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Hydraulic system

A hydraulic system and circuit technology, applied in the field of hydraulic systems with flow combination capabilities, can solve problems such as difficulties

Inactive Publication Date: 2014-08-20
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Controlling the actuator in this manner may be difficult and / or undesirable in some applications

Method used

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  • Hydraulic system
  • Hydraulic system

Examples

Experimental program
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Embodiment Construction

[0013] 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 .

[0014] The actuation system 12 may include linkage structures that act through fluid actuators to move the work tool 14 . Specifically, the actuation...

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PUM

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Abstract

A hydraulic system (56) includes a variable displacement first pump (66), a first linear actuator (34) fiuidly connected to the first pump (66) via a first closed- loop circuit (58), a variable displacement second pump (66), and second and third linear actuators (26) fiuidly connected to the second pump (66) in parallel via a second closed- loop circuit (59). The system (56) also includes a variable displacement third pump (66), a fourth linear actuator (32) fiuidly connected to the third pump (66) via a third closed-loop circuit (60), a variable displacement fourth pump (66), and a first rotary actuator (43) fiuidly connected to the fourth pump (66) via a fourth closed-loop circuit (61). The system (56) also includes a second rotary actuator (42L) fiuidly connected to the second pump (66) in parallel with the second and third linear actuators (26), and a third rotary actuator (42R) fiuidly connected to the third pump (66) in parallel with the fourth linear actuator (32).

Description

technical field [0001] The present invention relates generally to hydraulic systems, and more particularly to hydraulic systems having flow combining capabilities. Background technique [0002] Conventional hydraulic systems include pumps that draw low-pressure fluid from a tank, pressurize the fluid, and make 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 actuator or another actuator at low speeds, the restriction imposed on fluid flow is increased. While adequate for many applications, the use of fluid restriction to control actuator speed creates pressure losse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B13/02E02F9/22F15B13/06
CPCF15B2211/613E02F9/2217E02F9/2289E02F9/2242E02F9/2292F15B2211/27F15B2211/20546F15B2211/20576F15B2211/3111F15B7/006E02F9/2296F15B2211/7058F15B7/008F15B2211/327F15B11/17F15B2211/7053F15B2211/3144
Inventor M·L·克纽斯曼
Owner CATERPILLAR INC