| 摘要 |
PROBLEM TO BE SOLVED: To reduce the squeak of which the rate of generation is increased when the past history and abrasion of a frictional material are advanced to some degree, by mounting an inner hole extended in parallel with a surface of the frictional material, under the surface slidably contacted with a counter rotor of the frictional material. SOLUTION: A brake pad 1 is formed by a steel iron back plate 2 and a frictional material 3 integrally bonded to the back plate 2. The frictional material is provided with an inner hole 4 extended at an inner peripheral side and an outer peripheral side in parallel with a surface of the frictional material 3 at a central position of the back plate 2. The inner hole 4 is a thorugh hole penetrating through an inner peripheral end surface and an outer peripheral end surface of the frictional material 3. A diameter of the inner hole 4 is preferably within a range of 1/4 through 1/3 of a thickness of the frictional material 3. By applying this structure, the braking squeak reduction effect can be obtained by a reiriforcement material and the blending of a friction adjusting agent in an initial period of the use of the frictional material 3. When the abrasion is advanced over the upper depth of the inner hole 4, and the inner hole 4 is exposed to the surface, the squeak reduction effect similar as that obtained when a groove is formed on the surface of the frictional material 3 can be obtained.
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