An electromechanical brake comprising mobile induced elements or sectors or frames (2), the number of mobile induced elements (2) or sectors being at least three, where one of the sectors acts faster than the rest, and where one of the sectors acts in a delayed manner with respect to the rest of the sectors in the case of an emergency, said time-delayed actuation being achieved by means of the antiparallel arrangement of a diode (6) on the coil (5) associated with said sector. Smooth and progressive stop is thus achieved in the case of an emergency.

A hydraulic device is provided with a sleeve insert disposed between a driven hub and a stationary housing. The hydraulic device further includes a hydraulic motor to actuate the driven hub through a drive shaft and a coupling mechanism. A sealing element is disposed between the sleeve insert and the stationary housing. The sleeve insert is fixed to the driven hub and disposed between the stationary housing and the driven hub to provide a riding surface on which the sealing element slides as the driven hub rotates relative to the stationary housing.

A hydraulic device is provided with a sleeve insert disposed between a driven hub and a stationary housing. The hydraulic device further includes a hydraulic motor to actuate the driven hub through a drive shaft and a coupling mechanism. A sealing element is disposed between the sleeve insert and the stationary housing. The sleeve insert is fixed to the driven hub and disposed between the stationary housing and the driven hub to provide a riding surface on which the sealing element slides as the driven hub rotates relative to the stationary housing.

A brake device that can be cooled effectively while reducing a friction loss of a rotary member is provided. In the brake device, a second friction face formed on a brake stator is brought into contact to a first friction face formed on a brake rotor to stop rotation of a rotary shaft, and coolant is held in a casing. The brake device comprises a first cooling groove formed on the brake rotor to allow the coolant to flow over the first friction face, and a second cooling groove formed on the brake stator to allow the coolant to flow over the second friction face.

A motor assembly having a brake device and a downsized cooling system is provided. The motor assembly comprises a drive motor, a brake device that stops rotation of a motor shaft, and a casing that holds the drive motor and the brake device. The motor assembly further comprises a hollow passage formed in the motor shaft to allow cooling medium to flow therethrough, a centrifugal passage formed in the brake rotor from the hollow passage to an opening of the brake rotor, and a return passage that returns the cooling medium discharged from the opening to the hollow passage.

A motor assembly having a brake device and a downsized cooling system is provided. The motor assembly comprises a drive motor, a brake device that stops rotation of a motor shaft, and a casing that holds the drive motor and the brake device. The motor assembly further comprises a hollow passage formed in the motor shaft to allow cooling medium to flow therethrough, a centrifugal passage formed in the brake rotor from the hollow passage to an opening of the brake rotor, and a return passage that returns the cooling medium discharged from the opening to the hollow passage.

A brake piston is described. The brake piston is configured for use in a disk brake system, the piston comprising: a body having an outside width perpendicular to a central axis; a footing disposed at a distal end of the piston; wherein the footing is configured to exert force on a brake pad during actuation of the disk brake system; the footing having a face configured to contact the brake pad, the face having a length and a width, wherein the length is longer than the outside width of the body, and the length is greater than the width.

An elevator disc brake assembly includes at least two separate operating disc brake units mounted substantially sequentially on the periphery of the brake disc of an elevator driving machinery where the brake disc and a traction sheave are rotated by a drive motor of the driving machinery. At least one of the disc brake units includes two or more separate brake plates to be pressed against the brake disc.

An elevator disc brake assembly includes at least two separate operating disc brake units mounted substantially sequentially on the periphery of the brake disc of an elevator driving machinery where the brake disc and a traction sheave are rotated by a drive motor of the driving machinery. At least one of the disc brake units includes two or more separate brake plates to be pressed against the brake disc.

An elevator brake arrangement includes at least a brake unit including a body, a brake plate assembly, a spring assembly, an electromagnet arrangement and a counter element, and also a rotating brake disc. The brake plate assembly includes at least two brake plates and a state detector that is arranged to monitor the operation states of the brake plates.