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Rotary valve for single-point coolant diversion in engine cooling system

  • US 6,539,899 B1
  • Filed: 02/11/2002
  • Issued: 04/01/2003
  • Est. Priority Date: 02/11/2002
  • Status: Expired due to Term
First Claim
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1. A rotary valve for single-point coolant switching of coolant flowing in an engine cooling system, comprising:

  • a valve body having an inlet port and a plurality of outlet ports, said outlet ports including a radiator port for allowing coolant flow in a radiator circuit, a bypass port for allowing coolant flow in a bypass circuit, and a heater port for allowing coolant flow in a heater circuit;

    a flow diverter rotationally received in said valve body and including a plurality of fluid passages providing predetermined flow paths between said inlet port and said outlet ports in response to a rotational position of said flow diverter; and

    an actuator responsive to a control signal for setting said rotational position;

    wherein said predetermined flow paths include a first mode for distributing said coolant to said radiator port and said heater port while blocking coolant from said bypass port, a second mode for distributing said coolant to said bypass port while blocking coolant from said radiator port and said heater port, a third mode for distributing said coolant to said heater port while blocking coolant from said radiator port and said bypass port, and a fourth mode for distributing said coolant to said radiator port and said bypass port while blocking coolant from said heater port; and

    wherein said first mode corresponds to a failsafe position for said flow diverter if said actuator fails, said rotary valve further comprising a return mechanism for biasing said flow diverter to said failsafe position.

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