Compressor Crank Alignment to Prevent Gear and Bearing Wear
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Solution Overview
Problem
Compressed-air compressors with one-sided crank systems experience bending moments due to non-coaxial alignment of the cylinder axis and central bearing, leading to increased wear in gears and bearings.
Innovation Solution
The cylinder axis is arranged to pass through both the centric and eccentric bearings of the crank, ensuring that forces acting on the crank are aligned with the cylinder axis, eliminating bending moments and wear on the gear and bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the cylinder axis is offset from the central bearing of the crankshaft (non-coaxial arrangement), then the connecting rod can be positioned along the cylinder axis for compact design, but bending moments act on the crankshaft causing increased wear and unfavorable gear coupling
Solution Approach 1:
The patent employs asymmetric positioning where the cylinder axis is deliberately offset from the crankshaft's central bearing axis, creating a specific geometric relationship between the cylinder, crankshaft, and connecting rod that enables compact packaging while managing force distribution through the eccentric bearing arrangement
Solution Approach 2:
The patent resolves the contradiction by introducing a third dimension - the eccentric bearing - which allows the connecting rod to connect to the crankshaft at a position that is both offset from the cylinder axis (enabling compact design) and properly aligned to minimize bending moments (maintaining reliability)
2Volume of moving object
If the cylinder axis does not run through the central bearing of the crankshaft, then space is saved in the compressor design, but bending moments cause faster wear of gears and bearings
Solution Approach 1:
The asymmetric offset arrangement positions the cylinder axis away from the central bearing axis, enabling more compact compressor unit volume while the specific geometric parameters are optimized to control the resulting bending moments and protect gear and bearing service life
Solution Approach 2:
The patent optimizes specific geometric parameters including the offset distance between the cylinder axis and central bearing axis, the position of the eccentric bearing, and the connecting rod dimensions to achieve the best compromise between compact volume and extended service life of mechanical components
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 prevents bending moments on the crank and associated components, reducing wear and improving the operational efficiency and longevity of the compressor.
Implementation Method 1
During the compression stroke, the gas exerts a force Fg on the piston. The force Fg is transmitted to the crank, in particular to the crank bearings. This causes a reaction force RFg to occur at the crank.
Data Source
AI summary
The invention relates to a tire sealing and/or tire inflating device (60) having a compressed-air compressor, and compressed-air compressor comprising a drive, in particular an electric motor (50), for driving a compressor device (20) of the compressor, wherein the compressor device (20) has a piston (26) guided in a cylinder (22) and a crank (30), wherein the crank (30) is coupled to a connecting rod (28) of the piston (26) via an eccentric bearing (38) and to the drive via a gear (48) and has a centric bearing (36), wherein a cylinder axis (34) passes through both the centric bearing (36) of the crank (30) and the eccentric bearing (38) of the crank (30) with the connecting rod (28), when a piston stroke of the piston (26) is at the bottom or top dead center.