Disclosed is a wet friction member for use in a wet clutch that can achieve an increased coefficient of static friction (μs) between it and a counterpart surface in frictional contact with it. The wet friction member includes base paper that is formed using a fiber base material and a filler, and a binder for curing the base paper. The filler includes rubber particles made of at least one kind of highly lipophilic rubber material. The rubber particles contains carbon black for reinforcement.

A friction material for a clutch pad comprising: a plurality of fibers; and, a filler material including at least 0.1% and at most 100% silica rich carrier particles by weight based on total weight of the filler; the silica rich carrier particles having: a median particle size of at least 0.1 μm and at most 50 μm; and, a median pore diameter of at least 0.1 and at most 10 μm.

A thermo-set resin composition comprising a Quebracho wood tannin extract, a furfuryl alcohol, a neoprene compound, a dimethicone, polyethylene glycol, abrasive particles, and a glycerol phosphate acidic ester and/or graphite. Further, a method of preparing the thermo-set resin composition including mixing Quebracho wood tannin extract with a furfuryl alcohol to form a primary mixture, adding additives and abrasive particles to the primary mixture, and reacting the primary mixture by adding a catalyst. The thermo-set resin composition is molded into a shape under heat and pressure to a Brinell hardness 8.5 daN/mm.sup.2 and 48 daN/mm.sup.2 and can be incorporated into a friction pad of a brake pad.

Provided axe porous titanate compound particles capable of giving excellent fade resistance when used in a friction material, a resin compound and a friction material each containing the porous titanate compound particles, and a method for producing the porous titanate compound particles. Porous titanate compound particles are each formed of titanate compound crystal grains bonded together and have a cumulative pore volume of 5% or more within a pore diameter range of 0.01 to 1.0 μm.

A friction material composition includes a binder, organic filler, inorganic filler and fiber reinforcement, and does not contain copper or contains copper in an amount of 0.5 mass % or less. The inorganic filler is one or more selected from y alumina having an average particle size of 10 nm to 50 μm, dolomite having an average particle size of 1 to 20 μm, calcium carbonate having an average particle size of 1 to 20 μm, magnesium carbonate having an average particle size of 1 to 20 μm, manganese dioxide having an average particle size of 1 to 20 μm, zinc oxide having an average particle size of 10 nm to 1 μm, magnetite having an average particle size of 1.0 μm or less, cerium oxide having an average particle size of 0.5 to 5 μm, and zirconia having an average particle size of 5 to 50 nm.

A friction material composition that does not contain copper, which has a high environmental load, or containing copper in such small amount as to be not more than 0.5 mass % and that enables decrease in brake vibration in braking at high temperatures when used in a friction material such that for an automobile disc brake pad, is provided. A friction material obtained by molding the friction material composition is also provided. The friction material composition contains a binder, an organic filler, an inorganic filler, and a fibrous base material, and the friction material composition contains no copper as an element or contains not more than 0.5 mass % of copper, and also contains 2 to 5 mass % of steel fibers that have fiber lengths of 2500 μm or less.

A wet friction material for use in a wet clutch includes a friction interfacing surface for experiencing frictional engagement with an opposed surface in the presence of a lubricant. At least a portion of the friction interfacing surface comprises fibrillated nanofibers, which define a nanofibrous web, and friction adjusting particles held by the nanofibrous web. A cured resin may adhere the fibrillated nanofibers and the friction adjusting particles to provide structural support for the friction material.

A conditioning insert of a friction device includes a body having a conditioning surface configured to engage a wheel, opposite first and second sides intersecting the conditioning surface, and opposite third and fourth sides intersecting the conditioning surface. Each of the first and second sides extend from the third side to the fourth side. The body includes one or more of (a) a recess extending into one or more of the first side, the second side, the third side, or the fourth side and is configured to receive friction material of the friction device and/or (b) a protrusion extending out of the first side, the second side, the third side, or the fourth side and into the friction material of the friction device.

A friction material for a brake pad comprises a fibrous base material without a metal fiber, and comprises a binder and a friction modifier. The friction material comprises 0.3% to 2.0% by weight, relative to the entire friction material, of a non-crosslinkable polyolefin having a melting point higher than the melting temperature of the binder. The friction material can suppress increase in friction coefficient of a friction material during initial brake operation and reduce the occurrence of abnormal effects and squealing in low-temperature and high-humidity environments.

In relation to the NAO friction material free of copper component, this invention is to provide the friction material that prevents the occurrence of metal catch while securing sufficient wear resistance. In the friction material manufactured by forming the NAO friction material composition which is free of copper component, the above-described friction material composition does not contain metal simple substance or alloy and contains, as the lubricant, metal sulfide having 600 centigrade or higher decomposition temperature to be decomposed into metal and sulfur, 2.0-5.0 weight % of graphite and a zirconium silicate as an abrasive material. Here, the metal sulfide is not a molybdenum disulfide or a tungsten disulfide. Especially, the content of the metal sulfide is preferably 0.5-2.0 weight % relative to the total amount of the friction material composition.