A friction material, such as those belonging to the NAO or LS classes. The friction material is substantially free from copper and includes non-spherical particles in the form of powders and/or fibres each constituted by a preferably ferrous metallic core and by an at least partial coating of core formed at least partially or totally by tin and/or tin compounds, such as intermetallic Fe—Sn compounds.

The present invention relates to a frictional part (2) for a frictionally acting device comprising an annular friction surface (26), which has an inner edge (34) and an outer edge (36), wherein a circumferential groove (42) which extends in a zig-zag or undulating fashion between radially interior and radially exterior deflection points (44, 46), a plurality of outer grooves (64, 70) which each have an outer opening (66, 72) at the outer edge (36) and open into the circumferential groove (42) at opening points (68, 74) between the deflection points (44, 46), and a plurality of inner grooves (56, 60) which each have an inner opening (58, 62) at the inner edge (34) and open into the circumferential groove (42) between the opening points (68, 74), are provided in the friction surface (26). The outer opening (66, 72) of at least one of the outer grooves (64, 70) has a groove cross section which is larger than a groove cross section of the inner opening (58, 62) of at least one of the inner grooves (56, 60).

The present invention relates to a frictional part (2) for a frictionally acting device comprising an annular friction surface (26), which has an inner edge (34) and an outer edge (36), wherein a circumferential groove (42) which extends in a zig-zag or undulating fashion between radially interior and radially exterior deflection points (44, 46), a plurality of outer grooves (64, 70) which each have an outer opening (66, 72) at the outer edge (36) and open into the circumferential groove (42) at opening points (68, 74) between the deflection points (44, 46), and a plurality of inner grooves (56, 60) which each have an inner opening (58, 62) at the inner edge (34) and open into the circumferential groove (42) between the opening points (68, 74), are provided in the friction surface (26). The outer opening (66, 72) of at least one of the outer grooves (64, 70) has a groove cross section which is larger than a groove cross section of the inner opening (58, 62) of at least one of the inner grooves (56, 60).

A method in which at least one piezoceramic sensor and an electric circuit to collect an electric signal emitted by the piezoceramic sensor when subjected to a mechanical stress and possibly processing it are made as an electrically insulated unit. The unit is equipped with at least a branching ending with respective electric contacts and having the connected at least one piezoelectric sensor. The electric circuit and the at least one sensor are mechanically fixed integral with a first surface of a supporting metal element of a brake pad. Branching is formed so as to position the at least one piezoelectric sensor at a predetermined point of the first surface.

A method in which at least one piezoceramic sensor and an electric circuit to collect an electric signal emitted by the piezoceramic sensor when subjected to a mechanical stress and possibly processing it are made as an electrically insulated unit. The unit is equipped with at least a branching ending with respective electric contacts and having the connected at least one piezoelectric sensor. The electric circuit and the at least one sensor are mechanically fixed integral with a first surface of a supporting metal element of a brake pad. Branching is formed so as to position the at least one piezoelectric sensor at a predetermined point of the first surface.

A floating-caliper disc brake of a utility vehicle includes a brake disc, a brake carrier spanning the brake disc and having lining shafts arranged on both sides of the brake disc, a brake caliper overlapping the brake disc and movable relative to the brake carrier, brake linings arranged on both sides of the brake disc in a lining shaft of the brake carrier, and having a lining carrier plate and a friction lining attached thereto. An application-side brake lining can be pressed against the brake disc by an application device and a reaction-side brake lining can be pressed against the brake disc by a brake caliper back, by moving the brake caliper. The brake caliper can be reset by a resetting device along a wear adjustment path in an axial direction to the axis of rotation of the brake disc. With the same volume of the friction linings in the new condition, the friction lining thickness of the reaction-side brake lining is not the same as the friction lining thickness of the application-side brake lining (5).

A floating-caliper disc brake of a utility vehicle includes a brake disc, a brake carrier spanning the brake disc and having lining shafts arranged on both sides of the brake disc, a brake caliper overlapping the brake disc and movable relative to the brake carrier, brake linings arranged on both sides of the brake disc in a lining shaft of the brake carrier, and having a lining carrier plate and a friction lining attached thereto. An application-side brake lining can be pressed against the brake disc by an application device and a reaction-side brake lining can be pressed against the brake disc by a brake caliper back, by moving the brake caliper. The brake caliper can be reset by a resetting device along a wear adjustment path in an axial direction to the axis of rotation of the brake disc. With the same volume of the friction linings in the new condition, the friction lining thickness of the reaction-side brake lining is not the same as the friction lining thickness of the application-side brake lining (5).

A vehicle brake system is provided that includes (or is formed from) a back plate configured to support a composite pad, at least one conditioning insert coupled to the back plate and configured to contact a surface of a wheel during a braking event and thereby to condition at least a portion of the surface of the wheel, and fins coupled with the at least one conditioning insert and configured to conduct heat generated by contact of the at least one conditioning insert with the at least the portion of the surface of the wheel away from the at least one conditioning insert.

Provided is a method for manufacturing a brake pad used in a brake of a vehicle, which is capable of improving a limitation of separation of a friction material and a back plate of the brake pad. The method for manufacturing the brake pad includes manufacturing an intermediate plate and integrally pressing and molding a back plate and a friction material on both surfaces with the intermediate plate manufactured in a mold therebetween so that the back plate and the friction material are integrally coupled to each other by using the intermediate plate as a medium to manufacture the brake pad.

Provided are a wet friction plate and a wet multiplate clutch device including the wet friction plates capable of improving the performance for discharging lubricant oil adhering to surfaces of friction members. A wet friction plate includes oil grooves and friction members on a flat plate annular core metal. At a surface of a porous layer of the friction member, a friction slide surface and lubricant oil recessed portions are formed. The lubricant oil recessed portion has no sharp portion in a pointed shape, such as a corner portion, and is formed with a smooth continuous surface. The multiple lubricant oil recessed portions depressed in a recessed shape with respect to the friction slide surface are formed. In the porous layer, hollow portions are formed to have the same formation rate between a portion forming the friction slide surface and a portion forming the lubricant oil recessed portion.