Fatigue bushing assembly
AssigneeMcDonnell Douglas Corporation
InventorEugene R. Speakman
Life of this patent
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Abstract
A bushing for use in high strength materials where fatigue failure is a problem. The bushing is cylindrical and includes a circumferential lubrication groove on its inner surface while fillets and smooth transition surfaces are used to transition between the major cylindrical surfaces of the bushing and the housing. The bushing is pressed into the housing which is an interference fit therewith to reduce stress concentrations. Lubricant is provided to the circumferential lubrication groove by means of a passageway which may include a smooth wall annulus placed in a stepped hole in the housing and retained in the hole by a hollow screw which extends to the area of lubrication. A standard lubrication fitting is threaded into the annulus to provide means for connection to conventional lubricant supplying apparatus.
Claims16
A bushing assembly for use in high strength housings where fatigue failure is a problem, the bushing assembly including:
- a bushing having inner and outer surfaces of revolution with a wall therebetween and first and second end portions, said inner surface having a circumferential lubrication groove defined therein between said first and second end portions, said first end portion having a smooth radiused corner portion at the intersection thereof with said outer surface and said wall defining a lubricant passageway from said lubrication groove through said outer surface for transmission of lubricant to said lubrication groove.
A bushing assembly for use in high strength housings where fatigue failure is a problem, the bushing assembly including:
- a bushing having inner and outer surfaces of revolution with a wall therebetween and lubricant transmission means in said wall for transmitting the lubricant through said wall from said outer surface to said inner surface;
- and
- lubricant means in general alignment with said lubricant transmission means, said lubricant means including an annulus having a lubricant fitting on one end thereof, threaded connection means on the other end thereof and torque application means therebetween, said annulus defining a lubricant passageway between said fitting and said threaded connection means, and a hollow screw having a head end with torque application means adjacent said lubricant transmission means and an opposite threaded end, whereby said hollow screw is threadably connected to said annulus to form a pathway for the lubricant from said lubricant fitting to said lubricant transmission means.
Dependencies are inferred from the claim text.