A disc brake provided with a guide spring capable of preventing a vibration of a pad plate having a friction pad mounted thereon, and capable of separating the friction pad from a disc in a rapid manner after a braking operation is finished, the disc brake including a disc rotating together with a wheel of a vehicle, two pad plates disposed at both lateral sides of the disc, respectively, to perform a braking by pressing both lateral side surfaces of the disc and each having a friction pad, a caliper housing and a piston that are configured to press the pad plate, and a guide spring enabling the pad plates to operate as an integral body and absorb shock.
1. A disc brake having a disc rotating together with a wheel of a vehicle, two pad plates disposed at both lateral sides of the disc, respectively, to perform a braking by pressing both lateral side surfaces of the disc and each having a friction pad, and a caliper housing and a piston that are configured to press the pad plate, the disc brake comprising:
a protrusion unit protruding from two end portions of an outer side of the caliper housing, a coupling unit protruding from two end portions of each of the pad plates, and a guide spring formed in a bent manner to surround the protrusion unit and the coupling unit,
wherein the guide spring extends from a coupling unit of one of the pad plates to a coupling unit of the other one of the pad plates along a first path, and extends from the coupling unit of the other one of the pad plates back to the coupling unit of the one of the pad plates along a second path different from the first path.
2. The disc brake of claim 1 , wherein the caliper housing comprises a first accommodation groove formed at the protrusion unit such that the guide spring is engaged with the first accommodation groove, and
the pad plate comprises a second accommodation groove formed at an upper side of the coupling unit such that the guide spring is engaged with the second accommodation groove, and a third accommodation groove formed at a lower side of the coupling unit such that the guide spring is engaged with the third accommodation groove.
3. The disc brake of claim 2 , wherein the guide spring comprises a support unit configured to support a portion of one of the two pad plates, an inner side sliding unit and an outer side sliding unit, which are extending in a bent manner from both end portions of the support unit so as to be coupled in a supporting manner at the second accommodation groove and the third accommodation groove, respectively, a fixing unit coupled to surround a coupling portion of the remaining of the two pad plates, and a locking unit formed between the fixing unit and the inner side sliding unit so as to be coupled in an engaging manner at the first accommodation groove formed on the protrusion unit.
4. The disc brake of claim 1 , wherein the guide spring has a closed-loop shape.