Vehicle Ceiling Speaker Mounting via Reinforcing Brace
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Solution Overview
Problem
Existing on-vehicle acoustic devices are limited in mounting speakers on ceiling parts with soft interior linings, as they require rigid structures for fixing, which restricts sound quality improvement and the installation of larger speakers like woofers.
Innovation Solution
An on-vehicle acoustic device design featuring a speaker mounted on a ceiling with a reinforcing material and a ceiling lining, where the speaker's central part is fixed to the reinforcing material through a smaller opening in the lining, using elastic interposing materials to secure the speaker without direct vibration transmission and utilizing the lining as a baffle to enhance sound pressure containment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a speaker is mounted on a ceiling part with soft interior lining using conventional fixing methods, then the mounting structure becomes complex and difficult to assemble, but the speaker cannot be firmly fixed
Solution Approach 1:
A fixing member is introduced as an intermediary component between the speaker and the ceiling lining. This fixing member includes a pressing part that contacts the speaker and a pressing force applying part that engages with the ceiling lining, mediating the connection between the rigid speaker and the soft ceiling material to achieve firm fixation without complex mounting procedures
Solution Approach 2:
The fixing member utilizes elastic deformation of the soft ceiling lining material as a fixing mechanism. By applying pressing force through the fixing member, the ceiling lining undergoes controlled elastic deformation to create friction and mechanical interlocking, transforming the soft material's property from a disadvantage to a fixation advantage
2Ease of manufacture
If the opening part in the ceiling lining has the same diameter as the speaker frame, then the speaker can be easily installed, but sound pressure leaks into the car cabin reducing sound quality
Solution Approach 1:
The ceiling lining acts as a flexible membrane that is pressed by the fixing member to create a tight seal around the speaker frame. The flexible nature of the ceiling lining material allows it to conform to the speaker frame and block sound pressure leakage, while the pressing force ensures continuous contact and sealing effectiveness
Solution Approach 2:
The softness of the ceiling lining, which initially prevents firm fixation, is converted into a beneficial sealing mechanism. The same soft material that cannot support rigid fixing methods is pressed to create elastic deformation and friction-based sealing, transforming its inability to provide rigid support into an advantage for sound isolation
3Volume of moving object
If a large diameter woofer is mounted on the rear tray or car door, then sufficient space is limited, but mounting on ceiling part requires overcoming the soft lining structure
Solution Approach 1:
The fixing member serves as a mediator that distributes the mounting load across a larger area of the ceiling lining. By spreading the pressing force through the pressing force applying part, the fixing member prevents localized stress concentration that would cause the soft lining to fail, enabling secure mounting of large diameter woofers
Solution Approach 2:
The fixing mechanism changes the stress distribution parameters in the ceiling lining by using a distributed pressing force rather than concentrated point loads. This parameter change allows the soft lining to support larger speakers by preventing structural failure while maintaining fixation reliability
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 design allows for firm speaker fixation on soft ceiling linings, improves sound quality by preventing sound pressure leakage, and accommodates larger speakers like woofers by securing sufficient space, while enabling easy assembly without disassembling the car body.
Implementation Method 1
utilizing the lining as a baffle to enhance sound pressure containment
Implementation Method 2
using elastic interposing materials to secure the speaker without direct vibration transmission
Implementation Method 3
utilizing the lining as a baffle to enhance sound pressure containment
Data Source
AI summary
An opening is formed in a ceiling lining of a vehicle cabin part. The diameter of the opening in the ceiling lining is smaller than a diameter of a speaker, which has a frame. The speaker is disposed at the opening, and a fixing screw is inserted into a fixing aperture formed in a central part of the speaker. A fixing screw is screwed to a screw hole formed in a reinforcing brace positioned at an inner side of a top plate proximate the ceiling of the vehicle. A central part of the speaker is fixed to the reinforcing brace while a circumferential periphery of the frame is pressed against a peripheral edge of the opening in the ceiling lining via a frame interposing material.