Patent Publication Number: US-9404471-B2

Title: Hydraulic engine including hydraulic power unit

Description:
BACKGROUND 
     1. Field 
     One or more embodiments of the present invention relate to a hydraulic engine, and more particularly, to a hydraulic power unit that includes a ceramic oscillator and inpours and extrudes a fluid in association with the ceramic oscillator, and a hydraulic engine that includes the hydraulic power unit and generates rotatory power. 
     2. Description of the Related Art 
     In general, power (rotatory power) for driving vehicles, various machines, or mechanisms is obtained by burning a fossil fuel. When the fossil fuel is burned, a large amount of carbon dioxide is generated, and various harmful substances are mass-produced, which is a major cause of environmental pollution. In addition, it is widely known that there is a limitation in relying on fossil fuel because the amount of fossil fuel such as crude oil or coal which exists on earth is limited. For this reason, humans have tried to develop new energy sources and have conducted research into methods of effectively using existing energy sources. 
     Among the research results achieved so far, a method of obtaining power for a vehicle or a machine by using electrical energy obtained through battery charging, a method of burning existing fossil fuel, and a hybrid method using a battery have been developed. However, existing power generation apparatuses (engines) which utilize electrical energy have a performance limit. For this reason, there are increasing demands to develop new power generation apparatuses that do not generate carbon dioxide when used, use eco-friendly electrical energy, and have better performance and a long lifespan. 
     SUMMARY 
     One or more embodiments of the present invention include a new engine that generates rotatory power by using deformation energy of eco-friendly ceramics, the engine having improved performance and a long lifespan. 
     One or more embodiments of the present invention include a hydraulic power unit which is environmentally friendly, has a long lifespan, and may extrude a working fluid by using a strong force, which may be used in order to form a new engine. 
     Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments. 
     According to one or more embodiments of the present invention, a hydraulic engine includes a hydraulic power unit comprising a hydraulic tube comprising a hollow portion having an opened front end and being filled with a fluid, an amplitude amplification device that is disposed at the rear side of the hydraulic tube, an oscillator that is disposed at the rear side of the amplitude amplification device so as to be deformed and increases and decreases a pressure within the hydraulic tube, and an oscillator head that is attached to a front end of the oscillator. The hydraulic tube extends in a longitudinal direction, comprises a metal tube formed on the outside thereof and an elastic tube formed on the inside thereof, and is configured in the form of a double tube having an outer hollow and an inner hollow. The amplitude amplification device comprises a casing having a hollow formed therein, a swell tube that is disposed within the casing and has a cylindrical hollow therein, a plurality of vibration rods that are disposed in the hollow of the swell tube, and an elastic chip that is disposed in the hollow of the swell tube, intersects with the hollow, and is disposed between the plurality of vibration rods. The oscillator moves bidirectionally and changes a pressure within the hydraulic tube by applying deformation force to the vibration rod according to its deformation so that a fluid within the hydraulic tube is extruded to the outside or flows into the hydraulic tube. 
     The oscillator may be deformed in a direction toward the inside of the hollow portion of the hydraulic tube and in an opposite direction when electricity is applied thereto by an inverse piezoelectric effect. 
     The hydraulic tube may include a front position fixation holder and a rear position fixation holder that is disposed within the metal tube and comes into contact with a front side and a rear side of the elastic tube, and a connection jig that is disposed at a front end of the metal tube and is disposed so as to come into contact with the front side of the position fixation holder of the elastic tube. The position fixation holder may be disposed so as to come into contact via a seal ring with at least one vibration rod included in the amplitude amplification device. At least a portion of the connection jig seals the outer hollow. An opening may be formed in at least a portion of the connection jig so as to cause the inner hollow and the outside to communicate with each other. A side through hole may be formed at one side of the metal tube so as to cause the outer hollow and the outside to communicate with each other. 
     The hydraulic tube may include a plurality of first elastic links. The elastic tube may be formed as a corrugated pipe having a plurality of corrugations extending in a longitudinal direction. The first elastic link may be disposed so as to come into contact with a concave portion of the corrugation and to extend in a longitudinal direction along the corrugation. One end of the first elastic link may come into contact with the connection jig through the front position fixation holder, the other end thereof may come into contact with the vibration rod through the position fixation holder, and the elastic tube may be pressed in a horizontal direction according to a deformation force of the vibration rod. 
     The first elastic link may be formed by bending an elongated steel wire. The first elastic link may include first curved portions, which are both sides of the steel wire being bent inwards in a longitudinal direction, and second curved portions, which are both ends of the steel wire being bent and gathered together toward the center through the first curved portions. The second curved portion may have a ring shape. 
     A lower portion of the second curved portion may come into contact with at least a portion between the first curved portions. 
     The elastic chip may be formed of a material having an elastic restoring force, the elastic chip having a form of a circular plate with a protruding central portion, and may be provided with a plurality of holes formed along a circumference thereof. 
     The holes may be formed in a fan shape with a portion of the circumference of the elastic chip forming an arc thereof. 
     The swell tube may include a plurality of second elastic links that are disposed along a circumferential surface of the vibration rod. 
     The second elastic link may be formed by bending an elongated steel wire. The second elastic link comprises first curved portions, which are both sides of the steel wire being bent inwards in a longitudinal direction, and second curved portions, which are both ends of the steel wire being bent and gathered together toward the center through the first curved portions. The second curved portion may have a ring shape. 
     The lower portion of the second curved portion may come into contact with at least a portion between the first curved portions. 
     The elastic chip may be disposed at a position overlapping a position at which the second curved portion is disposed. 
     According to one or more embodiments of the present invention, a hydraulic engine includes the hydraulic power unit; a housing; a rotor that is rotatably supported within the housing and has a rotor blade disposed on the circumference thereof; and a flange that is disposed within the housing. The flange comprises a front flange and a rear flange, and a rotor is disposed between the front flange and the rear flange. The rear flange comprises a fixation hole for fixing the hydraulic power unit and an extrusion hole. The extrusion passage is configured to cause the rotor blade of the rotor and an inner hollow of a hydraulic tube included in the hydraulic power unit to communicate with each other. The front flange comprises a fluid chamber and a discharge hole so that a fluid inpoured through the rotor blade is bidirectionally discharged. 
     The extrusion passage may have a tilt angle with respect to the rotor blade so that the fluid extruded from the hydraulic tube applies an extrusion force to the rotor blade to thereby rotate the rotor. 
     The fluid chamber and the discharge hole formed in front of the front flange and a side through hole formed in a metal tube of the hydraulic tube may be connected to each other so that the fluid flows therebetween. 
     The hydraulic engine may further include an operational module that drives the hydraulic power unit, adjusts a number of rotations and torque of the rotor, and comprises a secondary battery as a driving power source. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and/or other aspects will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which: 
         FIG. 1  is a diagram illustrating a contour of a hydraulic engine according to an embodiment of the present invention; 
         FIG. 2  is a diagram illustrating a structure of a hydraulic power unit included in the hydraulic engine according to the embodiment of the present invention; 
         FIG. 3  is a diagram illustrating first and second elastic links included in a hydraulic tube and an amplification device of the hydraulic engine according to the embodiment of the present invention; 
         FIG. 4  is a diagram illustrating a structure of the hydraulic tube of the hydraulic engine according to the embodiment of the present invention; 
         FIG. 5  is a diagram illustrating a front position fixation holder; 
         FIG. 6  is a diagram illustrating a rear position fixation holder; 
         FIG. 7  is a diagram illustrating a structure of an amplitude amplification device of the hydraulic engine according to the embodiment of the present invention; 
         FIG. 8  is a cross-sectional view taken along a line A-A of  FIG. 4 ; 
         FIG. 9  is a cross-sectional view taken along a line B-B of  FIG. 7 ; 
         FIG. 10  is a diagram illustrating a structure of a portion of the amplitude amplification device of the hydraulic engine according to the embodiment of the present invention; 
         FIG. 11  is a diagram illustrating the hydraulic engine according to the embodiment of the present invention; 
         FIG. 12  is a diagram illustrating a rear flange of the hydraulic engine according to the embodiment of the present invention; 
         FIG. 13  is a diagram illustrating a front flange of the hydraulic engine according to the embodiment of the present invention; 
         FIG. 14  is a diagram illustrating a flow of a working fluid of the hydraulic engine according to the embodiment of the present invention; and 
         FIG. 15  is a diagram illustrating the whole hydraulic flow of a working fluid of the hydraulic engine according to the embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. In this regard, the present embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the embodiments are merely described below, by referring to the figures, to explain aspects of the present description. Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list. 
       FIG. 1  is a diagram illustrating a hydraulic engine according to an embodiment of the present invention.  FIG. 2  is a diagram illustrating a structure of a hydraulic power unit included in the hydraulic engine according to the embodiment of the present invention.  FIG. 3  is a diagram illustrating first and second elastic links included in a hydraulic tube and an amplification device of the hydraulic engine according to the embodiment of the present invention.  FIG. 4  is a diagram illustrating a structure of the hydraulic tube of the hydraulic engine according to the embodiment of the present invention.  FIG. 5  is a diagram illustrating a front position fixation holder. 
       FIG. 6  is a diagram illustrating a rear position fixation holder.  FIG. 7  is a a diagram illustrating a structure of an amplitude amplification device of the hydraulic engine according to the embodiment of the present invention.  FIG. 8  is a cross-sectional view taken along a line A-A of  FIG. 4 .  FIG. 9  is a cross-sectional view taken along a line B-B of  FIG. 7 .  FIG. 10  is a diagram illustrating a structure of a portion of the amplitude amplification device of the hydraulic engine according to the embodiment of the present invention. 
     Hereinafter, a hydraulic power unit  1  of a hydraulic engine according to the present invention will be described. 
     The hydraulic power unit  1  according to the present invention includes a hydraulic tube  100  that has a hollow portion that has an opened front end and is filled with a fluid, an amplitude amplification device  200  that is disposed at the rear side of the hydraulic tube  100 , and an oscillator  300  that is disposed at the rear side of the amplitude amplification device  200  so as to be deformed and increases and decreases a pressure within the hydraulic tube  100 . 
     The hydraulic tube  100  extends in a longitudinal direction. The hydraulic tube  100  includes a metal tube  112  formed on the outside thereof and an elastic tube  114  formed on the inside thereof, and is configured in the form of a double tube having an outer hollow  116  and an inner hollow  118 . 
     The amplitude amplification device  200  includes a plurality of casings  212  having a hollow formed therein, a plurality of swell tubes  214  that are respectively disposed within the casings  212  and have a cylindrical hollow therein, a plurality of vibration rods  230  that are respectively disposed in the hollows of the swell tubes  214 , and a plurality of elastic chips  220  that are respectively disposed in the hollows of the swell tubes  214 , intersect with the hollows, and are disposed between the vibration rods  230 . 
     The oscillator  300  is configured to move bidirectionally and changes a pressure of fluid within the hydraulic tube  100  by applying a deformation force to the vibration rod  230  according to its deformation so that the fluid within the hydraulic tube  100  is extruded to the outside or flows into the hydraulic tube  100 . 
     Hereinafter, the hydraulic tube  100  will be described. 
     The hydraulic tube  100  is a tube type structure having a hollow that extends in a longitudinal direction and is filled with a working fluid. 
     Specifically, the hydraulic tube  100  is formed in the form of a double tube including the metal tube  112  formed on the outside thereof and the elastic tube  114  formed on the inside thereof and has the outer hollow  116  and the inner hollow  118 . That is, the elastic tube  114  is disposed within the metal tube  112 , and thus, the hydraulic tube  100  has a double tube structure in which the inner hollow  118  is formed within the elastic tube  114 , the outer hollow  116  is formed between the elastic tube  114  and the metal tube  112 , and the inner hollow  118  is formed within the outer hollow  116 . 
     The metal tube  112  is formed of a metal material, and the elastic tube  114  is formed of a metal or an elastic material. The elastic tube  114  may be formed of a material having an elastic restoring force, for example, a metal, plastic, or rubber. 
     Hereinafter, the amplitude amplification device  200  will be described. 
     The amplitude amplification device  200  is disposed at the rear side of the hydraulic tube  100 . The amplitude amplification device  200  includes the plurality of casings  212  having a hollow formed therein, the plurality of swell tubes  214  that are respectively disposed within the casings  212  and have a cylindrical hollow therein, the plurality of vibration rods  230  that are respectively disposed in the hollows of the swell tubes  214 , and the plurality of elastic chips  220  that are respectively disposed in the hollows of the swell tubes  214 , intersect with the hollows, and are disposed between the vibration rods  230 . 
     The plurality of casings  212  are configured as a housing of the amplitude amplification device  200 , and may have a cylindrical shape having a hollow formed therein. 
     The swell tube  214  is disposed within the casing  212 , and may have a cylindrical shape having a hollow formed therein in a similar manner to the casing  212 . 
     The swell tube  214  may have a structure in which a plurality of second elastic links  260  are arrayed in the form of a cylinder. That is, the plurality of second elastic links  260  extend in a longitudinal direction are disposed in a circumferential direction so as to form a cylindrical tube, thereby completing the swell tube  214 . The second elastic link  260  will be described below in detail. 
     The vibration rod  230  is disposed within the swell tube  214 . The vibration rod  230  is a member having a configuration of a cylindrical beam and is disposed within the swell tube  214 . At least one vibration rod  230  is disposed within the swell tube  214 . 
     Meanwhile, a spool or a plunger may be provided at the front end of the vibration rod  230 , but the present invention is not limited thereto. 
     As illustrated in  FIG. 7 , the plurality of elastic chips  220  are disposed within the swell tube  214 , and each of the elastic chips  220  is has a circular plate for before deformation and crosses the hollow of the swell tube  214 . The elastic chip  220  is disposed within the swell tube  214  so as to come into contact with the vibration rod  230 . The elastic chip  220  includes a plurality of holes  222  formed along a circumference thereof. Meanwhile, as illustrated in  FIG. 9 , the holes  222  are radially disposed, and may be formed in a fan shape with an inner side of the hollow forming an arc thereof. 
     In addition, the elastic chip  220  is formed of a material having an elastic restoring force, and may be a Belleville spring that is formed of, for example, a metal. Meanwhile, for example, the elastic chip  220  may have a shape with a protruding center portion. Thus, the elastic chip  220  is deformed in accordance with an increase or decrease in an external force or the presence or absence of an external force. For example, the elastic chip  220  may be deformed from a flat shape before the deformation to a curved shape in accordance with the application of an external force. The elastic chip  220  is formed of an elastic material, and thus, has a restoring force according to its deformation. 
     Meanwhile, the elastic chip  220  is disposed to come into contact with the vibration rod  230  and the oscillator head  310  and to receive a pressing force from the oscillator head  310 . Accordingly, the elastic chip  220  maintains its flat shape in an initial state when an external force is not applied thereto. Subsequently, when an external force is applied to the elastic chip  220  from the oscillator  300 , the elastic chip  220  is deformed into a curved shape according to its restoring force. 
     Hereinafter, the oscillator  300  will be described. 
     The oscillator  300  is disposed at the rear end of the hydraulic power unit  1 , and may be deformed in a longitudinal direction of the hydraulic power unit  1 . The oscillator  300  is constituted by a piezoelectric element, and is preferably formed as a stack including piezoelectric elements. Meanwhile, the oscillator head  310  that transmits a force according to the deformation of the oscillator  300  may be disposed at a tip of the oscillator  300 . At this time, the oscillator head  310  is partially inserted into the swell tube  214  so as to come into contact with the elastic chip  220 . Thus, the elastic chip  220  may be disposed between the oscillator head  310  and the vibration rod  230  to thereby receive a pressing force from both the oscillator head  310  and the vibration rod  230 . In addition, a connecting device may be disposed in an operational module for driving the oscillator  300 . 
     Meanwhile, the hydraulic engine  2  may further include an operational module (not shown) that drives the hydraulic power unit  1  by applying an operational signal to the oscillator  300 , adjusts a number of rotations and a torque of the rotor, and includes a secondary battery as a driving power source. 
     The hydraulic engine  2  may further include an oscillator housing  414  so as to surround the oscillator  300 . The oscillator housing  414  may be filled with an insulation oil so as to reduce the temperature of the oscillator  300  which increases due to the operation of the oscillator  300 . The oscillator housing  414  may include an opened hole  416  through which the insulation oil within the oscillator housing  414  flows and a predetermined pipe so as to move the insulation oil. The pipe may communicate with a predetermined cooling unit. The cooling unit includes a predetermined pipe structure and a cooling device, and prevents the temperature of the oscillator  300  from excessively increasing, thereby preventing a reduction of the operational efficiency of the hydraulic power unit  1  and a hydraulic engine  2  according to the present invention. 
     Preferably, the oscillator  300  is deformed when electricity is applied thereto by an inverse piezoelectric effect, and is deformed in a direction toward the inside of the hollow portion of the hydraulic tube  100  and in a direction opposite thereto. 
     Hereinafter, more detailed configurations and a connection structure of components constituting the hydraulic power unit  1  will be described. 
     Preferably, the hydraulic tube  100  includes position fixation holders  180  and  181 , which are disposed within the metal tube  112  and respectively come into contact with the front side and the rear side of the elastic tube  114 , and a connection jig  130  that is disposed at a front end of the metal tube  112  and at the same time in front of the front position fixation holder  181  coming into contact with the front side of the elastic tube  114 . 
     The connection jig  130  may be a member that is disposed to fix the hydraulic power unit  1  to the hydraulic engine  2  when configuring the hydraulic engine  2  by using the hydraulic power unit  1 . For example, the connection jig  130  may have a pipe shape having a male screw portion formed on the outside thereof and having an opening  132  therein. 
     At least a portion of the connection jig  130  seals the outer hollow  116 , and the opening  132  may be formed in at least a portion of the connection jig  130  so that the inner hollow  118  communicates with the outside. 
     That is, as illustrated in  FIG. 2 , the connection jig  130  is configured in such a manner that a portion thereof extends in a circumferential direction. The extended portion seals a front end of the outer hollow  116  formed between the metal tube  112  and the elastic tube  114  so as to block the communication between the outer hollow  116  and the inner hollow  118 . In addition, the opening  132  is formed in a center portion of the connection jig  130  so that the inner hollow  118  formed by the elastic tube  114  communicates with the outside. 
     Meanwhile, a side through hole  160  is formed at one side of the metal tube  112  so that the outer hollow  116  communicates with the outside. The movement of a fluid through the side through hole  160  will be described below. 
     The position fixation holders  180  and  181  are respectively disposed at the front side and the rear side of the hydraulic tube  100 . In addition, the position fixation holders  180  and  181  are disposed within the metal tube  112  so as to respectively come into contact with the front and rear sides of the elastic tube  114 . That is, the elastic tube  114  is disposed between the position fixation holders  180  and  181  and the connection jig  130 , and the movement of a fluid between the outer hollow  116  and the inner hollow  118  may be blocked by the position fixation holders  180  and  181  and the connection jig  130 . 
     The position fixation holder  180  is disposed to come into contact through a seal ring  150  with at least one vibration rod  230 , which is included in the amplitude amplification device  200 . The position fixation holder  180  may transmit a deformation force according to the vibration rod  230  to a fluid within the hydraulic tube  100  through the elastic link  170 . 
     The elastic tube  114  is formed as a corrugated pipe having a plurality of corrugations extending in a longitudinal direction, and thus, a cross-section of the elastic tube  114  in a horizontal direction may have such a shape with alternating concave portions and convex portions. For example, as illustrated in  FIG. 8 , the cross-section of the elastic tube  114  may have a star shape in which a plurality of convex portions and a plurality of concave portions are formed in a circumferential direction. 
     The elastic link  170  is disposed in the concave portion of the elastic tube  114 . 
     The elastic link  170  is formed of a material having stiffness and elasticity like an elongated steel wire. 
     The elastic link  170  is formed by bending an elongated straight steel wire. For example, the elastic link  170  is formed by bending both ends of the steel wire inwards in a longitudinal direction as illustrated in  FIG. 3  and then by bending the both ends gathered together toward the center, and thus, the elastic link  170  has a ring shape. Thus, the elastic link  170  may include first curved portions formed at both ends and second curved portions formed to come into contact with each other on the inner side. Meanwhile, an elongated straight portion is formed between the curved portions. 
     The second curved portion is bent in the form of a ring, and may be preferably configured such that a lower portion of the ring comes into contact with the straight portion below the ring. That is, the lower portion of the second curved portion may come into contact with at least a portion between the first curved portions. 
     Thus, when the both ends of the elastic link  170  are pressed in a state where the upward deformation of the elastic link  170  is limited, the elastic link  170  may be deformed in such a manner that the second curved portions having a ring shape are gathered together on the inner side and press the straight portion below the second curved portions so as to be bent downwards. 
     The elastic link  170  is a member having a configuration and arrangement as presented above, and it should be understood that the elastic link  170  is not a member for connecting other members. 
     Meanwhile, the predetermined position fixation holders  180  and  181  may be provided so as to appropriately position the elastic link  170  within the hydraulic tube. The position fixation holders  180  and  181  are provided at both ends of the elastic link  170  and the elastic tube  114 . As illustrated in  FIG. 4 , a predetermined step height formed in the inner surface of the of connection jig  130  may function as the position fixation holder  181 . 
     That is, the elastic link  170  is disposed in front of the vibration rod  230  so as to be interposed between the connection jig  130  and position fixation holders  180  and  181 . Thus, as described above, when a deformation force is applied the elastic link  170  through the vibration rod  230 , the elastic link  170  is deformed in a direction of an inner diameter, and thus, the elastic link  170  presses the elastic tube  114 , thereby changing a pressure of a fluid within the elastic tube  114 . 
     The elastic link  170  according to the current embodiment may be more stably fixed between the connection jig  130  and the position fixation holders  180  and  181 , and the second curved portions bent in the form of a ring come into contact with the straight portion disposed below the second curved portions. Thus, the elastic link  170  may be more stably deformed in the direction of the inner diameter due to the deformation force in both lateral directions. Accordingly, the fluid within the hydraulic tube  100  may be more smoothly extruded or inpoured. 
     That is, when the elastic link  170  is compressed by the vibration rod  230  in a longitudinal direction, the second curved portions are pressed inwards against each other, and thus, the second curved portions press the straight portion, which is disposed below the second curved portions, downwards. Thus, when the vibration rod  230  presses the elastic link  170 , the straight portion is prevented from being deformed upwards and is pressed downwards due to the pressure of the second curved portions to thereby be deformed. In addition, the vibration rod  230  presses the elastic link  170  so that the elastic tube  114  is deformed inwards. 
       FIGS. 9 and 10  illustrate the amplitude amplification device  200 . 
     The amplitude amplification device  200  according to the current embodiment includes the plurality of casings  212  having a hollow formed therein, the plurality of second elastic links  260  that are respectively disposed in the hollows of the casings  212  so as to constitute a tube, the plurality of vibration rods  230  that are disposed in the tube constituted by the elastic links, and the plurality of elastic chips  220  that are respectively disposed in the hollows of the swell tubes  214  so as to intersect with the hollows. 
     The casing  212 , the vibration rod  230 , and the elastic chip  220  are as described above. Herein, a detailed configuration of the swell tube  214  will be described. 
     The second elastic link  260  constituting the swell tube  214  has a similar structure to the elastic link  170  which is described with respect to the hydraulic tube  100 . That is, the second elastic link  260  is formed by bending an elongated steel wire. For example, the elastic link  170  is formed by bending both ends of the steel wire inwards in a longitudinal direction as illustrated in  FIG. 3  and then by bending the both ends gathered together toward the center, and thus the second elastic link  260  has a ring shape. Thus, the elastic link  170  may include first curved portions formed at both ends and second curved portions formed to come into contact with each other on the inner side. Meanwhile, an elongated straight portion is formed between the curved portions. 
     The second curved portion is bent in the form of a ring, and may be preferably configured such that a lower portion of the ring comes into contact with the straight portion below the ring. Thus, when the both ends of the second elastic link  260  are pressed in a state where the upward deformation of the second elastic link  260  is limited, the second elastic link  260  may be deformed in such a manner that the second curved portions having a ring shape are gathered together on the inner side and press the straight portion below the second curved portions so as to be bent downwards. 
     Meanwhile, the elastic chip  220  may be disposed to cover the second curved portions. That is, as illustrated in  FIG. 9 , the elastic chip  220  may be disposed in a portion where the second curved portions are gathered together on the inner side. Thus, a deformation due to pressing may be concentrated on the elastic chip  220  which is disposed at a position where the second curved portions are disposed. 
     The second elastic links  260  are arranged in a circumferential direction so as to constitute a tube. That is, the plurality of second elastic links  260  are disposed centering around the vibration rod  230  in the circumferential direction of the vibration rod  230 , and thus, the plurality of elastic links  260  may form a hollow in a direction of an inner diameter. 
     At this time, in order to appropriately fix the second elastic link  260 , the casing  212  may have a predetermined step height, but the present invention is not limited thereto. 
     As described above, when the second elastic link  260  receives a deformation force in a direction of an inner diameter by a vibration force of the oscillator  300 , the second elastic link  260  may be deformed in the direction of the inner diameter to thereby press the elastic chip  220 , and thus, the elastic chip  220  may deform. 
     The second elastic link  260  according to the current embodiment may be more stably fixed within the casing  212 , and the second curved portions bent in the form of a ring come into contact with the straight portion disposed below the second curved portions. Thus, the second elastic link  260  may be more stably deformed in the direction of the inner diameter due to the deformation force in both lateral directions. Accordingly, the second elastic link  260  may be more stably deformed, and the hydraulic power unit may reliably operate. 
     Hereinafter, an operation of the hydraulic power unit  1  will be described. 
     First, an operation of the amplitude amplification device  200  will be described below. 
     As illustrated in  FIG. 7 , when an external force is applied to the elastic chip  220  from the oscillator  300 , the elastic chip  220  is deformed into a curved shape with a protruding center portion. The elastic chip  220  may be repeatedly deformed and restored to the original shape according to the external force applied from the oscillator  300  disposed below the hydraulic power unit  1 . 
     For example, when the oscillator  300  is deformed, the swell tube  214  is deformed inwards by a deformation force transmitted from the oscillator head  310  to thereby press the elastic chip  220 . Thus, the center portion of the elastic chip  220  is deformed into such a curved shape with a protruding center portion. 
     The vibration of the oscillator  300  and the deformation of the elastic chip  220  take place in a longitudinal direction of the hydraulic power unit  1 . Thus, the capacity of the elastic tube  114  within the hydraulic tube  100  is changed, thereby extruding a fluid filled in the inner hollow  118  within the elastic tube  114  to the outside through the opening  132  which is formed in the connection jig  130 . 
     Meanwhile, the extruded fluid passes through a predetermined path and a fluid chamber. Then, the fluid changes its direction to flow into the above-mentioned outer hollow  116 , which will be described below. 
     Meanwhile, the elastic chip  220  receives a pressing force from the vibration rod  230  and is disposed between the vibration rods  230 , and thus, the elastic chip  220  maintains its flat shape in an initial state where no external force is applied thereto from the oscillator  300 . 
     Meanwhile, as described above, not only one elastic chip  220  but also a plurality of the elastic chips  220  may be stacked on each other. 
     Thus, when seen from a longitudinal direction of the hydraulic power unit  1 , a hole formed in the elastic chip  220  may be wholly or partially covered other of the elastic chips  220 . At this time, as illustrated in  FIG. 6 , the elastic chips  220  may be stacked in such a manner that curved surfaces thereof are curved in the same direction or in a direction in which they face each other, but the present invention is not limited thereto. 
     When the hydraulic power unit  1  according to the present invention and all members that are internally or externally connected thereto are filled with a fluid and sealed, the fluid within the sealed space may be circulated in a desired direction. 
     In order to increase an amount and a force of the fluid which is extruded through the opening  132 , a deformation amount of the oscillator  300  is required to be increased. A method of increasing the deformation amount of the oscillator  300  may be classified into a method of increasing a voltage of electric energy to be applied and a method of mechanically stacking a plurality of piezoelectric elements used as the oscillator  300 . 
     In addition, as described above, the amplitude amplification device  200  is disposed between the oscillator  300  and the hydraulic tube  100 , and thus, an amount of fluid which is extruded and inpoured through an extrusion passage  434  and an amount of fluid which is extruded and inpoured through an inlet may be increased, thereby further increasing the output of the hydraulic power unit  1 . 
     Hereinafter, the hydraulic engine  2  including the hydraulic power unit  1  according to the present invention will be described. 
       FIG. 11  is a diagram illustrating the hydraulic engine  2  including the hydraulic power unit  1  according to the embodiment of the present invention.  FIG. 12  is a diagram illustrating a rear flange  430  of the hydraulic engine  2  according to the embodiment of the present invention.  FIG. 13  is a diagram illustrating a front flange  440  of the hydraulic engine  2  according to the embodiment of the present invention.  FIG. 14  is a diagram illustrating a flow of a working fluid of the hydraulic engine  2  according to the embodiment of the present invention.  FIG. 15  is a diagram illustrating a state where the whole hydraulic force of a working fluid is balanced. 
     The hydraulic engine  2  according to the present invention includes the hydraulic power unit  1 , a housing, a rotor  420  that is rotatably supported within the housing and is provided with a rotor blade  422  on the circumference thereof, a fluid chamber  450  which is disposed within the housing, and a flange. 
     The flange includes the front flange  440  and the rear flange  430 , and a rotor is disposed between the front flange  440  and the rear flange  430 . 
     The rear flange  430  includes a fixation hole  432  for fixing the hydraulic power unit  1 , and an extrusion passage  434 . The extrusion passage  434  is formed so that the rotor blade  422  formed in the rotor and the inner hollow  118  of the hydraulic tube  100  included in the hydraulic power unit  1  communicate with each other. 
     The front flange  440  includes a discharge hole  442  for discharging a fluid which is inpoured through the rotor blade  422 , and the fluid chamber  450  disposed in front of the front flange  440 . 
     The housing is a member constituting an outer shape of the hydraulic engine  2  according to the current embodiment of the present invention. The rotor  420  and a plurality of the hydraulic power units  1  may be disposed within the housing. 
     The rotor  420  is a member which is rotatably disposed within the housing. The rotor  420  includes a plurality of the rotor blades  422  that protrude in a direction of the radius of the rotor  420  with respect to a rotation axis of the rotor  420 . Meanwhile, the rotor  420  may have a predetermined configuration of, for example, a predetermined double helical gear. 
     The output axis  402  may extend from the rotation axis of the rotor  420  within a flange or may be formed integrally with the rotation axis of the rotor  420 . The output axis  402  may be installed so as to protrude to the outside from the housing. 
     Meanwhile, the housing may be divided into an upper housing  410  and a lower housing  412 . A sealing member is disposed between the upper housing  410  and the lower housing  412  so as to prevent the fluid from leaking. 
       FIGS. 12 and 13  illustrate a flange. Referring to  FIGS. 12 and 13 , the flange forms a frame of the hydraulic engine  2  and may keep the hydraulic power unit in a constant position. 
     The flange includes the front flange  440  and the rear flange  430 . The front flange  440  and the rear flange  430  are disposed within the housing, and the rotor  420  is disposed between the front flange  440  and the rear flange  430 . 
     The front flange  440  and the rear flange  430  are formed in the form of a ring. That is, as illustrated in  FIGS. 12 and 13 , the front flange  440  and the rear flange  430  are formed in the form of a ring in which a hollow is formed therein. 
     The hydraulic power unit  1  is fixed to the rear flange  430 . The rear flange  430  includes the predetermined fixation hole  432 . A female screw portion is formed in the fixation hole  432  so as to be coupled with a male screw portion formed in the connection jig  130 . At this time, a plurality of the fixation holes  432  may be formed, and the hydraulic power unit  1  may be fixed to the fixation hole  432 . 
     The extrusion passage  434  is formed in the rear flange  430 , and the extrusion passage  434  is connected to the fixation hole  432 . The extrusion passage  434  is disposed between the rotor  420  and the hydraulic tube  100 . A fluid extruded from the inner hollow  118  within the hydraulic tube  100  may be transmitted to the rotor  420  through the extrusion passage  434 . Preferably, the extrusion passage  434  forms a tilt angle with respect to the rotor blade  422  so that the fluid extruded from the hydraulic tube  100  applies an extrusion force to the rotor blade  422  to thereby rotate the rotor  420 . That is, the fluid extruded through the hydraulic tube  100  applies an extrusion force to the rotor blade  422  to thereby rotate the rotor  420 , thereby generating power. The injection chamber passage  438  is formed in the rear flange  430 . The injection chamber passage  438  is connected to the injection passage  436 . A fluid transmitted from the rotor  420  may be injected into the side through hole  160  through the injection chamber passage  438  and the injection passage  436 . A fluid extruded from the extrusion passage  434  may rotate the rotor  420 . Thereafter, the fluid passes through the discharge hole  442  and be transmitted to the fluid chamber  450 . Thereafter, the fluid changes its direction and passes through the discharge hole  444  and the injection passage  436 . And a fluid may be injected into the side through hole  160  connected to the injection chamber passage  438  and the rear fluid chamber  470 . 
     The discharge hole  442  is formed in the front flange  440 , and the fluid chamber  450  is formed in front of the front flange  440 . The fluid extruded through the extrusion passage  434  applies an extrusion force to the rotor blade  422  to thereby rotate the rotor  420 . Then, the fluid passes through the fluid chamber  450  and changes its direction to thereby rotate the rotational rotor  420  again. Similarly to the extrusion passage  434 , the discharge hole  442  may have a tilt angle. 
     At this time, the discharge hole  442  formed in the front flange  440  and the side through hole  160  formed in the metal tube  112  of the hydraulic tube  100  are connected to each other through the fluid chamber  450 , and thus, a flowing path along which the fluid flows is formed. That is, the discharge hole  442  formed in the front flange  440  is configured in such a manner that an extrusion fluid, which flows through the side through hole  160  formed in the metal tube  112  to thereby rotate the rotor  420 , applies rotatory power to the rotational rotor  420  through the fluid chamber  450  and a fluid movement path so as to flow into the outer hollow  116  through the side through hole  160 . Thus, the fluid extruded from the inner hollow  118  may rotate the rotor  420  and then flow into the outer hollow  116 . Therefore, the fluid may be extruded to the inside or outside of the hydraulic tube  100 , and the extrusion and inpouring of the fluid with respect to the hydraulic tube  100  may be bidirectionally performed at the same time, thereby rotating the rotor  420  in one direction. Meanwhile, the predetermined fluid chamber  450  having the working fluid gathered therein may be included in the fluid movement path of the outer hollow  116 . 
     Preferably, hydraulic power units  1  in an even number are installed within the hydraulic engine  2  so as to be associated with each other, and thus, the hydraulic power units  1  may replenish a balance force. 
     That is, as illustrated in  FIG. 14 , a first hydraulic power unit  1 A and a second hydraulic power unit  1 B may be disposed in one hydraulic engine  2 . At this time, each hydraulic power unit  1  may be disposed in a circumferential direction of the rotor  420 . A working fluid extruded from the first hydraulic power unit  1 A may rotate the rotor  420 , may be discharged to the fluid chamber  450  through the discharge hole  442 , may change its direction through the fluid chamber  450 , may rotate another rotor through another discharge hole  444 , and then may be drawn into the first hydraulic power unit  1 A through the side through hole  160 , the injection chamber passage  438  and the injection passage  436 . 
     The above-mentioned operation may be inversely repeated. 
     In addition, a complementary operation between fluids is performed between the first hydraulic power unit  1 A and the second hydraulic power unit  1 B through the fluid chamber  450  and the injection chamber passage  438 , and rotatory power of the rotor may be constantly maintained during such a complementary operation between fluids. 
     As illustrated in  FIG. 13 , a force applied to a fluid may be constantly balanced by a complementary operation so that a strong forward driving force of the oscillator  300  of the even-numbered hydraulic power units  1 A and a weak backward driving force of the oscillator  300  of the even-numbered hydraulic power unit  1 B are combined with each other through a forward driving fluid that is extruded from the fluid chamber  450  and the injection chamber passage  438 . 
     Meanwhile, a predetermined accumulator  460  may be provided in a fluid movement path between the discharge hole  442  and the side through hole  160 . The accumulator  460  adjusts a flow rate of a fluid. The accumulator  460  may be configured to replenish a fluid when a flow rate of the fluid changes due to temperature, pressure, or loss of the fluid or to appropriately adjust a flow rate of the fluid. 
     The hydraulic power unit  1  extrudes and inpours a fluid in a tangential direction of one surface of the rotor  420  toward a plurality of the rotor blades  422  that are disposed in the rotor  420 . 
     Preferably, the hydraulic engine  2  may further include an operational module  500  that drives the hydraulic power unit  1 , adjusts a number of rotations and a torque of the rotor, and includes a secondary battery as a driving power source. 
     In the hydraulic engine  2  according to the present invention, an inverse piezoelectric effect is mainly used by the ceramic oscillator  300  that is included in the hydraulic power unit  1  constituting the hydraulic engine  2 . Based on the inverse piezoelectric effect, a displacement and strong force occur in the ceramic oscillator  300  according to a driving voltage, a driving frequency, and stiffness (rigidity) of the ceramic oscillator  300 . Since a working fluid to be extruded strongly presses the rotor blade  422  due to the displacement and strong force, a torque for rotating the rotor  420  may be extremely increased. In particular, a flow rate of the working fluid may be arbitrarily changed by adjusting a time to apply a driving signal. 
     Meanwhile, the hydraulic engine  2  according to the present invention does not require additional power or fuel except for power of a secondary battery included in a driving module, which is used to generate a signal to be applied to the ceramic oscillator  300  included in the hydraulic power unit  1 . Accordingly, the hydraulic engine  2  may be continuously driven within a lifespan range of the ceramic oscillator  300  and a secondary battery for supplying power for applying a driving signal to the ceramic oscillator  300  without supplying additional power or fuel. 
     In addition, the hydraulic engine  2  according to the present invention includes an amplitude amplification device, and thus, a vibration amplitude according to the oscillator  300  may be further amplified. Accordingly, the hydraulic engine  2  may have a larger output. 
     As described above, according to the one or more of the above embodiments of the present invention, in a hydraulic engine, an inverse piezoelectric effect is mainly used in a ceramic oscillator included in a hydraulic power unit of the hydraulic engine. Based on the inverse piezoelectric effect, a displacement and strong force occur in the ceramic oscillator according to a driving voltage, a driving frequency, and stiffness (rigidity) of the ceramic oscillator. Since a working fluid to be extruded strongly presses a rotor blade due to the displacement and strong force, a torque for rotating a rotor may be extremely increased. In particular, a flow rate of the working fluid may be arbitrarily changed by adjusting a time to apply a driving signal. 
     Meanwhile, the hydraulic engine according to the present invention does not require additional power or fuel except for power of a secondary battery included in a driving module, which is used to generate a signal to be applied to the ceramic oscillator included in the hydraulic power unit. Accordingly, the hydraulic engine may be continuously driven within a lifespan range of the ceramic oscillator and a secondary battery for supplying power for applying a driving signal to the ceramic oscillator without supplying additional power or fuel. 
     In addition, the hydraulic engine according to the present invention includes an amplitude amplification device, and thus, a vibration amplitude according to an oscillator may be further amplified. Accordingly, the hydraulic engine may have a larger output. 
     It should be understood that the exemplary embodiments described therein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments. 
     While one or more embodiments of the present invention have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.