Hammer Tie Rod Nut Assembly for High Clamp Load Without Thread Damage
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Solution Overview
Problem
Hammer tie rods require high torque values for assembly, which can damage threading and make it difficult to achieve desired clamping loads, and existing solutions do not effectively manage torque distribution to prevent damage during assembly and disassembly.
Innovation Solution
A method and kit using a nut assembly with different orientations and counterbores to apply varying tension forces, allowing for efficient assembly and disassembly of hammer tie rods by distributing torque effectively and preventing damage to threading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high torque values are applied to achieve desired clamping load, then the clamp load is sufficient, but the threading of nut or collar is damaged
Solution Approach 1:
The method applies preliminary tensioning forces in multiple incremental steps (first tensioning force, then second tensioning force) before achieving the final high clamp load. This preliminary action allows the threading to gradually adapt to the increasing load without sudden stress that would cause damage.
Solution Approach 2:
The tensioning process uses periodic application of force with distinct phases: applying first tensioning force with nut in first orientation, then applying second tensioning force with nut in second orientation. This periodic action distributes the total torque requirement across multiple controlled applications, preventing threading damage while achieving the required clamp load.
2Force
If high torque values are applied to achieve desired clamping load, then the clamp load is sufficient, but it becomes difficult to achieve during assembly
Solution Approach 1:
The single high-torque application is segmented into multiple lower-torque applications. The first tensioning force is applied in the first orientation, then the nut is reoriented and the second tensioning force is applied. This segmentation makes the assembly process manageable and achievable during actual assembly operations.
Solution Approach 2:
The nut assembly dynamically changes orientation between applying the first and second tensioning forces. This dynamic reorientation allows the operator to access different sides of the nut and apply forces from different directions, making the assembly process more controllable and easier to perform than applying a single high torque from one orientation.
3Device complexity
If single orientation tensioning is used, then the assembly process is simple, but the torque distribution is uneven and causes threading damage
Solution Approach 1:
The nut assembly utilizes asymmetric orientation - the first orientation applies tension in one direction, then the nut is rotated to a second orientation (opposite direction) to apply additional tension. This asymmetric approach to force application from different orientations creates more uniform torque distribution across the threading interface, preventing damage while maintaining relatively simple assembly procedures.
Data Source
AI summary
Systems and methods can include applying, using a nut assembly including a first nut and a plurality of fasteners provided in respective threaded holes of the first nut, a first tensioning force for a stud of a hammer assembly. The systems and methods can also include applying, using the nut assembly, a second tensioning force for the stud of the hammer assembly. The first tensioning force can be applied with the first nut in a first orientation whereby a first end surface of the first nut faces a first direction and a second end surface of the first nut faces a second direction opposite the first direction. The second tensioning force can be applied with the first nut in a second orientation whereby the first end surface of the first nut faces the second direction and the second end surface of the first nut faces the first direction. The second tensioning force can be greater than the first tensioning force.