192 clutches and power-stop control – Clutches – Fluent material
Reexamination Certificate
2008-01-15
2008-01-15
Burch, Melody M. (Department: 3683)
192 clutches and power-stop control
Clutches
Fluent material
C192S058800, C192S058660
Reexamination Certificate
active
09758538
ABSTRACT:
A drive for a cooling fan at motor vehicles including a main cooling circuit and at least one secondary cooling circuit using a fluid friction clutch including a control element for the drive of the cooling fan is described.In case of a plurality of cooling circuits, such fluid friction clutches do not react as desired by actuating the cooling fan.To prevent this disadvantage, a drive for a cooling fan being drivable by a fluid friction clutch is to be provided, in which the cooling fan starts operation as soon as there is a requirement in at least one of the cooling circuits.For this reason, temperature sensors are allocated to selected secondary cooling circuits and further control element is allocated to the working chamber to bypass the control element, the control element freeing a further opening being located in the separating wall when predetermined temperatures and temperature ranges, respectively, are attained in at least one of the selected secondary cooling circuits, the opening not being influenced by the control element.
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Heinle Hans
Leutner Siegfried
AGCO GmbH & Co
Burch Melody M.
MacMillan Sobanski & Todd LLC
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