| 摘要 |
<p>A compound self-energising disc brake has a radially inner pair of pressure plates comprising a driven plate (7) splined to a shaft (5) to be braked and an input plate (9) held from the driven plate by a series of angularly spaced balls (10) received in complementary pairs of recesses (11, 12) in the adjacent faces of the inner plates (7, 9), the balls (10) and recesses (11, 12) providing self-energising camming means between the inner plates. The input plate (9) has a series of splines (24, 27) at its outer peripheral edge upon which a pair of outer friction discs (25, 26) are splined. An outer, primary, pair of pressure plates (30, 31) surround the inner plates (7, 9) and are disposed between the outer friction discs (25, 26). The primary plates (30, 31) also have a series of balls (36) received in recesses (34, 35), the balls (36) and recesses (34, 35) being provided in an anti-servo arrangement so that the actuation force applied to the plates (30, 31) to actuate the primary brake acts in the opposite sense to the drag experienced by the primary plates due to rotation of the outer friction discs (25, 26). Although an anti-servo brake has, on its own, poor performance it is found that when used as the primary brake for a compound brake it has advantages. <IMAGE></p> |
