Vehicle Mirror Folding Cam Mechanism Anti-Jitter
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Solution Overview
Problem
The existing electric folding devices for outer rearview mirrors suffer from poor anti-shudder capability, wind noise, and high operational current, leading to folding failures due to inadequate support and increased friction between the mirror substrate and support, especially during fast driving or on rough roads.
Innovation Solution
An electric folding device with a cam assembly that lifts the foundation bed and shell during folding, utilizing a spring and pin shaft to reduce rotation resistance, and a positioning mechanism to ensure accurate assembly, along with a compact design incorporating a large gear and convex blocks for improved coaxiality and mounting accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a gap is reserved between the mirror substrate and the mirror support to reduce frictional resistance during folding, then the folding smoothness is improved, but the anti-shudder capability deteriorates and wind noise increases
Solution Approach 1:
The patent applies a spring mechanism that dynamically adjusts the gap between the mirror substrate and mirror support. During normal driving, the spring maintains a small gap for smooth folding. During folding operation, the spring compresses to reduce the gap further, minimizing wind noise and improving folding smoothness without compromising anti-shudder capability
Solution Approach 2:
The patent changes the gap parameter dynamically using a spring mechanism. The gap varies between a small value during normal operation (maintaining anti-shudder capability) and a larger value during folding (reducing frictional resistance). This parameter change resolves the contradiction by optimizing the gap for different operational states
2Device complexity
If the mirror substrate is solely supported by a pin shaft with a spring sleeve to reduce structure complexity, then the device complexity is reduced, but the anti-shudder capability deteriorates
Solution Approach 1:
The patent merges the support function with the folding mechanism by integrating the spring mechanism into the pin shaft assembly. The spring sleeve is mounted on the pin shaft to provide both folding motion and anti-shudder support simultaneously, reducing device complexity while maintaining reliability
Solution Approach 2:
The pin shaft assembly serves multiple functions: it enables folding rotation, provides anti-shudder support through the spring mechanism, and maintains the gap between components. This multi-functionality reduces the need for separate support structures, lowering device complexity while ensuring anti-shudder capability
3Ease of manufacture
If plastic material is used for injection-molded mirror substrate and mirror support to reduce manufacturing cost, then the ease of manufacture is improved, but the operational reliability deteriorates due to aging and friction
Solution Approach 1:
The patent introduces a spring mechanism as an intermediary element between the plastic mirror substrate and mirror support. This spring component compensates for dimensional changes due to aging and reduces friction during operation, thereby improving operational reliability without affecting the ease of manufacturing the plastic components
Solution Approach 2:
The spring mechanism provides beforehand cushioning by pre-compressing to compensate for future aging effects and friction. This anticipatory cushioning ensures that the plastic components maintain proper clearance and operational reliability over time, despite their inherent tendency to age and increase friction
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 provides a smoother folding process with reduced shaking and wind noise, improved support for the mirror substrate, and lower operational current, resulting in fewer folding failures and enhanced anti-jitter performance.
Implementation Method 1
a spring arranged on the pin shaft in a sleeving mode, and a connecting piece which makes the shell manually rotate relatively to the base, the connecting piece is pressed on the foundation bed by the pre-tightening force of the spring
Implementation Method 2
a cam assembly is provided among the connecting piece, the foundation bed and the base, during the electric folding process, driven by the electric driving unit, the cam assembly enables the foundation bed to lift up and rotate along the pin shaft through the relative slide of the cam assembly
Implementation Method 3
an electric driving unit used for driving the shell to rotate relatively to the base around the axis of the pin shaft
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present disclosure discloses an electric folding device for outer rearview mirror of a vehicle, which includes a shell (6), a foundation bed (3), a base (2), a pin shaft (7), an electric driving unit used for driving the shell (6) to rotate relatively to the base (2) around the axis of the pin shaft (7), a spring (5) arranged on the pin shaft (7) in a sleeving mode, and a connecting piece (4) which makes the shell (6) manually rotate relatively to the foundation bed (3). A cam assembly is provided among the connecting piece (4), the foundation bed (3) and the base (2). During the electric folding process, driven by the electric driving unit, the cam assembly enables the foundation bed (3) to lift up and rotate along the pin shaft (7) through the relative slide of the cam assembly and the elastic force of the spring (5). The device is compact in structure, with better anti-jitter performance, smooth electric folding process, and less folding failure.