Hydraulic lubrication control system for an automatic transmission
AssigneeFord Global Technologies, LLC
InventorTimothy A. Droste
Life of this patent
Estimating the term…
Abstract
A sharp-edged orifice, located in an hydraulic circuit between a lubrication system and a source of lubrication, is connected to a flow control valve, which balances the differential pressure across the orifice and throttles the source of fluid pressure to a lubrication feed line. A lube augmentation valve, responsive to pressure, present when operating in forward drive, alternately opens and closes lubrication fluid flow through a second sharp-edged orifice located in a line arranged in parallel with the first orifice and connected downstream from that orifice and upstream from the lubrication circuit.
Claims10
A system for supplying hydraulic fluid to a lubrication circuit of a multiple-speed ratio transmission, comprising:
- a source of fluid at regulated pressure;
- a first orifice located between the fluid source and lubrication system, producing a pressure difference thereacross due to flow through the orifice;
- flow control valve means having an outlet port, for alternately opening and closing a connection between the fluid source and a first side of the first orifice in response to the magnitude of said pressure difference;
- valve means responsive to the current speed ratio of the transmission for alternately opening and closing a connection between said outlet port and a second side of the first orifice between the first orifice and lubrication circuit.
A system for supplying hydraulic fluid to a lubrication circuit of a multiple-speed ratio transmission, comprising:
- a first source of fluid at regulated pressure;
- a second source of fluid;
- a first orifice located between the fluid source and lubrication system, producing a pressure difference thereacross due to flow through the orifice;
- flow control valve means having an outlet port, for alternately opening and closing a connection between the fluid source and a first side of the first orifice in response to the magnitude of said pressure difference;
- a laminar orifice located between the second source of fluid and the second side between the first orifice and lubrication circuit, the rate of fluid flow therethrough increasing with an increase in temperature of the fluid and decreasing with a decrease in temperature of the fluid;
- and
- valve means responsive to the current speed ratio of the transmission for alternately opening and closing a connection between said outlet port and a second side of the first orifice between the first orifice and lubrication circuit.
Dependencies are inferred from the claim text.