Vehicle Roof Guide Rail Backlash Control
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Solution Overview
Problem
Existing roof apparatuses, such as those described in JP2005-162063A, have complex configurations that lead to insufficient control of backlash in the vertical direction due to slight clearances between guide components, which can result in reduced reliability and increased wear on weather strips during operation.
Innovation Solution
A roof apparatus with a guide rail and drive shoe system that includes a functional bracket with a front link member and a lifting mechanism, featuring guide and engagement portions that closely guide the components in the vertical direction, reducing backlash and wear by controlling the displacement of the functional bracket and movable panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a guide pin and engagement pin system is used to control the functional bracket, then the tilt-up mode is enabled, but backlash in the vertical direction is insufficiently controlled due to clearances between components
Solution Approach 1:
The patent changes the geometric parameters of the guide components by providing guide surfaces on the guide rail that extend in the front-rear direction and are spaced apart in the vertical direction. This creates a geometric constraint that limits vertical displacement of the functional bracket, transforming the clearance problem into a controlled geometric relationship between the guide pin and guide surfaces.
Solution Approach 2:
The patent introduces a guide block as an intermediary component between the guide rail and the functional bracket. The guide block receives the guide pin and provides the guide surfaces that constrain vertical movement. This intermediary structure mediates the interaction between the drive shoe and functional bracket, reducing the direct impact of clearances on backlash control.
2Stability of the object's composition
If the functional bracket is restricted at two points (guide pin and engagement pin), then rotational movement is controlled, but backlash is not sufficiently controlled due to short distance between restriction points
Solution Approach 1:
The patent adds a vertical dimension constraint by spacing the guide surfaces apart in the vertical direction. Instead of relying solely on front-rear positioning of restriction points, the vertical spacing of guide surfaces creates an additional degree of freedom control, effectively using the vertical dimension to limit vertical backlash while maintaining rotational freedom.
3Reliability
If a complex configuration with multiple guide components is used, then movement control is improved, but device complexity increases
Solution Approach 1:
The patent merges the guide function and the positioning function into a single integrated guide block structure. The guide block simultaneously provides the guide surfaces for vertical constraint and houses the engagement groove for front-rear positioning. This consolidation reduces the number of separate components while maintaining effective movement control.
Data Source
AI summary
A roof apparatus includes a guide rail extending in a front-rear direction of a vehicle, a drive shoe, a functional bracket, a front link member relatively rotatably connected at a front portion of the functional bracket and including a connecting portion, an engagement portion and a supporting portion, and a lifting mechanism connected at a rear portion of the functional bracket, wherein the guide rail includes a first guide portion guiding the supporting portion in response to an opening and closing operation of a movable panel and being closely located upwardly and downwardly of the supporting portion while the movable panel is in a fully-closed state, and the drive shoe includes a second guide portion guiding the engagement portion in response to the opening and closing operation of the movable panel and being closely located upwardly and downwardly of the engagement portion during the fully-closed state of the movable panel.