Mabearing a Cylindrical Roller

· Ma bearing a mtundu wa NU ali ndi ma flanges mbali zonse ziwiri za mphete yakunja ndipo alibe ma flanges pa mphete yamkati.

· Maberiya a mtundu wa N ali ndi ma flanges mbali zonse ziwiri za mphete yamkati ndipo alibe ma flanges pa mphete yakunja.

Mapangidwe awa amalola kusuntha pang'ono kwa axial ya shaft poyerekeza ndi nyumbayo, zomwe zimathandiza kusintha kwa kutalika komwe kumachitika chifukwa cha kutentha. Chifukwa chake, ndi oyenera ngati ma bearing osapezeka.

· Mabearings a cylindrical roller a mtundu wa NJ ali ndi ma flanges mbali zonse ziwiri za mphete yakunja ndi flange imodzi pa mphete yamkati.

· Mabearings a cylindrical roller a mtundu wa NF ali ndi ma flanges mbali zonse ziwiri za mphete yamkati ndi flange imodzi pa mphete yakunja.

Izi zimapereka malo ozungulira a shaft molunjika mbali imodzi.

· Mabearings a cylindrical roller a mtundu wa NUP ali ndi ma flanges mbali zonse ziwiri za mphete yakunja, flange imodzi pa mphete yamkati, ndi flange yotayirira mbali inayo. Izi zimathandiza kuti shaft ikhazikike mbali zonse ziwiri.

Mabearing a cylindrical roller olondola kwambiri okhala ndi mzere umodzi wokhala ndi bore yocheperako ya 1:12 ya ma spindles a zida zamakina amapangidwanso.

Maberiya ozungulira okhala ndi mizere iwiri amapangidwa ngati maberiya olondola kwambiri a ma spindles a zida zamakina ndipo angagwiritsidwenso ntchito mumakina ena olondola.

· Maberiya a mtundu wa NN ali ndi ma flanges pa mphete yamkati ndipo alibe ma flanges pa mphete yakunja.

· Maberiya a mtundu wa NNU ali ndi ma flanges pa mphete yakunja ndipo alibe ma flanges pa mphete yamkati.

Kuti zikhale zosavuta kukhazikitsa zida zothira mafuta, mabearing okhala ndi mipata yamafuta ndi mabowo pa mphete yakunja (chiphaso W33) amaperekedwa makamaka. Zinthu zokhala ndi mabowo ozungulira kapena opindika zimapezeka kutengera zomwe makasitomala akufuna.

Miyeso yoyambira ya ma bearing yomwe yatchulidwa m'matebulo ikugwirizana ndi ISO 15:1981.

Kusintha koyenera kwa momwe zinthu zilili pakati pa ma rollers ndi ma raceways sikuti kumangoletsa katundu wosayenera pamalo olumikizirana komanso kumathandiza kuti mphete zamkati ndi zakunja zisagwirizane bwino chifukwa cha zolakwika zoyika. Ma angles ololedwa a ma rollers a cylindrical ndi awa:

· Mabearing a mtundu wopapatiza (10, 2, 3, ndi 4): mphindi 3.5 za arc

· Mabearing amitundu yosiyanasiyana (22 ndi 23): 1.5 arcmintes

Ma ngodya akuluakulu opendekera akhoza kuloledwa kutengera kukula kwa katundu ndi nthawi yomwe ntchitoyo ikufunika. Ma bearing a roller okhala ndi mizere iwiri salola ngodya iliyonse yopendekera.

Maberiya ozungulira okhala ndi mzere umodzi amapangidwa ndi ma tolerances mpaka P5 grade. Kuphatikiza apo, maberiya ozungulira okhala ndi mzere umodzi ndi mizere iwiri okhala ndi mabowo opindika a spindles za zida zamakina amapangidwa ndi ma tolerances apamwamba a P5 grade, komanso magulu apadera a tolerances SP ndi UP.

Maberiyani ozungulira a mzere umodzi amaperekedwa ndi chilolezo choyambira cha gulu. Maberiyani ozungulira mzere umodzi amathanso kuperekedwa ndi chilolezo cha gulu la C3, ndipo kukula kwina kumapezeka ndi chilolezo cha gulu la C4. Maberiyani ozungulira a mzere umodzi amaperekedwa ndi chilolezo cha gulu la C1 monga muyezo. Maberiyani okhala ndi ma bore ozungulira angaperekedwenso ndi chilolezo cha gulu la C2 kapena C3, pomwe ma bearings ozungulira angaperekedwe ndi chilolezo cha gulu la C2.

Makhola okhazikika a ma bearings a mzere umodzi ozungulira alembedwa patebulo ili pansipa. Makhola a ma bearings a NU, NJ, NF, ndi NUP nthawi zambiri amakhala ofanana ndi a ma bearings a mtundu wa N.

Mabeyala okhala ndi zikwama za nayiloni 66 zolimbikitsidwa ndi ulusi wagalasi (chikho cha TN) ndi oyenera kugwiritsidwa ntchito kutentha mpaka +120°C. Pa ntchito zomwe zimafuna kugwiritsidwa ntchito mosalekeza pansi pa kutentha kwambiri kapena mikhalidwe yovuta, mabeyala olimba amkuwa (chikho cha khodi M) amapezeka. Mabeyala okhala ndi mapangidwe wamba pogwiritsa ntchito zikwama za nayiloni 66 zolimbikitsidwa ndi ulusi wagalasi kapena zamkuwa amathanso kuperekedwa ndi zikwama zachitsulo zosindikizidwa ngati kasitomala akufuna.

Pofuna kupewa kutsetsereka koopsa pakati pa ma rollers ndi mipikisano chifukwa cha mphamvu za centrifugal panthawi yogwira ntchito mwachangu, katundu wocheperako wofunikira pa bearing ukhoza kuwerengedwa pogwiritsa ntchito njira iyi:

F_r = K_r \cdot \left(6 + 4 \frac{n}{n_r}\right) \cdot \left( \frac{d_m}{100} \right)^2

Kumene:

· F_r: Kulemera kochepa kwa radial (N)
· K_r: Chiwerengero chochepa cha katundu
· = 100 ya mabearing a mndandanda wa 10
· = 150 pa mndandanda wa 2, 3, ndi 4 ma bearing
· = 200 ya mabearing a mndandanda wa 22
· = 250 ya mabearing a mndandanda wa 23
· n: Liwiro lozungulira (r/min)
· n_r: Kuchepetsa liwiro la mafuta opaka (r/min)
· d_m: Avereji ya m'mimba mwake wonyamula = 0.5 \times (d + D) (mm)

· Mphamvu yofanana P = F_r (kN) ya mabearings a cylindrical roller onyamula katundu wa axial:
· Pa mndandanda wa magawo 2 ndi 3:
· P = F_r + 0.3F_a pamene 0 \leq \frac{F_a}{F_r} \leq 0.12
· P = 0.94F_r + 0.8F_a pamene 0.12 · Pa mndandanda wa magawo 22 ndi 23:
· P = F_r + 0.2F_a pamene 0 \leq \frac{F_a}{F_r} \leq 0.18
· P = 0.94F_r + 0.53F_a pamene 0.18 · Katundu wofanana ndi wosasinthasintha P_0 = F_r (kN)

Maberiya ozungulira a cylindrical amapangidwira makamaka kunyamula katundu wozungulira. Komabe, maberiya okhala ndi mphete zozungulira (monga NJ, NF, ndi NUP) amathanso kulandira katundu wina wa axial. Kuchuluka kwa katundu wa axial sikumatsimikiziridwa ndi mphamvu ya kutopa kwa zinthu koma ndi mphamvu yonyamula katundu ya malo otsetsereka pamalo olumikizirana pakati pa ma rollers ndi ma flanges. Izi zimadalira makamaka momwe mafuta alili, kutentha kogwirira ntchito, ndi mphamvu yotaya kutentha ya beriya.

Katundu wovomerezeka wa axial ukhoza kuwerengedwa pogwiritsa ntchito njira iyi:

F_{ap} = K_1 \cdot C_0 \cdot \left(1 - \frac{F_r}{0.8C_0}\right) \cdot \left( \frac{d \cdot D}{1000} \right) \cdot \left( \frac{1000}{n} \right)^{0.5} \cdot K_2

Kumene:

· F_{ap}: Kulemera kwakukulu kovomerezeka kwa axial (N)
· C_0: Kuyesa koyambira kwa katundu wosasinthika (N)
· F_r: Kulemera kwenikweni kwa radial (N)
· n: Liwiro logwira ntchito (r/min)
· d: M'mimba mwake wamkati (mm)
· D: Chipinda chakunja chonyamula katundu (mm)
· K_1: Koefficient (0.3 yopaka mafuta; 0.5 yopaka mafuta)
· K_2: Koefficient (0.03 yopaka mafuta; 0.05 yopaka mafuta)

Fomula yomwe ili pamwambapa imagwira ntchito pansi pa mikhalidwe yabwinobwino yogwirira ntchito ndipo ndi yovomerezeka pa katundu wokhazikika wa axial. Pa katundu wokhazikika wa axial womwe wagwiritsidwa ntchito kwakanthawi, chulukitsani zotsatira zake ndi 2; pa katundu wokhudza kugwedezeka, chulukitsani ndi 3.

Katundu wokhazikika wa axial F_a womwe umagwira ntchito pa bearing suyenera kupitirira 1.2D^2 (pomwe D ndiye m'mimba mwake wakunja mu mm). Katundu wokhudza nthawi zina sayenera kupitirira 3D^2.

Kuti muwonetsetse kuti flange ikunyamula katundu wofanana komanso kuti shaft ikugwira ntchito bwino, chisamaliro chapadera chiyenera kuperekedwa ku axial runout ya malo oyenera olumikizirana ndi ma cylindrical roller bearings omwe ali ndi katundu wambiri wa axial.

Mitundu ina ya mabearing a cylindrical roller okhala ndi mzere umodzi, monga mabearing odzitsekera okha okwanira, ingathenso kupangidwa ngati kasitomala akufuna.