T-Shaped Chuck Jaw Structure to Reduce Top Jaw Lifting
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Solution Overview
Problem
The existing chuck mechanism experiences increased axial lifting of the top jaw due to reduced rigidity and increased reaction forces when holding large-diameter works, particularly when a large through hole is formed in the chuck body without changing its outer diameter, leading to deformation and instability.
Innovation Solution
A chuck mechanism with a T-shaped guide groove in the chuck body and a master jaw having a narrow and wide portion, where the wedge is positioned outward in the width direction within the wide portion, reducing the displacement and supporting the area that receives reaction forces, thereby enhancing rigidity and minimizing lifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large through hole is formed in the chuck body without changing the outer diameter, then the chuck body can accommodate large-diameter works, but the thickness and rigidity of the chuck body are reduced, causing increased elastic deformation and lifting of the top jaw
Solution Approach 1:
The master jaw is divided into a narrow portion and a wide portion, with the wide portion providing an extended area to receive reaction forces. This segmentation allows the structure to accommodate large-diameter works through the extended wide portion while maintaining sufficient rigidity through the reinforced area at the wide portion that receives reaction forces from the plunger and work
Solution Approach 2:
The reaction force receiving area is extended in the width direction by forming the wide portion that protrudes radially outward. This dimensional extension provides additional support area without increasing the axial thickness of the chuck body, thereby maintaining rigidity while accommodating larger workpieces
2Device complexity
If the master jaw has a thin area to receive reaction forces, then the structure remains simple, but the rigidity is low causing elastic deformation and increased lifting of the top jaw
Solution Approach 1:
The master jaw is segmented into a narrow portion and a wide portion, where the wide portion specifically serves to receive reaction forces. This segmentation reinforces the reaction force receiving area without complicating the overall structure, as the wide portion is a straightforward geometric extension
Solution Approach 2:
The wide portion is formed only in the specific area where reaction forces need to be received, rather than uniformly thickening the entire master jaw. This localized reinforcement maintains simplicity in other areas while providing the necessary rigidity where reaction forces are applied
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces the lifting of the top jaw during work holding by increasing the rigidity of the chuck body and master jaw, maintaining stability even when processing large-diameter works without increasing the outer diameter of the chuck body.
Implementation Method 1
a master jaw that is disposed in an axially front face of the chuck body and is radially movable by wedge action caused by fitting the plunger in the master jaw
Data Source
AI summary
The chuck mechanism includes: a chuck body 10; an axially movable plunger 40 disposed inside the chuck body; and a master jaw 20 radially movable by wedge action caused by fitting the plunger in the master jaw 20. A guide groove 11 that radially guides the master jaw and has a T-shaped cross section is formed in the chuck body. The master jaw has a narrow portion 23 and a wide portion 24 that form a T-shaped cross section. A wedge 21 fitted in a wedge groove 41 of the plunger is formed radially inside the wide portion. The end face 21a of the wedge in the width direction is positioned outward in the width direction with respect to the end face 23a of the narrow portion in the width direction.