Spur gear planetary gearing with load balance

Claim 1

In a spur gear planetary gearing arrangement with a load balance having a sun gear supported on plural planetary gears and being in toothed engagement therewith, which planetary gears in turn are in toothed engagement with an internally toothed ring gear mounted in and connected to a gear box housing, said planetary gears being rotatably supported in a planetary carrier, the improvement comprising wherein said ring gear has an internally toothed inner portion and an outer portion radially outwardly spaced therefrom and means intermediate said inner and outer portions for facilitating a relative elastically deformable movement between said inner and outer portions and to a specific degree approximately equal with the radial elasticity of its tooth system and independent from the connection of said ring gear to said gear box housing, wherein said inner portion of said ring gear is an internally toothed inner ring and said outer portion is an outer ring, wherein said intermediate means includes an at least approximately disk-shaped web connecting said radially inner and outer rings, wherein at least one of said outer ring and said inner ring are designed and dimensioned such that each ring can be deformed elastically under a load without substantially deforming the other ring due to the presence of said web, and wherein said outer ring has a lesser thickness over a substantial part of its width than at its end sections.