Wireless sensor, rolling bearing with sensor, management apparatus and monitoring system

A rolling bearing with sensor, comprising:

• an outer ring and an inner ring which can rotate relatively to each other, one of said outer and inner rings being a stationary ring while the other is a rotating ring;
• a plurality of rolling elements incorporated between said outer ring and said inner ring;
• and
• a detection sensor unit provided in at least one of said stationary ring, a member attached to said stationary ring, said rotating ring and a member attached to said rotating ring, said detection sensor unit detecting a subject of detection and including at least one of a vibration sensor for detecting vibration, a temperature sensor for detecting temperature, and a rotation speed sensor for detecting rotation speed;
• wherein said detection sensor unit has a communication function for transmitting data to outside by wireless, and
• further wherein a signal output from said detection sensor unit is multiplexed by a multichannel system or a time-sharing system.

A bearing unit with sensor comprising:

• a rolling bearing having at least an outer ring, an inner ring and a plurality of rolling elements, at least one of said outer and inner rings being a rotating ring while the other is a stationary ring;
• an integral-type sensor having at least one of a vibration sensor for detecting vibration, a temperature sensor for detecting temperature, and a rotation speed sensor for detecting rotation speed, and a single sensor holder for including said at least one sensor, said integral-type sensor being attached to one of said stationary ring and a member attached to said stationary ring;
• and
• at least one relay unit provided in the vicinity of one of said integral-type sensor and said bearing, said relay unit transmitting via wireless an output signal from said integral-type sensor to a control unit provided outside said bearing unit, wherein said output signal has been multiplexed by a multichannel system or a time-sharing system.

A wireless sensor for detecting normal condition or abnormality in one of a rolling bearing, a ball screw and a linear guide, comprising:

• a detection unit for detecting a subject of detection;
• a data processing unit for processing data detected by said detection unit;
• and
• a communication unit for transmitting, by wireless, detection data processed by said processing unit, wherein
• said detection unit includes at least one of a vibration sensor for detecting vibration, a temperature sensor for detecting temperature, and a rotation speed sensor for detecting rotation speed, and
• said communication unit transmits, by wireless, said detection data processed by said processing unit together with identification information peculiar to said detection unit.