CHAIN LINK CLAMPING FORCE CONTROL DEVICE FOR CONTINUOUSLY-VARIABLE TRANSMISSION MECHANISM

摘要

PROBLEM TO BE SOLVED: To solve a problem concerning to waste of clamping force generating energy such as pump driving energy at a gear ratio in which a chain is engaged with movable teeth capable of moving back and forth on the periphery of a pulley center boss section.SOLUTION: Secondary pulley pressure (chain holding pressure) Ps is reduced at &Dgr;PsL only corresponding to the chargeable initial torque value of the movable teeth at an initial time of manufacture from a hydraulic pressure value (slip preventive value with chain holding pressure only) PsL at a normally fixed A1 point. If a slip rate deviation &Dgr;S=|S-So| between a slip rate S of the chain at a reduced state and an initial slip rate So (=0) of the chain at the initial time of manufacture is an allowable upper limit value &Dgr;Smax or below as being shown at an A2 point, a secondary pulley pressure correction amount (chain link holding pressure correction amount) &Dgr;PsH for making the slip rate deviation &Dgr;S set at zero as being shown at an A3 point is calculated, and Ps= PsH=PsL-&Dgr;Ps obtained by making the secondary pulley pressure Ps reduce and correct &Dgr;PsH only from the hydraulic pressure value PsL at the A1 point is used for chain holding pressure control of the secondary pulley at the highest gear ratio.