Composite Off-Road Door Hinge and Seal Design for Water and Swing Control
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Solution Overview
Problem
Off-road vehicle doors face issues with water penetration through gaps, complex and bulky attachment mechanisms, limited window geometry, and safety risks due to free-swinging doors.
Innovation Solution
A structural composite door design featuring a hinge assembly with shearable stop screws, a divider bar for improved visibility, and a door seal with wipers to prevent water infiltration, along with a secure bolt attachment system using bushings and longer bolts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rod-based door check systems are used to prevent free-swinging doors, then door safety is improved, but device complexity and bulk increase
Solution Approach 1:
The patent removes the separate rod-based door check system and integrates door positioning functionality directly into the hinge assembly. The hinge assembly includes a hinge body with a door check mechanism built-in, eliminating the need for external rod-based checks and reducing overall system complexity while maintaining safety functionality.
Solution Approach 2:
The patent combines the door check functionality with the hinge assembly into a single integrated unit. The hinge assembly encompasses both the hinge mechanism for door attachment and the door check mechanism for positioning, merging two previously separate systems into one compact component that reduces complexity and bulk.
2Ease of manufacture
If movable window panels are used exclusively, then manufacturing is simplified, but window geometry flexibility and visibility are limited
Solution Approach 1:
The patent divides the window system into distinct segments: a fixed window panel and a movable window panel. The fixed panel provides structural stability and geometric flexibility, while the movable panel maintains ease of manufacture. This segmentation allows for varied window geometries and improved visibility without complicating the manufacturing process.
3Ease of manufacture
If molded-on or adhered door seals are used, then manufacturing is simpler, but attachment strength is reduced
Solution Approach 1:
The patent incorporates seal receiving features directly into the molding of the door panel. These features are pre-formed during the door panel manufacturing process, creating prepared receptacles for the door seals before assembly. This preliminary action allows for strong mechanical attachment while maintaining manufacturing efficiency.
4Ease of manufacture
If standard hinge attachment is used, then manufacturing is simpler, but attachment security is reduced
Solution Approach 1:
The patent employs a composite construction approach where the door panel incorporates integrated hinge mounting features formed as part of the door structure. The hinge assembly attaches to these pre-formed composite features, creating a stronger unified attachment that distributes loads more effectively than standard separate-component mounting.
Data Source
AI summary
A structural composite door for an off-road vehicle includes multiple composite panels such as sheet molding compound (SMC) panels. The panels can define a column proximal to a rearward edge of the door. A door hinge can be connected to the door through screws extending through bushings extending through the column. The door hinge can include shearable stop screws configured to contact a stopping flange when the door is fully opened. A door check can be provided in a space defined by an arm of the door hinge. The door can include a fixed window and a movable window, separated by a divider bar composed of two pieces joined to one another. The door can include a door seal including an upper segment including wipers defining a water gutter between a roll-over protection beam and the door at an upper portion of the door where the door is closed.