A power booster includes a conversion device, a power boosting component, a power boosting friction block, a friction part, a power boosting support, a sliding device. The conversion device is fixed to the power boosting component, the power boosting friction block is fixed to the power boosting component, the power boosting friction block and the friction part contact with each other after being pressed, the power boosting component is movably connected to the power boosting support, the friction part is movably connected to the power boosting support, the sliding device is connected to the power boosting component and the power boosting support. The power booster introduces the controlling force from the inlet, and amplifies the controlling force. The amplified controlling force is output by the power boosting component to push the part that needs to be controlled.

The disclosed strap adjustment device may include a pinion gear secured to an adjustment knob, a first rack secured to a first strap and engaged with the pinion gear, a second rack secured to a second strap and engaged with the pinion gear, a braking element disposed adjacent to an inner surface of a drum, a brake engagement element configured to press the at least one braking element toward the inner surface of the drum to maintain a length of the first strap and the second strap by engagement of the braking element against the inner surface of the drum, and a spiral spring configured to allow for an increase in a length of the first strap and the second strap when a tension force is applied to at least one of the first strap or the second strap.

The disclosed strap adjustment device may include a pinion gear secured to an adjustment knob, a first rack secured to a first strap and engaged with the pinion gear, a second rack secured to a second strap and engaged with the pinion gear, a braking element disposed adjacent to an inner surface of a drum, a brake engagement element configured to press the at least one braking element toward the inner surface of the drum to maintain a length of the first strap and the second strap by engagement of the braking element against the inner surface of the drum, and a spiral spring configured to allow for an increase in a length of the first strap and the second strap when a tension force is applied to at least one of the first strap or the second strap.

An actuator for use in a drum-in-hat parking brake includes a wedge. A pair of tappets oppositely disposed from each other such that a tappet is positioned adjacent opposite sides of the wedge is included and a bearing is positioned between the wedge and an adjacent tappet. The bearing rolls along and between the wedge and the adjacent tappet and forces the pair of tappets apart from each other when the wedge moves relative to the pair of tappets. Movement of the pair of tappets away from each is used to force a pair of brake shoes into contact with a brake drum and provide a desired braking force on a brake drum.

An actuator for use in a drum-in-hat parking brake includes a wedge. A pair of tappets oppositely disposed from each other such that a tappet is positioned adjacent opposite sides of the wedge is included and a bearing is positioned between the wedge and an adjacent tappet. The bearing rolls along and between the wedge and the adjacent tappet and forces the pair of tappets apart from each other when the wedge moves relative to the pair of tappets. Movement of the pair of tappets away from each is used to force a pair of brake shoes into contact with a brake drum and provide a desired braking force on a brake drum.

An actuator for use in a drum-in-hat parking brake includes a wedge. A pair of tappets oppositely disposed from each other such that a tappet is positioned adjacent opposite sides of the wedge is included and a bearing is positioned between the wedge and an adjacent tappet. The bearing rolls along and between the wedge and the adjacent tappet and forces the pair of tappets apart from each other when the wedge moves relative to the pair of tappets. Movement of the pair of tappets away from each is used to force a pair of brake shoes into contact with a brake drum and provide a desired braking force on a brake drum.

An actuator for use in a drum-in-hat parking brake includes a wedge. A pair of tappets oppositely disposed from each other such that a tappet is positioned adjacent opposite sides of the wedge is included and a bearing is positioned between the wedge and an adjacent tappet. The bearing rolls along and between the wedge and the adjacent tappet and forces the pair of tappets apart from each other when the wedge moves relative to the pair of tappets. Movement of the pair of tappets away from each is used to force a pair of brake shoes into contact with a brake drum and provide a desired braking force on a brake drum.

The disclosed strap adjustment device may include a pinion gear secured to an adjustment knob, a first rack secured to a first strap and engaged with the pinion gear, a second rack secured to a second strap and engaged with the pinion gear, a braking element disposed adjacent to an inner surface of a drum, a brake engagement element configured to press the at least one braking element toward the inner surface of the drum to maintain a length of the first strap and the second strap by engagement of the braking element against the inner surface of the drum, and a spiral spring configured to allow for an increase in a length of the first strap and the second strap when a tension force is applied to at least one of the first strap or the second strap.

The disclosed strap adjustment device may include a pinion gear secured to an adjustment knob, a first rack secured to a first strap and engaged with the pinion gear, a second rack secured to a second strap and engaged with the pinion gear, a braking element disposed adjacent to an inner surface of a drum, a brake engagement element configured to press the at least one braking element toward the inner surface of the drum to maintain a length of the first strap and the second strap by engagement of the braking element against the inner surface of the drum, and a spiral spring configured to allow for an increase in a length of the first strap and the second strap when a tension force is applied to at least one of the first strap or the second strap.

An electromotive actuator assembly for an electromechanical vehicle brake is disclosed having a transmission that comprises transmission shafts, cylindrical brake surface provided in the transmission and which encircles an axis of rotation, and a blocking element mounted eccentrically with respect to the axis of rotation. The blocking element is adjustable about a pivot axis by a drive unit and can be placed in contact with the cylindrical brake surface. The blocking element is arranged so as to become wedged together with the cylindrical brake surface with self-locking action in only one direction of rotation of the cylindrical brake surface about the axis of rotation (A). The disclosure also relates to a method for activating and deactivating a parking brake function.