A lever-driven bicycle with easy gear shifting

Abstract

A lever drive bicycle with convenient gear shifting relates to a bicycle, two levers (1) are arranged, and are fixed at two ends of a lever shaft (4), a steel rope is sleeved on a safety buckle through a slide wheel, the slide wheel is fixed on a rear inclined frame of a seat (7), the safety buckle is fixed on the lever (1), three shifters are fixed on a semicircular channel steel at an end of a frame, and three gearboxes are connected in series on the lever shaft (4); a sleeve is fixed on a stay, and the stay is fixed on the slide wheel; a shift key (11) is connected with the shifters and the slide wheel, the sleeve is clamped on a gear; a batten is fixed on a fixed disc; the batten is reservedly connected with a threaded rod (32) through a perforation, the threaded rod is fixed on the end of the frame, the sleeve can be clamped on one gear and cannot be clamped on two or three gears at the same time; the gear shift and the wheel are coaxial, the space is reduced, the structure is simplified, the gear shift is convenient, and the bicycle is more suitable for climbing and accelerating.

Description

Technical Field

[0001] This utility model relates to a bicycle, and more particularly to a lever-driven bicycle that facilitates gear shifting. Background Technology

[0002] Bicycles are a physically demanding mode of transportation. While they have undergone significant development and evolution with societal progress, they still fall short of the demands of today's fast-paced world. The drawbacks of chain-driven bicycles include insufficient power and a limited crank length, both of which affect the bicycle's performance. The power of a chain-driven bicycle comes from the crank's 170mm-175mm length, which restricts the maximum torque produced, thus impacting speed. Chain-driven bicycles utilize only about 50% of the rider's physical strength, and the crank's rotation causes torque to fluctuate from 0% to 100%, hindering long-distance travel. Furthermore, the chain is prone to falling off or breaking, making repairs inconvenient.

[0003] Currently, there are existing lever-driven bicycles, such as the one announced in CN 215944802 U on March 4, 2022, which facilitates gear shifting. However, lever-driven bicycles have defects in terms of gear transmission, such as: 1. When shifting gears on a bicycle, the clip slides onto the gear assembly and gets stuck between the axle and the gear, rotating simultaneously. The clip's length is insufficient to withstand the strong force, leading to damage to both the clip and the axle. Another problem is that the clip may not engage with the gear assembly promptly during gear shifting, causing the bicycle to slow down.

[0004] 2. Welding the internal gear to the disc in a bicycle causes deformation of the disc, affecting the concentricity between the internal gear and the central gear, and generating resistance during rotation.

[0005] 3. The pin and the transmission hole of the fixed plate are welded together with the pin shaft, which results in a large perpendicularity between the pin and the fixed plate, affecting the rotation of the transmission gear on the pin shaft, and making the combined transmission structure large and heavy.

[0006] The aforementioned problems need to be further corrected in order to produce qualified products. Summary of the Invention

[0007] The purpose of this invention is to provide a lever-driven bicycle with convenient gear shifting. The power of this new bicycle comes from the length of the lever, which is approximately three times the length of the crank, significantly increasing the bicycle's power. The end of the lever rotates in one direction and connects to both ends of the wheel axle. The lever's vertical swing is connected by a steel cable, and the height and amplitude of the lever's vertical swing are adjustable. The gear ratio can be changed according to needs. The gearbox's connection to the wheel axle reduces space and simplifies the structure. The gearbox facilitates shifting and is particularly beneficial for climbing hills and accelerating.

[0008] The objective of this utility model is achieved through the following technical solution: A lever-driven bicycle for easy gear shifting includes a lever, a steel cable, a derailleur, a lever shaft, pedals, a frame, a seat, a handbrake, a shift button, a rear fork, a front fork, a front wheel, a rear wheel, a rear wheel bearing mounting groove, a bearing, and a rear wheel axle. Disc brake pads, gearboxes, slide wheels, sleeves, shifters, screw rods, slats, fixed discs, center gears, internal gears, discs, and pull rods; the lever point of the lever bicycle is located on the lever axle; there are two levers, both fixed to the two ends of the lever axle; the steel cable passes through the slide wheel and is looped onto the safety buckle; the slide wheel is fixed to the slanted frame behind the seat; the safety buckle is fixed to the lever; three shifters are fixed to the semi-circular channel steel at the end of the frame; three gearboxes are connected in series on the lever axle; sleeves are fixed to the pull rods; the pull rods are fixed to the slide wheels; the shift key connects to the shifters and the slide wheels; the sleeve is clipped onto the gear; slats are fixed to the fixed disc; the slats have pre-drilled holes and are fixed to the screw rod; the screw rod is fixed to the end of the frame; only one sleeve can be clipped at a time, not two or three simultaneously; the lever axle and the rear wheel axle: the rear wheel is mounted on the rear wheel axle, using... The rear wheel axle is secured with a nut, and two bearings are fixed to the rear wheel axle, installed in the rear wheel bearing mounting slots. The rear wheel disc brake pads and transmission are mounted on the rear wheel axle. The lever shaft has a keyway with a pull bar inside. The lever shaft is installed at the center of the rear wheel axle, and three sliding wheels are mounted on the lever shaft. The three sliding wheels of the gear shifter are mounted on the lever shaft. The pull bar is connected to the sliding wheels. The three gear shifters are fixed to the rear wheel bearing mounting slots, and the sliding wheels move left and right synchronously with the lever shaft. The rear wheel axle of the transmission is fixed to one of the central gears, the internal gear is fixed to the disc, and the central gear is also fixed to the disc. The outer and inner fixed discs are fixed to the transmission gear via a pin shaft, and the transmission gear is located between the central gear and the internal gear. A slat is fixed to the outer fixed disc, and the slat has a pre-drilled hole and is fixed together with a screw. The screw is fixed to the rear wheel frame. One of the sleeves is fixed to one of the pull rods, and the pull rod is fixed to one of the slide wheels; the second sleeve is fixed to the second pull rod, and the second pull rod is fixed to the second slide wheel; the third sleeve is fixed to the third pull rod, and the third pull rod is fixed to the third slide wheel; the shift key is connected to one of the shifters, and connected to the third slide wheel; the third sleeve is engaged with the fourth central gear; the second shifter is connected to the second slide wheel, and the second sleeve is engaged with the third central gear; the third shifter is connected to one of the slide wheels, and the first sleeve is engaged with the second central gear.

[0009] The aforementioned lever-driven bicycle, which facilitates gear shifting, has its steel cable secured with loops at both ends and then mounted on a safety buckle via a slide wheel.

[0010] The lever-driven bicycle with convenient gear shifting has the following dynamic gear structure: When the second central gear rotates one revolution, the first internal gear rotates one revolution simultaneously; when the first internal gear rotates one revolution, the first central gear rotates 2.5 revolutions; when the third central gear rotates one revolution, the second internal gear rotates one revolution simultaneously; when the second internal gear rotates one revolution, the second central gear rotates 2.5 revolutions; when the three gearboxes are connected in series, the third central gear rotates one revolution, and the first central gear rotates 4.2 revolutions; when the fourth central gear rotates one revolution, the third internal gear rotates one revolution simultaneously; when the third internal gear rotates one revolution, the third central gear rotates 2.5 revolutions; when the three gearboxes are connected in series, the fourth central gear rotates one revolution, and the first central gear rotates 7.2 revolutions.

[0011] The aforementioned lever-driven bicycle for easy gear shifting and speed change includes a slat that is fixedly connected to a first outer fixed plate, a second slat that is fixedly connected to a second outer fixed plate, and a third slat that is fixedly connected to a third outer fixed plate.

[0012] The aforementioned lever-driven bicycle facilitates gear shifting, wherein one of the pull rods is connected to one of the slide wheels, another pull rod is connected to a second slide wheel, and a third pull rod is connected to a third slide wheel.

[0013] The aforementioned lever-driven bicycle facilitates gear shifting and speed change, wherein one of the internal gears is fixedly connected to one of the discs, a second central gear is fixedly connected to one of the discs, a second internal gear is fixedly connected to a second disc, a third central gear is fixedly connected to a second disc, a third internal gear is fixedly connected to a third disc, and a fourth central gear is fixedly connected to a third disc.

[0014] The lever-driven bicycle, which facilitates gear shifting, has keyways on the second, third, and fourth central gears, and a sleeve that moves within the keyways.

[0015] The aforementioned lever-driven bicycle for easy gear shifting and speed change includes a slat that is fixedly connected to a first outer fixed plate, a second slat that is fixedly connected to a second outer fixed plate, and a third slat that is fixedly connected to a third outer fixed plate.

[0016] The advantages and effects of this utility model are: 1. This utility model of a lever bicycle can increase torque. The lever length can be selected between 550 and 650 mm to meet specific needs, enabling the bicycle to obtain greater power. The bicycle's power comes from the lever length, which is approximately three times the length of the crank, significantly increasing the bicycle's power.

[0017] 2. The end of the new lever of this utility model is unidirectionally rotating and connected to both ends of the wheel axle. The lever swings up and down by a steel rope, and the height of the center of the lever swings up and down and the amplitude of the lever swings up and down are adjustable.

[0018] 3. The new lever bicycle of this utility model has a physical energy utilization rate of over 95%. The lever swings up and down to generate bicycle torque, which varies from 95% to 100% (min), greatly improving the physical energy utilization rate and providing more cycling enthusiasts with convenient transportation for long-distance travel.

[0019] 4. Without a gearbox, the wheel would rotate approximately once every 4.5 pedal strokes in this utility model lever bicycle. Therefore, three gearboxes have been added to facilitate gear shifting and increase speed.

[0020] 5. The novel lever-type bicycle gearbox of this utility model, which is connected to the wheel shaft, reduces space and simplifies the structure. The gearbox is easy to shift and is more suitable for climbing hills and accelerating. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the novel lever bicycle of this utility model; Figure 2 This is a schematic diagram of the novel lever shaft and rear wheel shaft structure of this utility model; Figure 3 This is a schematic diagram of the structure of the novel gear shifter of this utility model; Figure 4 This is a schematic diagram of the structure of the novel combined transmission of this utility model; Figure 5 This is a schematic diagram of the external fixing disc structure of this utility model; Figure 6 This is a schematic diagram of the internal fixing disc structure of this utility model; Figure 7 This is a schematic diagram of the structure of the disk, central gear, and internal gear of this utility model; Figure 8 This is a schematic diagram of the structure of the disk, central gear, and internal gear of this utility model; Figure 9 This is a schematic diagram of the gear and sleeve structure of this utility model; Figure 10 This is a comparison diagram of the lever torque and crank torque of this utility model.

[0022] Components shown in the diagram: 1. Lever; 2. Steel cable; 3. Combination gearbox; 4. Lever shaft; 5. Pedal; 6. Frame; 7. Seat; 8. Handbrake; 9. Shift button; 10. Rear fork; 11. Front fork; 12. Front wheel; 13. Rear wheel bearing mounting groove; 14. Front disc brake pad; 15. Left bearing; 16. Right bearing; 17. Rear wheel axle; 18. Rear disc brake pad; 19. Gearbox 1; 20. Gearbox 2; 21. Gearbox 3; 22. Slide wheel 1; 23. Slide wheel 2; 24. Slide wheel 3; 25. Sleeve 1; 26. Sleeve 2; 27. Sleeve 3; 28. Gear shifter 1; 29. ​​Gear shifter 2; 30. Gear shifter 3; 31. Screw rod; 32. Slat 1; 33. Slat 2; 34. Slat 3; 35. Outer fixed plate 1; 36. Inner fixed plate 1; 37. Center gear 1; 38. Inner gear 1; 39. Disc 1; 4 0. Second outer fixed plate 41. Second inner fixed plate 42. Second center gear 43. Second inner gear 44. Second disc 45. Third outer fixed plate 46. Third inner fixed plate 47. Third center gear 48. Third inner gear 49. Third disc 50. Fourth center gear 51. First pull bar 52. Second pull bar 53. Third pull bar 54. Screw hole 55. Gear hole 56. Another gear hole 57. Disc component 58. Inner gear component 59. Center gear component 60. Sleeve component 61. Gear component 62. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings.

[0024] like Figure 1As shown, this novel lever bicycle has two levers, one on the left and one on the right, both fixed to the two ends of the lever shaft 4. The lever shaft 4 rotates by the up-and-down swing of the steel cable 2. The steel cable passes through a slide wheel and is looped onto a safety buckle. The slide wheel is fixed to the rear slanted frame of the seat 7. The safety buckle is fixed to the lever 1. The two ends of the steel cable 2 are secured with loops that pass through the slide wheel and are looped onto the safety buckle. Gear shifters 1 (29), 2 (30), and 3 (31) are fixed to the semi-circular channel steel at the end of the frame. Sleeve 1 (26) is fixed to pull bar 1 (52), which is fixed to slide wheel 1 (23). Sleeve 2 (27) is fixed to pull bar 2 (53), which is fixed to slide wheel 2 (24). Sleeve 3 (28) is fixed to pull bar 3 (54), which is fixed to slide wheel 3 (25). Under the control of shift key 11, shifter one 29 is stretched and moved, slide wheel three 25 is stretched and moved, causing sleeve three 28 to be locked onto central gear four 51. When shifter two 30 is stretched and moved, slide wheel two 24 is stretched and moved, causing sleeve two 27 to be locked onto central gear three 48. When shifter three 31 is stretched and moved, slide wheel one 23 is stretched and moved, causing sleeve one 26 to be locked onto central gear two 43. Gearbox 1 (20), Gearbox 2 (21), and Gearbox 3 (22) are connected in series on lever shaft 4. For example: when center gear 2 (43) rotates one revolution, internal gear 1 (39) rotates one revolution simultaneously; when internal gear 1 (39) rotates one revolution, center gear 1 (38) rotates 2.5 revolutions; when center gear 3 (48) rotates one revolution, internal gear 2 (44) rotates one revolution simultaneously; when internal gear 2 (44) rotates one revolution, center gear 2 (43) rotates 2.5 revolutions. When gearboxes 1 (20) and 2 (21) are connected in series, when center gear 3 (48) rotates one revolution, center gear 1 (38) rotates 4.2 revolutions; when center gear 4 (51) rotates one revolution... The inner gear 3 (49) rotates one revolution simultaneously; when the inner gear 3 (49) rotates one revolution, the central gear 3 (48) rotates 2.5 revolutions; gearboxes 1 (20), 21, and 22 (22) are connected in series. When in use, the central gear 4 (51) rotates one revolution, and the central gear 1 (38) rotates 7.2 revolutions; slat 1 (33) is fixed to outer fixed plate 1 (36), slat 2 (34) is fixed to outer fixed plate 2 (41), and slat 3 (35) is fixed to outer fixed plate 3 (46). The slats are fixed to screw rods 32 through pre-drilled holes. The screw rods are fixed to the end of the frame. Only one sleeve can be secured; two or three sleeves cannot be secured simultaneously.

[0025] like Figure 2 As shown, the lever axle and rear wheel axle are explained as follows: The rear wheel 13 is mounted on the rear wheel axle 18 and secured with a nut. Two bearings are fixed on the rear wheel axle and installed in the rear wheel bearing mounting groove. The rear wheel disc brake pad 19 is mounted on the rear wheel axle, and the gearbox is mounted on the lever shaft. The lever shaft 4 has a keyway with a pull bar inside. The lever shaft 4 is mounted at the center of the rear wheel axle. Slide wheel 1 23, slide wheel 24, and slide wheel 3 25 are mounted on the lever shaft 4. Lever 1 is mounted at both ends of the lever shaft 4.

[0026] like Figure 3 As shown, the gear shifter is described below: Slide wheel 1 (23), slide wheel 2 (24), and slide wheel 3 (25) are mounted on lever shaft 4. Pull bar 1 (52) is connected to slide wheel 1 (23), pull bar 2 (53) is connected to slide wheel 2 (24), and pull bar 3 (54) is connected to slide wheel 3 (25). Gear shifter 1 (29), gear shifter 2 (30), and gear shifter 3 (31) are fixed on the rear wheel bearing mounting groove. The slide wheels move left and right and rotate synchronously with the lever shaft.

[0027] like Figure 4 The diagram shows the transmission. The rear wheel axle 18 is connected to one of the central gears 38; one of the internal gears 39 is interlocked with one of the discs 40; the second central gear 43 is fixed to one of the discs 40; the second internal gear 44 is interlocked with one of the discs 45; the third central gear 48 is fixed to one of the discs 45; the third internal gear 49 is interlocked with one of the discs 50; and the fourth central gear 51 is fixed to one of the discs 50. The outer and inner fixed discs are fixed to the transmission gears via pins. The transmission gears are located between the central gear and the internal gear. For example, when the second central gear 43 rotates one revolution, the first central gear 3... 8 rotates 2.5 revolutions; when center gear 3 48 rotates once, center gear 1 38 rotates 4.2 revolutions; when center gear 4 51 rotates once, center gear 1 38 rotates 7.2 revolutions; center gear 2 43, center gear 3 48, and center gear 4 51 are provided with keyways, and the sleeve moves in and out of the keyways; slat 1 33 is fixed on outer fixed plate 1 36, slat 2 34 is fixed on outer fixed plate 2 41, and slat 3 35 is fixed on outer fixed plate 3 46; the slats have reserved holes and are fixed together with screws 32, and the screws are fixed on the rear wheel frame.

[0028] Figure 5 This is a schematic diagram of the external and internal fixing discs of this utility model.

[0029] It consists of screw hole 55, gear hole 56, another gear hole 57, and disc part 58; the 6 transmission holes are connected together by a pin, and the end of the pin is fixed with a snap ring or nut.

[0030] The gear holes and screw holes of the inner and outer fixed plates are the same, except that the six transmission holes are fixed together with pins, and the transmission gears rotate on the pins. The outer fixed plate is fixed to the inner fixed plate with screws, and the six transmission gears rotate on the pins, which greatly improves the rotation efficiency of the transmission gears.

[0031] Figure 6 and Figure 7 This is a schematic diagram of the novel disc, central gear, and internal gear structure of this utility model; Figure 6 , Figure 7 The internal gear 59 and the disc 58 are connected by a loose snap (slightly loose), which solves the problem of welding affecting rotation; the internal gear 59 and the center gear 60 are connected by a loose snap, the center gear 60 is fixed to the disc 58, and the internal gear 59 also rotates once when the center gear 60 rotates one revolution.

[0032] Figure 8 This is a schematic diagram of the novel gear and sleeve structure of this utility model; Figure 8 The bicycle gear shifter uses a sleeve with four levers, which solves the problem of damage to shaft 4 and allows for timely gear shifting, enabling the bicycle to continue moving. Gear component 62 and sleeve component 61 Figure 8 Note: The sleeve 61 is connected to the pull bar by a thin steel rope through a hole. When the sleeve enters the gear 62, the lever shaft 4 and the gear rotate together.

[0033] Figure 9 This is a comparison diagram of the lever torque and crank torque of this utility model. The crank rotation causes the torque to vary from 0% to 100%, while the lever torque varies from 95% to 100%, which shows that it improves the utilization rate of physical energy.

[0034] This novel lever bicycle features a lever point design on the lever shaft, which reduces structural space. The lever length is three times longer than the crank length of a chain bicycle, resulting in a three-fold increase in power. While the crank rotation of a chain bicycle allows torque to vary from 0% to 100%, utilizing 50% of physical exertion, the lever bicycle's torque variation ranges from 95% to 100%, significantly improving physical exertion utilization. The newly designed gearboxes, such as individual gear ratios of 2.5, 1.7, and 1.7, combined in series, achieve a total gear ratio of 7.2. This allows for easier shifting between low, medium, and high speeds, making climbing and acceleration easier and better showcasing the advantages of the lever bicycle.

[0035] In a lever bicycle, the two levers 1 are connected to both ends of the lever shaft 4, resulting in a more balanced torque. This allows for a wider design range for the frame 6 and appropriate structural modifications. The combination gearbox 3 and shifter are mounted on both sides of the lever shaft 4, reducing the left-right center point deviation. If the levers were designed at one end of the lever shaft, it would exceed the design range of the frame 6, leading to a larger left-right center point deviation. Therefore, the lever shaft 4 is designed at the center of the rear wheel axle 18. Even with this design, the lever bicycle still performs the same function.

Claims

1. A lever-driven bicycle for easy gear shifting, comprising a lever, a steel cable, a gearbox, a lever shaft, pedals, a frame, a seat, a handbrake, a shift button, a rear fork, a front fork, a front wheel, a rear wheel, a rear wheel bearing mounting groove, a bearing, a rear wheel axle, a disc brake pad, a gearbox, a sliding wheel, a sleeve, a shifter, a screw rod, a slat, a fixed disc, a center gear, an internal gear, a disc, and a pull rod; characterized in that, The lever point of the lever bicycle is located on the lever shaft; there are two levers (1), both fixed at both ends of the lever shaft (4). The steel rope is looped onto the safety buckle through the slide wheel. The slide wheel is fixed to the slanted frame behind the seat (7). The safety buckle is fixed to the lever (1). Three gear shifters are fixed to the semi-circular channel steel at the end of the frame. Three gearboxes are connected in series on the lever shaft (4). The sleeve is fixed to the pull bar. The pull bar is fixed to the slide wheel. The shift key (11) is connected to the gear shifter and the slide wheel. The sleeve is clamped onto the gear. The slat is fixed to the fixed plate. The slat is fixed to the screw rod (32) with a pre-drilled hole. The screw rod is fixed to the screw rod. At the end of the frame; the lever shaft and the rear wheel (13) of the rear wheel axle are mounted on the rear wheel axle (18) and fixed with nuts. Two bearings are fixed on the rear wheel axle and installed in the rear wheel bearing fixing groove. The rear wheel disc brake pad (19) and the gearbox are mounted on the rear wheel axle. The lever shaft (4) is provided with a keyway and a pull bar is provided in the keyway. The lever shaft (4) is installed at the center of the rear wheel axle. Three sliding wheels are mounted on the lever shaft (4). The three sliding wheels of the shifter are mounted on the lever shaft (4). The pull bar is connected to the sliding wheels. The three shifters are fixed on the rear wheel bearing fixing groove. The sliding wheels move left and right and rotate synchronously with the lever shaft. The gearbox rear wheel axle (18) is mounted together with one of the central gears (38), the internal gear is connected to the disc, and the central gear is also fixed to the disc; the outer fixed disc and the inner fixed disc are fixed to the transmission gear via a pin shaft, and the transmission gear is between the central gear and the internal gear; the slat is fixed to the outer fixed disc, and the slat has a reserved hole and a screw rod (32) connected together, and the screw rod is fixed to the rear wheel frame; one of the sleeves (26) is fixed to one of the tie rods (52), and one of the tie rods (52) is fixed to one of the slide wheels (23); the second sleeve (27) is fixed to the second tie rod (53), and the second tie rod (5... 3) Fixed on the second slide wheel (24); the third sleeve (28) is fixed on the third pull bar (54), and the third pull bar (54) is fixed on the third slide wheel (25); the shift key (11) is connected to the first shifter (29), connected to the third slide wheel (25), and the third sleeve (28) is locked on the fourth central gear (51); the second shifter (30) is connected to the second slide wheel (24), and the second sleeve (27) is locked on the third central gear (48); the third shifter (31) is connected to the first slide wheel (23), and the first sleeve (26) is locked on the second central gear (43); The dynamic configuration of the gear structure is as follows: when the second central gear (43) rotates once, the first internal gear (39) rotates once simultaneously; when the first internal gear (39) rotates once, the first central gear (38) rotates 2.5 times; when the third central gear (48) rotates once, the second internal gear (44) rotates once simultaneously; when the second internal gear (44) rotates once, the second central gear (43) rotates 2.5 times; when the three gearboxes are connected in series, the third central gear (48) rotates once, and the first central gear (38) rotates 4.2 times; when the fourth central gear (51) rotates once, the third internal gear (49) rotates once simultaneously; when the third internal gear (49) rotates once, the third central gear (48) rotates 2.5 times; when the three gearboxes are connected in series, the fourth central gear (51) rotates once, and the first central gear (38) rotates 7.2 times. One of the slats (33) is fixed to one of the outer fixing plates (36), the second slat (34) is fixed to the second outer fixing plate (41), and the third slat (35) is fixed to the third outer fixing plate (46).

2. A lever-driven bicycle for easy gear shifting according to claim 1, characterized in that, The steel rope (2) is secured at both ends with loops and then fitted onto the safety buckle via a slide wheel.

3. A lever-driven bicycle for easy gear shifting according to claim 1, characterized in that, One of the pull bars (52) is connected to one of the slide wheels (23), the second pull bar (53) is connected to the second slide wheel (24), and the third pull bar (54) is connected to the third slide wheel (25).

4. A lever-driven bicycle for easy gear shifting according to claim 1, characterized in that, One of the internal gears (39) is fixedly connected to one of the disks (40), the second central gear (43) is fixedly connected to one of the disks (40), the second internal gear (44) is fixedly connected to the second disk (45), the third central gear (48) is fixedly connected to the second disk (45), the third internal gear (49) is fixedly connected to the third disk (50), and the fourth central gear (51) is fixedly connected to the third disk (50).

5. A lever-driven bicycle for easy gear shifting according to claim 1, characterized in that, The second (43), third (48), and fourth (51) central gears are provided with keyways, and the sleeve moves within the keyways.

6. A lever-driven bicycle for easy gear shifting according to claim 1, characterized in that, One of the strips (33) is fixed to one of the outer fixing plates (36), the second strip (34) is fixed to the second outer fixing plate (41), and the third strip (35) is fixed to the third outer fixing plate (46).

7. A lever-driven bicycle for easy gear shifting according to claim 1, characterized in that, The lever bicycle has a combination gearbox (3) and a shifter mounted on both sides of the lever shaft (4), which is located at the center of the rear wheel axle (18).

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