Impulse RPM sensor esp. for wheel in antilocking regulating system - has pole core and permanent magnet with its magnetic field lines running parallel to longitudinal axis of pole core issuing from sensor housing to pulse transmitter

摘要

A pick-up coil(16) surrounds the pole core(10), at least over a part of its axial length. The pole core(10) and the permanent magnet(14) are arranged coaxially surrounding each other, over at least one section of their axial length. The front endface of the pole core facing the pulse transmitter gear wheel has an axial recess(12), which accepts the permanent magnet(14) leaving at least one radial annular gap(22). The axial recess is a cylindrical bore(12) and the permanent magnet is designed as a solid cylinder. ADVANTAGE - With small external dimensions reliably delivers high signal amplitudes compared to disadvantages of existing sensors e.g. high assembly costs esp. concerning contact and tension relieving of connecting cable.