TECHNICAL FIELD

The present invention relates to a vehicular disk brake, more particularly to a vehicular disk brake in which a pad spring for suppressing the rattling of friction pads is disposed between a bridge portion of a caliper body and the friction pads.

BACKGROUND ART

In some conventional vehicular disk brakes, the rattling of friction pads is suppressed by attaching a pad spring to the disc radial inner side surface of the middle portion in the disc circumferential direction of a bridge portion and bringing a resilient portion of the pad spring into contact with the disk radial outer surfaces of the friction pads (see, for example, PTL 1).

CITATION LIST

Patent Literature

PTL 1: JP-A-2014-173622

SUMMARY OF INVENTION

Technical Problem

However, since the pad spring is attached to the disk radial inner side surface of the middle portion in the disk circumferential direction of the bridge portion in PTL 1, a predetermined clearance needs to be provided between the bridge portion and the friction pads to ensure a resilient force of the pad spring, there is a risk that the size of the caliper body is increased. In addition, the middle portion in the disk circumferential direction of the bridge portion is formed thick to ensure the rigidity of the middle portion in the disk circumferential direction of the bridge portion to which the pad spring is attached, thereby causing a risk of hindering the lightening of the caliper body.

Therefore, an object of the invention is to provide a vehicular disc brake in which a pad spring can be attached preferably while downsizing and lightening the caliper body.

Solution to Problem

To achieve the above object, according to the invention, there is provided a vehicular disc brake in which a caliper body is formed by connecting, via a bridge portion straddling an outer periphery of a disc rotor, a pair of action portions facing each other with the disc rotor sandwiched therebetween, the action portions are provided with a pair of friction pads accommodating portions that accommodates a pair of friction pads disposed with the disc rotor sandwiched therebetween, ear pieces project on a disc turn-in side and a disc turn-out side in vehicle forward movement on a disc radial outer side of each of the friction pads, and torque reception stepped portions are formed on the disc radial outer side of each of the friction pad accommodating portions, the torque reception stepped portions supporting the ear pieces so that the ear pieces are movable in a disc shaft direction, the vehicular disc brake further including a turn-in side pad spring that has a turn-in side resilient portion attached to a part of the bridge portion on the disc turn-in side in vehicle forward movement of the friction pad accommodating portions, the turn-in side resilient portion biasing the friction pads to a disc radial inner side and the disc turn-out side, and a turn-in side retainer portion laid on one of the torque reception stepped portions on the disc turn-in side; and a turn-out side pad spring that has a turn-out side resilient portion attached to a part of the bridge portion on the disc turn-out side in vehicle forward movement of the friction pad accommodating portions, the turn-out side resilient portion biasing the friction pads to the disc radial inner side, and a turn-out side retainer portion laid on the other of the torque reception stepped portions on the disc turn-out side.

In addition, preferably, each of the friction pads has a pair of projecting pieces projecting toward the disc radial outer side on a disc radial outer surface, the friction pads being formed symmetrically with respect to a center line extending in a disc radial direction, the turn-in side resilient portion has a turn-in side attachment portion to be attached to a disc radial inner side surface of the bridge portion, a turn-in side extending piece extending to the disc radial outer side of the friction pads from the turn-in side attachment portion, and a turn-in side resilient piece that is folded toward the friction pads via a curved portion from a projecting end portion of the turn-in side extending piece and has an end portion in contact with disc turn-in side surfaces of the projecting pieces on the disc turn-in side, and the turn-out side resilient portion has a turn-out side attachment portion to be attached to the disc radial inner side surface of the bridge portion, a turn-out side extending piece extending to the disc radial outer side of the friction pads from the turn-out side attachment portion, and a turn-out side resilient piece that is folded toward the friction pads via a curved portion from a projecting end portion of the turn-out side extending piece and has an end portion in contact with the disc radial outer side surfaces of the friction pads.

In addition, preferably, the bridge portion is provided with the ceiling opening, the friction pad accommodating portions are formed on the disc radial inner side of the ceiling opening, the turn-in side pad spring has a turn-in side holding piece that makes contact with a disc turn-in side surface of the ceiling opening and extends to the disc radial outer side of the turn-in side resilient portion and the turn-in side retainer portion is formed on the disc radial inner side of the turn-in side holding piece, and the turn-out side pad spring has a turn-out side holding piece that makes contact with a disc turn-out side surface of the ceiling opening and extends to the disc radial outer side of the turn-out side resilient portion and the turn-out side retainer portion is formed on the disc radial inner side of the turn-out side holding piece.

Advantageous Effects of Invention

Since the turn-in side pad spring is attached to a part of the bridge portion of the caliper body on the disc turn-in side in vehicle forward movement of the friction pad accommodating portions and the turn-out side pad spring is attached to a part of the bridge portion on the disc turn-out side in vehicle forward movement of the friction pad accommodating portions in vehicular disc brake according to the invention, a clearance for ensuring a resilient force of the pad spring does not need to be provided between the bridge portion and the friction pads and the caliper body can be downsized. In addition, since it is not necessary to form the bridge portion thick to attach the turn-in side pad spring and the turn-out side pad spring, there is no risk that the weight of the caliper body is increased.

Furthermore, the pair of projecting pieces projecting toward the disc radial outer side are formed on the friction pads, the friction pads are formed symmetrically with respect to the center line extending in the disc radial direction, the turn-in side resilient portion of the turn-in side pad spring has the turn-in side attachment portion, the turn-in side extending piece, and the turn-in side resilient piece that is folded toward the friction pads via the curved portion from the projecting end portion of the turn-in side extending piece and has the end portion in contact with disc turn-in side surfaces of the projecting pieces on the disc turn-in side, and the turn-out side resilient portion of the turn-out side pad spring has the turn-out side attachment portion, the turn-out side extending piece, and the turn-out side resilient piece that is folded toward the friction pads via the curved portion from the projecting end portion of the turn-out side extending piece and has the end portion in contact with the disc radial outer side surfaces of the friction pads. Accordingly, the pair of friction pads can be formed in the same shape, thereby achieving cost reduction.

In addition, the bridge portion is provided with a ceiling opening, the friction pad accommodating portions are formed on the disc radial inner side of the ceiling opening, the turn-in side pad spring has a turn-in side holding piece that makes contact with a disc turn-in side surface of the ceiling opening and extends to the disc radial outer side of the turn-in side resilient portion, and the turn-out side pad spring has a turn-out side holding piece that makes contact with a disc turn-out side surface of the ceiling opening and extends to the disc radial outer side of the turn-out side resilient piece. Accordingly, when the turn-in side pad spring, the turn-out side pad spring, and the friction pads are assembled to the caliper body, the turn-in side holding piece and the turn-out side holding piece can stably hold the turn-in side pad spring and the turn-out side pad spring, thereby improving assemblability.

