| 摘要 |
A wedge-actuated drum brake is disclosed which includes the usual pair of brake shoes which are slidably mounted on a fixed support. The customary pair of actuator housings are disposed between adjacent ends of the two shoes. A pair of oppositely acting pistons are slidably disposed in each of the housings. One end of each of the pistons is operably connected to the corresponding ends of the brake shoes. The opposite adjacent ends of the pistons are spread apart by a wedge actuator when the brake is applied. The wedge actuator includes a pair of rollers which are mounted on a guide member for engaging the ends of the piston. The guide member is forced between the pistons by an actuating rod which also carries a wedge-shaped member that is adapted to force the rollers apart. The wedge is pivotally mounted on the actuating rod to permit the wedge to articulate as it is forced between the rollers, thus preventing damage to the wedge, the actuating rod, the rollers, or the guide member.
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