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A coil assembly for a solenoid valve includes a bobbin formed from an electrically insulative material. A bore extends axially through the bobbin. A first flux ring having a sleeve extending axially from an annular base is mounted upon a first end of the bobbin with the sleeve extending into the bob

A coil assembly for a solenoid valve includes a bobbin formed from an electrically insulative material. A bore extends axially through the bobbin. A first flux ring having a sleeve extending axially from an annular base is mounted upon a first end of the bobbin with the sleeve extending into the bobbin bore. Similarly, a second flux ring also having a sleeve extending from an annular base is mounted upon a second end of the bobbin that is opposite from the first flux ring with its sleeve extending into the bobbin bore. The flux rings are formed from a magnetically permeable material that has a high heat conductivity. Magnet wire is wound upon the assembled bobbin and flux rings to form the coil assembly.

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1. A bobbin assembly for a solenoid valve comprising:a bobbin formed from an electrically insulative material and having pair of flanges formed upon the ends thereof, each of said flanges extending in a radial outward direction from said bobbin, said bobbin also having an axial bore formed therethro

1. A bobbin assembly for a solenoid valve comprising:a bobbin formed from an electrically insulative material and having pair of flanges formed upon the ends thereof, each of said flanges extending in a radial outward direction from said bobbin, said bobbin also having an axial bore formed therethrough, said bore being stepped with the inside diameter of one end of said bore being less than the inside diameter of the other end of said bore with the two inside diameters defining an axial shoulder within said bore; and a first flux ring formed from a magnetically permeable material having a high heat conductivity, said flux ring having an annular base portion and a tubular sleeve extending axially into an end of said bobbin bore; and a second flux ring formed from a magnetically permeable material having a high heat conductivity, said second flux ring extending axially into the other end of said bobbin bore and contacting said shoulder formed within said bobbin bore. 2. A bobbin assembly according to claim 1 further including a winding wound upon said bobbin between said flanges.3. A bobbin assembly according to claim 2 wherein said bobbin includes a third flange formed upon an end thereof, said third flange spaced axially apart from one of said pair of flanges, said third flange having an arcuate slot formed therein, said arcuate slot defining a spring having a free end, said free end being movable in an axial direction, and further wherein at least one coil lead support tower extends in an axial direction from said free end of said spring whereby said spring allows axial movement of said support tower to accommodate component stack up tolerances.4. A bobbin assembly according to claim 3 wherein said coil support tower has at least one axial slot formed therein, said axial slot receiving a coil lead wire.5. A bobbin assembly according to claim 2 wherein said first flux ring has an inside diameter and sleeve length selected to correspond to a particular solenoid valve.6. A bobbin assembly according to claim 5 wherein said second flux ring also has an inside diameter and sleeve length selected to correspond to said particular solenoid valve.7. A bobbin assembly according to claim 6 wherein at least one of said flux rings includes an annular recess formed in an inner surface whereby magnetic flux is concentrated in a portion of said bobbin bore.8. A bobbin assembly according to claim 2 wherein said second flux ring includes an annular base portion and a tubular sleeve that extends axially into said bobbin bore.9. A coil assembly for a solenoid valve comprising:a bobbin formed from an electrically insulative material, said bobbin having a stepped axial bore formed therethrough; a first flux ring formed from a magnetically permeable material having a high heat conductivity, said flux ring having an annular base portion and a tubular sleeve, said tubular sleeve extending axially into an end of said bobbin bore; a second flux ring formed from a magnetically permeable material having a high heat conductivity, said second flux ring having generally tubular shape, said second flux ring extending axially into an end of said bobbin bore and into contact with said bore step; a winding wound upon said bobbin to form a winding assembly; and a generally cup-shaped flux casing having an open end, said flux casing receiving said winding assembly and being secured to the circumference of said flux ring. 10. A coil assembly for a solenoid valve comprising:a bobbin formed from an electrically insulative material, said bobbin having an axial bore formed therethrough, said bore being stepped with the inside diameter of one end of said bore being less than the inside diameter of the other end of the bore with the two inside diameters defining an axial shoulder within said bore; a first flux ring formed from a magnetically permeable material having a high heat conductivity, said flux ring having an annular base portion and a tubular sleeve, said tubular sleeve extending axially into an end of said bobbin bore; a second flux ring formed from a magnetically permeable material having a high heat conductivity, said second flux ring having an annular base portion and a tubular sleeve extending axially into an end of said bobbin bore that is opposite from said first flux ring and contacting said bore step; a winding wound upon said bobbin to form a winding assembly; and a tubular flux casing, said winding assembly disposed within said flux casing with at least one of said flux rings secured to said flux casing. 11. A method for fabricating a solenoid coil comprising the steps of:(a) forming a bobbin from an electrically insulative material, the bobbin having an axial bore extending therethrough, the axial bore being stepped with the inside diameter of one end of the bore being less than the inside diameter of the other end of the bore with the two inside diameters defining an axial shoulder within said bore; (b) providing a flux ring formed from a magnetically permeable material that has a high heat conductivity, the flux ring having a generally tubular shape, and pressing the flux ring into an end of the bobbin bore with the end of the sleeve portion contacting the shoulder formed within the bore; (c) winding a coil upon the bobbin to form a coil assembly; (d) inserting the coil assembly into a flux casing; and (e) securing the flux casing to the coil assembly. 12. The method according to claim 11 wherein the bobbin includes pair of flanges formed upon the ends thereof, each of the flanges extending in a radial outward direction from the bobbin ends and further wherein in step (d) the coil is wound upon the bobbin between the flanges.13. The method according to claim 12 wherein the flux ring is a first flux ring and step (b) also includes providing a second flux ring formed from a magnetically permeable material that has a high heat conductivity, the second flux ring having a sleeve portion extending axially from an annular base portion, step (b) further including pressing the sleeve portion of the second flux ring into an end of the bobbin bore that is opposite from the first flux ring.14. A bobbin assembly for a solenoid valve comprising:a first portion formed from an electrically insulative material, said first portion having an annular base portion with a first cylindrical portion extending in an axial direction therefrom, said first cylindrical portion terminating in a first end portion; a second portion formed from a magnetically permeable material having a high heat conductivity, said second portion having an annular base portion with a second cylindrical portion extending in an axial direction therefrom, said second cylindrical portion terminating in a second end portion, said second end portion of said second cylindrical portion cooperating with said first end portion of said first cylindrical portion to form a bobbin; and a plurality of wire coils wound upon said bobbin. 15. A bobbin assembly according to claim 14 wherein one of said first and second end portions has a first annular notch formed in an inside surface thereof and said other of said first and second end portions has a second annular notch formed in outside surface thereof that is complementary to said first annular notch, said first and second annular notches extending over one another to form said bobbin.16. A bobbin assembly according to claim 15 wherein a press fit exists between said first and second notches.17. A bobbin assembly according to claim 14 wherein one of said first and second ends of said first and second cylindrical portions has an annular barb formed upon an inside surface thereof and said other of said first and second ends of said first and second cylindrical portions has an annular groove formed in outside surface thereof, said barb engaging said groove to secure one of said first and second bobbin portions to the other of said first and second bobbin portions to form said bobbin.