Kwa nini bearing zinahitaji mzigo wa chini?

Bearing za kuporomoka zinahitaji mzigo wa chini ili kuhakikisha mawasiliano sahihi ya kuporomoka kati ya vipande vya kuporomoka na njia za mbio. Bila mzigo wa kutosha, mipira au roller inaweza kutelezesha (skid) badala ya kuporomoka, na kusababisha uharibifu wa msuguano, joto la ziada, na kushindwa mapema.

Ni nini kinachosababisha kutelezesha kwa bearing?

Kutelezesha hutokea wakati nguvu ya msuguano haitoshi kudumisha mawasiliano ya kuporomoka. Hii hutokea kwa mwendo wa kasi na mizigo midogo, hasa na mafuta ya grisi. Vipande vya kuporomoka vinaharakisha katika eneo lisilo na mzigo na kupungua kasi katika eneo lenye mzigo, na kusababisha kutelezesha.

Kipengele cha mzigo wa chini kr kinapatikanaje?

The minimum load factor kr is a bearing-specific value listed in the manufacturer's product tables. For deep groove ball bearings it is typically about 0.025. Roller bearings require proportionally higher minimum loads (manufacturers often quote Frm of roughly 0.02 C0), so this calculator uses higher equivalent factors of about 0.25 to 0.3 for roller types.

Je, aina ya mafuta inaathiri mzigo wa chini?

Ndiyo. Bearing zenye mafuta ya grisi kwa ujumla zinahitaji mizigo ya chini ya juu zaidi kuliko zile zenye mafuta ya maji kwa sababu grisi ina msongamano zaidi wa mnato, hasa wakati wa kuanza. Mnato wa kinematiki unaotumika katika fomula unapaswa kuakisi kiboresha halisi cha mafuta kwa joto la uendeshaji.

Nini kinatokea ikiwa mzigo wangu halisi uko chini ya kiwango cha chini?

Ikiwa mzigo halisi uko chini ya kiwango cha chini, unaweza: kutumia mzigo wa awali (spring ya mhimili), kutumia mpangilio wa bearing nzito zaidi, kuongeza njia ya mzigo, au kubadilisha aina ya bearing yenye mahitaji ya chini ya mzigo. Kwa mhimili wa wima, kuongeza washer yenye spring ni jambo la kawaida.

Zana ya Uhandisi ya Bure #047

Kikokotoo cha Mzigo wa Chini Zaidi wa Beari

Kokotoa mzigo wa chini wa radiali unaohitajika ili kuzuia kutelezesha kwa roller/mpira. Ingiza vipimo vya bearing, kasi, na aina ya mafuta.

Kuzuia Kutelezesha Grease / Oil Mpira & Mtengano

Bearing Bore d (mm)

Bearing OD D (mm)

Speed (RPM)

Mnato wa Kinematiki ν (mm²/s kwa joto la uendeshaji)

Bearing Type

Aina ya Mafuta

Quick presets

Results

Mzigo wa Chini wa Radial F_min

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Kipenyo cha Wastani dm

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Factor kr

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ν × n Product

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Fomula ya Mzigo wa Chini (Iliyorahisishwa)

Mzigo wa chini wa radial unaohitajika kuzuia kuteleza unakadiriwa kama:

k_r — minimum load factor from the manufacturer’s product table (typically ≈ 0.025 for deep groove ball bearings; higher equivalent values for roller bearings — see table below)
ν — mnato wa kinematiki kwa joto la uendeshaji (mm²/s)
n — kasi ya mzunguko (RPM)
d_m — mean bearing diameter = (d + D) / 2 (mm)
For grease lubrication this calculator additionally multiplies the result by a conservative factor of 1.5, since grease-lubricated bearings need a higher minimum load

Mean Diameter

Maadili ya Kawaida ya kr

Bearing Type	k_r
Kizingiti cha mpira chenye mfereji wa kina	≈ 0.025
Kizingiti cha mpira wa mawasiliano ya pembe	≈ 0.03
Kizingiti cha roller ya silinda	≈ 0.25
Kizingiti cha roller iliyopigwa kando	≈ 0.25
Kizingiti cha roller ya duara	≈ 0.3

Ball-bearing k_r values are typical of manufacturer product tables (e.g. SKF lists k_r per bearing, roughly 0.02–0.06 for deep groove ball bearings). For roller bearings manufacturers use dedicated minimum-load relations (e.g. F_rm ≈ 0.02 × C₀ or speed-based formulas); the roller factors above are approximate equivalents so that this simplified formula reproduces the same order of magnitude. Always check the exact value in the bearing product table.

Mfano wa Vitendo

Mfano — Beari ya Mpira wa Mfereji wa Kina 6208

Given: d = 40 mm, D = 80 mm, n = 3000 RPM, ν = 20 mm²/s, k_r = 0.025, oil lubrication

d_m = (40 + 80) / 2 = 60 mm

F_min = 0.025 × (20 × 3000 / 1000)^2/3 × (60 / 100)²

= 0.025 × 15.33 × 0.36 = 0.14 kN (≈ 140 N)

Cross-check with the simple rule F_min ≈ 0.01 × C₀: for a 6208 bearing (C₀ ≈ 17.8 kN) it gives ≈ 0.18 kN — the same order of magnitude.

⚠️ Note: Hii ni makadirio yaliyorahisishwa. Kwa matumizi muhimu, wasiliana na mwongozo maalum wa mzigo wa chini kutoka kwa mtengenezaji wa kizingiti. Mzigo wa chini halisi unategemea upenyo wa ndani, aina ya kisanduku, na sifa za kiboreshaji.

Kikokotoo cha Mzigo wa Chini wa Bearing | Kuzuia Kutelezesha | Zana ya Bure ya Mtandaoni

Published by admin on Febuari 15, 2026 Julai 2, 2026

Results

Fomula ya Mzigo wa Chini (Iliyorahisishwa)

Mean Diameter

Maadili ya Kawaida ya kr

Mfano wa Vitendo

Duka

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