Expansible Chuck Stepped Flange Centering Torque
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing expansible chucks fail to properly center within hollow cores during winding or unwinding operations, leading to slippage due to inadequate clearance and uneven gripping, which results in inefficient torque transmission.
Innovation Solution
The chuck design features a stepped portion near the flange with a diameter slightly larger than the distal portion, allowing the chuck to center within the core and enabling the expansion elements to uniformly grip the core, preventing slippage by ensuring proper alignment and torque transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the clearance between the chuck and core is increased to allow insertion, then the chuck can be inserted into the core, but the chuck cannot be properly centered and uniform gripping is achieved
Solution Approach 1:
The stepped portion is provided on the chuck body before insertion into the core. This preliminary structural feature ensures that when the chuck is inserted with adequate clearance, the stepped portion automatically contacts the core inner surface and establishes proper centering, eliminating the need for additional centering operations or tight clearance fits.
2Strength
If the chuck diameter is increased to improve gripping, then the gripping force is improved, but the insertion into the core becomes difficult
Solution Approach 1:
The chuck body is segmented into different diameter portions along its axial length. The distal portion has a smaller diameter for easy insertion into the core, while the stepped portion has a larger diameter for providing adequate gripping force and contact with the core inner surface. This segmentation allows both insertion ease and gripping strength to be optimized independently.
Solution Approach 2:
Different portions of the chuck body are given different diameters to perform different functions. The distal portion is designed with a smaller diameter specifically for insertion purposes, while the stepped portion is designed with a larger diameter specifically for gripping and torque transmission, creating local quality variations that optimize overall performance.
3Manufacturing precision
If the clearance is reduced to improve centering, then the centering is improved, but the insertion becomes difficult and slippage occurs
Solution Approach 1:
The stepped portion is pre-configured on the chuck body to automatically perform the centering function upon insertion. This preliminary structural feature ensures that proper centering is achieved without requiring reduced clearance, thereby maintaining adequate clearance for reliable insertion while simultaneously achieving accurate centering.
Data Source
AI summary
An expansible chuck for holding hollow cylindrical cores used for winding and unwinding sheet material. A portion of the chuck body nearest the flange is stepped up so that the diameter of the chuck near the flange is slightly larger than the diameter of the rest of the chuck. The stepped up portion centers the chuck within the core which helps the expanding elements to uniformly grip the core.