ISO 4871 Gearbox noise pressure levels
Table 1 lists the noise level behaviour of helical and bevel helical gearboxes in accordance with the power class of the gear. The table values are calculated and indicative, and they can be used for comparison with the noise level of the gearbox during operation.According to the ISO 4871 standard, the emission sound pressure level is to be measured at a distance of 1 metre from the outer surface of the gearbox. Noise level variations due to accessories are not taken into account in the table.
One fan increases the noise level by approx. 3 dB(A). Major deviations from the values must be examined in order to establish the cause of the unusually loud noise.
TABLE 1. Output power / emission sound pressure levels of helical gearboxs and bevel helical gearboxes
|Helical gearboxes||Bevel helical gearboxes|
|Unit output(kW)||Noise level(dBA)||Unit output(kW)||Noise level(dBA)|