Hydraulic control device for automatic change-speed transmissions
AssigneeRegie Nationale des Usines Renault
InventorsAndre Lalin, Jean Piret
Life of this patent
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Abstract
Hydraulic control device for automatic change-speed transmissions, especially for motor vehicles, which comprises a fluid reservoir, a pump supplied from said reservoir, a main pressure regulation valve determining the line pressure of the device and supplied from said pump, a hydraulic circuit connected to said main pressure regulation valve and feeding a series of hydraulic receivers through an assembly of auxiliary regulation valves associated with time-lag means, respectively, one of said valves being supplied through a cut-off valve, said device further comprising at least one delivery conduit supplying fluid to a group of hydraulic elements mainly consisting of a flap valve and a gauged orifice connected in parallel.
Claims12
Hydraulic control device for automatic change-speed transmissions, especially for motor vehicles, which comprises a fluid reservoir, a pump supplied from said reservoir, a main pressure regulation valve determining the line pressure of the device and supplied from said pump, a hydraulic circuit connected to said main pressure regulation valve and feeding a series of hydraulic receivers through an assembly of auxiliary regulation valves associated with time-lag means, respectively, one of said valves being supplied through a cut-off valve, said device further comprising at least one delivery conduit supplying fluid to a group of hydraulic elements mainly consisting of a flap valve and a gauged orifice connected in parallel.
Hydraulic control device for automatic change-speed transmission, especially for motor vehicles, which comprises a fluid reservoir, a pump supplied from said reservoir, a main pressure regulation valve determining the line pressure in the device and supplied from said pump, a hydraulic circuit connected to said main pressure regulation valve and supplying fluid under pressure to a series of hydraulic receivers through the medium of a set of auxiliary regulation valves associated with time-lag means, respectively, one of said auxiliary regulation valves being supplied through a cut-off valve, the movable piston of said time-lag means comprising a movable chamber formed between a portion of reduced diameter of said piston and the piston bore, so that during one fraction of the piston stroke said chamber is connected to a pipe line connected in turn to a chamber formed between the sliding spool and the body of said auxiliary regulation valve.
Dependencies are inferred from the claim text.