| 摘要 |
PURPOSE: A piston seal of a disk brake is provided to reduce the abrasion rate of a brake pad, prevent partial abrasion, and increase return force of a piston using a primary seal and a secondary seal. CONSTITUTION: A piston seal of a disk brake comprises a primary seal(7) and a secondary seal(8). The outer circumference of the primary seal is press-fitted into a seal mounting hole(1a) formed near a disk(11) in a wheel cylinder. The inner circumference of the primary seal is projected to the wheel cylinder and is contacted with the outer surface of a piston(3). The outer circumference of the secondary seal is press-fitted into a seal mounting groove(1b) of a caliper housing(1) positioned inside the wheel cylinder.
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