Patent ID: 6461262
Filing Date: 2002-10-08
Classification: F16H,Y10T

Abstract:
A working oil filter device for a continuously variable transmission including a primary pulley mounting on a primary shaft and having a variable pulley groove width; a secondary pulley mounted on a secondary shaft having a variable pulley groove width such that a belt is made to run between said primary pulley and said secondary pulley; a forward clutch for transmitting the output of an engine in a forward direction to said primary shaft; and a reverse brake for transmitting the same in a reverse direction to said primary shaft, the filter device comprising:a secondary pressure adjust valve which adjusts and feeds the working oil to a secondary cylinder for varying the pulley groove width of said secondary pulley; a clutch pressure adjust valve disposed in a clutch pressure passage connecting the drain port of said secondary pressure adjust valve, said forward clutch and said reverse brake, which adjusts a clutch pressure with setting the drain pressure of said secondary pressure adjust valve to an original pressure; a lubrication pressure adjust valve disposed in a lubrication pressure passage connecting the drain port of said clutch pressure adjust valve and a lubricated portion, which adjusts a lubrication pressure with setting the drain pressure of said clutch pressure adjust valve to an original pressure; and a filter disposed on the upstream side of said clutch pressure passage.