Motorcycle Headlamp Optical Unit Tilt Mechanism
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Solution Overview
Problem
Single-track vehicle headlamps, such as those on motorcycles, fail to provide optimal illumination when cornering due to the inclination of the vehicle, leading to reduced visibility and potential blinding of oncoming traffic, as the existing solutions require rotating the entire headlamp, which is cumbersome and inefficient.
Innovation Solution
An illumination device with an adjusting mechanism featuring a linear drive and a gear wheel system that allows the optical unit to tilt around a pivot axis, maintaining a stable light distribution by converting linear motion into angular motion, thus adapting the light beam to the vehicle's roll angle without rotating the entire headlamp.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire headlamp is rotated to compensate for vehicle inclination, then the light distribution remains optimal, but the device complexity and structural space requirements increase significantly
Solution Approach 1:
The headlamp assembly is segmented into two independent rotational components: the optical unit that can rotate about the first axis (longitudinal axis) to compensate for vehicle inclination, and the main headlamp body that remains relatively fixed. This segmentation allows only the necessary component (optical unit) to move, reducing overall system complexity while maintaining light distribution optimality
Solution Approach 2:
The optical unit is made dynamically adjustable through the adjusting mechanism that enables rotation about the first axis. This dynamic capability allows the optical unit to adapt its orientation in response to vehicle inclination during cornering, ensuring optimal light distribution without requiring the entire headlamp to be movable
2Reliability
If the entire headlamp is swung to adapt to vehicle inclination, then visibility is maintained, but the moving mass increases and movement becomes slow
Solution Approach 1:
By segmenting the headlamp system and isolating the optical unit as a separate rotatable component, the moving mass is significantly reduced compared to moving the entire headlamp. This lighter mass enables faster response speed when adapting to vehicle inclination changes during cornering maneuvers
Solution Approach 2:
The optical unit's independent rotational capability about the first axis provides rapid dynamic adjustment to match vehicle inclination angles, ensuring the light distribution pattern remains optimized for visibility without the lag associated with moving larger masses
3Reliability
If the optical unit is rotated about the first axis to adapt to vehicle roll angle, then the light distribution remains stable and horizontal, but additional adjusting mechanisms are required
Solution Approach 1:
The optical unit is equipped with a specific rotational degree of freedom about the first axis (longitudinal axis) that enables it to dynamically track vehicle roll angle changes. This targeted dynamic adjustment maintains the horizontal orientation of the light distribution pattern relative to the road, ensuring stability during cornering
Solution Approach 2:
The adjusting mechanism is designed with localized functionality, providing rotation about the first axis specifically at the optical unit where it is most needed for light distribution stability. This localized adjustment approach avoids the complexity of comprehensive multi-axis adjustment systems while achieving the critical function of maintaining horizontal light patterns
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 ensures consistent and safe illumination by maintaining a horizontal light distribution during vehicle inclination, enhancing visibility and reducing the risk of blinding oncoming traffic, while being more space-efficient and less cumbersome than rotating the entire headlamp.
Implementation Method 1
a gear wheel element, which is inserted in an opening area of the holder and rotatable about the first axis, said gear wheel element is attached to the first ring of the pivot bearing... the toothed rack is configured to engage with the gear wheel in order to convert a linear motion of the toothed rack into an angular motion of the gear wheel element and the optical unit about the first axis
Implementation Method 2
the pivot bearing comprises a first ring and a second ring, arranged concentrically and rotatable to each other about the first axis
Implementation Method 3
the optical unit comprises at least one heatsink configured to dissipate the heat of the at least one light source
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3C
AI summary
Illumination device (1) for vehicle headlamps, especially for single-track vehicle headlamps, comprising: - an optical unit (100), which is configured to form a light distribution with a cut-off line, and - an adjusting mechanism (200) for rotating the optical unit (100) about a first axis (X) by means of a pivot bearing (300), wherein the pivot bearing (300) comprises a first ring (310) and a second ring (320), wherein the optical unit (100) is attached to the first ring (310), and wherein the adjusting mechanism (200) comprises a holder (210), attached to the second ring (320), a gear wheel element (220), which is inserted in an opening area of the holder (210), said gear wheel element (220) is attached to the first ring (310), and a linear drive (230) with a toothed rack (231), configured to generate a linear motion of the toothed rack (231) along a second axis (A), in order to convert a linear motion of the toothed rack (231) into an angular motion of the gear wheel element (220) and the optical unit (100) about the first axis (X).