Back to results
US 5,910,066 AGranted
Planetary gear
AssigneeZF Friedrichshafen AG
InventorsHorst Schulz, Bernd Somschor
Life of this patent
Estimating the term…
Abstract
A planetary gear having step planet gears is generically a Wolfrom gear which permits large ratios. Transmission of this type are used mainly in the handling technology. In order to improve the portability, friction, vibration and noise characteristics, step planet gears with separate toothed regions of the step gears are used. The modules of the step gears are graduated. The number of teeth is identical. Each of the teeth engagements with the ring gears can be optimized. The teeth on the step gears are preferably honed.
Claims14
A planetary gear arrangement (1) comprising:
- a shaft driving a sun gear (3) with external teeth;
- and
- a first ring gear (11) with radially inwardly extending teeth and an adjacent second ring gear (12) with radially inwardly extending teeth;
- wherein said first ring gear (11) is fixedly mounted and said second ring gear (12) is rotatably mounted and forms an output of said planetary gear;
- and
- a plurality of planets (5, 26), with external teeth, are each supported by a planet carrier (10) upon a rotatable axle (7), and said external teeth of said plurality of planets (5) having a constant meshing engagement with said teeth of said sun gear (3) and said teeth of said first and second ring gears (11, 12), said plurality of planets (5, 26) are each step gears which have a small step gear (6) and a large step gear (4);
- and said small gear (6) and said large step gear (4) each have the same number of teeth and the same relative orientation of the teeth, but the teeth of the small step gear (6) having a different tooth module from the teeth of the large step gear (4) for all of said plurality of planets (5) forming said planetary gear arrangement.
4 more elements
A planetary gear arrangement (1) comprising:
- a shaft driving a sun gear (3) with external teeth;
- and
- a first ring gear (11) with radially inwardly extending teeth and second ring gear (12) with radially inwardly extending teeth;
- wherein said first ring gear (11) is fixedly mounted and said second ring gear (12) is rotatably mounted and forms an output of said planetary gear;
- and
- a plurality of planets (5, 26), with external teeth, are each supported by a planet carrier (10) upon a rotatable axle (7), each said axle (7) is supported on said planet carrier (10) by a pair of bearings to facilitate rotation thereof, said external teeth of said plurality of planets (5) have a constant meshing engagement with said teeth of said sun gear (3) and said teeth of said first and second ring gears (11, 12), said plurality of planets (5, 26) are each step gears which have a small step gear (6) and a large step gear (4);
- and said small and said large step gears (4, 6) each have the same number of teeth and the same relative orientation of the teeth, but the teeth of the small step gear (6) have a different tooth module from the teeth of the large step gear (4) for all of said plurality of planets (5) of said planetary gear arrangement, and said small and said large step gears (4, 6) are offset from one another by an axial gap (25).
4 more elements
A planetary gear arrangement (1) comprising:
- a shaft driving a sun gear (3) with external teeth;
- and
- a first ring gear (11) with radially inwardly extending teeth and an adjacent second ring gear (12) with radially inwardly extending teeth;
- wherein said first ring gear (11) is fixedly mounted and said second ring gear (12) is rotatably mounted and forms an output of said planetary gear;
- and
- a plurality of planets (5, 26), with external teeth, are each supported by a planet carrier (10) upon a rotatable axle (7), and said external teeth of said plurality of planets (5) have a constant meshing engagement with said teeth of said sun gear (3) and said teeth of said first and second ring gears (11, 12), said plurality of planets (5, 26) are each step gears which have a small step gear (6) and a large step gear (4);
- and said small step gear (6) and said large step gear (4) each having the same number of teeth but the teeth of the small step gear (6) having a different tooth module from the teeth of the large step gear (4);
- and
- said planet carrier (10) is driven via a spur gear set with an input shaft offset in parallel relative to a main axle of a transmission accommodating said planetary gear arrangement.
6 more elements
Dependencies are inferred from the claim text.