Damping Element in Compressor Connecting Rods
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Solution Overview
Problem
Reciprocating-piston machines, particularly two-stage or multi-stage piston compressors, generate significant operating noise due to structure-borne sound transmission through the connecting-rod drive, which is challenging to mitigate with existing bearing technologies, leading to increased noise levels in vehicles.
Innovation Solution
Incorporating a damping element with elastic damping action in a damping annular chamber between the coupling bearing element and the connecting-rod eye, creating a ball-jointed configuration that generates a form fit, allowing for rotational movement between connecting rods and reducing lateral distortion and noise emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bearing technologies are used in the connecting-rod drive, then the drive remains reliable, but structure-borne sound transmission and operating noise increase significantly
Solution Approach 1:
A damping element is introduced as an intermediary component between the coupling bearing element and the connecting-rod eye. This damping element absorbs and dissipates vibration energy, reducing structure-borne sound transmission while allowing the connecting-rod drive to maintain its reliable mechanical function. The damping element acts as a mediator that decouples the harmful vibrations from the drive mechanism.
Solution Approach 2:
The patent changes the physical parameters of the bearing interface by introducing a damping element with specific viscoelastic properties. This modifies the mechanical characteristics of the connection between connecting rods, transforming the way vibrations are transmitted and reducing noise while preserving the drive's reliability under varying operating conditions.
2Ease of operation
If the damping element fills the damping annular chamber to create a ball-jointed configuration, then form fit and rotational movement are enabled, but manufacturing complexity increases
Solution Approach 1:
The damping element is designed with a spherical or spheroidal configuration that fits within the damping annular chamber. This spherical geometry enables ball-jointed movement between the connecting rods, providing rotational freedom while the curved surfaces facilitate smooth movement. The spheroidality allows the damping element to maintain contact with the connecting-rod eye inner surface during rotation.
Solution Approach 2:
The damping element is nested within the damping annular chamber, with the chamber forming a containment structure around the spherical damping element. This nested arrangement allows the damping element to move freely within the chamber boundaries while maintaining its damping function, and the chamber structure provides the necessary constraints for controlled rotational movement.
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 solution effectively reduces structure-borne sound emissions, improves acoustics, and ensures a reliable connecting-rod drive with reduced noise levels suitable for passenger motor vehicles, while also allowing for tolerance-free operation and compensation of temperature-induced variations.
Implementation Method 1
a damping element with elastic damping action arranged in a damping annular chamber between the coupling bearing element and the connecting-rod eye inner surface
Implementation Method 2
the damping element fills the damping annular chamber such that a ball jointed configuration which generates a form fit arises between the coupling bearing element and the connecting-rod eye inner surface
Data Source
AI summary
A reciprocating-piston machine, in particular a two-stage or multi-stage piston compressor, includes: a first connecting rod for deflecting a first piston and which has a connecting-rod eye, the first connecting rod being a drive connecting rod; a second connecting rod for deflecting a second piston and which has at least one further connecting-rod eye, the second connecting rod being a follower connecting rod; a coupling element which extends through the connecting-rod eye and the at least one further connecting-rod eye and about which the first connecting rod and the second connecting rod are rotationally movable relative to one another; a coupling bearing element arranged between the coupling element and a connecting-rod eye inner surface of the connecting-rod eye; and a damping element with elastic damping action arranged in a damping annular chamber between the coupling bearing element and the connecting-rod eye inner surface of the connecting-rod eye.