| 摘要 |
According to a first aspect of the invention, a disc brake backing plate (1) comprises a plate having at least one retaining structure (3) defined on a first surface (2) thereof for securing a friction material (10) to the first surface (2). Each retaining structure (3) has at least one nib (6) surrounded by a ridge (5). Each retaining structure (3) includes two diverging nibs (6) projecting out of a circular depression (4) formed in the first surface (2). The ridge (5) surrounds the depression (4). According to a second aspect of the invention, a method of manufacturing the backing plate (1) is disclosed. The method comprises a first step of punching a plate (1) to form a depression (4) within the first surface (2) thereof, the depression (4) having a projection protruding outwardly therefrom. The method comprises a second step of punching the plate (1) to form a ridge (5) surrounding the depression (4). The first surface (2) is punched with a second punching tool (42) to divide the projection (30) into two nibs (6) and to form an annular ridge (5) surrounding the depression (4).
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