Power plants – Pressure fluid source and motor – Having correlated or joint actuation of controller of input...
Patent
1996-04-29
1999-03-30
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Having correlated or joint actuation of controller of input...
191 10, 417411, F16D 3102
Patent
active
058874305
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a hydraulic source having a power feeding apparatus and a hydraulic source circuit for supplying hydraulic pressure to a hydraulic cylinder, in which the power feeding apparatus supplies high frequency voltage to a power receiving side of the hydraulic source circuit under non-contact condition. Further, the present invention relates to a working machine provided with the above-mentioned hydraulic source.
BACKGROUND ART
As a power source used in a mechanical field in which a large power is required while at work such as a machine tool field or a cargo handling machine field, conventionally there exists such a tendency that the power source has changed from hydraulic type to electric type with the advance of the times, from the standpoints of both high response speed and clean energy. However, in the case where the power source is used by placing great importance on large power generation and long power duration rather than response speed, hydraulic source is still used, in spite of the fact that there exists a problem with respect to piping arrangement and power intermission. This is because although the electric power source is superior to the hydraulic power source from the standpoint of easiness in wiring and power control, since a large-sized direct-driven type actuator and a large capacity storage function are both required to generate large power and to control the generated large power autonomically, the electric power source is inferior to a pressurized power source from the standpoints of size and stability at the present stage. Further, although it may be possible to consider to combine both merits of the hydraulic power source and the electric power source appropriately, such a power source as described above has been not yet reported.
In the field of machine tools, for instance, as a method of fixing an object to be machined (referred to as "workpiece", hereinafter) to a jig mounted on a table of the machine tool, it is general to fasten a workpiece manually by use of a screw or a cam (referred to as "clamping", hereinafter). However, a method of clamping a workpiece by use of a hydraulic cylinder has been adopted partially to automatize the fixing of the workpiece to the jig.
FIG. 43 is a diagrammatical structural view showing a first prior art machine tool, on which a hydraulic type workpiece clamping device for clamping the workpiece by use of a hydraulic cylinder is mounted.
In FIG. 43, a machine tool 100 includes a hydraulic source 104 composed of a first hydraulic cylinder 103a for clamping the right end of a workpiece 120, a second hydraulic cylinder 103b for clamping the left end of the same workpiece 120 both mounted on a pallet 101, a hydraulic pump 104a, a hydraulic tank 104b, a solenoid valve 104c, a hydraulic motor 104d for driving a hydraulic pump 104a, and a hydraulic switch (not shown), etc.; a first hydraulic pipe 106a for communication between the first hydraulic cylinder 103a and the hydraulic source 104; and a second hydraulic pipe 106b for communication between the second hydraulic cylinder 103b and the hydraulic source 104. In the machine tool 100, a hydraulic pressure can be generated by driving the hydraulic driving motor 104a, and the generated hydraulic force is transmitted through the first and second hydraulic pipes 106a and 106b, respectively to move two rods of the first and second hydraulic cylinders 103a and 103b in the downward direction in FIG. 43, respectively, that is, to clamp a workpiece 120.
In the above-mentioned machine tool 100, however, since hydraulic pressure is transmitted from the hydraulic source 104 to the first and second hydraulic cylinders 106a and 106b, respectively, the first and second hydraulic pipes 106a and 106b are indispensable, thus causing the following problems: (1) in the case of a pallet jig of a horizontal machining center and a jig of a transfer machine, since the jig is moved freely without relation to the movement of the machine tool, it is particularly difficult to arrange
REFERENCES:
patent: 4836344 (1989-06-01), Bolger
patent: 5190358 (1993-03-01), Holzmann et al.
patent: 5197787 (1993-03-01), Matsuda et al.
patent: 5207304 (1993-05-01), Lechner et al.
Aoyama Yoshio
Hamamoto Hiroyuki
Hiraga Yoshiji
Hirai Junji
Hirose Kenji
Kabushiki Kaisha Yaskawa Denki
Lopez F. Daniel
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