Fractal structure for power-generation of bearing rotating vibration

Patent metadata

Field	Value
Publication number	US-11525477-B2
Application number	US-201916714794-A
Country	US
Kind code	B2
Filing date	Dec 16, 2019
Priority date	Dec 21, 2018
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

Provided is a fractal structure for power-generation of bearing rotating vibration that is installed on an outer ring of a bearing to generate power using vibration generated from a micro whirling motion of the bearing, the fractal structure including a housing which is in contact with the outer ring of the bearing to receive the vibration generated from the micro whirling motion of the bearing, and has a receiving space therein, a flexible element which is disposed in the receiving space while being in contact with an inner circumference of the housing to convert the vibration into a radial direction, and a piezoelectric element which is installed between the housing and the flexible element and disposed near the receiving space, and deforms upon receiving the vibration converted in the radial direction from the flexible element, thereby producing electricity.

First claim

What is claimed is:

1. A fractal structure for power-generation of bearing rotating vibration that is installed on an outer ring of a bearing to generate power using vibration generated from a micro whirling motion of the bearing, the fractal structure comprising:
a housing which is in contact with the outer ring of the bearing to receive the vibration generated from the micro whirling motion of the bearing, and has a receiving space therein;
a flexible element which is disposed in the receiving space while being in contact with an inner circumference of the housing to convert the vibration into a radial direction; and
at least one piezoelectric element which is installed between the housing and the flexible element and disposed near the receiving space, and deforms upon receiving the vibration converted in the radial direction from the flexible element, thereby producing electricity.

2. The fractal structure according to claim 1 , wherein the flexible element comprises:
a first element which is formed in an arc shape and installed in the piezoelectric element with two ends being connected to one surface of the housing; and
a second element which is formed in an arc shape and disposed in contact between the first element and the other a second surface of the housing.

3. The fractal structure according to claim 1 , wherein a plurality of piezoelectric elements is provided, and the plurality of piezoelectric elements is arranged in the housing, spaced apart from each other,
a plurality of first elements is provided, and the plurality of first elements is spaced apart from each other and has two ends each installed in the plurality of piezoelectric elements, and
a plurality of second elements is provided, and the plurality of second elements has two ends in contact with adjacent first elements.

4. The fractal structure according to claim 2 , wherein two ends of the second element are in contact with a part between two ends of the first element, and a part between the two ends of the second element is in contact with the other surface of the housing.

5. The fractal structure according to claim 4 , wherein the receiving space is formed along a circumferential direction, and
the first and second elements are repeatedly arranged in the circumferential direction within the receiving space.

6. The fractal structure according to claim 4 , wherein the receiving space is formed along the circumferential direction, and
the first and second elements are arranged in the circumferential direction and a direction perpendicular to the circumferential direction within the receiving space.

7. The fractal structure according to claim 2 , wherein an outer ring of the housing has a step in which the first element gets stuck in one surface of the outer ring, and the first element has a piezoelectric support at an end, wherein the piezoelectric support gets stuck in the step and extends in a tangential direction to support the piezoelectric element.

8. The fractal structure according to claim 1 , wherein the piezoelectric element is electrically connected to a vibration detection sensor which detects the vibration of the bearing, and the vibration detection sensor allows self-power generation upon receiving the electricity produced from the piezoelectric element.

Assignees

• Korea Inst Sci & Tech

Inventors

• Lee Yong Bok
• Kwak Wonil
• Choe Bok Seong
• Kim Jungwan

Classifications

• H02K5/24 Primary

  specially adapted for suppression or reduction of noise or vibrations · CPC title

• H02N2/18

  producing electrical output from mechanical input, e.g. generators (for measurement devices G01) · CPC title

• G01M13/045 Primary

  Acoustic or vibration analysis · CPC title

• F16C27/04 Primary

  Ball or roller bearings, e.g. with resilient rolling bodies · CPC title

• F16C27/066

  Ball or roller bearings · CPC title