Body-building and leg-exercising tricycle

Abstract

The invention discloses a body-building and leg-exercising tricycle, which comprises two groups of flywheels, ratchet mechanisms are arranged in the flywheels, the two flywheels are respectively arranged on a rear wheel shaft, and transmission structures are respectively arranged on the two groups of flywheels; four sets of fixed pulleys are installed in the middle of the frame, and a set of fixed pulleys installed on the front face of a vertical stand column of the frame is sleeved with a linkage rope. The bodybuilding and leg exercising tricycle adopts rope transmission or standard bicycle chain transmission, each pedal only reciprocates on a section of arc in the driving process, the bodybuilding and leg exercising tricycle is suitable for a human body to apply force, can apply force and work by utilizing the gravity of a rider, overcomes the defects that the arm of force is zero, dead points exist and excessive idle work is applied in the running process of a traditional tricycle, and is suitable for being applied to the rider. And the riding is more labor-saving. During riding, the knee joint movement range is small, the knees are protected, and the knees are not hurt during body building and leg exercising. And due to near stepless speed change, a rider can better match the force and the speed.

Description

Technical Field

[0001] This invention relates to the field of human-powered tricycles, specifically a fitness leg-training tricycle. Background Art

[0002] The transmission system of most existing human-powered tricycles uses a circular chain drive, and the chain is near the trouser leg, which often gets covered in oil and dirt.

[0003] In traditional human-powered tricycles, the rider generates power through the feet, with the crank rotating in a circular motion. The force exerted by the feet is essentially vertical and downward, causing the torque to repeatedly cycle from zero to maximum and back to zero. During this process, due to the constant changes in the lever arm, much of the effort exerted by the rider is wasted, resulting in excessive energy expenditure. The circular crank rotation also leads to a large range of motion in the knee joint, placing the greatest stress on it. Therefore, it does not provide a good fitness effect. The traditional human-powered tricycle riding method, to some extent, affects the rider's willingness to exercise through cycling. Summary of the Invention

[0004] To fill a market gap, this invention provides a fitness leg-training tricycle.

[0005] The purpose of this invention is to provide a fitness leg-training tricycle to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fitness leg-training tricycle, comprising: The flywheel is configured as two sets, each flywheel containing a ratchet mechanism or other type of overrunning clutch. The two flywheels and the rear wheel are respectively mounted on the rear wheel axle, and the two sets of flywheels are respectively equipped with a transmission structure. The frame has four sets of fixed pulleys installed in the middle, and a linkage rope is sleeved on one set of fixed pulleys installed on the front of the vertical column of the frame. Meanwhile, a transmission structure is sleeved on the other three sets of fixed pulleys. The two ends of the linkage rope are respectively connected to the front ends of two sets of connecting rods, and the two ends of the transmission structure are connected to the adjusting blocks of the connecting rods. The adjusting blocks can move along the length of the connecting rods. The connecting rod has a foot pedal fixed to its front end and is connected to the transmission structure. The rear wheels are configured as two, with each rear wheel mounted on the outside of the rear wheel axle.

[0007] Furthermore, the transmission structure is a transmission rope, which is three-sectioned. The middle section of the transmission rope is an elastic rope, and the two side sections of the elastic rope are non-elastic ropes. The transmission structure includes a winding drive part, a pulley drive part, a connecting part, and an elastic tensioning end. The winding drive part, the pulley drive part, and the connecting part are all configured in two sets. The two sets of winding drive parts are respectively installed on flywheels located on both sides of the rear wheel. The two sets of pulley drive parts are respectively installed on fixed pulleys located on both sides of the top of the middle part of the frame. The lower ends of the two sets of connecting parts are respectively installed on the adjusting block surfaces of the two sets of connecting rods. One set of elastic tensioning ends is installed on a fixed pulley located on the lower side of the frame.

[0008] Furthermore, the number of turns of the winding drive part is at least one set, and the winding drive part is directly wound on the flywheel. At the same time, when the static friction transmission is insufficient, the rope located in the middle of the winding drive part is fixedly installed on the flywheel.

[0009] Furthermore, the transmission structure is a chain drive, with the transmission chain being either three-segment or five-segment. The middle segment is an elastic rope, while the two sides of the transmission chain are bicycle chains. The five-segment bicycle chain is followed by an additional segment without an elastic rope. The length of the bicycle chain on the five-segment transmission chain is shorter than that on the three-segment transmission chain. This transmission chain is a composite structure composed of an elastic rope and a bicycle chain. The bicycle chains at both ends of the transmission chain mesh with chain freewheels, and the other end is mounted on adjusting blocks of two connecting rods via fixed pulleys. The fixed pulleys are corresponding grooved wheels or sprockets.

[0010] Furthermore, the flywheel is groove-shaped with vertical guards on both sides and mounting holes on the vertical guards. The elastic rope of the transmission structure passes through a fixed pulley installed on the lower side of the frame, wraps around the flywheel several times, and then its two ends are connected to the inner holes of the two flywheels respectively. One end of the non-elastic rope of the transmission structure is connected to the outer hole of the flywheel, wraps around the flywheel several times, passes through fixed pulleys located on both sides of the top of the middle part of the frame, and is then installed on the adjusting blocks of the two connecting rods respectively.

[0011] Furthermore, a spindle is mounted on the frame, and a fixed pulley is mounted on the spindle. The end of the connecting rod is mounted on the rear wheel axle. Ball bearings with end caps are installed between the spindle and the pulley seat hole, and between the connecting rod and the rear wheel axle. A pulley guard is mounted on the outside of the fixed pulley, and the pulley guard is mounted on the spindle of the fixed pulley by screws.

[0012] Furthermore, the connecting rod includes an adjusting block, a connecting rod body, a cable, and a compression spring. The size of the adjusting block is adapted to that of the connecting rod body, and the adjusting block is slidably mounted on the connecting rod body. Meanwhile, the compression spring and the adjusting block are mounted in contact, and the cable is connected to the adjusting block.

[0013] Furthermore, a slider is installed below the frame, and an elastic element is connected to it. A fixed pulley that contacts the elastic tension end of the transmission structure is installed on the slider.

[0014] Furthermore, the frame is equipped with a connecting rod stop, and soft objects such as handlebar covers are installed on the connecting rod stop, and the connecting rod stop is adjustable up and down.

[0015] Furthermore, a handlebar is mounted on the frame, and a shift lever is mounted on the handlebar. The shift lever changes the position of the adjusting block on the connecting rod body by raising and lowering the cable, thereby achieving gear shifting.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The transmission structure uses rope drive or a standard bicycle chain. During the driving process, each pedal only reciprocates on a circular arc. This range of motion is exactly the range in which the human body is most suitable for exerting force and the force application effect is the best. Compared with the traditional chain drive structure, it can use the rider's own weight to exert force and do work. It overcomes the shortcomings of traditional tricycles, which have zero lever arm and dead points and do a lot of useless work during operation, making riding more effortless. 2. Compared to the traditional tricycle with its pivot point moved to the rear, the foot pedal's movement space only involves the vertical vertical part of the foot pedal, and the pivot of the linkage can be shared with the rear wheel axle. Of course, the rear wheel axle can also be omitted, and a separate axle can be installed on the frame. Since there is no bottom bracket and chainring, the tricycle frame and overall layout are less restricted, the overall structure of the tricycle is simpler, and less material is used for the frame. 3. The pedal travel distance is relatively small, allowing riders to easily adopt both standing and sitting riding postures. Each posture has its advantages, and riders can switch between them at any time. This allows more muscle groups to relax and exercise during riding, reducing the discomfort of riding in a single sitting posture. Even when riding in a sitting posture, because the pedals move up and down in a near-straight line, the upper body does not need to lean forward as in traditional riding, and the range of motion of the knee joints is much smaller. Because the sitting posture is upright, there is no need to deliberately bend over. Using a wide seat does not affect the power of riding, and the buttocks are well supported, like sitting on a sofa, without any discomfort. The perineum is basically no longer compressed, which is comfortable. The upper body does not lean forward, and the shoulders, wrists, back, neck, and arms are well supported without stiffness. This also increases riding comfort and increases riding distance. 4. The transmission system has undergone a revolutionary change, using rope transmission throughout. The transmission is smooth and requires no more chain lubrication, eliminating the problems of oil stains and chain slippage. It uses pre-lubricated ball bearings, which require no lubrication for their basic lifespan, making it more environmentally friendly. The coefficient of friction is low, the transmission system is easy to maintain, and the transmission ropes are simple and convenient to replace. 5. The adjusting block on the connecting rod can move laterally. By adjusting the position of the connection point of the transmission structure on the connecting rod, the gear shifting function can be realized. This not only solves the problem that ordinary human-powered tricycles do not have a gear shifting function, but also eliminates the expensive and complex gear shifting system of existing high-end tricycles. Furthermore, the gear shifting is more smooth and delicate, allowing each rider to find a more suitable state and adapt to different road conditions such as uphill and downhill. 6. By eliminating the high-tech transmission system and the expensive tower wheel mechanism, the cost of transmission components is greatly reduced, benefiting both users and manufacturers; 7. The knee joint has a small range of motion, so it does not hurt the knee. The knee and leg bear the same force, and the leg muscle groups are fully exercised, resulting in obvious fitness effects, which are better than weighted squats and running. 8. The left and right gears are independently controlled and adjustable, allowing for different levels of force application between the left and right legs. This enables targeted training and strengthening of specific legs, making it particularly suitable for leg training or long-distance cycling. You can rest whichever leg gets tired. 9. Because of the pedaling motion and minimal leg movement, it is suitable for a wide range of heights, from 150cm to 200cm. Simply adjust the seat and handlebar height to allow riders of different heights to find a comfortable riding position. 10. Ingenious transmission and easy maintenance. You can DIY your own transmission system; it's simple, fun, intellectually stimulating, and gives you a strong sense of accomplishment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the transmission structure of the present invention when it is a transmission rope; Figure 3 This is a front view of the structure of the present invention; Figure 4 This is a schematic diagram of the connecting rod structure of the present invention; Figure 5 This is a three-dimensional schematic diagram of the fixed pulley structure of the present invention; Figure 6 This is a photograph of a physical embodiment of the structure of the present invention, specifically embodiment five. Figure 7 This is a photograph of the connecting rod in the seventh specific embodiment of the structure of the present invention; Figure 8 Photographs of pulley blocks according to a specific embodiment of the structure of the present invention; Figure 9 Photographs of a prototype vehicle illustrating a specific embodiment of the structure of this invention;

[0018] In the diagram: 1. Rear wheel; 2. Flywheel; 3. Transmission structure; 31. Winding drive unit; 32. Pulley transmission unit; 33. Connecting part; 34. Elastic tensioning end; 4. Frame; 5. Fixed pulley; 6. Connecting rod; 61. Adjusting block; 62. Connecting rod body; 63. Cable; 64. Compression spring; 7. Foot pedal; 8. Linkage rope; 9. Rear wheel axle; 10. Connecting rod stop; 11. Shift throttle; 12. Pulley guard. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Detailed implementation method one: Please refer to Figure 1-1 0. The present invention provides a technical solution: a fitness leg exercise tricycle, comprising: a flywheel 2, a frame 4, a rear wheel 1, and a connecting rod 6; The flywheel 2 is configured as two sets, each flywheel 2 containing a ratchet mechanism or other type of overrunning clutch, and the rear wheel 1 is mounted on the rear wheel axle 9. At the same time, the two sets of flywheels 2 are respectively mounted on the rear wheel axle 9, and the two sets of flywheels 2 are respectively mounted with a transmission structure 3. Four sets of fixed pulleys 5 are installed in the middle of the frame 4, and a linkage rope 8 is sleeved on one set of fixed pulleys 5 installed on the front of the vertical column of the frame. Meanwhile, a transmission structure 3 is sleeved on the other three sets of fixed pulleys 5. The two ends of the linkage rope 8 are respectively connected to the front ends of two sets of connecting rods 6. The ends of the two sets of connecting rods 6 are mounted on the rear wheel axle 9, the adjusting block 61 is sleeved on the connecting rod 6, and the foot pedal 7 is fixed to the outer side of the other end of the connecting rod 6; The rear wheels 1 are set to two, and the two rear wheels 1 are respectively installed on the outside of the rear wheel axle (9).

[0021] The transmission structure 3 uses either rope drive or standard bicycle chain drive. During the driving process, each pedal 7 reciprocates only along a circular arc, and this range of motion is precisely the range where the human body is most suitable for exerting force and achieving the best force effect. Compared with the traditional chain drive structure, it can utilize the rider's own weight to generate power and do work. It overcomes the shortcomings of traditional bicycles, such as zero lever arm and dead points that result in excessive wasted work, making riding more energy-efficient. It also overcomes the disadvantage of excessive range of motion in the rider's knee joint, which can easily lead to injury. The rider maintains an upright posture without having to deliberately bend over. The wide seat does not affect the power generation during riding. The buttocks are well supported, like sitting on a sofa, without any discomfort. The perineum is basically no longer compressed, providing comfort. The upper body does not lean forward, and the shoulders, wrists, back, neck, and arms are well supported without stiffness, increasing riding comfort and increasing riding distance.

[0022] Specific Implementation Method Two: This implementation method is a further limitation of Specific Implementation Method One. The transmission structure 3 is a transmission rope, which is a three-section rope. The middle section of the transmission rope is an elastic rope, and the two side sections of the elastic rope are non-elastic ropes. The transmission structure 3 includes a winding drive part 31, a pulley drive part 32, a connecting part 33, and an elastic tensioning end 34. The winding drive part 31, the pulley drive part 32, and the connecting part 33 are all configured as two sets. The two sets of winding drive parts 31 are respectively installed on the flywheel 2 located on the rear wheel axle 9. The two sets of pulley drive parts 32 are respectively installed on the fixed pulleys 5 located on both sides of the top of the middle part of the frame 4. The lower ends of the two sets of connecting parts 33 are respectively installed on the adjusting blocks 61 of the two sets of connecting rods 6. One set of elastic tensioning ends 34 is installed on the fixed pulleys 5 located on the lower side of the frame 4.

[0023] The installation method of the transmission structure 3 is as follows: one end of the transmission structure 3 is installed on the connection point of the adjusting block 61 on the connecting rod 6, and then the other end passes around the fixed pulley 5 installed on the same side of the frame 4, then around the flywheel 2 on the same side, and then around the fixed pulley 5 installed in the middle of the frame 4 to reach the other side of the frame 4, passes around the flywheel 2 on the opposite side, and then passes around the fixed pulley 5 installed on the opposite side of the frame 4, and finally connects with the connection point of the adjusting block 61 on the connecting rod 6 on the opposite side. It has good practical effect and reduces production cost.

[0024] like Figure 1As shown: When riding, the user's foot pedal 7 only moves back and forth on an arc. Because the radius of the arc is large, the forward and backward movement distance of the foot pedal 7 is small. This allows the rider to easily adopt both standing and sitting riding postures. Each riding posture has its advantages and can be switched at any time. During riding, more muscle groups are relaxed and exercised, reducing the discomfort of riding in a single sitting posture. Even when riding in a sitting posture, because the foot pedal 7 moves up and down in a near-straight line, the upper body does not need to lean forward as in traditional riding, and the range of motion of the knee joints is also much smaller. Due to the upright riding posture, riding is comfortable, and the leg muscles are subjected to increased force. Riding can exercise the legs and lose weight while riding, increasing the audience for cycling, enhancing people's enjoyment of cycling, and promoting green travel and fitness.

[0025] A connecting rod stop 10 is installed on the frame 4, which serves to bear weight when standing and to limit and protect the connecting rod 6. When riding, when the left pedal 7 moves downward, the left pedal 7 drives the transmission structure 3 to drive the left flywheel 2 and the rear wheel 1 to rotate forward. At this time, the left connecting rod 6 drives the right pedal 7 to move upward through the linkage rope 8. At the same time, under the traction of the transmission structure 3, the right flywheel 2 rotates back, and the right pedal 7 reaches the highest position. Then, when the right foot exerts force, the right pedal 7 moves downward, and the right pedal 7 drives the transmission structure 3 to drive the right flywheel 2 and the rear wheel 1 to rotate forward. At this time, the right connecting rod 6 drives the left pedal 7 to move upward through the linkage rope 8. At the same time, under the traction of the transmission structure 3, the left flywheel 2 rotates back, and the left pedal 7 reaches the highest position, completing one cycle.

[0026] Specific Implementation Method 3: This implementation method is a further limitation of Specific Implementation Method 2. The number of turns of the winding drive part 31 is at least one set, and the winding drive part 31 is directly wound on the flywheel 2. At the same time, a point of the rope loop located in the middle of the winding drive part 31 can be fixed on the flywheel 2. Fixing the middle position point of the winding loop on the winding drive part 31 on the flywheel 2 is not a necessary condition. If the static friction between the toothless flywheel 2 and the rope is sufficient for transmission, it does not need to be fixed.

[0027] After the transmission rope is wound around the toothless flywheel 2, it passes around the fixed pulley 5 installed in the middle of the frame 4 to reach the other side of the frame 4. After winding around the toothless flywheel 2 on the opposite side several times, it passes around the fixed pulley 5 installed on the opposite side of the frame 4, and finally connects to the adjusting block 61 on the connecting rod 6 on the opposite side. Considering the actual needs of the overall vehicle layout and cost reduction, the rear wheel axle 9 can be used as the mounting rotation shaft of the connecting rod 6, or a separate shaft can be welded onto the frame to serve as the mounting rotation shaft of the connecting rod 6.

[0028] The transmission structure 3 uses rope transmission throughout. First, it eliminates the need for lubrication of traditional bicycle chains. Second, it reduces the actual manufacturing cost. Although the price of chains is very low due to China's strong productivity, the metal materials consumed in their production process cannot be reduced. The production process of ropes is much simpler. With the development of new materials, there will be a variety of high-strength fiber material ropes to meet the transmission requirements.

[0029] Specific Implementation Method Four: This implementation method is a further limitation of Specific Implementation Method One. The transmission structure 3 is a chain drive, and the structure is three-section or five-section. The middle section of the transmission structure 3 is an elastic rope, and the two sides of the elastic rope are bicycle chains. This transmission structure 3 is a composite structure composed of elastic rope and bicycle chain. The bicycle chains located at both ends of the elastic rope are respectively engaged with the chain freewheel 2. The two ends are respectively installed on the adjusting blocks 61 on the corresponding connecting rod 6 through corresponding fixed pulleys 5. In the installation process of the three-section transmission structure 3, the corresponding fixed pulley 5 is a chain wheel. When the transmission structure 3 is five-section, it is a standard bicycle chain plus a section of non-elastic rope. The length of the bicycle chain on the five-section transmission structure 3 is less than the length of the three-section bicycle chain. In the installation process of the five-section transmission structure 3, the fixed pulley 5 in contact with the non-elastic rope is a grooved wheel.

[0030] The three-section transmission structure 3 has standard bicycle roller chains on both sides of the elastic rope, while the five-section transmission structure 3 has a standard bicycle roller chain with an additional section of non-elastic rope. The only difference is that the five-section roller chain is shorter and lighter overall, and the corresponding fixed pulley 5 is changed from a sprocket to a grooved wheel, resulting in lower cost. One end of the transmission structure 3 is installed on the adjusting block 61 on the connecting rod 6, then passes around the fixed pulley 5 installed on the same side of the frame 4, and then passes around the chain freewheel 2 on the same side. At this time, the chain segment of the transmission structure 3 is engaged with the corresponding chain freewheel 2. Then it passes around the fixed pulley 5 installed in the middle of the frame 4 to reach the other side of the frame 4, and then passes around the chain freewheel 2 on the opposite side. At this time, the second chain segment of the transmission chain is engaged with the corresponding chain freewheel 2. Then it passes around the fixed pulley 5 installed on the opposite side of the frame 4, and finally it is installed at the connection point on the adjusting block 61 on the connecting rod 6 on the opposite side.

[0031] Specific Implementation Method 5: This implementation method is a further limitation of Specific Implementation Method 1. The flywheel 2 is groove-shaped with vertical guards on both sides and mounting holes on the vertical guards. The elastic rope of the transmission structure 3 passes through the fixed pulley 5 installed on the lower side of the frame 4 in the middle. After the two ends are wound around the two flywheels 2 for a corresponding number of turns, the two ends are respectively connected to the inner holes of the two flywheels 2. One end of the non-elastic rope of the transmission structure 3 is connected to the outer hole of the flywheel 2. After being wound around the flywheel 2 for a corresponding number of turns, it passes through the fixed pulleys 5 located on both sides of the top of the middle part of the frame 4, and is then respectively installed on the adjusting blocks 61 of the two connecting rods 6.

[0032] Specific Implementation Method Six: This implementation method is a further limitation of Specific Implementation Method One. A spindle is installed on the frame 4, and a fixed pulley 5 is installed on the spindle. The end of the connecting rod 6 is installed on the rear wheel axle 9. A ball bearing with an end cap is installed between the spindle and the pulley seat hole, and between the connecting rod 6 and the rear wheel axle 9. This is more environmentally friendly and has a lower coefficient of friction.

[0033] A pulley guard 12 is installed on the outside of the fixed pulley 5 on the frame 4. The pulley guard 12 has a fan-shaped structure and is installed on the spindle of the fixed pulley 5 with screws. The pulley guard 12 can cover the fixed pulley 5, play a role in sports protection, and prevent the rope on the fixed pulley 5 from falling off, thereby improving the stability of the bicycle when riding.

[0034] Specific Implementation Method Seven: This implementation method is a further limitation of Specific Implementation Method One. The connecting rod 6 includes an adjusting block 61, a connecting rod body 62, a cable 63, and a compression spring 64. The size of the adjusting block 61 is adapted to that of the connecting rod body 62. The adjusting block 61 is slidably mounted on the connecting rod body 62. Meanwhile, the compression spring 64 is sleeved on the outside of the connecting rod body 62 and is installed in contact with the adjusting block 61. The cable 63 is connected to the adjusting block 61.

[0035] Adjusting block 61 is slidably connected to the outside of connecting rod body 62. By changing the position of the connecting part 33 of transmission structure 3 on connecting rod 6, the speed change function is achieved. Adjusting block 61 can slide along connecting rod body 62. The rear end of compression spring 64 is fixed to connecting rod body, and the front end abuts against adjusting block 61. One end of cable 63 is connected to adjusting block, and the other end is connected to rotary handle or lever. When cable 63 is shortened by the handle, adjusting block 61 moves towards the rear rotation axis 9 of connecting rod under the tension of cable 63, shortening the lever arm and putting the mechanism in a labor-saving state. When cable 63 is extended by the handle, adjusting block 61 moves towards the front foot pedal 7 of connecting rod under the action of compression spring 64, lengthening the lever arm and putting the mechanism in a high-speed state. Theoretically, under the combined action of the tension of the cable 63 and the thrust of the compression spring 64, the adjusting block 61 can stay at any position in the designed sliding area, thereby achieving near-stepless gear shifting. It is no longer limited by the number of gears and number of teeth of the existing bicycle's chainring, so it allows each rider to find a more suitable riding state and adapt to different road conditions such as uphill and downhill. It eliminates the need for the expensive and complex gear shifting system of existing bicycles. Because the gears on both sides are independently adjustable, it can achieve a special experience of different riding speeds and different force applied by the left and right feet, and can achieve specific leg training or strengthening. The two connecting rods 6 are connected together by the linkage rope 8 after passing around the fixed pulley 5 installed on the frame, so that the two pedals 7 are linked during riding.

[0036] Specific Implementation Method Eight: This implementation method is a further limitation of Specific Implementation Method One. The pulley below the frame 4, which contacts the elastic tensioning end 34, is mounted on the slider. The slider can slide along the frame direction. An elastic element, such as a spring or rubber band, is connected to the slider. Its function is to maintain the tension of the transmission structure 3. In this way, the elastic rope section of the transmission structure 3 can be replaced by a non-elastic rope, which simplifies the structure of the transmission structure 3. However, the structure of this tensioning pulley becomes more complex. This structure can be regarded as a variation of the transmission structure 3. The manufacturer can choose a suitable structure according to the actual production situation and specific process.

[0037] Specific Implementation Method Nine: This implementation method is a further limitation of Specific Implementation Method One. A connecting rod stop 10 is installed on the frame 4. When the connecting rod 6 reaches its limit position, it abuts against the stop, which serves to bear the weight when riding and limit the movement of the connecting rod 6, thus providing a safety protection function. The connecting rod stop is equipped with rubber or other softer parts, which act as a buffer when the connecting rod contacts it, avoiding the impact of a hard landing and making riding more comfortable. The connecting rod stop is connected by a clamping structure and is adjustable up and down.

[0038] Specific Implementation Method 10: This implementation method is a further limitation of any one of Specific Implementation Methods 1 to 9. The frame 4 is equipped with a handlebar, and the handlebar is equipped with a shift throttle 11. The shift throttle 11 changes the position of the adjustment block 61 on the connecting rod body 62 by raising and lowering the cable 63, thereby realizing gear shifting. The shift throttle can easily realize multiple gears and a wide range of raising and lowering. The gear shifting adjustment is smooth and delicate, with near stepless shifting and good speed adjustment effect, which allows the rider to better match force and speed and adapt to various conditions such as going up and down flat slopes and different levels of physical fatigue.

[0039] It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept: for example, a linkage mechanism can be used to replace the linkage rope 8 pulley mechanism to realize the linkage of the left and right pedals 7; the pedals 7 can be installed on the vertical slide rail of the frame 4 to replace the linkage 6; the rear wheel axle can be divided into two sections and the flywheel can be installed on the rear wheel, etc.

[0040] The present invention has a small number of components, a reasonable design, a simple overall structure, low cost, is easy to process and maintain, has high reliability, long service life, high efficiency, and is easy to promote on a large scale.

[0041] This invention transforms the traditional circular motion of tricycles into a reciprocating motion, achieving a better leg-strengthening effect while riding. It significantly improves the power performance of traditional tricycles, overcomes the defects and shortcomings in their transmission process, and makes the tricycle's transmission more suitable for the human body's physiological structure. It utilizes the body's own gravity to maximize the force exertion of the human body and reduce unnecessary force application. This invention offers two riding postures for extended periods: standing and seated, which can be switched at any time, allowing more muscle groups to be exercised. Even when seated, it reduces pressure on the buttocks, improving rider comfort and enhancing the user experience, thus possessing considerable market potential.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A leg-training tricycle, characterized in that, include: Flywheel (2), the flywheel (2) is configured as two sets, the flywheel contains a ratchet mechanism or other type of overrunning clutch, the two flywheels are respectively installed on the rear wheel axle (9), and the two sets of flywheels (2) are respectively equipped with transmission structures (3); The frame (4) has four sets of fixed pulleys (5) installed in the middle. A linkage rope (8) is sleeved on one set of fixed pulleys (5) installed on the front of the vertical column of the frame. Meanwhile, a transmission structure (3) is sleeved on the other three sets of fixed pulleys (5). The two ends of the linkage rope (8) are respectively connected to the front ends of two sets of connecting rods (6). Link (6), the link (6) is configured in two sets, the front end of the link (6) is fixed with a foot pedal (7), and the link (6) is connected to the transmission structure (3); The rear wheel (1) is configured as two, and the two rear wheels (1) are respectively installed on the outside of the rear wheel axle (9).

2. The fitness leg-training tricycle according to claim 1, characterized in that: The transmission structure (3) is a rope transmission. The transmission rope is a three-section rope. The middle section of the transmission rope is an elastic rope, and the two sides of the elastic rope are non-elastic ropes. The transmission structure (3) includes a winding drive part (31), a pulley drive part (32), a connecting part (33), and an elastic tension end (34). The winding drive part (31), the pulley drive part (32), and the connecting part (33) are all set in two groups. The two groups of winding drive parts (31) are respectively installed on the flywheels (2) located on both sides of the rear wheel (1). The two groups of pulley drive parts (32) are respectively installed on the fixed pulleys (5) located on both sides of the top of the middle part of the frame (4). The lower ends of the two groups of connecting parts (33) are respectively installed on the adjusting blocks (61) of the two connecting rods (6). The elastic tension end (34) is installed on the fixed pulley (5) located on the lower side of the frame (4).

3. The fitness leg-training tricycle according to claim 2, characterized in that: The number of turns of the winding drive part (31) is at least one set, and the winding drive part (31) is directly wound on the flywheel (2). At the same time, when the static friction transmission is insufficient, the rope point of the winding drive part (31) is fixedly installed on the flywheel (2).

4. The fitness leg-training tricycle according to claim 1, characterized in that: The transmission structure (3) is a chain drive, and the structure is three-section or five-section. The middle section is an elastic rope, and the two sides of the elastic rope are bicycle chains. The five-section transmission structure (3) is a bicycle chain with an additional section of non-elastic rope. The length of the bicycle chain on the five-section transmission structure (3) is less than the length of the bicycle chain on the three-section transmission structure (3). This transmission structure (3) is a composite structure composed of an elastic rope and a bicycle chain. The bicycle chain on the transmission structure (3) meshes with the corresponding chain flywheel (2), and the two ends are respectively installed on the adjusting blocks (61) of the two corresponding connecting rods (6) after passing through the corresponding fixed pulleys (5). The fixed pulleys (5) are the corresponding grooved wheels or chain wheels.

5. The fitness leg-training tricycle according to claim 1, characterized in that: The flywheel (2) is groove-shaped with vertical guards on both sides. There are mounting holes on the vertical guards. The middle part of the elastic rope of the transmission structure (3) passes through the fixed pulley (5) installed on the lower side of the frame (4). After winding around the flywheel a certain number of times, the two ends are connected to the inner holes of the two flywheels respectively. One end of the non-elastic rope of the transmission structure (3) is connected to the outer hole of the flywheel. After winding around the flywheel a certain number of times, it passes through the fixed pulleys (5) located on both sides of the top of the middle part of the frame (4) and is installed on the adjusting blocks (61) of the two connecting rods (6) respectively.

6. The fitness leg-training tricycle according to claim 1, characterized in that: The frame (4) has a spindle, and a fixed pulley (5) is installed on the spindle. A pulley guard (12) is installed on the outside of the fixed pulley (5). The pulley guard (12) is installed on the spindle of the fixed pulley (5) by screws. The end of the connecting rod (6) is installed on the rear wheel axle (9). Bearings are installed between the spindle and the pulley seat hole, and between the connecting rod (6) and the rear wheel axle (9).

7. The fitness leg-training tricycle according to claim 1, characterized in that: The connecting rod (6) includes an adjusting block (61), a connecting rod body (62), a cable (63), and a compression spring (64). The size of the adjusting block (61) is adapted to that of the connecting rod body (62). The adjusting block (61) is slidably mounted on the connecting rod body (62). At the same time, the compression spring (64) is sleeved on the outside of the connecting rod body (62) and is installed in contact with the adjusting block (61). The cable (63) is connected to the adjusting block (61), and the other end of the cable (63) is connected to the shift lever (11) mounted on the handlebars of the frame.

8. The fitness leg-training tricycle according to claim 1, characterized in that: A slider is installed below the frame (4) and an elastic element is connected to it. A fixed pulley (5) that contacts the elastic tension end (34) of the transmission structure (3) is installed on the slider. At this time, the middle section of the transmission structure (3) may not have elasticity.

9. The fitness leg-training tricycle according to claim 1, characterized in that: The frame (4) is equipped with a connecting rod stop (10), and the connecting rod stop (10) is adjustable up and down.

10. A fitness leg-training tricycle according to any one of claims 1-9, characterized in that: The frame (4) is equipped with a handlebar, and a shift lever (11) is installed on the handlebar. The shift lever (11) can retract the cable (63) to change the position of the adjusting block (61) on the connecting rod body (62) to achieve speed change.

Images