Bepul muhandislik vositasi №047
Podshipnikka minimal yuklanish kalkulyatori
Roliklar/sharlarning sirpanishini oldini olish uchun zarur bo'lgan minimal radial yukni hisoblang. Podshipnik o'lchamlarini, tezlikni va moylash turini kiriting.
Results
Minimal yuklanma formulasi (soddalashtirilgan)
Sirpanishning oldini olish uchun zarur bo'lgan minimal radial yuklanma quyidagicha baholanadi:
- kr — 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 — ish haroratidagi kinematik yopishqoqlik (mm²/s)
- n — aylanish tezligi (RPM)
- dm — 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
Odatdagi kr qiymatlari
| Bearing Type | kr |
|---|---|
| Chuqur qatorli sharsimon podshipnik | ≈ 0.025 |
| Burchak kontaktli sharsimon podshipnik | ≈ 0.03 |
| Silindrsimon rolikli podshipnik | ≈ 0.25 |
| Konussimon rolikli podshipnik | ≈ 0.25 |
| Sferik rolikli podshipnik | ≈ 0.3 |
Ball-bearing kr values are typical of manufacturer product tables (e.g. SKF lists kr per bearing, roughly 0.02–0.06 for deep groove ball bearings). For roller bearings manufacturers use dedicated minimum-load relations (e.g. Frm ≈ 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.
Amaliy Misol
Given: d = 40 mm, D = 80 mm, n = 3000 RPM, ν = 20 mm²/s, kr = 0.025, oil lubrication
dm = (40 + 80) / 2 = 60 mm
Fmin = 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 Fmin ≈ 0.01 × C0: for a 6208 bearing (C0 ≈ 17.8 kN) it gives ≈ 0.18 kN — the same order of magnitude.
⚠️ Note: Bu soddalashtirilgan hisob-kitob. Muhim ilovalar uchun podshipnik ishlab chiqaruvchisining minimal yuklanma bo’yicha maxsus ko’rsatmalariga murojaat qiling. Haqiqiy minimal yuklanma ichki bo’shliqqa, qafas turiga va moylov xususiyatlariga bog’liq.
Professional dala balanslashtirish asboblari va tebranish analizatorlari. 50dan ortiq mamlakatda qo’llaniladi.
