D-Shaped J-Bolt Hook Geometry for Multi-Axle Clamping
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Solution Overview
Problem
Existing J-bolts fail to accommodate various sizes of vehicle axles, particularly larger ones, leading to undue stress and reduced service life due to inadequate clamping force and compatibility issues.
Innovation Solution
A high strength J-bolt with a D-shaped cross-section and increased inside bend radius at the hook end, providing a higher section modulus and larger cross-sectional area, designed to maximize clamping force and resist mechanical failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a standard J-bolt design is used, then it can accommodate smaller axles, but it causes undue stress and reduced service life when used with larger axles
Solution Approach 1:
The J-bolt features a non-uniform cross-sectional design where the hook end has a larger cross-sectional area than the distal end. This local quality variation concentrates the higher section modulus at the hook end where bending stress is highest during operation with larger axles, thereby preventing undue stress and extending service life while maintaining compatibility across different axle sizes.
2Force
If a J-bolt with larger cross-sectional area is used to increase clamping force, then the clamping force on the axle is maximized, but the device complexity increases
Solution Approach 1:
The J-bolt employs an asymmetric cross-sectional design along its length, with the hook end having a larger cross-sectional area than the distal end. This asymmetric geometry strategically places the increased section modulus at the hook end where bending moments are highest during operation, maximizing clamping force effectiveness while avoiding unnecessary material in lower-stress regions, thus limiting overall structural complexity.
3Reliability
If the inside bend radius at the hook end is increased to reduce tensile stress, then the service life is extended, but the manufacturing precision requirements increase
Solution Approach 1:
The invention specifies a particular inside bend radius parameter at the hook end that is larger than conventional designs. This parameter change reduces tensile stress concentration during operation by distributing stresses more evenly across the hook end cross-section. While this does require precise manufacturing, the benefit of extended service life through reduced stress concentration outweighs the increased manufacturing precision requirement.
Data Source
AI summary
A high strength J-bolt for a saddle-mount is provided for use in attaching the saddle-mount to an axle of a vehicle. The high strength J-bolt can include a round distal end, a tapered and/or round mid-section, and a hook end with a specified inside bend radius and cross-sectional shape configured to accommodate an increased range of axle sizes. A D-shaped cross-sectional shape can be formed for the hook end to provide for increased contact area with the axle, a larger cross-sectional area, and a higher section modulus along a critical bending axis as compared to a non-critical bending axis to maximize a clamping force that can be applied to the axle and militate against mechanical failure of the high strength J-bolt. A hot forging process can be used to form the shape of the high strength J-bolt.