Drive system for driving a component having an electric motor unit and a transmission unit

Patent metadata

Field	Value
Publication number	US-10774925-B2
Application number	US-201716313857-A
Country	US
Kind code	B2
Filing date	Jun 26, 2017
Priority date	Jun 28, 2016
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

An electric motor equipped with a transmission unit in the form of a planetary gear transmission is provided. The planetary gear transmission has a sun gear, planetary gears, and a ring gear, which are coupled to one another via corresponding toothings. The sun gear is coupled directly to a shaft of the electric motor and is fastened thereto. The planetary gears or axles thereof are retained on a bearing plate of the electric motor. The ring gear is rotatably mounted on the housing of the electric motor or is fastened to the housing of the electric motor. A common feature is that parts of the transmission are retained on the housing of the electric motor and not on a separate housing or another component of the transmission unit.

First claim

The invention claimed is:

1. A drive system for driving a component, the drive system comprising:
an electric motor unit configured to provide a rotational movement with a first rotational speed; and
a transmission unit configured to transfer the provided rotational movement to the component with a second rotational speed,
wherein the electric motor unit comprises a housing with at least one bearing plate that is arranged on a first axial end of the housing of the electric motor unit and on which a shaft of the electric motor unit is mounted, the shaft being configured to perform and provide the provided rotational movement,
wherein the transmission unit is a planetary gear transmission comprising:
a first gearwheel that is a sun gear and is connected rotationally conjointly and directly to the shaft of the electric motor unit;
multiple second gearwheels that constitute planetary gears, the multiple second gearwheels being coupled to the first gearwheel such that the multiple second gearwheels co-rotate during rotation of the first gearwheel, the multiple second gearwheels each being held, so as to be rotatable about respective axles, on the housing of the electric motor unit such that respective central points are situated in a distributed manner over a circumference of a circular ring having a central point that lies on an axis of rotation of the first gearwheel and having a surface that is perpendicular to the axis of rotation of the first gearwheel; and
a third gearwheel that is rotatable and constitutes a ring gear of the planetary gear transmission, the third gearwheel being coupled to the multiple second gearwheels such that the third gearwheel co-rotates during rotation of the multiple second gearwheels,

wherein the multiple second gearwheels, for the transfer of the provided rotational movement, are coupleable to the component to be driven,
wherein each of the second gearwheels is held on the housing of the electric motor unit such that a position of the respective second gearwheel on the housing does not change,
wherein the third gearwheel, for the transfer of the provided rotational movement, is coupleable to the component to be driven,
wherein the third gearwheel is rotatably mounted by a bearing device attached to the housing of the electric motor unit, the bearing device having a bearing ring that is arranged so as to surround the housing of the electric motor unit along a circumference of the housing of the electric motor unit.

2. The drive system of claim 1 , wherein the bearing ring is a first bearing ring, and
wherein the bearing device also has a second bearing ring, the first bearing ring and the second bearing ring being positioned spaced apart from one another in an axial direction on the housing of the electric motor unit and so as to surround the housing of the electric motor unit along the circumference of the housing of the electric motor unit.

3. The drive system of claim 1 , wherein at least two axles of the multiple second gearwheels are connected to one another by a ring-shaped support ring, a central point of which lies on the axis of rotation of the third gearwheel and a surface of which is perpendicular to the axis of rotation of the third gearwheel, and
wherein the third gearwheel is mounted rotatably on the support ring.

4. The drive system of claim 1 , wherein the bearing device attached to the housing of the electric motor unit is configured to support not only the ring gear but also the component to be driven.

5. A drive system for driving a component, the drive system comprising:
an electric motor unit configured to provide a rotational movement with a first rotational speed; and
a transmission unit configured to transfer the provided rotational movement to the component with a second rotational speed,
wherein the electric motor unit comprises a housing with at least one bearing plate that is arranged on a first axial end of the housing of the electric motor unit and on which a shaft of the electric motor unit is mounted, the shaft being configured to perform and provide the provided rotational movement,
wherein the transmission unit is a planetary gear transmission comprising:
a first gearwheel that is a sun gear and is connected rotationally conjointly and directly to the shaft of the electric motor unit;
a second gearwheel that constitutes a ring gear and is coupled to the first gearwheel, the second gearwheel being held in a stationary manner on the housing of the electric motor unit; and
multiple third gearwheels that are arranged between the first gearwheel and the second gearwheel, the multiple third gearwheels constituting planetary gears,

wherein the multiple third gearwheels are each arranged on the housing of the electric motor unit such that respective central points are situated in a distributed manner over a circumference of a circular ring having a central point that lies on an axis of rotation of the first gearwheel and having a surface that is perpendicular to the axis of rotation of the first gearwheel,
wherein the multiple third gearwheels are mounted on the housing of the electric motor unit and coupled to the first gearwheel such that the multiple third gearwheels co-rotate about respective axles during rotation of the first gearwheel and such that, at the same time, during rotation of the first gearwheel, respective central points move along the circumference of the circular ring, such that an entirety of the multiple third gearwheels performs a rotational movement that is transmittable to the component, and
wherein the drive system further comprises a guide device provided on the housing of the electric motor unit, ends of the axles of the multiple third gearwheels that face toward the electric motor unit being guidable by the guide device, such that, during rotation of the first gearwheel, the central points of the multiple third gearwheels move along the circumference of the circular ring.

6. The drive system of claim 5 , wherein the guide device has a ring-shaped web that is fastened to the housing of the electric motor unit and has a bearing ring and a holding ring,
wherein the holding ring is mounted on the bearing ring so as to be rotatable about the axis of rotation of the first gearwheel, and
wherein the axles of the further gearwheels are fastened to the holding ring.

7. The drive system of claim 6 , further comprising a transfer device that is fastened to the axles of the multiple third gearwheels, the transfer device being couplable to the component to be driven in order to transmit the rotational movement to the component.

8. The drive system of claim 7 , wherein the holding ring is the transfer device.

Assignees

• Siemens Ag
• Rolls Royce Deutschland Ltd & Co Kg

Inventors

• Loesch Christian
• Anton Frank
• Goraj Robert

Classifications

• F16H57/08 Primary

  of gearings with members having orbital motion · CPC title

• H02K7/116

  with gears · CPC title

• F16H2057/085

  Bearings for orbital gears · CPC title

• F16H57/02

  Gearboxes; Mounting gearing therein · CPC title

• H02K7/1163

  where at least two gears have non-parallel axes without having orbital motion · CPC title