A power tool comprises a motor, a final output shaft, a tool body, a detection device, and a braking device. The motor has a motor body including a stator and a rotor, and a motor shaft extending from the rotor and being rotatable around a first rotational axis. The final output shaft is configured to be rotationally driven around a second rotational axis by torque transmitted from the motor shaft. The tool body houses the motor and the final output shaft. The detection device is configured to detect a locking state of the final output shaft. The braking device is configured to directly act on the motor shaft to brake the motor shaft in response to detection of the locking state.

An electromagnetic brake device presses a pressing plate against a brake rotor along an axis via a friction material by the electromagnetic force of an electromagnetic actuator. The electromagnetic brake device includes a support member that is disposed on the opposite side of the pressing plate to the brake rotor and that is supported by a housing so as to be displaceable along the axis and non-rotatable around the axis, and a shaft member that transmits a force in the direction along the axis between the pressing plate and the support member. An electromagnetic coil and an armature of the electromagnetic actuator are spaced apart from the pressing plate between the pressing plate and the support member, the electromagnetic coil is supported by the housing, and the armature is supported by the support member.

An electromagnetic brake device presses a pressing plate against a brake rotor along an axis via a friction material by the electromagnetic force of an electromagnetic actuator. The electromagnetic brake device includes a support member that is disposed on the opposite side of the pressing plate to the brake rotor and that is supported by a housing so as to be displaceable along the axis and non-rotatable around the axis, and a shaft member that transmits a force in the direction along the axis between the pressing plate and the support member. An electromagnetic coil and an armature of the electromagnetic actuator are spaced apart from the pressing plate between the pressing plate and the support member, the electromagnetic coil is supported by the housing, and the armature is supported by the support member.

A parking brake apparatus for a vehicle including a motor section receiving electric power, and generating power; a power transmission section rotated by driving the motor section; a pair of pressing units receiving power from the power transmission section and pressing a brake pad; a load transmission unit installed between the pair of pressing units, connected to each of the pair of pressing units, and transmitting a pressing load of any one of the pair of pressing units to the other pressing unit; and a caliper housing having installed therein the pressing units, wherein the motor section is mounted to an upper surface of the caliper housing.

A parking brake apparatus for a vehicle including a motor section receiving electric power, and generating power; a power transmission section rotated by driving the motor section; a pair of pressing units receiving power from the power transmission section and pressing a brake pad; a load transmission unit installed between the pair of pressing units, connected to each of the pair of pressing units, and transmitting a pressing load of any one of the pair of pressing units to the other pressing unit; and a caliper housing having installed therein the pressing units, wherein the motor section is mounted to an upper surface of the caliper housing.

A yaw braking assembly of a wind turbine is presented. Accordingly, the yaw braking assembly includes a bedplate support frame having an annular flange defining a plurality of recesses formed into a lower-most annular surface of the annular flange and extending at least partially through an axial thickness of the annular flange. Each of the plurality recesses define an open exterior circumferential side. The yaw braking assembly also includes a plurality of brake pads which are positioned within the plurality of recesses and configured to engage at least one race of an adjacent yaw bearing. The yaw braking assembly further includes a plurality of actuators for driving the plurality of brake pads to engage the yaw bearing.

A yaw braking assembly of a wind turbine is presented. Accordingly, the yaw braking assembly includes a bedplate support frame having an annular flange defining a plurality of recesses formed into a lower-most annular surface of the annular flange and extending at least partially through an axial thickness of the annular flange. Each of the plurality recesses define an open exterior circumferential side. The yaw braking assembly also includes a plurality of brake pads which are positioned within the plurality of recesses and configured to engage at least one race of an adjacent yaw bearing. The yaw braking assembly further includes a plurality of actuators for driving the plurality of brake pads to engage the yaw bearing.

Torque tubes with better total failure performance is provided. The torque tube comprises a plurality of reinforcement members made from a second material with a higher temperature strength than the first material. In preferred embodiments, the reinforcement members are tungsten rods. The reinforcement members are located concentrically around a central axis of the torque tube and each reinforcement member spans a center line of a central tube of the torque tube and spans a majority of a longitudinal length of the torque tube. In preferred embodiments, the reinforcement members are drive keys.

There is disclosed an aircraft engine assembly including an engine having an engine shaft; an output shaft; a clutch in driving engagement between the engine shaft and the output shaft. The clutch has a first component in driving engagement with the engine shaft and a second component. The clutch is operable between first and second configurations. In the first configuration, the first component is rotatable relative to the second component and the engine shaft is rotatable relative to the output shaft. In the second configuration, the first and second components are engaged with one another and the engine shaft rotates with the output shaft. A mechanical lock is operable between first and second positions. In the first position, the mechanical lock is disengaged from the first component. In the second position, the first and second components are secured for joint rotation one relative to the other.

There is disclosed an aircraft engine assembly including an engine having an engine shaft; an output shaft; a clutch in driving engagement between the engine shaft and the output shaft. The clutch has a first component in driving engagement with the engine shaft and a second component. The clutch is operable between first and second configurations. In the first configuration, the first component is rotatable relative to the second component and the engine shaft is rotatable relative to the output shaft. In the second configuration, the first and second components are engaged with one another and the engine shaft rotates with the output shaft. A mechanical lock is operable between first and second positions. In the first position, the mechanical lock is disengaged from the first component. In the second position, the first and second components are secured for joint rotation one relative to the other.