DE 3439225 A UPAB: 19930922 A power-driven tool comprises a drive motor and gearbox. At least one chamber is provided in the wall of the gearbox to permit pressure-balancing between the interior and the external atmosphere. In the preferred embodiment, the pressure -balancing chamber contains a diaphragm, esp. of an elastic, heat-resistant material impermeable to air and lubricant. The outer opening of the pressure-balancing chamber is pref. closed by an air-permeable filter, more specifically of a sintered material. USE/ADVANTAGE - As a power-driven tool. The variations in pressure within the gearbox space due to temp. changes, etc. are not applied to the bearings of the shafts, but are balanced out by the pressure-balancing chamber.
Getriebegehaeuse mit Druckausgleich
1986
Patentblatt, Vol.106 (1986), No.19
Patent
Electronic Resource
German
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