Patent ID: 6896636

Claim:
An oil supply device for a consumer device in an automatic transmission wherein the consumer device operates in a steady state mode requiring a low volume supply of fluid at a high pressure and in a gear shifting mode presenting an additional unpressurized gear shift volume requiring a higher volume supply of fluid at a lower pressure, the oil supply device comprising: a high pressure feed line; a low pressure feed line; a restricted inlet aperture located between the high pressure feed line and an input of the consumer device to provide a restriction in a fluid flow from the high pressure feed line to provide a low volume flow of fluid at the high pressure to the consumer device; and a one way valve located between the low pressure feed line and the input of the consumer device to provide, in conjunction, a higher volume flow of fluid at the lower pressure to the consumer device; wherein, when the consumer device presents the additional unpressurized gear shift volume to the oil supply device upon entering the gear shifting mode, the restriction in the fluid flow from the high pressure feed line, provided by the restricted inlet aperture, results in a decrease in a fluid pressure at the input to the consumer device; and the decrease in fluid pressure at the input to the consumer device induces a flow of the higher volume of fluid at a lower pressure from the low pressure feed line to the consumer device.