A drum brake apparatus includes a housing; a main braking unit installed on one part of the housing, and driven by a hydraulic pressure and pressing a shoe, during main braking; and a parking braking unit installed on the other part of the housing, and driven by an electromotive force of an actuator and pressing the shoe, during parking braking, the parking braking unit includes a bevel gear section disposed in the housing while having a structure of a bevel gear, and rotated in association with the actuator; and a rod section connected with the bevel gear section, and moved out of the housing in association with the bevel gear section and pressing the shoe.

A brake device for a vehicle, including: a rotary body; a friction member; an actuator including a piston and an electric motor; a piston-retracting prohibiting mechanism including a toothed wheel having ratchet teeth, a stopper configured to lock the ratchet teeth, a stopper biasing mechanism configured to bias the stopper in a direction in which the stopper moves from a locking position to a non-locking position, and a stopper keeping device configured to keep the stopper positioned at the locking position by an electric current supplied thereto, the prohibiting mechanism being configured to prohibit the piston from being retracted in a state in which the stopper locks the ratchet teeth; and a controller configured to control supply of an electric current to the electric motor and supply of the electric current to the stopper keeping device, wherein an electricity storage device is provided in parallel with the stopper keeping device.

A vehicle drum brake including: a pair of brake shoes arranged to be expanded on a backing plate; a first parking lever disposed to rotate around a predetermined mounting shaft positioned at one end portion of one of the brake shoes; a second parking lever made up of a member different from the first parking lever, disposed to rotate around the mounting shaft, and coupled to and rotated together with the first parking lever; and a strut including a first strut member engaged with the first and second parking levers, the first and second parking levers are coupled to each other by a coupling pin so as to be engaged with the first strut member at the same time.

An expanding device for actuating one of the brake shoes of a drum brake includes a body of revolution and transmission bodies actuated by the body of revolution via ball track ramps. A spacer body is located between two partial bodies of the body of revolution, the spacer body guided by an adjustment spring keeping the partial bodies at the respectively reached distance. The spacer body is screwed onto a pin on the first partial body. A readjustment nut ensures that, when the two partial bodies are pushed apart, the spacer body rotates on the pin and moves away from a supporting surface on a partition of the second partial body. Upon renewed actuation of the brakes, the readjustment nut is guided such that the spacer body bears against the second partial body, but takes up a different position on the pin, the position corresponding to the air clearance readjustment.

One embodiment provides a vehicle brake apparatus, including: an electric actuator; and a drum brake. The drum brake is attached to a wheel so as to be driven by power exhibited by the electric actuator. In a state of being mounted on a vehicle, the electric actuator is disposed and fixed further rearwards than an axle of the wheel.

A brake device for a vehicle may include: a driving unit positioned in a drum and supplying rotation power; a nut screw positioned between first and second brake shoes; a first push rod having both sides connected to the first brake shoe and the nut screw, and pressurizing the first brake shoe through the rotation of the nut screw; a fixing protrusion fixed to a case surrounding the nut screw; a rotation connection part coupled to the fixing protrusion to restrict rotation of the rotation connection part; a rotation control part inserted into the rotation connection part so as to be screwed to the rotation connection part; and a second push rod having both sides connected to the second brake shoe and the rotation control part, and moved together with the rotation control part in a longitudinal direction so as to pressurize the second brake shoe.