Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – With means for proportioning motive fluid supply to plural...
Patent
1994-04-12
1996-05-28
Lopez, F. Daniel
Motors: expansible chamber type
Plural relatively movable or rigidly interconnected working...
With means for proportioning motive fluid supply to plural...
60422, F15B 1116
Patent
active
055200877
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a control device for hydraulically operated machines including construction machineries such as hydraulic excavators, and more particularly to a control device for controlling each working unit according to a type of work to be done.
BACKGROUND ART
A hydraulic excavator has a plurality of working units such as a boom, an arm, a bucket, a swing mechanism and a travel mechanism. These units are operated by an operator who manipulates two operation levers in combination. The type of work to be done is different depending on the situation of a work site, and the order of priority of using these working units varies depending on the type of work. However, when a heavy load is applied to a working unit which is desired to be operated with priority over other working units, the operator has to manipulate the two control levers in a complicated way to decrease the load as well as to move that working unit with priority over the other working units. This is to lay an excessive burden upon the operator and requires him to be skillful. In view of the above circumstances, the applicant of this invention has filed a patent application (Japanese Patent Application No. 19769/1987) for a control device which adds a weight to a command value for a working unit which is desired to be moved with priority over other working units so that, even by naturally manipulating the levers, it can be moved faster than when being moved by a normal manipulation. The invention of this application has been put into practice.
However, the above-mentioned control device is intended to control a swash plate inclination angle of a hydraulic pump in addition to a valve opening degree of a flow rate control valve for controlling a flow rate of pressure oil supplied to hydraulic actuators such as hydraulic cylinders to drive the working units, and to comprehensively control the above-mentioned angle and opening degree depending on the priority order of the working units. In the case of this type of control device, it is necessary to decide at a stage of designing a hydraulic circuit that the control device is built in it and to design an exclusive hydraulic circuit. Therefore, the conventional control device cannot be installed in the existing hydraulic circuits at a later stage by way of so-called "after-installation".
Accordingly, there have been demanded for a cost reduction purpose a simply structured device which can be added to the existing hydraulic circuits so as to be able to control working units according to the order of priority.
SUMMARY OF THE INVENTION
This invention has been made in view of the above circumstances and is to provide a simply structured device which can be added to the existing hydraulic circuits so as to be able to control working units according to the order of priority.
In accordance with the present invention, there is provided a hydraulically operated machine including a plurality of hydraulic actuators disposed in association with a plurality of working units, for actuating the associated working units in accordance with a flow rate of supplied pressure oil, operation valves disposed in association with the plurality of hydraulic actuators, for supplying to the associated hydraulic actuators the pressure oil with a flow rate corresponding to an applied pilot pressure, a hydraulic pump for supplying a discharge pressure oil to the operation valves, operation levers disposed in association with the plurality of working units and, a control valve for receiving signals indicative of manipulated amounts of the operation levers, converting the inputted signals into the pilot pressure and applying the pilot pressure to the associated operation valves, characterized in that the hydraulically operated machine comprises:
storage means for giving a weight to respective same manipulated amount of the plurality of operation levers according to a work type and storing the weight in association with the type of the operation levers and the work type,
selection means for selecti
REFERENCES:
patent: 5029067 (1991-07-01), Nishida et al.
patent: 5074194 (1991-12-01), Hirata et al.
Haraoka Yoshinao
Takamura Fujitoshi
Kabushiki Kaisha Komatsu Seisakusho
Lopez F. Daniel
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