Power transmission device and rolling mill

Patent metadata

Field	Value
Publication number	US-11273478-B2
Application number	US-201916637055-A
Country	US
Kind code	B2
Filing date	Jun 7, 2019
Priority date	Jun 7, 2018
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

A power transmission device includes a first power transmission path for transmitting a driving force of a motor to one driven shaft, and a second power transmission path for transmitting the driving force of the motor to another driven shaft. At least one of the first power transmission path or the second power transmission path includes a first intermediate rotor fixed to an output shaft of the motor, a second intermediate rotor rotated by the first intermediate rotor and moving arcuately along an outer circumference of the first intermediate rotor, a driving shaft rotated by the second intermediate rotor and transmitting the driving force to the one driven shaft or the another driven shaft. The driving shaft is configured to move in a direction perpendicular to an axial center direction of the driving shaft in accordance with movement of the second intermediate rotor around the first intermediate rotor.

First claim

The invention claimed is:

1. A power transmission device comprising:
a first power transmission path for transmitting a driving force of a motor to one driven shaft; and
a second power transmission path for transmitting the driving force of the motor to another driven shaft arranged to face the one driven shaft,
wherein at least one of the first power transmission path or the second power transmission path includes:
a first intermediate rotor which has an axial center position fixed to an output shaft of the motor and is rotated by the driving force of the motor;
a second intermediate rotor rotated by the first intermediate rotor and moving along an outer circumference of the first intermediate rotor; and
a driving shaft rotated by the second intermediate rotor and transmitting the driving force to the one driven shaft or the another driven shaft,

wherein the driving shaft is configured to move in a direction perpendicular to an axial center direction of the driving shaft in accordance with movement of the second intermediate rotor around the first intermediate rotor, and
wherein at least one of the first power transmission path or the second power transmission path includes:
at least one pair of first intermediate rotors arranged on one side and the other side across the output shaft of the motor; and
a pair of second intermediate rotors arranged on the one side and the other side across the output shaft of the motor.

2. The power transmission device according to claim 1 , wherein the power transmission device is configured such that a movement trajectory of an axial center of the second intermediate rotor makes a circular arc of a circle centered at an axial center of the first intermediate rotor.

3. The power transmission device according to claim 1 , wherein the pair of first intermediate rotors are arranged symmetrically across the driving shaft, and the pair of second intermediate rotors are arranged symmetrically across the driving shaft.

4. The power transmission device according to claim 3 ,
wherein the driving shaft includes:
a first driving shaft constituting the first power transmission path and moving in a first moving direction in accordance with movement of the second intermediate rotor around the first intermediate rotor of the first power transmission path; and
a second driving shaft constituting the second power transmission path and moving in a second moving direction opposite to the first moving direction in accordance with movement of the second intermediate rotor around the first intermediate rotor of the second power transmission path.

5. The power transmission device according to claim 4 ,
wherein the first driving shaft is configured to move in the first moving direction when the second intermediate rotor of the first power transmission path rotates about the axial center of the first intermediate rotor in one direction of either a clockwise direction or a counterclockwise direction as viewed from the axial center direction, and
wherein the second driving shaft is configured to move in the second moving direction when the second intermediate rotor of the second power transmission path rotates about the axial center of the first intermediate rotor in the other direction of either the clockwise direction or the counterclockwise direction as viewed from the axial center direction.

6. The power transmission device according to claim 5 , wherein the first driving shaft is arranged to be shifted from the second driving shaft in the axial center direction and is arranged so as not to overlap the second driving shaft in a planar view.

7. The power transmission device according to claim 4 , wherein the first driving shaft is arranged to be shifted from the second driving shaft in the axial center direction and is arranged so as not to overlap the second driving shaft in a planar view.

8. The power transmission device according to claim 1 , wherein the first power transmission path and the second power transmission path each include the first intermediate rotor, the second intermediate rotor, and the driving shaft.

9. The power transmission device according to claim 1 , further comprising a link which maintains a constant axial-center distance between the first intermediate rotor and the second intermediate rotor rotated by the first intermediate rotor.

10. The power transmission device according to claim 9 , further comprising a first drive portion which is connected to a point of effort of the link holding the second intermediate rotor at a point of load with an axial center of the first intermediate rotor as a fulcrum, the first drive portion applying a swing force of moving the second intermediate rotor along the outer circumference of the first intermediate rotor such that a movement trajectory of an axial center of the second intermediate rotor makes a circular arc of a circle centered at the axial center of the first intermediate rotor.

11. The power transmission device according to claim 1 , further comprising a second drive portion for moving the driving shaft in the direction perpendicular to the axial center direction.

12. The power transmission device according to claim 1 , wherein the output shaft of the motor, the first intermediate rotor, the second intermediate rotor, and the driving shaft are configured to respectively include gears in outer circumferences thereof and to transmit power by engaging with each other via the gears.

13. The power transmission device according to claim 1 , wherein the output shaft of the motor, the first intermediate rotor, the second intermediate rotor, or the driving shaft includes a roller.

14. A rolling mill comprising:
the power transmission device according to claim 1 ; and
the one driven shaft and the another driven shaft rotated by the driving shaft of the power transmission device,
wherein the one driven shaft and the another driven shaft include a pair of mill rolls having a variable inter-axial distance therebetween.

15. The rolling mill according to claim 14 , further comprising a third drive portion applying power to change the inter-axial distance of the pair of mill rolls,
wherein the pair of mill rolls and the pair of driving shafts are each configured to maintain the same inter-axial distance by causing at least the third drive portion and the drive portion for moving the driving shaft in the direction perpendicular to the axial center direction to work together.

16. A power transmission device comprising:
a first power transmission path for transmitting a driving force of a motor to one driven shaft; and
a second power transmission path for transmitting the driving force of the motor to the another driven shaft arranged to face the one driven shaft,
wherein at least one of the first power transmission path or the second power transmission path includes:
a first intermediate rotor which has an axial center position fixed to an output shaft of the motor and is rotated by the driving force of the motor;
a second intermediate rotor rotated by the first intermediate rotor and moving along an outer circumference of the first intermediate rotor; and
a driving shaft rotated by the second intermediate rotor and transmitting the driving force to the one driven shaft or the another driven shaft,

wherein the driving shaft is configured to move in a direction perpendicular to an axial center direction of the driving shaft in accordance with movement of the second intermediate rotor around the first intermediate rotor, and
wherein the power transmission device further includes:
a link which maintains a

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Umeda Akihiko
• Shoda Katsuhiko
• Nishiura Kensuke
• Otaka Kazuma

Classifications

• F16H1/006

  the driving and driven axes being designed to assume variable positions relative to one another during operation · CPC title

• B21B35/14 Primary

  Couplings, driving spindles, or spindle carriers specially adapted for, or specially arranged in, metal-rolling mills (couplings or shafts in general F16) · CPC title

• B21B35/12

  Toothed-wheel gearings specially adapted for metal-rolling mills; Housings or mountings therefor · CPC title

• F16H1/28

  with gears having orbital motion · CPC title

• B21B35/00

  Drives for metal-rolling mills {, e.g. hydraulic drives} · CPC title