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US 2012/0067691 A1Published application
Sliding friction material
AssigneeTanaka Seimitsu Kogyo Co., Ltd.
InventorsTomoya Takata, Takayuki Sanga, Makoto Suda
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AssigneeTanaka Seimitsu Kogyo Co., Ltd.
InventorsTomoya Takata, Takayuki Sanga, Makoto Suda
Estimating the term…
For reduction in size and weight, friction materials aiming at a high coefficient of kinetic friction have been developed. However, friction materials with a high coefficient of kinetic friction may cause sticking to a sliding partner material and deteriorated feeling in operation in particular in the initial running-in period during the initial stage of use. Therefore, the use of friction materials with a high coefficient of kinetic friction has been restricted. Since such sticking to the sliding partner material is less likely to occur after experiencing an initial running-in period, developed was a friction material in a form that is effective in prevention of sticking during the initial running-in period. Among sliding surfaces 5 between the friction material 3 and the sliding partner material 7, only the initial sliding surface 5′, or only the initial sliding surface 5′ and the vicinity thereof are in contact during the initial running-in period, and the area in contact with the sliding partner material gradually increases over time to full-area contact, that is, full contact of the whole sliding surfaces 5. The above constitution provides a sliding friction material having excellent sticking resistance with excellent friction performance and abrasion resistance.
A sliding friction material characterized by that sliding surfaces thereof are only partially in contact with the sliding surface of a sliding partner material at the beginning of use and by that the area in contact with the sliding partner material gradually increases over time to full-area contact during the initial running-in period.
A sliding friction material characterized by that sliding surfaces thereof are only partially in contact with a sliding surface of the sliding partner material at the beginning of use and by that the area in contact with the sliding partner material gradually increases over time to full-area contact during the initial running-in period, the relative angle of the sliding surfaces of the sliding friction material to the sliding surface of the sliding partner material before the initial running-in period being 1 to 20 minutes, the surface of the sliding friction material having a circumferential groove, the axial width of a land including a site having contact with the sliding surface of the sliding partner material first being 0.1 to 0.7 mm, the sliding friction material comprising 5 to 40 wt % of phenolic resin relative to the whole sliding friction material, and further comprising 30 to 80 wt % of carbon material, 5 to 40 wt % of inorganic fibers or inorganic particles, and if desired 5 to 40 wt % of metal fibers or metal particles, the total amount of the above-mentioned components being 100 wt % or less relative to the whole sliding friction material.
Dependencies are inferred from the claim text.