Tire Mounting Machine Parallelogram Arm Structure
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Solution Overview
Problem
Existing tire mounting and demounting machines face issues with tool deformation and misalignment due to large cantilever lengths, leading to potential rim damage and alignment problems across varying rim diameters.
Innovation Solution
A machine with a mobile structure of four interconnected arms using exclusively rotary mechanical connections, maintaining constant lever arm length and tool orientation relative to the rim, ensuring correct alignment and reducing deformation risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a horizontal mobile arm mounted in rotation around a vertical column is used to position the tool, then the tool can be brought close to the rim edge, but the large cantilever causes strong deformations and potential rim contact
Solution Approach 1:
The mobile structure is divided into four separate arms (A, B, C, D) interconnected by pivots, rather than using a single long cantilever arm. This segmentation distributes the mechanical loads across multiple shorter segments, reducing deformations while maintaining tool positioning capability.
Solution Approach 2:
The mechanism transitions from a planar rotation around a vertical column to a three-dimensional parallelogram structure with pivots having parallel axes. This dimensional change allows the tool to reach the rim edge while maintaining a shorter effective cantilever length through spatial configuration.
2Ease of operation
If a horizontal mobile arm pivots around a vertical column, then the tool can reach the rim edge, but the azimuthal position varies with rim diameter
Solution Approach 1:
The parallelogram mobile structure provides universal positioning capability that works across different rim diameters. The geometric constraints of the parallelogram mechanism ensure that the tool maintains correct azimuthal alignment regardless of the rim size, making the mechanism adaptable to various wheel dimensions.
Solution Approach 2:
The mobile structure dynamically adapts its configuration through the four pivots with parallel axes, allowing the arms to rotate and adjust to different rim diameters while maintaining proper tool alignment. The mechanism's degrees of freedom enable it to accommodate varying dimensions without losing precision.
3Ease of operation
If a sliding mechanism is used for the horizontal arm, then the tool can be positioned radially, but play appears over time causing misalignment
Solution Approach 1:
The invention replaces the sliding mechanism with a rotary pivot connection. While rotary connections may have some play, they are more reliable over time compared to sliding mechanisms where play accumulates. The rotary pivots can be easily replaced or maintained, ensuring long-term alignment stability.
Solution Approach 2:
The sliding mechanical connection is replaced with a rotary pivot connection. This substitution changes the type of mechanical interaction from linear sliding to rotational movement, eliminating the wear and play issues inherent in sliding mechanisms while achieving the same radial positioning function.
4Measurement precision
If the horizontal arm slides perpendicular to the column, then azimuthal position remains constant, but the overhang remains large causing deformations
Solution Approach 1:
The long horizontal arm is segmented into four shorter arms forming a parallelogram. This segmentation reduces the overhang length from the vertical column while maintaining the tool's azimuthal alignment capability through the coordinated rotation of the four pivots.
Solution Approach 2:
The mechanism moves from a two-dimensional sliding arm to a three-dimensional parallelogram configuration. This spatial reconfiguration allows the tool to maintain constant azimuthal position relative to the rim while reducing the horizontal overhang distance, thereby improving rigidity.
Data Source
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AI summary
The machine has a table (11) for attaching a rim (2) and rotating the rim in a centered manner around a vertical axis (Y). A fitting and removal tool (12) fits and removes a tire (1). A movable structure (20) has four arms (A-D) connected together two by two by four pivots (p-s), respectively. The pivots are provided with pivot axes that are parallel with one another, respectively. One of the arms is secured to a frame (10), and the tool is connected to the other arm.