专利名称：Dual stage engagement for viscous fluid
coupling
发明人：Bopp, Warren Gerald申请号：EP81110801.8申请日：19811228公开号：EP0055854A1公开日：19820714
专利附图：
摘要：A viscous fan clutch (10) is typically employed in a fan drive mechanism within atruck or automobile. A shaft (12) driven by the engine, rotates a clutch member (24)within the fan drive. The clutch member is arranged for fluid engagement with a cover
assembly (38) for the transmission of torque thereto when the fluid is disposed in anoperating chamber (70) defined by complementary shear surfaces (30, 31, 56, and 57) inthe clutch and cover. During relative rotation between the clutch and cover, fluid ispumped from the operating chamber to primary (76) and secondary (77) fluid storagechambers. Independent fluid temperature responsive control valves (120 and 190)provide for selective communication between the storage chambers and the operatingchamber to effect modulation of the total fluid flow whereby dual speed operation ofthe clutch is achieved. In the preferred embodiment, one of the valves operates inresponse to impinging ambient air at a relatively low temperature and the other valveoperates in response to sensed engine coolant temperature at a relatively hightemperature.
申请人：EATON CORPORATION
地址：100 Erieview Plaza Cleveland Ohio 44114 US
国籍：US
代理机构：Schwan, Gerhard, Dipl.-Ing.
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