| 摘要 |
An auto-adjusting mechanism in a disc brake comprising axially movable adjust bolt, adjust nut threaded on adjust bolt, cylindrical piston for transmitting the operating force of a pad-urging-piston to the adjust nut when the piston has moved beyond a predetermined value, spring structure for biasing cylindrical piston toward adjust nut. The cylindrical piston is integrally moved, while the wearing of the brake pads is insignificant, with the piston, but when the wearing has progressed largely, it is abutted on the adjust nut to be separated from the piston, with a result of leaving the thrust force from the spring structure act solely on the adjust nut and rotatingly propelling the nut for compensating the increased brake clearance. And this cylindrical piston is, when the braking fluid pressure in the cylinder body is raised beyond a predetermined value, separated from the adjust nut overcoming the urging force of the spring structure. The over adjustment is prevented in this way.
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