Brezplačno inženirsko orodje
Kalkulator napetosti jermena
Izračunajte pravilno napetost jermena z metodo odklona, frekvenčno metodo ali neposredno meritvijo sile. Podpira klinaste jermene, zobate jermene in ploščate jermene.
Rezultati
Metoda odklona
Metoda odklona meri napetost jermena tako, da na sredino razpona jermena deluje znana pravokotna sila in se izmeri nastali odklon.
- T — statična napetost jermena (N)
- F — uporabljena deformacijska sila (N)
- L — dolžina prostega razpona (mm)
- d — izmerjeni odklon na sredini (mm)
Frekvenčna metoda
Frekvenčna metoda uporablja naravno frekvenco vibracij dolžine jermena. To je natančnejša in ponovljivejša metoda, zlasti za zobate jermene.
- T — napetost pramena (N)
- m — masa jermena na enoto dolzine (kg/m)
- L — dolžina prostega razpona (m)
- f — izmerjena naravna frekvenca (Hz)
Priporočena območja napetosti
| Vrsta jermena | Napetost na jermen (N) | Smernica za odklon |
|---|---|---|
| Klinasti jermen SPZ | 150–350 | 1,6 mm na 100 mm razpona |
| Klinasti jermen SPA | 200–500 | 1,6 mm na 100 mm razpona |
| Klinasti jermen SPB | 300–700 | 1,6 mm na 100 mm razpona |
| Klinasti jermen SPC | 500–1200 | 1,6 mm na 100 mm razpona |
| Zobati jermen (HTD) | Po specifikaciji proizvajalca | Priporočena je frekvenčna metoda |
| Ploski jermen | 200–1000 | Spreminja se glede na širino |
Praktični primer
Dano: Razpon L = 1500 mm, sila F = 20 N, odklon d = 5 mm
T = (20 × 1500) / (4 × 5) = 30000 / 20 = 1500 N na pramen
Dano: Masa m = 1,2 kg/m, razpon L = 0,5 m, frekvenca f = 45 Hz
T = 4 × 1,2 × 0,5² × 45² = 4 × 1,2 × 0,25 × 2025 = 2430 N
⚠️ Opomba: Nove jermene je treba napeti za 20–30% višje od nazivne vrednosti, da se kompenzira začetno raztezanje. Ponovno jih napnite po 24–48 urah delovanja.
There are three main methods:
- Deflection method: Apply a known force perpendicular to the belt at the midpoint of the span. Measure the deflection. Use the formula T = (F × L) / (4 × d).
- Frequency method: Pluck the belt span and measure the vibration frequency with a sensor or app. Use T = 4 × m × L² × f².
- Direct measurement: Use a dedicated belt tension gauge (e.g., Gates Krikit, Optibelt TT) to read the tension directly.
The frequency method is generally more accurate and repeatable. It eliminates human error in force application and deflection measurement. It is especially preferred for timing belts where precise tension is critical.
The deflection method is simpler and requires only a ruler and a spring scale. It is adequate for V-belts and general industrial use.
Too loose: Belt slipping, squealing noise, heat generation, premature wear, reduced power transmission efficiency, and inconsistent speed.
Too tight: Excessive bearing loads, premature bearing failure, shaft deflection, belt fatigue and cracking, increased energy consumption.
Recommended schedule:
- After installation: Check after first 24–48 hours (initial stretch)
- Routine: Every 3–6 months during scheduled maintenance
- After events: After any drive modification, motor replacement, or unusual vibration/noise
Keep a log of tension readings to track belt condition over time.
Yes. New belts undergo significant initial stretch during the first hours of operation. Best practice:
- Tension new belts 20–30% above the nominal target value
- Run the drive for 24–48 hours
- Re-tension to the normal operating value
- Check again after one week of operation
Used belts that have already stabilized can be tensioned directly to the nominal value.
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Profesionalni instrumenti in programska oprema za uravnoteženje na terenu. Spremljanje vibracij za opremo z jermenskim pogonom. Uporabljajo se v več kot 50 državah.
