A clutch apparatus includes a clutch pack including a plurality of friction disks having friction surfaces. The clutch pack may include a plurality of cooling inlets. The clutch pack may selectively transfer torque from a torque supplying member to a torque receiving member. The clutch apparatus may
A clutch apparatus includes a clutch pack including a plurality of friction disks having friction surfaces. The clutch pack may include a plurality of cooling inlets. The clutch pack may selectively transfer torque from a torque supplying member to a torque receiving member. The clutch apparatus may include a rotating manifold having at least a first cooling port for directing a cooling fluid to the clutch pack and at least a portion of the rotating manifold may be coupled for rotation with at least a portion of the friction disks. A fluid-flow area of at least a subset of the plurality of cooling inlets may be dissimilar from other of the plurality of cooling inlets for enabling a desired fluid flow to the friction disks.
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1. A clutch apparatus comprising: a clutch pack for selectively transferring torque including a plurality of friction disks having friction surfaces;a rotating manifold including a plurality of cooling inlets for directing a cooling fluid to the clutch pack, wherein at least a portion of the rotatin
1. A clutch apparatus comprising: a clutch pack for selectively transferring torque including a plurality of friction disks having friction surfaces;a rotating manifold including a plurality of cooling inlets for directing a cooling fluid to the clutch pack, wherein at least a portion of the rotating manifold is coupled for rotation with at least a portion of the friction disks;wherein a fluid-flow area of at least a subset of the plurality of cooling inlets is dissimilar from other of the plurality of cooling inlets for facilitating a desired relative fluid flow to the friction disks;wherein the fluid-flow area of at least the subset of the plurality of cooling inlets is selectively adjusted based at least partially on a determined temperature difference of the friction disk friction surfaces of a corresponding subset of the plurality of friction disks relative to the friction disk friction surfaces of other of the plurality of friction disks;a coolant passage positioned radially inward of the clutch pack for communicating the cooling fluid to the plurality of cooling inlets;a piston chamber positioned radially inward of the clutch pack and fluidly separated from the coolant passage, wherein the piston chamber is operably connected to the clutch pack for exerting a compressive force on at least a portion of the clutch pack as a fluid is pressurized into the piston chamber;a piston;a balance chamber in fluid communication with the coolant passage, the balance chamber disposed radially inward of the clutch pack and at least partially between the coolant passage and the piston, wherein the balance chamber and the coolant passage receive fluid through at least one port of the rotating manifold, and wherein movement of the piston as the fluid flows into the piston chamber displaces at least a portion of the cooling fluid from the balance chamber and into the coolant passage; andwherein a portion of the piston and a portion of the rotating manifold form a pressure boundary for the piston chamber, and wherein the piston chamber selectively receives fluid through the rotating manifold to axially displace the piston relative to the rotating manifold. 2. The apparatus of claim 1, wherein the fluid-flow area of at least the subset of the plurality of cooling inlets is greater than the other of the plurality of cooling inlets when the friction disk friction surfaces of the corresponding subset of the plurality of friction disks have a determined operating temperature that is at least estimated to be greater than the friction disk friction surfaces of the other of the plurality of friction disks. 3. The apparatus of claim 1, wherein the plurality of cooling inlets are defined by a predefined flow cross-section for each cooling inlet configured to provide the desired fluid-flow to the friction disks. 4. The apparatus of claim 3, wherein the predefined flow cross-section determines the fluid-flow area for the corresponding cooling inlets such that enlarging the flow cross-section increases the fluid-flow area. 5. The apparatus of claim 3, wherein the predefined flow cross-section of at least the subset of the plurality of cooling inlets is greater than other of the plurality of cooling inlets when the friction disk friction surfaces of the corresponding subset of the plurality of friction disks have a determined operating temperature that is at least estimated to be greater than the friction disk friction surfaces of other of the plurality of friction disks. 6. The apparatus of claim 1, wherein the fluid-flow area of at least the subset of the plurality of cooling inlets is permanently adjusted to differ in dimension from the other plurality of cooling inlets. 7. The apparatus of claim 6, wherein the fluid-flow area of at least the subset of the plurality of cooling inlets is at least one of sized and positioned to provide a different relative fluid flow from other of the plurality of cooling inlets based on the determined temperature difference of the friction disk friction surfaces of the corresponding subset of the plurality of friction disks in relation to the friction disk friction surfaces of other of the plurality of friction disks. 8. The apparatus of claim 7, wherein the fluid-flow area of at least the subset of the plurality of cooling inlets is greater than other of the plurality of inlets, and wherein the subset of the plurality of cooling inlets is positioned axially outwards from other of the plurality of cooling inlets having a smaller fluid-flow area. 9. The apparatus of claim 1, wherein the rotating manifold further includes a central web portion, and wherein the coolant passage and the balance chamber are defined axially between the central web and the piston. 10. A clutch apparatus, comprising: a clutch pack for selectively transferring torque to a torque receiving member, the clutch pack including a plurality of friction disks having friction surfaces;a rotating manifold including a plurality of cooling inlets for directing a cooling fluid to the clutch pack, wherein at least a portion of the rotating manifold is coupled for rotation with at least a portion of the friction disks;a piston chamber positioned radially inward of the clutch pack, wherein the piston chamber is operably connected to the clutch pack for exerting a compressive force on at least a portion of the clutch pack as a first fluid is pressurized into the piston chamber;a piston;a balance chamber disposed at least partially between the piston and the rotating manifold, wherein movement of the piston as the first fluid flows into the piston chamber will displace an amount of a second fluid from the balance chamber, wherein a portion of the piston and a portion of the rotating manifold form a pressure boundary for the piston chamber, and wherein the piston chamber selectively receives the first fluid through the rotating manifold to axially displace the piston relative to the rotating manifold; anda spring configured to assert a biasing force on the piston when the piston is axially displaced, the spring arranged outside the piston chamber and the balance chamber;wherein a fluid-flow area of at least a subset of the plurality of cooling inlets is dissimilar from the other of the plurality of cooling inlets for facilitating a desired relative fluid flow to the plurality of friction disks during operation; andwherein the fluid-flow area of at least the subset of the plurality of cooling inlets is at least one of sized and positioned to provide a different volumetric flow of fluid from the other of the plurality of cooling inlets based at least partially on a determined temperature variation that is at least one of measured and estimated between the friction surfaces of a corresponding subset of the plurality friction discs and the friction surfaces of the other of the plurality of friction disks. 11. The clutch apparatus of claim 10, wherein the axial displacement of the piston in a forward direction axially deflects the spring such that the spring biases the piston in a direction opposite the forward direction. 12. The apparatus of claim 10, wherein the fluid-flow area of the plurality of cooling inlets is defined by a flow cross-section for each cooling inlet configured to provide the desired relative fluid-flow to the friction disks. 13. The apparatus of claim 12, wherein the flow cross-section of each cooling inlet of the subset of the plurality of cooling inlets is greater than the flow cross-section of each cooling inlet of the other of the plurality of cooling inlets to provide a greater volumetric flow of fluid to the corresponding subset of the plurality of friction disks than the other of the plurality of friction disks. 14. The apparatus of claim 10, wherein the fluid-flow area of at least one of the plurality of cooling inlets is permanently adjusted to differ in dimension from the other plurality of cooling inlets. 15. A clutch apparatus comprising: a clutch pack for selectively transferring torque including a plurality of friction disks having friction surfaces;a rotating manifold including a plurality of cooling inlets for directing a cooling fluid to the clutch pack, wherein at least a portion of the rotating manifold is coupled for rotation with at least a portion of the friction disks;wherein a fluid-flow area of at least a subset of the plurality of cooling inlets is dissimilar from other of the plurality of cooling inlets for facilitating a desired relative fluid flow to the friction disks;wherein the fluid-flow area of at least the subset of the plurality of cooling inlets corresponds at least to an operating temperature of the friction disk friction surfaces of a corresponding subset of the plurality of friction disks such that greater operating temperatures correspond to larger fluid-flow areas and increased fluid flow to the corresponding subset of the plurality of friction disks;a coolant passage positioned radially inward of the clutch pack for communicating the cooling fluid to the plurality of cooling inlets;a piston chamber positioned radially inward of the clutch pack and fluidly separated from the coolant passage, wherein the piston chamber is operably connected to the clutch pack for exerting a compressive force on at least a portion of the clutch pack as a fluid is pressurized into the piston chamber;a piston;a balance chamber in fluid communication with the coolant passage, the balance chamber disposed radially inward of the clutch pack and at least partially between the coolant passage and the piston, wherein the balance chamber and the coolant passage receive fluid through at least one port of the rotating manifold, and wherein movement of the piston as the fluid flows into the piston chamber displaces at least a portion of the cooling fluid from the balance chamber and into the coolant passage;wherein a portion of the piston and a portion of the rotating manifold form a pressure boundary for the piston chamber, and wherein the piston chamber selectively receives fluid through the rotating manifold to axially displace the piston relative to the rotating manifold;wherein a spring is disposed between a first retaining ring disposed on the piston and a second retaining ring disposed on the rotating manifold. 16. The clutch apparatus of claim 15, wherein the spring is configured to assert a biasing force on the piston when the piston is axially displaced, and wherein the spring is arranged outside the piston chamber, the coolant passage, and the balance chamber. 17. The clutch apparatus of claim 16, wherein the axial displacement of the piston in a forward direction axially deflects the spring such that the spring biases the piston in a direction opposite the forward direction. 18. The clutch apparatus of claim 15, wherein the axial displacement of the piston in a forward direction axially deflects the spring via interference between the first retaining ring and second retaining ring, such that the spring biases the piston in a direction opposite the forward direction.
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