Fan shroud exit structure

Claim 2

A heat transfer system for an internal combustion engine comprising: a heat exchange means having a front and rear section; a shroud including a forward section arranged to enclose said rear section, and a rearwardly extending unitary contoured exit section including means defining a cylindrical throat, a radial expanding section and a radial flat portion; a fan assembly including a plurality of fan blades having leading and trailing edges wherein the following relationship within plus or minus 12 percent of AW exists: RF AW/3, CF AW/3, and R 2AW/3 where RF is the length of the radial flat portion, CF is the length of the cylindrical throat, R is the radius of the radial expanding section and AW is the projected axial width of the fan means wherein the improvement comprises: an interruption section means in said shroud exit means whereby the continuity is changed and the fan induced stream of air will have radial and axial components.

Claim 3

A cooling system for an internal combustion engine means comprising: a radiator means including a tube means, and a rearward area means; a shroud means having a forward section arranged to include said rearward area, and a rearwardly extending unitary contoured exit section means including a cylindrical throat means, a radial expanding section means and a radial flat portion means; a plurality of interruption section means cut into said rearwardly extending unitary contoured exit section; and a fan assembly means including a plurality of fan blade means having leading and trailing edge means, said leading edge means being adjacent said radiator means, wherein the following relationship plus or minus 12 percent exists: RF AW/3, CF AW/3, and R 2AW/3 where RF is the length of the radial flat portion, CR is the length of the cylindrical throat, R is the radius of the radial expanding section and AW is the projected axial width of the fan whereby the fan induced stream of air is converged and directed out generally radially adjacent said radial flat portion means and generally axially adjacent said interruption section means.

Claim 4

A cooling system for an internal combustion engine means comprising: a radiator means including a tube means, and a rearward area means; a shroud means having a forward section arranged to include said rearward area, and a rearwardly extending unitary contoured exit section means including a cylindrical throat means, a radial expanding section means and a radial flat portion means; a plurality of interruption section means cut into said rearwardly extending unitary contoured exit section; and a fan assembly means including a plurality of fan blade means having leading and trailing edge means, said leading edge means being adjacent said radiator means, wherein the following relationship plus or minus 12 percent exists: RF AW/3, CF AW/3, and R 2AW/3 where RF is the length of the radial flat portion, CR is the length of the cylindrical throat, R is the radius of the radial expanding section and AW is the projected axial width of the fan whereby the fan induced stream of air is converged and directed out generally radially adjacent said radial flat portion means and generally axially adjacent said interruption section means.

Claim 5

The cooling system of claim 2 wherein: said radiator means includes a rearwardly extending perforated area means; said shroud means entirely encloSes said perforated area means; and said trailing edge of said fan means forms a plane coextensive with said radial flat means wherein the following relationship exists: RF AW/3, CF AW/3, and R 2AW/3 where RF is the length of the radial flat portion, CF is the length of the cylindrical throat, R is the radius of the radial expanding section and AW is the projected axial width of the fan.

Claim 6

A vehicle having an operator station, an internal combustion engine, a radiator for cooling liquid from said engine, an axial flow fan axially facing said radiator and including a plurality of angular blades drawing air rearwardly through said radiator, and a shroud rearwardly extending from said radiator, a unitary shroud exit section means for closely surrounding said fan means and extending in the same directions as said shroud including a tubular means portion forming the leading edge thereof, an arcuated means portion extending generally rearwardly and outwardly and a flat flange portion means forming the trailing edge and lying in a plane perpendicular to said tubular means portion, wherein the following relationship plus or minus 12 percent exists: RF AW/3, CF AW/3 and R 2 AW/3 where RF is the length of the flat flange portion means, CF is the length of the tubular means portion, R is the radius of the arcuated means portion and AW is the projected axial width of the fan said fan means striking out a front and rear plane, said front plane intersecting said tubular means portion and said rear plane means intersecting said flat flange portion; and a plurality of interruption section means in said exit shroud means extending through said flat flange portion means and said arcuated means whereby the continuity and air flow characteristics of said exit shroud are changed such that radial and axial air streams are created.

Claim 7

A vehicle having an operator station, an internal combustion engine, a radiator for cooling liquid from said engine, an axial flow fan axially facing said radiator and including a plurality of angular blades drawing air rearwardly through said radiator, and a shroud rearwardly extending from said radiator, a unitary shroud exit section means for closely surrounding said fan means and extending in the same directions as said shroud including a tubular means portion forming the leading edge thereof, an arcuated means portion extending generally rearwardly and outwardly and a flat flange portion means forming the trailing edge and lying in a plane perpendicular to said tubular means portion, wherein the following relationship plus or minus 12 percent exists: RF AW/3, CF AW/3 and R 2 AW/3 where RF is the length of the flat flange portion means, CF is the length of the tubular means portion, R is the radius of the arcuated means portion and AW is the projected axial width of the fan said fan means striking out a front and rear plane, said front plane intersecting said tubular means portion and said rear plane means intersecting said flat flange portion; and a plurality of interruption section means in said exit shroud means extending through said flat flange portion means and said arcuated means whereby the continuity and air flow characteristics of said exit shroud are changed such that radial and axial air streams are created.

Claim 8

The shroud exit section of claim 4 wherein said tubular means portion is secured to said shroud around the entire circumference thereof forming a junction section; and said front plane struck out by said fan means intersects said junction section.

Claim 9

A vehicle having an operator station and an internal combustion engine, a radiator for cooling liquid from said engine, an axial flow fan axially facing said radiator and including a plurality of angular blades drawing air rearwardly through said radiator, and a shroud rearwardly extending from said radiator wherein the improvement comprises: a unitary fan shroud exit means secured to said shroud and extending rearwardly and outwardly including: a cylindrical throat means defining a leading edge, a radial expanding means and a radial flat means defining a trailing edge; said fan being enclosed therein, said blade means striking out a front plane coextensive with said cylindrical throat means wherein the following relationship exists: RF AW/3, CF AW/3, and R 2AW/3 where RF is the length of the radial flat portion, CF is the length of the cylindrical throat, R is the radius of the radial expanding section and AW is the projected axial width of the fan; and interruption means extending into said fan shroud exit means whereby the fan induced stream of air is divided into axially and radially flows.

Claim 10

A vehicle having an operator station and an internal combustion engine, a radiator for cooling liquid from said engine, an axial flow fan axially facing said radiator and including a plurality of angular blades drawing air rearwardly through said radiator, and a shroud rearwardly extending from said radiator wherein the improvement comprises: a unitary fan shroud exit means secured to said shroud and extending rearwardly and outwardly including: a cylindrical throat means defining a leading edge, a radial expanding means and a radial flat means defining a trailing edge; said fan being enclosed therein, said blade means striking out a front plane coextensive with said cylindrical throat means wherein the following relationship exists: RF AW/3, CF AW/3, and R 2AW/3 where RF is the length of the radial flat portion, CF is the length of the cylindrical throat, R is the radius of the radial expanding section and AW is the projected axial width of the fan; and interruption means extending into said fan shroud exit means whereby the fan induced stream of air is divided into axially and radially flows.

Claim 11

The improvement of claim 6 wherein: said fan shroud exit means is secured to said shroud around its entire circumference; and said interruption section means has a rear edge means, whereby a plane perpendicular to said edge means intersects said fan blade means between said front plane and said rear plane.