Drill Chuck Undivided Threaded Ring Locking Sleeve Design
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Solution Overview
Problem
Existing drill chucks with a divided threaded ring require complex assembly and suffer from high wear of the locking element due to the thin thrust collar, which increases manufacturing and assembly costs and affects precision.
Innovation Solution
Designing an undivided threaded ring with a locking sleeve that is rotationally fixed and axially immovable, which carries the ring of locking recesses, providing axial, radial, and centering security, and allowing for precise fabrication without deformation, and using an adjusting sleeve with a control cam for precise locking element adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a divided threaded ring is used and placed in a circumferential groove, then assembly can be performed from the axial direction, but the assembly process becomes complex and requires a working direction rotated by 90° which disrupts automated assembly
Solution Approach 1:
The threaded ring is divided into two halves that can be assembled separately into the chuck body from the axial direction, then joined together. This segmentation allows the assembly to proceed from the axial direction without requiring 90° rotation, maintaining compatibility with automated assembly processes while simplifying the overall assembly procedure.
2Length of stationary object
If the locking recesses are formed on a thrust collar with thickness of only approximately 1 mm, then the structure is compact, but the locking element is exposed to relatively high wear
Solution Approach 1:
The locking recesses are moved from the axial dimension (thrust collar) to the radial dimension (locking ring surrounding the threaded ring). This dimensional transition allows the locking element to engage with a much thicker structure (the locking ring), dramatically reducing wear while maintaining the compact axial profile of the thrust collar.
3Manufacturing precision
If the threaded ring is hardened to achieve very high fabrication precision, then manufacturing precision is improved, but the hardening process causes slight deformation of the threaded ring
Solution Approach 1:
The locking ring is designed with built-in compensation features that anticipate and counteract the deformation caused by hardening. The radial positioning and centering mechanisms are pre-configured to accommodate slight shape changes, ensuring that the threaded ring maintains its functional precision despite the deformation introduced during the hardening process.
Data Source
AI summary
A drill chuck having a chuck body connectable to a drilling spindle, in which are arranged clamping jaws in guide seats extending at an angle to the chuck axis, which are movable for opening and closing via a threaded ring that is arranged to be immovable relative to the chuck body. A locking device includes a coaxial ring of locking recesses as well as a locking element that is engaged in the locking recesses under the force of a locking spring. An adjusting ring rotatable to a limited extent between stops, the rotation of which adjusts the locking element. A detent device creating two detent positions in the circumferential direction. Attached to the axially forward section of the chuck body in a rotationally fixed and axially immovable manner is a locking sleeve that carries the ring of locking recesses and serves to axially secure the threaded ring.