Patent ID: 6497312
Filing Date: 2002-12-24
Classification: F16H

Abstract:
A hydrodynamic coupling device, comprising:a housing; a lock up clutch comprising a clutch element arranged in the housing, the clutch element being capable of being pressed against the housing; a friction surface mechanism arranged between the clutch element and the housing, wherein the clutch element and the friction surface mechanism separate an interior of the hydrodynamic coupling device into a first fluid space and a second fluid space; a fluid duct means in the friction surface mechanism, the fluid duct means being capable of permitting a working fluid to flow into and out of the first fluid space while preventing the working fluid from flowing out of the first fluid space into the second fluid space; a first connecting duct arrangement arranged to permit supply of the working fluid to the first fluid space; a second connecting duct arrangement capable of permitting flow of the working fluid into and out of the second fluid space; and a third connecting duct arrangement for discharging the working fluid from the first fluid space, at least when the clutch element is urged toward the housing and pressed up to the friction surface mechanism.