Hydraulic dual circuit system

A dual-loop, loop technology, applied in servo meter circuits, fluid pressure actuation devices, earth movers/shovels, etc., can solve the problem of too large measurement orifice size, and achieve the effect of improving controllability

Inactive Publication Date: 2007-05-09
BOSCH REXROTH AG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the disadvantage of this solution is that in the LUDV system the proportional directional valve with measuring orifice and the pressure compensator downstream of the consumer respectively must be designed according to the volume flow, which is between two Combinations of circuits allow maximum delivery to the assigned consumers
That is to say, when the system operates in a dual circuit, the proportional directional valves arranged on the respective main shafts, especially the measuring orifice, are too large
[0006] A further disadvantage is the very early switchover to single-circuit systems in these known solutions, since the combined valve arrangement combines the circuits if the required pressure medium is greater than can be provided by the pump

Method used

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Embodiment Construction

[0028] FIG. 1 shows a schematic diagram of an excavator control, which is designed as a dual-circuit system with two hydraulic circuits 2 , 4 . Consumers 8 , 10 of excavators such as the travel gear of the undercarriage with two caterpillar tracks, for example, or excavators such as the slewing mechanism, bucket handle, bucket or boom, can be controlled via two circuits equipment. The pressure medium supply of the two circuits 2 , 4 each takes place via auxiliary hydraulic pumps 6 , 7 which are preferably controlled as a function of the maximum load pressure in the respective circuit.

[0029] If the control consumer 8 requires more pressure medium than the assigned auxiliary hydraulic pump 6 can provide, the consumer 8 is operated undersaturated. To avoid such undersaturation, there is a combined valve arrangement 12 by which a predeterminable quantity of pressure medium can be delivered from the auxiliary hydraulic pump 7 to the consumer 8 .

[0030] In such an excavator c...

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Abstract

A hydraulic dual-circuit system for controlling consumer loads of a mobile appliance, in which each hydraulic circuit (2,4) is provided with an adjustment pump (6,7) depending on the highest load pressure and via which the associated load can be supplied with pressure and in which the two circuits (2,4) are interconnected via a summation valve arrangement (12), which is used to feed the pressure from one of the connected circuits via a summation line (24) downstream from the orifice plate (14) and from the pressure maintaining valve (16) of the summed consumer load.

Description

technical field [0001] The invention relates to a hydraulic double circuit system for controlling consumers of a mobile device, in particular a crawler device according to the preamble of claims 1 and 13 . Background technique [0002] US 6,170,261 B1 discloses a hydraulic double circuit system of a mobile device such as a chain device or a crawler device. In this crawler arrangement, the undercarriage has two crawlers which are each controllable independently of each other via a hydraulic circuit. In addition, the slewing gear and other unit equipment such as booms, bucket handles and buckets are connected to the two hydraulic circuits of the chain drive. Each of the two hydraulic circuits is supplied with pressure medium by an auxiliary hydraulic pump which is controlled depending on the respective highest load pressure of the consumers in the respective assigned circuit. However, other uses are also conceivable for the hydraulic dual circuit system, for example wheeled ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B11/17E02F9/22F15B11/16
CPCF15B2211/3144F15B2211/31582F15B11/165E02F9/2292F15B2211/6052F15B2211/30505F15B11/163E02F9/2296F15B2211/31576F15B2211/329F15B2211/30555F15B11/17F15B2211/20576F15B2211/3111F15B2211/6057F15B2211/20546E02F9/2239F15B2211/40515F15B11/02
Inventor 沃纳·赫尔夫斯冈特·费尔蒂希
Owner BOSCH REXROTH AG
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