Tire Building Drum Center Section Rigidity
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Solution Overview
Problem
Existing tire building drums face issues with the limited rigidity of their center sections, leading to bending and irregularities during tire construction due to contracting forces and inward radial forces, which affect the cylindrical main surface's uniformity.
Innovation Solution
A tire building drum design featuring a center section supported by expandable left and right sections with a blocking device that locks the support member against inward movement, enhancing the center section's rigidity by using a combination of blocking surfaces, blocking bodies, and biasing elements to maintain stability during expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the center section is made expandable to allow tire component placement, then the ease of operation is improved, but the rigidity and stability of the center section deteriorates causing bending and irregularities
Solution Approach 1:
The support member is designed to be movable in the radially outward direction, allowing it to dynamically adapt its position as the center section expands and contracts. This dynamic adjustment maintains stability throughout the expansion cycle rather than requiring a fixed rigid structure
Solution Approach 2:
The blocking device acts as an intermediary mechanism that mediates between the movable support member and the fixed blocking surface. It provides controlled restriction of inward movement while allowing outward movement, resolving the conflict between mobility and stability
2Ease of operation
If the support member is allowed to move freely with the center section during expansion, then the ease of operation is improved, but the manufacturing precision deteriorates due to potential inward movement causing irregularities
Solution Approach 1:
The support member is segmented into functional zones: a movable portion that travels with the center section during expansion, and a blocked portion that is restricted from inward movement by the blocking device. This segmentation allows simultaneous achievement of mobility and precision
Solution Approach 2:
The blocking device serves as an intermediary that selectively restricts movement in the radially inward direction while permitting outward movement. This directional control ensures manufacturing precision is maintained during the expansion and contraction cycle
Data Source
AI summary
Disclosed is a tire building drum and method for operating the tire building drum, which tire building drum include a left section, a right section, a center section, and a support member for supporting the center section in the radially outward direction. The support member is movable together with the center section in the radially outward direction. The tire building drum further includes a blocking device for blocking the support member against movement in a radially inward direction when the center section is in the expanded position.