A balanced clutch system is provided for use in a transmission. The balanced clutch system includes a clutch assembly that has a clutch piston and a balance piston that cooperate with a clutch piston cavity and a balance piston cavity. Each of the clutch piston cavity and balance piston cavity recei
A balanced clutch system is provided for use in a transmission. The balanced clutch system includes a clutch assembly that has a clutch piston and a balance piston that cooperate with a clutch piston cavity and a balance piston cavity. Each of the clutch piston cavity and balance piston cavity receives a continuous supply of fluid and establishes a centrifugal head pressure therein, during use. The centrifugal head pressure established in the balance piston cavity contributes to a force that opposes a self-engaging tendency of the clutch assembly that is created by the centrifugal head pressure established within the clutch piston cavity.
대표청구항▼
1. A balanced clutch system, comprising: a shaft being rotatable and having a lubricating fluid passage and a clutch fluid supply passage;a clutch assembly provided concentrically around the shaft and including a clutch input accepting power into the clutch assembly, a clutch output conveying power
1. A balanced clutch system, comprising: a shaft being rotatable and having a lubricating fluid passage and a clutch fluid supply passage;a clutch assembly provided concentrically around the shaft and including a clutch input accepting power into the clutch assembly, a clutch output conveying power out of the clutch assembly, and a clutch piston that is movable for (i) engaging the clutch assembly so as to translate rotation of the clutch input to rotation of the clutch output, (ii) disengaging the clutch assembly so as to isolate the clutch input from the clutch output, the clutch assembly further including: a clutch piston cavity provided within the clutch assembly and accepting fluid from the clutch fluid supply passage of the shaft;a balance piston cavity provided within the clutch assembly and accepting fluid from the lubricating fluid passage of the shaft;a balance piston spaced from the clutch piston, the balance and clutch pistons being on opposing sides of the balance piston cavity; anda pin that abuts the clutch piston and extends through the balance piston, the pin moving in unison with the clutch piston and applying an engaging force to a clutch pack of the clutch assembly when the clutch piston is biased toward the clutch pack,wherein during use of the balanced clutch system, fluid in the clutch piston cavity and balance piston cavity establish respective centrifugal head pressures that contribute to forces applied to opposing sides of the clutch piston such that when the clutch assembly is disengaged, the clutch piston remains in a substantially constant position during a variation in respective centrifugal head pressures. 2. The balanced clutch system of claim 1, wherein the respective centrifugal head pressures in the clutch piston cavity and balance piston cavity vary at the same rate of change with respect to each other. 3. The balanced clutch system of claim 1, wherein an outermost portion of the clutch piston cavity and an outermost portion of the balance piston cavity are substantially equally spaced from the shaft in a radial direction. 4. The balanced clutch system of claim 1, wherein the balance piston is provided between the balance piston cavity and a clutch pack of the clutch assembly. 5. The balanced clutch system of claim 4, further comprising a seal extending between the balance piston and the shaft. 6. The balanced clutch system of claim 4, wherein the balance piston is fixed with respect to movement along a longitudinal axis of the shaft. 7. The balanced clutch system of claim 1, wherein an outermost portion of the clutch piston cavity is located radially closer to the shaft than is an outermost portion of the balance piston cavity. 8. The balanced clutch system of claim 7, wherein the balance piston has a surface area that is larger than a surface area of the clutch piston. 9. The balanced clutch system of claim 8, wherein (i) the balance piston surface area is defined at an interface between the balance piston and the balance piston cavity, and (ii) the clutch piston surface area is defined at an interface between the clutch piston and the clutch piston cavity. 10. The balanced clutch system of claim 9, wherein the clutch piston and balance piston have dissimilar cross-sectional profiles. 11. The balanced clutch system of claim 10, wherein a portion of the balance piston is housed inside of the clutch piston. 12. The balanced clutch system of claim 11, wherein a smaller surface area of a first side of the clutch piston interfaces the clutch piston cavity and a larger surface area of a second side of the clutch piston interfaces the balance piston cavity. 13. A balanced clutch system, comprising: a clutch assembly provided concentrically around a shaft and including, a clutch pack that is either engaged to translate rotation of a clutch input to rotation of a clutch output; or disengaged to isolate the clutch input from the clutch output;a clutch piston that is movable toward the clutch pack to engage the clutch pack and being movable away from the clutch pack to disengage the clutch pack;a clutch piston cavity adjacent a first side of the clutch piston and defining a variable volume thereof, the clutch piston cavity formed in part by the first side of the clutch piston and a portion of a gear extending concentrically away from the shaft;a balance piston cavity adjacent a second side of the clutch piston and defining a variable volume thereof, the volume of the balance piston cavity varying inversely with respect to the volume of the clutch piston cavity, such that the volume of the clutch piston cavity increases when the volume of the balance piston cavity decreases, and the volume of the clutch piston cavity decreases when the volume of the balance piston cavity increases; andwherein the volumes of the clutch piston cavity and balance piston cavity remain substantially constant when the clutch pack is disengaged and while the centrifugal head pressures of the clutch piston cavity and the balance piston cavity vary. 14. A balanced clutch system, comprising: a shaft being rotatable and conveying a fluid therethrough;a balanced clutch assembly provided concentrically around the shaft and accepting the fluid that is conveyed through the shaft, the balanced clutch assembly including: a clutch basket provided toward an outer portion of the balanced clutch assembly;a clutch hub provided toward an inner portion of the balanced clutch assembly;a clutch pack provided between and selectively coupling the clutch basket and the clutch hub, such that (i) when the clutch pack is disengaged, the clutch basket and clutch hub are isolated from each other, and (ii) when the clutch pack is engaged, the clutch pack translates rotation between the clutch basket and clutch hub; anda clutch piston being fluidly actuated with respect to the clutch pack so as to move the least one clutch disc between the disengaged position and the engaged position;a clutch piston cavity adjacent a first side of the clutch piston and holding a volume of fluid, the clutch piston cavity formed in part by the first side of the clutch piston and a portion of a gear extending concentrically away from the shaft, wherein during rotation of the shaft, the fluid within the clutch piston cavity establishes a centrifugal head pressure that biases the clutch piston against the clutch pack;a balance piston provided between the clutch piston and the clutch pack;a balance piston cavity defined between the clutch piston and balance piston and holding a volume of fluid therein, wherein during rotation of the shaft, the fluid within the balance piston cavity establishes a centrifugal head pressure that biases the clutch piston away from the clutch pack; andwherein the force provided by the centrifugal head pressure of the balance piston cavity substantially balances the force provided by the centrifugal head pressure of the clutch piston cavity so as to minimize self engagements of the clutch assembly. 15. A balanced clutch system, comprising: a first balanced clutch assembly provided on a first rotatable shaft and having a clutch piston provided between a clutch piston cavity and a balance piston cavity, the clutch piston cavity and the balance piston cavity of the first balanced clutch assembly being subjected to centrifugal forces during use, such that fluid held within the clutch piston cavity and the balance piston cavity establish respective centrifugal head pressure on opposing sides of the clutch piston of the first balanced clutch assembly; anda second balanced clutch assembly provided on a second rotatable shaft and having a clutch piston provided between a clutch piston cavity and a balance piston cavity of the second balanced clutch assembly, the clutch piston cavity and the balance piston cavity being subjected to centrifugal forces during use, such that fluid held within the clutch piston cavity and the balance piston cavity establish respective centrifugal head pressure on opposing sides of the clutch piston of the second balanced clutch assembly; andwherein (i) the clutch piston cavity and the balance piston cavity of the first balanced clutch assembly define at least one of substantially analogous volumes and substantially analogous radial distances from a longitudinal axis of the first rotatable shaft to a radially outer most portion of each of the clutch piston cavity and the balance piston cavity of the first balance clutch assembly; and (ii) the clutch piston cavity and the balance piston cavity of the second balanced clutch assembly define different volumes and having different radial distances from a longitudinal axis of the second rotatable shaft to a radially outermost portion of each of the clutch piston cavity and the balance piston cavity of the second balance clutch assembly.
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