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Hydraulic fan assembly for an engine ventilation system

  • US 8,939,733 B2
  • Filed: 06/22/2011
  • Issued: 01/27/2015
  • Est. Priority Date: 06/22/2011
  • Status: Active Grant
First Claim
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1. A centrifugal fan for use with a source of hydraulic fluid, the fan comprising:

  • a fan housing including a first side wall defining an inlet and a second side wall spaced from the first side wall, the fan housing further defining an outlet;

    a hydraulic motor coupled to the second side wall of the fan housing, the hydraulic motor including;

    a motor housing;

    a hydraulic chamber disposed in the motor housing and fluidly communicating with the source of hydraulic fluid;

    a rotatable motor shaft extending along a shaft axis, the motor shaft having an axially rearward end hydraulically coupled to the hydraulic chamber and an axially forward end disposed in the fan housing;

    a shaft seal disposed between the motor housing and the motor shaft;

    an impeller assembly coupled to the axially forward end of the motor shaft;

    a baffle which is stationary disposed between the first and second side walls of the fan housing, the baffle including a planar baffle outer portion and a non-planar baffle inner portion defining a baffle inner edge disposed axially between the impeller assembly and the second wall, the baffle inner portion extending toward the first wall of the fan housing; and

    a deflector disc coupled to and rotating with the impeller assembly, the deflector disc including a planar deflector disc inner portion, and a non-planar deflector disc outer portion extending toward the second wall of the fan housing and defining a deflector disc outer edge positioned axially rearward of the baffle inner edge.

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