HYDRAULIC CONTROL CIRCUIT OF VEHICLE POWER TRANSMISSION SYSTEM

摘要

PROBLEM TO BE SOLVED: To suppress mass increase and mountability degradation of a hydraulic control circuit in a vehicle power transmission system including a continuously variable transmission mechanism and a driving mechanism provided in parallel between an input rotating member and an output rotating member.SOLUTION: A hydraulic control circuit 80 comprises: a linear solenoid valve SLU; a synchromesh control valve 82; a lock-up clutch control valve 84; two selector valves (a first selector valve 86 and a second selector valve 88); and two solenoid valves (on-off solenoid valves SG and SL), whereby one linear solenoid valve SLU (in other words, the two small-sized solenoid valves without adding a large-sized linear solenoid valve for controlling a synchromesh mechanism S1) can control engagement and disengagement of each of a dog clutch D1 with the synchromesh mechanism S1 and a lock-up clutch Clu. Therefore, it is possible to suppress the mass increase and mountability degradation of the hydraulic control circuit 80 in a power transmission system 16.SELECTED DRAWING: Figure 3