Polygonal Connecting Rod Torque Control
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Solution Overview
Problem
Conventional connecting rod assemblies apply excessive torque to small-diameter bolts during rotation, leading to difficulty in controlling the torque and potential damage due to the significant increase in torque with minor torsion angle changes.
Innovation Solution
A two-torque-producing connecting rod assembly with a polygonal rod having different diameter sections and a hollow cylindrical connecting member with arc-shaped concave and convex portions, allowing for controlled torque application by restricting rotation angles and providing a stepped receiving cavity for torque distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional connecting rod of uniform diameter is used, then the structure is simple, but the torque increases significantly with small torsion angle changes, making it difficult to control and likely damaging small-diameter bolts
Solution Approach 1:
The connecting rod is divided into multiple sections with different diameters: a first section with larger diameter for elastic deformation and torque absorption, and a second section with smaller diameter for precise torque transmission. This segmentation allows the rod to provide both torque control and structural simplicity.
Solution Approach 2:
Different sections of the connecting rod have different diameters to perform different functions. The first section (larger diameter) is designed for elastic deformation to absorb torque variations, while the second section (smaller diameter) is designed for precise torque transmission, creating local quality variations that solve the torque control problem.
2Strength
If the rod has a large diameter throughout, then the structural strength is high, but the torque applied to small-diameter bolts becomes excessive
Solution Approach 1:
The rod is segmented into a first section with larger diameter for strength and elastic deformation, and a second section with smaller diameter for controlled torque transmission to the bolt, preventing excessive force while maintaining overall structural integrity.
Solution Approach 2:
The connecting rod has local quality variations with different diameter sections. The first section has larger diameter for high strength and elastic energy absorption, while the second section has smaller diameter to limit and control the torque transmitted to small-diameter bolts, preventing damage.
3Ease of operation
If the connecting member has a simple cylindrical structure, then the manufacturing is easy, but it cannot restrict rotation angles or distribute torque effectively
Solution Approach 1:
The connecting member is segmented into a through hole for rod insertion and a receiving cavity with stepped structure. The receiving cavity includes an outer section, inner section, and middle section with different diameters, creating distinct functional zones that restrict rotation angles and distribute torque effectively while maintaining manufacturability.
Solution Approach 2:
The receiving cavity has local quality variations with different section diameters. The outer section provides initial restraint, the middle section with intermediate diameter controls rotation angles, and the inner section transmits torque, creating localized functional zones that improve operation control without excessive manufacturing complexity.
Data Source
AI summary
A two-torque-producing connecting rod assembly used in combination with a hand tool is provided with a rod and a connecting member. The rod is polygonal and includes a big first section, a small second section and a connecting portion. The connecting member is a hollow cylindrical structure sleeved on the rod and has an inserting cavity and a stepped receiving cavity. The receiving cavity includes an outer section, an inner section and a middle section which is smaller in diameter than the outer section but larger than the inner section, the outer section includes plural alternatively-arranged arc-shaped concave portions and pointed convex portions. When the first section of the rod is inserted in the outer section of the connecting member, plural angles of the first section are disposed between the arc-shaped concave portions and restricted to move between the two ends by the pointed convex portions.