Abnormality diagnosis system

• US 10,260,991 B2
• Filed: 02/17/2016
• Issued: 04/16/2019
• Est. Priority Date: 02/19/2015
• Status: Active Grant

• Current Assignee: NSK Limited
• Original Assignee: NSK Limited
• Inventors: Yanagisawa, Tomoyuki, Aizawa, Tomoyuki
• Primary Examiner(s): Patel, Harshad R
• Application Number:
  US15/549,544
• Publication Number:
  US 20180038772A1
• Time in Patent Office: 1,154 Days
• Field of Search: 73593, 340682
• CPC Class Codes: F16C 19/52 with devices affected by abnormal or undesired conditions
• CPC Class Codes: G01M 13/04 Bearings
• CPC Class Codes: G01M 13/045 Acoustic or vibration analysis
• CPC Class Codes: G01M 99/00 Subject matter not provided for in other groups of this subclass

Abstract

An abnormality diagnosis system includes a bearing having a plurality of components, a plurality of sensors disposed at different positions of the component and configured to detect surrounding signals, and an abnormality diagnosis device configured to diagnose abnormalities of the rolling bearing and a device disposed around the rolling bearing, based on signals output from the plurality of sensors.

Claims

1. An abnormality diagnosis system comprising:

a bearing that has a plurality of components;

a plurality of sensors that are disposed at different positions of the components; and

an abnormality diagnosis device that is configured to diagnose both of an (i) abnormality of the bearing and (ii) abnormality of a device disposed around the bearing, based on signals output from the plurality of sensors,

wherein the plurality of sensors are of one type including any one of a temperature sensor, a vibration sensor, and a load sensor, and

wherein the device includes a motor and a pump.

2. The abnormality diagnosis system according to claim 1, wherein the components include an inner ring or an outer ring, and

wherein the plurality of sensors comprises:

a first sensor which is disposed in the vicinity of one axial end portion of the inner ring or outer ring of the bearing;

a second sensor which is disposed in the vicinity of a raceway surface of the inner ring or outer ring of the bearing; and

a third sensor which is disposed in the vicinity of the other axial end portion of the inner ring or outer ring of the bearing.

3. The abnormality diagnosis system according to claim 2, wherein the outer ring is a fixed ring.

4. The abnormality diagnosis system according to claim 2, wherein the inner ring is a rotary ring.

5. The abnormality diagnosis system according to claim 1, wherein the abnormality diagnosis device is configured to specify a sensor which output value firstly increases or which output value firstly exceeds a predetermined threshold value, from the plurality of sensors and to determine which of the bearing, motor, and pump is abnormal, based on a position at which the specified sensor is disposed.

6. The abnormality diagnosis system according to claim 1, wherein the plurality of sensors is not disposed on a same circumference.