Hydraulic control system for continuously variable transmission

Details Hydraulic control system for continuously variable transmission Hydraulic control system for continuously variable transmission

F - Mech Eng,Light,Heat,Weapons

15

B

138/56

F15B 9/09 (2006.01) F16H 61/662 (2006.01)

Patent

CA 1252021

HYDRAULIC CONTROL SYSTEM FOR CONTINUOUSLY VARIABLE TRANSMISSION ABSTRACT: A control arrangement for a continuously variable transmission (25) includes an electronic control system (50) and a hydraulic control system (51). In the hydraulic control system three separate electromechani- cal control assemblies (80,81,82) are used to regulate the pressure in the secondary sheave chamber (to hold the belt tension), the fluid flow to and from the primary sheave chamber (to regulate the CVT ratio), and to control the pressure in the apply line for the clutch chamber. The pump assembly (72) of the hydraulic control system has a first output connection (73) for providing fluid at line (high) pressure in the main line, and a second (75), low pressure output connection for providing fluid at a low pressure to satisfy the clutch cooling requirements. The high pressure and low pressure systems are essentially independent of each other.

503829

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