Rotation rod assembly with self lubricating liner or grooved bushings
View Patent ↗A rotation rod assembly includes a first linkage rod having a first bore extending therein. The rotation rod assembly includes a second linkage rod having a piston section extending axially therefrom, the piston section is disposed for rotation in the first bore. The piston section is axially restrained in the bore. The piston section has a self-lubricating liner secured to at least one outer surface thereof. The self-lubricating liner is in sliding engagement with portions of the bore. The liner is secured to the radially and/or axially outer surfaces of the piston section and has at least one groove therein for collection of wear materials and debris.
1. A rotation rod assembly comprising:
a first linkage rod having a first annular body portion fixedly secured to and extending axially therefrom, the first annular body portion having an inner surface defining a first bore axially extending partially into the first annular body portion, the first annular body portion having a first axial end and second axial end, the first axial end being closed and the second axial end having an opening with a plug adjustably secured therein, the plug having a second bore extending therethrough, the first linkage rod being fixedly secured to a frame;
a second linkage rod having a piston section extending axially therefrom, the piston section being coaxial with the first linkage rod and the plug, the piston section being disposed for rotation in the first bore, the inner surface surrounding the piston section, the second linkage rod extending through the second bore and rotatable relative to the plug, the piston section being axially restrained by the first end and the plug; and
the piston section having a self-lubricating liner secured to at least one outer surface of the piston section and the self-lubricating liner being in sliding engagement with portions of the inner surface, the first end and a portion of the plug;
wherein the liner is secured to the radially and/or axially outer surfaces of the piston section and has at least one groove therein for collection of wear materials and debris.
2. The rotation rod assembly of claim 1 , wherein the self-lubricating liner defines a first circumferential surface and a second circumferential surface.
3. The rotation rod assembly of claim 1 , wherein the self-lubricating liner defines a first axial surface and a second axial surface.
4. The rotation rod assembly of claim 1 , wherein the piston section defines a first lobe and a second lobe separated from one another and connected to one another by a shaft.
5. The rotation rod assembly of claim 1 , wherein the fixed member comprises an aluminum alloy.
6. The rotation rod assembly of claim 1 , wherein the inner surface is anodized according to any of the types specified in the MIL-A-8625 specification (amended 2003) for aluminum anodize.
7. The rotation rod assembly of claim 1 , wherein the inner surface is coated with a chemical film conversion coating.
8. The rotation rod assembly of claim 7 , wherein the chemical film conversion coating comprises an anodized coating.
9. The rotation rod assembly of claim 2 , wherein each of the first circumferential surface and the second circumferential surface has a hard anodized treatment thereon.
10. The rotation rod assembly of claim 9 , wherein the hard anodized treatment is pursuant to MIL-A-8625 Type III (amended 2003).
11. The rotation rod assembly of claim 1 , wherein the self-lubricating liner comprises Polytetrafluoroethylene (PTFE).
12. A rotation rod assembly comprising:
a first linkage rod having a first annular body portion fixedly secured to and extending axially therefrom, the first annular body portion having an inner surface defining a first bore axially extending partially into the first annular body portion, the first annular body portion having a first axial end and second axial end, the first axial end being closed and the second axial end having an opening with a plug adjustably secured therein, the plug having a second bore extending therethrough, the first linkage rod being fixedly secured to a frame;
a second linkage rod having a piston section extending axially therefrom, the piston section being coaxial with the first linkage rod and the plug, the piston section being disposed for rotation in the first bore, the inner surface surrounding the piston section, the second linkage rod extending through the second bore and rotatable relative to the plug, the piston section being axially restrained by the first end and the plug;
the piston section having at least one of first bushing and second bushing secured to at least one outer surface of the piston section, at least one of the first bushing and the second bushing having a lubrication groove formed in an axially and a radially outer surface thereof, at least one of the first bushing and the second bushing being in sliding engagement with portions of the inner surface, the first end and a portion of the plug;
a barrier for preventing flow of the grease inside the piston section; and
a flow path for conveying grease around the piston section, the flow path comprising a first radial circuit in the first bushing, a first axial circuit in the first bushing, a second axial circuit around a radial outer surface of the piston section, a third axial circuit in the second bushing, and a second radial circuit in the second bushing.
13. The rotation rod assembly of claim 12 , wherein the at least one of the first bushing and the second bushing comprise an aluminum bronze material.