Vetus BULLFLEX Flexible Coupling

The Bullflex-type Vetus elastic coupling is a response to the growing need for comfort on board the vessel. The Bullflex coupling is specially designed for optimal vibration suppression.

Vibration due to torsional vibrations due to uneven engine operation, especially at low speeds, is effectively eliminated due to the flexible rubber insert. This prestressed rubber element ensures low noise, no play and no vibration when transmitting torque from the engine to the propeller. The Bullflex clutch reliably protects the gearbox from axial and radial impact, ensuring safe transmission of force under any conditions. Another strength of the Bullflex clutch is the immaculate installation of the propeller shaft line. The ideal elimination of the inability of the engine and propeller shaft, their centering even at a fracture angle of 2 ° is possible using the Bullflex coupling (we recommend that you be careful when centering). Thanks to a special centering ring, high shaft revolutions are allowed, both on the front and on the rear, the shaft will be perfectly centered. The non-conical locking hub will allow easy installation and removal of the shaft. Unlike the cone hub, there is no need for the expensive operation of taper shaft machining and keyway cutting. It is only necessary to carefully cut the shaft along the length, degrease and install it.

Bullflex couplings 1, 2 and 4 for connection to the gearbox have holes M10 on the circumference of 82.5 mm (3.25 "). Bullflex couplings 8, 12 and 16 M10 holes on the circumference of 82.5 mm (3.25 ") and 108 mm (4.25").

The Bullflex 32 is equipped with 6 holes M16 on the circumference of Ø 120.65 mm (4.75 "). This allows the Bullflex coupling to be attached to most gearboxes manufactured by Hurth, Velvet, TD, ZF and P.R.M.

The Vetus can provide the necessary mounts to mount the Bullflex on the gearbox. This coupling cannot be used in conjunction with V-Drives.

Example: Initial data: 84 kWatt offshore engine, with a maximum speed of 3.600 rpm and a gear ratio of 2.1: 1.

The shaft speed is calculated as:
3.600/2.1 = 1714 rpm

Then, the transmitted power reduced to 100 rpm will be:
84/17.14 = 4.9kW/100rpm

Bullflex 8 is ideal for a pleasure boat.

In the case of a commercial vessel operating in non-stressed mode, select Bullflex 12. This formula also applies to Uniflex elastic sleeves and to Type 6 elastic sleeves.

Adapter flanges for many gearbox models manufactured by Volvo, Yanmar, Technodrive and Kanzaki can be ordered.

The Bullflex clutch has a built-in axial stop damper, which reduces axial vibration. This means a softer transfer of the abutment to the engine and its supports, which consequently experience a lower load. The result is reduced vibration.

The engine on flexible supports will, by definition, always oscillate. When the propeller shaft is rigidly mounted, i.e. supported by two or more fixed bearings, motor Osculations shall not be transmitted to the propeller shaft.

If this happens, the engine mount, coupling and shaft glands may be damaged. If the shaft is rigidly installed, then you can remove the centering ring from Bullflex coupling. This is necessary if the distance between the gearbox outlet flange and the first shaft support is less than 20 shaft diameters. In this case, the rocking movements of the engine mounted on elastic supports will not be transmitted to the propeller shaft, but will be easily extinguished by the Bullflex clutch. Removal of the centering ring will not affect the vibration pressure characteristic. When the propeller shaft is supported by a single support, Bullflex coupling with installed the centering ring will act as a flexible hinge joint. The propeller shaft will thus be supported and centered within the Bullflex clutch despite engine movements.

• Benefits of the Vetus Bullflex Flexible Coupling:
• Very high elasticity
• optimal vibration suppression
• axial and radial shear warranty
• alignment deviation up to 2 ° is possible, excellent shaft alignment allows high revolutions even at 2 ° deviation
• the shaft will be centered even in the rear stroke
• ability to remove centering ring
• built-in axial load damper
• non-taper locking hub for excellent alignment and ease of installation and removal

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Articles according to the Vetus catalog: BULFL0120, BULFL0125, BULFL0220, BULFL0225, BULFL0425, BULFL0430, BULFL0830, BULFL0835, BULFL0840, BULFL1235, BULFL1240, BULFL1245, BULFL1640, BULFL1645, BULFL1650, BULFL3245, BULFL3250, BULFL3260, BULFL3270