Patent ID: 6045480
Filing Date: 2000-04-04
Classification: F16H

Abstract:
A hydraulic pressure control device for use with an automatic transmission which provides a toroidal continuously variable transmission having power rollers held between input discs and output discs and transmitting power, a torque converter having a lock up clutch connected to the continuously variable transmission comprising:a pressure regulator valve for adjusting a line pressure of a working fluid supplied to said continuously variable transmission from a pump to a predetermined pressure;a pressure passage for introducing the adjusted line pressure to said lock up clutch through a lock up control valve;an oil cooler provided in a downstream portion of said lock up control valve; andthe working fluid being supplied to a lubricating circuit of said continuously variable transmission, wherein a lock up regulator valve for adjusting the pressure to that necessary for a lock up is provided in said pressure passage, a lubricating fluid passage is connected to a drain end of said lock up regulator valve, said lubricating fluid passage is connected to said pressure passage through an orifice, said lubricating circuit is separated into a first lubricating circuit for lubricating a bearing member of said power rollers and a second lubricating circuit for lubricating a rolling surface between said input and output discs and said power rollers, said first lubricating circuit is connected to a downstream portion of said cooler and said second lubricating circuit is connected to said lubricating fluid passage.