Machine element or mechanism – Gearing – Directly cooperating gears
Patent
1989-03-13
1990-10-23
Falk, Joseph
Machine element or mechanism
Gearing
Directly cooperating gears
744248R, F18H 116
Patent
active
049643142
ABSTRACT:
An apparatus for converting rotary motion to linear motion includes a centrally located screw member and a concentrically positioned outer member that surrounds the screw member but is spaced therefrom in order to define an annular space between the outer member and the screw member. A plurality of planet assemblies are positioned around the screw member and within the annular space. Each planet assembly is comprised of a roller that has a plurality of annular grooves extending circumferentially around its exterior surface. Each pair of adjacent grooves define a ridge therebetween whereby each roller has a plurality of spaced annular ridges extending circumferentially around its exterior surface. The ridges on the rollers engage the helical thread on the screw member as well as annular grooves on the inner surface of the outer member. The outer diameter of the planet assemblies is at least equal to the outside diameter of the screw member. Further, a planet assembly carrier can be provided for holding the planet assemblies and for maintaining the planet assemblies in a symmetrical arrangement around the screw member.
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Anderson Gerald A.
Falk Joseph
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