| 摘要 |
<p>#CMT# #/CMT# The actuator has brake units (106, 110) e.g. magnetic braking units, to brake sliding of an auxiliary rod (20) in a main rod (2) in an extension direction. The auxiliary rod comprises a thread (101) on an outer surface. The main rod has an end carrying a rotary bearing (102), which centers the auxiliary rod in the main rod and co-operates with the thread via a reversible helical connection such that extension of the auxiliary rod causes the bearing to rotate. The brake units brake the rotation of the bearing during extension of the auxiliary rod. #CMT#USE : #/CMT# Telescopic actuator. #CMT#ADVANTAGE : #/CMT# The arrangement of the thread on the auxiliary rod permits the utilization of a small pitch, thus reducing the braking torque for a same braking force of the auxiliary rod, and hence allowing the brake units to directly brake the rotation of the rotary bearing during extension of the auxiliary rod, without passing via a speed increasing unit. The actuator therefore improves the braking of the auxiliary rod. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic partial sectional semi-view of a telescopic actuator. 1 : Body 2 : Main rod 20 : Auxiliary rod 101 : Thread 102 : Rotary bearing 106, 110 : Brake units.</p> |
