Patent ID: 6703734
Filing Date: 2004-03-09
Classification: F16C,H02K

Abstract:
A bearing with a noncontact signal transfer mechanism transmitting a signal from a rotary shaft to a fixed shaft, comprising:a power generation circuit generating power between said rotary shaft and said fixed shaft, said power generation circuit comprising a power feed coil wound around a yoke provided at said fixed shaft, and a power receiving coil wound around a yoke provided at said rotary shaft, wherein a magnetic path is formed between the yoke of said fixed shaft and the yoke of said rotary shaft to provide a current flow to said power receiving coil, a signal transfer circuit configured to be responsive to the power generated by said power generation circuit to transfer a signal from said rotary shaft to said fixed shaft, a power supply circuit for supplying an alternating current to said power feed coil, and a power receiving circuit for receiving said alternating current through said vower receiving coil to rectify the received current for a sensor, wherein said signal transfer circuit comprises a transmission circuit provided at said rotary shaft to transmit a signal by radio waves, and a reception circuit provided at said fixed shaft to receive a signal transmitted from said transmission circuit.