| 摘要 |
A fixing flange for a speed sensor enables the scanning head to be easily mounted with respect to a tooth disc, said tooth disc being mounted on the wheel hub to provide a unitary structure and the fixing flange is secured to the axle or the kingpin to provide a unitary structure. In one embodiment, the air gap between the magnetic pole pieces carried by the sensor and the outer periphery of the tooth disc is determined by the radius of the toothed disc and the radius of the magnetic pole pieces, the outer periphery of the toothed disc and the outer periphery of the fixing flange being coaxial with respect to the axis of the axle, the sensor being secured to the outer periphery of the fixing flange. In another embodiment, the magnetic pole pieces are covered with a plastic layer having a thickness equal to the desired air gap between the toothed disc and magnetic pole pieces of the sensor. The sensor is mounted to the fixing flange so that the sensor extends therethrough and the plastic layer is in contact with the outer periphery of the toothed disc. During the first rotation, the toothed disc will scrape the plastic layer off of the magnetic pole pieces thereby ensuring the desired air gap. |
