Reciprocating Piston Compressor Elastomer Bearing Damping
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Solution Overview
Problem
Reciprocating-piston machines, particularly two-stage or multi-stage piston compressors, generate significant operating noises due to the transmission of body-borne sound through the crank drive, which is a challenge in achieving improved acoustics and reliable connecting-rod drives, especially in passenger motor vehicles.
Innovation Solution
The implementation of a reciprocating-piston machine design that includes elastomer elements for elastically dampened and resilient mounting of connecting-rod bearings, reducing noise transmission by absorbing and decoupling energy between connecting rods and bearing pins, and compensating for temperature-induced changes and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a reciprocating-piston machine with crank drive is used to compress air, then compression function is achieved, but significant operating noises are generated due to body-borne sound transmission through the crank drive
Solution Approach 1:
The patent introduces elastomer elements as intermediary components between the connecting rod and bearing pin. These elastomer elements serve as mediators that absorb and dampen body-borne sound vibrations, preventing noise transmission through the crank drive while maintaining the mechanical connection and reliability of the connecting-rod drive system.
Solution Approach 2:
The patent converts the harmful body-borne sound vibrations into beneficial elastic deformation of the elastomer elements. By allowing controlled elastic deformation, the system transforms the harmful vibrational energy into harmless elastic strain, thereby reducing noise while maintaining drive reliability.
2Object-generated harmful factors
If rigid mounting of connecting-rod bearings is used, then structural stability is maintained, but noise transmission and wear are increased
Solution Approach 1:
The patent changes the mechanical parameters of the mounting system by replacing rigid connections with elastomer-based flexible connections. This parameter change allows the system to maintain structural stability through elastic restoring forces while simultaneously reducing noise transmission and wear through vibration damping.
Solution Approach 2:
The patent employs composite material principles by combining metal components (connecting rod, bearing pin) with elastomer materials. This composite approach leverages the strength and stability of metals while utilizing the damping and noise-reduction properties of elastomers to achieve both structural stability and reduced harmful factors.
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 significantly reduces noise generation and extends the service life of compressor components by enhancing acoustic characteristics and reducing wear, while maintaining reliable operation under varying temperature conditions.
Implementation Method 1
elastomer element that serves for the elastic dampening and/or resilient mounting of the at least one second connecting-rod bearing
Implementation Method 2
elastomer element that serves for the elastic dampening and/or resilient mounting
Data Source
AI summary
A reciprocating-piston machine includes at least one first cylinder and at least one first piston assigned to the first cylinder as well as at least one second cylinder and at least one second piston assigned to the second cylinder. During operation, the first piston and the second piston are deflected in a respective cylinder displacement chamber of the respective first cylinder and the second cylinder. The reciprocating-piston machine further includes a crankshaft which, during operation, can be driven and which has an eccentric crankshaft journal and a drive shaft coupling designed for the coupling of a drive shaft of a drive motor for driving the crankshaft. Additionally, the reciprocating-piston machine includes a first connecting rod configured to deflect the first piston, a second connecting rod configured to deflect the second piston, and a bearing pin about which the first and second connecting rod are rotationally movable.