US 2009/0013809 A1Published application

Manual Helical Planetary Transmission and Power Divider for Motor Vehicles Comprising Said Transmission

AssigneeMAGNA Powertrain AG & Co KG

InventorRudolf Glassner

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Abstract

A manual helical planetary transmission comprises a housing, a sun gear, a planet carrier with helical planetary gears and an axially displaceable ring gear which can be coupled to the housing or to the planet carrier. The transmission provides a compact and easy-to-produce solution for locking the gears. For this purpose, first saw-tooth coupling teeth are provided on both sides of the fronts of the ring gear and have a gently sloping first profile. Second saw-tooth coupling teeth provided on the housing and the planet carrier have a gently sloping profile and fit into the first coupling teeth. In the respective gear, the peripheral forces acting upon the ring gear force the gently sloping first profiles of the first coupling teeth against the gently sloping first profiles of the second coupling teeth on the housing or the planet carrier, thereby frictionally keeping the ring gear in the respective engaged position.

Claims14

Dependent claims

A manual helical planetary transmission comprising a housing, a sun gear, a planet carrier with helical planet gears and an axially displaceable annulus gear coupled to the housing or to one of two other members of the planetary transmission, the planetary transmission further comprising:

first coupling teeth arranged at both sides all around end faces of the annulus gear, the first coupling teeth being axially directed and having a sawtooth shape in a section normal to an axis of the annulus gear, and have a gently rising first flank;
second coupling teeth arranged at the housing and at one of the two other members of the planetary transmission, the second coupling teeth being axially directed and having a sawtooth shape in a section normal to the axis of the housing, and have a gently rising first flank fit into the gaps formed by the first coupling teeth;
wherein, in a respective shift ratio, peripheral forces acting on the annulus gear press the gently rising first flanks of the first coupling teeth against the gently rising first flanks of the second coupling teeth at the housing or at the planet carrier and fix the annulus gear in an engaged position.

Dependencies are inferred from the claim text.