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US 5,671,835 AGranted
Wet friction member
AssigneeDaido Metal Company Ltd.
InventorsTadashi Tanaka, Yoshikazu Mizuno, Mitsuru Sugita, Katsumi Sawano, Akira Ono
Life of this patent
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AssigneeDaido Metal Company Ltd.
InventorsTadashi Tanaka, Yoshikazu Mizuno, Mitsuru Sugita, Katsumi Sawano, Akira Ono
Estimating the term…
A wet friction member which can maintain boundary lubrication by decreasing the thickness of oil film on a friction surface even when the sliding velocity increases. In a case where the friction surface of the friction member is in pressure contact with a mated member while rotating in a state of boundary lubrications a shearing resistance owing to viscosity of cooling oil is circumferentially applied to cooling oil in outer grooves in the friction surface. Since outer grooves extend from starting position of intermediate portions of the friction surface and terminate at the outer peripheral edge in a volute shape toward the direction of rotation, cooling oil in the outer grooves flows along the groove walls and is quickly discharged from opening portions at the outer peripheral edge.
The combination of a wet friction member and a mated member, wherein the wet friction member is adapted to contact with or separate from the mated member while the mated member is rotating, said wet friction member having a base, a friction surface formed on the base and outer grooves formed on the friction surface each of which grooves extends from a starting position of intermediate portions of the friction surface and terminates onto the outer peripheral edge of the friction surface, said outer grooves being directed toward the direction of rotation of the mated member.
The combination of a wet friction member and a facing mated member, wherein the wet friction member is adapted to contact with or separate from the mated member facing the friction member while the mated member is rotating, comprising an annular base provided with an outer periphery and an inner periphery, a friction surface formed at least on one side of the base, and outer grooves formed on the friction surface each of which grooves has a volute shape, each of said outer grooves extending spirally from a start position of a radially intermediate portion of the base to a terminating position on the outer periphery of said base, the groove-extending direction of each of the grooves being directed toward the direction of rotation of the mated member.
The combination of a wet friction member and a facing mated member, wherein the wet friction member is adapted to contact with or separate from the mated member facing the friction member while the mated member is rotating, comprising
The combination of a wet friction member and a facing mated member, wherein the wet friction member is adapted to contact with or separate from the mated member facing the friction member while the mated member is rotating, comprising
A wet friction member adapted to sequentially contact with and separate from a rotating mated member in facing relationship to the friction member, said friction member comprising
A wet friction member adapted to contact with or separate from a rotating mated member, said wet friction member having a base, a friction surface formed on said base, outer grooves formed on the friction surface each of which grooves extends from a starting position of intermediate portions of the friction surface and terminates at the outer peripheral edge of the friction surface, and inner grooves formed on the friction surface each of which inner grooves is formed in a radially inner side of the friction surface and opened at the inner peripheral edge of the friction surface,
Dependencies are inferred from the claim text.