Self-locking Drill Chuck Dynamics and Segmentation
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Solution Overview
Problem
Existing self-locking drill chucks often fail to maintain a reliable self-locking state during high-speed operations due to inadequate retention force, leading to potential dislodgment under reaction forces.
Innovation Solution
A self-locking drill chuck design featuring a rotating sleeve with convex leaf springs at both ends, a nut with matching grooves, and a rotatable locking block that engages with teeth on the drill body, allowing for enhanced self-locking and unlocking through compression and rotation, ensuring a stronger holding force and improved operating feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional self-locking structure with leaf spring and teeth is used in the drill chuck, then the structure can maintain self-locking state under normal conditions, but under high-speed rotation the retention force becomes inadequate leading to self-locking failure
Solution Approach 1:
The patent introduces a dynamic self-locking mechanism where the locking block can rotate between locked and unlocked positions based on operational conditions. The locking block is positioned by the leaf spring under normal conditions, but can be rotated by the first part of the rotating sleeve during high-speed operation to engage additional teeth on the drill body, dynamically adapting the retention force to match operational demands.
Solution Approach 2:
The self-locking structure is segmented into multiple functional components: a locking block with multiple engagement positions, a leaf spring for initial positioning, and a rotating sleeve with distinct first and second parts. This segmentation allows each component to contribute differently to the self-locking mechanism under various operational conditions, with the locking block engaging different sets of teeth based on rotation speed.
2Force
If the locking block is made rotatable to engage with teeth on the drill body for self-locking, then stronger holding force is achieved, but the structure complexity increases
Solution Approach 1:
The locking block serves multiple functions: it is positioned by the leaf spring under normal conditions for standard self-locking, and can be rotated by the rotating sleeve to engage additional teeth when higher holding force is needed during high-speed operation. This multi-functionality allows a single component to adapt to different operational requirements without requiring entirely separate mechanisms.
Solution Approach 2:
The patent merges the leaf spring positioning mechanism with the rotating sleeve actuation mechanism into a unified self-locking system. The locking block integrates both the leaf spring engagement feature and the rotating sleeve engagement feature, combining two potential locking mechanisms into one cohesive structure that automatically selects the appropriate locking mode based on operational conditions.
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 design effectively maintains a self-locking state with a stronger holding force, preventing dislodgment and enhancing the operating experience by ensuring reliable engagement and disengagement of the drill chuck.
Implementation Method 1
by compressing the leaf spring via the first part, the leaf spring compresses the locking block, to rotate the locking block and engage with teeth on the drill body
Implementation Method 2
through compressing the locking block by the second part, the locking block reverses to break away from the tooth
Data Source
AI summary
The present invention provide a self-locking drill chuck, its rotating sleeve is provided with a convex leaf spring fixed to a rotating sleeve at both ends, its nut or ring fixedly connected with the nut are provided with a first groove and a second groove matching with the convex portion of the leaf spring; the self-locking structure includes a ring tooth on the drill body and rotatable locking block arranged on the nut or ring fixedly connected to the nut, the nut or ring fixedly connected to the nut is provided with a leaf spring, the rotating sleeve is provided with a first part compressing the leaf spring and a second part compressing the locking block. This invention can achieve positioning matching between metals, which has a stronger holding force for maintaining self-locking state of the drill chuck, greatly enhancing the operating feel.