Compressor Crank-Bearing Layout for Low-Vibration Air Feed
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Solution Overview
Problem
Compressor arrangements in pneumatic systems face challenges in achieving low-noise and low-vibration operation due to bending moments and unbalanced masses, which lead to dynamic loading conditions and increased noise and vibration.
Innovation Solution
The compressor arrangement features a drive bearing and connecting rod bearing that partially or completely overlap in the axial direction, with the axial center planes lying in the same bearing plane to minimize bending moments, and includes balancing weights on the connecting rod and crank disk to balance the mass system, placing the center of gravity on the axis of rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the axial distance between the axial center plane of the drive bearing and the axial center plane of the connecting rod bearing is reduced, then bending moments and vibrations are reduced, but the device complexity increases due to the overlapping bearing arrangement
Solution Approach 1:
The drive bearing and connecting rod bearing are merged in the axial direction by positioning their axial center planes in the same bearing plane or allowing them to overlap. This combination eliminates the axial distance between the bearings, thereby reducing the bending moment lever arm and minimizing vibrations generated during compressor operation.
Solution Approach 2:
The bearing arrangement transitions from a sequential axial positioning to a overlapping or co-planar configuration in the axial dimension. By changing the spatial relationship between bearings from separated to overlapping, the invention reduces the axial moment arm without compromising functional independence of each bearing.
2Object-generated harmful factors
If balancing weights are added to the connecting rod and crank disk, then the mass system is balanced and vibrations are reduced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Balancing weights are attached to the connecting rod and crank disk to counterbalance the unbalanced masses during rotation. These counterweights create opposing forces that cancel out the vibrations generated by the reciprocating and rotating components, achieving dynamic balance of the mass system.
Solution Approach 2:
The mass distribution parameters of the connecting rod and crank disk are modified by adding balancing weights. This changes the center of gravity position and mass moment of inertia, enabling the mass system to be balanced and reducing vibrations during operation.
3Ease of manufacture
If the drive bearing and connecting rod bearing are positioned one above the other with axial distance, then the device structure is simpler and easier to manufacture, but bending moments increase causing drive shaft deformation and noise
Solution Approach 1:
The drive bearing and connecting rod bearing are merged in the axial direction by positioning their axial center planes in the same bearing plane or allowing them to overlap. This combination eliminates the axial distance between the bearings, thereby reducing the bending moment lever arm and minimizing vibrations generated during compressor operation.
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3B
AI summary
The invention relates to a compressor assembly for a compressed-air feed of a compressed-air supply system. According to the invention, in the compressor assembly, a drive bearing and a connecting rod bearing overlap partly or completely in the axial direction or the axial center plane of the drive bearing and the axial center plane of the connecting rod bearing lie in a bearing plane and a crank disk is fixedly connected to an end section of the drive shaft and furthermore the crank disk is connected to the connecting rod in a rotationally movable manner by means of the connecting rod bearing at a connecting rod receiving section arranged eccentrically to the drive shaft.