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US 12,603,555 B2Granted
Drive unit with stator, rotor, and planetary gear set
AssigneeRimac Technology LLC
InventorDominik Padovan
Life of this patent
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Abstract
Disclosed is a drive unit. The drive unit comprises a housing, a stator, a rotor, a planetary gear set, and an interface system. The rotor comprises a rotor shaft rotatable around a rotation axis and a sun gear coupled to said rotor shaft. The planetary gear set comprises a ring gear fixed to said housing, a plurality of planet gears in meshing engagement between the sun gear and the ring gear, and a planet carrier supporting them. Furthermore, the planet carrier comprises an axial protrusion developing along the rotation axis and defining a gear shaft concentric to the rotor shaft. The interface system interfaces the rotor with the planetary gear set and comprise at least one support bearing interposed between the rotor shaft and the gear shaft.
Claims13
A drive unit, comprising:
- a housing;
- a stator lodged inside the housing;
- a rotor inserted in the housing inside the stator and comprising a rotor shaft rotatable around a rotation axis and a sun gear coupled to the rotor shaft;
- a planetary gear set placed inside the housing, comprising a ring gear fixed to the housing, a plurality of planet gears in meshing engagement between the sun gear and the ring gear, and a planet carrier supporting the plurality of planet gears, the planet carrier comprising an axial protrusion developing along the rotation axis and defining a gear shaft concentric to the rotor shaft;
- and
- an interface system configured to interface the rotor with the planetary gear set and comprising at least one support bearing interposed between the rotor shaft and the gear shaft,
- wherein the interface system comprises a support blocking element applied to the least one support bearing and configured to prevent axial movement of the at least one support bearing;
- wherein the planet carrier presents a first side and a second side, the axial protrusion developing from the first side and the planet carrier comprising an annular abutment portion developing from the second side and concentric to the rotor shaft, and the interface system comprises an auxiliary bearing interposed between the rotor shaft and the annular abutment portion;
- wherein the interface system comprises at least one pressure element coupled to the rotor shaft and configured to apply an axial load by direct contact on at least one of the support bearing or the auxiliary bearing;
- wherein the least one pressure element is configured to apply an axial load on the support bearing that is transmitted to the auxiliary bearing through the planet carrier, or the at least one pressure element is configured to apply an axial load on the auxiliary bearing that is transmitted to the support bearing through the planet carrier;
- and
- wherein the rotor shaft has a threaded section, and the least one pressure element presents a corresponding threaded portion screwable to the threaded section.
9 more elements
A motor, comprising:
- a housing;
- a first stator lodged inside the housing;
- a first rotor inserted in the housing inside the first stator and comprising a first rotor shaft rotatable around a rotation axis and a first sun gear coupled to the first rotor shaft;
- a first planetary gear set placed inside the housing, comprising a first ring gear fixed to the housing, a plurality of first planet gears in meshing engagement between the first sun gear and the first ring gear, and a first planet carrier supporting the plurality of first planet gears, the first planet carrier comprising an axial protrusion developing along the rotation axis and defining a first gear shaft concentric to the first rotor shaft;
- a first support bearing interposed between the first rotor shaft and the first gear shaft, and a first support blocking element applied to the first support bearing and configured to prevent axial movement of the first support bearing;
- a second stator lodged inside the housing;
- a second rotor inserted in the housing inside the second stator and comprising a second rotor shaft rotatable around a rotation axis and a second sun gear coupled to the second rotor shaft;
- a second planetary gear set placed inside the housing, comprising a second ring gear fixed to the housing, a plurality of second planet gears in meshing engagement between the second sun gear and the second ring gear, and a second planet carrier supporting the plurality of second planet gears, the second planet carrier comprising an axial protrusion developing along the rotation axis and defining a second gear shaft concentric to the second rotor shaft;
- and
- a second support bearing interposed between the second rotor shaft and the second gear shaft, and a second support blocking element applied to the second support bearing and configured to prevent axial movement of the second support bearing;
- wherein the first gear shaft is coaxial with the second gear shaft and faced outward in opposite directions.
8 more elements
Dependencies are inferred from the claim text.