The present invention provides a sintered metal friction material that has excellent wear resistance, heat resistance even at high load and has a higher friction coefficient while maintaining a friction coefficient and wear resistance that are hard to decrease, and has a reduced content of copper of less than 5 mass %. There is provided a sintered metal friction material characterized in that the sintered metal friction material comprises a sintered material of a friction material composition, the friction material composition comprises matrix metals and a friction modifier, the matrix metals comprise following 20 to 40 mass % of iron powder, 20 to 40 mass % of nickel powder, 0.5 to 10 mass % of zinc powder, 0.5 to 5 mass, of tin powder, 0.5 to 4 mass % of copper powder and 0.5 to 5 mass % of sintering assist powder.

A friction plate (1.sub.1) includes a plate (1A) with a disc shape and a friction material (F1, F2) that is fixed to aside face (1a) of the plate (1A). The friction material (F1, F2) is disposed so that one or both of an inner peripheral side and an outer peripheral side is nonuniform in an inner and outer peripheral direction with respect to a circumferential direction around a center (CT1) of the plate (1A). Thus, there is an increase in the amount of lubrication oil that is fed to a surface of friction material segments (F1, F2) and there is an increase in a separation force in an axial direction between a friction plate (1.sub.1) and a separator plate or an end plate.

Various systems, devices, and methods for a vehicle smart brake pad comprising a sensor such as a force sensing device, and a production process thereof. For example, a production process of a vehicle brake pad can include the following steps in time sequence: applying an electrical circuit a support plate; screen printing on the electrical circuit of at least a first electrode; screen printing on the at least first electrode of a sheet of piezoelectric material; screen printing on the sheet of at least a second electrode; applying a friction pad on the support plate; and bulk polarizing the sheet of piezoelectric material by a supply of power to the at least first and second electrodes.

A disc brake rotor comprises a hub engagement member, a friction member, a first member, and a second member. The hub engagement member is configured to engage with a hub assembly. The friction member is provided radially outwardly of the hub engagement member with respect to a rotational center axis of the disc brake rotor. The friction member has an axial thickness in an axial direction with respect to the rotational center axis. The first member extends between the hub engagement member and the friction member. The first member includes a recess that has an axial depth in the axial direction. The axial depth is larger than the axial thickness of the friction member. The second member is at least partly provided on the recess without using a screw connection.

A friction material according to an embodiment is a friction material including: copper in an amount of 0.5 wt % or less; an inorganic material having a cleavage property in an amount of 10 wt % to 20 wt %; a first abrasive material having a Mohs hardness of 6.5 or more and less than 7 and a second abrasive material having a Mohs hardness of 7 or more and 8 or less in an amount of 0.2 wt % to 3 wt %.

An improved friction material is described, comprising a binding composition based on a hydraulic binder, and its use in brake pads and industrial applications.

A disc brake is proposed having a brake calliper (1) which reaches over a brake disc (2) and brake linings (3) which are arranged on the two sides thereof and are composed in each case of a friction lining (4) and a rear plate (5), and having a hold-down (7) which runs transversely over the brake linings (3) and is supported against the brake linings towards the disc brake axis (A). The circumferential contour of the rear plate (5) of at least one of the brake linings is defined by an upper edge (21), a lower edge (22) and two side edges (23A, 23B) which extend between the upper and the lower edge. The circumferential contour of the friction lining (4) is also defined by an upper edge (31), a lower edge and two side edges which extend between the upper and the lower edge. In order to make a contribution to the solution of the problem of the structural tightness between the components of the disc brake and the vehicle wheel which rotates around the brake, the main course of the upper edges (21 and 31) of the rear plate (5) and the friction lining (4) where the hold-down (7) runs over the brake lining (3) is interrupted by a recessed portion (25 and 35) of the upper edge (21 and 31) in the direction of the brake disc axis (A).

An article includes a structural core, one or more friction pads, and a plurality of elongated fasteners. The structural core includes two core surfaces and a plurality of pockets extending between the core surfaces. Each friction pad includes a pad surface and a friction surface opposite the pad surface. Each pad surface includes a planar pad surface configured to contact the core surface and a plurality of bosses extending from the first planar pad surface and including a bore. Each planar pad surface is at least about 50% of a surface area of the respective first and second pad surfaces. The plurality of bosses engages with the plurality of pockets to position the respective first and second friction pads relative to the structural core. The plurality of elongated fasteners passes through bores of corresponding bosses of friction pads to fasten the friction pads to the structural core.

A method for making a brake disc may include providing a disc brake with a braking band and depositing on the disc a layer of chromium carbide and nickel-chromium in particle form to form a base protective coating. The method may also include depositing on the base protective coating a material in particle form consisting of tungsten carbide, iron, chromium and aluminium to form a surface protective coating made of tungsten carbide, iron, chromium and aluminium. Both protective coatings may be made by High Velocity Oxygen Fuel or High Velocity Air Fuel or Kinetic Metallization techniques.

A brake disk for a motor vehicle includes a friction ring and at least one insert portion. The insert portion is located within and arranged coaxially with the friction ring, and is configured so as to possess an annular disk shape and define a plurality of openings. The friction ring is configured such that material of the friction ring fills the plurality of openings.