| 摘要 |
A disk brake including: a brake pad; a piston (17); a cylinder bore (13); an annular sealing groove (15) formed on the cylinder bore (13); and a rectangular piston seal (16) fitted into the sealing groove (15) sealing between the piston (17) and the cylinder bore (13), wherein the sealing groove (15) includes: a bottom surface portion (15A) inclined as the sealing groove (15) expands its diameter; a lateral surface portion (15B) that extends from one end of the bottom surface portion (15A), the one end being a side where the sealing groove (15) has the maximum diameter; and a chamfered portion (19), and wherein an inclined angle of the bottom surface portion (15A) is 2 to 8 degrees, an angle between the bottom surface portion (15A) and the lateral surface portion (15B) is 82 to 89 degrees, and with the piston (17) installed into the cylinder bore (13), the piston seal (16) abuts against the bottom surface portion (15A) and the lateral surface portion (15B) of the sealing groove (15).
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