Patent ID: 7341414
Filing Date: 2008-03-11
Classification: F16B

Abstract:
1. A fastener joint that reduces stress failure in an internal combustion engine component, the fastener joint comprising: a threaded hole in the internal combustion engine component; and a threaded fastener having a threaded tip portion with a radius and a distal end, the threaded tip portion being inserted into the threaded hole of the internal combustion engine component to engage the threaded hole, and define a threaded interface between the threaded hole in the internal combustion engine component and the threaded tip portion; wherein the threaded fastener includes a stress reduction means for increasing load carrying capability of at least a portion of the threaded interface between the threaded hole in the internal combustion engine component and the threaded tip portion; wherein the threaded tip portion includes an axially extending hole at the distal end with the axially extending hole having an opening at the distal end and a hole end positioned at a depth away from the distal end, the axially extending hole including a progressively reduced diameter portion extending continuously from the opening at the distal end to the hole end.