uvnit\u0159 otvoru pouzdra v\u00e1le\u010dku. T\u00edm se vytvo\u0159\u00ed kluzn\u00fd kontakt mezi kalen\u00fdm povrchem \u010depu a vnit\u0159n\u00edm otvorem pouzdra ze slinut\u00e9 oceli. B\u011bhem milion\u016f cykl\u016f tento kontakt odstra\u0148uje materi\u00e1l z obou povrch\u016f, \u010d\u00edm\u017e se zv\u011bt\u0161uje v\u016fle mezi \u010depy a pouzdry v ka\u017ed\u00e9m kloubu. Efektivn\u00ed rozte\u010d dan\u00e9ho kloubu \u2013 vzd\u00e1lenost od st\u0159edu \u010depu ke st\u0159edu \u010depu \u2013 se zv\u011bt\u0161uje o mno\u017estv\u00ed odstran\u011bn\u00e9ho materi\u00e1lu.<\/p>\n

U \u0159et\u011bzu ANSI #60 s nomin\u00e1ln\u00ed rozte\u010d\u00ed 19,05 mm p\u0159isp\u00edv\u00e1 ka\u017ed\u00fd \u010dl\u00e1nek opot\u0159ebovan\u00fd o 0,10 mm k celkov\u00e9mu prodlou\u017een\u00ed \u0159et\u011bzu. \u0158et\u011bz se 100 \u010dl\u00e1nky (100 \u010dl\u00e1nk\u016f), kter\u00fd se opot\u0159eboval o 0,10 mm na \u010dl\u00e1nek, je nyn\u00ed o 110 mm del\u0161\u00ed ne\u017e nov\u00fd \u2013 prodlou\u017een\u00ed je 110 \/ 1905 = 5,8%. Prahov\u00e1 hodnota pro v\u00fdm\u011bnu \u0159et\u011bzu 3% dle ANSI odpov\u00edd\u00e1 celkov\u00e9mu n\u00e1r\u016fstu p\u0159ibli\u017en\u011b 0,57 mm na 100\u010dl\u00e1nkovou sekci \u0159et\u011bzu #60, neboli pr\u016fm\u011brn\u00e9 v\u016fli mezi \u010depy a pouzdry 0,057 mm na \u010dl\u00e1nek.<\/p>\n<\/div>\n

\n
\n
Prodlou\u017een\u00ed v \u010d\u00edslech \u2014 ANSI #60<\/div>\n
\n
\n
0%<\/div>\n
Nov\u00fd \u0159et\u011bz \u2013 v\u016fle mezi \u010depem a pouzdrem p\u0159i v\u00fdrobn\u00ed toleranci (obvykle 0,008\u20130,015 mm)<\/div>\n<\/div>\n
\n
1.5%<\/div>\n
P\u0159ed\u010dasn\u00e9 opot\u0159eben\u00ed \u2013 st\u00e1le v p\u0159ijateln\u00e9m rozmez\u00ed. Zkontrolujte zuby \u0159et\u011bzov\u00e9ho kola; pokud jsou rovnom\u011brn\u00e9, nen\u00ed nutn\u00e1 \u017e\u00e1dn\u00e1 akce.<\/div>\n<\/div>\n
\n
2.5%<\/div>\n
Napl\u00e1nujte v\u00fdm\u011bnu p\u0159i p\u0159\u00ed\u0161t\u00ed pl\u00e1novan\u00e9 odst\u00e1vce. Objednejte si \u0159et\u011bz a ozuben\u00e1 kola nyn\u00ed.<\/div>\n<\/div>\n
\n
3.0%+<\/div>\n
Pr\u00e1h v\u00fdm\u011bny dle ANSI. Vym\u011b\u0148te \u0159et\u011bz A ozuben\u00e1 kola p\u0159i nejbli\u017e\u0161\u00ed mo\u017en\u00e9 p\u0159\u00edle\u017eitosti.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

Jak m\u011b\u0159it prodlou\u017een\u00ed \u0159et\u011bzce: Metoda, kter\u00e1 skute\u010dn\u011b funguje<\/h2>\n

Existuj\u00ed t\u0159i b\u011b\u017en\u00e9 p\u0159\u00edstupy k m\u011b\u0159en\u00ed prodlou\u017een\u00ed \u0159et\u011bzu \u2013 m\u011b\u0159ic\u00ed p\u00e1sma polo\u017een\u00e1 pod\u00e9l \u0159et\u011bzu, indik\u00e1tor opot\u0159eben\u00ed \u0159et\u011bzu a metoda 12\u010dl\u00e1nkov\u00e9ho posuvn\u00e9ho m\u011b\u0159\u00edtka s \u010depy. Pouze t\u0159et\u00ed metoda poskytuje p\u0159esnost pot\u0159ebnou pro spolehliv\u00e9 rozhodnut\u00ed o v\u00fdm\u011bn\u011b. Zde je d\u016fvod, pro\u010d dal\u0161\u00ed dv\u011b selh\u00e1vaj\u00ed a jak se prov\u00e1d\u00ed spr\u00e1vn\u00e1 metoda.<\/p>\n

\n

<\/p>\n

\n
\n
\u2717<\/div>\n
M\u011b\u0159ic\u00ed p\u00e1ska pod\u00e9l \u0159et\u011bzu<\/div>\n<\/div>\n
\n

P\u00e1sky se oh\u00fdbaj\u00ed, \u0159et\u011bz se proh\u00fdb\u00e1 a m\u011b\u0159en\u00ed \u201epod\u00e9l\u201c zp\u016fsobuje paralaxn\u00ed chybu. Chyba m\u011b\u0159en\u00ed p\u00e1sky \u00b12 mm na rozp\u011bt\u00ed 300 mm p\u0159edstavuje \u00b10,671 TP3T \u2013 co\u017e je v\u00edce ne\u017e dost na to, aby se \u0159et\u011bz 2,51 TP3T nespr\u00e1vn\u011b klasifikoval jako 3,21 TP3T nebo 1,81 TP3T. M\u011b\u0159en\u00ed p\u00e1sky je vhodn\u00e9 pro ov\u011b\u0159en\u00ed d\u00e9lky \u0159et\u011bzu b\u011bhem instalace, nikoli pro posouzen\u00ed opot\u0159eben\u00ed.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

\n
\n
~<\/div>\n
Indik\u00e1tor opot\u0159eben\u00ed \u0159et\u011bzu<\/div>\n<\/div>\n
\n

M\u011b\u0159idla opot\u0159eben\u00ed typu \u201ego\/no\u201c poskytuj\u00ed bin\u00e1rn\u00ed v\u00fdsledek \u201ego\/no\u201c oproti pevn\u00e9 prahov\u00e9 hodnot\u011b \u2013 jsou u\u017eite\u010dn\u00e1 jako rychl\u00e1 kontrola, ale ne jako pl\u00e1novac\u00ed n\u00e1stroj. M\u011b\u0159idlo v\u00e1m \u0159\u00edk\u00e1, \u017ee je \u0159et\u011bz opot\u0159ebovan\u00fd; ne\u0159\u00edk\u00e1 v\u00e1m, jak daleko je za prahovou hodnotou, ani jak rovnom\u011brn\u011b je opot\u0159eben\u00ed rozlo\u017eeno po cel\u00e9 d\u00e9lce \u0159et\u011bzu. Nerovnom\u011brn\u00e9 prodlou\u017een\u00ed (st\u0159\u00edd\u00e1n\u00ed pevn\u00fdch \u010dl\u00e1nk\u016f s prodlou\u017een\u00fdmi \u00faseky) je p\u0159i jednobodov\u00e9 kontrole m\u011b\u0159idlem zcela p\u0159ehl\u00e9dnuto.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

\n
\n
\u2713<\/div>\n
Metoda 12\u010dl\u00e1nkov\u00e9ho t\u0159menu<\/div>\n<\/div>\n
\n

Zm\u011b\u0159te vzd\u00e1lenost mezi \u010depy p\u0159es p\u0159esn\u011b 12 \u010dl\u00e1nk\u016f pomoc\u00ed posuvn\u00e9ho m\u011b\u0159idla s noniem nastaven\u00e9ho na vnit\u0159n\u00ed \u010delist nebo pomoc\u00ed up\u00ednac\u00edho p\u0159\u00edpravku pro m\u011b\u0159en\u00ed vzd\u00e1lenosti mezi \u010depy. Vyd\u011blte 12, abyste z\u00edskali pr\u016fm\u011brnou rozte\u010d. Porovnejte s nomin\u00e1ln\u00ed hodnotou. Opakujte na t\u0159ech m\u00edstech kolem \u0159et\u011bzov\u00e9 smy\u010dky, abyste identifikovali lokalizovan\u00e9 prodlou\u017een\u00ed. Tato metoda poskytuje p\u0159esnost \u00b10,05 mm \u2013 dostate\u010dnou k spolehliv\u00e9mu rozli\u0161en\u00ed prodlou\u017een\u00ed 2,5% od 3,0% a k identifikaci pevn\u00fdch \u010dl\u00e1nk\u016f zp\u016fsoben\u00fdch zad\u0159en\u00fdmi spoji \u010dep-pouzdro.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\n
Referen\u010dn\u00ed hodnoty m\u011b\u0159en\u00ed pro 12 \u010dl\u00e1nk\u016f \u2013 Vym\u011b\u0148te, kdy\u017e nam\u011b\u0159en\u00fd rozsah p\u0159ekro\u010d\u00ed:<\/div>\n\n\n\n\n\n\n\n\n\n\n\n
\u010c\u00edslo \u0159et\u011bzu<\/th>\nJmenovit\u00e1 rozte\u010d (mm)<\/th>\n12\u010dl\u00e1nkov\u00e1 jmenovit\u00e1 d\u00e9lka (mm)<\/th>\n2% Opot\u0159eben\u00ed \u2013 Kontrola (mm)<\/th>\n3% V\u00fdm\u011bnn\u00fd pr\u00e1h (mm)<\/th>\nOpot\u0159eben\u00ed na kloub p\u0159i 3% (mm)<\/th>\n<\/tr>\n<\/thead>\n
#35<\/td>\n9.525<\/td>\n114.3<\/td>\n116.6<\/td>\n117.7<\/td>\n0.029<\/td>\n<\/tr>\n
#40<\/td>\n12.700<\/td>\n152.4<\/td>\n155.4<\/td>\n157.0<\/td>\n0.038<\/td>\n<\/tr>\n
#50<\/td>\n15.875<\/td>\n190.5<\/td>\n194.3<\/td>\n196.2<\/td>\n0.048<\/td>\n<\/tr>\n
#60<\/td>\n19.050<\/td>\n228.6<\/td>\n233.2<\/td>\n235.5<\/td>\n0.057<\/td>\n<\/tr>\n
#80<\/td>\n25.400<\/td>\n304.8<\/td>\n310.9<\/td>\n313.9<\/td>\n0.076<\/td>\n<\/tr>\n
#100<\/td>\n31.750<\/td>\n381.0<\/td>\n388.6<\/td>\n392.4<\/td>\n0.095<\/td>\n<\/tr>\n
#120<\/td>\n38.100<\/td>\n457.2<\/td>\n466.3<\/td>\n470.9<\/td>\n0.114<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Pro\u010d maz\u00e1n\u00ed ovliv\u0148uje \u017eivotnost \u0159et\u011bzu v\u00edce ne\u017e zat\u00ed\u017een\u00ed<\/h2>\n

\"\"<\/p>\n

Nej\u010dast\u011bj\u0161\u00ed ot\u00e1zkou ohledn\u011b prodlou\u017een\u00ed \u0159et\u011bzu je: \u201eJak dlouho by mi m\u011bl \u0159et\u011bz vydr\u017eet?\u201c Odpov\u011b\u010f z\u00e1vis\u00ed t\u00e9m\u011b\u0159 v\u00fdhradn\u011b na re\u017eimu maz\u00e1n\u00ed, nikoli na \u00farovni zat\u00ed\u017een\u00ed. Konstruk\u010dn\u00ed v\u00fdpo\u010dty dle ANSI B29.1 p\u0159edpokl\u00e1daj\u00ed 15 000 hodin provozu p\u0159i minim\u00e1ln\u00edm zat\u00ed\u017een\u00ed 1% s kontinu\u00e1ln\u00edm maz\u00e1n\u00edm v olejov\u00e9 l\u00e1zni. Toto je u\u017eite\u010dn\u00fd referen\u010dn\u00ed bod, proto\u017ee odd\u011bluje tyto dv\u011b prom\u011bnn\u00e9 \u2013 pokud \u0159et\u011bz dosahuje prodlou\u017een\u00ed 3% za 2 000 hodin p\u0159i lehk\u00e9m zat\u00ed\u017een\u00ed, p\u0159\u00ed\u010dinou je t\u00e9m\u011b\u0159 jist\u011b nedostatek maziva, nikoli p\u0159et\u00ed\u017een\u00ed.<\/p>\n

\n\n\n\n\n\n\n\n\n\n
Typ maz\u00e1n\u00ed<\/th>\nTypick\u00e1 \u017eivotnost (ANSI #60, m\u00edrn\u00e9 zat\u00ed\u017een\u00ed)<\/th>\nvs. olejov\u00e1 koupel<\/th>\nPrim\u00e1rn\u00ed mechanismus opot\u0159eben\u00ed<\/th>\n<\/tr>\n<\/thead>\n
\u017d\u00e1dn\u00e9 \/ ob\u010dasn\u00e9 manu\u00e1ln\u00ed<\/td>\n800\u20132 000 hodin<\/td>\n\u221285%<\/td>\nOd\u011br kovu o kov v oblasti otvoru pro \u010dep \u2013 urychlen\u00ed opot\u0159eben\u00ed<\/td>\n<\/tr>\n
Manu\u00e1ln\u00ed ve spr\u00e1vn\u00e9m intervalu<\/td>\n3 000\u20136 000 hodin<\/td>\n\u221255%<\/td>\nP\u0159eru\u0161ovan\u00e9 maz\u00e1n\u00ed sni\u017euje pot\u0159ebu \u010depu mezi intervaly<\/td>\n<\/tr>\n
Kapkov\u00fd olejova\u010d (typ 2)<\/td>\n6 000\u201310 000 hodin<\/td>\n\u221230%<\/td>\nMezn\u00ed maz\u00e1n\u00ed \u010dep\u016f a pouzder; tlou\u0161\u0165ka filmu p\u0159i vysok\u00fdch ot\u00e1\u010dk\u00e1ch mezn\u00ed<\/td>\n<\/tr>\n
Olejov\u00e1 l\u00e1ze\u0148 (typ 3)<\/td>\n10 000\u201318 000 hodin<\/td>\nZ\u00e1kladn\u00ed hodnota<\/td>\nElastohydrodynamick\u00fd film na rozhran\u00ed \u010depu a pouzdra; minim\u00e1ln\u00ed opot\u0159eben\u00ed kovu<\/td>\n<\/tr>\n
Nucen\u00fd ob\u011bh (typ 4)<\/td>\n14 000\u201325 000 hodin<\/td>\n+40\u201370%<\/td>\nPln\u011b EHD film; chlazen\u00ed olejem sni\u017euje tepelnou degradaci na \u010depu<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
Protiintuitivn\u011b: lehce zat\u00ed\u017een\u00fd \u0159et\u011bz v such\u00e9m prost\u0159ed\u00ed se opot\u0159ebov\u00e1v\u00e1 rychleji ne\u017e st\u0159edn\u011b zat\u00ed\u017een\u00fd \u0159et\u011bz v dob\u0159e promazan\u00e9m krytu.<\/strong> P\u0159i zat\u00ed\u017een\u00ed pod p\u0159ibli\u017en\u011b 81 TP3T minim\u00e1ln\u00edho zat\u00ed\u017een\u00ed \u0159et\u011bzu p\u0159i p\u0159etr\u017een\u00ed nen\u00ed kontaktn\u00ed tlak na rozhran\u00ed \u010depu a pouzdra dostate\u010dn\u00fd k udr\u017een\u00ed elastohydrodynamick\u00e9ho filmu \u2013 olejov\u00fd film je zcela vytla\u010den a povrchy b\u011b\u017e\u00ed v podm\u00ednk\u00e1ch mezn\u00edho maz\u00e1n\u00ed nebo dokonce v such\u00e9m kontaktu. \u0158et\u011bz b\u011b\u017e\u00edc\u00ed p\u0159i zat\u00ed\u017een\u00ed p\u0159i 41 TP3T s nedostate\u010dn\u00fdm maz\u00e1n\u00edm m\u016f\u017ee dos\u00e1hnout prodlou\u017een\u00ed 31 TP3T rychleji ne\u017e \u0159et\u011bz b\u011b\u017e\u00edc\u00ed p\u0159i zat\u00ed\u017een\u00ed p\u0159i 201 TP3T s maz\u00e1n\u00edm v olejov\u00e9 l\u00e1zni. Jmenovit\u00e1 \u00fanosnost nen\u00ed m\u011b\u0159\u00edtkem odolnosti proti opot\u0159eben\u00ed \u2013 je m\u011b\u0159\u00edtkem struktur\u00e1ln\u00ed integrity. M\u00edra opot\u0159eben\u00ed je t\u00e9m\u011b\u0159 v\u00fdhradn\u011b ur\u010dena re\u017eimem maz\u00e1n\u00ed.<\/div>\n

<\/p>\n

Skute\u010dn\u00e9 n\u00e1klady na p\u0159ekro\u010den\u00ed prahov\u00e9 hodnoty pro v\u00fdm\u011bnu<\/h2>\n

Finan\u010dn\u00ed argument pro odlo\u017een\u00ed v\u00fdm\u011bny \u0159et\u011bzu po prodlou\u017een\u00ed 3% je povrchn\u011b l\u00e1kav\u00fd: \u0159et\u011bz st\u00e1le b\u011b\u017e\u00ed a nov\u00fd \u0159et\u011bz plus dv\u011b ozuben\u00e1 kola dnes stoj\u00ed v\u00edce ne\u017e ponech\u00e1n\u00ed opot\u0159ebovan\u00e9ho \u0159et\u011bzu na m\u00edst\u011b. V\u00fdpo\u010det se dramaticky zm\u011bn\u00ed, pokud se zapo\u010d\u00edt\u00e1 \u00fapln\u00e1 interakce opot\u0159eben\u00ed \u0159et\u011bzu a ozuben\u00e9ho kola.<\/p>\n

\n
\n
Vym\u011bnit na 3% (optim\u00e1ln\u00ed)<\/div>\n