Electromechanical strut

Details Electromechanical strut Electromechanical strut

2007-06-26

2007-06-26

Pedder, Dennis H. (Department: 3612)

Land vehicles: bodies and tops

Bodies

Door or window with specified vehicle feature

C296S056000

Reexamination Certificate

active

11199470

ABSTRACT:
An electromechanical strut using an inline motor coupled to an inline planetary gear that are both mounted in the lower housing. The motor-gear assembly drives a worm gear and nut screw in the upper housing, extending or retracting an extensible shaft. Additionally, a power spring mounted coaxially around the worm gear provides a mechanical counterbalance to the weight of a lift gate on the shaft. As the shaft extends, the power spring uncoils, assisting the motor-gear assembly in raising the lift gate. Retracting the shaft recoils the spring, storing potential energy. Thus, a lower torque motor-gear assembly can be used, reducing the diameter of the lower housing. Preferably, the power spring can also drive the power screw to extend the strut even when the motor-gear assembly is not engaged.

REFERENCES:
patent: 2371336 (1945-03-01), Levon
patent: 2738972 (1956-03-01), Morris
patent: 5187993 (1993-02-01), Nicholson et al.
patent: 5295407 (1994-03-01), Hirose et al.
patent: 5367826 (1994-11-01), Wu
patent: 5944376 (1999-08-01), Buchanan, Jr.
patent: 6185868 (2001-02-01), Kato
patent: 6516567 (2003-02-01), Stone et al.
patent: 6755458 (2004-06-01), Oberheide

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