Flexible Shaft Couplings

Product catalog summary

Overview: R & D Marine provides a range of flexible shaft couplings for engines from 5 to 1500 HP. These couplings are designed to minimize engine noise and vibration, are fail-safe, and require no machining for installation. They are easy to install, align, and are resistant to salt water, diesel, and lubrication oils. Available globally, they are competitively priced.

Specifications: Made from polyester elastomer, these couplings can handle propeller thrust, eliminating the need for separate thrust bearings. They offer electrical continuity with an optional earthing connector.

Installation: Installation involves bolting the coupling between existing shaft flanges. Alignment is checked using a red cone-headed bolt. Specific tightening torques are provided for different bolt sizes.

Earthing Connectors: The earthing connector is a silver-impregnated rubber strip that ensures electrical continuity. Installation involves removing bolts and straps, inserting the connector, and reassembling.

Product Range: The document lists part numbers and sizes for earthing connectors and couplings, with compatibility details for gearboxes from manufacturers like Borg Warner, Volvo, and Yanmar.

Selection Guide: Selecting the right coupling requires engine horsepower, speed, gearbox type, reduction ratio, and flange details.

Specifications: The Velvet Drive 72C 2:1 Reduction has a 3.5” flange, 2.500 diameter register, and a 4.250 PCD with four 0.437 diameter holes. Coupling power is calculated using: Horse Power of Engine x Reduction Ratio x 100 = HP/100rpm. For 2500 RPM and 150 HP, the required coupling is 910-009 Borg Warner.

Flexible Coupling Details: The R & D 910 Series couplings, made from a new polyester elastomer, accommodate misalignments and absorb thrust. They are fail-safe with steel straps and can include a silver impregnated rubber element for electrical continuity.

Manufacturers and Compatibility: Compatible with B/W, PRM, ZF-Hurth, Technodrive, Yanmar, and Volvo. Specific flange sizes and coupling references are provided for different gearbox models.

Installation and Features: Designed for engines from 5 to 1500 HP, these couplings reduce noise and vibration, are easy to install, and resist salt water, diesel, and oils. Electrical continuity is possible with an earthing connector. Available worldwide.

Contact Information: R & D Marine, Meadow Works, Clothall Road, Baldock, Hertfordshire, England, SG7 6PD. Tel: +44 (0)1462 892391, Fax: +44 (0)1462 896448, Email: [email protected], Website: www.randdmarine.com

Connector Installation Procedure:

Ensure connectors are clean.
Remove bolts and strap to access the coupling hole.
Insert the rolled earthing connector.
Reattach strap and bolts without damaging the connector.
Install the coupling as instructed.
Check electrical continuity upon installation and every 3-6 months.

Part Specifications:

Various part numbers and sizes are listed for specific coupling models.

Installation Procedure for R & D Marine Couplings:

Align engine and stern gear without the flexible coupling.
Bolt the coupling between rigid couplings.
Check alignment with feeler gauges at 90° intervals.
Ensure consistent gap for accurate alignment.
Recommended gap difference: 0.25 mm / 0.010 inch.
Run installation to working temperature and re-check torque settings.
Recommended tightening torques are provided for various bolt sizes.

Catalog excerpts

Flexible Shaft: Couplings R&D Marine has developed a wide range of competitively priced Flexible Couplings to fit all major installations. The R&D Flexible Couplings reduce engine noise, vibration transmission and are designed to accept propeller thrust, a separate thrust bearing and bulk head The couplings are made from a polyester elastomer which is not affected by salt water, diesel and lubrication fluids. If electrical continuity is required an earthing connector can be fitted in the centre of most Flexible Couplings. Installation is quick and easy as the R & D Coupling requires no machining and comes supplied with bolts to connect between the two existing shaft flanges. Checking alignment on installation and during service checks is quick and easy using the red cone headed bolt. Products are available ex-stock and worldwide through our distribution network. Reduces engine noise and vibration transmission Fail safe design Bolts between existing shaft Simple to periodically check Wide range of stock Accepts propeller thrust Impervious to salt water, diesel and lubrication oils Fast installation time Electrical continuity Worldwide availability Competitively priced

Open the catalog to page 1

Coupling Selection Guide BORG WARNER ENFIELD and SONIC DRIVES S= Shallow Case, D= Deep Case SELF CHANGE GEARS TWIN DISC SC= Shallow Case, DC= Deep Case TWIN DISC cont'd 6" Flange 13.2 mm bolt holes 910-003, 6" Flange 16.3mm bolt holes 910-006, Couplings 910-030, 910-035, 910-041 and 910-045 will require suitable adaptors for the gearbox flange

Open the catalog to page 3

INSTALLATION PROCEDURE FOR R&D MARINE COUPLINGS 1. Roughly align engine and stern gear without flexible coupling i.e. only two rigid half couplings pushed together. 2. Bolt "R & D Marine" coupling between the two rigid couplings. Tightening details as below. 3. Check alignment of engine by placing feeler gauges between the RED CONE HEADED BOLT and the rigid half coupling. Repeat for the SAME bolt at 90° intervals by 4. If the gap is the same in all four positions, the engine is accurately aligned. Recommended minimum to maximum gap difference: 0.25 mm / 0.010 inch. 5. Run installation to bring...

Open the catalog to page 4

Flexible Shaft Couplings

Flexible Shaft Couplings

Catalog excerpts

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