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Independent metering valve assembly for multiple hydraulic load functions

a technology of hydraulic load and metering valve, which is applied in the direction of fluid couplings, servomotors, couplings, etc., can solve the problem that the continuous operation of the hydraulic fan motor may not be desirabl

Inactive Publication Date: 2005-08-04
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a hydraulic system with a pressure source and two independently controlled hydraulic loads. The system includes an independent metering valve assembly with multiple valves that can be controlled electronically. The valves are connected to the pressure source, and each load is connected to a separate outlet. The system can be controlled to independently control the flow of fluid from the pressure source to each load. The technical effect of this invention is the ability to independently control the flow of fluid in a hydraulic system, which can improve efficiency and performance.

Problems solved by technology

Driving a hydraulic fan motor in a continuous manner may thus not be desirable both from a parasitic power consumption stand point as well as operating efficiency of the engine.

Method used

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  • Independent metering valve assembly for multiple hydraulic load functions
  • Independent metering valve assembly for multiple hydraulic load functions

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Embodiment Construction

[0010] Referring now to FIG. 1, there is shown an embodiment of a hydraulic system 10 of the present invention utilized within a work machine, such as, for example, an excavator, front end loader, truck or tractor. For ease of illustration, only a portion of a frame 12 of the work machine is shown in FIG. 1. Frame 12 carries hydraulic system 10, which generally includes a pressure source 14, an IMV assembly 16, a first hydraulic load 18, a second hydraulic load 20, an adjustable valve 22 and a tank 24.

[0011] Pressure source 14 provides a source of pressurized hydraulic oil to hydraulic system 10. In the embodiment shown, pressure source 14 is in the form of a hydraulic pump.

[0012] IMV assembly 16 includes a plurality of independently and electronically controllable valves 26, 28, 30 and 32. More particularly, IMV assembly 16 includes a first controllable valve 26, a second controllable valve 28, a third controllable valve 30 and a fourth controllable valve 32. First controllable v...

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PUM

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Abstract

A hydraulic system, particularly suitable for use in a work machine, is provided with a hydraulic pressure source. A first hydraulic load is associated with a first load function. A second hydraulic load is associated with a second load function. An independent metering valve assembly includes a plurality of independently and electronically controllable valves. The independent metering valve assembly includes an inlet fluidly coupled with the pressure source, a first outlet fluidly coupled with the first hydraulic load, and a second outlet fluidly coupled with the second hydraulic load. The hydraulic system is configured such that the independent metering valve assembly may operate and drive multiple hydraulic load functions.

Description

TECHNICAL FIELD [0001] The present invention relates to hydraulic systems, and, more particularly, to hydraulic systems used in conjunction with an internal combustion engine including an independent metering valve assembly. BACKGROUND [0002] A work machine such as a tractor, excavator, front end loader or the like typically includes an internal combustion engine providing motive force to the vehicle as well as providing power for auxiliary components. Auxiliary components may include hydraulic cylinders, hydraulic brakes, hydraulic fan motors, or other fluid actuated devices. [0003] It is known to utilize an independent metering valve (IMV) assembly in association with an internal combustion engine. Such an independent metering valve assembly typically receives pressurized hydraulic fluid from a hydraulic pump and is in fluid communication with a single hydraulic load providing a single hydraulic function. For example, an IMV assembly may be fluidly coupled with a two-way hydraulic...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E02F9/22F01P7/04F15B11/16
CPCE02F9/2217E02F9/2267E02F9/2296F01P7/044F15B2211/7142F15B2211/20546F15B2211/212F15B2211/30575F15B2211/3059F15B11/162
Inventor REINERS, ERIC A.UFHEIL, STEVEN T.
Owner CATERPILLAR INC