KR20020079122A - Oil pressure type kick-board - Google Patents

Abstract

PURPOSE: An oil-hydraulic kickboard is provided to make a user enjoy a kickboard as a leisure sports instrument and as a safe transportation device by making operation convenient and long-distance travel possible. CONSTITUTION: A handle part(4) is installed vertically and connected to the front end of a frame(2). The handle rotates leftward and rightward. A front wheel(5) is connected to the lower portion of the handle part. A rotating shaft(6) is installed in the rear end portion of the frame. A first and a second rear wheels(7,8) are axially installed on the rotating shaft. A first and a second footsteps(30,40) are connected to the frame, while the front ends are rotatable. A first and a second oil-hydraulic pressure generating units connected to the footsteps and the frame, and generate oil-hydraulic pressure. An oil-hydraulic motor drives the rotating shaft by receiving the oil-hydraulic pressure generated from the oil-hydraulic pressure generating units. A fluid control unit controls the flow of oil between the oil-hydraulic pressure generating units and the oil-hydraulic motor. If a user alternately steps on the footsteps, oil-hydraulic pressure is generated. A kickboard is driven by the oil-hydraulic pressure.

Description

Hydraulic Kickboard {Oil pressure type kick-board}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic kickboard, wherein a wheel is installed at a front and a back, and a handle is formed, so that a person can hold a handle and step on a footrest to generate hydraulic pressure, thereby enabling long-distance travel with a small force.

1 is a kickboard according to the prior art.

In the conventional kickboard, the front wheel 201 and the rear wheel 202 are provided at upper and lower sides of the footrest 203, and the handle 204 is placed at the front end of the footrest 203, and on the footrest 203. Put one foot and then drive the ground with the other foot, while holding the handle 204 by hand to switch direction.

However, the conventional kickboard has a problem in that it takes not only a lot of force when driving for a long time, and thus it is not easy to control the speed arbitrarily because the person advances the ground with one foot.

In addition, the conventional kickboard has a problem that the rear wheel 202 is formed in one, the sense of stability is inhibited.

The present invention has been made in order to solve the above problems of the prior art, it can be used for leisure sports that anyone can easily ride because it is driven by generating a hydraulic pressure using a foot, as well as a long distance with a small force The object of the present invention is to provide a hydraulic kickboard that can be used as a safe transport means because it is possible to travel and operate easily.

1 is a perspective view of a kickboard according to the prior art,

2 is a perspective view of a hydraulic kickboard according to the present invention;

3 is a plan view of a hydraulic kickboard according to the present invention;

4 is a side view of the hydraulic kickboard according to the present invention;

5 is a rear view of the hydraulic kickboard according to the present invention;

6 is a diagram illustrating A-A according to FIG. 3,

7 is a detail view of B according to FIG. 4,

FIG. 8 is a view illustrating B′-B ′ according to FIG. 3.

9 is a view illustrating C-C according to FIG. 5;

FIG. 10 is a diagram illustrating a D-D according to FIG. 5;

11 is a view showing the fluid control means of the hydraulic kickboard according to the invention,

12 is a view illustrating E-E according to FIG. 5;

FIG. 13 is a view illustrating an F-F according to FIG. 5.

<Explanation of symbols on main parts of the drawings>

2: frame 4: handle part

6 rotation axis 7: first rear wheel

10: first hinge portion 30: the first footrest

33: protrusion 50: first hydraulic pressure generating means

52: first cylinder 56: first operating rod

70: hydraulic motor 72: vane

73: cam ring 78: motor shaft

78a: gear 80: clutch means

82a: groove 83: clutch ball

85 gear 91 91: first euro

95: first port 100: braking means

101: working cam 102: first brake shoe

106: brake drum 110: differential means

Hydraulic kickboard according to the present invention for solving the above problems is a frame, a handle portion which is connected to the front end of the frame and erect in an upward direction so as to rotate left and right, the front wheel connected to the lower end of the handle portion, the rear end of the frame A rotation shaft installed at the first and second rear wheels arranged on the rotation shaft, the first and second scaffolds positioned at upper left and right sides of the frame and connected to the frame so that the front end is rotatable, and the first and second scaffoldings. First and second hydraulic pressure generating means connected to the frame to generate hydraulic pressure by the rotation of the first and second scaffolds, and a hydraulic motor for driving the rotary shaft by receiving hydraulic pressure from the first and second hydraulic pressure generating means; And fluid control means for controlling the flow of oil between the first and second hydraulic pressure generating means and the hydraulic motor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Hydraulic kickboard according to the invention is shown in Figures 2 to 4, 11,

The frame 2, the handle portion 4 connected to the distal end of the frame 2 and erected upwardly so as to rotate left and right, the front wheel 5 connected to the lower end of the handle portion 4, and the frame ( 2) the rotary shaft 6 provided at the rear end, the first and second rear wheels 7 and 8 arranged on the rotary shaft 6, and the upper and lower left and right sides of the frame 2, The first and second footrests 30 and 40, the first and second footholds 30 and 40 connected so that their ends are rotatable by the first and second hinge parts 10 and 20 installed on the first and second hinge parts 10 and 20. And first and second hydraulic pressure generating means (50, 60) connected to the respective first and second hydraulic pressure generating means (50, 60) to generate hydraulic pressure by the rotation of the first and second scaffolding (30, 40), respectively. A hydraulic control unit for controlling the flow of oil between the hydraulic motor 70 for driving the rotary shaft 6, the first and second hydraulic pressure generating means (50, 60) and the hydraulic motor (70) by receiving hydraulic pressure from Means 90 and the motor of the hydraulic motor 70 The rotational force of the motor shaft 78 to the rotation shaft 6 and the ratio of the rotational speed of the rotation shaft 6 and the motor shaft 78 is greater than or equal to a predetermined value. It consists of a clutch means (80) for releasing the connection of the motor shaft (78) and the rotary shaft (6).

In addition, the present invention comprises a rotation means (18, 28) for pushing the first and second scaffold (30, 40) to be rotated upward.

In addition, the present invention includes a braking means 100 to decelerate or brake the kickboard during driving as shown in FIG. 5, and a differential means 110 to be easily steered by the rotation wheel of the rear wheel. It is configured by.

As shown in FIG. 3, the frame 2 includes left and right frames 2a and 2b, a center frame 2c positioned at the center of the left and right frames 2a and 2b, and the left and right sides. It is formed of a front end frame 2d connected to the front ends of the frames 2a and 2b, and a lower end frame 2e connected to the lower ends of the left and right frames 2a and 2b.

As shown in FIGS. 3, 6, and 8, the first scaffold 30 is formed at the top of the scaffold 30 and has two protrusions 33 and 34 formed with holes 33H and 34H in the center, respectively. ), A locking rod (36) formed at a lower end of the top of the footrest (30) so that a member for pushing the end of the footrest (30) is rotated upward, and formed on a bottom surface of the footrest (30). It consists of a pin 38 for connecting one end of the first hydraulic pressure generating means 50 to be rotatable.

In addition, the upper side of the scaffold 30 is formed with a long groove 39a in the longitudinal direction and a half-moon-shaped protruding wall 39 for preventing the foot from sliding forward in the long groove 39a is formed by the bolt (B1) It is fastened to the long groove 39a.

The second scaffold 40 is also configured like the first scaffold 30, and thus detailed description thereof will be omitted.

As shown in FIGS. 3 and 6, the first hinge part 10 protrudes in the upward direction to the left and right sides of the flat plate 11 and the left and right sides of the front end frame 2d, respectively. Partitions 12 and 13 and pins 15 fitted to be pivotable to the partitions 12 and 13 and fixed to holes 33H and 34H of the first scaffold 30.

As shown in FIGS. 3 and 6, the first pivoting means 18 is wound around the pin 15 so that one end of the first scaffold 30 is pivoted upward. It is caught by the locking rod 36 of the 30, the other end is composed of a coil spring (18) that is caught on the plate 11 of the hinge portion.

The second hinge portion 20 and the second pivot means 28 are also configured like the first hinge portion 10 and the first pivot means 18 so that the second scaffold 40 has the frame 2. Since it is rotatably installed in, detailed description thereof will be omitted here.

As shown in FIGS. 7 and 8, the first hydraulic pressure generating means 50 has a lower end connected to a central portion of the left frame 2a and communicates with the hydraulic motor 70. Has a first cylinder 52 formed at the lower end portion 52b, a first piston 55 installed inside the first cylinder 52 and moving to generate hydraulic pressure, and one end of which is connected to the first piston 55. It is fixed and the other end is composed of a first operating rod 56 which is rotatably connected to the first scaffold (30).

The first cylinder 52 has a shaft 2S formed at a lower end portion 52b with a circumferentially penetrating hole 52H inserted into a protrusion bar 2a 'protruding inwardly of the left frame 2a. The first operation rod 56 has a circumferentially penetrating hole 56b formed at an upper end thereof, and is rotatably fitted to a pin 38 formed in the first scaffold 30. .

The first actuating rod 56 has a passage 56a formed so that the upper air of the first piston 55 escapes through the air hole 56c formed at the upper end of the first actuating rod 56.

Since the second hydraulic pressure generating means 60 is configured like the first hydraulic pressure generating means 50 and is installed on the second scaffold 40 and the right frame 2b, detailed description thereof will be omitted.

As shown in FIGS. 5 and 9, the hydraulic motor 70 includes a casing 74 having the suction port 75 and the discharge port 77 formed on the same side thereof, and a rotor having a plurality of grooves 71a radially formed therein. 71, a vane 72 inserted into the plurality of grooves 71a so as to be movable, a spring 72a inserted into the groove 71a to push the vanes 72 outward, and the casing ( Cam ring 73 is built in the 74 and the vane 72 is in close contact with the rotor 71 is fixedly fixed to the rotor 71, the gear 78a is connected at one end to the rotational force of the rotor 71 to the clutch means ( And a motor shaft 78 for transmitting to 80.

As shown in FIGS. 5 and 10, the clutch means 80 has a gear tooth 85 that is engaged with the gear 78a on the outer circumference thereof, and the rotation shaft 6 is formed at the center thereof and one side on the inner circumferential surface thereof. It is composed of a gear 81 having a plurality of grooves 82 gradually enlarged, and a clutch ball 83 inserted into the plurality of grooves 82.

Meanwhile, as shown in FIG. 5, the first rear wheel 7 is connected to the rotary shaft 6 and the differential means 110, and the second rear wheel 8 is fixed to the rotary shaft 6. .

5 and 13, the differential means 110 is inserted in the center so that the rotation shaft 6 is rotatably arranged in the center and fixed to the center of the first rear wheel (7) and expanded to one side on the inner peripheral surface It consists of a cylindrical case 111 is formed with a groove 112, and the clutch ball 113 is inserted into the plurality of grooves 112 to transmit or block the rotational force of the rotating shaft 6 to the case 111. .

As shown in FIG. 11, the fluid control means 90 is connected to a discharge port 77 of the hydraulic motor by a conduit U7 to temporarily store oil discharged from the hydraulic motor 70. And, the hydraulic generating means (50, 60) and the hydraulic motor 70 and the tank 99 is connected to the pipeline to supply oil from the hydraulic generating means (50, 60) to the hydraulic motor (70) or the tank And a fluid controller 98 in which a flow path for supplying oil from the hydraulic pressure generating means 50, 60 is formed.

In the fluid controller 98, when the occupant presses the first scaffold 30, the first scaffold 30 is lowered and the first piston 55 is moved forward of the first cylinder 52. The first flow path 91 for supplying the oil filled in the cylinder 52 to the hydraulic motor 70 through the conduits U1, U2, and U3, and the foot holding the first footrest 30 are raised. When the end of the scaffold 30 is rotated upward by the first coil spring 18, the first piston 55 is moved to the rear of the first cylinder 52 to pipe the oil filled in the tank 99 A second passage 92 allowing the first cylinder 52 to be supplied to the first cylinder 52 through the U4 and U1, and the second footrest 40 descends when the occupant presses the second footrest 40 to the second piston ( As the 65 is moved to the front of the second cylinder 62, the third passage 93 for supplying the oil filled in the second cylinder 62 to the hydraulic motor 70 through the conduits (U5, U6, U3) ) And the above When the end of the footrest 40 is rotated upward by the second coil spring 28 by raising the foot holding the second foothold 40, the second piston 65 is rearward of the second cylinder 62. It is composed of a fourth flow path (94) for moving the oil filled in the tank 99 to the second cylinder 62 through the pipe (U4, U5).

Meanwhile, the first, second, third and fourth check valves C1, C2, C3, and C4 are provided in the first, second, third and fourth flow paths 91, 92, 93, and 94 to move the oil in only one direction. The first and second flow paths 91 and 92 communicate with the conduit U1 by the first port 95, and the third and fourth flow paths 93 and 94 connect to the second port 96. It communicates with the pipeline U5, and the second and fourth flow paths 92 and 94 communicate with the pipeline U4 by the third port 97.

As shown in FIGS. 2, 5, and 12, the braking means 100 includes a brake lever 9 installed on the handle part 4, and a rod connected to the brake lever 9 by a wire 9a. 101a, an elliptical cam 101 connected to the rod 101a, one end of the cam 101 is in contact with the other, and the other end of the back plate 107 is rotatably installed by the hinge shaft 104. The semi-circular first and second brake shoes 102 and 103 extended by the operation of the cam 101 and the outer circumferential surfaces of the first and second brake shoes 102 and 103 are attached to the first and second brake shoes 102 and 103. The brake drum 106 is braked when the first and second linings 102a and 103a protecting the 103 and the first and second linings 102a and 103a are fastened to the rotation shaft 6 by bolts B3. And a return spring 105 for returning the positions of the first and second brake shoes 102 and 103.

Looking at the operation of the hydraulic kickboard according to the present invention configured as described above are as follows.

As shown in FIGS. 2, 3, and 7, the end of the first and second scaffolds 30 and 40 is pivoted upward by the coil springs 18 and 28. When the end of the first footrest 30 is rotated downward by pressing the foot 30, the first actuating rod 56 installed to be rotatable by the pin 38 installed at the lower end of the first footrest 30 is provided. As the front of the first cylinder 52 is moved, the first piston 55 discharges the oil introduced into the first cylinder 52 through the passage 52a of the first cylinder.

As shown in FIG. 11, the oil discharged from the first cylinder 52 may have a first port 95, a first flow path 91, and a pipe U2 (U3) of the conduit U1 and the fluid controller 98. It is supplied to the hydraulic motor (70) through.

The oil flowing through the suction port 75 of the hydraulic motor rotates the rotor 71 while passing through the space between the casing 74 and the rotor 71 as shown in FIGS. It is discharged to the tank 99 through U7.

When the rotor 71 is rotated, as shown in FIG. 5, the motor shaft 78 installed in the rotor 71 is rotated. When the motor shaft 78 is rotated, the motor shaft 78 and the motor shaft 78 are rotated. The gear 81 of the clutch means, which is bitten by the connected gear 78a, rotates together. At this time, the clutch ball 83 shown in FIG. 10 is located in the non-expansion part of the right side of the groove 82 as the gear 81 is rotated, thereby transmitting the rotational force of the gear 81 to the rotation shaft 6. The first and second rear wheels 7 and 8 are driven.

In the above, the first rear wheel 7 connected to the rotation shaft 6 and the differential means 110 is located at a non-expansion portion of the clutch ball 113 illustrated in FIG. 13, which is the right side of the groove 112 formed in the case 111. Thus, the rotational force of the rotary shaft 6 is transmitted to the first rear wheel 7.

As described above, after the end of the first footrest 30 is rotated downward to generate hydraulic pressure, when the occupant lifts the foot to remove the pressing force of the first footrest 30, the first footrest 30 is The negative pressure is generated in the first cylinder 52 because the first operating rod 56 is moved backward while being rotated upward by the restoring force of the first coil spring 18.

When a negative pressure is generated in the first cylinder 52, the oil stored in the tank 99 is transferred to the third port 97, the second flow path 92, and the first port of the conduit U4 and the fluid controller 98. 95) and is supplied into the first cylinder 52 through the conduit U1.

When the end of the first footrest 30 is rotated upward, the occupant presses the second footrest 40 with his foot to cause the end of the second footrest 40 to rotate downward, as shown in FIG. 11. As the second operation rod 66 is moved forward of the second cylinder 62, the second piston 65 passes the oil introduced into the second cylinder 62. Discharge through 62a).

The oil discharged from the second cylinder (62) is the hydraulic motor (70) through the second port (96) and the third passage (93) and the passage (U6) (U3) of the conduit (U5) and the fluid controller 98. Is supplied.

Since the hydraulic pressure is generated by the first hydraulic pressure generating means 50 and the first and second rear wheels 7 and 8 are driven, the hydraulic pressure is generated by the second hydraulic pressure generating means. 8), detailed description thereof will be omitted.

On the other hand, after the end of the second footrest 40 is rotated downward to generate hydraulic pressure, when the occupant lifts the foot to remove the pressing force of the second footrest 40, the second footrest 40 The negative pressure is generated in the second cylinder 62 because the second operating rod 66 is moved backward while being rotated upward by the restoring force of the second coil spring 28.

When a negative pressure is generated in the second cylinder 62, the oil stored in the tank 99 is transferred to the third port 97, the fourth flow path 94, and the second port of the conduit U4 and the fluid controller 98. 96 and the inside of the second cylinder 62 through the conduit U5.

Thereafter, when the occupant alternately presses the first footrest 30 and the second footrest 40, hydraulic pressure is continuously generated and the kickboard continues to run.

In addition, even when the occupant stops the operation of generating the hydraulic pressure while driving, the rotation of the motor shaft 78 of the hydraulic motor 70 stops the rotation shaft 6 is rotated by inertial force, so the clutch ball of the clutch means 80 ( 83 is located on the left side of the groove 82 to allow idle rotation of the rotation shaft 6, and the kickboard continues to run.

In addition, when the kickboard is to be decelerated or braked while driving the kickboard according to the present invention, when the passenger pulls the brake lever 9 and rotates the rod 101a as shown in FIGS. As the cam 101 connected to the 101a is rotated, the first and second brake shoes 102 and 103 which are in contact with the cam 101 are pushed left and right to rotate together with the rotation shaft 6. In close contact with the rotary shaft 6, the driving of the kickboard is decelerated or stopped.

On the other hand, when the brake lever 9 is released, the operation cam 101 is rotated and returned, and the first and second brake shoes 102 and 103 are also returned by the return spring 105 to rotate the rotation shaft 6. Brake is released.

In addition, when the occupant intends to turn right, when the occupant turns the handle part 4 shown in FIG. 2 to the right, the friction force of the first rear wheel 7 on which the differential means 110 is installed becomes greater than the second rear wheel 8. Since the rear wheel 7 is rotated slower than the rotation shaft 6, the clutch ball 113 of the differential means is moved to the left side, which is an extension of the groove 112 formed in the differential means 110, and the clutch ball 113. If the rotational force of the rotary shaft 6 is not transmitted to the first rear wheel 7 and the first rear wheel 7 is idling when positioned in the extension part, the rotation difference between the first rear wheel 7 and the second rear wheel 8 is It's smooth and right.

In addition, when the occupant intends to turn left, when the occupant turns the handle part 4 shown in FIG. 2 to the left, the frictional force of the second rear wheel 8 becomes greater than that of the first rear wheel 7, and thus the first rear wheel 7 is rotated. Since it rotates faster than (6), the clutch ball 113 of the differential means is moved to the left side, which is an extension of the groove 112 formed in the differential means 110, and when the clutch ball 113 is located in the extension portion, the rotating shaft Since the rotational force of (6) is not transmitted to the first rear wheel 7 and the first rear wheel 7 is idling, a rotational difference between the first rear wheel 7 and the second rear wheel 8 is generated and smoothly turned to the left.

The hydraulic kickboard of the present invention configured as described above can be easily ridden by the passengers by pressing the first and second footboards alternately using the foot, and the kickboard is driven by the hydraulic pressure generated by the first and second hydraulic pressure generating means. Not only can be used for leisure sports, it can be used as a safe transport means is possible to travel long distance with a small force and convenient operation.

Claims (18)

A frame; A handle part connected to the front end of the frame and erected in an upward direction so as to be able to rotate left and right; A front wheel connected to a lower end of the handle part; A rotating shaft provided at a rear end of the frame; A rear wheel arranged on the rotating shaft; A scaffold connected to the front end of the frame so as to be rotatable vertically; Hydraulic pressure generating means for generating hydraulic pressure by rotating the scaffold; Hydraulic kickboard, characterized in that consisting of a hydraulic motor for driving the rotary shaft receives the hydraulic pressure from the hydraulic generating means. A frame; A handle part connected to the front end of the frame and erected in an upward direction so as to be able to rotate left and right; A front wheel connected to a lower end of the handle part; A rotating shaft provided at a rear end of the frame; First and second rear wheels arranged on the rotary shaft; First and second scaffolds positioned on upper left and right sides of the frame and connected to the frame so that a tip thereof is rotatable; First and second hydraulic pressure generating means connected to the first and second scaffolding and the frame, respectively, to generate hydraulic pressure by the rotation of the first and second scaffolding; A hydraulic motor for driving the rotary shaft by receiving hydraulic pressure from the first and second hydraulic pressure generating means; Hydraulic kickboard, characterized in that the fluid control means for controlling the flow of oil between the first, second hydraulic pressure generating means and the hydraulic motor. The method of claim 2, The hydraulic kickboard is a hydraulic kickboard, characterized in that the rotating means for rotating the first and second footrest is installed. The method of claim 2, The front end of the first and second scaffold is a hydraulic kickboard, characterized in that rotatably fitted to the pin installed between the partition wall of the flat plate fixed to the frame. The method of claim 4, wherein In the front end portions of the first and second scaffold to be fitted to the pin, two projections each having a hole fitted to be rotatably fitted to the pin are formed at the center thereof, and a locking rod is formed at the rear of the projection, and the first and second scaffoldings are formed. The rotating means for rotating the upper side, respectively, is formed by a coil spring, one end of the coil spring is caught by the edge of the flat plate, the other end of the coil spring hydraulic kickboard, characterized in that the engaging rod. The method of claim 2, Hydraulic kickboard, characterized in that the upper side of the first, the second foot plate is fastened so that the protruding wall is prevented from sliding forward. The method of claim 2, Each of the first and second hydraulic pressure generating means includes a cylinder having one end rotatably connected to the frame and having a passage communicating with the hydraulic motor; A piston installed inside the cylinder; A hydraulic kickboard, characterized in that the one end is connected to the piston, the other end is composed of a working rod rotatably connected to the first and second scaffold. The method of claim 7, wherein The actuating rod is a hydraulic kickboard, characterized in that the passage is formed so that the air of the cylinder escapes through the air hole formed in the upper end of the actuating rod. The method of claim 2, The hydraulic motor includes a casing formed with a suction port and a discharge port; A rotor rotatably installed in the casing and having a plurality of grooves radially formed therein; A vane inserted into the plurality of grooves to rotate the rotor when oil is introduced; A cam ring installed inside the casing and in contact with the vane; Hydraulic kickboard, characterized in that consisting of a motor shaft arranged in the rotor. The method of claim 2, A clutch means connected between the motor shaft and the rotation shaft of the hydraulic motor to transmit the rotational force of the motor shaft to the rotation shaft, and disconnecting the motor shaft and the rotation shaft when the ratio of the rotation speed of the rotation shaft and the motor shaft is greater than or equal to a predetermined value. Hydraulic kickboard, characterized in that configured. The method of claim 10, The clutch means includes a gear formed in the motor shaft and a gear teeth engaged with the gear shaft, the gear is arranged to be fixed to the rotating shaft in the center thereof, and is disposed radially on an inner circumferential surface and has a plurality of grooves gradually expanded to one side; Hydraulic kickboard, characterized in that consisting of a clutch ball inserted into the plurality of grooves. The method of claim 2, The fluid control means is connected to the hydraulic motor tank for temporarily storing the oil discharged from the hydraulic motor; Connected to the first and second hydraulic pressure generating means, the hydraulic motor and the tank to supply oil to the hydraulic motor from the first and second hydraulic pressure generating means or to supply the oil to the first and second hydraulic pressure generating means from the tank. Hydraulic kickboard, characterized in that consisting of a fluid controller formed with a flow path The method of claim 12, The fluid controller includes a first flow path for supplying the oil filled in the first cylinder of the first hydraulic pressure generating means to the hydraulic motor when the occupant presses the first foot with the foot, and when the first foot is rotated upward from the tank. A second passage through which oil is supplied to the first cylinder, and a third passage through which a passenger presses the second foot plate to supply oil filled in the second cylinder of the second hydraulic pressure generating means to the hydraulic motor; And a fourth flow path configured to supply oil from the tank to the second cylinder when the second scaffold is pivoted upward. The method of claim 13, The first, second, third and fourth check valves are installed in the first, second, third and fourth flow paths to move oil only in one direction, respectively, and the first and second flow paths communicate with the first hydraulic pressure generating means. A hydraulic kickboard, comprising: a first port, a second port in which the third and fourth flow paths communicate with the second hydraulic pressure generating means, and a third port in which the second and fourth flow paths communicate with the tank. The method of claim 2, And a braking means connected to the rotary shaft to decelerate or stop the hydraulic kickboard during driving. The method of claim 15, The braking means includes a brake lever installed at the handle portion; A rod connected to the brake lever by a wire; An elliptical cam connected to the rod; First and second brake shoes which have one end in contact with the cam and the other end of which is rotatably installed by a hinge shaft and is enlarged by operation of the cam; A brake drum fastened to the rotation shaft and braked when the first and second brake shoes are in close contact with each other; Hydraulic kickboard, characterized in that consisting of a return spring to return the position of the first and second brake shoes. The method of claim 2, And a differential means installed between one of the first and second rear wheels and the rotating shaft to steer the vehicle by steering of the first and second rear wheels. The method of claim 17, The differential means has a cylindrical case having a plurality of grooves formed on the inner circumferential surface and a plurality of grooves formed on the inner circumferential surface thereof so that the rotating shaft is rotatable, and a clutch ball inserted into the plurality of grooves to transmit or block the rotational force of the rotating shaft to the case. Hydraulic kickboard, characterized in that consisting of.