| 摘要 |
This invention relates to a brake lining clearance adjusting device capable of being used in drum brakes and disc brakes. Compared with existing adjusting devices, the present adjusting device saves space, is less expensive to manufacture and has an easy operating motion. The torque of the back rotation after adjustment does not change the adjustment made. An adjusting spindle which has one end thereof secured to a piston has an adjusting nut threaded thereon, the piston, spindle and nut being disposed coaxially of the longitudinal axis of a cylinder. The first piston has extending therefrom a cylindrical projection which is disposed coaxially of the longitudinal axis and spaced from the inner surface of the cylinder with its end remote from the first piston slidably engaging the inner surface of the cylinder. The cylindrical projection includes a guideway therethrough having a first portion which is included at a given angle with respect to the longitudinal axis. A catch ring is disposed coaxially of the adjusting nut and in a sliding relation with the inner surface of the cylindrical projection and includes thereon a guide pin engaging the guideway. One end of the catch ring is spaced from a conical portion of the adjusting nut by an amount equal to the desired brake lining clearance. A friction ring is disposed coaxially of the adjusting nut in contact with the other end of the catch ring and in a friction contact with the inner surface of the cylindrical projection. During an adjusting step the end of the catch ring frictionally engages the conical portion of the adjusting nut and through means of the guideway causes rotation of the nut with respect to the spindle to provide the desired adjustment. The friction ring, after an adjustment is made, cooperates in preventing rotation of the adjusting nut to prevent any change in the adjustment made. |
