Eccentric Locking Bolt Structure for Vibration-Resistant Fastening
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Solution Overview
Problem
Conventional bolt locking techniques using wire are cumbersome, requiring two bolts and two bolt holes, and are difficult to operate, while also being prone to loosening under vibration or impact.
Innovation Solution
A locking bolt design comprising a first bolt with a bolt head and a second bolt with a threaded tip, featuring an eccentric columnar portion and a cylindrical hole that aligns to create a single bolt-like state, allowing for easy and rapid antiloosening by rotating the second bolt relative to the first bolt within a bolt hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional locking-wire technique is used to prevent bolt loosening, then antiloosening capability is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent merges two separate bolts into a single integrated locking bolt that combines a first bolt body with a second bolt portion featuring an eccentric columnar portion. This unified structure engages with a single bolt hole while providing both fastening and locking functions, thereby reducing the number of components from two bolts and two bolt holes to one bolt and one bolt hole, while maintaining antiloosening capability through the eccentric mechanism.
Solution Approach 2:
The locking bolt is segmented into functional portions: a first bolt portion for fastening and a second bolt portion with an eccentric columnar portion for locking. The eccentric columnar portion can rotate relative to the first bolt portion, creating misalignment between external threads that prevents loosening. This segmentation allows each portion to specialize in its function while working together as a unified system.
2Reliability
If a conventional locking-wire technique is used to prevent bolt loosening, then antiloosening capability is improved, but ease of operation deteriorates
Solution Approach 1:
The locking mechanism is designed to be self-activating through the rotation of the second bolt portion. When the bolt is tightened, the eccentric columnar portion naturally rotates relative to the first bolt portion, causing the external threads to misalign and lock automatically. This self-locking action eliminates the need for complex manual wire installation operations, making the locking process as simple as standard bolt tightening.
3Ease of operation
If a single bolt is used instead of two bolts with wire locking, then ease of operation is improved, but antiloosening reliability may deteriorate
Solution Approach 1:
The second bolt portion incorporates an asymmetric eccentric columnar portion with a specific eccentricity distance from the central axis. This asymmetric geometry ensures that when the bolt is tightened, the external threads of the first and second bolt portions become misaligned, creating a mechanical lock that prevents rotation and loosening. The asymmetric design transforms the simple act of tightening into an automatic locking action, maintaining high reliability with a single bolt structure.
Data Source
AI summary
Provided in the context of a bolt is a method for achieving antiloosening capability such as will make it possible for tightening operations to be carried out easily and rapidly, and such as will make it possible to obtain antiloosening effect in robust and reliable fashion. Comprised, in such form as if a single bolt had been cut into two perpendicularly with respect to an axis thereof at a location midway along the axis thereof, of first bolt 11 having a bolt head and second bolt 12 having a threaded tip; second bolt 12 being such that an eccentric columnar portion 123 which is smaller in diameter than a diameter of the shaft of the second bolt 12 is provided at cutting plane 122 in such fashion as to protrude outward in an axial direction in eccentric fashion with respect to a direction perpendicular to a central axis, and such that side face protrusion 124 is formed at an outside circumferential side face of eccentric columnar portion 123; first bolt 11 being such that eccentric cylindrical portion 113 that mates with eccentric columnar portion 123 is formed at cutting plane 112 in eccentric fashion with respect to a direction perpendicular to a central axis, axial groove 114 being formed in a direction parallel to the central axis and radial groove 115 being formed in a radial direction at the interior thereof; the entirety constituting locking bolt 1.