Mabearings Ozungulira Olimba

Ma bearing ozungulira ozungulira amakhala ndi ma roller ambiri aatali, ofanana, komanso aatali, zomwe zimawathandiza kupirira katundu wolemera wokhazikika. Ma geometry apadera a raceway ndi mawonekedwe abwino kwambiri a pamwamba pa ma bearing a Type C ndi CA amachepetsa kukangana. Poyerekeza ndi ma bearing ozungulira ozungulira, mapangidwe awa amagwira ntchito kutentha kochepa, amathandizira katundu wolemera wa axial, ndipo amafika pa liwiro lalikulu. Ma bearing ozungulira a HRB amapezeka ndi ma bore a cylindrical kapena tapered. Ma bearing a series 240 ndi 241 ali ndi bore yocheperako yokhala ndi taper ya 1:30 (suffix code K30), pomwe ma bearing ena ali ndi bore yocheperako yokhala ndi taper ya 1:12 (suffix code K).

Mapangidwe a Mtundu C ndi EC
Maberiya awa ali ndi ma symmetrical rollers ndi khola lachitsulo losindikizidwa. Mphete yotsogolera ili pakati pa mphete yamkati. Maberiya a Type EC amakhala ndi ma rollers olimbikitsidwa kuti awonjezere mphamvu yonyamula katundu. Maberiya a Type C amagwiritsa ntchito kumaliza bwino pamwamba pa ma rollers ndi mipikisano kuti apititse patsogolo chitsogozo cha ma rollers ndikuchepetsa kukangana.

Mtundu wa CA ndi ECA Designs
Maberiya awa ali ndi ma symmetrical rollers ndi ma flanges pa mphete yamkati. Mphete yotsogolera imayikidwa pakati pa mizere iwiri ya ma rollers ndipo imayikidwa pakati pa mphete yamkati. Khola ndi kapangidwe ka mkuwa kapena chitsulo chopangidwa ndi makina amodzi. Maberiya a Type CA ndi ECA amagwiritsa ntchito mawonekedwe ofanana ndi maberiya a Type C. Maberiya a Type ECA amaphatikizapo ma rollers olimbikitsidwa kuti awonjezere mphamvu yonyamula katundu.

Kuti mafuta azigwiritsidwa ntchito bwino, ma bearing ozungulira a HRB okhazikika amakhala ndi ma groove amafuta a annular ndi mabowo atatu amafuta pa mphete yakunja, kupatula ma bearing a Type C okhala ndi mainchesi akunja pansi pa 150 mm kapena 180 mm (amasiyana malinga ndi mndandanda) ndi ma bearing onse a mndandanda wa 213. Khodi yomaliza W33 imatanthauza ma bearing (Mitundu C, EC, CA, ndi ECA) okhala ndi ma groove amafuta ndi mabowo pa mphete yakunja.

Kapangidwe ka ma bearing ozungulira ozungulira kumathandiza kuti azidzigwirizanitsa okha, zomwe zimawathandiza kuti azigwirizana ndi kusiyana kwa mphete zamkati ndi zakunja. Pansi pa katundu wabwinobwino komanso momwe ntchito ikuyendera, miyeso yovomerezeka yosagwirizana panthawi yozungulira mphete yamkati imaperekedwa patebulo lomwe lili kumanja.

Mabearing ozungulira ozungulira okhala ndi mabowo ozungulira kapena opindika amapangidwa ndi ma tolerances okhazikika (abwinobwino), monga momwe zalembedwera mu Table 9.4.

Ma bearing ozungulira ozungulira amaperekedwa ndi chilolezo chamkati cha radial. Komabe, ntchito zambiri zimafuna ma bearing okhala ndi chilolezo cha C3, ndipo ena amafunikira chilolezo chachikulu cha C4. Makulidwe ena amapezeka ndi chilolezo cha C2 (chocheperako kuposa chachizolowezi). Malire a ma grade osiyanasiyana a clearance alembedwa mu Matebulo 5.25 ndi 5.26 (Masamba 67–68) ndipo akutsatira ISO 5753:1981. Ma mtengo awa amagwira ntchito ku ma bearing osatulutsidwa omwe ali mu mkhalidwe wosakwezedwa.

Ma bearing ozungulira okhazikika amalandira chithandizo chapadera cha kutentha, kuonetsetsa kuti palibe kusintha kwakukulu komwe kumachitika kutentha kopitilira +200°C.

Kuti zitsimikizire kuti zikugwira ntchito bwino, ma bearing ayenera kupatsidwa katundu wochepa. Ma bearing ozungulira ozungulira nawonso ndi osiyana. Popanda katundu wokwanira, mphamvu zopanda mphamvu za ma rollers ndi khola, pamodzi ndi kukangana kwa mafuta, zitha kusokoneza kwambiri momwe ma rollers amayendera pa liwiro lalikulu, zomwe zingayambitse kutsetsereka kowononga pakati pa ma rollers ndi ma raceways. Katundu wocheperako wofunikira wa radial ukhoza kuyerekezeredwa pogwiritsa ntchito njira iyi:

F_{rm} = 0.02C_r

Kumene:

· F_{rm}: Kulemera kochepa kwa radial (N)
· C_r: Kuyesa kwamphamvu kwa mphamvu (N)

Kulemera kwa zinthu zothandizira pamodzi ndi mphamvu zakunja nthawi zambiri kumaposa zomwe zimafunika pa katundu wocheperako. Ngati sichoncho, katundu wowonjezera wa radial (monga kupsinjika kwa lamba kapena mphamvu yosagwira ntchito) ayenera kugwiritsidwa ntchito.

· Pamene \frac{F_a}{F_r} \leq e:

P = F_r + Y_1 F_a

· Pamene \frac{F_a}{F_r} > e:

P = 0.67F_r + Y_2 F_a

Ma coefficients owerengera e, Y_1, ndi Y_2 a bearing iliyonse amaperekedwa m'matebulo operekera.

P_0 = F_r + Y_0 F_a

Chiwerengero cha mawerengedwe a Y_0 pa bearing iliyonse chaperekedwa m'matebulo operekera mabearing.