Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1999-06-25
2000-11-28
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
F16D 3102
Patent
active
061518948
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a hydraulic actuator return pressure fluid recovery system and in particular to a system for recovery of flows of a hydraulic pressure fluid returned from a plurality of hydraulic actuators, and thereby recycling the fluid to drive another actuator.
BACKGROUND ART
It has hitherto been the practice to connect a return circuit from one given hydraulic actuator to another hydraulic actuator whereby to recover and recycle a return fluid from the one actuator to drive the other actuator.
A recovery apparatus known in the art is available to recycle a hydraulic apparatus in which only one hydraulic actuator is included as operable at a time. Unfortunately, it is not applicable to a working machine such as a hydraulic power shovel in which a plurality of hydraulic actuators such as a boom cylinder, an arm cylinder and a turning hydraulic motor are included and where these actuators must be operated simultaneously.
In particular, if in the known apparatus the return circuits of such more than one hydraulic actuators are connected to one separate hydraulic actuator, these return circuits are in effect placed in fluid communication with each other. Then, an attempt to operate one of the actuators in a direction opposite to its return direction may cause all the actuators to so operate simultaneously.
It is accordingly an object of the present invention to provide an actuator return fluid recovery apparatus which is designed to resolve the problem mentioned above.
SUMMARY OF THE INVENTION
In order to achieve the object mentioned above, there is provided in accordance with the present invention in a certain form of implementation thereof a hydraulic actuator return pressure fluid recovery system that comprises a plurality of fluid recovery circuits associated with a plurality of hydraulic actuators for accepting flows of a hydraulic pressure fluid returned from the said actuators; a main fluid recovery circuit; and a selector means that permits at least one of said plural fluid recovery circuits selectively to communicate with the said main fluid recovery circuit.
The system construction described above in which at least one of a plurality of return fluid recovery circuits are rendered to selectively communicate with a main fluid recovery circuit, permits recovery of a pressure fluid from at least one of a plurality of hydraulic actuators.
Thus, the system is applicable to a working machine involving a plurality of hydraulic actuators.
In the system construction described above, it is preferred that the said selector means be designed to selectively establish a first state in which only any one of the said fluid recovery circuits is placed in fluid communication with the said main fluid recovery circuit and a second state in which more than one of the said fluid recovery circuits lie in fluid communication with the said main fluid recovery circuit.
The preferred system construction just described which enables a plurality of fluid recovery circuits to be individually placed in fluid communication with the main fluid recovery circuit permits a return fluid solely from any one of the actuators when it is singly operated to be recovered.
That preferred system construction which also enables more than one fluid recovery circuits to communicate with the main fluid recovery circuit allows flows of return fluid from more than one hydraulic actuators when they are simultaneously operated to merge into a single flow to be recovered.
In the preferred system construction noted above, it is further preferred that the said selector means when more than one of said fluid recovery circuits lie in fluid communication with said main fluid recovery circuit be designed to establish a third state in which a hydraulic return pressure fluid flow from a particular one of the said fluid recovery circuits preferentially is admitted into the said main fluid recovery circuit.
The further preferred system construction just described permits a return pressure fluid from only one of more than
REFERENCES:
patent: 4928487 (1990-05-01), Nikolaus
patent: 5878569 (1999-03-01), Satzler
Endo Hiroshi
Maruta Kazuhiro
Yoshida Nobumi
Komatsu Ltd.
Lopez F. Daniel
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