Planetary gear system
A planetary gear system ( 1 ) includes: a sun gear ( 5 ) having external teeth; a plurality of planet gears ( 7 ) having external teeth, each planet gear meshing with the sun gear; a ring gear ( 9 ) having internal teeth, the ring gear meshing with the planet gears; and a baffle unit ( 35 ) disposed between the planet gears which are adjacent to each other, the baffle unit having side faces ( 37 F, 37 R) positioned near the respective planet gears. The baffle unit ( 35 ) has: oil supply holes ( 47 ) which are formed in a tip portion ( 41 ) facing an outer periphery of the sun gear ( 5 ) and which jet out lubricating oil (OL) to mesh positions ( 43, 45 ) between the sun gear and the planet gears; and a collection opening ( 55 ) which is formed in at least one of the side faces and through which the lubricating oil (OL) that has been jetted out is collected into the baffle unit ( 35 ).
1. A planetary gear system comprising:
a sun gear having external teeth;
a plurality of planet gears having external teeth, each planet gear meshing with the sun gear;
a ring gear having internal teeth, the ring gear meshing with the planet gears; and
a baffle unit disposed between the planet gears which are adjacent to each other, the baffle unit having side faces positioned near outer peripheries of the respective planet gears, wherein
the baffle unit has:
oil supply holes which are formed in a tip portion facing an outer periphery of the sun gear and which jet out lubricating oil to mesh positions between the sun gear and the planet gears; and
a collection opening which is formed in at least one of the side faces and through which the lubricating oil that has been jetted out is collected into the baffle unit.
2. The planetary gear system according to claim 1 , wherein each planet gear is a double helical gear having an annular groove formed at an outer circumferential face of an axially central portion of the double helical gear.
3. The planetary gear system according to claim 1 , wherein a guide piece which guides the lubricating oil to the collection opening is formed at the at least one of the side faces of the baffle unit.
4. The planetary gear system according to claim 1 , wherein the baffle unit has a ring gear oil supply hole formed therein, through which the collected lubricating oil is supplied to the ring gear.
5. The planetary gear system according to claim 1 , wherein the baffle unit has an outlet formed therein, through which the collected lubricating oil is discharged in an axial direction.
6. The planetary gear system according to claim 5 , wherein the baffle unit includes a weir, which blocks the outlet at a radially outer side of the planet gears and at a backward side with respect to a revolution direction of the planet gears.
7. The planetary gear system according to claim 1 , wherein a collection guide groove which guides the lubricating oil to the collection opening is formed so as to extend from an inner end of the at least one of the side faces of the baffle unit to the collection opening.