Tire Building Drum Segment Radius Adjustment
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Solution Overview
Problem
Existing tire building drums with variable radii suffer from inconsistencies in the circumferential surface due to dips and waving patterns when expanded, affecting the quality of tire components.
Innovation Solution
A tire building drum design with radially movable segments and cover plates, where each segment has a first support surface for tire components and a second support surface for cover plates, allowing the second surface to move from a recessed to an extended position, ensuring a consistent circumferential surface by adjusting its radius to match the expanded state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the drum is expanded to increase the circumferential radius, then the drum can accommodate larger tire components, but dips and waving patterns appear on the circumferential surface at the location where cover plates rest on adjacent segments
Solution Approach 1:
The patent makes the second support surface movable relative to the first support surface by providing a movable connection (such as a hinge or slider mechanism). This allows the second support surface to dynamically adjust its position from a recessed state to an extended state, compensating for the radius change during drum expansion and maintaining circumferential surface consistency.
Solution Approach 2:
The patent changes the radial position parameter of the second support surface relative to the first support surface. By adjusting this parameter (moving the second support surface radially outward to match the expanded radius), the system compensates for the drum expansion and eliminates the dips and waving patterns on the circumferential surface.
2Length of moving object
If segments are spaced apart during expansion, then the drum radius increases, but the underlying cover plate support surface is exposed and creates a dip or waving pattern
Solution Approach 1:
The movable connection allows the second support surface to dynamically follow the segment spacing changes. As segments move apart during expansion, the second support surface adjusts its position accordingly, maintaining a smooth circumferential surface profile without exposed support surfaces creating dips or waves.
3Ease of operation
If the second support surface is recessed to accommodate the cover plate in the contracted state, then the cover plate is properly supported, but a dip is created in the expanded state
Solution Approach 1:
The movable connection enables the second support surface to transition between recessed and extended positions. In the contracted state, it remains recessed to properly support the cover plate. During expansion, it moves to an extended position that compensates for the radius increase, maintaining circumferential surface roundness without creating dips.
Data Source
AI summary
A tire building drum has a drum shaft and a circumferential surface for receiving a tire component, wherein the circumferential surface is defined by segments which are radially movable between a contracted position in which the circumferential surface has a first radius and an expanded position in which the circumferential surface has a second, greater radius. The tire building drum includes cover plates, wherein each segment is provided with a first section having a first support surface for supporting the tire component and a second section with a second support surface for supporting the cover plate. Each second section is movable relative to its respective first section from a recessed position in which the second support surface is recessed with respect to first radius and an extended position in which the second support surface is raised towards the second radius.