Bosch Rexroth Offers Cyclone Hydraulic Oil Tanks

Bosch Rexroth has introduced steel cyclone hydraulic oil tanks with a robust design specifically developed for on-vehicle rail applications. The tanks are said to occupy far less space than their plastic counterparts. The tank design means efficient and reliable operation of hydrostatic fan or alternator drive systems can be achieved with smaller volumes of oil. Fabricated from 3mm steel, the tanks have a two-layer corrosion-resistant coating to ensure durability in demanding conditions.

They are approved for use on many of Europe's rail networks. As well as standard versions, the tanks can also be supplied in special versions for use in military vehicle applications. The high flow rates associated with modern hydrostatic systems frequently means that the oil used becomes aerated. The conventional solution is to employ a large reservoir tank that allows the oil to de-aerate by circulating slowly. Tanks of this type occupy valuable space on the vehicle, however, and the arrangement only works efficiently if a large volume of oil is available.

The cyclonic internal configuration of the Rexroth tanks is said to eliminate these problems by directing the oil along a helical path, which provides faster and more effective de-aeration. This means that smaller tanks and less oil can be used. Standard cyclone tanks from Rexroth have a total volume of 28 litres, a fill volume of 21.5 litres and are 354mm in diameter by 376mm high. They are available for use at flow rates up to 250 litre/min and pressures up to 2.5 bar and have an operating temperature range of -30C to 90C.

More compact tanks are available in polymer (six litre) and steel (eight litre) to suit smaller applications. The tanks have an integral breather and are fitted with a visual oil level indicator as well as a level sensor that can be used to initiate automatic shutdown of the hydrostatic installation in the event of oil loss.

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