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.

In some examples, an assembly includes a rotor drive key configured to be positioned over a wheel boss defined by a wheel. A drive key body defines a trough configured to receive the wheel boss. An inner surface of the drive key body is configured to establish a conforming contact with an outer profile of the wheel boss and oppose relative motion of the rotor drive key in a radial direction of the wheel. The rotor drive key includes a tab having a tab aperture configured to receive a fastener extending in an axial direction of the wheel and engaging the wheel boss.

A motor-specific electromagnetic braking device includes: a housing configured to rotatably house a rotating shaft portion of a motor; a hub attached to an outer perimeter of the rotating shaft portion; and a friction member configured to be rotatable together with the hub and movable in a direction of a rotation axis, and the friction member includes: a plate-shaped portion; and a friction portion provided to an outer-diameter portion of the plate-shaped portion, the hub is provided, on both sides in the direction of the rotation axis, with a pair of holding plates covering at least a part of the friction member, and inner-diameter portions of the pair of holding plates are fixed to the hub.

A manufacturing process may comprise: stacking a plurality of friction discs together, each friction disc comprising a lug defining a surface; and depositing a composition to bond to the surface of a first friction disc in the plurality of friction discs to form a wear pad defining a wear surface.

A tension brake assembly includes a frame, a plurality of brake pad assemblies, and a hub configured to be coupled to a rotating component. The hub includes a plurality of drive pins adjacent an annular wall. A rotor engages the plurality of drive pins such that rotation of the hub causes rotation of the rotor while permitting axial movement relative to the annular wall. The rotor has friction surfaces for engagement with the brake pad assemblies. An actuator is provided. Movement of the actuator in a first direction moves the friction components together in the axial direction to increase friction exerted by the tension brake assembly. Movement of the actuator in a second direction moves the friction components away from one another in the axial direction to decrease friction exerted by the tension brake assembly.

The disclosure provides a friction disk and a brake including a magnetic yoke iron core, a first movable plate, a friction disk, a first coil, at least one second coil, an armature and an elastic part; the magnetic yoke iron core includes a first mounting space, a second mounting space and at least one third mounting space distributed coaxially; the first movable plate is located in the first mounting space and close to a first shaft end; the friction disk is located in the first mounting space; the first coil is arranged in the second mounting space; the at least one second coil correspondingly is arranged in the at least one third mounting space; the armature is located at the second shaft end; the elastic part has a pre-tightening force that enables the armature to be far away from the magnetic yoke iron core.

The disclosure provides a magnetic yoke iron core and a brake including a magnetic yoke iron core, a first movable plate, a plurality of friction disks, at least one second movable plate, a coil, an armature and an elastic part; the first movable plate is located in a first mounting space and close to a first shaft end; a plurality of friction disks are sequentially arranged in the first mounting space along an axial direction of the magnetic yoke iron core and located at a side of the first movable plate close to a second shaft end; the coil is arranged in a second mounting space; the armature is connected with the first movable plate through a connector; the second movable plate is connected with the connector; and the elastic part having a pre-tightening force which enables the armature to be far away from the magnetic yoke iron core.

The disclosure provides a brake including a magnetic yoke iron core, a movable plate, a friction disk, a coil, an armature and an elastic part; a first mounting space penetrates through a center position of the magnetic yoke iron core in the axial direction; an opening of a second mounting space faces a second shaft end; the movable plate is located in the first mounting space and close to a first shaft end; the friction disk is arranged in the first mounting space and located at a side of the movable plate close to the second shaft end; the coil is arranged in the second mounting groove; the armature is located at the second shaft end, and the armature is connected with the movable plate through a connector; and the elastic part has pre-tightening force that enables the armature to be far away from the magnetic yoke iron core.

In some examples, a rotor drive key assembly configured to be positioned on a wheel includes an insert and a rotor drive key. The insert is configured to mate with a wheel boss of the wheel and mechanically connect the rotor drive key with the wheel boss. The rotor drive key is configured to mate with the insert such that the insert limits movement of the rotor drive key relative to the wheel boss in at least a radial direction of the wheel. In some examples, the rotor drive key includes a tab having a tab aperture configured to receive a fastener extending in an axial direction of the wheel and engaging the wheel boss.

A composite brake disc connecting assembly and a composite brake disc. The composite brake disc connecting assembly includes a sleeve (1) and a spring member (2); wherein the sleeve (1) includes an upper pressing plate (101), a lower pressing plate (102) and a connecting column (103); a connecting hole (104) is provided at the center of the connecting column (103), and a pair of U-shaped clamping slots are formed between the upper pressing plate (101), the lower pressing plate (102) and the connecting column (103); and the spring member (2) includes a pair of elastic pieces and a connecting bridge (201). The composite brake disc includes a brake disc hat (4), a friction ring (5) and a plurality of composite brake disc connecting assemblies; wherein the brake disc hat (4) is provided with disc hat notches (401) for mounting spring members (2), the friction ring (5) is provided with mounting holes (505) for accommodating connecting columns (103), and the friction ring (5) is connected to the brake disc hat (4) by fasteners (3) inserted onto the connecting columns (103). The composite brake disc has a simple structure, the friction ring (5) can move radially, reducing the deformation amount of the friction ring and preventing brake judder; the whole assembly process is simple, the number of parts is small, the production cost is reduced, and the sources causing variation during the process are reduced.