| 摘要 |
An automatic brake-adjusting device, and particularly an automatic brake-adjusting device to be used in a trailer, and the device comprises an outer case, a ratchet, a pawl, a pulling bar, a transmission device and an outer lid; the ratchet includes a plurality of first ratchet teeth; the pawl has at least a second ratchet tooth to be engaged with the first ratchet teeth so as to have the ratchet turn in one direction freely. The rotation of the ratchet enables the brake shoe to provide a braking function. When the pulling bar is driven with the brake pneumatic cylinder in a braking direction, the ratchet will be turned slightly in the free rotation direction so as to enable the brake shoe to provide a braking function. As soon as the driving force to the brake pneumatic cylinder is removed, the ratchet will turn backwards slightly to release the braking function. When the brake shoe is worn out to a given condition, the pulling bar will have the ratchet move at a tooth pitch in the free rotation direction so as to have the brake shoe restored to the original brake clearance.
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