R&D 4" Flexible Coupling for YANMAR - 910-002

The R&D Flexible Couplings are fabricated from a contoured flexible disc molded in tough yet resilient new type polyurethane.

The contoured disc gives clearance for the bolt heads, and is able to flex freely to take up any temporary misalignment of the engine and shaft, due to flexing of the boat structure or the engine moving on its rubber vibration isolation mountings.

Forward thrust is taken in compression on the disc between the two half couplings and reverse thrust is taken again in compression on the disc between the two fail straps.

In the unlikely event of a disc failure the steel straps make the coupling fail safe and ensure drive is maintained in both forward and reverse.

Gearbox Flange Dimensions

- Diameter: 101.6mm (4.00")

- Number of gearbox flange bolts: 4

- Coupling bolt hole nominal diameter: 10mm (0.39")

- Bolt PCD: 78mm (3.07")

- Coupling register diameter: 50.0mm (1.97")

Flexible Coupling Details

- Coupling maximum diameter: 114.3mm (4.5")

- Length: 32.5mm (1.28")

- Bolt diameter: M10

- Capacity per 100 rpm: 2.24kW 3HP

- Typical applications: Yanmar Kanzaki gearboxes

- Electrical properties: Flexible couplings are as standard non-conducting