Monthly Archives for April 2010

Hydrostatic Transmissions Advantages

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 … Continue reading

29. April 2010 by Jack
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Hydrostatic and Mechanical Drives Comparison

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 … Continue reading

29. April 2010 by Jack
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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) … Continue reading

28. April 2010 by Jack
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Automatic Transmission Shift Control

Performance of a direct-drive transmission with six shifts (six gears) is compared to a torque converter/automatic transmission with three shifts in Fig. 6.9. Note that the torque converter “broadens” the power transfer bands with the three shifts such that the … Continue reading

28. April 2010 by Jack
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Mechanical Transmissions

A vehicle with rear-wheel drive has the components shown in Fig. 6.1. For purposes of discussion, we assume that the mechanical transmission has four gear meshes. (Functionally, a mechanical transmission can be thought of as a black box with gears … Continue reading

28. April 2010 by Jack
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