Technical Field
[0001]
The present invention relates to a disc brake device.
Background Art
[0002]
In the related art, in a disc brake device, a pair of
brake pads accommodated in a brake caliper clamp a brake
disc. Accordingly, the pair of brake pads brake the brake
disc. JP2004-183904A discloses a disc brake device mounted
on a vehicle such as an automobile, a motorcycle, or a motor
tricycle. In this disc brake device, the pair of brake pads
are pressed inward in a radial direction of the brake disc
by a pad spring (retainer). Accordingly, the pair of brake
pads are held by the brake caliper.
Summary of Invention
[0003]
The pad spring described above includes a plurality
of abutment portions and a connection portion. The
plurality of abutment portions press the pair of brake pads
2
inward in a radial direction of the brake disc. The
connection portion connects the plurality of abutment
portions. A width in an axial direction of the brake disc
in the connection portion is narrower than a width in the
axial direction of the brake disc in the plurality of
abutment portions. Accordingly, stress concentration may
occur in the connection portion. In this case, it is
conceivable to change a load at a stress concentration
portion in the connection portion by changing a plate
thickness, a material, or the like of the pad spring.
Accordingly, the stress concentration in the connection
portion is dispersed. However, such a method increases a
cost.
[0004]
In view of the above problem, it is desired that a
load at the stress concentration portion can be changed to
disperse the stress concentration without changing a plate
thickness, a material, or the like of a retainer and without
increasing a cost.
[0005]
An object of the invention is to solve the problem
described above.

CLAIMS
[Claim 1]
A disc brake device (10) comprising:
a brake disc (16);
a brake caliper (20) provided to straddle the brake
disc (16);
a pair of brake pads (48L, 48R) accommodated in the
brake caliper (20) and configured to clamp the brake disc
(16); and
a retainer (72) provided for the brake caliper (20)
and configured to abut against the pair of brake pads (48L,
48R) in order to cause the pair of brake pads (48L, 48R) to
be held by the brake caliper (20), wherein
the retainer (72) includes:
an abutment portion (72b, 72f) configured to
press the pair of brake pads (48L, 48R) inward in a radial
direction of the brake disc (16) by abutting against the
pair of brake pads (48L, 48R);
a connection portion (72c, 72e) connected to the
abutment portion (72b, 72f); and
a widened portion (72g, 72h) provided in the
connection portion (72c, 72e) and configured to alleviate
stress concentration at the connection portion (72c, 72e)
by being formed to be wider in an axial direction (W) of
the brake disc (16) than other portion in the connection
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portion (72c, 72e).
[Claim 2]
The disc brake device (10) according to claim 1,
wherein
when an inlet side of the brake caliper (20) in a
rotation direction (Cr) of the brake disc (16) is a disc
rotation-in side (28) and an outlet side of the brake
caliper (20) in the rotation direction (Cr) is a disc
rotation-out side (30), the abutment portion (72b, 72f) is
provided to press the pair of brake pads (48L, 48R) inward
in the radial direction and toward the disc rotation-out
side (30),
the connection portion (72c, 72e) is connected to the
disc rotation-in side (28) of the abutment portion (72b,
72f), and
the widened portion (72g, 72h) is formed adjacent to
the abutment portion (72b, 72f) at the connection portion
(72c, 72e).