| 摘要 |
<p>Brake wear indicator apparatus (30) is of a simple form for attaching as a retro-fit to commercial vehicles not having integrated wear indicator systems. For simplicity and to make the apparatus useful to personnel with mechanical skills who approach and perform checks at each wheel in turn, a control unit (32) is clipped onto the chassis (11) in a convenient manner, such as by a magnet (35), in the vicinity of the braked wheel (28) and connected to a wear sensor (31) disposed in relation to a conventional friction lining (23) rivetted or otherwise fixed to a shoe platform (22). The wear sensor (31) includes a sensor conductor (45) extending for part of the lining thickness and a grounded return conductor (46). When the lining (23) wears the drum (16) bridges the conductors (45,46) or simply grounds the sensor conductor (45) and a circuit is completed in the control unit (32) which provides an indication at the site of the brake affected when the vehicle is parked with brakes applied, ie, under normal inspection conditions. <IMAGE></p> |
