Anti-back-out fastener for applications under vibration
View Patent ↗A fastener is configured for use in a high vibration application. The fastener includes a nut including a nut body including a cam surface comprising wedge locking action fastening features and a hex shape upon an outer surface of the nut body. The nut further includes a locking washer including matching wedge locking action fastening features to the wedge locking action fastening features of the cam surface and a matching hex shape upon an outer surface of the washer to the hex shape upon the outer surface of the nut body. The nut is configured to include a threaded inner surface selected according to a bolt to be fastened and a nut wall thickness selected according to a load to be applied to the nut.
1. A fastener for use in a high vibration application, the fastener comprising:
a nut comprising:
a nut body comprising:
a cam surface comprising wedge locking action fastening features; and
a hex shape upon an outer surface of the nut body; and
a locking washer comprising:
matching wedge locking action fastening features to the wedge locking action fastening features of the cam surface; and
a matching hex shape upon an outer surface of the washer to the hex shape upon the outer surface of the nut body;
wherein the nut is configured to include:
a threaded inner surface selected according to a bolt to be fastened; and
a nut wall thickness selected according to a load to be applied to the nut; and
wherein the wedge locking action fastening features include a planar should feature cam surface configured to prevent the fastener from turning relative to the lock washer in a tightening direction and comprising a planar shoulder feature slope angle of between forty degrees and fifty degrees between the shoulder feature cam surface and a radial plane extending normal to the rotational axis of a shank of the fastener.
2. The fastener of claim 1 , wherein the nut further comprises a finished hex pattern.
3. The fastener of claim 1 , wherein the nut wall thickness selected according to the load to be applied to the nut comprises a minimum nut wall thickness selected according to the load to be applied to the nut; and
wherein an actual nut wall thickness is selected according to a next larger standardized hex size as compared to the minimum nut wall thickness.
4. The fastener of claim 1 , wherein the nut body comprises a pilot potion including a flared section configured to rotatingly attach the locking washer to the nut body.
5. The fastener of claim 1 , wherein a surface area of a cam surface of the locking washer facing a part being fastened is greater than a surface area of the cam surface of the nut body.
6. The fastener of claim 1 , wherein the nut wall thickness selected according to the load to be applied to the nut comprises a preliminary nut wall thickness selected according to the load to be applied to the nut;
wherein an actual nut wall thickness is selected based upon modifying the preliminary nut wall thickness by a structural application factor.
7. The fastener of claim 6 , wherein the nut comprises a heavy hex nut.
8. The fastener of claim 1 , wherein the nut wall thickness selected according to the load to be applied to the nut comprises a preliminary nut wall thickness selected according to the load to be applied to the nut;
wherein an actual nut wall thickness is selected based upon modifying the preliminary nut wall thickness by a high vibration factor.
9. A fastener for use in a high vibration application, the fastener comprising:
a nut comprising:
a nut body comprising:
a cam surface comprising wedge locking action fastening features; and
a hex shape upon an outer surface of the nut body; and
a locking washer rotatingly attached to the nut body and comprising:
matching wedge locking action fastening features to the wedge locking action fastening features of the cam surface; and
a matching hex shape upon an outer surface of the washer to the hex shape upon the outer surface of the nut body;
wherein the nut is configured to include:
a threaded inner surface selected according to a bolt to be fastened;
a surface area of the cam surface selected according to a load to be applied to the nut; and
wherein the wedge locking action fastening features include a planar shoulder feature cam surface configured to prevent the fastener from turning relative to the lock washer in a tightening direction and comprising a planar shoulder feature slope angle of between forty degrees and fifty five degrees between the shoulder feature cam surface and a radial plane extending normal to the rotational axis of a shank of the fastener.
10. The fastener of claim 9 , wherein the surface area of the cam surface selected according to the load to be applied to the nut comprises a minimum cam surface area selected according to the load to be applied to the nut; and
wherein an actual cam surface area is selected according to a next larger standardized hex size as compared to the minimum cam surface area.
11. The fastener of claim 9 , wherein a surface area of a cam surface of the locking washer facing a part being fastened is greater than the surface area of the cam surface of the nut body.
12. The fastener of claim 9 , wherein the surface area of the cam surface selected according to the load to be applied to the nut comprises a preliminary cam surface area selected according to the load to be applied to the nut;
wherein an actual cam surface area is selected based upon modifying the preliminary cam surface area by a structural application factor.
13. The fastener of claim 12 , wherein the nut comprises a heavy hex nut.
14. The fastener of claim 9 , wherein the surface area of the cam surface selected according to the load to be applied to the nut comprises a preliminary cam surface area selected according to the load to be applied to the nut;
wherein an actual cam surface area is selected based upon modifying the preliminary cam surface area by a high vibration factor.