Patent ID: 6547128
Filing Date: 2003-04-15
Classification: G01C

Abstract:
A hub odometer comprising:an eccentric weight rotably supported in a center axis position of an axle hub; a case attached to the axle hub to surround the eccentric weight; a plurality of non-contact measuring mechanisms disposed to measure a number of revolutions in a relative relation to the case and the eccentric weight; and a transponder operative within a range of radio wave frequencies and including a memory for storing measuring data of the plurality of measuring mechanisms, a transmitting circuit for transmitting the data stored in the memory, and a receiver for receiving an interrogation wave from a remote unit, the transmitting circuit being actuated on the basis of the interrogation wave, wherein measuring positions of the plurality of measuring mechanisms are shifted from each other in a hub circumferential direction and rotational direction of a vehicle wheel is detected based upon the measuring data of the plurality of measuring mechanisms.