A brake disc for a bicycle comprising a first component made of a first material and having a braking track configured to cooperate with brake pads. A second component is made of a second material and having (i) a radially inner annular portion for coupling with a hub of a bicycle wheel and (ii) a plurality of radially outer portions for connecting to said first component at a respective plurality of connection portions of said first component. The first component further comprises a radially inner annular portion connected to said braking track, and the brake disc comprises axial locking members active on the radially inner annular portions of the first and of the second component to keep said radially inner annular portions of the first (30) and of the second component under mutual pressure.

A brake disc having a first component made of a first material, a braking track configured to cooperate with brake pads, and a second component made of a second material and having (i) a radially inner annular portion for coupling with a hub of a bicycle wheel and (ii) a plurality of radially outer portions for connecting to said first component at a respective plurality of connection portions of said first component. The first component comprises a plurality of connection arms that extend from said braking track towards said predetermined rotation axis (X) and that are distinct from said plurality of connection portions, wherein at least one of said connection arms of said first component and at least one of said radially outer connection portions of said second component are coupled together through at least one shape coupling.

A braking band having an annular band body arranged around a rotation axis and made of one of gray cast iron, steel, aluminum or alloys thereof, has at least one braking surface having an activated band body portion for increasing adhesive capacity of at least one protective surface coating placed on the surface of the activated band body portion and having at least one material with elevated resistance to abrasion. The activated band body portion is arranged on the surface of the annular band body to form an outermost layer of the braking band with the at least one protective surface coating and has a rough profile having at least one channel delimited by at least one pair of projections, extending along a path at least partially surrounding the rotation axis and having a channel bottom and a first channel side forming an acute angle with the channel bottom and an opposite second channel side forming an obtuse angle with the channel bottom.

A wet friction disc includes a friction surface and a lubrication groove through which a lubricant supplied to the friction surface flows. The lubrication groove has a plurality of circumferential groove portions that extends in a circumferential direction and a plurality of intersecting groove portions that extends in directions intersecting the circumferential direction. At least one of the circumferential groove portions has a through-hole that extends through the wet friction disc between an opposite surface facing s mating member and a surface on the opposite side in an axial direction.

Brake pads are prepared using a LS (Low Steel) or NAO (Non-Asbestos Organics) type friction material formulation and at least one friction surface of a brake disc intended to cooperate in use with a brake pad that is coated with an anti-wear and anti-corrosion coating with adequate plasticity in order to have a reduced propensity to form micro-cracks under conditions of tribo-mechanical stress, chosen from the amongst the group consisting in: particles of chromium carbide (Cr.sub.3C.sub.2) dispersed within a metallic matrix consisting of an alloy of NiCr; particles of a combination of several metallic materials in order to create a metallic compound consisting of an alloy of FeNiCrMoSiC (iron-nickel-chromium-molybdenum-silicon-carbon).

A brake drum for utility vehicles configured to mount rotatably about an axis of rotation and including a friction section and a connection section, wherein the friction section includes a friction surface and a plurality of transmission structures, wherein the connection section comprises at least one mounting surface and a plurality of transfer structures, wherein the transfer structures engage positively and/or nonpositively in the respective complementary transmission structures so that a torque about the axis of rotation can be transmitted positively, and wherein the mounting surface serves to fix the brake drum indirectly or directly to a hub.

A brake disc for a railway vehicle includes: a disc plate portion that has a sliding portion of a front face; a plurality of radial fins that are provided on the rear face of a disc plate portion, and that have a shape that extends in the radial direction of the disc plate portion; and a circumferential rib that is provided between each pair of adjacent radial fins, and that has a shape that extends in the circumferential direction of the disc plate portion. A flow path for air is formed between the pair of radial fins, and the flow path for air is narrowed by the circumferential rib. On the circumferential rib, a gradual slope for suppressing fluctuations in an airflow that passes between the pair of radial fins is provided from a base part to a top part.

A drum brake apparatus includes: a housing; a main braking unit disposed on a first portion of the housing, and the main braking unit configured to be, during main braking, driven by a hydraulic pressure and pressing a shoe; a parking braking unit disposed on a second portion of the housing, the parking braking unit configured to be, during parking braking, driven by an electromotive force of an actuator and pressing the shoe; a first locking member configured to couple the housing to one surface of a back plate; and a second locking member configured to couple the actuator to the housing on another surface side of the back plate.

A brake rotor for a bicycle has a brake body formed of a first material and a cooling element with a cooling body, at least part of which is formed of a second material that has a higher thermal conductivity than the first material. The brake body has a generally annular shape with a first axial contact surface. The cooling body is coupled to the first axial contact surface. The cooling body may be in contact with the first axial contact surface around the brake body for a majority of a circumference of the heat dissipation region. The cooling body may be attached to or be an integral part of a carrier coupled to the brake body.

The present disclosure relates to a brake disc including a braking part having a circular plate shape having a hollow portion and a plurality of coupling portions protruding and extending from an inner diameter surface thereof, and a hat part disposed in the hollow portion and having a plurality of insertion portions protruding laterally, in which the plurality of coupling portions is respectively coupled to the plurality of insertion portions, and the coupling portion of the braking part and the insertion portion of the hat part are joined to only one of an outboard portion or an inboard portion of the braking part. According to the present disclosure, it is possible to reduce noise occurring at a position at which the hat part and the braking part are coupled to each other and improve cooling performance.