VSP 22
A compact coaxial direct‑drive gearbox designed to couple a Voith Schneider cycloidal propeller to the main engine at the same shaft speed (≈200 rpm).
Inspector Detail
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Common issues
- Coupling misalignment between engine output and gearbox input causing vibration
- Lube oil contamination or water ingress affecting gear and bearing wear
- Bearing wear from the continuous reversing/maneuvering loads typical of VSP-driven vessels
- Oil seal leakage at the input or output shaft
- Torsional vibration issues if the coupling flexible element degrades
Inspection checklist
- Check lube oil level, condition, and water content
- Inspect input/output shaft seals for leakage
- Check coupling alignment and flexible element condition
- Monitor gearbox bearing temperature and vibration during running
- Inspect the oil filter/strainer for metal particles indicating wear
- Check mounting bolts and foundation for tightness
- Inspect casing joints and inspection covers for oil leaks
Service intervals
| Lube oil sample analysis | every 500-1000 running hours |
| Lube oil change | typically annually or per oil analysis result |
| Alignment check | after any engine/gearbox disturbance, otherwise annually |
| Full internal inspection (gears, bearings) | per the maker's running-hour interval, condition-based |
| Oil filter element change | per maker's schedule or differential pressure indication |
Typical wear limits
| Bearing clearance and gear tooth wear | assess against the maker's tolerance table at inspection rather than a generic figure, given the specialized coaxial design |
| Coupling flexible element condition | replace at first sign of cracking or permanent set, per the maker's guidance |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Input/output shaft oil seals
- Coupling flexible element
- Lube oil filter element
- Bearing set as advised by the maker for this size
Safety
- Rotating shaft and coupling - guards must be in place before running
- Isolate the drive (engine and any PTO) before opening the gearbox casing
- Heavy gearbox components - use correct lifting points and gear when removing casing covers
Class survey
As part of the propulsion train coupling the main engine to a Voith Schneider Propeller, this gearbox is typically examined alongside the VSP unit at Continuous Survey Machinery or Special Survey intervals, with attention to alignment, oil condition, and coupling integrity given the continuous reversing duty typical of VSP installations.
Components & Design
Component data being added…
Technical Data
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