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軸承內部游隙計算器
根據 ISO 5753-1，依軸承內徑與游隙級別查詢滾動軸承的徑向內部游隙。涵蓋 C2、CN、C3、C4 與 C5 級別。
結果
所選內徑的所有游隙級別
| 級別 | 最小值 (μm) | 最大值 (μm) | 中點值 (μm) |
|---|
什麼是內部游隙？
軸承內部游隙是指一個軸承套圈相對於另一個套圈在徑向方向上可移動的總距離。ISO 5753-1 針對徑向滾動軸承對此進行了定義。
游隙以範圍（最小值至最大值）的形式，針對每個內徑分組與游隙級別進行規定。製造出的軸承實際游隙將落在該範圍內。
游隙級別
| 級別 | 說明 | 典型用途 |
|---|---|---|
| C2 | 小於正常 | 精密主軸、低噪音應用 |
| CN | 正常（預設） | 通用機械、標準條件 |
| C3 | 大於正常 | 電動機、泵、高溫環境 |
| C4 | 大於 C3 | 重過盈配合、高溫環境 |
| C5 | 大於 C4 | 極高溫度、大過盈配合 |
配合與溫度的影響
安裝後（運轉時）的游隙總小於未安裝時的游隙，原因如下：
- 過盈配合 — 軸配合會使內圈膨脹，從而減少游隙
- 溫度 — 內圈溫度通常高於外圈
實務範例
已知： d = 50 mm，游隙等級 = C3
根據 ISO 5753-1 表格（內徑範圍 40–50 mm）：
C3 游隙： 20 – 43 μm
中間值：(20 + 43) / 2 = 31.5 μm
⚠️ 注意： 此表格適用於徑向球軸承（深溝球、角接觸）。滾子軸承、調心滾子軸承及球面滾子軸承依據 ISO 5753-1 擁有不同的游隙表格。
Internal clearance is the total distance through which one bearing ring can be moved relative to the other in the radial direction (radial clearance) or axial direction (axial clearance). It is measured before mounting and is critical for proper bearing function, load distribution, and service life.
Too little clearance causes overheating and premature failure. Too much clearance results in noise and uneven load distribution.
C3 clearance (greater than Normal) is recommended when:
- The bearing operates at elevated temperatures (inner ring hotter than outer)
- There is a tight interference fit on the shaft
- Both conditions apply (common in electric motors and pumps)
C3 is the most commonly specified non-standard clearance class for industrial applications.
Temperature causes thermal expansion of bearing components. The inner ring, which is in contact with the shaft and closer to the heat source, typically heats more than the outer ring.
This differential expansion reduces the radial clearance. For high-temperature applications (above ~70°C on the inner ring), select a larger clearance class (C3, C4, or C5) to ensure adequate operating clearance remains.
An interference fit on the shaft expands the inner ring raceway, directly reducing radial clearance. The amount of clearance reduction depends on:
- Magnitude of the interference
- Bearing bore diameter and cross-section
- Material properties (steel expansion coefficient)
Rule of thumb: clearance reduction ≈ 70–90% of the radial interference on the shaft. This is why bearings with interference fits often require C3 or greater clearance.
本頁所述的操作流程由 Vibromera 團隊使用 Balanset-1A（一款用於現場轉子平衡的便攜式雙通道動平衡儀及振動分析儀）開發並經過實地測試。
專業現場動平衡儀器與軟體。實現現場 ISO 合規。已應用於 50 多個國家。
