Reverse transfer system ball-screw, and electro-mechanical...

Details Reverse transfer system ball-screw, and electro-mechanical... Reverse transfer system ball-screw, and electro-mechanical...

2008-06-24

2008-06-24

Fenstermacher, David M (Department: 3682)

Machine element or mechanism

Gearing

Directly cooperating gears

C074S089320, C074S089340

Reexamination Certificate

active

07389709

ABSTRACT:
An electro-mechanical actuator (21) includes a reverse transfer system ball-screw (20). The actuator broadly includes a frame (22), a nut (43) mounted on the frame, at least one magnet (59) mounted on the nut, at least one coil (55) mounted on the frame, the coil being adapted to be selectively supplied with current to cause the nut to rotate within the frame, a rotary feedback device (80), and a screw (44) arranged within the nut for rotational and axial movement relative thereto. The screw and nut both have cooperative ball recesses (72, 74) that define a ball path in which a plurality of balls (73) are mounted. The ball recirculation path is provided in the screw. A rod (23) is connected to the screw for movement therewith. Relative rotation between the nut and screw will cause the screw and rod to move axially relative to the frame.

REFERENCES:
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patent: 6116106 (2000-09-01), Miyoshi
patent: 6857332 (2005-02-01), Pfister
patent: 2003/0167866 (2003-09-01), Durschmied
patent: 2006/0005645 (2006-01-01), Zhou

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