Motorcycle Headlamp Layout for Compact Size and Beam Distribution
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Solution Overview
Problem
Existing saddle-riding vehicle headlamps are not effectively downsized while maintaining required light distribution characteristics.
Innovation Solution
A headlamp unit incorporating a projector type low beam lamp and a reflector type high beam lamp, both using LED light sources, with a lamp housing design that tapers towards the front, allowing for compact sizing and efficient light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional headlamp design is used, then light distribution characteristics can be maintained, but the headlamp size cannot be effectively downsized
Solution Approach 1:
The headlamp unit is divided into separate projector type lamp and reflector type lamp modules, each housing distinct LED light sources. This segmentation allows independent optimization of each lamp type's optical path and housing geometry, enabling compact overall design while maintaining required light distribution patterns for both low and high beams
Solution Approach 2:
The lamp housing employs a tapered cross-sectional shape that varies along the front-back direction, utilizing three-dimensional spatial optimization. This dimensional approach allows efficient packing of optical components and achieves downsizing by strategically shaping the housing volume rather than simply reducing dimensions uniformly
2Object-affected harmful factors
If the headlamp unit is downsized, then vehicle aerodynamics improve, but maintaining required light distribution becomes difficult
Solution Approach 1:
The headlamp housing features a dynamic tapered profile where the cross-sectional shape changes along the front-back direction. This dynamic geometry optimizes both aerodynamic flow characteristics by reducing drag and provides sufficient internal volume distribution to accommodate the optical systems needed for proper light patterns
Solution Approach 2:
The projector type lamp and reflector type lamp are nested within the tapered lamp housing structure, with each lamp type containing its own sub-components (LED sources, reflectors, lenses). This nested arrangement maximizes space utilization within the compact housing, achieving downsizing without compromising light distribution functionality
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 enables the downsizing of the headlamp unit while ensuring necessary light distribution characteristics for both low and high beam functions, reducing air resistance and enhancing design flexibility.
Implementation Method 1
a projector type lamp housed in the lamp housing and including a first LED light source
Implementation Method 2
projector type lamp
Implementation Method 3
a reflector type lamp housed in the lamp housing and including a second LED light source
Implementation Method 4
reflector type lamp
Data Source
AI summary
A saddle-riding vehicle includes a saddle-riding vehicle body and a headlamp unit supported by the vehicle body. The headlamp unit includes: a lamp housing with a cross-sectional shape perpendicular to a front-back direction getting smaller toward a front side; a projector type lamp housed in the lamp housing and including a first LED light source; and a reflector type lamp housed in the lamp housing and including a second LED light source. The projector type lamp is a low beam lamp, and the reflector type lamp is a high beam lamp.