| 摘要 |
<p>A spring seat is mounted on each end of a pivot shaft which is mounted transversely of the truck frame between the drive wheels and tag wheels and is pivoted by a rocker arm pivotally connected to the piston rod of a hydraulic cylinder. A roller for engaging the rear end of the corresponding drive wheel leaf spring is mounted at the front upper corner of the spring seat, while a pivot pin for the front end of the corresponding tag wheel leaf spring is mounted at the lower rear corner of the spring seat. The rear end of each tag wheel leaf spring extends into a rear seat attached to the frame, engaging a roller in the rear seat. Lift of the tag wheels is produced when the spring seat is pivoted hydraulically, while the spring seats permit equalization of the load between the drive wheels and the tag wheels. The hydraulic cylinder may be single acting or double acting, but if the latter, a lost motion link is pivoted between the piston rod and the rocker arm.</p> |
