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Control arrangements for regulating the speed of a hydrostatic energy consumer

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TLDR
In this paper, a control arrangement for regulating the speed of movement of a hydrostatic energy consumer is provided in which the ratio between pressure supplied and power on the output side is constant, in particular, a piston capable of sliding in a cylinder connected to a pressure main line.
Abstract
Control arrangement for regulating the speed of movement of a hydrostatic energy consumer is provided in which the ratio between pressure supplied and power on the output side is constant, in particular, a piston capable of sliding in a cylinder connected to a pressure main line, characterized in that an initial hydrostatic displacement machine is connected between the pressure main line and the consumer and is coupled with a second hydrostatic displacement machine on the shaft side, the second hydrostatic displacement machine is adjustable with respect to its displacement volume per revolution and is connected on the one hand to the pressure main line and on the other hand to a chamber carrying a lower pressure, where the adjusting element of this second displacement machine is connected with an r.p.m.-regulating device.

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Travel drive apparatus for hydraulic drive work vehicle and control method therefor

TL;DR: A travel drive apparatus for a hydraulic drive work vehicle and control method therefor, the apparatus including an accelerator for controlling an engine rotational speed; an operation unit for selecting vehicle forward travel, stop, and reverse travel; the travel changeover valve being adapted for receiving signals from the operation unit, switching the discharged oil supplied from the travel hydraulic pump to the hydraulic motor, and controlling vehicle forward, stop and reverse trips as mentioned in this paper.
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References
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Hydrostatic transmission for motor vehicle - has hydraulic motor to power auxiliary reversible pump for control cylinder

TL;DR: In this article, an auxiliary hydraulic pump of constant output, connected to a control cylinder, regulates the oil flow through the hydraulic motor and thus governs its transmission performance, and a prime mover normally operates the hydraulic pump which drives the hydraulic motors at the output end of the transmission.
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High-efficiency hydrostatic vehicular drive system

TL;DR: In this article, a drive system has an engine that operates a control pump and a hydraulic variable-displacement drive pump having a control element and connected to a hydraulic motor.
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Hydraulic drive arrangement

Appel Wilhelm
TL;DR: In this paper, a variable-output hydraulic pump is connected with a hydraulic motor, and each of them is also connected with the reservoir for hydraulic fluid, and a variable throttle is interposed so that the pressure varies as a function of the number of revolutions of the hydraulic motor.
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Control means for variable displacement pump

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Hydraulic hammer mounted on a movable boom

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