An automatic parking brake for a truck mounted brake cylinder. The automatic parking brake includes rod that is interconnected to a piston of the brake cylinder and can prevent the piston from returning to the brakes releases position. The rod is controlled by locking nut that will rotate if the rod moves axially through the locking nut and a locking sleeve that is moveable between a locked position, where the locking sleeve engages the locking nut and prevents from the nut from rotating, and a released position, where the locking sleeve is disengages from the locking nut and the locking nut is free to rotate. A spring provides a force biasing the locking nut into the locked position, and brake pipe pressure biases the locking sleeve into the released position.

A brake control system for a vehicle, the brake control system including a master cylinder, a brake line for communicating brake fluid between the master cylinder and a brake, a fluid reservoir in fluid communication with the brake line during non-braking conditions, and means for selectively moving brake fluid into and/or out of the fluid reservoir. The means for selectively moving brake fluid into and/or out of the fluid reservoir includes means for removing gas from the fluid reservoir, and is configured to move brake fluid into the fluid reservoir, so that brake fluid is moved along the brake line in a direction towards the master cylinder, during non-braking conditions. Upon receiving a signal of an anticipated brake event, brake fluid may also be moved out of the fluid reservoir, so that brake fluid is moved along the brake line in a direction away from the master cylinder.

Example brake pads and methods of manufacturing brake pads are disclosed. An example brake pad for use with a rotor of a disc brake assembly includes a curved substrate. The brake pad also includes a plurality of grooves in the curved substrate, the plurality of grooves defining a plurality of contact surfaces, wherein the plurality of grooves extend radially with respect to a rotational axis of the rotor.

Example brake pads and methods of manufacturing brake pads are disclosed. An example brake pad for use with a rotor of a disc brake assembly includes a curved substrate. The brake pad also includes a plurality of grooves in the curved substrate, the plurality of grooves defining a plurality of contact surfaces, wherein the plurality of grooves extend radially with respect to a rotational axis of the rotor.

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).

The invention relates to a wet-running multi-plate clutch (1) comprising a number of inner plates (2) and a number of outer plates (3), and a first friction lining (6) is disposed on either side of every inner plate (2) respectively and a second friction lining (8) is disposed on either side of every outer plate (3) respectively, and the first friction linings (6) are located entirely underneath the second friction linings (8) in the radial direction so that the first friction linings (6) move into frictional contact with the outer plate main bodies (7) when the multi-plate clutch (1) is engaged and the second friction linings (8) move into frictional contact with the inner plate main bodies (5) when the multi-plate clutch (1) is engaged. The first friction linings (6) respectively have at least one first groove (13) with a groove depth of up to 100% of a friction lining thickness of the first friction linings (6) and the second friction linings (8) have no or respectively have at least one second groove (16) which has a smaller cross-sectional surface area, as viewed in the longitudinal extension of the second grooves (16), than the first grooves (13) as viewed in the same direction.

A carbon-carbon composite preform including a plurality of layers including carbon fibers or carbon-precursor fibers, the layers include a first exterior layer defining a first major surface, a second exterior layer defining a second major surface, and at least one interior layer disposed between the first exterior layer and the second exterior layer, the at least one interior layer having a peripheral region that forms a portion of an outer surface of the preform. The preform includes needled fibers, where at least some needled fibers extend through two or more layers. The preform has an exterior region and a core region, where the exterior region includes at least the peripheral region of at least one interior layer. The needled fibers define a first needled fiber number density (NFND) in the exterior region and a second greater NFND in at least a portion of the core region.

A wet friction member includes a core plate formed in a flat ring shape; and a friction part arranged on a main surface of the core plate. The friction part is formed in such a manner that four kinds of segment pieces, which are a first piece, a second piece, a third piece, and a fourth piece, are repeatedly arranged in this arrangement order in a ring shape via oil grooves

A wet friction member includes a core plate formed in a flat ring shape; and a friction part arranged on a main surface of the core plate. The friction part is formed in such a manner that four kinds of segment pieces, which are a first piece, a second piece, a third piece, and a fourth piece, are repeatedly arranged in this arrangement order in a ring shape via oil grooves