| 摘要 |
<p>Hydraulic recoil mechanisms are useful, for example, in maintaining desired tension in the drive belts of vehicles. The hydraulic components of such mechanisms are prone to leakage over an extended period of frictionally driven belted non-usage and thereby allow the tension in the belts to gradually decrease. The subject belt tension control system (62) includes a friction locking device (52) to automatically lock the piston rod (41) relative to the cylinder (36) to maintain a predetermined level of tension in the belt (18) when the pump (63) which furnishes pressurized hydraulic fluid to the system stops operating. Thus, the frictional couple between the belt (18) and the drive wheel (16) is maintained during periods of non-use and the parking brake is effective to hold the vehicle at a stationary position.</p> |
