Integrally Molded Instrument Cluster Panel with Tear Seams
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Solution Overview
Problem
The existing instrument cluster trim panels with separate upper and lower sections require additional manufacturing tooling, assembly steps, and increased system costs, leading to fit and finish issues due to the complexity of aligning multiple pieces, which can impede the collapse of the steering column during a crash.
Innovation Solution
An integrally molded plastic finish panel with a collar and bridge section that converge along tear seams, featuring mounting flanges for a rigid mount and a shroud section with risers and ribs to facilitate upward force transmission, allowing the panel to break away without hindering the steering column's collapse, while reducing the piece count and assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate upper and lower cluster finish panel sections are employed, then the steering column can collapse without obstruction, but the device complexity and assembly steps increase
Solution Approach 1:
The finish panel is segmented into a rigidly-fixed portion and a breakable portion that can separate during steering column collapse. The breakable portion includes tear seams that allow controlled separation, enabling the panel to move out of the way of the collapsing steering column while maintaining structural integrity during normal operation.
Solution Approach 2:
The invention merges the rigidly-fixed portion and breakable portion into a single integrally molded finish panel, eliminating the need for separate bridge sections and reducing assembly complexity. The panel is attached to the instrument panel in a rigidly-fixed manner overall, but contains internal breakable sections that can separate when needed.
2Reliability
If separate upper and lower cluster finish panel sections are employed, then the steering column can collapse without obstruction, but the manufacturing cost and tooling requirements increase
Solution Approach 1:
The invention combines multiple separate panels into a single integrally molded finish panel, reducing the number of manufacturing steps, tooling requirements, and assembly operations. The integral construction eliminates fit and finish issues between separate parts while maintaining the breakaway functionality through strategically placed tear seams.
3Reliability
If separate upper and lower cluster finish panel sections are employed, then the steering column can collapse without obstruction, but the fit and finish quality deteriorates
Solution Approach 1:
The invention merges separate panels into a single integrally molded component, eliminating the visible seams and alignment issues that occur when assembling multiple pieces. The integral construction ensures consistent fit and finish across the entire finish panel while incorporating breakable sections with tear seams that separate cleanly during collapse.
4Ease of manufacture
If a rigidly-fixed finish panel is used, then the manufacturing process is simplified, but the steering column collapse is impeded
Solution Approach 1:
The finish panel is segmented into rigidly-fixed and breakable portions, allowing the panel to remain securely attached during normal operation while enabling controlled separation during steering column collapse. The breakable portion includes tear seams that facilitate clean separation when the steering column moves forward during a crash.
Solution Approach 2:
The finish panel transitions from a static rigidly-fixed state during normal operation to a dynamic breakable state during collapse. The panel is designed with tear seams that allow it to change its structural characteristics based on the forces applied, remaining fixed under normal conditions but separating when subjected to crash forces.
Data Source
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AI summary
An instrument panel trim apparatus mounts in a vehicle to frame an instrument cluster above a collapsible steering column. An integrally molded plastic panel has an upper collar section, a lower bridge section, and a shroud section, wherein the upper collar section and lower bridge section are configured to form a frame around the instrument cluster. The upper collar section and lower bridge section converge along a pair of tear seams. The shroud section extends downward from the lower bridge section and has an arched shape to receive the steering column. A plurality of risers are disposed between the shroud section and the lower bridge section for concentrating stress at the tear seams when the shroud section is impinged by the steering column when collapsing, so that the tear seams separate and the lower bridge section and the shroud section can deflect upward.