Safran Transmission Systems

Antoine Mathieu

Benjamin Feraud

Boris Morelli

Maxime Amiet

Boris Pierre Marcel Morelli

Guillaume Julien Beck

Samuel Raymond Germain Becquerelle

Aldric Renaud Gabriel Marie Moreau De Lizoreux

A reduction gear including an input shaft including an input gear, an output shaft including an output gear, and two intermediate transmission lines, each intermediate transmission line including an intermediate shaft including a first stage of teeth and a second stage of teeth, the stages rotating as one, and an additional gear for meshing respectively with the first stage of teeth and the input gear, or with the second stage of teeth and the output gear, and the reduction gear wherein the input gear or the output gear meshing with the additional gears is axially offset with respect to the stage of teeth of the intermediate shafts meshing with the additional gears.

Reduction gear with input/output rotation reversal

A speed reducer includes two intermediate lines for a turboprop engine, the reducer including: an input line including an input shaft bearing an input gear wheel, a first intermediate line including a first intermediate shaft bearing a first intermediate gear wheel, a second intermediate line including a second intermediate shaft bearing a second intermediate gear wheel, a spring held by a frame, the spring surrounding a longitudinal portion of the input shaft in order to allow a movement of the input gear wheel towards an equilibrium position corresponding to an equal distribution of the transmission of the power coming from the input shaft to the first intermediate shaft of the first intermediate line and the second intermediate shaft of the second intermediate line.

Speed reducer with two intermediate lines for a turboprop engine, turboprop engine comprising said reducer

Speed reduction gear comprising two intermediate transmission lines, in particular for a turbine engine, comprising an input line () and an output line that is driven by the input line via said intermediate transmission lines, said intermediate transmission lines being substantially parallel, characterized in that said reduction gear comprises means for distributing loads between said intermediate lines, said load distribution means comprising swiveling coupling means () for rotatably coupling one end of the input line, and oil-damping means () for damping radial movements of an opposite end of the input line.

Speed reduction gear comprising two intermediate transmission lines

A method for manufacturing a propeller reduction gear, which includes measuring manufacturing defects of the casing; calculating a first angular play induced at each intermediate gear by the measured manufacturing defects; estimating a second angular play induced at each intermediate gear by deformations of the casing when the reduction gear transmits a threshold torque; calculating a total angular play from the first angular play and the second angular play; and selecting two intermediate gears with a phase difference that compensates for the total angular play.

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Courbevoie, France

Antoine Mathieu