Planetary gear
Assignee2F Friedrichshafen AG
InventorsHorst Schulz, Jürgen Pescheck
Life of this patent
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Abstract
The planetary gear according to the invention comprises a sun gear (2) connected to a driven central shaft (20), a ring gear (12), a group of first stepped planetary gears (8, 10) and a group of second stepped planetary gears (4, 6). The large step wheels (4) of the second stepped planetary gears engage the sun gear (2), the small step wheels (6) of the second stepped planetary gears simultaneously engage a pair of adjoining large step wheels (8) of the first stepped planetary gears and all small step wheels (10) of the first stepped planetary gears engage the ring gear (12). The gear allows for high transmission ratios having a small size and low inertia moment and offers excellent properties in relation to efficiency and transmission reliability.
Claims34
The planetary gear having a sun gear (2) connected with a driven central shaft (20) defining an axis (44), a ring gear (12), a group of first stepped planetary gears (8, 10) each having a large and a small gear, a group of second stepped planetary gears (4, 6) each having a large and a small gear wherein all stepped planetary gears are supported in a common planet carrier (24), the number of the second stepped planetary gears (4, 6) corresponding to a half the number of the first stepped planetary gears (8, 10), the large gears (4) of said second stepped planetary gears engage said sun gear (2), the small gears (6) of said second stepped planetary gears engage simultaneously one pair of adjacent large gears (8) of said first stepped planetary gears, all small gears (10) of said first stepped planetary gears engage said ring gear (12), said planet carrier (24) being a supporting element for said first and second stepped planetary gears (4, 6, 8, 10) and said ring gear (12) being an output gear.
Dependencies are inferred from the claim text.