Hydraulic Expansion Chuck With Multi-Chamber Tool Clamping
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Solution Overview
Problem
Existing hydraulic expansion chucks have limited tool clamping strength and concentricity due to axially narrow clamping areas, which are achieved by a single pressure chamber bulging against the tool, leading to inefficient clamping and potential tool misalignment.
Innovation Solution
The hydraulic expansion chuck features multiple axially spaced pressure chambers and channels that bulge around the central receiving opening, providing multi-point clamping and secure tool fixation, utilizing 3D printing technology to create complex geometries for enhanced clamping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pressure chamber is used to clamp the tool, then the structure is simple, but the clamping strength and tool concentricity are limited
Solution Approach 1:
The single pressure chamber is divided into multiple pressure chambers (first, second, and third pressure chambers) arranged axially at different positions. Each pressure chamber independently bulges against the tool at different locations, providing multi-point clamping. This segmentation increases clamping strength and improves tool concentricity while maintaining reasonable structural complexity through systematic arrangement of the divided chambers.
2Area of stationary object
If a single pressure chamber bulges against the tool, then the clamping area is concentrated, but the clamping range is narrow and tool concentricity is poor
Solution Approach 1:
The clamping action is extended from a single concentrated point in one location to multiple distributed points across different axial dimensions. The first, second, and third pressure chambers are positioned at different axial heights, creating a three-dimensional clamping distribution. This multi-dimensional arrangement ensures the tool is clamped uniformly at multiple locations, significantly improving tool concentricity and centering accuracy while expanding the effective clamping range.
3Strength
If multiple axially spaced pressure chambers are used, then multi-point clamping is achieved, but the device complexity increases
Solution Approach 1:
Multiple pressure chambers are merged into a single integrated expansion bushing structure. The first, second, and third pressure chambers are formed as unified components within the expansion bushing, sharing common structural elements and integration with the base body. This merging approach provides multi-point clamping strength equivalent to separate systems while reducing overall device complexity through consolidation and standardized integration.
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
This design achieves secure, all-round clamping with improved tool concentricity and stability, allowing for the production of complex tool geometries cost-effectively by combining 3D printing with conventional manufacturing methods.
Implementation Method 1
at least two pressure chambers which are formed circumferentially around the central receiving opening, arranged at an axial distance from one another, connected to one another by at least one channel and, when pressure is applied, can be bulged against the tool received in the central receiving opening
Implementation Method 2
the pressure chamber expands or bulges against a tool received in the central receiving opening of the expansion bushing
Implementation Method 3
the expansion bushing is inserted in a form-fitting, force-fitting and/or material-fitting manner
Implementation Method 4
force-fitting
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
The invention relates to a hydraulic expanding chuck for gripping a tool, for example a drill or a milling tool, comprising: a clamping part (3) having an expansion sleeve (1) having a central receiving opening for receiving and clamping the tool; and a connection part (4), in particular having a HSK connection (2). According to the invention, the expansion sleeve (1) has at least two pressure chambers (5), which are designed to run around the central receiving opening, which are arranged at an axial distance relative to one another, and which can bulge when the tool received in the central receiving opening is subjected to fluid pressure. The at least two pressure chambers (5) are connected to one another by a fluid channel (6).