Planetary gear
AssigneeZF Friedrichshafen AG
InventorsHorst Schulz, Bernd Somschor
Life of this patent
Estimating the term…
Abstract
A planetary gear (1) in the form of a Wolfrom gear with a high transmission ratio. Such gears are preferentially used in handling gear engineering. In order to reduce the number of components required and improve the overall efficiency of the planetary gear, the step wheels (4, 6) of the step planet wheels (5) or the hollow wheels (11, 12) are conically toothed and have opposite conical inclinations. The planet carrier (10) is floating, that is, without a separate bearing. The planetary gear is used especially in industrial robots.
Claims18
A planetary gear set having a first hollow gear (11) and a second hollow gear (12) each having an internal inwardly facing toothed portion, said first hollow gear (11) being fixedly mounted to prevent rotation thereof and said second hollow gear (12) being rotatably mounted, relative to said first hollow gear (11), and forming an output of said planetary gear set, and a plurality of step planets (5) each being mounted on a planetary carrier (10) so at to be in permanent meshing contact with both of said first and second hollow gears (11,12);
- wherein the tooth portion of said first hollow gear (11) is an inclined conical toothed portion and the tooth portion of said second hollow gear (12) is an inclined conical toothed portion, and the inclined conical toothed portion of said second hollow gear (12) is inclined in an opposite direction to the inclination of the inclined conical toothed portion of said first hollow gear (11);
- and
- each of said plurality of step planets (5) has a first inclined tooth gear portion (4) and a second inclined tooth gear portion (6), and an angle of inclination of the first inclined tooth gear portion (4) is inclined in an opposite direction to an angle of inclination of said second inclined tooth gear portion (6), and said first inclined tooth gear portion (4) mates with said inclined conical toothed portion of said first hollow gear (11) and said second inclined tooth gear portion (6) mates with said inclined conical toothed portion of said second hollow gear (12).
Dependencies are inferred from the claim text.