Bevel Gear Ball Screw Jacks
Ball Screw Jacks - 12.3 kN to 76 kN
ActionJac™ Inch or Metric Ball Screw Jacks use a ball screw and nut made from hardened alloy steel with hardened bearing balls carrying the load between nut and screw. This rolling action reduces friction between the nut and the screw permitting smooth and efficient movement of the load. Because of the greater efficiency and rolling action, the ball screw can operate at higher speeds or increased duty cycle when compared with the Machine Screw Jack.
The addition of a high efficiency ball screw and nut reduces the required input torque to approximately one-third the torque required for the Machine Screw Jack. Bevel Gear designs are available with optional accessories such as boots, top plates, and clevis mounts.
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A lift shaft moves through the gear box. An integrated nut and Bevel Gear rotate together. When the lift shaft is held to prevent rotation, it moves linearly through the gear box to move the load.
The lift shaft must be attached to something to prevent rotation or the shaft (and load) will turn and not translate. A "keyed" feature can be added on translating models to prevent this rotation.
Anti-rotation is accomplished by a square guide attached to the screw translating inside a square stem cover. The square stem tube is supplied with lube fittings.
A lift shaft moves a nut as it turns and is fixed to the bevel gear. This causes the load, which is attached to the travel nut, to move along the lift shaft.