Fluid coupling device, bimetal clip and method of assembly therefor
Electro-viscous fan clutch
Viscous fluid clutch and reservoir by-pass valve therefor
Closed loop pulse modulated viscous fan control
Fluid return channels for a cover of a viscous fluid clutch
Temperature sensitive fluid-type fan coupling device
Electromagnetically controlled hydraulic clutch
Fluid coupling and external control therefor
Heavy duty viscous fan drive and bracket mounting assembly therefor
ApplicationNo. 10287325 filed on 11/04/2002
US Classes:192/58.61, Magnetic or electric192/58.8Specific valve
ExaminersPrimary: Lorence, Richard M.
Attorney, Agent or Firm
International ClassF16D 3502
AbstractAn electronically-controlled viscous fan drive having a one-piece accumulator and reservoir located on the top side of the clutch. The accumulator also has a low pressure and high pressure fill hole for allowing movement of viscous fluid from the reservoir to a anti-bleedback chamber and into the operating and working chamber of the coupling during normal operation. A radially balance valve disk having a step up feature coupled to a spring and an actuator electronically controls movement of viscous fluid from the reservoir to the anti-bleedback chamber through the fill holes by energizing or deenergizing the spring based on engine operating conditions. The valve disk may be a one-piece or two-piece design. The accumulator is designed to prevent morning sickness associated with the flow of viscous fluid from the reservoir to the operating chamber during engine off situations.