JP2010120486A - Water bicycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water bicycle having excellent propulsion and provided with a clutch structure capable of maintaining the forward-reverse state and the neutral state of a hull. <P>SOLUTION: A propulsion driving device 100 provided on a hull 1 has a first rotary shaft 101, a second rotary shaft 104, and a third rotary shaft 110. The first rotary shaft 101 and the second rotary shaft 104 are connected to each other via a chain 107 as a primary amplifying mechanism of the number of rotation, or the like, and the second rotary shaft 104 and the third rotary shaft 110 are connected to each other via a first speed change gear 112 and a second speed change gear 113 as secondary amplifying mechanisms of the number of rotation. A rotational direction changing device 200 is a clutch structure, which couples the rotation of the third rotary shaft 110 with the propulsion driving shaft coupled with a screw 5 selectively in the forward-reverse direction or the neutral state. A crank bar 108 and a stepping pedal 109 having the same structure as a driving mechanism of a bicycle are provided on the first rotary shaft 101 of the propulsion driving device 100. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a water bicycle, and more particularly to a water bicycle excellent in propulsive force.

  Water bicycles that have been able to propel the water by human power have been known for a long time. Some prior arts attempt to reduce the pedaling force by adding an auxiliary device that increases the propulsion driving force. As an example, the propulsion screw 11 (the symbol of the publication, hereinafter this The same as the above), and the force of stepping on the pedal 8 can be adjusted by changing the elevation angle of the hydrofoil 9 and 10 provided before and after the fuselage (Patent Document 1), paddle instead of screw A wheel (pulling waterwheel) propulsion mechanism 37 is employed, and the pedal 7 is driven to drive the paddle 10 to propel the machine body (Patent Document 2), and the drive unit of the propulsion screw 10 is electrically assisted. A device provided with the device 3 (Patent Document 3) is known.

  In the invention described in Patent Document 1, the mounting angles of the hydrofoil 9 and 10 provided before and after the floats 1 and 1 (water bicycle) are variably provided, and the propulsion speed is changed by selecting the mounting angle of the hydrofoil. It can be done. However, the adjustment of the mounting angle of the hydrofoils 9 and 10 is not only inconvenient that must be done while the floats 1 and 1 are stopped, but the adjustment angle is in the range of 2 ° or 3 ° according to the embodiment. However, there is a problem that the adjustment work takes time because the adjustment work is performed by changing bolts and nuts.

  In addition, the invention described in Patent Document 2 employs a paddle wheel (feathering waterwheel) propulsion mechanism 37, but in order to generate the propulsive force of a water bicycle by the force with which the paddle 10 scratches water, Requires leg strength with excellent muscular strength and sustainability, and has high utility value for competition, but is slightly unsuitable for leisure use. In addition, the invention described in Patent Document 3 is provided with an electric assist device used in a bicycle in a driving unit that generates driving force by human power, and has an advantage that it can be driven easily when worn. There is a problem that the electric assist device needs to be charged, and when the aircraft is not used, the aircraft is moored on a river or a lake, so that the electric assist device may be insufficiently managed.

Japanese Utility Model Publication No.7-111498 Japanese Patent Laid-Open No. 10-258797 Japanese Patent Laid-Open No. 2001-21989

  By the way, in order to solve the above-mentioned problems of the prior art, the present inventor proposed a water bicycle excellent in propulsive force according to Japanese Patent Application No. 2007-299031 (filing date: November 19, 2007).

  The device shown in FIG. 9 is an invention proposed by the inventor of the present application, and includes a pair of foot pedals 1 that are pivotably mounted on a hull 100 with a base end portion pivoted thereon, and a pivot portion of the foot lever 1. The first drive shaft 2 that rotates in conjunction with the screw 4, the screw 4 that is connected to the second drive shaft 3 that rotates in conjunction with the first drive shaft 2, and the handle operation of the handle 5, A rudder plate 6 that changes the traveling direction is provided. A rolling roller 207 pivotally attached to a flywheel 206 provided between the foot levers 1 is slidably received in a long hole 208 provided in the foot lever 1 and formed in a direction parallel to the longitudinal direction. In this case, when one of the levers reaches the upper position, the other lever reaches the lower position. Further, the foot lever 1 is coupled to the first drive shaft 2 through a drive structure of a rotational drive force generation mechanism 11 provided at the pivot portion, and the first drive shaft 2 is connected to the rotation direction switching mechanism 12. It is coupled to the second drive shaft 3. The swinging motion of the foot lever 1 is transmitted as a rotational motion to the first drive shaft 2, and the rotation of the first drive shaft 2 is transmitted as a rotational motion to the screw 4 via the second drive shaft 3. .

  The above invention of the prior application obtains a propulsive force by the operation of alternately depressing the foot lever, and has the advantage of being able to drive even with a weak leg force, but in order to increase the propulsive force, a large-diameter fly A wheel 206 and a long foot lever 1 were required.

  Here, the longer stepping lever means that the reciprocating distance of the stepping pedal 203 is inevitably longer, and for those who are short in height, the stepping motion of the stepping lever 1 is not easy and lacks entertainment. was there. For this reason, a water bicycle provided with a drive device that is easier to drive than the prior invention has been desired.

  An object of the present invention is a further improvement of the prior art and the prior invention proposed by the inventor of the present application, and has a clutch structure that has excellent propulsive force and can maintain the forward / reverse and stop states of the hull. To provide a water bicycle.

  The first of the solving means is that the propulsion drive device provided in the hull has a first rotating shaft, a second rotating shaft, and a third rotating shaft, and the first rotating shaft and the second rotating shaft. The rotation shaft is connected via a primary amplification mechanism of the rotational speed, the second rotational shaft and the third rotational shaft are connected via a secondary amplification mechanism of the rotational speed, and the third rotational shaft is rotated. It is connected to a propulsion drive shaft that rotates a screw via a direction switching device, and the primary amplification mechanism of the rotational speed is a chain or the like attached to a chain gear, and the secondary amplification mechanism of the rotational speed is the above The first transmission gear provided on the second rotation shaft and the second transmission gear provided on the third rotation shaft are meshed, and the rotation direction switching device has a clutch structure, and the third transmission gear. And the propulsion drive shaft is provided so as to be freely rotatable. The first and second clutch cylinders, the second clutch cylinder and the propulsion drive shaft that are integrally rotatable with each other and slidable in the axial direction. By moving the first and second clutch receiving cylinders in the axial direction, the rotation of the third rotating shaft can be selected in the forward / reverse direction and the neutral state with respect to the propulsion driving shaft, A crank rod and a foot pedal having the same structure as the bicycle drive mechanism are provided on the first rotating shaft of the propulsion driving device, and the hull is propelled by pedaling motion of the foot pedal.

  The second of the solving means is the first of the solving means, wherein the secondary amplifying mechanism of the rotational speed in the propulsion drive device is provided on the first transmission chain gear and the third rotating shaft provided on the second rotating shaft. The second transmission chain gear is connected by a chain or a timing belt.

  According to a third aspect of the solution means, in the first of the solution means, a secondary amplification mechanism for the rotational speed of the propulsion drive device is provided on the first speed change friction disk and the third rotation shaft provided on the second rotation shaft. A second shift friction disc, wherein a chevron-shaped engagement portion formed at the peripheral portion of the first shift friction disc is pressed against a valley engagement portion formed at the peripheral portion of the second shift friction disc. It is characterized by that.

  According to the first aspect of the present invention, since the propulsion drive device for propelling the hull has a primary amplification mechanism and a secondary amplification mechanism for the rotational speed, the propulsion force of the hull can be easily generated even with a small force. This makes driving easier and more stable. Moreover, the rotation direction switching device provided between the propulsion drive shaft that drives the screw to rotate and the propulsion drive device has a clutch structure, and the clutch structure can be selected to be neutral to maintain the hull forward / reverse and stopped. Therefore, the hull can be moved forward and backward, as well as the hull can be maintained in a stopped state, so that it is possible to row a bicycle without advancing the hull on the water, and it can be used as a beauty tool. Yes.

  Since the secondary amplification mechanism for transmitting the rotation generated by the pedal rowing motion to the third rotation shaft is a chain hung on the transmission chain gear, the installation position of the rotation shaft of the transmission chain gear is appropriately selected. As a result, a large gear ratio can be obtained, thereby enabling high-speed operation.

  According to the third aspect of the present invention, since the secondary amplifying mechanism for transmitting the rotation generated by the pedaling motion to the third rotating shaft presses the transmission friction discs together, the transmission friction disc functions as a friction clutch. The start can be done smoothly.

First Embodiment FIGS. 1 to 6 show a first embodiment, FIG. 1 schematically shows a water bicycle according to the present invention, A is a side view of the whole, B is a plan view thereof, 2 is a side view showing the first propulsion drive device, FIG. 3 is a plan view thereof, FIG. 4 is a plan view showing an operation switching structure for switching forward / reverse operation of the hull, FIG. 5 is a side view thereof, and FIG. It is a top view which shows the steering structure of a hull.

  In this specification, regarding the installation position of each member, when referring to “front position or rear position” or simply “front or rear”, the front or rear position with respect to the propulsion direction of the hull 1 is shown.

  1 to 3, the water bicycle according to the present invention has a boat body 1 having a boat shape, and a pipe frame body 2 similar to the pipe structure of the bicycle is provided on the bottom of the boat. The pipe 2a and the rear pipe 2b are constituted by a horizontal pipe 2c. The front pipe 2a is provided with a handle 3, and the rear pipe 2b is provided with a saddle 4. Furthermore, a screw 5 is provided at both stern rear corners of the hull 1, and a rudder plate 6 is provided at the center of the stern rear. The screw 5 is connected to a propulsion drive device 100, which will be described later, and is driven to rotate. The rudder plate 6 is connected to and driven by a propulsion direction switching lever 7 provided on the horizontal pipe 2c.

  The propulsion drive device 100 described above has a primary amplification mechanism and a secondary amplification mechanism of the rotational speed, and the primary amplification mechanism is provided on the first rotation shaft 101 and the second rotation shaft 104. The primary amplifying mechanism of the propulsion drive device 100 is provided with a first rotating shaft 101 mounted on a first bearing 102 at a position slightly forward of the saddle 4, and the first rotating shaft 101 has a first chain. A gear 103 is provided. In addition, a second rotary shaft 104 is mounted on the second bearing 105 at a position rearward of the first rotary shaft 101 in parallel to the axial direction, and the second chain gear is connected to the second rotary shaft 104. 106 is provided.

  The first chain gear 103 and the second chain gear 106 are both provided as a pair, and are provided on both sides of the first and second bearings 102 and 105. A chain 107 is attached to the chain gear 103 and the second chain gear 106 (see FIG. 3). Here, the first chain gear 103 is on the driving side and the second chain gear 106 is on the driven side, and the diameter of the first chain gear 103 is larger than that of the second chain gear 106. Is formed.

  In the embodiment, the chain 107 as the rotation transmitting means can be replaced with a timing belt.

  Further, a crank rod 108 is provided on the first rotating shaft 101 described above, and a foot pedal 109 is provided on the crank rod 108.

  The secondary amplifying mechanism of the propulsion driving device 100 includes a third rotating shaft 110 at a rear position adjacent to the second rotating shaft 104 provided on the second rotating shaft 104 and the third rotating shaft 110. Is provided in parallel with the axial direction on the third bearing 111 and meshes with the first transmission gear 112 provided on the second rotary shaft 104 on the third rotary shaft 110. A gear 113 is provided. The first transmission gear 112 and the second transmission gear 113 serve as transmission means. Here, the diameter of the first transmission gear 112 is larger than that of the second transmission gear 113. . As a result, the rotational force generated by the stepping motion of the foot pedal 109 can be shifted to high speed and transmitted to the third rotating shaft 110.

  Further, the third rotating shaft 110 protrudes from the second transmission gear 113 and has a tip portion pivoted on the fourth bearing 114, and the rotation is switched to the portion protruding from the fourth bearing 114. A direction switching device 200 is provided. By operating the propulsion direction switching lever 7, the screw 5 rotates in the forward and reverse directions via the rotation direction switching device 200.

  Details of the rotation direction switching device 200 will be described with reference to FIGS. 4 and 5. In these drawings, the rotation direction switching device 200 is provided on both ends of the third rotation shaft 110 and is provided on the propulsion drive shaft 201 that rotates in a direction orthogonal to the longitudinal direction of the third rotation shaft 110. Clutch structure. Note that the description of the rotation direction switching device 200 will be made only for one device with reference to FIGS. 4 and 5.

  The main bevel gear 202 is integrally provided on the third rotating shaft 110 via a key or the like, and the first bevel gear 203 and the symmetrical bevel gear 203 are arranged on the center line of the third rotating shaft 110. The second bevel gear 204 is meshed in a constantly meshed state. Here, the first and second bevel gears 203 and 204 are provided on the fourth rotating shaft 201 so as to be freely rotatable. The first and second bevel gears 203 and 204 rotate the propulsion drive shaft 201 in the forward and reverse directions by interposing a clutch structure between the propulsion drive shaft 201.

  The first and second sub bevel gears 203 and 204 are coupled to the first and second sub bevel gears 202 and 203 and are free to rotate with respect to the propulsion drive shaft 201. A cylinder 205 and a second clutch cylinder 206 are provided. The propulsion drive shaft 201 is provided with a first clutch receiving cylinder 207 and a second clutch receiving cylinder 208 adjacent to the first and second clutch cylinders 205 and 206. The first and second clutch receiving cylinders 207 and 208 can rotate integrally with the propulsion drive shaft 201 via a key or the like, but can slide in the axial direction.

  The first and second clutch cylinders 205 and 206 and the first and second clutch receiving cylinders 207 and 208 are formed with clutch teeth on opposite end surfaces. The first and second clutch cylinders 205 and 206 are provided with clutch teeth 209 and 210, and the first and second clutch receiver cylinders 207 and 208 are provided with clutch receiver teeth 211 and 212.

  The first and second clutch receiving cylinders 207 and 208 are provided with moving ring bodies 213 and 214 at the body, and these moving ring bodies 213 and 214 are coupled by a clutch connecting rod 215. Yes. Here, by moving the clutch connecting rod 215 in the axial direction, the first and second clutch receiving cylinders 207 and 208 are in a pattern in which one of them is engaged and the other is released (during clutch operation). ) And both of them can select a pattern for releasing (when the clutch is neutral).

  The engagement of the clutch shown in FIG. 4 indicates a neutral time when the first and second clutch receiving cylinders 207, 208 are not engaged with any of the clutch cylinders 205, 206, and the clutch shown in FIG. Since the first and second clutch cylinders 205 are engaged with the first clutch receiving cylinder 207, the rotation of the third rotating shaft 110 is caused by the first clutch receiving cylinder 205 from the first and second clutch cylinders 205. It is transmitted to the fourth rotating shaft 201 through the cylinder 207. In the figure, reference numerals 216 and 217 denote bearings that support the propulsion drive shaft 201.

  The propulsion drive shaft 201 extends from one bearing 217 through a universal joint 218 and is connected to the screw 5 provided at the rear of the hull 1. The clutch connection rod 215 to which the moving rings 213 and 214 are connected is connected to a flexible shaft 219 serving as an output shaft of the direction switching lever 7 provided in the pipe frame assembly 2. Is used to turn the clutch on and off. The flexible shaft 219 is accommodated in the outer cylinder 220 and reciprocates by operating the direction switching lever 7.

  The clutch connecting rod 215 can be provided with a coil spring (not shown) on the opposite side to which the flexible shaft 219 is connected. In this case, the clutch can be more reliably engaged.

  In FIG. 6, the rudder plate 6 is provided at the stern of the hull 1 so as to be rotatable by a rudder shaft 230. A rudder wire 232 is attached to a rudder operation rod 231 fixed to the rudder shaft 230. The turning direction of the rudder plate 6 is changed by the operation described above. The steering wire 232 is drawn from the rudder operation rod 231 in the left-right direction in plan view, and is coupled to a wire operation rod 234 provided on the handle 3 via pulleys 233 provided at the four corners of the hull 1. .

  Since the steering wire 232 is rotated to the left or right in conjunction with the rotation of the handle 3, the steering plate 6 is rotated by the steering wire 232 pulled along with the rotation of the handle 3, and the hull. The traveling direction of 1 is made variable.

  The first embodiment is configured as described above. The driver sits on the saddle 4 and steps on the foot pedal 109 in the manner of riding a bicycle to rotate the first rotating shaft 101. The rotation of the first rotation shaft 101 transmits the rotation in the order of the first chain gear 103, the chain 107, and the second chain gear 106, and the second rotation shaft 104 rotates. Along with this, the first transmission gear 112 and the second transmission gear 113 rotate, and at the same time, the third rotation shaft 110 rotates.

  Prior to the stepping motion of the foot pedal 109, the propulsion direction switching lever 7 is operated to switch the clutch, and the propulsion direction of the hull 1 is determined. In FIG. 4, since the clutch is in a neutral state, one of the first and second clutch cylinders 205 and 206 is changed by operating the clutch connecting rod 215 to change one of the first and second clutch cylinders 207 and 208. And the rotational force of the third rotary shaft 110 is transmitted to the screw 5 via the propulsion drive shaft 201. Here, as an example, if the propulsion direction switching lever 7 is set so that the hull 1 moves forward when it is tilted forward and reverse when it is tilted backward, the hull can be easily operated.

  Further, the propulsion direction of the hull 1 is performed by rotating the rudder plate 6 via the steering wire 232 by operating the handle 3.

  In addition, since the water bicycle of the embodiment can maintain the stopped state of the hull by making the clutch neutral in addition to the function of moving the hull forward and backward, the bicycle is rowed without moving the hull on the water. Therefore, it can be used not only as a water vehicle but also as an exercise equipment or a beauty exercise equipment.

Second Embodiment FIG. 7 is a side view showing a second propulsion drive device in the second embodiment, in which the speed change means for rotating the third rotating shaft 110 connected to the rotation direction switching device 200 is Although different from the case of the first embodiment, the other configuration of the propulsion drive device 100 is the same as that of the first embodiment. Here, only the secondary amplification mechanism 300 of the second propulsion drive unit will be described, and the description of the other parts will be omitted.

  In the second propulsion drive device in the second embodiment, the means for transmitting the rotation generated by the pedaling motion from the first rotation shaft 101 to the second rotation shaft 104 is the first chain gear 103 and the second chain. The chain 207 hung on the gear 106 is the same as in the first embodiment, but the secondary amplification mechanism 300 that transmits the rotation from the second rotation shaft 104 to the third rotation shaft 110 is different.

  The secondary amplifying mechanism 300 described above is configured by connecting a first transmission chain gear 301 provided on the second rotary shaft 104 and a second transmission chain gear 302 provided on the third rotary shaft 110 by a chain 303. is there. In the embodiment, since the diameter of the first transmission chain gear 301 is formed larger than the diameter of the second transmission chain gear 302, the rotation generated by the pedaling motion of the foot pedal 109 is changed to high speed rotation. And transmitted to the third rotating shaft 110.

  Since the secondary amplifying mechanism 300 in the second embodiment is a chain 303 hung on the transmission chain gears 301 and 302, by appropriately selecting the installation positions of the first rotating shaft 101 and the second rotating shaft 104, A large gear ratio can be obtained, thereby enabling high-speed operation. These transmission chain gears are connected by a chain 303, but a timing belt can be used instead of the chain.

Third Embodiment FIG. 8 is a side view showing a third propulsion drive device in the third embodiment, and a mechanism for rotating a third rotating shaft 110 connected to the rotation direction switching device 200 is a first mechanism. Although different from the embodiment, also in this case, the other configurations of the propulsion drive device 100 are the same as those of the first embodiment. Therefore, only the secondary amplifying mechanism 400 of the third propulsion drive unit has been described, and the description of the other parts has been omitted.

  In the third propulsion driving device in the third embodiment, the means for transmitting the rotational force from the first rotating shaft 101 to the second rotating shaft 104 is applied to the first chain gear 103 and the second chain gear 106. The chain 107 is the same as in the first embodiment, but the secondary amplification mechanism 400 for transmitting rotation from the second rotating shaft 104 to the third rotating shaft 110 is different from the other embodiments.

  The secondary amplifying mechanism 400 includes a first transmission friction disc 401 provided on the second rotation shaft 104 and a second transmission friction disc 402 provided on the third rotation shaft 110, and includes a first transmission friction disc. The cross-sectional shape of the peripheral part of the board | substrate 401 has the mountain-shaped engaging part 401a which exhibits a mountain shape. Moreover, the cross-sectional shape of the peripheral part of the 2nd speed change friction disc 402 has the trough type engagement part 402b which exhibits a trough shape, and the crest type engagement part 401a of the 1st speed change friction disc 401 is the 2nd. It is pressed against the valley-shaped engaging portion 402b of the speed change friction disc 402, and functions as a friction clutch, so that the hull can be started smoothly.

  In the embodiment, the mountain-shaped engagement portion 401a of the first speed change friction disc 401 and the valley-type engagement portion 402b of the second speed change friction disc 402 are pressed against each other. If the valley engagement portion 402b of the friction disc 402 is pressed against the mountain engagement portion 401a of the first speed change friction disc 401 by applying an elastic force from both sides (not shown), the clutch performance This improves the rotation and reliably transmits the rotation.

  Since the diameter of the first speed change friction disc 401 is formed larger than the diameter of the second speed change friction disc 402, the rotation generated by the pedaling motion of the foot pedal 109 is changed to high speed rotation. Thus, it can be transmitted to the third rotating shaft 110.

  In any one of the first to third embodiments, the present invention can obtain a propulsive force for propelling the hull by a pedaling motion of a foot pedal having the same structure as that of a bicycle. Since it has a clutch structure that not only moves the hull forward and backward by pedaling but also keeps the hull stopped, it is a vehicle that can be used as a leisure and beauty exercise equipment.

BRIEF DESCRIPTION OF THE DRAWINGS The water bicycle which concerns on this invention is shown schematically, A is a side view of the whole, B is the top view. The side view which shows the propulsion drive apparatus in 1st Example. The top view which shows the propulsion drive apparatus in 1st Example. The top view which shows the driving | operation switching structure which switches the forward / backward driving | running | working of a hull. The side view which shows the driving | operation switching structure which switches the forward / backward driving | running | working of a hull. The top view which shows the steering structure of a hull. The side view which shows the secondary amplification mechanism of the propulsion drive apparatus in 2nd Example. The secondary amplification mechanism of the propulsion drive device in a 3rd example is shown, A is a side view and B is a sectional view showing the engagement state of a speed change friction disk. The side view and top view which show the water bicycle of prior application invention which this inventor proposed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hull 2 Pipe frame 2a Front pipe 2b Rear pipe 2c Horizontal pipe 3 Handle 4 Saddle 5 Screw 6 Rudder plate 7 Propulsion direction switching lever 100 1st propulsion drive device 101 1st rotating shaft 102 1st bearing 103 1st bearing 103 Chain gear 104 Second rotating shaft 105 Second bearing 106 Second chain gear 107 Chain 108 Crank rod 109 Foot pedal 110 Third rotating shaft 111 Third bearing 112 First transmission gear 113 Second transmission gear 114 Fourth bearing 200 Rotational direction switching device 201 Propulsion drive shaft 202 Main bevel gear 203 First sub bevel gear 204 Second sub bevel gear 205 First clutch cylinder 206 Second clutch cylinder 207 First clutch receiver Cylinder 208 Second clutch cylinder 209, 210 Clutch teeth 211, 212 Class H tooth receiving teeth 213, 214 Moving ring 215 Clutch connection rod 216, 217 Bearing 218 Universal joint 219 Flexible shaft 220 Outer cylinder 230 Rudder shaft 231 Rudder operation rod 232 Steering wire 233 Pulley 234 Wire operation rod 300 Second propulsion drive device Secondary amplifying mechanism 301 first transmission chain gear 302 second transmission chain gear 303 chain 400 secondary amplifying mechanism of the third propulsion drive device 401 first transmission friction disc 402 second transmission friction disc

Claims (3)

  A propulsion drive device (100) provided in the hull (1) has a first rotating shaft (101), a second rotating shaft (104), and a third rotating shaft (110), and 1 rotation axis and the second rotation axis are connected via a primary amplification mechanism of rotation speed, and the second rotation axis and the third rotation axis are connected via a secondary amplification mechanism of rotation speed. The third rotation shaft is connected to a propulsion drive shaft (201) that rotates a screw via a rotation direction switching device (200), and the primary amplification mechanism of the rotation speed is a chain attached to a chain gear. (107) and the like, and the secondary amplification mechanism for the rotational speed includes a first transmission gear (112) provided on the second rotation shaft and a second transmission gear (provided on the third rotation shaft). 113), and the rotational direction switching device has a clutch structure, The first clutch cylinder (205) and the second clutch cylinder (206), which are coupled to the third rotation shaft and rotate, and are provided on the propulsion drive shaft so as to be freely rotatable, and integrally with the propulsion drive shaft. A first clutch receiving cylinder (207) and a second clutch receiving cylinder (208) that are rotatably provided and slidable in the axial direction are provided, and the first and second clutch receiving cylinders are provided as shafts. By moving in the direction, the rotation of the third rotation shaft can be selected in the forward / reverse direction and the neutral state with respect to the propulsion drive shaft, and a bicycle is mounted on the first rotation shaft of the propulsion drive device. A water bicycle comprising a crank rod and a foot pedal having the same structure as that of the drive mechanism, and propelling the hull by pedaling motion of the foot pedal.   The secondary amplification mechanism of the rotational speed in the propulsion drive device (100) is provided on the first transmission chain gear (301) provided on the second rotary shaft (104) and the second provided on the third rotary shaft (110). The water bicycle according to claim 1, wherein the transmission chain gear (302) is connected by a chain (303) or a timing belt.   The secondary amplification mechanism of the rotational speed in the propulsion drive device (100) is provided on the first rotating friction disc (401) provided on the second rotating shaft (104) and the second provided on the third rotating shaft (110). And a trough-shaped engagement portion formed on the peripheral portion of the second transmission friction disc by a chevron engagement portion (401a) formed on the peripheral portion of the first transmission friction disc. The water bicycle according to claim 1, wherein the water bicycle is in pressure contact with (402b).

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