DISC BRAKE DEVICE

WIPO Patent Application WO/2021/002151

A1

The present invention addresses the problem of providing a disc brake device for which sliding at the boundary of a piston seal and a piston is reduced, and dragging is reduced.　The present invention is provided with a cylinder 6, a piston 18 housed in the cylinder 6, an inner brake pad 2 opposing a disc rotor 12, an inner circumferential groove 44 formed in a cylinder inner circumference 51, and a piston seal 43 that is provided in the inner circumferential groove 44 and contacts the piston 18. The inner circumferential groove 44 is provided with a wall 45, a wall 46 on the opposite side from the wall 45, a bottom wall 47 connecting the wall 45 and the wall 46, and a curved surface 50 expanding the inner circumferential groove 44 at the wall 46. The bottom wall 47 is formed such that the distance to the piston gradually increases from the wall 45 toward the wall 46. The curved surface 50 is provided with a curvature starting point 48 on the side closer to the piston seal 43 and a curvature endpoint 49 on the opposite side from the curvature starting point 48 with the curved surface 50 therebetween, and the curvature endpoint 49 is positioned farther outside than the cylinder inner circumference 51.

MATSUSHITA KOHEI (JP)
ISHITSUKA NORIO (JP)
TANIE HISASHI (JP)
NISHINO YUSUKE (JP)

PCT/JP2020/022550

January 07, 2021

June 08, 2020

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HITACHI AUTOMOTIVE SYSTEMS LTD (JP)

F16D65/18; F16D55/22; F16J15/18; F16D121/04; F16D125/04; F16D125/08

JP2009535587A	2009-10-01
JPH08233002A	1996-09-10
JPH08177910A	1996-07-12
JPH11280805A	1999-10-15

POLAIRE I.P.C. (JP)

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