Vehicle Speaker Shield Layout for Heat and Back Pressure Control
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Solution Overview
Problem
Vehicle speaker systems face reliability issues due to exposure to heat and foreign matter from the engine room, which affects acoustic performance and increases the risk of noise leakage into the cabin.
Innovation Solution
A vehicle speaker system with a shield member positioned between the speaker and the engine room to protect it from heat and foreign matter, featuring an open space design to remove back pressure and prevent obstacle interference, using a conductive shield member that can be grounded to reduce electromagnetic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the bass-sound auxiliary speaker is mounted with its back surface exposed in the engine room, then noise insulation performance is improved and rich bass sound is obtained, but reliability is reduced due to heat and wind pressure from vehicle running
Solution Approach 1:
The partition is divided into a first partition and a second partition, creating separate functional zones. The first partition handles acoustic requirements while the second partition provides environmental protection, segmenting the protective function from the acoustic function.
Solution Approach 2:
A shield member is introduced as an intermediary component between the speaker and the engine room environment. This shield member blocks heat and wind pressure while including through-holes that allow acoustic pressure relief, mediating between protective and acoustic requirements.
2Reliability
If a small enclosure is disposed behind the speaker for protection, then the speaker is protected from heat and wind pressure, but back pressure is insufficiently removed which adversely affects acoustic characteristics
Solution Approach 1:
The shield member has different properties in different locations: it is solid to block heat and wind pressure, but includes through-holes in specific locations to allow acoustic pressure relief. This local differentiation of properties resolves the contradiction between protection and acoustic performance.
Solution Approach 2:
The through-holes in the shield member act as intermediaries that selectively allow acoustic pressure to pass through while blocking environmental factors, mediating between the protective enclosure and acoustic requirements.
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 system effectively prevents heat and wind pressure from impacting the speaker, maintains acoustic characteristics, and enhances operational stability by shielding the speaker from engine room obstacles, ensuring reliable performance.
Implementation Method 1
a shield member that shields the speaker from obstacles in the engine-room inner space
Implementation Method 2
using a conductive shield member that can be grounded to reduce electromagnetic noise
Implementation Method 3
a plurality of apertures to allow sound pressure from a speaker to be released to an engine compartment
Implementation Method 4
An elastically deformable thermal conductive sheet is sandwiched between the partition wall and the end surface of the magnetic circuit
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A vehicle speaker system includes a speaker having a diaphragm that generates a sound pressure, a frame that supports the diaphragm vibratably, and a driving unit attached to the frame to drive the diaphragm. A position of the speaker relative to a partition separating a vehicle-cabin inner space and an engine-room inner space is determined so that the sound pressure generated by an action of the diaphragm passes through an opening in the partition. A shield member is provided with at least a part thereof being located between the speaker and an obstacle generation source located in the engine-room inner space to obstruct an operation of the speaker. An open part allowing a first space provided between the speaker and the shield member to communicate with the engine-room inner space is provided in such a direction as not to be directed toward the obstacle generation source.