| 摘要 |
An internal shoe drum brake has a pair of brake shoes mounted on a backplate with one pair of adjacent shoe ends in sliding engagement with an abutment fixed to or integral with the backplate. An actuator disposed between the other pair of adjacent shoe ends is operable to move the shoes, in use, into braking engagement with the braking surface of the rotary brake drum. At least the actuator or abutment is provided with shoe tip engagement surfaces of arcuate form and the respective engaging shoe tips have a generally complementary arcuate form resulting in a generally even wear pattern for the shoes.
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