JP2006336497A - Super magnetostrictive hydraulic pressure generating device and super magnetostrictive hydraulic pump system provided with same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a super magnetostrictive hydraulic pressure generating device and a super magnetostrictive hydraulic pressure pump system provided with the device enabling miniaturization and weight reduction of the device, and more efficient use thereof. <P>SOLUTION: The super magnetostrictive hydraulic pressure generating device is provided with pressurized reservoir chamber in an outer circumference zone of the super magnetostrictive drive part in a same housing in which a super magnetostrictive drive part including a super magnetostrictive element changing volume by magnetic force and a drive coil generating magnetic force by excitation to change volume of the super magnetostrictive element, and a pump part including a plunger piston reciprocated in a cylinder with accompanying volume change of the super magnetostrictive element and discharging working fluid from a pressurized reservoir are arranged, and is provided with a communication structure to make at least the drive coil under a condition where the same is dipped in oil from the pressurized reservoir between the pressurized reservoir chamber and the super magnetostictive drive part. The super magnetostrictive hydraulic pressure pump system is provided with an output mechanism and a solenoid valve connected to the generating device and a control mechanism driving and controlling the generating device and the solenoid valve. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a hydraulic pressure generating device configured by forming a hydraulic pump using a giant magnetostrictive material.

  Conventional hydraulic pump devices generally have a configuration in which pressure oil is sucked and discharged using an electric motor as a drive source. However, for the purpose of reducing the size and weight of the device configuration, a drive source that replaces the electric motor is required. Therefore, in recent years, a giant magnetostrictive hydraulic pump device using a giant magnetostrictive element that changes its volume by magnetic force has been proposed. ing.

  In ferromagnetic materials, the element size changes according to a phenomenon called magnetostriction, that is, an external magnetic field generated by a magnet, a coil, or the like. When an orthogonal magnetic field is applied simultaneously, the element twists, and the magnetic characteristics of the element change due to torsional stress. However, the giant magnetostrictive element exhibits a displacement that is much larger than the dimensional change of the conventional ferromagnetic material.

  As a hydraulic pump device using such a giant magnetostrictive element, there are a coil for driving the giant magnetostrictive element, a plunger piston that pumps as the volume of the giant magnetostrictive element changes, and a reservoir tank for supplying and collecting hydraulic oil. There is something with.

  Specifically, for example, a magnetic field is generated by energizing a coil from outside, and the plunger piston is moved against the urging force of the spring by changing the volume of the giant magnetostrictive element in the extension direction by this magnetic field, so that the reservoir tank The pressure piston sucked into the pump chamber is discharged to the actuator through the check valve, and the magnetic field is extinguished by energizing the coil, and the volume of the giant magnetostrictive element is restored in the shrinking direction, so that the plunger piston springs. Continuous hydraulic pump by repetitive operation of sucking pressure oil into the pump chamber and discharging the pressure oil from other pump chambers to the actuator by moving in the opposite direction by urging force, or plunger pump by expansion and contraction of giant magnetostrictive element It can be operated as a single-acting hydraulic pump by reciprocating driving (for example, Reference 1.).

JP 11-93830 A

  However, the conventional hydraulic pump device using the giant magnetostrictive element as described above is configured such that the components of the giant magnetostrictive element and the plunger coil drive unit, and the pressure reservoir tank provided separately from each other exist separately. It consists of a complicated combination structure, and since the giant magnetostrictive element is a heating element and a cooling system such as a drive coil is required, a large occupied space is required for the equipment and in actual use. It was a cumbersome task and it was difficult to use it efficiently.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a giant magnetostrictive hydraulic pressure generator and a giant magnetostrictive hydraulic pump system including the device, which can be reduced in size and weight as compared with conventional devices and can be used more efficiently. It is to provide.

  In order to achieve the above object, a giant magnetostrictive hydraulic pressure generator according to the first aspect of the present invention includes a giant magnetostrictive element that changes in volume by a magnetic force, and a drive that changes the volume of the giant magnetostrictive element by generating a magnetic force when energized. A super magnetostrictive drive unit having a coil, and a pump unit having a plunger piston that reciprocally drives the cylinder in accordance with a volume change of the super magnetostrictive element and discharges hydraulic oil pressure from a pressurized reservoir. In the magnetostrictive hydraulic pressure generator, a pressurized reservoir chamber is provided in an outer peripheral region of the giant magnetostrictive drive unit in the same housing where the giant magnetostrictive drive unit and the pump unit are arranged, and the pressurized reservoir chamber and the giant magnetostriction are provided. A communication structure is provided between the drive unit and at least the drive coil for immersing the drive coil in oil from the pressurized reservoir chamber.

  According to a second aspect of the present invention, there is provided a giant magnetostrictive hydraulic pressure generator according to the first aspect of the present invention, wherein the giant magnetostrictive hydraulic pressure generator is provided between the giant magnetostrictive element and the plunger piston. A transmission member that is separate from both of them that transmits the drive due to the volume change to the plunger piston is provided.

  A giant magnetostrictive hydraulic pressure generator according to a third aspect of the present invention is the giant magnetostrictive hydraulic pressure generator according to the first aspect, wherein the plunger piston includes a plurality of suction check valves. .

  A giant magnetostrictive hydraulic pressure generator according to a fourth aspect of the present invention is the giant magnetostrictive hydraulic pressure generator according to the first aspect, wherein the plunger piston and the housing are made of a non-magnetic material. It is.

  A giant magnetostrictive hydraulic pump system according to a fifth aspect of the present invention is a giant magnetostrictive hydraulic pressure generator according to any one of the first to fourth aspects, an electromagnetic valve and an output mechanism connected to the generator. And a control mechanism for driving and controlling the generator and the electromagnetic valve.

  In the giant magnetostrictive hydraulic pressure generator according to the present invention, the pressurized reservoir chamber as a supply source of the hydraulic oil is provided in the same housing in the outer peripheral region of the giant magnetostrictive drive unit, so that the reservoir tank is separated from the main body of the device. Compared with the case where it is provided, the entire device configuration is reduced in size, and reservoir oil is introduced from the reservoir chamber in the outer peripheral region of the giant magnetostrictive drive unit into the giant magnetostrictive drive unit through a communication structure, and the drive coil is immersed in oil. Since the reservoir oil introduction from the reservoir chamber can also be used as a cooling system to achieve the state, there is an effect that the device can be further reduced in weight, size, and efficiency.

  In the giant magnetostrictive hydraulic pressure generator of the present invention, a giant magnetostrictive drive unit that changes the volume of the giant magnetostrictive element by the magnetic force generated by energizing the drive coil, and a reciprocating drive in the cylinder as the volume of the giant magnetostrictive element changes. A pressure reservoir chamber is provided in the outer peripheral region of the giant magnetostrictive drive unit in the same housing in which the pump unit having a plunger piston for discharging the working pressure oil from the pressure reservoir is disposed. By forming a communication structure between the chamber and the giant magnetostrictive drive unit, the drive coil is immersed in oil from the pressurized reservoir chamber.

  As described above, in the present invention in which the pressurized reservoir chamber that is the supply source of the working pressure oil is provided in the same housing in the outer peripheral region of the giant magnetostrictive drive unit, the reservoir tank is provided separately from the apparatus main body. Occupied space is small compared to the conventional type, and the reservoir oil is introduced from the reservoir chamber in the outer peripheral region of the giant magnetostrictive drive unit into the giant magnetostrictive drive unit of the reservoir oil by the connection structure, and this can also be used as a cooling system. In addition, since at least the drive coil generating the largest amount of heat can be cooled in an oil-immersed state, there is no need to provide a separate cooling system, and the overall device configuration can be reduced in weight, size, and efficiency.

  In this cooling system using reservoir oil, it is more preferable to cool not only the drive coil but also the region where the heating element such as the giant magnetostrictive element and its peripheral members are present in an oil-immersed state as a whole. This cooling system by introducing reservoir oil is composed of a communication structure between the reservoir chamber and the giant magnetostrictive drive unit, but in order to obtain an efficient cooling system, the giant magnetostrictive drive unit side is used for this cooling. A configuration is desired in which a flow is created in the introduced reservoir oil.

  As a communication structure for introducing such reservoir oil from the reservoir chamber, for example, the drive coil and the giant magnetostrictive element constituting the giant magnetostrictive drive unit are disposed in the cylindrical yoke, and the reservoir chamber is provided in the outer peripheral region of the yoke. If provided, if a through hole is formed in the yoke to communicate the reservoir chamber with the inside of the yoke, the drive coil can be immersed in the reservoir oil, and the drive coil portion and the giant magnetostrictive element side in the yoke can be immersed. In the case where a ring member or the like for sealing the gap is disposed, if a part of the ring member is provided with a notch, reservoir oil can be guided around the giant magnetostrictive element to be in an oil-immersed state. In particular, if two through holes are provided, a communication structure in which the reservoir oil flows from the reservoir chamber to the inside of the yoke and from the inside of the yoke to the reservoir chamber can be obtained.

  In addition, the giant magnetostrictive element and the plunger piston may be configured such that both ends are connected to each other and the plunger piston is directly driven by the volume change of the giant magnetostrictive element. If a separate transmission member is arranged and the drive due to the volume change of the giant magnetostrictive element is transmitted to the plunger piston via this transmission member, the eccentric amount of the plunger piston sliding in the cylinder constituted by the housing Can be corrected, and a smoother piston movement is possible.

  In addition, by interposing a separate transmission member between the plunger piston and the giant magnetostrictive element, the possibility of a member to be selected as a material for the plunger piston is expanded, for example, a material that can reduce the weight of the device, such as aluminum. This has the advantage that the capacity of the apparatus can be easily increased. Further, if the housing is made of a non-magnetic material as well as the plunger piston, the device can be further reduced in weight, which also facilitates an increase in the capacity of the device.

  Furthermore, the overall configuration of the apparatus can be simplified by providing a plurality of suction check valves, which are conventionally provided in the hydraulic circuit around the apparatus, in the plunger piston itself.

  As described above, the giant magnetostrictive hydraulic generator of the present invention, which is lighter, smaller and more efficient than the conventional one, is used as a hydraulic pump for the output mechanism of various actuators, etc. If the hydraulic pressure generator and the electromagnetic switching valve are configured to be driven and controlled, an unprecedented small and efficient giant magnetostrictive hydraulic pump system can be constructed.

  A giant magnetostrictive hydraulic pressure generator according to an embodiment of the present invention is shown in a side sectional view of FIG. The giant magnetostrictive hydraulic pressure generator 1 supplies hydraulic pressure to an actuator 20, and is connected to an electromagnetic switching valve 19 and driven and controlled by a control mechanism 18 to construct a hydraulic pump system.

  The giant magnetostrictive hydraulic pressure generator 1 according to the present embodiment has a giant magnetostrictive drive unit, a pump unit, and a reserve disposed in the same housing 15 made of, for example, an aluminum material which is a non-magnetic material. . That is, the giant magnetostrictive drive unit is a drive coil that generates a magnetic force by being wound around the outer periphery of the bobbin 4 and energized by drive control from the control mechanism 18 in a substantially cylindrical yoke 6 fixed in the housing 15. 5 and the giant magnetostrictive element 2 inserted in the bobbin 4 so as to be extendable and contractible are arranged.

  A magnetic material, for example, pure iron transmission member 3 projecting through the yoke 6 in a state of penetrating through the yoke 6 is interposed between a plunger piston 12 made of aluminum, which is a non-magnetic material, at the inner end of the housing of the giant magnetostrictive element 2. To do. The plunger piston 12 is formed in the housing 15 and reciprocally slides in the cylinder 14 to constitute a pump unit of the present apparatus. The plunger piston 12 is driven by transmitting and receiving the expansion and contraction motion of the giant magnetostrictive element 2 that changes its volume in accordance with the generation and disappearance of the magnetic force when the drive coil 5 is energized and de-energized.

  In the outer peripheral area of the yoke 6, a pressurized reservoir chamber 8 is provided that is surrounded by an inner wall surface of the housing 15 and a wall member 9 slidably provided along the outer surface of the yoke 6. . The pressurized reservoir chamber 8 is in a pressurized state by a wall member 9 urged by a spring 10 from the opposite side, and the wall volume 9 slides against the urging force of the spring 10 to reduce the volume of the chamber. It will increase.

  Further, two through holes 7 are formed in the yoke 6 as a communication structure with the reservoir chamber 8, and the reservoir oil introduced into the yoke 6 from one through hole 7 passes through the other through hole 7. A flow returning to the reservoir chamber 8 is created to form a cooling system that cools the drive coil 5 in an immersion state. Further, the ring member 11 that seals between the bobbin 4 and the giant magnetostrictive element 2 is partially cut away (not shown), whereby the reservoir oil introduced into the yoke 6 is supplied to the drive coil. In addition to 5, the giant magnetostrictive element 2 and the transmission member 3 can be immersed to cool the entire periphery of the heating element.

  The plunger piston 12 itself has a plurality of (three in FIG. 1) suction check valves 13 that check against the return pressure oil from the actuator 20 side and communicate with the reservoir chamber 8. Is provided at the opening of the end of the.

  The operation of the giant magnetostrictive hydraulic pressure generator 1 having the above configuration is as follows. First, in a state where the drive coil 5 is not energized and no magnetic force is generated, the giant magnetostrictive element 2 is contracted in the axial direction in the bobbin 4, whereby the plunger piston 12 is connected to the coil side via the transmission member 3 ( It is drawn to the right in the figure. Therefore, the space volume on the left side of the plunger piston 12 is expanded in the cylinder 14, and reservoir oil is sucked into the left space from the reservoir chamber 8 through the check valves 13 via the flow paths in the plunger piston 12. Yes.

  Next, when the drive coil 5 is energized by drive control by the control mechanism 18 to generate a magnetic force, the giant magnetostrictive element 2 extends in the axial direction in the bobbin 4, and the transmission member 3 moves the plunger piston 12 along with this volume change. The plunger piston 12 which is pushed out to the opposite side (leftward in the drawing in the drawing) and moves to the left discharges the reservoir oil sucked into the left space in the cylinder 14 to the actuator 20. By repeatedly energizing the drive coil 5 and releasing the energization as described above, the plunger pump 12 reciprocates in the cylinder 14 and operates as a hydraulic pump. During this time, the drive coil 5, the giant magnetostrictive element 2, and the transmission member 3, which are heating elements, are cooled while immersed in reservoir oil flowing from the reservoir chamber 8 through the through holes 7 of the yoke 6.

  In the giant magnetostrictive hydraulic pump system, the operation of the actuator is stopped by switching the electromagnetic switching valve 19 by drive control from the control mechanism 18. That is, the return oil from the actuator 20 flows into the right space of the plunger piston 12 in the cylinder 14 via the electromagnetic switching valve 19 and is introduced into the reservoir chamber 8. The reservoir chamber 8 can be expanded in volume by sliding the wall member 9 against the spring 10 by the pressure of the return oil.

  As described above, the giant magnetostrictive hydraulic pressure generating device 1 according to the present embodiment has a reservoir chamber and a heating element cooling system that are compactly provided in the same housing, and thus the overall weight, size and efficiency of the device can be realized. is there. If this hydraulic pressure generator 1 is used, a giant magnetostrictive hydraulic pump system can be easily constructed with a simple design.

1 is a side sectional view showing a schematic configuration of a giant magnetostrictive hydraulic pressure generator according to an embodiment of the present invention.

Explanation of symbols

1: Giant magnetostrictive hydraulic pressure generator 2: Giant magnetostrictive element 3: Transmission member 4: Bobbin 5: Drive coil 6: Yoke 7: Through hole 8: Reservoir chamber 9: Wall member 10: Spring 11: Ring member 12: Plunger piston 13: Check valve 14: Cylinder 15: Housing 18: Control mechanism 19: Electromagnetic switching valve 20: Actuator

Claims (5)

A giant magnetostrictive drive unit having a giant magnetostrictive element that changes in volume by a magnetic force, and a drive coil that changes the volume of the giant magnetostrictive element by generating a magnetic force when energized, and reciprocates in the cylinder as the volume of the giant magnetostrictive element changes. In a giant magnetostrictive hydraulic pressure generator comprising: a pump unit having a plunger piston that drives and discharges working pressure oil from a pressurized reservoir;
A pressurized reservoir chamber is provided in an outer peripheral region of the giant magnetostrictive drive unit in the same housing where the giant magnetostrictive drive unit and the pump unit are disposed;
A giant magnetostrictive hydraulic system comprising a communication structure between at least the drive reservoir and the giant magnetostrictive drive unit for immersing at least the drive coil in oil from the pressurized reservoir chamber. Generator.   The transmission member separate from both of which the drive by the volume change of this super magnetostrictive element is transmitted to this plunger piston between said super magnetostrictive element and said plunger piston is provided. Giant magnetostrictive hydraulic generator.   2. The giant magnetostrictive hydraulic pressure generating apparatus according to claim 1, wherein the plunger piston includes a plurality of suction check valves.   2. The giant magnetostrictive hydraulic pressure generator according to claim 1, wherein the plunger piston and the housing are made of a non-magnetic material. A giant magnetostrictive hydraulic pressure generator according to any one of claims 1 to 4, an electromagnetic valve connected to the generator and an output mechanism, and a control mechanism for driving and controlling the generator and the electromagnetic valve. Giant magnetostrictive hydraulic pump system.

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