WO2001050019A1

WO2001050019A1 - Electric car equipped with hydraulic lift power turbine

Info

Publication number: WO2001050019A1
Application number: PCT/KR2000/001568
Authority: WO
Inventors: Changhwan Cho; Hyunkyung Cho
Original assignee: Changhwan Cho; Hyunkyung Cho
Priority date: 1999-12-30
Filing date: 2000-12-30
Publication date: 2001-07-12
Also published as: AU2409201A; KR20010059931A

Abstract

The object of this invention is to provide an electric car, which uses a hydraulic lift power turbine and converts physical power of the turbine into electric power for rotating the wheels of the car. The hydraulic lift power turbine includes a seesaw mechanism (210) having a horizontal bar (60) supported by a vertical column unit (40) such that the bar pivots about the hinged joint to form a seasaw action while generating hydraulic lift power. A plurality of hydraulic lift power pumps (50, 50-1) are each hinged to the horizontal bar and the vertical column unit at its opposite ends to form a rectangular pump arrangement. An actuating unit (220) reciprocates the opposite ends of the horizontal bar (60) upward and downward relative to the central axis of the vertical column unit (40). A turbine unit (140) is rotated in response to highly pressurized oil discharged from the hydraulic lift power pumps.

Description

ELECTRIC CAR EQUIPPED WITH HYDRAULIC LIFT POWER TURBINE

TECHNICAL FIELD

The present invention relates, in general, to an electric car equipped with a hydraulic lift power turbine and, more particularly, to an electric car having a hydraulic lift power turbine cooperating with a seesaw or lever mechanism including a fulcrum, a force application point and a weighted point, with a plurality of hydraulic lift power pumps mounted to the lever of the seesaw or lever mechanism and repeatedly moving the mechanism to accomplish a seesaw action while outputting highly pressurized oil to a turbine unit, thus allowing the turbine unit to be rotated to generate desired rotating force, the rotating force from the turbine unit being used for generating desired electricity usable as the power source of the electric car.

BACKGROUND ART

As well known to those skilled in the art, a conventional car uses a reciprocating engine, or an internal combustion engine having a plurality of pistons. In the internal combustion engine, the pistons produce a reciprocating motion, which is converted into a rotating motion for rotating the wheels of the car. Such internal combustion engines use fossil fuel, such as gasoline or light oil, as their energy sources.

In recent years, electric cars have been proposed and used for some limited applications. In the electric cars, a battery-operated motor is used in place of the conventional internal combustion engines. That is, the motor of a conventional electric car is operated by electric power of a battery, and rotates the wheel of the car.

The internal combustion engines, using fossil fuel such as gasoline or light oil as their energy sources, are problematic in that the fossil fuel is a limited natural resource, and so the engines cannot be usable when people cannot obtain such fossil fuel from the earth. Therefore, the internal combustion engines force people to maximize the energy efficiency of the fossil fuel energy source for saving the limited energy and to develop a substitute energy source for the fossil fuel energy. Another problem experienced in the internal combustion engines resides in that they undesirably produce a variety of harmful contaminants, causing air pollution, from their exhaust gases.

The conventional electric cars using batteries are problematic in that they must be equipped with large capacity rechargeable batteries capable of charging a great amount of electric energy for a long-distance movement of the cars. However, such large capacity rechargeable batteries have an excessive volume and an excessive weight making the cars undesirably enlarged in their volumes and weights.

DISCLOSURE OF THE INVENTION

Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide an electric car, which uses a hydraulic lift power turbine and converts the physical power or mechanical power of the turbine into electric power for rotating the wheels, thus being free from a conventional internal combustion engine or a conventional fuel tank.

Another object of the present invention is to provide an electric car, which uses a hydraulic lift power turbine and does not produce any harmful exhaust gases, different from the conventional internal combustion engines, thus being free from causing air pollution, and which minimizes its weight, thus remarkably improving energy efficiency.

In order to accomplish the above object, the present invention provides an electric car, which is equipped with a hydraulic lift power turbine designed to be operated through a seesaw and lever theory, and which converts the hydraulic energy produced from a hydraulic lift power pump into mechanical energy transmitted to the wheel axle through a power transmission mechanism including a reduction gear unit.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

Fig. 1 is a view, showing the theory of lever action used in the present invention; Fig. 2 is a perspective view, showing the construction of a generator fabricated with a hydraulic lift power turbine designed by the inventor of this invention and applied to KIPO for allowance of patent;

Fig. 3 is a view, showing an operation of the generator of Fig. 2; Fig. 4 is a view, showing the construction of an electric car equipped with a hydraulic lift power turbine in accordance with the primary embodiment of the present invention;

Fig. 5 is a block diagram, showing a hydraulic circuit for the electric car of this invention, including both a first highly pressurized oil collector and a second highly pressurized oil collector; Fig. 6 is a view, showing the power transmission mechanism of an electric car equipped with a hydraulic lift power turbine in accordance with a second embodiment of the present invention, and

Fig 7 is a block diagram, showing the power transmission mechanism of an electric car equipped with a hydraulic lift power turbine in accordance with a third embodiment of the present invention

BEST MODE FOR CARRYING OUT THE INVENTION

Reference now should be made to the drawings, in which the same reference numerals are used throughout the different drawings to designate the same or similar components

Fig 1 is a view, showing the theory of lever action used in the present invention Fig 2 is a perspective view, showing the construction of a generator fabricated with a hydraulic lift power turbine designed by the inventor of this invention and applied to KIPO for allowance of patent Fig 3 is a view, showing an operation of the generator of Fig 2 Fig 4 is a view, showing the construction of an electric car equipped with a hydraulic lift power turbine in accordance with the primary embodiment of the present invention Fig 5 is a block diagram, showing a hydraulic circuit for the electric car of this invention, including both a first highly pressurized oil collector and a second highly pressurized oil collector Fig 6 is a view, showing the power transmission mechanism of an electric car equipped with a hydraulic lift power turbine in accordance with another embodiment of the present invention Fig 7 is a block diagram, showing the power transmission mechanism of an electric car equipped with a hydraulic lift power turbine in accordance with a third embodiment of the present invention

The operational theory of a hydraulic lift power turbine will be described herein below prior to the description of the electric car of this invention The theory of lever action used in the present invention is expressed in

Fig 1 When a hydraulic lift power motor is connected to the force application point of the lever of Fig 1, and repeatedly moves the force application point of the lever upward and downward to rotate the rigid lever about the fulcrum, it is possible to generate large power at the weighted point by an application of small force at the force application point That is, the theory of lever action will be expressed by the following expression

FL = F'L' (1)

Wherein, F is the force applied at the force application point, L is the distance from the force application point to the fulcrum, F' is the force generated at the weighted point, and L' is the distance between the weighted point and the fulcrum

As will be noted from the above expression (1), the multiplication of F and L is equal to the multiplication of F' and L' Therefore, when L and F are set to 10m and 1 ton in the above lever mechanism, the force F', acting at the weighted point of L' set to lm, becomes 10 tons In such a case, the turbine is hydraulically rotated by oil under pressure of 10 tons output from a hydraulic lift power pump

In the present invention, the technical term "lift power" in a seesaw or lever structure having a fulcrum A and two force concerning points of distances L and L' with forces P and P' acting at the two points is defined as power applied to the force application point

For example, the torque T of a motor of 3 Hp becomes 119 36 Kg-cm when the motor is rotated at a speed of 1800 rpm When the rotating speed of the motor is reduced by a reduction gear unit having a reduction ratio of 60 1, the rotating speed and torque of the motor become about 30 rpm and 7,162 Kg-cm, respectively Therefore, the torque is increased by 60 times

When the rotating speed of the motor of 3 Hp is reduced by a reduction gear unit having a reduction ratio of 60 1, the rotating speed of the motor becomes about 30 rpm In such a case, the pulling force of the motor has to be first calculated. The force acting at the point B', defined by ten times of the point B in distance, is calculated by the following expression (2). In the seesaw or lever structure, the fulcrum is defined as "A" and the ratio of distances L and L' from the fulcrum A to the two force concerning points is set to 5 : 0.5. Hps = P-v/75 - P-rw/75 (2)

In the expression (2), P = 75-Hps/rw, and w = 3.14 rad/s. The force P to be calculated will be thus expressed by the expression, P = 75x3 / 5x3.14. Therefore, the force P applied at the force application point of the lever mechanism by the motor of 3 Hps is calculated to 14.33 kgf. When the force P of 14.33 kgf is applied at the force application point having the distance of L (= 5 m), a force P' of 143.3 kgf, which is calculated by ten times of the applied force P of 14.33 kgf, acts at the other point having the distance of L' (= 0.5 m). It is thus noted that the force of 143.3 kgf acting at the point of L' is larger than the applied force of 14. 33 kgf by 10 times since the ratio of distances L and L' from the fulcrum A to the two force concerning points is set to

5 : 0.5.

Fig. 2 is a perspective view, showing the construction of a generator fabricated with a hydraulic lift power turbine designed by the inventor of this invention and applied to KIPO (Korean Patent Application No. 99-55,000). Fig. 3 is a view, showing an operation of the generator of Fig. 2. As shown in the drawings, the generator comprises a seesaw mechanism 210. This seesaw mechanism 210 includes a horizontal bar 60, which is supported by a vertical column unit 40 at a hinged joint such that the bar 60 pivots about the hinged joint to form a seesaw action while generating hydraulic lift power. The generator also includes an actuating unit 220, which reciprocates the opposite ends of the horizontal bar 60 upward and downward relative to the central axis of the vertical column unit 40. The generator further includes an oil feeding unit and a highly pressurized oil collecting unit. The oil feeding unit is used for feeding highly pressurized oil from an oil tank to a plurality of hydraulic lift power pumps 50 and 50-1, while the highly pressurized oil collecting unit is used for collecting highly pressurized oil from the pump 50 and 50-1, and feeding the oil to a turbine unit, thus allowing the turbine unit to rotate while generating desired electric power. In the generator, the vertical column unit 40 comprises two vertical columns, with two upper connecting shafts 40-1 and 40-3 extending between the two columns at the upper portion of the unit 40, and two lower connecting shafts 40-2 and 40-4 extending between the two columns at the lower portion. A hinge shaft 120 extends between the two columns at the middle portion of the unit 40, and holds the horizontal bar 60 such that the bar 60 pivots around the hinge shaft

120.

In addition, eight hydraulic lift power pumps 50 and 50-1, each comprising a hydraulic cylinder actuator, are hinged to the two upper connecting shafts 40-1 and 40-3 at their cylinder ends at a plurality of first hinged joints 190, with the ends of their piston rods hinged to the horizontal bar 60 at a plurality of second hinged joints 190. In the same manner, eight hydraulic lift power pumps 50 and 50-1 are hinged to the two lower connecting shafts 40-2 and 40-4 at their cylinder ends and to the horizontal bar 60 at the ends of their piston rods. The hydraulic lift power pumps 50 and 50-1 are set on the seesaw mechanism 210 while forming a rectangular arrangement.

Fig. 3 particularly shows the operation and mechanism of the generator of Fig. 2 when the generator is installed on a support surface 30.

The oil feeding unit of the generator feeds oil under high pressure to the hydraulic lift power pumps 50 and 50-1, and comprises a plurality of oil supply hoses 170-1, an oil pump 230, a first manifold pipe unit 90-2, and an oil tank 240.

The hydraulic lift power pumps 50 and 50-1 are connected to the manifold pipe unit 90-2 through the hoses 170-1, while the oil pump 230 is mounted to the oil supply line extending from the oil tank 240 to the manifold pipe unit 90-2. The oil pump 230 highly pressurizes the oil from the oil tank 240 to quickly feed the highly pressurized oil to the hydraulic lift power pumps 50 and 50-1 through the manifold pipe unit 90-2.

On the other hand, the highly pressurized oil collecting unit 500 is used for collecting highly pressurized oil output from the hydraulic lift power pumps 50 and 50-1, and comprises a plurality of oil collecting hoses 170-2, a second manifold pipe unit 90-1, and a pressure regulator 360 used for regulating pressure of oil fed to the turbine unit (not shown).

Since the hydraulic lift power pumps 50 and 50-1 output a large amount of pressurized oil during an operation, it is necessary to collect the oil from the pumps 50 and 50-1 using the manifold pipe unit 90-1 connected to the lift power pumps 50 and 50-1 through the hoses 170-2. Thereafter, the oil collecting unit 500 strongly discharges the pressurized oil to the turbine unit while regulating the oil pressure, thus rotating the turbine unit to allow the turbine unit to generate electric power.

The actuating unit 220 reciprocates the opposite ends of the horizontal bar 60 upward and downward relative to the central axis of the vertical column unit 40. In order to fabricate the actuating unit 220, a connector is formed at each end of the horizontal bar 60 of the seesaw mechanism 210 and holds an end of a cable 160. That is, the opposite ends of the cable 160 are connected to the opposite ends of the horizontal bar 60. A motor 150 is set on the support surface 30 at a positioned around the base of the vertical column unit 40. A pulley 290 is connected to the output shaft of the motor 150 through a clutch 250 and a rotating direction control unit 270, with the cable 160 wound around the pulley 290 so as to move the ends of the horizontal bar 60 upward and downward to accomplish a seesawing action.

In a detailed description, the cable 160, connected to the opposite ends of the horizontal bar 60 of the seesaw mechanism 210 at its opposite ends, is wound around the pulley 260 at its middle portion The pulley 260 is fixed to the shaft of the rotating direction control unit 270 This rotating direction control unit 270 is controlled by the clutch 250 so as to be rotatable in either direction by the rotating force of the motor 150 That is, the clutch 250 transmits the rotating force of the motor 150 to the rotating direction control unit 270 while controlling the direction of the rotating force, thus making the pulley 260 rotated in either direction. In the present invention, an electromagnetic clutch or an automatic shifting clutch is preferably used as the clutch 250

The generator of this invention also includes a controller, which is used for controlling the operation of the generator The controller (not shown) controls the operation of the generator in response to signals output from a plurality of sensors, which are mounted to the ends of the horizontal bar 60, in addition to predetermined portions of two cushion units 110. During an operation of the generator, the sensors sense the rotated angles of the horizontal bar 60, and output predetermined signals to the controller, thus allowing the controller to output a control signal to the clutch 250. In response to the control signal from the controller, the clutch 250 controls the rotating direction of the direction control unit 270 to change the rotating direction of the pulley 290.

The construction and operation of an electric car equipped with a generator having such a hydraulic lift power turbine in accordance with the preferred embodiments of the present invention will be described herein below.

Figs. 4 and 5 show the construction of an electric car equipped with a hydraulic lift power turbine in accordance with the primary embodiment of the present invention As shown in the drawings, the vertical column unit 40 of the above-mentioned seesaw mechanism 210 is fixed to opposite side parts of a frame

400 of the car chassis at its opposite ends through a welding process. A guide roller 300 is provided at each end of the horizontal bar 60, while two guide rails 320 are provided on the opposite ends of the frame 400 for guiding a movement of the two rollers 300 along the ends of the frame 400 while maintaining a precise rotating angle of the bar 60, in addition to reducing an undesired movement or vibration of the bar 60 during seesaw action of the bar 60.

The vertical column unit 40 and the horizontal bar 60 are connected together using two types of hydraulic lift power pumps 50 and 50-1. In such a case, the first lift power pumps 50 having a long stroke are arranged at the outside, while the second lift power pumps 50-1 having a short stroke are arranged at the inside. Of the two types of hydraulic lift power pumps, the second lift power pumps 50-1, having the short stroke and arranged at the inside, are used for preventing any operational error due to the long stroke of the first lift power pumps

50 during a seesawing action of the mechanism 210.

The highly pressurized oil collecting unit 500 comprises a first highly pressurized oil collector 90 and a second highly pressurized oil collector 260. The first oil collector 90 is used for collecting highly pressurized oil from the outside lift power pumps 50, while the second oil collector 260 is used for collecting highly pressurized oil from the inside lift power pumps 50-1. A check valve 280 is mounted on the oil line extending between the first and second oil collectors 90 and 260, thus preventing an undesired returning of oil to the first oil collector 90 at the initial stage of an operation. The actuating unit 220, comprising the motor 150, the clutch 250 and the rotating direction control unit 270, is installed on the frame 400 at a position around the vertical column unit 40. A control roller 380 is mounted to the frame 400 at an appropriate position, with the cable 160 connected to the opposite ends of the horizontal bar 60 of the seesaw mechanism 210 at its opposite ends and wound around the control roller 380 at its middle portion.

The electric car also includes an energy supply source unit for supplying electric power to the drive motor 150. This energy supply source unit comprises a rechargeable battery 310 and a battery charging generator 340. The battery 310 is used for supplying electric power to the drive motor 150 of the actuating unit 220, while the battery charging generator 340 is installed at the wheel axle (not shown) and is used for charging the battery 310 with electricity.

The battery 310 of the energy supply source unit is automatically charged with electricity at the start of the car in a conventional manner, and so it reliably supplies electric power to the motor 150 from the initial stage of the start of the car.

In an operation of the electric car, the highly pressurized oil collecting unit 500 collects the highly pressurized oil from the outside and inside lift power pumps 50 and 50-1, and feeds the highly pressurized oil to the hydraulic lift power turbine unit while controlling the pressure of the oil, thus rotating the turbine unit and allowing the turbine unit to generate electric energy. The electric energy from the turbine unit is accumulated in a main electric changer 410 prior to supplying electricity to the main drive motor of the electric car, thus rotating the main drive motor. The rotating force of the main drive motor is transmitted to the wheel axle so as to rotate the wheels and move the car. Such a power transmission of the rotating force of the main drive motor to the wheel axle of the electric car of this invention remains the same as that of conventional electric cars, and further explanation is thus not deemed necessary. Fig. 6 shows an electric car equipped with a hydraulic lift power turbine in accordance with the second embodiment of the present invention. In the second embodiment of this invention, the general shape of the electric car remains the same a that of the primary embodiment, but the highly pressurized oil of the hydraulic lift power pumps 50 is fed to the axle of the car through a power transmission mechanism different from that of the primary embodiment.

That is, the oil used for rotating the lift power turbine is pressurized again by an oil pump prior to being fed to a turbine, which rotates the axle of the car, under the control of a control valve. The rotating action of the axle is controlled by a reduction gear unit, and so it is possible to control the rotating speed of the axle

The electric car of this embodiment includes a plurality of blades, which are regularly formed around the rotating shaft 70 of the turbine unit 140 The electric car also has a power transmission unit, which includes a reduction gear unit 330 This reduction gear unit 330 is positioned between the rotating shaft 70 of the turbine unit and the wheel axle 350, and controls the rotating force transmitted from the shaft 70 to the wheel axle 350

The electric car also includes an energy supply source unit for supplying electric power to the drive motor 150 This energy supply source unit comprises a rechargeable battery 310 and a battery charging generator 340 The battery charging generator 340 is installed at the wheel axle and is used for charging the battery 310. The battery 310 supplies electric power to the drive motor 150 of the actuating unit 220. When the car according to the second embodiment is stopped or moved at a low speed, the idle operational force of the hydraulic lift power pumps is supplied to the generator, thus compensating for the energy consumption of the battery.

The operational effect of the electric car according to the second embodiment will be described herein below.

The motor 150 is activated by the electric power from the battery 310 of the energy supply source unit, and transmits its rotating force to the rotating direction control unit 270 through the clutch 250 Therefore, the cable 160, wound around the pulley 290, is pulled so as to move the ends of the horizontal bar 60 upward and downward to accomplish a seesawing action. During the operation, the sensors, mounted to the predetermined portions of the two cushion units 110 having springs, sense the rotated angles of the horizontal bar 60, and output signals to the controller, thus allowing the controller to output a control signal to the clutch 250 In response to the control signal from the controller, the clutch 250 controls the rotating direction of the direction control unit 270 to change the rotating direction of the pulley 290

The hydraulic lift power pumps 50 and 50-1 output a large amount of pressurized oil during a seesaw action of the horizontal bar 60 The oil from the pumps 50 and 50-1 is collected to the first and second oil collectors of the oil collecting unit through a plurality of hoses Thereafter, the oil collecting unit strongly discharges the pressurized oil to the turbine unit while regulating the oil pressure, thus rotating the turbine unit to allow the turbine unit to generate electric power

The reduction gear unit 330 is connected to the rotating shaft 70 of the turbine unit, and transmits the rotating force of the shaft 70 to the wheel axle 350 while controlling the rotating speed, thus moving the electric car

In such a case, the reduction gear unit 330 changes the speed ratio in accordance with the rotating speed, and so it is possible to control the rotating speed of the rotating force transmitted from the shaft 70 of the turbine unit to the wheel axle 350

The battery charging generator 340 is installed at the wheel axle, and charges the battery 310 with electricity using the rotating action of the wheels Fig 6 shows the electric car equipped with the hydraulic lift power turbine according to the second embodiment of this invention In this embodiment, the highly pressurized oil of the hydraulic lift power pumps 50 is fed to the axle of the car through the power transmission mechanism different from that of the primary embodiment The hydraulic lift power pumps included in the seesaw mechanism comprise two types of pumps- the first lift power pumps 50 having a long stroke and arranged at the outside, and the second lift power pumps 50-1 having a short stroke and arranged at the inside The second lift power pumps 50-1, having the short stroke and arranged at the inside, are used for preventing any operational error due to the long stroke of the first lift power pumps 50 during a seesawing action of the mechanism 210.

In the highly pressurized oil collecting unit 500, the first oil collector 90 is used for collecting the highly pressurized oil from the outside lift power pumps 50, while the second oil collector 260 is used for collecting the highly pressurized oil from the inside lift power pumps 50-1. Therefore, it is possible to minimize the operational error of the seesaw mechanism.

In the electric car, the power transmission unit includes the reduction gear unit 330, which is positioned between the rotating shaft 70 of the turbine unit 140 and the wheel axle 350, and controls the rotating force transmitted from the shaft 70 to the wheel axle 350. The reduction gear unit 330 of the power transmission unit converts the hydraulic power of the turbine unit 140 into a rotating power, and transmits the rotating power to the axle 350. Fig. 7 shows an electric car equipped with a hydraulic lift power turbine according to the third embodiment of this invention. In this embodiment, a generator 510 is connected to the rotating shaft of a first turbine unit 140 and generates electricity. The electricity is applied to the shaft 70 of the turbine unit 140 and a hydraulic pump 370, thus pressurizing the remaining part of the oil again. A pressure control valve 460 is provided for controlling the pressure of the oil pumped by the hydraulic pump 370. The pressurized oil output from the pump 370 is fed to a second turbine unit 390 while being controlled in its pressure by the pressure control valve 460, thus rotating the second turbine unit 390.

That is, the pressure control valve 460 controls the pressure of oil from the hydraulic pump 370, while the second turbine unit 390 is rotated by the pressurized oil from the control valve 460.

In a brief description, an oil pump 370, a pressure control valve 460, a second turbine unit 390 and a reduction gear unit 330 are set between the rotating shaft 70 of the first turbine unit 140 and the axle 350 of the car. The reduction gear unit 330 transmits the rotating force of the second turbine unit 390 to the axle 350 while controlling the rotating speed of the rotating force.

When the rotating force of the second turbine unit 390 is transmitted to the axle 350 through the reduction gear unit 330, the rear wheels are rotated to move the car.

In this embodiment, the electric car also includes an energy supply source unit for supplying electric power to the drive motor 150 of the actuating unit 220. This energy supply source unit comprises a rechargeable battery and a battery charging generator 340. The battery is used for supplying electric power to the drive motor 150, while the battery charging generator 340 is installed at the wheel axle and is used for charging the battery with electricity. The drive motor 150 may be operated hydraulically.

In the electric car of the third embodiment, a plurality of blades are regularly formed around the rotating shaft 70 of the first turbine unit 140. The first turbine unit 140 thus generates desired energy. Electricity is supplied to the rotating shaft 70 and the hydraulic pump 370 to pressurize the remaining oil again. The pressurized oil from the pump 370 is controlled by the pressure control valve 460 in its pressure, and is fed to the second turbine unit 390, and so the second turbine unit 390 is rotated while generating rotating force that will be transmitted to the axle 350 through the reduction gear unit 330.

When the car according to the third embodiment is stopped or moved at a low speed, the idle operational force of the hydraulic pump 370 is supplied to the generator, thus compensating for the energy consumption of the battery.

INDUSTRIAL APPLICABILITY

As described above, the present invention provides an electric car, which uses a plurality of hydraulic lift power turbines and converts the physical power of a turbine into electric power for rotating the wheel axle, thus being free from a conventional internal combustion engine or a conventional fuel tank. The electric car of this invention uses the hydraulic lift power turbine, and does not produce any harmful exhaust gases, different from the conventional internal combustion engines, thus being free from causing air pollution. This electric car preferably minimizes its weight, thus remarkably improving its energy efficiency.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

1 An electric car, comprising a hydraulic lift power generator equipped with a hydraulic lift power turbine, said turbine including a seesaw mechanism including a horizontal bar supported by a vertical column unit at a hinged joint such that the bar pivots about the hinged joint to form a seesaw action while generating hydraulic lift power, a plurality of hydraulic lift power pumps each hinged to said horizontal bar and said vertical column unit at its opposite ends such that the hydraulic lift power pumps are set on the seesaw mechanism while forming a rectangular arrangement; an actuating unit reciprocating opposite ends of the horizontal bar of the seesaw mechanism upward and downward relative to a central axis of the vertical column unit; and a turbine unit rotated in response to highly pressurized oil discharged from the hydraulic lift power pumps, whereby said generator, having the hydraulic lift power turbine, is installed within the car, and hydraulic energy generated from the hydraulic lift power pumps is supplied to a power transmission unit including a reduction gear unit, thus rotating wheels of the car.

2. The electric car according to claim 1, wherein said vertical column unit of the seesaw mechanism is mounted to opposite side parts of a frame of a car chassis at its opposite ends through a welding process, with a guide roller provided at each end of said horizontal bar, and two guide rails provided on opposite ends of said frame of the car chassis for guiding a movement of the guide rollers along the ends of the frame while maintaining a precise rotating angle of the bar, in addition to reducing an undesired movement or vibration of the bar during a seesaw action of the bar; said actuating unit comprises a motor, a clutch and a rotating direction control unit, said actuating unit being installed on the frame of the car chassis at a position around the vertical column unit, with a control roller mounted to the frame at an appropriate position, and a cable connected to the opposite ends of the horizontal bar of the seesaw mechanism at its opposite ends and wound around the control roller at its middle portion; an energy supply source unit is used for supplying electric power to said motor, said energy supply source unit comprising a rechargeable battery and a battery charging generator, said battery being used for supplying electric power to the motor of the actuating unit, and said battery charging generator being used for charging the battery with electricity using a rotating force of the wheels of the car; and the power transmission unit includes the reduction gear unit, said reduction gear unit being positioned between a rotating shaft of said turbine unit and a wheel axle, and controlling the rotating force that is converted from the hydraulic energy of the turbine unit and is transmitted from the shaft of the turbine unit to the wheel axle.

3. The electric car according to claim 1 or 2, wherein the power transmission unit comprises a plurality of blades formed around the rotating shaft of a first turbine unit, a hydraulic pump connected to the rotating shaft of the first turbine unit, a pressure control valve used for controlling the pressure of pressurized oil discharged from said hydraulic pump, a second turbine unit rotated by the pressurized oil from the pressure control valve, and the reduction gear unit used for controlling the speed of the rotating force transmitted from a rotating shaft of said second turbine unit to the wheel axle; and the energy supply source unit comprises the rechargeable battery and the battery charging generator, said battery being used for supplying electric power to the motor of the actuating unit, and said battery charging generator being used for charging the battery with electricity using a rotating force of the wheels of the car, said energy supply source unit being operated such that idle operational force of the hydraulic lift power pumps is supplied to the generator to compensate for energy consumption of the battery when the car is stopped or moved at a low speed.