Hub Chuck Fixture for Accurate X-Ray Detection
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Solution Overview
Problem
In the automobile hub production process, the lower rim of spun hubs often has uneven burrs, leading to deflection and inaccurate X-ray detection due to excessive runout, which can result in device damage and reduced work efficiency.
Innovation Solution
A hub chuck with a three-layer structure comprising a clamping center shaft, a top cover plate, and a tapered bottom plate, where the lower rim of the hub is caught in a ring groove and clamped by tapered teeth on the step gear, avoiding irregular burrs and ensuring accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the hub blank is clamped by the existing fixture at the lower rim, then the clamping structure is simple, but the uneven burrs cause excessive runout leading to deflection and inaccurate detection
Solution Approach 1:
The fixture is divided into multiple functional components: a support component with support points for the lower rim, a clamping component with clamping points for the upper part, and a positioning component. This segmentation allows each component to perform its specific function independently, improving detection accuracy while maintaining reasonable structural complexity
Solution Approach 2:
The patent introduces an intermediary positioning component that mediates between the support component and the clamping component. This intermediary ensures accurate positioning of the hub blank by providing reference surfaces that compensate for the uneven burrs, thereby improving measurement precision without significantly increasing overall device complexity
2Reliability
If the hub blank is clamped at the lower rim with burrs, then the clamping operation is simple, but excessive vibration causes the hub to be thrown out and damages devices
Solution Approach 1:
The fixture separates support function and clamping function into different components located at different positions. The support component handles the lower rim while the clamping component handles the upper part, reducing vibration and improving reliability without making the operation overly complex
Solution Approach 2:
The patent moves the clamping points from the lower rim (one dimension) to the upper part of the inner wheel lip (another dimension). This dimensional change allows the hub blank to be supported at one location while clamped at another, reducing vibration and preventing the hub from being thrown out during detection
3Manufacturing precision
If the hub blank is clamped by the existing fixture, then the setup is simple, but excessive runout causes deflection and detection failure
Solution Approach 1:
The positioning component performs preliminary positioning of the hub blank before clamping occurs. By establishing accurate positional references in advance using the support points and positioning surfaces, the hub blank is pre-aligned to minimize runout, ensuring manufacturing precision is achieved before the clamping action takes place
Solution Approach 2:
The patent applies local quality by creating specific high-precision surfaces and features at critical locations: support points on the support component and corresponding positioning surfaces on the hub blank. These localized high-precision features provide accurate positioning without requiring the entire fixture structure to be complex
Data Source
AI summary
A hub chuck, includes a clamping center shaft, a top cover plate, a middle step gear and a tapered bottom plate. In a three-layer structure of the cover plate, the step gear and the tapered bottom plate of the chuck, the maximum outer ring diameter of the cover plate is smaller than that of the step gear, the minimum outer ring diameter of the step gear is smaller than that of the tapered bottom plate, the lower part of the step gear and the upper surface of the tapered bottom plate form a ring groove, a lower rim of a hub can be caught in the ring groove, and tapered teeth at the upper part of the step gear can be pressed to an inner wheel lip.