| US 7,490,703 B2 | ||
| Disc brake actuating apparatus with parking-brake operating mechanism | ||
| Toshifumi Maehara, Tokyo (Japan) | ||
| Assigned to Akebono Brake Industry Co., Ltd., Tokyo (Japan) | ||
| Filed on Dec. 07, 2005, as Appl. No. 11/295,484. | ||
| Claims priority of application No. P. 2004-357237 (JP), filed on Dec. 09, 2004. | ||
| Prior Publication US 2006/0124407 A1, Jun. 15, 2006 | ||
| Int. Cl. F16D 55/26 (2006.01); F16D 65/14 (2006.01) | ||
| U.S. Cl. 188—72.6 [188/72.7; 188/72.8; 188/72.9; 188/71.9] | 9 Claims |
| 1. A disc brake actuating apparatus comprising:
a caliper;
a piston slidably supported by the caliper and containing an adjuster mechanism; and
a parking-brake operating mechanism provided at one end portion of the caliper, wherein the parking-brake operating mechanism
includes:
an adjusting spindle of the adjuster mechanism;
a cam shaft disposed perpendicularly to the adjusting spindle;
a parking lever connected to one end of the cam shaft; and
a first thrust transmitting assembly disposed between the cam shaft and the adjusting spindle, wherein the first thrust transmitting
assembly transmits an axial thrust to the adjusting spindle when the cam shaft is angularly moved,
a second thrust transmitting assembly provided between the cam shaft and the caliper on a side of the cam shaft facing away
from a rotor, and
wherein the first thrust transmitting assembly includes:
a first rolling roller that rolls between the cam shaft and the adjusting spindle, while the first rolling roller rotates
about its axis; and
first rolling curved surfaces provided respectively at the cam shaft and the adjusting spindle, wherein the first rolling
roller is cylindrical, and is disposed in contact with the first rolling curved surfaces,
wherein the second thrust transmitting assembly includes:
a second rolling roller that rolls between the cam shaft and the caliper, while the second rolling roller rotates about its
axis; and
second rolling curved surfaces provided respectively at the cam shaft and the caliper, wherein the second rolling roller is
cylindrical, and is disposed in contact with the second rolling curved surfaces,
wherein the first rolling curved surface on the cam shaft and the second rolling curved surface on the cam shaft are arranged
symmetrically with respect to a rotating axis of the cam shaft,
wherein a center of curvature of the first rolling curved surface of the cam shaft is spaced a predetermined distance from
the rotating axis of the cam shaft,
a center of curvature of the second rolling curved surface of the cam shaft is spaced the predetermined distance from the
rotating axis of the cam shaft,
the center of curvature of the first rolling curved surface is spaced the predetermined distance from the rotating axis in
a first direction, and
the center of curvature of the second rolling curved surface is spaced the predetermined distance from the rotating axis in
a second direction opposite to the first direction.
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