| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the change in tractive force and to prevent derailment and unstableness by providing a pair of left and right swivel wheels on the front end portion and providing a pair of left and right fixed wheels on the rear end portion, respectively, at the lower side of a bogie and detecting the guide line with a sensor provided in a front drive unit to change the revolution speed of the left and right driving wheels of the front drive unit. SOLUTION: A pair of left and right swivel wheels 4 capable of rotating to the left and right are provided at a front end portion and a pair of left and right fixed wheels 5 are provided at a rear end portion, respectively, at a lower side of a bogie 2. Drive units 6, 7 on front and back are disposed along a centerline of the bogie 2. A rear drive unit 7 is disposed at a center point CP between fixed wheels 5. Further, a sensor 8 for detecting a guide line GL is disposed at a front end of the front drive unit 6, and a revolution speed of left and right drive wheels 9 of the front drive unit 6 is changed according to the output from the sensor 8. Because drive wheels 10 of the rear drive unit 7 rotate at a uniform speed even when the revolution speed of the drive wheels 9 changes, change in the tractive force of the front drive unit 6 is reduced. Also, the tractive force of the drive unit 7 is equal on the left and right sides.</p> |
