Engineering

Types of Linkage Synthesis

Linkage synthesis is designing a linkage to meet a desired output.  Since most linkages are capable of complex motion, this has been a daunting task except for specific linkages with predictable motion.  In this article we will look at various types of linkage synthesis. Before getting to far, we need to define the term “precision …

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Slider Crank Inversions

The slider crank is a very common linkage that is found in a variety of machines.  The most recognizable version of the slider crank is found in an engine in the form of a crank shaft, connecting rod, piston, and cylinder.  This mechanism also comes in different forms called slider crank inversions. The slider crank …

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Hydraulic Pump Calculations

Hydraulic pumps are the heart of a hydraulic system.  In this article we’ll present the equations for hydraulic pump calculations and explore efficiencies. We’ll start with the equations in SI and US units. Pump Equations – SI Pump Equations – US Hydraulic Pump Efficiencies There are three types of efficiency associated with a hydraulic pump. …

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Hydraulic Motor Calculations

In this article we’ll dive into hydraulic motor calculations and the important topic of efficiency.  Many hydraulic calculators ignore efficiency altogether and merely calculate theoretical values with 100% efficiency.  Manufacturers typically don’t get too deep into efficiency either. First we’ll present the equations for various parameters of a hydraulic motor in both SI and US …

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Planetary Gear Train Analysis

The planetary gear train is an important, but complex mechanism.  When it comes to analyzing rotation directions and gear speeds, intuition is not enough.  We’ll look at the superposition method to determine speeds and rotation directions. For a planetary (a.k.a. epicyclic) gear train there are three possible inputs/outputs: two gears and the planetary gear carrier.  …

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