Power plants – Pressure fluid source and motor – Pulsator
Reexamination Certificate
2007-05-22
2007-05-22
Leslie, Michael (Department: 3745)
Power plants
Pressure fluid source and motor
Pulsator
C251S120000
Reexamination Certificate
active
11129863
ABSTRACT:
A pressure-limiting device in the hydraulic path for a clutch including at least one restrictor member having a central restrictor bore for pressure reduction and a cup-shaped retaining ring to which pressure is applied by a spring and the bottom of which has a central bore and, radially spaced therefrom, a plurality of radially spaced openings arranged on a reference circle. At least one of the restrictor member and the central restrictor bore is activatable when a predetermined volumetric flow rate of the fluid is exceeded during clutch engagement and the plurality of radially spaced openings is closable when a predetermined pressure drop is exceeded. The central restrictor bore can be activated independently of temperature because the surface area acting on the retaining ring is smaller in the unshifted state than during shifting, resulting with the temperature-dependent pressure losses caused by leakage between the retaining ring and housing being compensated for.
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Davidson Davidson & Kappel LLC
Leslie Michael
Luk Lamellen und Kupplungsbau Beteiligungs KG
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