Dash Panel and Brake Master Cylinder Assembly Vibration Control
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Solution Overview
Problem
The heavy brake master cylinder unit in electric vehicles, equipped with an electric motor, causes significant vibration in the dash panel, leading to discomfort for passengers, and existing solutions that reduce vibration compromise the rigidity needed for stable brake pedal pressing force.
Innovation Solution
The assembly includes a panel-side support plate, a unit-side support plate, and three anti-vibration plates with varying rigidity, where the second anti-vibration plate has greater rigidity to securely transfer pressing force and absorb high-frequency vibrations from the electric motor, ensuring both vibration suppression and rigidity against the brake pedal force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If anti-vibration plates with low rigidity are used to suppress vibration of the heavy cylinder unit, then vibration suppression is improved, but the rigidity against pressing force on the brake pedal deteriorates
Solution Approach 1:
The support structure is segmented into three separate anti-vibration plates (first, second, and third) positioned at different locations between the cylinder unit and dash panel. Each plate handles specific vibration frequencies and force transmission paths, allowing the system to simultaneously achieve vibration suppression and maintain rigidity under brake pedal pressing forces.
Solution Approach 2:
Different regions of the support structure have different rigidity characteristics. The first anti-vibration plate has lower rigidity for absorbing high-frequency vibrations from the electric motor, while the second and third plates provide greater rigidity for withstanding the pressing force from the brake pedal. This local differentiation of mechanical properties resolves the contradiction between vibration suppression and force resistance.
2Object-affected harmful factors
If the cylinder unit is supported by the dash panel through anti-vibration plates, then vibration of the dash panel is reduced, but the cylinder unit may move when the brake pedal is pressed
Solution Approach 1:
The support structure is divided into three anti-vibration plates positioned at different locations: the first plate between the dash panel and unit-side support plate, the second plate between the unit-side support plate and panel-side support plate, and the third plate between the panel-side support plate and cylinder unit. This segmentation allows each plate to contribute to both vibration isolation and positional stability through their combined rigidity characteristics.
Solution Approach 2:
The support structure uses a composite arrangement of multiple anti-vibration plates with different rigidity properties. The first plate uses material with lower rigidity for vibration absorption, while the second and third plates use materials with higher rigidity for force transmission and position stabilization, creating a composite system that achieves both vibration suppression and stability.
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 configuration effectively suppresses vibrations and maintains the necessary rigidity, preventing the brake master cylinder unit from moving during brake pedal pressing, thus enhancing the braking experience by stabilizing the pressing force and reducing discomfort.
Implementation Method 1
a first anti-vibration plate interposed between the dash panel and the unit-side support plate; a second anti-vibration plate interposed between the unit-side support plate and the panel-side support plate; and a third anti-vibration plate interposed between the panel-side support plate and the brake master cylinder unit
Implementation Method 2
a rigidity of the second anti-vibration plate in a plate thickness direction is greater than any of rigidities of the first and the third anti-vibration plates in plate thickness directions
Data Source
AI summary
An assembly of a dash panel and a brake master cylinder unit of a vehicle disclosed herein may include: a panel-side support plate arranged between the brake master cylinder unit and the dash panel, the panel-side support plate being parallelly fixed to the dash panel; a unit-side support plate arranged between the dash panel and the panel-side support plate, the unit-side support plate being fixed to the brake master cylinder unit; a first anti-vibration plate interposed between the dash panel and the unit-side support plate; a second anti-vibration plate interposed between the unit-side support plate and the panel-side support plate; and a third anti-vibration plate interposed between the panel-side support plate and the brake master cylinder unit. A rigidity of the second anti-vibration plate in a plate thickness direction may be greater than any of rigidities of the first and the third anti-vibration plates in plate thickness directions.