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A transmission clutch cooling system includes a clutch housing defined between a drive hub of a drive member and a clutch hub of a driven member and a clutch assembly housed in the clutch housing. The clutch hub includes a hub deck having a plurality of bores therethrough, an inner annulus extending

A transmission clutch cooling system includes a clutch housing defined between a drive hub of a drive member and a clutch hub of a driven member and a clutch assembly housed in the clutch housing. The clutch hub includes a hub deck having a plurality of bores therethrough, an inner annulus extending axially from the hub deck, and an outer annulus extending axially from the hub deck, the outer annulus including a plurality of radial orifices therethrough and a lip flange extending from a distal end towards the inner annulus. The clutch assembly includes a plurality of clutch plates secured to the drive hub and a plurality of friction plates secured to the driven member. A piston assembly is provided for engaging or disengaging the plurality of friction plates against the plurality of clutch plates to cause or release integrated rotation of the drive member and the driven member.

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1. A transmission clutch cooling system comprising: a drive member including a drive hub situated about an axis of rotation;a driven member including a clutch hub concentrically situated about the axis of rotation, wherein the clutch hub includes a hub deck having a plurality of bores therethrough,

1. A transmission clutch cooling system comprising: a drive member including a drive hub situated about an axis of rotation;a driven member including a clutch hub concentrically situated about the axis of rotation, wherein the clutch hub includes a hub deck having a plurality of bores therethrough, an inner annulus extending axially from the hub deck, and an outer annulus extending axially from the hub deck, the outer annulus having a plurality of radial orifices therethrough and a lip flange extending from a distal end towards the inner annulus;a clutch housing defined between the drive hub and the clutch hub; anda clutch assembly housed in the clutch housing and including: a plurality of clutch plates secured to the drive hub to rotate with the drive member;a plurality of friction plates secured to the driven member to rotate with the clutch hub; anda piston assembly for engaging or disengaging the plurality of friction plates against the plurality of clutch plates to cause or release integrated rotation of the drive member and the driven member,wherein the plurality of bores are displaced radially inward of an inner diameter surface of the outer annulus to create a step, the step forming a radially outer edge of a respective bore of the plurality of bores that is offset from the inner diameter surface on a side of the lip flange. 2. The transmission clutch cooling system of claim 1, wherein the lip flange is formed to extend toward the inner annulus a distance greater than the radial dimension of the step. 3. The transmission clutch cooling system of claim 2, further comprising a coolant fluid continuously supplied to an interior space defined by the hub deck, the inner annulus, and the outer annulus of the clutch hub. 4. The transmission clutch cooling system of claim 3, wherein the plurality of radial orifices are sized to restrict flow of the coolant fluid to the clutch housing when the plurality of friction plates and the plurality of clutch plates are disengaged while permitting an increased flow of the coolant fluid to the clutch housing when the plurality of friction plates and the plurality of clutch plates are engaged. 5. The transmission clutch cooling system of claim 4, wherein the plurality of bores are arcuately spaced at equal angles around a perimeter of the hub deck such that at least a portion of one or more of the bores is always below a predetermined fluid level of coolant fluid pooled between the step and the lip flange during disengagement. 6. The transmission clutch cooling system of claim 4, further comprising a seal provided in a gap between the lip flange and a component of the driven member. 7. The transmission clutch cooling system of claim 1, further comprising: a coolant fluid continuously supplied to an interior space defined by the hub deck, the inner annulus, and the outer annulus of the clutch hub, anda slinger plate attached to the clutch hub and dividing the interior space into an upper space and a lower space, the slinger plate having a plurality of slinger bores. 8. The transmission clutch cooling system of claim 7, wherein the plurality of slinger bores extend radially to provide fluid communication from the upper space to the lower space. 9. The transmission clutch cooling system of claim 3, wherein the coolant fluid is automatic transmission fluid. 10. A clutch hub comprising: a hub deck having a plurality of bores therethrough;an inner annulus extending axially from the hub deck, andan outer annulus extending axially from the hub deck, the outer annulus including a plurality of orifices therethrough and a lip flange extending from a distal end towards the inner annulus,wherein the plurality of bores are displaced radially inward of an inner diameter surface of the outer annulus to create a step, the step forming a radially outer edge of a respective bore of the plurality of bores that is offset from the inner diameter surface on a side of the lip flange, andwherein at least one bore of the plurality of bores drains fluid flow away from the clutch assembly. 11. The clutch hub of claim 10, wherein the lip flange is formed to extend toward the inner annulus a distance greater than the radial dimension of the step. 12. The clutch hub of claim 10, wherein the plurality of orifices are sized to allow an increased flow of fluid therethrough when the clutch hub is rotating. 13. The clutch hub of claim 11, wherein the plurality of bores are arcuately spaced at equal angles around a perimeter of the hub deck such that at least a portion of one or more of the plurality of bores is always below a predetermined fluid level of a coolant fluid when contained by the step and the lip flange while the clutch hub is not rotating. 14. The clutch hub of claim 10, further comprising a slinger plate attached to the clutch hub, the slinger plate having a plurality of slinger bores extending radially. 15. A method of cooling a rotational clutch comprising: supplying a flow of coolant to an annular clutch hub having a plurality of axial bores and radial holes, the radial holes being in fluid communication with a clutch pack;increasing the flow of coolant to the clutch pack through the radial holes during engagement of the clutch pack; anddiverting a portion of the flow away from the clutch pack through the axial bores when the clutch pack is disengaged, the plurality of axial bores being displaced radially inward of an inner diameter surface of an outer annulus of the clutch hub to create a step. 16. The method of cooling a rotational clutch of claim 15, further comprising: collecting an amount of the coolant in a trough formed in a portion of the clutch hub, wherein the radial holes provide fluid communication from the trough to the clutch pack. 17. The method of cooling a rotational clutch of claim 16, further comprising: sizing the radial holes to restrict the flow from the trough to the clutch pack when the clutch pack is disengaged while permitting an increased flow of coolant to the clutch pack when the clutch pack is engaged. 18. The method of cooling a rotational clutch of claim 16, wherein the axial bores are arcuately spaced at equal angles around a perimeter of an axially facing portion of the clutch hub such that at least a portion of one or more of the axial bores is always below a fluid level of the coolant in the trough when the clutch pack is disengaged. 19. The method of cooling a rotational clutch of claim 15, wherein the coolant is automatic transmission fluid. 20. The method of cooling a rotational clutch of claim 15, further comprising: attaching a slinger plate to the clutch hub to divide an interior of the clutch hub into a first space and a second space, the axial bores providing fluid communication to the first space and the radial holes providing fluid communication between the second space and the clutch pack,wherein the slinger plate has a plurality of slinger bores extending radially.