| 摘要 |
A coupling device ( 11 ) of the type including a clutch assembly ( 29 ) actuation of which is responsive to fluid pressure in a clutch piston apply chamber ( 43 ), and a series of fluid passages ( 53,55,57,59 ) communicating the chamber to a control valve assembly ( 69 ). A housing ( 15 ) defines a hub portion ( 61 ) surrounded by a plenum member ( 17 ) carrying two high pressure seals ( 63;163 ). The housing is formed such that the outer surface ( 60 ) of the hub portion is free of graphite porosity, to improve the life of the seals. Preferably, each of the seals ( 63;163 ) has a height/width ratio selected to provide the desired radially inward sealing force, but wherein the seals are still able to be assembled within the respective seal cavities ( 73,75;173,175 ).
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