Vehicle Mirror Case Rattling Suppression via Localized Shaft Contact
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle visual recognition devices face challenges in suppressing rattling and increasing sliding resistance between the rotating member and the support shaft, which affects the stability and functionality of the device.
Innovation Solution
A vehicle visual recognition device with a support shaft and a rotating member featuring protrusion portions on the through hole that contact the support shaft, reducing the gap and contact surface area, and a restriction portion to restrict rotation, thereby minimizing rattling and sliding resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the drive case is rotatably supported on the support shaft with the support shaft penetrating through the drive case, then the device structure is simplified and rotation is enabled, but rattling occurs and sliding resistance increases
Solution Approach 1:
The invention applies local quality by adding protrusion portions only at specific locations on the drive case where contact with the support shaft is needed. These protrusion portions create localized contact points that suppress rattling without requiring the entire peripheral face to contact the shaft, thus maintaining simplicity while improving reliability.
Solution Approach 2:
The invention segments the contact interface between the drive case and support shaft by introducing protrusion portions that divide the continuous contact surface into discrete contact points. This segmentation reduces the overall contact area, thereby reducing sliding resistance while still providing sufficient contact to prevent rattling.
2Stability of the object's composition
If the peripheral face of the through hole contacts the support shaft to suppress rattling, then stability is improved, but sliding resistance increases
Solution Approach 1:
Instead of having the entire peripheral face contact the support shaft, the invention uses protrusion portions to create localized contact areas. This local quality approach provides sufficient stability to suppress rattling while minimizing the total contact area, thereby reducing sliding resistance.
Solution Approach 2:
The invention applies partial action by using only the necessary minimum contact area (through protrusion portions) to achieve rattling suppression, rather than having the entire peripheral face contact the shaft. This partial contact is sufficient for stability while reducing unwanted friction.
3Stability of the object's composition
If a large contact area is provided between the drive case and support shaft to suppress rattling, then stability is improved, but the driving force required increases
Solution Approach 1:
The invention uses protrusion portions to create localized contact points that provide sufficient support rigidity to suppress rattling. By concentrating contact at specific points rather than distributing it over a large area, the invention maintains necessary stability while minimizing the driving force required to overcome friction.
Solution Approach 2:
The contact interface is segmented into discrete protrusion portions, which reduces the total contact area compared to a continuous large contact surface. This segmentation maintains adequate support rigidity through strategic contact points while reducing the overall friction and required driving force.
Data Source
AI summary
In a vehicle door mirror device, a through hole of a case is penetrated by a support shaft so as to rotatably support the case on the support shaft. Lower ribs are formed in a protruding state at a peripheral face of the through hole, and protrusion leading end faces of the lower ribs are capable of contacting the support shaft. A gap dimension between the peripheral face of the through hole and the support shaft can accordingly be made small, thereby enabling rattling of the case with respect to the support shaft to be suppressed. Moreover, the contact surface area between the peripheral face of the through hole and the support shaft can be made small, thereby enabling an increase in sliding resistance between the peripheral face of the through hole and the support shaft to be suppressed.