Winding Device Axial Displacement Restriction Mechanism
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Solution Overview
Problem
Existing winding devices in vehicles, such as sunshade and tonneau cover devices, face issues with axial displacement of the shade sheet leading to insufficient shading and abnormal noise due to vibration, which affects usability and operational stability.
Innovation Solution
A winding device with a shaft portion and a rotary shaft member, where a relative rotation restriction structure and a movement restriction structure are formed on the fitting portion between the shaft and the rotary shaft member, preventing relative rotation and axial movement, ensuring the shaft portion remains fixed in position and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the winding shaft is allowed to move in the axial direction with respect to the connecting shaft, then the winding device can accommodate axial displacement, but the shade sheet becomes displaced in the axial direction making the shading area insufficient and abnormal noise occurs due to traveling vibration
Solution Approach 1:
The invention divides the fitting portion into two independent functional structures: a relative rotation restriction structure (protrusion and groove) that prevents rotational displacement, and a movement restriction structure (protrusion and recess) that prevents axial movement. This segmentation allows each structure to perform its specific function without interfering with the other, resolving the contradiction between adaptability and reliability.
Solution Approach 2:
The protrusion and groove structures act as intermediaries between the winding shaft and connecting shaft, mediating the interaction by providing controlled restriction mechanisms. These intermediary structures enable the system to maintain stable shading area while still accommodating necessary axial displacements through the designed movement restriction mechanism.
2Adaptability or versatility
If the winding shaft is allowed to move in the axial direction with respect to the connecting shaft, then the winding device can accommodate axial displacement, but abnormal noise occurs due to traveling vibration
Solution Approach 1:
The invention segments the fitting portion into rotation restriction and movement restriction structures, where the movement restriction structure specifically addresses vibration-induced noise by preventing axial displacement that would cause harmful vibrations and abnormal noise during vehicle travel.
Solution Approach 2:
The invention converts the potential harm of axial displacement (which causes vibration and noise) into a controlled movement through the movement restriction structure. By designing the protrusion and recess to engage properly, the system allows necessary axial movement while converting harmful random vibrations into controlled, noise-free operation.
3Device complexity
If a simple fitting structure is used between the shaft portion and rotary shaft member, then the device complexity is reduced, but the shaft portion may move in the axial direction causing insufficient shading and noise
Solution Approach 1:
The invention merges two restriction functions (rotation restriction and axial movement restriction) into a single integrated fitting structure between the shaft portion and rotary shaft member. By combining these functions into one fitting portion with coordinated protrusion-groove and protrusion-recess structures, the design achieves reliable shaft position stability without increasing overall device complexity.
Solution Approach 2:
The fitting portion serves multiple functions simultaneously: it restricts relative rotation through the protrusion-groove structure, restricts axial movement through the protrusion-recess structure, and maintains the integrity of the winding mechanism. This multi-functionality eliminates the need for separate components, keeping the device simple while ensuring reliable shaft positioning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses axial displacement of the screen and abnormal noise caused by vehicle vibrations, enhancing usability and eliminating the need for additional noise-reducing materials, thereby improving the operational stability and cost-effectiveness of the winding device.
Implementation Method 1
a biasing portion that biases the rotary shaft member in a rotation direction for winding the screen
Data Source
AI summary
The present invention discloses a winding device that includes a screen, a shaft portion to which one end of the screen is fastened, a rotary shaft member that fits to an end portion of the shaft portion so that the rotary shaft member is rotated around a rotation axis along an axial direction of the shaft portion, and a biasing portion that biases the rotary shaft member in a rotation direction for winding the screen. A relative rotation restriction structure and a movement restriction structure are formed on a fitting portion between the shaft portion and the rotary shaft member. The relative rotation restriction structure restricts a relative rotation of the shaft portion with respect to the rotary shaft member. The movement restriction structure restricts a movement of the shaft portion in the axial direction with respect to the rotary shaft member.