Steel Spring Coupling
Lo-Rez steel-spring couplings are designed for consistent, reliable torsional performance. Their stiffness remains stable over time and is unaffected by age, wear, temperature, load, or vibration. This ensures highly accurate torsional analysis, with coupling resonance often predictable within ±2%.
Key Features
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High accuracy – Predictable torsional stiffness within 8%.
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Wide range – Twelve housing sizes (D to N) with torque ratings up to 942,000 Nm.
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Durable springs – Always under compression, with built-in overload stops to prevent excessive stress.
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Friction dampers – Control large, low-frequency oscillations.
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Low maintenance – No lubrication required (except when using a pilot bearing).
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Easy installation – Can be fitted or removed without moving connected equipment.
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Misalignment capacity – Axial, angular, and lateral stiffness proportional to torsional stiffness.
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Flexible configurations – Available in multiple arrangements.
RT Steel-Bolted Rubber Couplings
The RT coupling is typically installed aft of the gearbox on resiliently-mounted engines. It reduces bending stresses on the gearbox output shaft while providing mechanical flexibility and noise reduction. With its high-damping elastomer elements, it also offers excellent vibration and acoustic attenuation, achieving Dynamic Magnifier values as low as 3.5
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Key Features
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Handles two-directional propeller thrust and two-directional torque
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Low torsional, angular, and radial stiffness for tuning, misalignment tolerance, and shock absorption
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Strong noise and vibration damping properties
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Open design for easy inspection, cooling, and low maintenance
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Equal axial stiffness in forward and reverse thrust for accurate frequency calculations
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No lubrication required
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Certified by A.B.S. and Lloyd’s Register
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Shock tested to U.S. MIL-S 901C (MOD.)
Steel spring Vibration Isolators
General Description
Lo-Rez Steel Spring Vibration isolators incorporate a limit stop to prevent excessive vertical motion and rocking motion of isolated equipment in ships. The neoprene bumpers can be easily adjusted to accommodate the actual working height of the isolator as well as to limit the random motions to any desired degree.
The leveling screw and the additional cap screws securely fasten the equipment sub-base to the top of the isolator. As with all LO-REZ isolators there are neoprene dampers inside each end of the isolator (adjustable at one end) to withstand longitudinal and lateral (including crash) forces – so obviating the need for any external chocks.
BR-LS
The BR-LS isolator, available in 5 housing sizes, load capacity range from 225 N to 71 kN (see brochures).
BR-T (Thrust)
The BR-T isolator, available in 3 housing sizes, load capacity range from 3.5 kN to 51 kN (see brochures).
The BR-T isolators have special flexible thrust carrying devices which permit them to carry full thrust load without “locking up” so that they are capable of providing effective isolation of the engine-generated vibration over the entire speed range.
Soft-Mount Package
The Soft-Mount system is designed to provide superior vibration and noise isolation for propulsion engines with integral gearboxes. It combines BR-T type isolators and the RT coupling, both engineered to carry full propeller thrust while maintaining isolation across the entire speed range.
Key Benefits
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Reduces gearbox and shaft bearing loads through flexible coupling design
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Minimizes noise and vibration from engine and gearbox transmission into the vessel structure
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Absorbs propeller thrust pulsations for smoother operation
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Proven reliability, with over 400 vessels already equipped with this system
Torque Limiter
Torque Limiters, designed to protect propulsion and power transmission systems from damage caused by overloads or sudden torque spikes. These high-quality units provide precise, mechanical overload protection — eliminating the need for slow electrical overloads, shear pins, or overheating slip clutches.
With Lo-Rez Torque Limiters, nothing breaks and nothing needs replacing — helping you avoid unnecessary downtime and costly repairs.
Key Features:
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Positive drive with no slip
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Maintains shaft-to-shaft timing, even after re-engagement
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Quick and easy re-engagement
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Full bi-directional operation
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Consistent release torque setting
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Secure adjustment system prevents unauthorized changes but allows easy tuning when required
