Two-Cylinder Electric Air Compressor Mounting Structure for Variable NVH
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Solution Overview
Problem
Two-cylinder electric air compressors in vehicles face challenges in meeting desired Noise, Vibration, and Harshness (NVH) levels due to fixed rubber mounts, particularly at variable speeds and pressures, and the size and weight of four-cylinder compressors are often excessive for applications requiring lesser capacity.
Innovation Solution
A mounting structure with adjustable rubber mounts and a V-shaped arrangement of cylinder heads, utilizing a first and second mount plate with rails, allowing slidable positions based on operational parameters like rotational speed, and incorporating a permanent magnet synchronous motor and independent cooling with electric fans to optimize NVH performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed rubber mounts are used in a two-cylinder electric air compressor, then the structure is simple and easy to manufacture, but the NVH (Noise, Vibration and Harshness) performance is insufficient at variable speeds and pressures
Solution Approach 1:
The patent applies the dynamics principle by making the rubber mount positions adjustable rather than fixed. The mounting structure includes rails that allow the rubber mounts to be repositioned along the rail length according to different operational conditions (speed and pressure requirements), transforming a static fixed-position system into a dynamic adjustable-position system that can adapt to varying NVH performance needs.
2Productivity
If a four-cylinder electric air compressor is used to provide sufficient compressed air, then the free air delivery and output capacity are high, but the size and weight become excessively large for applications requiring lesser capacity
Solution Approach 1:
The patent applies parameter changes by modifying the operational parameters of a two-cylinder compressor through adjustable rubber mount positions. By changing the mounting positions of the rubber mounts along the rails, the compressor's vibration characteristics and NVH performance are optimized to enable a compact two-cylinder design to achieve the productivity of a larger four-cylinder compressor without increasing weight or size.
3Weight of moving object
If a two-cylinder electric air compressor is used to reduce weight and size, then the capacity and free air delivery are reduced, but the NVH performance becomes insufficient with fixed rubber mounts
Solution Approach 1:
The patent makes the mounting structure dynamic by providing adjustable rubber mount positions along rails, allowing the compact two-cylinder compressor to achieve optimal NVH performance at different operating conditions, thereby maintaining reliability without sacrificing weight reduction benefits.
4Reliability
If adjustable rubber mount positions are implemented to optimize NVH performance, then the NVH level meets requirements at variable speed and pressure, but the device complexity and assembly difficulty increase
Solution Approach 1:
The patent implements adjustable rubber mount positions along rails with positioning holes, creating a dynamic mounting system that can be adapted to different NVH requirements while maintaining relatively simple assembly through standardized rail and mount components.
Solution Approach 2:
The mounting structure is segmented into modular components (rails with positioning holes and rubber mounts that can be positioned and fixed at different locations), allowing for simplified assembly and adjustment compared to a completely custom-designed flexible mounting system.
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 enhances NVH performance, reduces weight and size, simplifies assembly, and provides independent cooling, while maintaining efficient air delivery, thus optimizing the two-cylinder electric air compressor's operation.
Implementation Method 1
a pair of first mounts movably positioned in the first mount plate with rail. The pair of first mounts are configured to be slidable along the first mount plate with rail
Implementation Method 2
incorporating a permanent magnet synchronous motor and independent cooling with electric fans
Data Source
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AI summary
A mounting structure (9) for a two-cylinder electric air compressor (100) of a vehicle is disclosed. The mounting structure (9) includes a first mount plate with rail (91) extending longitudinally and fixedly connected to one side of a cylinder block (1) of the two-cylinder electric air compressor (100). The mounting structure (9) further includes a pair of first mounts (93) movably positioned in the first mount plate with rail (91). The pair of first mounts (93) are configured to be slidable along the first mount plate with rail (91). The mounting structure (9) further includes a second mount (94) connected to the cylinder block (1) on other side of the cylinder block (1) opposite to the side of mounting of the pair of first mounts (93).