DRUM BRAKE FOR VEHICLE
Disclosed herein a drum brake for a vehicle includes a drum rotating together with a wheel of the vehicle, a pair of brake shoes generating a braking force by friction with an inner surface of the drum, and a wheel cylinder provided between one ends of the pair of brake shoes to operate the pair of brake shoes outwardly, wherein the wheel cylinder includes a pair of pistons configured to press and release the pair of brake shoes, a cylinder configured to accommodate the pair of pistons movable forward and backward, and a pair of sealing members inserted into annular recessed grooves formed on an inner surface of the cylinder, and each of the sealing members returns the pair of pistons when a pressure of the pistons is released.
1 . A drum brake for a vehicle, comprising:
a drum rotating together with a wheel of the vehicle,
a pair of brake shoes generating a braking force by friction with an inner surface of the drum, and
a wheel cylinder provided between one ends of the pair of brake shoes to operate the pair of brake shoes outwardly, wherein
the wheel cylinder comprises:
a pair of pistons configured to press and release the pair of brake shoes,
a cylinder configured to accommodate the pair of pistons movable forward and backward, and
a pair of sealing members inserted into annular recessed grooves formed on an inner surface of the cylinder, and
each of the sealing members returns the pair of pistons when a pressure of the pistons is released.
2 . The drum brake of claim 1 , wherein
each of the sealing members is made of an elastic material.
3 . The drum brake of claim 1 , wherein
the wheel cylinder further includes a pair of dust covers provided at opposite ends of the cylinder to prevent an inflow of foreign substances, and
each of the dust covers has one side coupled to the cylinder and the other side coupled to the piston to return the piston when the pressure of the pistons is released.
4 . The drum brake of claim 3 , wherein
each of the dust covers is made of an elastic material.