Electrical speed sensor

Claim 1

An electrical rotational speed sensor for providing an electrical signal indicative of the rotational speed between a pair of members with one of the members supported for rotation relative to the other, the sensor comprising: a rotor connected to said one of the members for rotation therewith, a stator in magnetic confrontation with the rotor and connected to the other of the members, a shaft connected with the said one of the members supported for rotation relative to the other for transmitting rotation thereto, said shaft carrying a driven gear at one end which is drivingly coupled to a transmission output gear and means for coupling the shaft with the rotor to transmit torsional forces therebetween while permitting radial, axial and angular deflection therebetween, to prevent any deflection of the shaft from being transmitted to the rotor, said last-named means comprising a non-circular outer periphery of said shaft disposed within a correspondingly configured opening in said rotor, said periphery consisting of a plurality of side surfaces joined end-to-end and extending in circumferential directions, independently of radially extending surfaces, to form a continuously circumferentially extending outer periphery.