What is the bearing static safety factor s0?

The static safety factor s0 is the ratio of the basic static load rating C0 to the actual static equivalent load P0. It ensures the bearing does not suffer permanent deformation under static or shock loads. s0 = C0 / P0.

What minimum s0 should I use?

Use the current guideline table of the exact bearing manufacturer. The value depends on ball/roller type, motion, load certainty, shock and the acceptable effect of permanent deformation or quiet-running requirement. This calculator does not assign a universal minimum.

What happens if s0 is too low?

If s0 is below the recommended minimum, the bearing may develop permanent indentations (brinelling) in the raceways. This leads to increased noise, vibration, and premature fatigue failure.

How do I determine P0?

Use the ISO 76 method or the current product table for the exact bearing. X0, Y0, applicability conditions and any radial/axial comparison depend on bearing type and design; do not use one generic equation for every bearing.

When should static load capacity be checked?

Check static capacity for stationary or slowly oscillating bearings and for peak, shock or impact loads, including peaks in otherwise rotating service. Dynamic rating-life analysis does not replace this check.

免費工程工具 #045

軸承靜態安全係數計算器

計算 s₀=C₀/P₀ 使用目錄中的 C₀ 以及正確確定的 P₀。從當前製造商指南中選擇所需的最低值。

ISO 76:2006 + Amd 1:2017 s₀ = C₀/P₀ 無通用 PASS/FAIL

結果

靜態安全係數 s₀

—

靜態安全係數

依據 ISO 76，靜態安全係數為基本靜態額定負荷與實際靜態當量負荷之比：

C₀ — 基本靜態額定負荷 (kN)，來自軸承目錄
P₀ — 靜態當量負荷 (kN)，由實際徑向與軸向力計算得出

選擇所需的係數

ISO 76:2006 規範了靜額定值/當量負荷，並包含針對重負荷應用的指南。製造商表格增加了應用區分。切勿將其簡化為單一滾珠/滾子閾值。

對於截斷接觸、異常負荷分佈、不對中、預壓、超大游隙、塗層或特殊表面處理，ISO 76 計算可能不適用。在這些情況下請諮詢製造商。

實務範例

計算比率範例 — 標稱目錄值

已知： C₀ = 31.5 kN, P₀ = 12 kN, 正常運轉

s₀ = 31.5 / 12 = 2.63

比較 s₀=2.63 與適用的當前製造商指南進行比較；僅此運算無法確定 PASS/FAIL。

ℹ️ 範圍： 對於已知峰值、衝擊或衝擊負荷的旋轉服務，也應檢查靜容量。動態額定壽命不能取代靜態檢查。