Strength meets efficiency
Brevini has developed a gearbox solution that combines the high efficiency, high reduction ratios and low weight of planetary gear stages with the strength, capacity and durability of bevel helical gears. The Posiplan range of hybrid, shaft-mounted gearboxes boasts a powerful yet light and efficient design which is ideal for medium to large size industrial applications.
Dave Brown, speaking for Brevini UK, comments: "It has long been acknowledged that both bevel helical and planetary gears bring with them certain advantages; at Brevini we are always trying to bring new options to our customers so we set ourselves the challenge of designing a solution that incorporates the strengths of both."
The high power-to-weight properties of Brevini planetary gearing means that the Posiplan gearboxes offer OEM designers a lighter and more compact solution than traditional helical and bevel helical alternatives. A modular design incorporating the flexibility of the Brevini planetary gear range ensure versatility and the ability to engineer solutions according to the application and customer demands, while product lead time and product costs remain extremely competitive. The gearboxes are able to accommodate up to 80,000Nm of torque, and reduction ratios can reach in excess of 1:70,000 (starting at 1:12) thanks to the inclusion of planetary stages. This means that the Posiplan range is suitable for use in applications where medium or low speeds and high torque are required, such as mixers, conveyors and crushers.
Using the hybrid gearboxes in a shaft mounted configuration offers the flexibility of fitment in any orientation and can be used to replace high wearing, and therefore high maintenance, exposed transmission alternatives such as belts, chains and pulleys. It also helps to reduce costs when compared to worm and wheel transmissions; due to the superior efficiency of the Posiplan gearboxes, the demanded input power is reduced in comparison. The units are also lower in weight and production costs making them extremely price competitive.
There are two lines in the Posiplan range, the PH (Planetary Helical) and BPH (Bevel Planetary Helical). The PH offers many benefits over traditional helical gear designs by offering a wide range of reduction ratios within one casing. They offer an ideal solution for space and weight restricted applications. The BPH offers similar levels of performance but incorporates a bevel gear stage to provide a solution with perpendicular input and output shafts.
Both lines deliver long life and high efficiency operation through the specification of high quality and adequately sized bearings. Nitrile (NBR) shaft seals are supplied as standard while alternative seal materials and designs (labyrinth, cassette) are optionally available. Options and accessories are numerous including various output shaft designs, auxiliary drives and backstops as well as a huge number of input adaptations for every conceivable prime mover. The casings are all nodular grade cast iron.
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