Back to results
US 7,350,355 B2Granted
Hydraulic system having at least one hydraulic valve for controlling a transmission
AssigneeLuK Lamellen und Kupplungsbau Beteiligungs KG
InventorEric Müller
Life of this patent
Estimating the term…
Abstract
A hydraulic system having at least one hydraulic valve for controlling a transmission, in particular a continuously variable transmission. The hydraulic valve is controlled by a pilot circuit including at least one control element having a variable flow resistance and one control element having a constant flow resistance. The control element having a variable flow resistance is connected upstream of the control element having a constant flow resistance.
Claims4
A hydraulic system having at least one hydraulic valve for controlling a transmission, said hydraulic system comprising:
- a hydraulic valve that is actuated through a pilot circuit including at least one control element having a variable flow resistance and one control element having a constant flow resistance, wherein the at least one control element having a variable flow resistance is an electrically-controlled proportional valve having a rising characteristic curve and is connected upstream of the control element having a constant flow resistance, wherein the control element having a constant flow resistance is connected to a leakage tank, and wherein the hydraulic valve is connected by a control pressure line with a pilot pressure circuit at a point between the at least one control element having a variable flow resistance and the control element having a constant flow resistance.
Dependencies are inferred from the claim text.