Compensating Chuck Movable Drive Unit Non-Round Workpiece Centering
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Solution Overview
Problem
Conventional four-jaw chucks for concentric clamping suffer from limited practical utility with non-round workpieces due to inadequate compensation and high complexity, leading to reduced reproduction accuracy and susceptibility to faults.
Innovation Solution
A compensating chuck with a drive unit featuring two pairs of drivable entrainment members that move synchronously or differentially to ensure uniform radial movement of main jaws, allowing for adjustable compensation range and high reproduction accuracy, even with non-symmetrical workpieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional four-jaw chucks with rigid concentric gripping jaws are used, then the structure is simple, but the compensation range for non-round workpieces is limited and reproduction accuracy is reduced
Solution Approach 1:
The patent applies the dynamics principle by making the drive unit movable within the housing instead of fixed. The drive unit can deflect relative to the housing along the clamping direction, enabling dynamic adaptation to non-round workpieces. This movable configuration allows the system to automatically compensate for geometric variations without requiring complex additional compensation mechanisms, thereby improving reproduction accuracy while maintaining relatively simple structure.
2Adaptability or versatility
If oscillating rods are used to couple adjacent jaws, then compensation function is achieved, but lever length elasticity causes drive force losses and system complexity increases
Solution Approach 1:
The patent extracts the compensation function from the jaw coupling mechanism and relocates it to the drive unit. Instead of using oscillating rods to couple adjacent jaws, the drive unit itself is made movable and capable of deflecting independently. This separation of functions eliminates the need for complex oscillating rod mechanisms while maintaining the compensation capability, thereby reducing component complexity and eliminating drive force losses associated with lever length elasticity.
3Adaptability or versatility
If conical sliding surfaces with force directional conversion are used, then compensation is achieved, but the structural height becomes unacceptably high
Solution Approach 1:
The patent applies dynamics by enabling the drive unit to move and deflect directly along the clamping direction without requiring force directional conversion through conical surfaces. The movable drive unit can adapt its position dynamically, achieving compensation while maintaining a compact structural height. This eliminates the need for tall conical sliding surfaces and their associated force conversion mechanisms.
4Ease of operation
If multiple entrainment members with different movement components are used, then synchronous and differential jaw movement is achieved, but the transmission mechanism becomes more complex
Solution Approach 1:
The patent applies the universality principle by designing the drive unit to perform multiple functions: it can move synchronously with the housing to enable simultaneous radial movement of all jaws, and it can also deflect independently to enable differential movement for compensation. This multi-functional drive unit eliminates the need for separate transmission mechanisms for synchronous and differential movements, thereby reducing overall transmission complexity while maintaining ease of operation.
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 solution provides reliable centering and a large compensation range, enhancing the dimensional accuracy of machined workpieces by uniformly distributing forces across the periphery, while maintaining a compact structural height and simplicity in design.
Implementation Method 1
The entrainment members are mounted movably, preferably slidingly, particularly preferably without play, in the housing
Data Source
AI summary
A compensating chuck for concentrically clamping workpieces. The chuck has a drive unit having two pairs of entrainment members, wherein the entrainment members are preferably slidingly mounted, are respectively movable in paired relationship, and are so coupled to a respective one of the main jaws that a relative movement of a respective pair causes a synchronous movement of adjacent main jaws and that both a relative movement relative to each other with respectively different movement components and also a synchronous movement of the adjacent entrainment members in the same direction respectively causes a relative movement of adjacent main jaws.