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Category: Hydrostatic Transmissions

Hydrostatic Transmissions

Hydrostatic Drive for Sweet Sorghum Harvester

Posted on May 5, 2010

An experimental vehicle to harvest whole-stalk sweet sorghum was designed by a university research team. At present, the harvester is a pull-type machine, meaning it…

Hydrostatic Transmissions

Closed-Circuit Closed-Loop Hydrostatic Transmission

Posted on May 5, 2010November 7, 2012

The hydrostatic transmission, shown in Fig. 6.28, is operating under a constant load. Speed is set by the command voltage at 1000 rpm. The feedback…

Hydrostatic Transmissions

Servo Pump Operated with Flapper Nozzle Torque Motor

Posted on May 5, 2010November 7, 2012

The servo pump shown in Fig. 6.27 is like that shown in Fig. 6.26, except a torque motor is used to position the spool of…

Hydrostatic Transmissions

Manually Operated Servo Pump

Posted on May 5, 2010November 7, 2012

Before beginning our discussion of closed-loop hydrostatic transmissions, it is necessary to first learn how a servo-controlled pump operates. A variable displacement axial piston pump…

Hydrostatic Transmissions

Four-Wheel Drive Vehicle Hydrostatic Transmission

Posted on May 5, 2010November 7, 2012

A configuration where all four wheels are powered is shown in Fig. 6.18. A single pump provides flow to four motors. This machine can be…

Hydrostatic Transmissions

Three-Wheel Vehicle Hydrostatic Drive

Posted on May 5, 2010November 7, 2012

The vehicle shown in Fig. 6.17 has three wheel motors supplied by the same pump. In the design of such a vehicle, care must be…

Hydrostatic Transmissions

Vehicle with Two Hydrostatic Transmissions

Posted on May 5, 2010November 7, 2012

The vehicle shown in Fig. 6.14 has a separate in-line hydrostatic transmission for each drive wheel. The engine delivers power via a universal joint driveline…

Hydrostatic Transmissions

Hydrostatic Transmission with Variable Speed Motors

Posted on May 5, 2010

As previously mentioned, it is often necessary to provide a road speed, so the machine can be moved on the highway between job sites. (Generally,…

Hydrostatic Transmissions

Two Wheel Motors Hydrostatic Transmission

Posted on May 5, 2010November 7, 2012

Wheel motors, mounted at both rear wheels (Fig. 6.12), is a variation of the configuration shown in Fig. 6.11. This arrangement eliminates the universal joint…

Hydrostatic Transmissions

Hydrostatic Transmissions Advantages

Posted on April 29, 2010

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…

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