Vehicle Mirror Gear Rotational Center Positioning
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Solution Overview
Problem
Conventional vehicle outside mirror devices face issues with the rotational center of gears not being positioned at a normal rotational center, leading to dispersion in distance between gear components, which affects smooth rotational force transmission and causes load and actuation noise.
Innovation Solution
The vehicle outside mirror device incorporates a shaft holder, shaft, casing, motor, and bearing member with engagement portions and press-in fixing protrusions that absorb manufacturing tolerances, ensuring the rotational center of gears is precisely positioned at the normal rotational center, eliminating dispersion and backlash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional gear mounting methods are used, then manufacturing is simpler, but the rotational center of gears cannot be precisely positioned, causing dispersion and backlash
Solution Approach 1:
The invention changes the physical state of the press-in fixing protrusions from rigid to elastic during assembly. The protrusions are designed with elastic properties that allow them to deform under press-in force, enabling precise positioning of the rotational center while absorbing manufacturing tolerances. This parameter change (from rigid to elastic) resolves the contradiction by achieving high precision without requiring complex adjustment mechanisms.
Solution Approach 2:
The elastic press-in fixing protrusions serve as a pre-designed cushioning element that absorbs manufacturing dispersion and tolerance variations before final assembly. By incorporating this elastic cushioning feature in advance, the patent eliminates the need for post-assembly adjustments and ensures precise rotational center positioning directly during the pressing process, thereby resolving the precision-complexity contradiction.
2Reliability
If precise rotational center positioning is achieved, then gear transmission is smooth, but manufacturing complexity increases
Solution Approach 1:
The invention utilizes the elastic parameter of the press-in fixing protrusions to achieve precise rotational center positioning during a simple press-fit operation. The elastic deformation of the protrusions during pressing automatically compensates for tolerance variations, ensuring smooth gear transmission without requiring complex assembly procedures or specialized manufacturing processes.
Solution Approach 2:
The elastic press-in fixing protrusions perform self-adjustment during assembly, automatically positioning the rotational center precisely through their elastic deformation. This self-service mechanism eliminates the need for external adjustment tools or complex assembly steps, thereby maintaining ease of manufacture while achieving high reliability in rotational force transmission.
3Manufacturing precision
If elastic press-in fixing protrusions are used, then manufacturing tolerances are absorbed, but component complexity increases
Solution Approach 1:
The invention incorporates elastic properties into the press-in fixing protrusions, changing their mechanical parameter from rigid to flexible. This single parameter change enables the protrusions to absorb manufacturing tolerances through elastic deformation during pressing, achieving precise rotational center positioning without adding complex multi-component structures.
Solution Approach 2:
The invention merges the functions of fixation and precision positioning into a single integrated component - the elastic press-in fixing protrusion. By combining these functions that would traditionally require separate components (fixation elements plus adjustment mechanisms), the patent achieves tolerance absorption and precise positioning while minimizing overall component complexity.
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
This solution enables smooth rotational force transmission between gears, reduces load on components, and minimizes actuation noise, while maintaining a minimal number of parts and manufacturing costs.
Implementation Method 1
a press-in fixing protrusive portion for casing bearing member which is elastically deformed and then is fixed to be pressed into the engagement portion of a counterpart
Data Source
AI summary
The present invention has: a first worm gear 29 that is rotatably borne on a gear case 11 and a bearing member 16, the first worm gear being coupled to an output shaft 24 of a motor 13; and a helical gear that is geared with the first worn gear 29. In the gear case 11 and the first worm gear 16, an engagement recessed portion 42 and an engagement protrusive portion 43 configured to engage with each other are provided. At the engagement protrusive portion 43 of the bearing member 16, a first press-in fixing protrusive portion 44 configured to be pressed-in and fixed to an engagement recessed portion 42 of the gear case 11 is provided. As a result, according to the present invention, a rotational center O1 of the first worm gear 29 is positioned at the normal rotational center.