Fan shroud aspirator

An aspirator for a fan shroud surrounding a vehicle cooling fan having a plurality of blades which rotate in a rotation direction about an axis to cause air to move through a radiator, the aspirator having a housing defining an opening exposed to air moved by the fan, a port for connecting to a vehicle function and a duct for extending from the opening to the port, characterized by:

• the aspirator housing having a flange which projects from one side of the duct, the flange projecting from the duct generally in said rotation direction and the flange comprising a flat member which is substantially parallel to a plane of rotation of the fan.

An aspirator for a fan shroud surrounding a vehicle cooling fan having a plurality of blades which rotate in a rotation direction about an axis to cause air to move through a radiator, the aspirator having a housing defining an opening exposed to air moved by the fan, a port for connecting to a vehicle function and a duct for extending from the opening to the port, characterized by:

• the duct having a triangular cross sectional shape with an apex which projects in a direction which is upstream with respect to flow of air moved by the fan.

An aspirator for a fan shroud surrounding a vehicle cooling fan having a plurality of blades which rotate about an axis to cause air to move through a radiator, the blades having outer ends which define a cylindrical envelope, each blade having a leading edge and a trailing edge, these edges being substantially parallel to each other and having projections on a plane perpendicular to the axis of rotation of the blades which are separated by a distance B, the fan shroud having a generally cylindrical wall which surrounds the fan and which is positioned radially outwardly with respect to the cylindrical envelope, the aspirator having a housing defining an opening exposed to air moved by the fan and a port for connecting to a vehicle function, the aspirator housing has a longitudinal axis which forms an acute angle with respect to a plane which is tangent to the cylindrical wall of the shroud, characterized by:

• the aspirator housing having an edge facing generally opposite to a direction of rotation of the fan blade, said housing edge having a projection on said plane which is parallel to the projection of the leading edge of the fan blade when the projection of the leading edge is spaced apart from the housing edge by a distance C, a ratio of C to B being between 1.15 and 0.67.

An aspirator for a fan shroud surrounding a vehicle cooling fan having a plurality of blades which rotate about an axis to cause air to move through a radiator, the blades having outer ends which define a cylindrical envelope, the fan shroud having a generally cylindrical wall which surrounds the fan and which is positioned radially outwardly with respect to the cylindrical envelope, the aspirator having a housing defining an opening exposed to air moved by the fan and a port for connecting to a vehicle function, the aspirator housing forming a duct which extends from the opening to the port, the aspirator housing having a longitudinal axis which forms an acute angle with respect to a plane which is tangent to the cylindrical wall of the shroud, characterized by:

• the aspirator housing having a flange which projects from one side of the duct, the flange projecting from the duct generally in a direction parallel to a rotation direction of the fan and substantially parallel to a plane of rotation of the fan.

An aspirator for a fan shroud surrounding a vehicle cooling fan having a plurality of blades which rotate about an axis to cause air to move through a radiator, the blades having outer ends which define a cylindrical envelope, the fan shroud having a generally cylindrical wall which surrounds the fan and which is positioned radially outwardly with respect to the cylindrical envelope, the aspirator having a housing defining an opening exposed to air moved by the fan and a port for connecting to a vehicle function, the aspirator housing having a longitudinal axis which forms an acute angle with respect to a plane which is tangent to the cylindrical wall of the shroud, characterized by:

• the aspirator housing forming a duct which extends from the opening to the port, the duct having a triangular cross sectional shape with an apex which projects in a direction which is upstream with respect to flow of air moved by the fan.