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Closed-loop hydraulic system with priority-based sharing

A hydraulic system, closed-loop technology, applied in fluid pressure actuators, servo motor components, buildings, etc., can solve problems such as excessive loss

Active Publication Date: 2016-11-30
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] While all improvements over existing meterless hydraulic systems, the meterless hydraulic systems of the aforementioned '785 publication are still not optimal
In particular, since the third pump is connected in open loop to the first and second circuits, excess losses are still realized

Method used

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  • Closed-loop hydraulic system with priority-based sharing
  • Closed-loop hydraulic system with priority-based sharing
  • Closed-loop hydraulic system with priority-based sharing

Examples

Experimental program
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Embodiment Construction

[0012] figure 1 An exemplary machine 10 is shown having various systems and components that cooperate to accomplish tasks. Machine 10 may embody a stationary or mobile machine performing some type of operation associated with an industry such as mining, construction, agriculture, transportation, or other industries known in the art. For example, machine 10 may be, for example, an excavator ( figure 1 shown), bulldozers, loaders, backhoes, motor graders, dump trucks, etc., or any other earth-moving machine. Machine 10 may include implement system 12 configured to move work implement 14, drive system 16 for propelling machine 10, power source 18 for providing power to implement system 12 and drive system 16, and positioned to manually control implement system 12, drive Operator station 20 of system 16 and / or power source 18 .

[0013] Actuation system 12 may include linkage structures that act through linear and rotary fluid actuators to move work tool 14 . For example, the ...

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PUM

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Abstract

A hydraulic system (72) having first, second and third pumps is disclosed. The hydraulic system may also have a first actuator (26) connected in a closed loop to the first pump, a second actuator (32) and a third actuator (34) connected in a closed loop to the second pump . The hydraulic system may further have a selector valve (122) associated with the third pump and a first changeover valve (121) associated with the third pump and the third actuator. The first switching valve is capable of connecting the third pump to the third actuator in a closed-loop manner in a first position to move the third actuator in the first direction, the third pump being connected to the third actuator in a closed-loop manner between a second position for moving the third actuator in a second direction and a third position for connecting the third pump to the selector valve.

Description

technical field [0001] The present invention relates generally to a hydraulic system, and more particularly to a closed loop hydraulic system with priority based sharing between circuits. Background technique [0002] A traditional open loop hydraulic system includes a pump that draws low pressure fluid from a tank, pressurizes the fluid, and makes the pressurized fluid available to a number of different actuators for use in moving the actuators. In such an arrangement, the speed of each actuator can be independently controlled by selectively throttling (ie, restricting) the flow of pressurized fluid from the pump to each actuator. For example, in order to move a particular actuator at high speed, the flow of fluid from the pump to that actuator is restricted only a small amount. Conversely, to move the same actuator or another actuator at a low speed, the restriction imposed on the fluid flow is increased. While adequate for many applications, the use of fluid restriction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B13/02E02F9/22F15B15/18
Inventor B·A·埃德勒J·L·库恩J·T·彼得森M·T·维奎伦
Owner CATERPILLAR INC