Geared motor, and method for installing a geared motor

Patent metadata

Field	Value
Publication number	US-10458519-B2
Application number	US-201715724565-A
Country	US
Kind code	B2
Filing date	Oct 4, 2017
Priority date	Apr 16, 2015
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A geared motor, comprising a direct current motor having a motor shaft, a planetary gear unit with sun wheels, planetary gears, a ring gear, a gear unit casing, a gear unit output shaft, and pinion cages. A plate axially holds the sun wheels, the planetary gears and the pinion cages in the gear unit casing. The plate has a shaft passage to form a preinstallation module. One of the sun wheels has a central shaft receptacle which is formed with a positive fit contour acting in the rotation direction and coupled in a rotationally fixed manner with the motor shaft via a corresponding positive fit contour; and wherein, in the preinstallation module, an engagement of teeth of one of the sun wheels with teeth of one of the planetary gears is provided both before and after a final installation of the direct current motor at the preinstallation module.

First claim

What is claimed is:

1. A geared motor comprising:
a direct current motor having a motor shaft;
an independent planetary gear unit with a first sun wheel, the planetary gear unit having at least one planetary gear unit stage;
a ring gear having teeth;
first planetary gears engaged with the teeth of the ring gear;
a gear unit casing having an inner circumferential region;
a gear unit output shaft;
a first pinion cage;
a second pinion cage with a secondary sun wheel;
secondary planetary gears secured to the second pinion cage;
a plate positioned within the inner circumferential region independent of the direct current motor, the plate having a sun wheel thrust surface for retaining the first sun wheel in place within the gear casing, the plate having a region for axially retaining the secondary sun wheel, the first and secondary planetary gears and the first and second pinion cages in the gear unit casing, the plate provided with a shaft passage to form a preassembled planetary gear unit; and the first sun wheel having a central shaft receptacle which is formed with a positive fit contour acting in the rotation direction and coupled in a rotationally fixed manner with the motor shaft via a corresponding positive fit contour.

2. The geared motor according to claim 1 , wherein the plate serves not as part of the gear unit casing.

3. The geared motor according to claim 1 , wherein the plate is connected positively with the gear unit casing.

4. The geared motor according to claim 1 , wherein the plate has an outer annular region in which reliefs are provided via which clamping tongues are delimited.

5. The geared motor according to claim 4 , wherein the plate is clamped via the clamping tongues to the inner circumferential region of the gear unit casing.

6. The geared motor according to claim 1 , wherein the sun wheel thrust surface projects axially relative to a radially outwardly adjoining annular surface.

7. The geared motor according to claim 1 , wherein the plate is a flat plate.

8. The geared motor according to claim 1 , wherein the ring gear is of one piece with the gear unit casing.

9. The geared motor according to claim 1 , wherein the inner circumferential area of the gear unit casing is free of teeth and is axially bounded by a stop surface.

10. The geared motor according to claim 1 , wherein the secondary planetary gears are borne on a second pinion cage which has a central bearing clearance and is matched to the diameter of the motor shaft.

11. The geared motor according to claim 1 , wherein the gear unit output shaft is borne in a bearing sleeve formed in one piece with the gear unit casing, and the length of an annular bearing surface is greater than the diameter of the gear unit output shaft.

12. A geared motor comprising:
a direct current motor having a motor shaft;
a planetary gear unit with a first sun wheel, the planetary gear unit having at least one planetary gear unit stage;
a ring gear having teeth;
first planetary gears engaged with the teeth of the ring gear;
a gear unit casing;
a gear unit output shaft; and
a first pinion cage;
a second pinion cage with a secondary sun wheel;
secondary planetary gears secured to the second pinion cage, which has a central bearing clearance and is matched to the diameter of the motor shaft;
a plate for axially holding the first and secondary sun wheels, the first and secondary planetary gears and the first and secondary pinion cages in the gear unit casing, the plate provided with a shaft passage to form a preinstallation module; the first sun wheel having a central shaft receptacle which is formed with a positive fit contour acting in the rotation direction and coupled in a rotationally fixed manner with the motor shaft via a corresponding positive fit contour; and wherein, in the preinstallation module, an engagement of teeth of the first sun wheel with teeth of the first planetary gears is provided both before and after a final installation of the direct current motor at the preinstallation module;
wherein the motor shaft extends beyond the first sun wheel within the bearing clearance of the second pinion cage.

13. The geared motor according to claim 10 , wherein the first pinion cage and a secondary sun wheel are formed as one piece and the secondary sun wheel engages with secondary planetary gears, and the secondary planetary gears engage with the teeth of the ring gear.

14. The geared motor according to claim 13 , wherein the secondary planetary gears are borne on a secondary pinion gear which with the gear unit output shaft are formed as one piece.

15. A method to install a geared motor, made up of a direct current motor having a motor shaft, an independent planetary gear unit with a first sun wheel, a first pinion cage, first planetary gears, a gear unit casing having an inner circumferential region which is formed in one piece with a ring gear, and a gear unit output shaft which is of one piece with a secondary pinion cage, and a plate, the method comprising steps of:
a) providing the gear unit casing, the gear unit output shaft, the first planetary gears, the first sun wheel and the plate;
b) axially installing the gear unit output shaft in the gear unit casing;
c) axially installing the first planetary gears on the first pinion cage and in the ring gear of the gear unit casing;
d) axially installing the first sun wheel in engagement with the first planetary gears;
e) installing the plate within the circumferential region of the gear unit casing independent of the direct current motor, the plate having a sun wheel thrust surface for retaining the first sun wheel in place within the gear casing, and the plate having a region for axially retaining the secondary sun wheel, the first and secondary planetary gears and the first and secondary pinion cages in the gear unit casing, the plate provided with a shaft passage to form a preassembled planetary gear unit;
f) finding the correct angle position between motor shaft and the first sun wheel; and
g) inserting the motor shaft into the first sun wheel, the motor shaft being inserted beyond the first sun wheel into a bearing clearance of the second pinion cage.

16. A method to install a geared motor, made up of a direct current motor having a motor shaft, a planetary gear unit with a first sun wheel, a first pinion cage, first planetary gears, a gear unit casing which is formed in one piece with a ring gear, and a gear unit output shaft which is of one piece with a secondary pinion cage, and a plate, the method comprising steps of:
a) providing the gear unit casing, the gear unit output shaft, the first planetary gears, the first sun wheel and the plate;
b) axially installing the gear unit output shaft in the gear unit casing;
c) axially installing the first planetary gears on the first pinion cage and in the ring gear of the gear unit casing;
d) axially installing the first sun wheel in engagement with the first planetary gears;
e) installing the plate in the gear unit casing;
f) finding the correct angle position between motor shaft and the first sun wheel; and
g) inserting the motor shaft into the first sun wheel, the motor shaft being inserted beyond the first sun wheel into a bearing clearance of the second pinion cage.

17. The method according to claim 16 , wherein the gear unit casing is welded to an adapter or a motor housing.

18. The method according to claim 17 , wherein the gear unit casing is laser-welded to the adapter or the motor housing.

19. The method according to claim 16

Assignees

• Buhler Motor Gmbh

Inventors

• Guttenberger Richard

Classifications

• F16H57/023

  Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly · CPC title

• F16H57/025

  Support of gearboxes, e.g. torque arms, or attachment to other devices · CPC title

• F16H2057/005

  Mounting preassembled units, i.e. using pre-mounted structures to speed up final mounting process · CPC title

• H02K7/116

  with gears · CPC title

• F16H1/46 Primary

  Systems consisting of a plurality of gear trains each with orbital gears, {i.e. systems having three or more central gears} · CPC title