A parking brake for a wheel rotor having a brake pad associated therewith includes a housing defining first and second passages. First and second pistons are provided in the respective first and second passages. Spindles extend into and are connected with each piston. A clutch unit is connected to the spindles and includes a motor. The clutch unit has a first condition allowing for rotation of the spindles in response to hydraulic pressure applied to the pistons such that the pistons are axially movable within the passages and relative to the spindles into engagement with the brake pad. The clutch unit has a second condition for rotating the spindles to drive the pistons into the brake pad and apply the parking brake.

Provided is a power transmitting device including an input side gear assembly that includes a single power input terminal and two power output terminals, an output side gear assembly that includes two power input terminals and a single power output terminal, the two power input terminals configured to operate using power received from the two power output terminals of the input side gear assembly, respectively, and a stopper module configured to block power to be transmitted through one of two power transmitting paths connecting the two power output terminals of the input side gear assembly and the two power input terminals of the output side gear assembly.

Since a second reinforcing rib (24e) protruding from a motor accommodating portion (24) to outside is provided to a portion formed with a weld line (WL) formed by the merger of molten resin (MR), the material thickness of the portion formed with the weld line (WL) can be increased. Therefore, the strength of the portion formed with the weld line (WL) is improved, and the strength of a case (21) as a whole can be improved. The case (21) sufficiently resistible to outer shocks can be achieved, and can be sufficiently used even in adverse environments such as a place near an undercarriage of a vehicle, and high reliability can be obtained. Since a small flange portion is provided on a caliper fixing portion side which supports an output shaft where large running torque is loaded, the weld line can be kept away from the caliper fixing portion, with this small flange portion taken as an inlet portion for the molten resin. Thus, with the caliper fixing portion side of the case inhibited from being distorted, it is possible to reliably inhibit unusual noise and so forth from occurring from an actuator.

Disclosed herein an electric parking brake includes a pair of pressing portions provided in a caliper housing to convert rotational motion into linear motion to press a brake pad; an actuator configured to transmit power to the pair of pressing portions; and a load control portion provided rotatably between the pair of pressing portions and the actuator, the load control portion applying a uniform load to the pair of pressing portions by pressing any one of the pair of pressing portions that generates a less load during braking operation.

An electromechanical service brake having an integrated electrical parking brake and comprising an electric motor and a control unit is presented. The parking brake has a blocking element which, in an arrested state of the parking brake, mechanically blocks a transmission of the electromechanical service brake. The electric motor and the transmission are surrounded by a housing which has a cutout that allows the blocking element to be manually actuated from the outside, such that the blocking element can, from the outside, be mechanically transferred from the arrested state into an opened state. In the opened state, the transmission is freely movable. The cutout is a non-circular formation that has at least one axially running guide groove and/or at least one axially running guide rib. Also presented are an unlocking tool and an assembly comprising the electromechanical service brake and the unlocking tool.

The present disk brake includes a braking force holding mechanism configured to restrict a rotation of a rotational shaft (a ratchet gear) to hold a braking force based on driving of a solenoid actuator. The braking force holding mechanism includes a holding member configured to move based on the driving of the solenoid actuator to restrict the rotation of the ratchet gear, and an engagement member coupled with this holding member. The engagement member is rotatably supported on a gear housing portion, and is configured to prohibit a movement of the holding member. Due to this configuration, an excitation force applied from outside to the holding member can be canceled out with the aid of the engagement member, and thus the disk brake can realize a size reduction and achieve cost saving.

An electromechanical brake for a motor vehicle. The electromechanical brake has a modular design, and a first module variant includes a brake clamp and a brake caliper housing connected to the brake clamp, in which housing a spindle drive unit and a worm gear operatively connected thereto are arranged, which are driven by an electric motor. A force can be applied to a brake piston for braking via the spindle drive unit. A second module variant, in addition to the first module variant, includes a planetary gear, which is also arranged in the brake caliper housing, between the worm gear and the spindle drive unit.

In an electric cylinder device including a third gear that rotates by receiving rotation of an electric motor and a linear motion conversion mechanism that converts the rotation of the third gear into linear motion of a piston inside a cylinder, a nut, which is a linear motion portion of the linear motion conversion mechanism, and the piston are connected in a state in which relative displacement in a radial direction is allowed.

In an electric cylinder device including a third gear that rotates by receiving rotation of an electric motor and a linear motion conversion mechanism that converts the rotation of the third gear into linear motion of a piston inside a cylinder, a nut, which is a linear motion portion of the linear motion conversion mechanism, and the piston are connected in a state in which relative displacement in a radial direction is allowed.

In an electric cylinder device including a third gear that rotates by receiving rotation of an electric motor and a linear motion conversion mechanism that converts the rotation of the third gear into linear motion of a piston inside a cylinder, a nut, which is a linear motion portion of the linear motion conversion mechanism, and the piston are connected in a state in which relative displacement in a radial direction is allowed.