| 摘要 |
<p>In self-energising disc brake of the spreading type the recesses (40) in the pressure plates (5, 6) in which the balls (8) are housed, are machined directly into the material of the plates on pitch circles in the two plates of corresponding diameters. Each recess comprises an inclined ramp surface (41) terminating at opposite ends in first and second portions (43, 44) of which the end portion (43) at the deeper end is engaged by the ball (8) in «off» position of brake, and the second portion (44) is engaged by the ball (8) to preclude further relative angular movement between the plates (5, 6) in a brake-applying direction, thereby indicating a «wear stop». In addition ramp surfaces (41, 42) of different slopes may be located between the end portions (43, 44) so that an increased brake-applying effort towards a fully worn lining condition provides a wear warning device.</p> |
