Archive for April, 2010

Advantages of Hydrostatic Transmissions

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A hydrostatic transmission provides improved maneuverability, but at a cost. The efficiency of a hydrostatic transmission is always lower than a discrete-gear transmission. A discrete-gear transmission will typically have an efficiency of 95% or greater, meaning that 95% of the input energy is delivered to the load (wheels). A hydrostatic transmission has an efficiency of …

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Comparison of Hydrostatic and Mechanical Drives

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Comparison of Hydrostatic and Mechanical Drives

The same vehicle shown in Fig. 6.1 is shown in Fig. 6.11 with the mechanical transmission replaced with a hydrostatic transmission; all other components remain the same. To provide a specific example, we will begin by specifying a variable displacement axial piston pump and a fixed displacement axial piston motor. (Refer to Chapter 4 for …

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Introduction to Hydrostatic Transmissions

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Introduction to Hydrostatic Transmissions

A hydrostatic transmission (HST) is simply a pump and motor connected in a circuit. Other components are added to obtain certain operating features. The four basic configurations of hydrostatic transmissions are : 1. In-line (Fig. 6.10a) 2. U-shape (Fig. 6.10b) 3. S-shape (Fig. 6.10c) 4. Split (Fig. 6.10d) Various pump and motor designs can be …

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Torque Converters

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Torque Converters

A torque converter is a hydrodynamic drive component utilizing three (or more) annular bladed parts to absorb power from a prime mover and automatically adjust its operating output speed to match the load demand (Fig. 6.7). The torque converter input shaft is connected to an impeller, which imports momentum to the fluid filling the converter. …

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