A brake disk includes a first abrasive disk, a second abrasive disk and a heat dissipation disk co-axially sandwiched between the first abrasive disk and the second abrasive disk. A middle disk is co-axially mounted onto the first abrasive disk and the second abrasive disk, wherein the middle disk is adapted to be mounted to a hub. A specific heat capacity coefficient of the heat dissipation disk is greater than that of the first abrasive disk and the second abrasive disk for absorbing thermal energy from the first abrasive disk and the second abrasive disk and lowering the temperature of the first abrasive disk and the second abrasive disk during braking.

A bidirectional magnetic clutch for an additive manufacturing system, comprising a concentric arrangement of an inner drive member (2) and an outer drive member (3) enclosing the inner drive member (2), the inner and outer drive members (2,3) being rotatable relative to each other. The inner drive member (2) comprises at least two outward facing recesses (5, 6) and the outer drive member (3) comprises at least two inward facing recesses (8,9). Each outward facing recess (5,6) comprises a radially moveable roller member (10,11) of ferromagnetic material. The inner drive member (2) further comprises a magnetic biasing system (12) configured to magnetically bias the roller members (10,11) into the outward facing recesses (5,6). The bidirectional magnetic clutch further comprises a magnet actuator (13) at least partially circumferentially arranged around the outer drive member (3) and configured to maintain an engaged state or disengaged state of the bidirectional magnetic clutch.

A friction material comprising a Fe part; a coating layer formed over a surface of the Fe part; and a friction part formed on a surface of at least a part of the coating layer wherein: the coating layer comprises a first coating layer and a second coating layer in order from Fe part side, the first coating layer is constituted of an alloy containing Cu, Ni and Fe such that Fe content be not less than 10 atom %, the second coating layer is constituted of an alloy containing Cu and Ni, or an alloy containing Cu, Ni and Fe such that Fe content be less than 10 atom %, an average thickness of the first coating layer is not less than 1.0 μm and not more than 6.0 μm; and an average thickness of the second coating layer is not less than 9.5 μm and not more than 24.0 μm.

A brake rotor assembly can include a structural part having a receiving surface and at least one friction surface parts having a contact surface. The friction surface part can be fixably attached to the receiving surface of the structural part such that the contact surface faces away from the receiving surface of the structural surface to form at least part of an annular braking surface arranged concentrically around an axis of rotation of the structural part.

A friction material comprising: (a) at least one lubricant, wherein the at least one lubricant includes an amount of graphite, and wherein at least about 30 percent by weight of the graphite has a particle size of greater than about 500 microns using a sieve analysis; (b) at least one metal containing constituent for imparting reinforcement, thermal conductivity, and/or friction when the friction material is brought into contact with a movable member, wherein the at least one metal containing constituent includes iron and an iron containing compound; (c) a micro-particulated material; (d) one or more filler materials; (e) optionally at least one processing aid; (f) a balance being an organic binder, wherein the organic binder has less than 1 percent by weight of free phenol; wherein the friction material is free of asbestos and substantially devoid of copper.

The present disclosure relates a brake disc and a method of manufacturing the same, in which the depth of the coating layer containing a nitride is adjustable and corrosion resistance and wear resistance can be improved. A brake disc according to an embodiment of the present disclosure includes: a disc base material made of gray cast iron; and a coating layer formed on a surface of the disc base material and including a nitride produced as nitrogen is diffused into a ferrite matrix structure.

The invention relates to a brake drum assembly for braking at least one vehicle wheel that rotates about a rotation axis, the brake drum assembly comprising: a brake drum configured to rotate about the rotation axis and having a ring section extending circumferentially about the rotation axis and an end wall section extending at an angle to the rotation axis, the brake drum having an inner surface bounding at least part of a receiving space of the brake drum; at least one brake dust collector that faces an outer surface of the brake drum, wherein the brake drum comprises at least one through-hole providing a path through which brake dust can move from the receiving space to the dust collector.

A sintered friction material includes a copper component in an amount of 0.5% by mass or less, a titanate as a matrix, a ceramic material, and a lubricant. A method for manufacturing a sintered friction material includes a step of mixing raw materials including a titanate for forming a matrix, a step of molding the raw materials, and a step of sintering a molded body molded in the molding step. In the method, a sintering temperature in the sintering step is 900° C. to 1300° C.

A bidirectional magnetic clutch for an additive manufacturing system, comprising a concentric arrangement of an inner drive member (2) and an outer drive member (3) enclosing the inner drive member (2), the inner and outer drive members (2,3) being rotatable relative to each other. The inner drive member (2) comprises at least two outward facing recesses (5, 6) and the outer drive member (3) comprises at least two inward facing recesses (8,9). Each outward facing recess (5,6) comprises a radially moveable roller member (10,11) of ferromagnetic material. The inner drive member (2) further comprises a magnetic biasing system (12) configured to magnetically bias the roller members (10,11) into the outward facing recesses (5,6). The bidirectional magnetic clutch further comprises a magnet actuator (13) at least partially circumferentially arranged around the outer drive member (3) and configured to maintain an engaged state or disengaged state of the bidirectional magnetic clutch.

An actuator unit (28) for a positively locking, switchable clutch or a brake comprises a shaft (18) which can be rotated with respect to a rotational axis (26), an actuator slide (30) for actuating the freewheel, wherein the actuator slide (30) is rotationally connected to the shaft (18) and can be moved relative to the shaft (18) in the axial direction between a first position and a second position, and an actuator (32) which is stationary at least in part and which moves the actuator slide (30) between the first position and the second position. The actuator (32) comprises a coil (42) which is stationary and which, in the energized state, generates a magnetic field, by way of which the actuator slide (30) can be moved out of the first position into the second position or vice versa. The coil (42) is not energized in the first and in the second position, wherein the actuator (32) fixes the actuator slide (30) in the first position and the second position. Also disclosed is a positively locking, switchable clutch or a brake for a motor vehicle drive train, with an actuator unit (28).