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Overheat preventing device for motor vehicle engine

  • US 3,894,521 A
  • Filed: 12/04/1973
  • Issued: 07/15/1975
  • Est. Priority Date: 12/05/1972
  • Status: Expired due to Term
First Claim
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1. An overheat preventing device in a motor vehicle having an engine, a radiator through which a pump circulates engine coolant, a condenser for an air conditioner comprising;

  • a fan;

    a one-way clutch;

    a first pulley on a shaft supported by the engine and engeable with said fan through said one-way clutch; and

    fan being normally rotated from the engine shaft through said one-way clutch, when engaged, and a first V-velt means to air cool the contents of the radiator and the condenser;

    an electric motor with a motor shaft;

    a second pulley mounted freely rotatably on said motor shaft;

    a third pulley fixedly mounted on said fan;

    a clutch means fixedly mounted on said motor shaft and engageable with said second pulley for said second pulley to be rotatable with said motor shaft;

    said fan being rotatable by said electric motor through said second pulley when engaged by said clutch, a second V-belt and said third pulley;

    an ignition switch and a first control switch means connected in series between said motor and a battery, said first control switch means closing to energize said motor when one of the temperature in said radiator, the temperature and pressure in said condenser reaches a predetermined value and the vehicle speed decreases below a predetermined value;

    a second control switch means, a delay switch and a thermosensitive switch also connected in series between said motor and the battery and in parallel with said ignition switch and said first control switch means being closed when said ignition switch is opened, and said thermosensitive switch closing only when the ambient temperature is above a predetermined level to energize said motor for a predetermined period through said delay switch and said second control switch means when said ignition switch is open.

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