Vehicle Headlamp Rotary Shield Noise Reduction
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Solution Overview
Problem
Bi-functional headlamps for vehicles experience noise and impact issues due to the rotation of the rotary shield between high and low beam modes, primarily caused by the collision with a damper when the shield returns to its closed position.
Innovation Solution
A bi-functional headlamp design that incorporates a shock absorber maintaining contact with a position restricting cam to reduce the impact and noise of the rotary shield's rotation, utilizing a cam contact portion that moves in a linear trajectory and is elastically supported by a spring, along with a return spring to manage the rotary shield's movement between closed and open positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a return spring is used to rotate the rotary shield to a closed position, then the shield can return automatically without power consumption, but the shield collides with a damper and produces noise
Solution Approach 1:
The patent introduces a shock absorber that maintains continuous contact with the rotary shield during its rotation. This shock absorber acts as a cushioning element that absorbs the impact energy when the shield reaches the closed position, preventing the collision noise with the damper while maintaining the energy-efficient return spring mechanism
2Speed
If the rotary shield rotates quickly between positions, then the beam mode switching is fast and responsive, but impact and noise are generated
Solution Approach 1:
The shock absorber is positioned to engage with the rotary shield before impact occurs, providing continuous cushioning throughout the rotation movement. This allows the shield to rotate at higher speeds for fast beam switching while the shock absorber continuously dampens vibrations and prevents impact noise
3Object-generated harmful factors
If a damper is used to reduce noise, then operational noise is reduced, but the shield still experiences impact during rotation
Solution Approach 1:
The shock absorber serves as an intermediary element between the rotary shield and the damper system. It maintains continuous contact with the rotating shield, absorbing impact forces throughout the rotation and transferring them smoothly to the damper, thereby reducing both impact and noise simultaneously
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 significantly reduces the operational noise and impact associated with the rotation of the rotary shield, ensuring smooth transitions between high and low beam modes by maintaining contact between the position restricting cam and the cam contact portion, thereby minimizing disturbance.
Implementation Method 1
A shock absorber that maintains a contact state with the position restricting cam and reduces impact caused by the rotation of the rotary shield
Implementation Method 2
a return spring disposed on the rotating shaft of the rotary shield and configured to generate an elastic restoring force while being deformed when the rotary shield is opened
Data Source
AI summary
A bi-functional headlamp for a vehicle is provided. The bi-functional headlamp implements a high beam mode and a low beam mode by adjusting a movement of a shield of a headlamp. The bi-functional headlamp reduces the occurrence of impact and noise caused by an operation of opening and closing the rotary shield by maintaining contact between a shock absorber component that reduces operational noise of the rotary shield and one side of the rotary shield.