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The
Motion 85455/85456 Ball Drive Actuator incorporates all of the
features of the 85151/85152 unit except the large Motion Ball Drive
85139 is used to transmit thrust rather than the 85010. The 85139
with a diameter of 1.309 permits a load rating up to 1500 lbs.
which can be extended in certain applications. It also has integral
freewheeling at stroke ends to eliminate limit switches. The
85455 uses a translating tube for mounting, while the 85456 is
an open screw type unit where attachment is made directly to the
ball nut.
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The 85139 Ball Drive has an advancement
per revolution of .375 which generally results in higher stroke speeds for the
84555/85456 as compared to the 85151/85152. Because of the larger Ball Drive in
the 85455/84556 series some of the mounting dimensions vary from the
85151/85152. The 84555 minimum retracted centerline mounting dimension is 8.750
+ stroke where the 85151 unit is 4.625 + stroke. The translating tube uses a
.625 diameter mounting hole. Similarly the rod end option has a .625 diameter
hole and adds 2.375 to the minimum retracted centerline mounting dimension. With
the 85456 the minimum retracted centerline gearbox mounting hole to nut shoulder
is 6.875 as compared to 3.844 for the 85152.
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