| 摘要 |
A self-propelled center pivot irrigation system has individual span units each one of which has at least one or more fluid conduits, and at least one or more power frames for propelling the span unit, each power frame has at least one or more drive wheels, a drive motor, and transmission means connecting the drive motor to the drive wheels to transmit power from the drive motor to the drive wheels, the transmission means has an input drive gear, intermediate planetary gear speed reduction means and an output shaft for connection between the drive motor output shaft and the power frame drive wheels to provide a low friction, speed reducing, torque increasing drive for the power frame drive wheels from the drive motor.
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