Electric caliper brake
According to an aspect of the present disclosure, there is provided an electric caliper brake including a carrier at which a pair of pad plates are installed to be movable forward and backward, and a caliper housing slidably installed at the carrier and provided with a cylinder in which a piston having a concave cup-shaped interior is installed to be movable forward and backward by a braking hydraulic pressure, the electric caliper brake comprising: a power converter provided with a spindle member installed to pass through a rear portion of the cylinder and rotated by receiving a rotational force from an actuator, and a nut member configured with a rod screw-coupled to the spindle member and disposed inside the piston and a head portion formed to extend from the rod in a radial direction to be in contact with the piston; and a blocking member having one end installed at the piston and the other end installed at the rod and configured to seal an inner space of the piston.
1. An electric caliper brake including a carrier at which a pair of pad plates are installed to be movable forward and backward, and a caliper housing slidably installed at the carrier and provided with a cylinder in which a piston having a concave cup-shaped interior is installed to be movable forward and backward by a braking hydraulic pressure, the electric caliper brake comprising:
a power converter provided with a spindle member installed to pass through a rear portion of the cylinder and rotated by receiving a rotational force from an actuator, and a nut member configured with a rod screw-coupled to the spindle member and disposed inside the piston and a head portion formed to extend from the rod in a radial direction to be in contact with the piston; and
a blocking member having one end installed at the piston and the other end installed at the rod and configured to seal an inner space of the piston,
wherein:
a first engagement recess is formed on an inner circumferential surface of the piston to allow the one end of the blocking member to be engaged with the first engagement recess, and
a second engagement recess is formed on an outer circumferential surface of the rod to allow the other end of the blocking member to be engaged with the second engagement recess.
2. The electric caliper brake of claim 1 , wherein the blocking member includes:
a body having a center hollow ring shape;
a first sealing member formed on an outer circumferential surface of the body and installed at the first engagement recess; and
a second sealing member formed on an inner circumferential surface of the body and installed at the second engagement recess.
3. The electric caliper brake of claim 2 , wherein the body and the first and second sealing members are integrally formed by insert injection.
4. The electric caliper brake of claim 2 , wherein the body is made of a steel material to have a predetermined rigidity.
5. The electric caliper brake of claim 2 , wherein the first and second sealing members are each made of an ethylene propylene diene monomer (EPDM).
6. The electric caliper brake of claim 2 , wherein the second sealing member is formed in a circular shape.
7. The electric caliper brake of claim 1 , wherein the second engagement recess has a predetermined length in a moving direction of the piston to allow the blocking member to move together with the piston when the piston moves by the braking hydraulic pressure and to slide on the outer circumferential surface of the rod.
8. The electric caliper brake of claim 1 , wherein, when the piston is pressurized and released by the nut member moving forward and backward according to rotation of the spindle member, the blocking member moves together with the nut member and the piston.