Rolling bearing with sensing unit which can be remotely interrogated

A rolling bearing comprising:

• a first bearing race including a first running surface, a second bearing race including a second running surface, the first and second running surfaces being opposed and spaced apart;
• bearing rolling elements arranged to run between the running surfaces as the races are in relative rotation with respect to each other;
• at least one sensing unit integrated into at least one of the bearing races, a cable connected to the at least one sensing unit, the cable being adapted to transmit changes sensed by the sensing unit and to send the result of the measurement back to a control center after arrival of a control pulse on the cable;
• the sensing unit including at least one component operating on a SAW or a BAW principle and the component being adapted to sense a change in at least one of a dimension and a temperature in the material of the respective one of the races at which the component is disposed, the sensing unit being operable to send the result of the measurement back after arrival of the control pulse.

A rolling bearing comprising

• a first bearing race including a first running surface, a second bearing race including a second running surface, the first and second running surfaces being opposed and spaced apart;
• bearing rolling elements arranged to run between the running surfaces as the races are in relative rotation with respect to each other;
• at least one sensing unit integrated into at least one of the bearing races, the sensing unit including an antenna and the sensing unit being adapted to be interrogated by radio via the antenna;
• at least one component connected with the sensing unit, the component operating on the SAW or BAW principle and the component being operable to send coded identification features that are related to the at least one component back after the arrival of a radio signal via the antenna.

A rolling bearing comprising

• a first bearing race including a first running surface, a second bearing race with a second running surface, the first and second running surfaces being opposed and spaced apart;
• bearing rolling elements arranged to run between the running surfaces as the races are in relative rotation with respect to each other;
• at least one sensing unit integrated into at least one of the bearing races, the sensing unit including an antenna and the sensing unit being adapted to be interrogated by radio via the antenna;
• the sensing unit operating on the SAW or BAW principle;
• an energy supply and an activating unit connected with the sensing unit and being operable under selected conditions of the rolling bearing for activating the sensing unit to cause the sensing unit to emit a radio signal, and an antenna through which the sensing unit emits the radio signal.

A rolling bearing comprising a first bearing race including a first running surface, a second bearing race including a second running surface, the first and second running surfaces being opposed and spaced apart;

• bearing rolling elements arranged to run between the running surfaces as the races are in relative rotation with respect to each other;
• at least one sensing unit integrated into at least one of the bearing races, the sensing unit including an antenna;
• the sensing unit including at least one component operating on a SAW or a BAW principle for determining a measured variable;
• and
• a sensor connected with the sensing unit for sensing and measuring the variable.