Patent ID: 8753082

Claim:
A multi-stage gear box ( 122 ) of a wind power plant, the gear box ( 122 ) comprising: a gear box housing ( 125 ), wherein at least one access opening for the insertion of a work instrument into the gear box housing ( 125 ), is provided on the outside of the gear box housing ( 125 ) at least one guiding means ( 201 , 202 , 203 , 204 , 205 ) is provided for the work instrument inside the gear box housing ( 125 ) so that the work instrument is moveable and/or positionable within the guiding means ( 201 , 202 , 203 , 204 , 205 ), wherein parts of the gear box ( 122 ) in the gear box housing ( 125 ) are checked and/or worked by means of the work instrument inserted or arranged or arrangeable in the guiding means ( 201 , 202 , 203 , 204 , 205 ) or at least one physical property of oil, in the gear box housing ( 125 ) or physical properties of components of the gear box ( 122 ) are detected, wherein the components include at least one fixed component that is not movable with respect to the gear box housing and at least one moveable component that is moveable with respect to the gear box housing, wherein the guiding means ( 201 , 202 , 203 , 204 , 205 ) includes several guiding means sections that communicate with each other and are aligned or alignable with each other, upon insertion of the work instrument into the guiding means, and wherein the guiding means sections include at least one fixed section that is attached to the at least one fixed component and at least one moveable section that is attached to the at least one moveable component.