| 摘要 |
An improved drum brake includes a drum having an outer generally cylindrical circumferential wall having an inner braking surface and a side wall plate mounted on and extending between the inner side of the outer circumferential wall. A braking mechanism mounted within the drum includes at least one brake shoe having an arcuate brake pad mounted thereon and brake actuating means operative to force the arcuate brake pad into frictional contact with the inner braking surface. At least two diagonal grooves are formed in the inner braking surface of the outer circumferential wall, each of the at least two diagonal grooves having a generally V-shaped or U-shaped cross-sectional shape and extending substantially across the entire width of the outer circumferential wall to remove liquid from within the drum being forced rearwards and outwards out of the drum within the diagonal grooves due to the rotation of the drum.
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