TW202144235A - Water pedaling propulsion device with improved transmission efficiency - Google Patents

Abstract

The present invention relates to a water pedaling propulsion device with improved transmission efficiency, which includes a boat body, a control rod, and a power system. By stepping a first pedal and a second pedal in turn, a first input rod and a second input rod are brought into reciprocating movement alone their respective curved paths, and meanwhile a first connection rod, a first output rod, a second connection rod, and a second output rod are brought into rotation along their respective circular paths. Thereby, a first bevel gear, a second bevel gear, a third bevel gear, and a fourth bevel gear are driven to rotate in sequence, and a hull is thus driven to generate a propulsion for the boat body to move forward.

Description

Water pedal propulsion device that can improve transmission efficiency

The present invention relates to a water pedaling propulsion device which can make pedaling action more labor-saving and more efficient in power output.

Due to Taiwan's beautiful conditions surrounded by the sea, many marine leisure equipment has become increasingly popular in recent years, making marine activities flourish. Nowadays, the types of marine leisure options are more diverse, such as swan boats, banana boats, wind wave boards, etc. All counties and cities in Taiwan have places suitable for water leisure activities. Even in Nantou, which is not close to the sea, there is a vast and beautiful Sun Moon Lake. Therefore, water leisure activities are one of the few leisure and entertainment that is not limited by geographical location and can relax the body and mind. Although there are more and more leisure activities and facilities today, due to price considerations and limited use time, many restrictions are caused, and they cannot be widely popularized.

For example, there is the new patent case No. 365959 "Water Manpower Driven Leisure Boat" announced on August 1, 1988, which discloses that it consists of a hull, a driving mechanism and a steering mechanism arranged inside the hull. , the rear end of the hull is provided with a pipe protruding from the bottom of the hull, and the driving mechanism is composed of a sprocket, a gearbox and a propeller that extends the power to the inside of the above-mentioned pipe by the gearbox. There is a pedal. After the user manually steps on the pedal to make the sprocket rotate, it is converted into high-speed power through the gearbox, so that the propeller rotates at a high speed, so that the water flow is ejected from the pipe fittings, and then pushes the hull forward. The steering mechanism controls the forward direction of the hull. This kind of leisure boat not only does not splash water, but also travels at a relatively high speed, which is recreational and interesting, and can also have the effect of sports.

The previous case of the patent uses human power to step on to move forward, but the kinetic energy generated after the step is transmitted through the drive mechanism will cause energy consumption, coupled with the resistance in the water, not only consumes energy when stepping, but also The kinetic energy that can drive the hull forward has become quite small, so the forward speed is quite slow, which is not in line with the use efficiency. In particular, the way of pedaling with both feet requires a full circle to complete a stroke, which is not only laborious, but also requires a larger circular pedaling space, which causes the hull to be too large and cannot be reduced in size.

Another example is the patent case of Invention No. I516414 "Water Running Power Boat" announced on January 11, 2005 of the Republic of China, which discloses that a direction control mechanism is pivoted on a plate body, and the direction control mechanism is derived from the plate body. One end extending upward from the upper side is provided with a holding part, and the end extending downward from the lower side of the plate body is provided with a direction adjusting part; a driving mechanism is arranged on the plate body and includes a running unit and a propulsion unit , the running pedal unit is rotatably arranged on the upper side of the board body, the propulsion unit is in a rotatable connection relationship with the running pedal unit and extends downward to one end of the lower side of the board body with a propulsion component, the running pedal unit can The rotation drives the propulsion component to rotate to generate a propulsion power. In this way, it can have multiple sports modes and leisure and entertainment functions at the same time, and can also adjust the required running speed, and even obtain all relevant information.

The previous case of the patent uses the running method to advance through the plate body of the driving mechanism, but the driving mechanism also has the disadvantage of energy consumption, and the running method consumes a lot of physical strength, so it is not ideal for use.

In view of this, the conventional water pedaling devices all have the above-mentioned disadvantages. Therefore, the present invention provides a water pedaling propulsion device that can improve transmission efficiency, including: a hull, which has a buoyancy, and a pad is arranged on the hull; a control lever, which is pivoted on the hull, the The control rod protrudes from the top of the hull and is provided with a handle, and the control rod protrudes from the bottom of the hull with a rudder; a power system, the power system includes a pedaling propulsion unit and a transmission unit, The pedaling and propulsion unit is provided with a mounting seat, the mounting seat is combined and fastened on the hull, and the mounting seat is provided with a first side surface and a second side surface opposite to each other, and the pedaling and propulsion unit is provided with a first pedaling component and A second pedal assembly, the first pedal assembly is provided with a first pedal, the first pedal is combined with a first connecting rod set, and the first connecting rod set includes a first input rod and a first output rod and a first connecting rod, one end of the first input rod is pivotally connected to the first side, the first input rod, the first output rod, the first connecting rod and the first side form a four-link A group mechanism, the second pedal assembly is provided with a second pedal, the second pedal is combined with a second connecting rod group, the second connecting rod group includes a second input rod, a second output rod and a second A connecting rod, one end of the second input rod is pivotally connected to the second side at an appropriate angle from one end of the first input rod, the second input rod, the second output rod, the second connecting rod and The second side surface constitutes another four-bar linkage mechanism, the transmission unit is mounted on the mounting seat, and the transmission unit is provided with a first bevel gear, a second bevel gear, a third bevel gear and a The fourth bevel gear, the first bevel gear train is combined with a first shaft, and the two ends of the first shaft are respectively combined with one end of the first output rod and one end of the second output rod. The gear train meshes with the first bevel gear, the second bevel gear is coupled to one end of a second shaft, the third bevel gear is coupled to the other end of the second shaft, and the fourth bevel gear The system is meshed with the third bevel gear, the fourth bevel gear is combined with a third shaft, and one end of the third shaft is combined with a propeller; by stepping on the first pedal and the second pedal alternately, to drive the first pedal An input rod and the second input rod respectively exhibit a moving stroke of a reciprocating curve, and the first connecting rod and the first output rod, the second connecting rod and the second output rod respectively generate a circular rotation stroke, Through the first output rod and the second output rod, the first bevel gear, the second bevel gear, the third bevel gear and the fourth bevel gear are rotated in sequence to drive the propeller to rotate to generate A thrust to move the hull forward.

The above-mentioned hull is combined with a buoyancy element by means of a plurality of straps to provide the hull with the buoyancy.

The above-mentioned buoyancy element is an air bag, a floating ball, a wooden block, a floating board, a poly dragon or a plastic.

The bottom of the above-mentioned mounting seat penetrates the hull and is located at the bottom of the hull.

The control lever is located between the seat cushion and the mounting seat.

The other end of the first input rod is combined with the first pedal, one end of the first output rod is pivotally connected to the first side surface, and the other end of the first output rod is pivotally connected to one end of the first connecting rod , the other end of the first connecting rod is pivoted at a position close to 1/3 of one end of the pivoted end of the first input rod.

The other end of the second input rod is combined with the second pedal, one end of the second output rod is pivotally connected to the second side surface, and the other end of the second output rod is pivotally connected to one end of the second connecting rod , the other end of the second connecting rod is pivoted at a position close to 1/3 of one end of the pivoted end of the second input rod.

The above-mentioned propellers protrude from the bottom of the mounting seat.

The first bevel gear, the second bevel gear, the third bevel gear and the fourth bevel gear train respectively have helical teeth meshing with each other, and the first bevel gear and the second bevel gear have helical teeth. The gear ratio is greater than 1, and the gear ratio of the third bevel gear to the fourth bevel gear is greater than or equal to 1, so as to achieve the effect of speed-up transmission, increase the speed of the propeller and improve the propulsion efficiency.

The above technical features have the following advantages:

1. Use the four-bar linkage mechanism to convert the curve movement of the pedal into a circular rotation stroke, just step on the pedal in turn to drive and link to the propeller through the bevel gear, and use the propeller to generate a reaction force to move the hull forward. The pedalling action is less effort and the power delivery is more efficient.

2. The operation is quite simple, easy to use, and has high safety. There is no age restriction at all, so it is suitable for a wide range of age groups.

3. It will help to improve the usability and interest of water activities, increase the types of marine leisure activities, and promote the development of the marine leisure industry.

4. Completely rely on manual operation, do not need to use fuel or electricity, so it will not waste energy, nor will it emit waste gas and cause air pollution.

5. The manufacturing cost is low, so the price can be relatively reduced to achieve the purpose of mass popularization.

6. Since the hull is controlled by the pedaling method, it can also achieve the effect of fitness in the leisure time.

7. Since the first pedal and the second pedal are stepped on in turn to generate a curvilinear movement, the risk of knee injury can be reduced.

8. The overall structure is quite simple, and the power system and the hull can be easily disassembled and separated, which is convenient for carrying and storage, and is helpful for self-assembly after transporting to the destination. And this power system can be assembled with various buoyant floating bodies, just like the use of outboard motors, which makes the power system have higher independence and wider application functions.

Please refer to the first and second figures, the embodiment of the present invention includes: a hull 1, a joystick 2 and a power system (including a pedaling propulsion unit 3 and a transmission unit 4), wherein:

The hull 1 is made of a wood, a glass fiber, a styrofoam, a plastic or a foam and other materials with low density, light weight and high buoyancy. The hull 1 is made of a high-strength structure so that the hull 1 has a high-strength deck. According to the embodiment of the present invention, the hull 1 is combined with a buoyancy element 12 through a plurality of straps 11, and the buoyancy element 12 can be an air bag, a floating ball, a wooden block, a floating board, a poly dragon or a plastic etc., thereby providing the hull 1 with the buoyancy. The shape of the hull 1 is set as a gourd shape, an oval shape, a shuttle shape or a circle. In addition, the hull 1 is provided with a pad 13 .

The joystick 2 is pivoted on the hull 1 . The control rod 2 protrudes from the top of the hull 1 and is provided with a handle 21 , and the control rod 2 protrudes from the bottom of the hull 1 and is provided with a rudder 22 for relative to the hull 1 . Rotating the handle 21 left and right can link the rudder 22 to swing left and right to control the forward direction of the hull 1 .

The power system is integrated with the hull 1 . The power system includes a pedaling propulsion unit 3 and a transmission unit 4 . The pedaling propulsion unit 3 is provided with a mounting seat 30 , the mounting seat 30 is movably combined with the hull 1 , and the power system can be disassembled from the hull 1 through the mounting seat 30 to facilitate the power system and the hull 1 . The hull 1 is separated, can be easily carried or stored, and can be assembled by itself after arriving at the destination. The bottom of the mounting seat 30 penetrates the hull 1 and is located at the bottom of the hull 1 , and the mounting seat 30 is provided with a first side 301 and a second side 302 opposite to each other. The pedaling propulsion unit 3 is provided with a first pedaling component 31 and a second pedaling component 32 . As shown in the third figure, the first pedal assembly 31 is provided with a first pedal 311, the first pedal 311 is combined with a first connecting rod set 33, and the first connecting rod set 33 includes a first input A rod 331, a first output rod 332 and a first connecting rod 333, one end of the first input rod 331 is pivotally connected to the first side surface 301 of the mounting seat 30, and the other end of the first input rod 331 is Combine with the first pedal 311 . One end of the first output rod 332 is pivotally connected to the first side surface 301 , the other end of the first output rod 332 is pivotally connected to one end of the first connecting rod 333 , and the other end of the first connecting rod 333 is The first input rod 331 is pivoted at a position close to 1/3 of one end of the pivoted end of the first input rod 331 , by the first input rod 331 , the first output rod 332 , the first connecting rod 333 and the first side surface 301 A four-bar linkage mechanism is formed.

As shown in the fourth figure, the second pedal assembly 32 is provided with a second pedal 321, the second pedal 321 is combined with a second connecting rod set 34, and the second connecting rod set 34 includes a second input The rod 341 , a second output rod 342 and a second connecting rod 343 , one end of the second input rod 341 is pivotally connected to the second side surface 302 at an appropriate angle from one end of the first input rod 331 . The other end of the second input rod 341 is combined with the second pedal 321 . One end of the second output rod 342 is pivotally connected to the second side surface 302 , the other end of the second output rod 342 is pivotally connected to one end of the second connecting rod 343 , and the other end of the second connecting rod 343 is The second input rod 341 is pivoted at a position close to 1/3 of one end of the pivoted end of the second input rod 341 , through the second input rod 341 , the second output rod 342 , the second connecting rod 343 and the second side surface 302 Another four-bar linkage mechanism is formed. The transmission unit 4 is mounted on the mounting seat 30 . As shown in FIG. 5 , the transmission unit 4 is provided with a first bevel gear 41 , a second bevel gear 42 , a third bevel gear 43 and a fourth bevel gear 44 . The first bevel gear 41 is coupled with a first shaft 45 , and two ends of the first shaft 45 are coupled between one end of the first output rod 332 and one end of the second output rod 342 respectively. The second bevel gear 42 is engaged with the first bevel gear 41 , the second bevel gear 42 is coupled to one end of a second shaft 46 , and the third bevel gear 43 is coupled to the second bevel gear 46 the other end of the shaft 46 . The fourth bevel gear 44 meshes with the third bevel gear 43 , the fourth bevel gear 44 is coupled with a third shaft 47 , and one end of the third shaft 47 is coupled with a propeller 48 , the propeller 48 It protrudes from the bottom of the mounting seat 30 . Furthermore, the first bevel gear 41 , the second bevel gear 42 , the third bevel gear 43 and the fourth bevel gear 44 respectively have helical teeth meshing with each other. And the gear ratio of the first bevel gear 41 and the second bevel gear 42 is greater than 1. The gear ratio of the third bevel gear 43 and the fourth bevel gear 44 is greater than or equal to 1, so that the effect of speed-increasing transmission can be achieved.

During use, as shown in the first and sixth figures, a user A can sit on the seat cushion 13, and then step on the first pedal 311 and the second pedal 321 with both feet, respectively. 2 is located between the seat cushion 13 and the mounting seat 30 , and both hands are held on the handle 21 of the joystick 2 to control the forward direction of the hull 1 . Then both feet step on the first pedal 311 and the second pedal 321 alternately. As shown in the third and seventh figures, when one of the feet steps on the first pedal 311, the first pedal 311 will drive the first input of the first link set 33 during the moving process The rod 331 rotates with a pivot as the center of rotation, and presents a curved moving stroke B forward (as shown in the seventh and eighth figures). At the same time, the first input rod 331 is linked to the first connection The rod 333 and the first output rod 332 generate a circular rotation stroke C greater than 180 degrees (as shown in Figures 7 and 8), and when the other foot steps on the second pedal 321, the second link group The actuation mode of 34 is the same as that of the first link group 33, and the movement stroke is just opposite to that of the first link group 33, that is, when one foot steps on the first pedal 311 forward, the other foot is just affected by the first link group 311. The traction of the second pedal 321 is retracted backward. Therefore, when both feet step on the first pedal 311 and the second pedal 321 alternately, the first input rod 331 of the first link set 33 and the second input rod of the second link set 34 can be driven 341 respectively present a moving stroke of a reciprocating curve (as shown in the seventh and eighth figures), and the first connecting rod 333 , the first output rod 332 and the second connecting rod 343 and the second output rod 342 A continuous rotation stroke of one circle is generated respectively (as shown in Figure 7 and Figure 8). In this way, as shown in the fifth and sixth figures, the first output rod 332 and the second output rod 342 (as shown in the seventh and eighth figures) jointly drive the first shaft 45 to rotate, so that the The first bevel gear 41 synchronously drives the second bevel gear 42 to rotate, and the second bevel gear 42 then drives the third bevel gear 43 to rotate through the second shaft 46 , and the third bevel gear 43 rotates. The fourth bevel gear 44 is re-engaged to rotate, and finally the fourth bevel gear 44 drives the propeller 48 to rotate through the third shaft 47 , and is based on the first bevel gear 41 and the second bevel gear 42 . The gear ratio is greater than 1, the gear ratio of the third bevel gear 43 and the fourth bevel gear 44 is greater than or equal to 1, in order to achieve the effect of speed-up transmission, so that the speed of the propeller 48 is increased to improve the propulsion efficiency, so that the Hull 1 is allowed to move forward. In this way, the propeller 48 can be continuously rotated by stepping on both feet in turn, and then the handle 21 of the joystick 2 can be controlled with both hands to control the swing direction of the rudder 22 and the forward direction of the hull 1 .

In the present invention, through actual tests, the buoyancy of the hull is first considered and expressed by the following calculation formula.

W _body ≦W _buoy (1)

W _body =W _deck +W _thrust +W _passenger (2)

W _buoy =V _underwater ×ρ _water ×g _gravity (3)

In formula (1), W _body represents the weight of the entire ship and its crew, and W _buoy represents the buoyancy generated by the hull draft. It is clear that W _buoy must be greater than or equal to W _body in order for the entire ship and its occupants to float on the water.

In formula (2), the weight W _{body of} a whole ship is defined as the sum of the combined unit deck W _deck of the hull, the combined unit propulsion device W _thrust and the crew W _passenger .

_{In formula (3), the buoyancy W buoy} of the hull can be calculated by the Archimedes principle, in this formula V _underwater represents the volume of water discharged by the hull, ρ _water is the density of water, ρ _water ≈ 1(g/ cm ³ ), g _gravity is the acceleration of gravity, g _gravity =9.8(m/s ² ). Considering W _deck =10(kgw), W _thrust =30(kgw), so W _body =10+30+W _passenger =(40+W _passenger )(kgw), so the relationship between _{V underwater} and W _{body can be calculated.}

W _{body ≤W buoy} ;

(40+W _passenger )×10 ³ (gw)≤V _underwater (cm ³ )×1(g/cm ³ )×g _gravity ;

V _underwater (cm ³ )≥(40+W _passenger )×10 ³ (cm ³ ).

Therefore, two large truck tubes of different sizes were used in the test. The outer diameter of the large inner tube was 100 (cm), the diameter of the inflatable ring was 25 (cm), and the outer diameter of the small inner tube was 90 (cm). The diameter is 20 (cm) to provide the buoyancy of the hull on the water, so _{the relationship between the draught of the hull (cm) and the hull weight W body} (kgw), that is, the passenger weight W _passenger (kgw), can be obtained. , as shown in Figure 9. It can be seen from the ninth figure that considering a crew member with a weight of 70 (kgw), the draught of the hull is about 13.6 (cm), which is a draught of about 55% of the height of the inner tube. This draught can provide the hull quite stable. 's ride. In addition, the upper limit of the passenger carrying weight of the hull is about 160 (kgw), so it is easy to provide two-person occupancy.

And for the consideration of propulsion efficiency, it can be expressed by the following formula:

v _boat ≈η ^-1 ×ω _rotation (4)

η=η(η _ω , η _r ) (5)

Equation (4) for navigation is the drag coefficient [eta], [eta] simplifies this Sailing resistance coefficient and propulsion system efficiency coefficient η _r wave resistance coefficient of water the product of _η ω _η = η ω × η _r.

η _r and _η ω may be expressed in the following form:

η _ω =ρ _ω ×ω _rotation ^α ;

η _r =ρ _r ×v _boat ^β ;

So formula (4) becomes the following formula:

v _boat =η ^-1 ×ω _rotation ⇒ρ _ω ^-1 ×ρ _r ^-1 ×ω _rotation ^(1-α) ×v _boat ^-β ⇒v _boat ^(1+β) =ρ _ω ^-1 ×ρ _r ^-1 ×ω _rotation ^(1-α) ⇒ v _boat =[ρ _ω ^-1 ×ρ _r ^-1 ×ω _rotation ^(1-α) ] ^1/(1+β) .

Take ρ _ω =0.4, ρ _r =0.2, then (α, β)=(0.1, 1.0), (α, β)=(0.1, 1.5), (α, β)=(0.1, 2.0) under v _{The relationship between boat} (m/s) and ω _rotation (2π×rpm) is shown in Figure 10. If (α, β)=(0.1, 1.0) is adopted, and the pedaling rate is 100 times per minute for the left and right feet , the hull can sail on the water at a speed of about 50 (m/min).

Through the above-mentioned actual test, it is enough to prove that the water pedaling device of the present invention can indeed be realized and achieve the above-mentioned effects.

Based on the descriptions of the above embodiments, one can fully understand the operation, use and effects of the present invention, but the above-mentioned embodiments are only preferred embodiments of the present invention, which should not limit the implementation of the present invention. The scope, that is, the simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the description of the invention, all fall within the scope of the present invention.

1: Hull 11: Drawstring 12: Buoyancy element 13: Seat cushion 2: Joystick 21: Grip 22: Rudder 3: Step on the propulsion unit 30: Mounting seat 301: The first side 302: Second side 31: The first pedal assembly 311: First pedal 32: Second pedal assembly 321: Second pedal 33: The first link group 331: First input rod 332: The first output rod 333: The first connecting rod 34: Second connecting rod group 341: Second input rod 342: Second output rod 343: Second connecting rod 4: Transmission unit 41: The first bevel gear 42: Second bevel gear 43: The third bevel gear 44: Fourth bevel gear 45: The first axis 46: Second axis 47: Third axis 48: Propeller A: user B: The movement stroke of the curve C: Circular rotation stroke

[Figure 1] is a three-dimensional appearance view of an embodiment of the present invention.

[The second figure] is a schematic diagram of the bottom of the hull of the embodiment of the present invention.

[Figure 3] is a schematic diagram of the first pedal assembly according to the embodiment of the present invention.

[FIG. 4] is a schematic diagram of the second pedal assembly according to the embodiment of the present invention.

[FIG. 5] is a schematic diagram of the transmission unit according to the embodiment of the present invention.

[Figure 6] is a schematic diagram of the use of the embodiment of the present invention.

[Fig. 7] is a schematic diagram of the curve movement stroke of forward pedaling according to the embodiment of the present invention.

[The eighth figure] is a schematic diagram of the curved movement stroke of the backward retraction according to the embodiment of the present invention.

[Fig. 9] is a graph showing the relationship between the draft and the occupant's weight when the embodiment of the present invention is actually tested.

[Picture 10] is a diagram showing the relationship between the forward speed of the hull and the pedaling speed during the actual test of the embodiment of the present invention.

1: Hull

11: Drawstring

12: Buoyancy element

13: Seat cushion

2: Joystick

21: Grip

3: Step on the propulsion unit

30: Mounting seat

301: The first side

31: The first pedal assembly

311: First pedal

32: Second pedal assembly

321: Second pedal

33: The first link group

331: First input rod

332: The first output rod

333: The first connecting rod

34: Second connecting rod group

341: Second input rod

342: Second output rod

343: Second connecting rod

41: The first bevel gear

42: Second bevel gear

45: The first axis

Claims (9)

A water stepping propulsion device capable of improving transmission efficiency, comprising: a hull with a buoyancy on which a cushion is provided; a control rod is pivoted on the hull, the control rod protrudes from the top of the hull and is provided with a handle, and the control rod protrudes from the bottom of the hull with a rudder; A power system, the power system includes a pedaling propulsion unit and a transmission unit, the pedaling propulsion unit is provided with a mounting seat, the mounting seat is combined with the hull, and the mounting seat is provided with an opposite first side and a second side, the pedaling and propulsion unit is provided with a first pedaling component and a second pedaling component, the first pedaling component is provided with a first pedal, the first pedal is combined with a first link group, the The first connecting rod set includes a first input rod, a first output rod and a first connecting rod, one end of the first input rod is pivotally connected to the first side surface, the first input rod, the first output rod The rod, the first connecting rod and the first side form a four-bar linkage mechanism, the second pedal assembly is provided with a second pedal, the second pedal is combined with a second linkage, the second link The rod set includes a second input rod, a second output rod and a second connecting rod, one end of the second input rod is pivotally connected to the second side surface at an appropriate angle from one end of the first input rod, The second input rod, the second output rod, the second connecting rod and the second side surface form another four-bar linkage mechanism, the transmission unit is attached to the mounting seat, and the transmission unit is attached with a first umbrella type gear, a second bevel gear, a third bevel gear and a fourth bevel gear, the first bevel gear train is combined with a first shaft, and the two ends of the first shaft are respectively combined with the first bevel gear One end of the output rod and one end of the second output rod, the second bevel gear train meshes with the first bevel gear, the second bevel gear is combined with one end of a second shaft, the third bevel gear The gear is combined with the other end of the second shaft, the fourth bevel gear train is meshed with the third bevel gear, the fourth bevel gear is combined with a third shaft, and one end of the third shaft is combined with a propeller ; By stepping on the first pedal and the second pedal alternately, the first input rod and the second input rod are driven to respectively present a moving stroke of a reciprocating curve, and the first connecting rod, the first output rod, the first The two connecting rods and the second output rod respectively generate a circular rotation stroke, and the first bevel gear, the second bevel gear and the third bevel gear are driven in sequence through the first output rod and the second output rod. The type gear and the fourth bevel gear rotate to drive the propeller to rotate to generate a thrust, so that the hull can move forward. The water pedal propulsion device with improved transmission efficiency according to claim 1, wherein the hull is combined with a buoyancy element through a plurality of straps to provide the hull with the buoyancy. As claimed in claim 2, the water pedaling propulsion device with improved transmission efficiency, wherein the buoyancy element is an air bag, a floating ball, a wooden block, a floating board, a poly dragon or a plastic, etc. The water pedal propulsion device with improved transmission efficiency according to claim 1, wherein the bottom of the mounting seat penetrates the hull and is located at the bottom of the hull. The water pedaling propulsion device capable of improving transmission efficiency according to claim 1, wherein the control lever is located at a position between the seat cushion and the mounting seat. The water pedal propulsion device capable of improving transmission efficiency as claimed in claim 1, wherein the other end of the first input rod is combined with the first pedal, one end of the first output rod is pivotally connected to the first side surface, and the first The other end of an output rod is pivotally connected to one end of the first connecting rod, and the other end of the first connecting rod is pivotally connected to a position close to 1/3 of the pivoted end of the first input rod. The water pedal propulsion device with improved transmission efficiency as claimed in claim 1, wherein the other end of the second input rod is combined with the second pedal, one end of the second output rod is pivotally connected to the second side surface, and the first The other ends of the two output rods are pivotally connected to one end of the second connecting rod, and the other end of the second connecting rod is pivotally connected to a position close to 1/3 of the pivoted end of the second input rod. The water pedal propulsion device with improved transmission efficiency according to claim 1, wherein the propeller is protruding from the bottom of the mounting seat. The water pedal propulsion device capable of improving transmission efficiency as claimed in claim 1, wherein the first bevel gear, the second bevel gear, the third bevel gear and the fourth bevel gear train respectively have mutually meshing gear trains. Helical gears, the gear ratio of the first bevel gear to the second bevel gear is greater than 1, and the gear ratio of the third bevel gear to the fourth bevel gear is greater than or equal to 1 to achieve the effect of speed-increasing transmission , so that the propeller speed increases and the propulsion efficiency is improved.

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