Sunroof Guide Block Fixation via Segmented Interlocking
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Solution Overview
Problem
Existing sunroof apparatuses lack a robust fixing structure for guide blocks, which are subjected to significant loads during panel movement, leading to instability.
Innovation Solution
A sunroof apparatus with a guide block design that includes a body portion with a rear limited portion and a front limited portion, a holding member that contacts or is proximate to the front limited portion, and fitting grooves and pieces that limit movement in multiple directions, ensuring rigid fixation by interposing the rear edge of the attachment hole between the body and rear limited portion and fitting the guide block into the attachment hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide block is rigidly fixed to the guide rail, then the stability and reliability of the sunroof apparatus is improved, but the device complexity and assembly difficulty increase
Solution Approach 1:
The fixation structure is segmented into multiple functional components: the guide block with body portion, rear limited portion, and front limited portion; the attachment hole with rear edge portion; the holding member with front limiting portion; and fitting grooves with fitted pieces. Each segment serves a specific directional constraint function, distributing the fixation task across multiple simple geometric elements rather than requiring a single complex fixing mechanism.
Solution Approach 2:
The guide block is nested within the attachment hole structure, with the body portion mounted in the circumferential edge portion of the attachment hole. The rear limited portion and front limited portion are nested within the vertical space defined by the attachment hole, creating a compact integrated fixation assembly that reduces overall structural complexity.
2Stability of the object's composition
If multiple limiting portions and fitting structures are added to limit movement in all directions, then the fixation rigidity is improved, but the manufacturing complexity and assembly time increase
Solution Approach 1:
Different portions of the guide block have locally optimized geometries for specific functions: the body portion has a circumferential edge for mounting in the attachment hole; the rear limited portion has a specific shape to interpose with the rear edge portion of the attachment hole; the front limited portion has a geometry designed to contact or be proximate to the front limiting portion of the holding member. This local optimization allows each feature to achieve its constraint function with minimal material and geometric complexity.
Solution Approach 2:
The geometric features of the guide block (body portion, rear limited portion, front limited portion) and the attachment hole (rear edge portion) are designed to self-align and self-constrain during assembly. The interposition of the rear edge portion between the body portion and rear limited portion, and the contact between the front limiting portion and front limited portion, occur automatically through geometric interference fit without requiring additional adjustment or complex fastening operations.
3Reliability
If the guide block is tightly fixed with multiple constraints, then the movement limitation in forward and rearward directions is improved, but the ease of attachment and detachment deteriorates
Solution Approach 1:
The fixation system transitions between two dynamic states: during normal operation, the geometric features (rear edge portion interposed between body portion and rear limited portion, front limiting portion contacting front limited portion) provide rigid constraints that limit movement in forward and rearward directions; during attachment/detachment operations, the holding member can be loosened to release the front limiting portion constraint, allowing the guide block to be easily installed or removed. This dynamic behavior allows the same structure to provide both strong fixation and easy serviceability.
Solution Approach 2:
The guide block is designed with pre-formed geometric features (body portion, rear limited portion, front limited portion) that are prepared in advance during manufacturing. These features are configured to automatically engage with corresponding features of the attachment hole and holding member during assembly, eliminating the need for complex field adjustments or additional fastening steps during installation.
Data Source
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AI summary
A sunroof apparatus (11) includes: a movable panel (12) adapted to open and close an opening (10a) formed in a roof (10); a guide rail (13) provided in each edge portion of the opening in a width direction, extending in a forward and rearward direction, and including a front end portion in which an attachment hole (16) is formed to open in a vertical direction; a guide block (30) capable of limiting the movement of the movable panel in the forward and rearward direction, and including a body portion (31) mounted in a circumferential edge portion of the attachment hole, a rear limited portion (32) protruding downward from a rear end portion of the body portion, and a front limited portion (35) protruding downward from a front end portion of the body portion; and a holding member (40) tightened to the guide rail, and including a front limiting portion (43).