Brakes – Wheel – Axially movable brake element or housing therefor
Reexamination Certificate
1999-07-28
2001-06-19
Oberleitner, Robert J. (Department: 3613)
Brakes
Wheel
Axially movable brake element or housing therefor
C188S073450
Reexamination Certificate
active
06247561
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a disk brake which is advantageously used for applying a braking force to, for example, a vehicle.
A disk brake generally comprises a carrier which includes a connecting portion fixedly mounted on a non-rotational portion of a vehicle body and a pair of arms extending from the connecting portion across a disk so as to be spaced apart from each other in a circumferential direction of the disk. A caliper is supported by the carrier so as to be movable along the axis of the disk.
The caliper comprises a cylinder portion having a bore for receiving a piston for braking, a bridging portion extending from the cylinder portion across the disk and a claw portion extending from the bridging portion toward the center of the disk. The caliper further comprises two mounting portions for securing pins which are slidably supported in the arms of the carrier.
During braking, the bridging portion of the caliper receives a bending moment. Therefore, a problem arises, that a brake pad at an inner side of the disk, which is in contact with the disk during braking, receives high contact pressure at a portion thereof on the entrance side with respect to the rotation direction of the disk (on a side on which the disk enters the brake pad), leading to an increase in amount of wear at that portion of the pad. As a countermeasure for this problem, it has been known to offset the center of the cylinder portion from the center between the two mounting portions toward a side opposite to the entrance side, i.e., the exit side with respect to the rotation direction of the disk. By this arrangement, the above-mentioned problem is solved to a certain degree, but cannot be completely overcome. Thus, it has been desired to develop a further improved disk brake to avoid the above-mentioned problem.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a disk brake comprising a carrier fixedly mounted on a non-rotational portion of a vehicle body a caliper slidably supported relative to the carrier by fitting a sliding pin provided in one of the carrier and the caliper into a guide bore formed in the other of the carrier and the caliper and a first friction member and a second friction member disposed at axially opposite sides of a disk. The first friction member is adapted to press one side of the disk according to a motion of a piston provided in the caliper, and the second friction member is adapted to press the second friction member against the other side of the disk according to a sliding motion of the caliper relative to the carrier which occurs when the piston presses the first friction member. The caliper comprises a cylinder portion, disposed at one side of the disk, having a cylinder bore, the piston being slidably provided in the cylinder bore a bridging portion extending across an outer periphery of the disk along the axis of the disk and a claw portion connected to the cylinder portion through the bridging portion and disposed at the other side of the disk to press the second friction member. The caliper further comprises a first mounting portion extending from the cylinder portion toward an entrance side with respect to a rotation direction of the disk and a second mounting portion extending from the cylinder portion toward an exit side with respect to the rotation direction of the disk. Each of the first and second mounting portions has a distal end portion connected to the carrier through the sliding pin.
A characteristic feature of the present invention resides in that the first and second mounting portions are formed such that, relative to the rotation direction of the disk, a length of the first mounting portion is greater than a length of the second mounting portion so that the center of the cylinder bore is offset relative to the disk toward the exit side, and such that, with respect to a direction of the axis of the disk, flexural rigidity of the first mounting portion is higher than flexural rigidity of the second mounting portion.
REFERENCES:
patent: 4878564 (1989-11-01), Kondo
patent: 5178236 (1993-01-01), Terashima
patent: 5259484 (1993-11-01), Idesawa et al.
patent: 5975252 (1999-11-01), Suzuki et al.
Doi Kazuhiro
Hamabe Tsutomu
Ishii Hideaki
Tamasho Tadashi
Tokunaga Takahiro
Oberleitner Robert J.
Rodriguez Pamela J.
Tokico Ltd.
Wenderoth , Lind & Ponack, L.L.P.
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