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Corrosion resistant motor and gearbox

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article image The EP versions of Bonfiglioli's VF (top) and new W series of worm gearboxes and motors.

BONFIGLIOLI Transmission is introducing new motor and gearbox combinations to cope with the special hygiene and corrosion-resistance needs of processing food, beverages, pharmaceuticals and potentially aggressive solids, liquids and chemicals.

The EP (enhanced protection) versions of Bonfiglioli's W and VF series of worm gearboxes are now complemented by similarly protected versions of its M and BN motors, for installation in close proximity to production and packing processes without the need for screening by cabinets or guards.

Both the motors and gearboxes are manufactured for optimum oil-tightness and ease of washdown of exterior surfaces, with the motors featuring double-dipped, double baked and tropicalised windings, food compatible chemically inert fan, and IP56 (washdown) protection.

Further protection for the motors is provided by life lubricated, double-shielded 2RS bearings, nitrile gasketed terminal box lid, four condensate drains, nitrile gasketed terminal box lids and extra sealing for the motor-gearbox coupling areas of the W-BN combinations.

Motors are available in capacities from 0.12 to 4kW, in compact and IEC types, with two, four and six poles.

The multipurpose W series of gearboxes - available in models from 190Nm to 1000Nm - complements the Bonfiglioli VF worm gearbox range, offering higher torque ratings and enhanced thermal ratings permitting more compact units to be selected for many applications.

Constructed with extensive use of stainless steel for food and liquid contact areas, the EP W Series and smaller VF series gearboxes feature a double two-part epoxy coating with a total thickness of ca. 200μm for enhanced abrasion and corrosion resistance.

The two-part coating, comprising primer and chrome-free and lead-free finish, applied to gearbox or motor and gearbox as required, is formulated to international standards for incidental food contact.

Besides resisting the corrosion of most acid and alkaline substances, the protection is well suited for use with chemical detergents commonly in use.

In accordance with ISO 9223, the coating is also suitable for aggressive environments, being classified C5 in the corrosivity scale.

All gearbox units of the W-EP and VF-EP range feature stainless steel hollow shaft (AISI 316); stainless steel nameplate and most mounting hardware.

They also feature oil seals with stainless steel inner spring; unvented plugs for oil tightness and prevention of lubricant contamination; button plugs for unused mounting holes; and three identification colours in accordance with RAL coding, RAL 9010 (white), 5010 (blue) and 9006 (light grey).

Optional PX oil seals are offered for arduous environments where frequent washdowns occur, often with high-pressure hot water and sanitising agents.

The drives can be factory-filled with food-grade synthetic lubricant (classified UH1 by the USDA) which extends the application range from temperatures of -25°C to 150°C.

All W series drives feature enhanced mounting versatility through having five machined sides, while a new motor spline adaptor permits easier and quicker motor changes.

Ease of installation and replacement is further enhanced by the W series being dimensionally interchangeable with Bonfiglioli's VF/A and VF/V styles, using simple bolt-on KA and KV kits.

Hygiene of the W series is enhanced by through-holes in the casing, which minimise water entrapment, facilitating hosedown cleaning for applications such as food processing, materials handling and packaging.

The W series also has relatively clean lines for a worm reducer, minimising entrapment of food and other particles.

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