Patent ID: 7753817

Claim:
A planetary gear arrangement having one or more planetary stages, a first stage of said planetary stages comprising: a planet wheel carrier having planet wheels with coggings; a rotatable shaft connected to said planet wheel carrier; an internal gear disposed coaxially relative to said planet wheel carrier; a centrally located sun wheel having cogging and from which power is transmitted to a next stage or out, said coggings of said planet wheels operatively engaging said internal gear and said cogging of said sun wheel; a frame supporting said first stage through said internal gear and causing load-induced deflection of said rotatable shaft; and an oil supply connection between said frame and said planet wheel carrier, said oil supply connection including: a first connecting element related to the frame; an opposite second connecting element related to said planet wheel carrier; a groove in one of said connecting elements; a supply unit arranged against said groove in said opposite connecting element; and annular seals on both sides of said groove; said supply unit being surrounded by a first set of ring seals including first inner and outer ring seals defining an annular seal coaxially inside and outside thereof, said groove being confined by a second set of ring seals including second inner and outer ring seals defining another annular seal coaxially inside and outside thereof, and said first and second inner ring seals and correspondingly said first and second outer ring seals being adapted as pairs to slide against each other; one of said first and second sets of ring seals being supported by spring elements for allowing deflection between said connecting elements; wherein said oil supply connection is arranged to deliver lubrication and permit rotation during small deflections of said first stage.