| 摘要 |
PROBLEM TO BE SOLVED: To provide a working vehicle having a transmission using a hydraulic continuously variable transmission, for nonslip control without detecting an actual vehicle speed. SOLUTION: In the working vehicle adapted to transmit power from a driving source 40 to drive wheels 53 and 53 through the hydraulic continuously variable transmission (HST) 50, a pressure detection means 75 and a solenoid pressure control valve 84 are disposed in a closed circuit oil passage connecting mutually a hydraulic motor 51 and a hydraulic pump 52 of the hydraulic continuously variable transmission 50, the pressure detection means 74, the solenoid pressure control valve 84, and rotating speed detection means 83 and 83 of the drive wheel 53 and 53 are connected with a control means 80. An ideal rotating speed of the drive wheels 53 and 53 is calculated from a detection value of the pressure detection means 74, and a difference between the ideal rotating speed and an actual rotating speed of the drive wheels detected by the rotating speed detection means is calculated. When the actual rotating speed is larger than the ideal rotating speed, the solenoid pressure control valve 84 controls to lower the closed circuit oil pressure. COPYRIGHT: (C)2008,JPO&INPIT |
