H3-SH28A flender österreich Helical gearboxes H3

Flender/Flender Gear Units/Helical gearboxes H3

CARRIERS conventional planetary idler will often use bearings having outer races pressed into the gear and inner races mounted on apin. These races occupy radial space that decreases the bendingand shear strength of the gear and pin. The challenge has alwaysbeen to design gear and pin with sections that are as smallas possible to reduce cost, and as large as necessary to ain- tain structural performance, and as large necessary to pro vide enough space for bearings. Planet-Pac eliminates this design dilemma by combining the inner races with the planetary pin and the outer races with the planetary gear. An optimized Planet-Pac extracts its advantage by allowing the designer to usethicker gear sections in smaller diameter gears while at thesame time, creating more radial space for larger diameter rollingelements that add to bearing capacity and bearing -1. Studiesshow that increasing the ratio of rim thickness to gear mod-ule, decreasing pin stress in critical bending-shear areas, andincreasing bearing L1 by factor of 2 are all achievable atthe same time. Planet-Pac is perfect solution for improvingthe power density of conventional epicyclical gearing systems. FULL RANGE OF Planet carrier equipped with tapered roller bearing Planet Pac uses full roller complement tapered roller bearing contruction where bearing preload can controlgear contactsDocGearGB1.qxd 2/0/0 1:0 Page 1 BEARING SOLUTIONS 1INTEGRATED FLEXPIN BEARING FOR SINGLE WALLEDPLANETARY CARRIERS High performance epicyclical gear- ing systems inherently place morestress on all the components. Gearstresses are elevated from load andmisalignments created by the tor-sional wind up of the planetary car-rier. The designer might try to solvethe stress problem by increasingface length and using lead correc-tion and gear profiling to manage thestress along the gear tooth. log-ical approach would be to decreaseunit load by increasing the numberof planets to more than 3, but thenit becomes less certain