Rexroth’s Silence Plus external gear pumps represent a new generation of product whose noise level has been reduced by an average of 15 dB(A) compared with a conventional external gear pump. It is suitable for applications with electric motor drives—for example, in lift trucks, lift platforms or industrial power units. Such drives then become significantly quieter in pressure ranges up to 280 bar.
The non-involute helical gearing uses its tooth profile for continuous fluid delivery. This ensures virtually noiseless running of the pump while generating far fewer noise-exciting vibrations in the connected hydraulic system. The internal axial forces generated in the helical gearing are cancelled out in a wear-free manner using hydrostatic bearings. Use of Silence Plus can for example reduce the total noise emission of a standard hydraulic power unit by 11 dB(A). At pressures up to 280 bar the new pump combines increased comfort for the operator along with the high reliability of Rexroth external gear pumps.