| 摘要 |
A working machine having a belt-type continuously variable transmission in a working power transmission system includes a target working speed setting section for optionally setting a target working rotational speed of a working unit, a working unit speed sensor that detects an actual working rotational speed of the working unit, a speed reduction ratio regulation mechanism that regulates a minimum speed reduction ratio of a rotational speed of a driven pulley with respect to a drive pulley, and a control unit. The control unit controls a drive source rotational speed to bring the actual working rotational speed close to the target working rotational speed, obtains a minimum limit speed reduction ratio based upon a target minimum rotational speed of a drive source and the target working rotational speed, and controls the speed reduction ratio regulation mechanism to keep the minimum limit speed reduction ratio. |
| 主权项 |
1. A working machine in which a belt-type continuously variable transmission is interposed in a working power transmission system from a drive source to a working unit, and a driven pulley of the belt-type continuously variable transmission includes a fixed sheave, a movable sheave displaceable in an axial direction with respect to the fixed sheave, an urging member that urges the movable sheave toward the fixed sheave, and a torque cam mechanism that converts a part of a rotational force that acts on the movable sheave into a thrust that presses a side surface of a belt, comprising:
a target working speed setting section that optionally sets a target working rotational speed of the working unit; a working unit speed sensor that detects an actual working rotational speed of the working unit; a speed reduction ratio regulation mechanism that regulates a minimum speed reduction ratio of a rotational speed of the driven pulley to a drive pulley; and a control unit that controls the drive source and the speed reduction ratio regulation mechanism, wherein the control unit is configured to control a rotational speed of the drive source so as to bring the actual working rotational speed detected by the working unit speed sensor close to the target working rotational speed, obtain a minimum limit speed reduction ratio on the basis of a target minimum rotational speed of the drive source, which is set in advance or optionally set by a drive minimum speed setting section, and the target working rotational speed of the working unit, and control the speed reduction ratio regulation mechanism to keep the obtained minimum limit speed reduction ratio. |
