JP2014141978A - Bearing rotation state measuring monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing rotation state measuring monitoring device which can be reduced in size and weight, and can accurately measure and monitor a rotation state of a bearing which rotates at a high speed (for example, a temperature, strain and vibration of the bearing, the number of revolutions of a rolling body or the like).SOLUTION: A bearing rotation state monitoring device comprises: an outer ring; an inner ring; and a plurality of rolling bodies relatively rotating between the outer ring and the inner ring, and monitors a rotation state of the rolling bearing which rotatably supports a rotating shaft. A flange is arranged at the outer ring or the inner ring, a hole is formed in a region opposing the rolling bodies of the flange in a bearing axial direction, and a measuring sensor composed of a strain gauge is embedded in the hole. By this constitution, there can be obtained an effect that the bearing rotation state can be accurately monitored without being influenced by a bearing external atmosphere or the like.

Description

  The present invention relates to a bearing that supports the main shaft of various rotating machinery devices (e.g., aircraft jet engines and industrial gas turbine engines), and the rotational state of the bearings (e.g., bearing temperature, strain and vibration, or The present invention relates to an improvement in a bearing rotation state measuring and monitoring device (hereinafter referred to as a monitoring device) for measuring and monitoring the number of rotations of rolling elements.

  Conventionally, such jet engines, gas turbine engines, and the like have been provided with a monitoring device for measuring and monitoring the rotational state of a bearing (for example, a ball bearing, a roller bearing, or a slide bearing) that supports the main shaft. As a specific example, a sensor is provided in a hole provided in the bearing inner ring or the outer ring, and measurement of temperature change of the bearing, distortion or vibration, or fluctuation of the rotational speed of the rolling element is performed. As a result, the rotation state of the bearing (the presence or absence of abnormal rotation) is monitored, and damage to the bearing (for example, minute separation of the raceway surface, etc.) is prevented. Safety of jet engines and gas turbine engines is being secured.

  As a sensor in such a monitoring device, for example, a rotational state of the bearing (bearing temperature, strain or vibration) is measured by a thermocouple sensor or the like, and the result is output as an electrical signal (hereinafter referred to as a measurement signal). Then, the measurement signal is transmitted (transmitted) to a predetermined signal processing unit, and the signal processing unit performs arithmetic processing on the amount of change / variation such as the temperature, strain and vibration of the bearing per unit time. The rotation state of the bearing such as temperature transition, strain amount and vibration amount is measured.

  By the way, for example, a bearing that supports a main shaft that rotates at high speed, such as a jet engine or a gas turbine engine, may have a configuration in which inner and outer rings rotate simultaneously, that is, both inner and outer rings may be configured as rotating wheels. In this case, when measuring and monitoring the rotation state of such a bearing, in order to improve the measurement accuracy, a sensor is attached to the rotating body (inner / outer ring, main shaft, etc.), and the measurement signal output from the rotating sensor is subjected to signal processing. It may be necessary to communicate to the part.

  At that time, as a means for transmitting the measurement signal output from the rotating sensor to the signal processing unit, conventionally, a sensor unit 12 including a thermocouple sensor that measures the rotation state of the bearing and outputs the measurement result as an electric signal; The light-emitting element 16 emits light based on the electrical signal output from the sensor unit, thereby converting the electrical signal into an optical signal and outputting the optical signal, and the optical signal emitted by the light-emitting element. The light receiving element 18 receives light, converts the optical signal into an electrical signal, and outputs the electrical signal. The electrical signal output from the second signal conversion unit is received, and calculation processing is performed. A configuration including a control monitoring unit 112 that monitors the rotation state is disclosed as an example. (Patent Document 1)

JP 2009-20013 A

  However, in the above Patent Document 1, if the bearing to be monitored is a flanged bearing, the sensor is disposed at a position farthest from the rolling surface and the saddle surface that is most severely monitored among the bearings. There is a concern that the measurement error of the sensor is likely to occur due to the external thermal environment around the bearing, and the accuracy of the monitoring determination is lowered. Further, when a thermocouple sensor or the like is used as the measuring means of Patent Document 1, there is a concern that it becomes difficult to accurately measure the bearing state due to a change in the thermal environment outside the bearing.

  The present invention has been made in order to solve such a problem, and an object of the present invention is to reduce the size and weight of the bearing and to rotate the bearing rotating at high speed (for example, the temperature, strain and vibration of the bearing). Another object of the present invention is to provide a bearing rotation state measuring and monitoring device capable of measuring and monitoring the rotational speed of rolling elements with high accuracy.

  The invention for solving the above-described problems includes an outer ring, an inner ring, and a plurality of rolling elements between the outer ring and the inner ring that rotate relative to each other, and monitors the rotation state of a rolling bearing that rotatably supports a rotating shaft. A bearing rotation state monitoring device, wherein the outer ring or the inner ring is provided with a flange, a hole facing the rolling element of the flange is provided in the bearing axial direction, A measurement sensor comprising a strain gauge is embedded in

  According to the present invention, since the strain sensor is disposed in the vicinity of the rolling elements and the flange portion, the effect that the bearing rotation state can be monitored with high accuracy without being affected by the bearing external environment or the like can be obtained.

It is a figure which shows the bearing rotation state monitoring apparatus which concerns on this invention. It is a figure which shows the conventional bearing rotation state monitoring apparatus.

  The present invention will be described with reference to FIG. The rolling bearing 1 includes a plurality of cylindrical roller-shaped rolling elements 4 that are located between an inner ring 2, an outer ring 3, the inner ring 2, and the outer ring 3 and relatively rotate the inner ring and the outer ring. The inner ring 2 is provided with flanges 5 at both ends of the rolling element, and the rolling element 4 can be guided and rotated by the inner ring 2.

  Since the rolling bearing 1 is subjected to a large frictional force due to rotation between the flange portion 5 and the rolling element 4 and becomes the most severe condition in the rolling bearing 1, by accurately monitoring the rotation state of the part, The state of the rolling bearing 1 can be grasped. Therefore, by providing a hole 5a facing the rolling element 4 in the flange portion 5 in the bearing axial direction and embedding a measurement sensor 6 made of a strain sensor that is not easily affected by heat in the hole 5a, It becomes possible to monitor the state of the rolling element 4 with high accuracy. The circuit from the measurement sensor 6 to the control monitoring unit (not shown) that monitors the rotation state is the same as that of the conventional configuration as disclosed in Patent Document 1, and thus the description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 ... Rolling bearing 2 ... Inner ring 3 ... Outer ring 4 ... Rolling body 5 ... Eave part 5a ... Hole 6 ... Measurement sensor

Claims (1)

  A bearing rotation state monitoring device for monitoring the rotation state of a rolling bearing that includes an outer ring, an inner ring, and a plurality of rolling elements that are relatively rotated between the outer ring and the inner ring and that rotatably supports a rotating shaft. The outer ring or the inner ring is provided with a flange, a hole facing the rolling element of the flange is provided in the bearing axial direction, and a measurement sensor made of a strain gauge is embedded in the hole. Bearing rotation state monitoring device characterized by that.

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