Sequenced Expansion Tire Building Drum
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Solution Overview
Problem
Conventional tire building drums face challenges in achieving accurate alignment and control of deck segments during expansion and contraction, leading to difficulties in maintaining lateral and radial run-out, which complicates the tire manufacturing process.
Innovation Solution
A tire building drum design featuring alternating sets of deck segments with interlocking mechanisms and a sequenced expansion system, where the segments of one set expand before the other, ensuring precise alignment and stability during both expansion and contraction, allowing for a large range of movement and minimizing radial loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional tire building drums use simultaneous expansion of all deck segments, then the structure is simpler, but alignment accuracy and lateral/radial run-out control deteriorate
Solution Approach 1:
The deck segments are divided into two distinct sets (first set and second set) that expand and contract in sequence rather than simultaneously. This segmentation allows independent control of each set's expansion timing, enabling precise alignment control while managing structural complexity through systematic organization.
Solution Approach 2:
The first set of deck segments expands to its fully expanded position before the second set begins expansion. This preliminary action ensures that the first set is properly positioned and aligned before the second set is introduced, minimizing clearance and maintaining alignment accuracy throughout the expansion process.
2Adaptability or versatility
If deck segments are expanded to large diameter, then tire size versatility improves, but lateral and radial run-out control worsens
Solution Approach 1:
The deck segments transition dynamically between collapsed and expanded positions through a controlled sequenced expansion system. This dynamic control allows the drum to adapt to different tire sizes while maintaining precision through active management of segment positioning during the expansion and contraction cycle.
Solution Approach 2:
The expansion and contraction of deck segments occurs in periodic cycles with distinct phases: first set expansion, second set expansion, combined operation, and sequential contraction. This periodic action pattern ensures consistent alignment and run-out control across varying tire sizes by repeating the precise expansion sequence for each tire production cycle.
3Manufacturing precision
If alternating sets of segments are used with interlocking mechanisms, then alignment precision improves, but device complexity increases
Solution Approach 1:
The second set of deck segments is positioned to enter and nest between the already-expanded segments of the first set. This nesting arrangement allows the alternating sets to interlock efficiently, achieving precise alignment while minimizing the complexity of interlocking mechanisms by utilizing the spatial arrangement of alternating segments.
Data Source
AI summary
A tire building drum is disclosed having first and second sets of deck segments, disposed in an alternating configuration about a central shaft. Each of the segments is mounted to a pair of axially movable hub units via an associated scissor linkage. The scissor linkages of the first segments are slidably mounted to the hub units and biased toward a median plane of the tire building drum. When the hub units are separated, the second segments are disposed radially inwardly of and between the first segments. Movement of the hub units toward one another through a first range of motion expands the first deck segments to an expanded diameter of the drum, and movement of the hub units toward one another through a second range of motion expands the second deck segments to allow the second deck segments to be received between the first deck segments.