| 摘要 |
A disk brake assembly has a housing mounted to a vehicle and a rotor disk mounted to a wheel of the vehicle. Upon expansion of an annular flexible bladder during a brake action, a first brake shoe moves towards the rotor disk and causes the rotor disk to move towards the second brake shoe resulting frictional engagement between the respective brake shoes and the rotor disk. The first brake shoe is deformable under uneven and variable forces resulting from imperfect machining and uneven wearing of the rotor disk. An annular brake pad is attached to first brake shoe using a layer of resilient and deformable material to improve the resilience of the first brake shoe. An annular piston member which protrudes from the first brake shoe to be compressed by the annular flexible bladder is thermally insulated and radially displaceable with respect to the first brake shoe so that the annular piston member is adapted to maintain the original radial position with respect to the annular bladder regardless of radial thermal expansion of the annular rotor disk. Thus, the improved disk brake assembly according to the invention minimizes the local high pressures and temperatures at protruding spots on frictional surfaces of the rotor and makes the brake pad lifetime longer. The improved disk brake assembly also reduces stresses of the bladder and avoids premature aging of the bladder.
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