Rotatable Mirror Display Device Vibration Damping
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Solution Overview
Problem
Head-up display devices in motor vehicles often experience noise issues due to vibrations from the engine being transmitted to the display device, caused by manufacturing and assembly tolerances leading to play in the guide between components.
Innovation Solution
A display device with a mirror device that includes a semi-transparent display element and a drive device, featuring a bearing element that rotates relative to a counter-bearing element when in use, and a spring element to compensate for component tolerances, allowing for rotational and translational movement to adjust the display element to the driver's eye position while damping vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the display device uses multiple movable components to enable movement between stowed and use positions, then the display element can be positioned outside the housing for use, but manufacturing and assembly tolerances cause play in the guide between components leading to rattling noises
Solution Approach 1:
The patent extracts the display element from the housing during use, allowing it to be positioned outside the housing for optimal viewing. The bearing element enables this extraction while maintaining stable positioning, separating the display element's positioning function from the housing structure to eliminate noise transmission paths.
Solution Approach 2:
The spring element dynamically adjusts the bearing element's position to compensate for manufacturing and assembly tolerances. By applying elastic force, the spring element eliminates play in the guide between components, maintaining consistent contact and preventing rattling noises while preserving the full range of motion.
2Reliability
If the display element is moved between stowed and use positions using a guide mechanism, then positioning is enabled, but vibrations from the engine are transmitted to the display device through the guide
Solution Approach 1:
The bearing element acts as an intermediary between the display element and the housing. It provides a controlled interface that enables positioning while isolating the display element from vibration transmission. The spring element further mediates by absorbing vibrational energy and maintaining stable contact without rigidly coupling the components.
Solution Approach 2:
The spring element changes the mechanical properties of the connection between display element and housing by introducing elasticity. This allows the system to absorb vibrations while maintaining positioning stability, transforming rigid vibration transmission paths into compliant, vibration-dampening connections.
3Ease of manufacture
If tolerances in manufacture and assembly are present, then manufacturing is easier and cost-effective, but play in the guide between components causes noise
Solution Approach 1:
The spring element compensates for dimensional variations and play in the guide by providing continuous elastic force. It dynamically adjusts to accommodate manufacturing tolerances in the bearing element, guide rails, and mounting structures, eliminating noise without requiring tight manufacturing tolerances or complex precision assemblies.
Solution Approach 2:
The spring element provides beforehand cushioning by pre-loading the bearing element against the guide. This anticipatory elastic support compensates for potential play and misalignment before they can cause rattling noises, ensuring smooth operation despite manufacturing variations.
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 reduces rattling noises by eliminating play in the mechanism and damping vibrations, ensuring a reliable and quiet operation of the head-up display device in both stowed and use positions.
Implementation Method 1
the bearing element (19) is rotatably mounted relative to a counter-bearing element (20) which is assigned to the housing (12) in a stationary manner when the mirror device (13) is in the position of use
Implementation Method 2
a spring element (21) is provided, by means of which the bearing element (19) can be prestressed relative to the counter-bearing element (20)
Implementation Method 3
The solution effectively reduces rattling noises by eliminating play in the mechanism and damping vibrations
Data Source
Figure 1
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AI summary
The invention relates to a display device (2) for a motor vehicle (1), comprising a housing (12), a mirror assembly (13) which has a display element (7) with a semi-transparent mirror surface, and a drive device (15) by means of which the mirror assembly (13) is movable between a stowed position in which the display element (7) is arranged inside the housing (12) and an operating position in which the display element (7) is arranged at least partially outside the housing (12), wherein the mirror assembly (13) has a bearing element (19) and the housing (12) has a counter bearing element (20) corresponding to the bearing element (19), wherein the bearing element (19) is rotatably mounted relative to the counter bearing element (20) in the operating position of the mirror assembly (13).