Abstract: A system for reducing teeth power losses in a gearbox, including at least two intermeshing toothed gears, each attached to a rotating shaft supported by bearings and mounted within a housing. Two vertical plates are configured for being installed inside the housing between the bearings and the toothed gears, one at each side of the toothed gears. The vertical plates comprise one or several internal shields configured for separating oil flows within the housing; mounted on the side of the vertical plates directed towards the toothed gears. The internal shield includes an anti-recirculation plate. At least one anti-recirculation plate comprises one or several vertical fins for breaking an axial flow of an air-oil mixture.

Abstract: A hydrodynamic bearing contains a body of which an inner surface forms a cavity arranged to accommodate and surround a rotary shaft. The cavity has a plurality of pads installed on the inner surface so as to support and guide the rotary shaft in rotation in a direction of rotation w from “upstream” to “downstream”. Each pad has an upper surface of which one portion, referred to as the “active surface”, acts as a sliding surface for the rotary shaft. The bearing having at least one pad included in an active angular sector of the bearing and at least one pad included in a passive angular sector of the bearing such that the active surface of each pad of the passive angular sector is lower than the active surface of each of the pads of the active angular sector.

Abstract: A hydrodynamic bearing includes an annular inner surface surrounding a rotary shaft to support and guide rotation thereof about the longitudinal rotation axis thereof in an upstream to downstream rotation direction. The inner surface includes an orifice for supplying lubricant and first and second discharge recesses distributed on either side of the supply orifice according to the width of the bearing. The first discharge recess opens into a first side groove and the second discharge recess opens into a second side groove. The first and second side grooves extend along a portion of the circumference of the bearing on lateral sides of the inner surface of the bearing, from the respective first and second discharge recesses towards a third discharge recess located downstream of the two recesses, to direct the lubricant collected by the first and second discharge recesses towards the third recess to be discharged outside the bearing.

Abstract: A hydrodynamic bearing contains a body of which an inner surface forms a cavity arranged to accommodate and surround a rotary shaft. The cavity has a plurality of pads installed on the inner surface so as to support and guide the rotary shaft in rotation in a direction of rotation w from “upstream” to “downstream”. Each pad has an upper surface of which one portion, referred to as the “active surface”, acts as a sliding surface for the rotary shaft. The bearing having at least one pad included in an active angular sector of the bearing and at least one pad included in a passive angular sector of the bearing such that the active surface of each pad of the passive angular sector is lower than the active surface of each of the pads of the active angular sector.

Abstract: A hydrodynamic bearing includes an annular inner surface surrounding a rotary shaft to support and guide rotation thereof about the longitudinal rotation axis thereof in an upstream to downstream rotation direction. The inner surface includes an orifice for supplying lubricant and first and second discharge recesses distributed on either side of the supply orifice according to the width of the bearing. The first discharge recess opens into a first side groove and the second discharge recess opens into a second side groove. The first and second side grooves extend along a portion of the circumference of the bearing on lateral sides of the inner surface of the bearing, from the respective first and second discharge recesses towards a third discharge recess located downstream of the two recesses, to direct the lubricant collected by the first and second discharge recesses towards the third recess to be discharged outside the bearing.

Abstract: An epicyclic gear system has a sun gear, a ring gear, and planet gears between the sun and ring gears. In addition, it has a carrier including a carrier flange offset axially from the planet gears and carrier pins that project from the flange into the planet gears, each with a shank anchored to the flange, a head remote from the flange, and a groove between the shank and head. Between the planet gears and the carrier pins are bearings, each including an inner race and rollers between the inner race and planet gear. Whereas the carrier pins are cantilevered from the carrier flange, the inner races are cantilevered from the heads of the carrier pins. The grooves in the pins enhance pin deflection, so that the axes about which the planet gears rotate remain parallel to the central axis of the system.

Abstract: An epicyclic gear system has a sun gear, a ring gear, and planet gears between the sun and ring gears. In addition, it has a carrier including a carrier flange offset axially from the planet gears and carrier pins that project from the flange into the planet gears, each with a shank anchored to the flange, a head remote from the flange, and a groove between the shank and head. Between the planet gears and the carrier pins are bearings, each including an inner race and rollers between the inner race and planet gear. Whereas the carrier pins are cantilevered from the carrier flange, the inner races are cantilevered from the heads of the carrier pins. The grooves in the pins enhance pin deflection, so that the axes about which the planet gears rotate remain parallel to the central axis of the system.