Drill Chuck Locking Sleeve Damping Against Vibration Loosening
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Solution Overview
Problem
Conventional drill chucks face challenges in maintaining the interlocking system closed under high power and vibrations during percussion drilling or screw coupling, and may loosen due to spindle stop abrupt lag.
Innovation Solution
Incorporating a dampener between the adjusting sleeve and an adjacent component radially inside, which increases the torque required to deactivate the interlocking device, preventing disengagement from vibrations, and using an elastic O-ring dampener in a groove for enhanced clamping force and ease of mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the interlocking system is designed to be simple and easy to operate, then ease of operation is improved, but reliability deteriorates under high power and vibrations
Solution Approach 1:
A dampener is arranged between the adjusting sleeve and the intermediate sleeve to provide beforehand cushioning against vibrations and shocks. This dampener increases the torque required to deactivate the interlocking device, preventing accidental disengagement during percussion drilling or screw coupling operations while maintaining the simplicity of the interlocking mechanism.
2Reliability
If the dampener is arranged between the adjusting sleeve and the chuck body, then reliability is improved, but device complexity increases and clamping force is impaired
Solution Approach 1:
An intermediate sleeve is introduced as an intermediary component between the adjusting sleeve and the chuck body. The dampener is arranged between the adjusting sleeve and this intermediate sleeve, which simplifies the overall structure and maintains achievable clamping force while still providing the necessary vibration damping to prevent interlocking system loosening.
3Manufacturing precision
If the dampener is arranged in a groove close to the base, then manufacturing precision is improved, but reliability deteriorates due to reduced damping effect
Solution Approach 1:
The groove for accommodating the dampener is designed with specific local characteristics: it runs in the circumferential direction of the adjusting sleeve, and the dampener is positioned at a defined distance from the base. This local quality optimization ensures both manufacturability and sufficient damping effect to prevent interlocking system disengagement under vibrations.
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 enhances the drill chuck's ability to withstand vibrations and maintain clamping force, ensuring the interlocking system remains secure even under strong acceleration forces, while simplifying the design and mounting process.
Implementation Method 1
a dampener being arranged between the adjusting sleeve and the component adjacent thereto radially on the inside. The arrangement of a dampener between the adjusting sleeve and the component adjacent thereto radially to the inside achieves the fact that the torque needed to deactivate the interlocking device is increased, so that the occurring vibrations are not sufficient to disengage the locking member from the locking toothings.
Implementation Method 2
It has proven to be successful if the dampener is formed by an elastic O ring, so that the dampener may also be easily pretensioned, due to the expansion in the groove suitably designed for this purpose by means of the component situated radially to the inside.
Data Source
AI summary
A drill chuck having a chuck body connectable to a drill spindle, in which clamping jaws are arranged in guide receptacles which run at an incline to the chuck axis and, for the purpose of opening and closing, are adjustable by a threaded ring arranged so as to be rotatable and axially immovable with respect to the chuck body. A locking device, which is made up of a coaxial circle of locking recesses and of at least one locking member, is engaged with the locking recesses under the force of a locking spring. A locking adjusting, is rotatable to a limited extent between end stops and whose rotation allows the locking member to be adjusted. A latching device forms two latching positions in the circumferential direction. A dampener is arranged between the adjusting sleeve and the component adjacent thereto radially to the inside.