Segment type friction material
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United States of America Patent
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May 12, 2015
Grant Date -
Jul 12, 2012
app pub date -
Jul 27, 2010
filing date -
Sep 15, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A segment-type friction material comprises segment pieces each having a supply passage formed thereon to supply lubricating oil to a surface of each of the segment pieces. The segment-type friction material further comprises oil grooves each having an outer peripheral opening portion extended in a curved shape or a linear shape. Thereby, lubricating oil is sufficiently supplied to the surface of each of the segment pieces from an outer peripheral side thereof or an inner peripheral side thereof and a clearance between the segment-type friction material and its associated separator plate is assured. Moreover, a space for the lubricating oil to flow through an outer periphery is sufficiently assured and a drag torque is reduced.
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