Circular-shank tool clamping sleeve with asymmetric centering
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Solution Overview
Problem
Existing round-shaft chisels face difficulties in easily fitting the clamping sleeve onto the shank and achieving proper centering, leading to axial and radial play, which affects the secure rotation of the shank within the clamping sleeve.
Innovation Solution
The clamping sleeve is designed with holding elements symmetrically positioned around the central transverse plane, featuring beveled outer edges and concave centering sections, allowing for easy alignment and minimal axial play, while the holding elements are punched or pressed to extend over a portion of the circumference, ensuring stable mounting and reduced radial play.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the holding elements and circumferential groove are arranged in the end region of the shank or clamping sleeve, then the axial position is well secured, but the correct position of end faces must be ensured during fitting and centering is not improved
Solution Approach 1:
The holding elements are positioned asymmetrically in the central transverse plane rather than in the end region, creating a unique orientation reference that automatically guides correct positioning during assembly while maintaining axial location precision
2Ease of operation
If the holding elements are arranged symmetrically in the central transverse plane, then the fitting process is simplified and centering is improved, but the axial position must be secured by other means
Solution Approach 1:
While the holding elements themselves are symmetrically arranged for ease of fitting, the circumferential groove is positioned asymmetrically relative to the clamping sleeve ends, creating an automatic positioning mechanism that ensures correct axial and radial alignment during assembly
Solution Approach 2:
The concave centering sections with curved surfaces automatically guide the shank into correct radial alignment as it is inserted into the clamping sleeve, improving centering without complicating the fitting process
3Device complexity
If the clamping sleeve is designed without symmetric holding elements, then the design is simpler, but the centering and uniform rotational behavior are compromised
Solution Approach 1:
The symmetric arrangement of holding elements in the central transverse plane creates a balanced structure that provides automatic centering and ensures uniform rotational behavior throughout the operational range of the clamping sleeve
Solution Approach 2:
The concave centering sections with curved surfaces work together to provide continuous radial guidance, maintaining stable centering and smooth rotation without requiring complex additional centering mechanisms
Data Source
Figure 1~3
Figure 4
AI summary
The invention relates to a circular-shank tool (30) comprising a shank (31) that is held in the bore (41) of a tool holder (40) by means of a locking sleeve (10), said shank (31) being rotatably held in the locking sleeve (10). The locking sleeve (10) is provided with one or more retaining elements (16, 17, 18) that project inwards and engage in a peripheral groove (39) that is provided in the shank (31) of the tool (30), thus indisplaceably securing the locking sleeve (10) in an axial direction on the shank (31) of the tool. Since the locking sleeve (20) is mirror-symmetrical to the central transversal plane (38), it can be fixed to the shank (31) in a position that has been rotated through 180°.