Clamping Device Drawbar with Segmented Cam Shaft
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Solution Overview
Problem
Prior clamping devices have a large drawbar cross-sectional dimension due to the need for accommodating a cam shaft with a sufficient cam formation, making it impossible to insert the drawbar from the forward end and increasing manufacturing costs and complexity.
Innovation Solution
The cam shaft is designed with a recess dividing the cam formation into two separate formations, allowing reinforcing ridges on the drawbar, which reduces its overall cross-sectional dimension, enabling insertion from the forward end and providing structural strength through these ridges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the drawbar is made with a large cross-sectional dimension to accommodate a sufficient cam formation, then the cam shaft can provide the desired displacement and force reduction, but the drawbar cannot be inserted through the housing bore from the forward end and the overall dimensions of the clamping device increase
Solution Approach 1:
The cam formation is divided into two separate cam formations by introducing a recess in the cam shaft. This segmentation allows the drawbar to have a smaller cross-sectional dimension while still accommodating the necessary cam functionality through the distributed cam formations, enabling insertion through the housing bore from the forward end.
2Strength
If the drawbar is made with a large cross-sectional dimension to ensure sufficient tensile strength, then the drawbar can withstand the forces by which the tool holder shank is drawn into the shank bore, but the drawbar cannot be inserted from the forward end and manufacturing complexity increases
Solution Approach 1:
The drawbar is segmented with reinforcing ridges that divide the cross-section into multiple load-bearing regions. This segmentation allows the drawbar to maintain sufficient tensile strength with a smaller overall cross-sectional dimension, enabling forward end insertion while reducing assembly complexity.
Solution Approach 2:
The drawbar employs a composite structural design combining the drawbar body with reinforcing ridges formed as integral parts. This composite structure optimizes the strength-to-weight ratio, allowing the drawbar to withstand required forces while maintaining a compact size for forward insertion.
3Length of moving object
If the drawbar is made with a smaller cross-sectional dimension to enable insertion from the forward end, then the overall dimensions of the clamping device are reduced, but the tensile strength may be insufficient to withstand the clamping forces
Solution Approach 1:
The drawbar features local quality enhancement through reinforcing ridges that concentrate material and structural strength in specific critical regions. This allows the overall cross-sectional dimension to be reduced for easier insertion while maintaining sufficient tensile strength locally where the forces are most critical.
Solution Approach 2:
The drawbar utilizes a composite structural approach with reinforcing ridges integrated into the drawbar body. This creates a structure that optimizes material distribution, providing enhanced tensile strength in the reduced cross-sectional design without requiring a larger overall dimension.
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 allows for a smaller drawbar cross-sectional dimension, enabling insertion from the forward end, reducing manufacturing costs, and maintaining structural integrity for tool holding and releasing functions.
Implementation Method 1
a cam shaft extending through the drawbar aperture and comprising a cam formation, wherein the cam shaft is rotatably journalled in the housing and adapted to impart an axial displacement to the drawbar in relation to the housing by the cam formation when rotating the cam shaft
Data Source
AI summary
A clamping device for releasably holding a tool holder shank is formed with an engagement bore in a rear end. The clamping device includes a housing having a mounting bore for receiving the tool holder shank; a drawbar being mounted reciprocally movable inside the housing and which in a forward end is provided with an engagement segment which is arranged to engage with an engagement formation inside the engagement bore of the tool holder shank, wherein the drawbar is in a rear portion formed with a drawbar aperture extending through the drawbar, and a cam shaft extending through the drawbar aperture and comprising a cam formation. The cam shaft is rotatably journalled in the housing and arranged to impart an axial displacement to the drawbar in relation to the housing by the cam formation when rotating the cam shaft. The cam shaft includes two identical cam formations, which are spaced apart by a recess, and the drawbar is on the inside of the aperture formed with a ridge on each side of the aperture which each fits in the recess of the cam shaft when rotating the same.