Hydraulic Tool Holder Sleeve Structure for Stable Tool Insertion
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Solution Overview
Problem
Existing tool holders with smaller radial widths are prone to radial inward deformation when holding force is applied, leading to a decrease in the inner diameter of the tool insertion space, making it difficult to insert tools.
Innovation Solution
A tool holder design featuring a tubular shape with pressurizing chambers and grip parts that include an extended chamber communicating with the rear end of the pressurizing chamber, which reduces the radial inward deformation of the inner peripheral surface, maintaining the inner diameter of the tool insertion space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the radial width of the tool holder is reduced to accommodate smaller diameter tools, then the tool holder can be used for smaller tools, but the inner peripheral surface is more prone to radial inward deformation when holding force is applied
Solution Approach 1:
The patent applies local quality by creating a grip part with different structural properties than the body member. The grip part has a thinner wall thickness specifically at the location where tool holding occurs, allowing it to deform radially inward under pressurized fluid to grip the tool. The body member maintains sufficient wall thickness to resist radial deformation and maintain the tool insertion space inner diameter. This localized structural differentiation resolves the contradiction between accommodating small tools and maintaining inner diameter stability.
Solution Approach 2:
The tool holder is segmented into functionally distinct parts: the body member that provides structural support and maintains the tool insertion space, and the grip part that performs the actual tool holding function. This segmentation allows each part to be optimized for its specific function - the body member for dimensional stability and the grip part for adaptive tool gripping - thereby resolving the contradiction between adaptability and stability.
2Reliability
If the wall thickness of the grip part is reduced to enable effective tool holding through elastic deformation, then the gripping capability is improved, but the inner diameter of the tool insertion space decreases making tool insertion difficult
Solution Approach 1:
The grip part is designed to be dynamically deformable under pressurized fluid action. When tool holding is required, pressurized fluid causes the grip part to elastically deform radially inward, reducing its inner diameter to grip the tool securely. When tool insertion is required, the pressurized fluid is released and the grip part returns to its original larger diameter state, facilitating easy tool insertion. This dynamic behavior resolves the contradiction between reliable tool holding and easy tool insertion.
Solution Approach 2:
The grip part undergoes periodic deformation cycles - expanding to a larger diameter for tool insertion, then contracting to a smaller diameter for tool holding. This periodic action between two distinct states (insertion state and holding state) allows the system to alternate between ease of operation and reliable tool holding, resolving the contradiction between these two requirements.
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 tool holder effectively prevents the decrease in inner diameter of the tool insertion space, ensuring easy insertion and holding of tools by distributing the holding force more efficiently.
Implementation Method 1
When the pressure in the pressurizing chamber is increased, the grip part elastically deforms radially inward. As a result, a tool (tool shank part), which has been inserted into a sleeve interior space, is held by the portion of the sleeve inner peripheral surface that corresponds to the grip part.
Implementation Method 2
A tool holder design featuring a tubular shape with pressurizing chambers and grip parts that include an extended chamber communicating with the rear end of the pressurizing chamber, which reduces the radial inward deformation of the inner peripheral surface, maintaining the inner diameter of the tool insertion space.
Data Source
AI summary
A tool holder (100) for holding a tool (200) has pressurizing chambers (123a, 123b) provided between a body member inner peripheral surface (111) of a body member (110) and a sleeve outer peripheral surface (122) of a sleeve (120). Grip parts (124a, 124b) are provided between the sleeve outer peripheral surface and a sleeve inner peripheral surface (121) and are elastically deformed radially inward when pressure in the pressurizing chambers is increased. An extended chamber (123d) is defined between the sleeve outer peripheral surface and the body member inner peripheral surface, fluidly communicates with the pressurizing chamber and extends in an axial direction and in a circumferential direction. The extended chamber curtails radially inward elastic deformation of a portion of the body member inner peripheral surface, which corresponds to one of the grip parts, when a pressing force is received on a body member outer peripheral surface (112).