Spindle Arrangement for Tyre Shaping Drum Force Symmetry
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Solution Overview
Problem
Existing tire shaping apparatuses face manufacturing complexity and uneven force distribution, leading to non-uniform tire mass distribution and increased wear on the shaping drum due to asymmetrical sliding forces and oblique bead core orientation.
Innovation Solution
A spindle arrangement with a central spindle and two synchronous side spindles, where core clamping devices are assigned to the central spindle and turn-over devices are assigned to the side spindles, allowing for symmetrical force introduction and reduced manufacturing complexity, with axially symmetrical loading and synchronized movement of spindle nuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a hollow spindle with coaxial mounting of spindles is used, then synchronous axial movement of core clamping devices and turn-over devices is achieved, but manufacturing outlay and apparatus complexity increase significantly
Solution Approach 1:
The spindle arrangement is segmented into a central spindle and two side spindles that are independently mounted on the shaping drum. Each spindle operates independently to drive its assigned devices (core clamping devices or turn-over devices), eliminating the need for a complex hollow spindle structure while maintaining synchronous movement through separate drive mechanisms.
2Device complexity
If a spindle pair with two parallel spindles is used, then manufacturing complexity is reduced, but sliding forces are introduced asymmetrically causing oblique bead core orientation and uneven tire mass distribution
Solution Approach 1:
The invention deliberately introduces asymmetry in the spatial arrangement of spindles (central spindle between two side spindles) while maintaining symmetry in the force application mechanism. The central spindle drives core clamping devices symmetrically positioned on opposite sides of the drum axis, ensuring that sliding forces are introduced symmetrically despite the asymmetric spindle configuration.
Solution Approach 2:
The central spindle acts as an intermediary element that mediates between the two side spindles and the core clamping devices. By positioning the central spindle between the side spindles and using it to drive the core clamping devices, the system achieves symmetrical force introduction while maintaining structural simplicity.
3Device complexity
If asymmetric force introduction is used, then apparatus simplicity is achieved, but reaction forces on the shaping drum increase causing increased wear and short service life
Solution Approach 1:
The symmetrical arrangement of the central spindle between two side spindles creates a counterbalancing effect. The forces generated by the spindles are distributed symmetrically, with the central spindle's forces counteracting the side spindles' forces, thereby reducing the net reaction forces on the shaping drum and minimizing wear.
Data Source
AI summary
A device is disclosed for turning up the side walls of tyres on a shaping drum for shaping a tyre carcase, the spindle arrangement of which has a central spindle and at least two side spindles running in parallel, between which the central spindle extends, wherein the central spindle and the side spindles are drivable in a mutually independent manner and the core clamping devices are allocated to the central spindle and the turn-over devices are allocated to the side spindles or the turn-over devices are allocated to the central spindle and the core clamping devices are allocated to the side spindles.