Labor-saving tricycle

Abstract

The present application belongs to the technical field of human-powered bicycles, and particularly relates to a labor-saving tricycle, which comprises a frame, a front wheel, a rear wheel set, a seat assembly and a control system. The frame is in the form of a long strip-shaped frame structure, the front end of which is provided with the front wheel, and the rear end of which is symmetrically provided with two rear wheels. The seat assembly is installed at the middle part of the frame. The rear wheel set comprises a rear axle, a rear axle small chain wheel and a rear axle chain. The rear wheels are arranged at the two ends of the rear axle, and the rear axle is provided with a ball bearing near the left rear wheel. The present application is particularly provided with a ball bearing near the left rear wheel of the rear axle. The core purpose of this design is to break the forced linkage state of the two rear wheels caused by the rigid connection of the traditional rear axle. When the vehicle is performing a steering operation, the inner and outer rear wheels need different rotating speeds due to the difference in the driving path. The existence of the ball bearing enables the two rear wheels to rotate independently, effectively eliminates the tire dragging and skidding phenomenon when turning, and greatly reduces the steering resistance.

Description

Technical Field

[0001] This invention belongs to the field of human-powered bicycle technology, specifically relating to a labor-saving tricycle. Background Technology

[0002] Three-wheeled bicycles are widely used in elderly mobility, short-distance cargo transportation, and leisure and fitness activities due to their good stability and strong load-bearing capacity.

[0003] Traditional tricycles typically use a chain-driven rear axle structure, where pedaling power is transmitted to the rear axle via the chain, causing the two rear wheels to rotate synchronously. However, this traditional structure has significant drawbacks: First, because the two rear wheels are rigidly connected to the same rear axle, the inner and outer wheels have different travel radii when turning, resulting in inconsistent wheel speeds. This leads to tire slippage, increased wear, and high steering resistance, severely impacting handling agility and riding comfort. Second, traditional tricycles have a fixed gear ratio, requiring riders to exert considerable pedaling force when starting and climbing hills. For those with less physical strength (such as the elderly), this is a heavy burden and lacks energy-saving benefits.

[0004] Therefore, this invention is proposed. Summary of the Invention

[0005] To address the technical problems existing in the prior art, the present invention provides a labor-saving tricycle.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A labor-saving tricycle includes a frame, a front wheel, a rear wheel assembly, a seat assembly, and a control system. The frame has a long, narrow frame structure with a front wheel at the front end and two rear wheels symmetrically arranged at the rear end. The seat assembly is installed in the middle of the frame. The control system includes handlebars and a force-saving mechanism. The handlebars are connected to the front end of the frame via a steering stem to achieve steering control of the front wheel. The force-saving mechanism includes an ultra-long lever, a first pivot, and a second pivot. The ultra-long lever consists of a first ultra-long lever and a second ultra-long lever. One end of the first ultra-long lever and the second ultra-long lever are connected to a crank on the pedals, and the other end is connected to the first pivot. The first pivot is equipped with a large driving gear, which is positioned between the first ultra-long lever and the second ultra-long lever. The second pivot is equipped with a passive clockwise rotating pinion and a clockwise rotating large sprocket. The large driving gear and the passive clockwise rotating pinion mesh to transmit pedaling force to the rear wheel assembly to drive the vehicle forward. The rear wheel assembly includes a rear axle, a rear axle sprocket, and a rear axle chain. The rear axle sprocket is sleeved on the rear axle, and the rear axle chain is coaxially engaged on the rear axle. The clutch sprocket is connected to the rear axle via the rear axle sprocket and the rear axle chain. The rear wheels are located at both ends of the rear axle, and ball bearings are provided on the rear axle near the left rear wheel.

[0007] The frame is equipped with a foot pedal drive mechanism, which includes a foot pedal, a crank, a connecting rod, and a stacked gear set arranged symmetrically on the left and right. The foot pedal is connected to the connecting rod through the crank. One end of the connecting rod is hinged to the crank, and the other end is connected to the meshing gear in the stacked gear set.

[0008] A buffer mechanism is provided at the connection between the first ultra-long lever and the second ultra-long lever and the first rotating shaft. The buffer mechanism includes a bearing, and bushings are provided on both sides of the bearing. The bearing is provided with a first protrusion, a buffer spring and a buffer element. The two ends of the buffer spring are fixedly connected to the first protrusion and the buffer element respectively. A second protrusion is provided on the inner ring surface of the buffer mechanism. One end of the buffer element is rotatably set with the bushing, and the other end is engaged with the second protrusion.

[0009] The cross-sections of the first and second protrusions are triangular.

[0010] The control system also includes a braking assembly, which includes a handbrake mounted on the handlebars and brake discs mounted on the two rear wheels. The handbrake is used to transmit braking force to the brake discs to achieve rear axle braking.

[0011] The seat assembly includes a gearbox and a backrest seat. The top of the gearbox is provided with a slide rail, and the bottom of the backrest seat is provided with a slide groove. The slide rail and the slide groove are configured to cooperate with each other.

[0012] The bottom of the backrest seat is equipped with a hand-tightening screw.

[0013] Both the first and second rotating shafts are housed within a gearbox, which also contains a storage battery.

[0014] The vehicle includes a body shell, with a front headlight, a rear headlight, a left turn signal, and a right turn signal respectively installed at the front and rear of the body shell; a photovoltaic panel is installed on the top of the body shell; and the battery is electrically connected to the front headlight, rear headlight, left turn signal, right turn signal, and photovoltaic panel.

[0015] The handlebars are equipped with a main power switch, front and rear headlight switches, left and right turn signal switches, and horn controls.

[0016] The beneficial effects of this invention are as follows: (1) In this application, a ball bearing is specially installed on the rear axle near the left rear wheel. The core purpose of this design is to break the forced linkage state of the two rear wheels caused by the rigid connection of the traditional rear axle. When the vehicle is turned, the inner and outer rear wheels need different speeds due to the difference in the driving path. The presence of the ball bearing allows the two rear wheels to rotate independently (i.e., to achieve non-linkage differential effect), effectively eliminating tire drag and slippage when turning, greatly reducing steering resistance, making the bicycle easier and more flexible to operate in narrow spaces or sharp turns, while reducing tire wear and extending service life. (2) Through a unique control system design, this application introduces a multi-stage transmission force-saving mechanism consisting of an "ultra-long lever", a first pivot, a large active gear, a small passive gear, and a large sprocket. By using an ultra-long lever to increase the lever arm length and optimizing the meshing transmission ratio of the large and small gears, the rider's pedaling force is efficiently amplified and transmitted to the rear wheel assembly. This design significantly reduces the pedaling force required for starting and climbing, achieving true "force-saving" riding, and is especially suitable for people with limited physical strength. In addition, the setting of the buffer mechanism (including buffer springs, convex engagement, etc.) further absorbs the impact vibration during pedaling, making the power output smoother.

[0017] (3) This application integrates the first shaft, the second shaft and the battery into the gearbox under the seat assembly, which not only protects the core transmission components from external environmental corrosion, but also optimizes the overall vehicle center of gravity distribution; in conjunction with the photovoltaic panel set on the top of the vehicle body, it can realize green charging of the battery, thereby powering the front and rear headlights, turn signals and horn, and constructing a complete self-sufficient electrical system; in addition, the adjustable design of the backrest seat through the sliding rail and hand-tightening screw, as well as the perfect braking assembly, makes the tricycle not only meet the core requirements of labor saving and easy steering, but also has comfort, safety and environmental protection, and has extremely high practical value and promotion prospects. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a labor-saving tricycle according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a labor-saving tricycle according to the present invention. Figure 2 ; Figure 3 This is a partial structural diagram of a labor-saving tricycle according to the present invention. Figure 1 ; Figure 4 This is a partial structural diagram of a labor-saving tricycle according to the present invention. Figure 2 ; Figure 5 for Figure 4 Enlarged view of the structure of section A; Figure 6This is a partial structural diagram of a labor-saving tricycle according to the present invention. Figure 3 ; Figure 7 This is a partial structural diagram of a labor-saving tricycle according to the present invention. Figure 4 ; Figure 8 This is a partial structural diagram of a labor-saving tricycle according to the present invention. Figure 5 ; Figure 9 This is a partial structural diagram of a labor-saving tricycle according to the present invention. Figure 6 ; Figure 10 This is a partial structural diagram of a labor-saving tricycle according to the present invention. Figure 7 ; Figure 11 This is a partial structural diagram of a labor-saving tricycle according to the present invention. Figure 8 ; The components are labeled as follows: 1. Frame; 2. Front wheel; 31. Rear axle; 32. Rear axle sprocket; 33. Rear axle chain; 34. Ball bearing; 41. Gearbox; 42. Seat back; 43. Slide rail; 44. Slide groove; 45. Tightening screw; 5. Rear wheel; 61. Handlebar; 62. Steering stem; 71. Pedal; 72. Crank; 73. Connecting rod; 74. Gear set; 81. First ultra-long lever; 82. Second ultra-long lever; 83. First pivot; 84. Second pivot; 91. Drive gear; 92. 831. Passive clockwise rotating pinion; 832. Bearing; 833. Bushing; 834. First protrusion; 835. Buffer spring; 836. Buffer component; 847. Second protrusion; 85. Clockwise rotating large sprocket; 9. Buffer mechanism; 10. Handbrake component; 11. Brake disc; 12. Body shell; 13. Headlight; 14. Rear headlight; 15. Left turn signal; 16. Right turn signal; 17. Photovoltaic panel; 18. Battery; 21. Main power switch; 22. Front and rear headlight switch; 23. Left and right turn signal switch; 24. Horn control component. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments.

[0020] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this invention.

[0021] like Figures 1-11As shown, a labor-saving tricycle includes a frame 1, a front wheel 2, a rear wheel assembly, a seat assembly, and a control system. The frame 1 has a long, rectangular frame structure with a front wheel 2 at the front end and two rear wheels 5 symmetrically arranged at the rear end. The seat assembly is installed in the middle of the frame 1.

[0022] The control system includes handlebars 61 and a force-saving mechanism. The handlebars 61 are connected to the front end of the frame 1 via a steering stem 62 to achieve steering control of the front wheel 2. The force-saving mechanism includes an ultra-long lever, a first pivot 83, and a second pivot 84. The ultra-long lever includes a first ultra-long lever 81 and a second ultra-long lever 82. One end of the first ultra-long lever 81 and the second ultra-long lever 82 are connected to the crank 72 on the pedal 71, and the other end is connected to the first pivot 83. The first pivot 83 is equipped with a large driving gear 91, which is located between the first ultra-long lever 81 and the second ultra-long lever 82. The second pivot 84 is equipped with a passive clockwise rotating pinion 92 and a clockwise rotating large sprocket 841. The large driving gear 91 and the passive clockwise rotating pinion 92 are meshed together to transmit pedaling force to the rear wheel assembly to drive the vehicle forward. The control system also includes a braking assembly, which includes a handbrake 10 mounted on the handlebars 61 and brake discs 11 mounted on the two rear wheels. The handbrake 10 is used to transmit braking force to the brake discs 11 to achieve braking of the rear axle 31.

[0023] The rear wheel assembly includes a rear axle 31, a rear axle sprocket 32, and a rear axle chain 33. The rear axle sprocket sleeve 32 is mounted on the rear axle 31, and the rear axle chain 33 is coaxially engaged on the rear axle 31. The clutch-driven large sprocket 841 is connected to the rear axle sprocket 32 ​​and the rear axle chain 33. The rear wheels 5 are located at both ends of the rear axle 31, and a ball bearing 34 is provided on the rear axle 31 near the left rear wheel 5.

[0024] The frame 1 is equipped with a foot pedal drive mechanism, which includes a foot pedal 71, a crank 72, a connecting rod 73 and a stacked gear set 74 arranged symmetrically on the left and right. The foot pedal 71 is connected to the connecting rod 73 through the crank 72. One end of the connecting rod 73 is hinged to the crank 72, and the other end is connected to the meshing gear in the stacked gear set 74. A buffer mechanism 9 is provided at the connection between the first ultra-long force bar 81 and the second ultra-long force bar 82 and the first rotating shaft 83. The buffer mechanism 9 includes a bearing 831, bushings 832 on both sides of the bearing 831, a first protrusion 833, a buffer spring 834 and a buffer member 835 on the bearing 831. The two ends of the buffer spring 834 are fixedly connected to the first protrusion 833 and the buffer member 835 respectively. A second protrusion 836 is provided on the inner ring surface of the buffer mechanism 9. One end of the buffer member 835 is rotatably set with the bushing 832, and the other end is engaged with the second protrusion 836. The cross-sections of the first protrusion 833 and the second protrusion 836 are triangular.

[0025] The seat assembly includes a gearbox 41 and a backrest seat 42. The top of the gearbox 41 is provided with a slide rail 43, and the bottom of the backrest seat 42 is provided with a slide groove 44. The slide rail 43 and the slide groove 44 are fitted together. The bottom of the backrest seat 42 is provided with a hand-tightening screw 45. The first rotating shaft 83 and the second rotating shaft 84 are both located inside the gearbox 41, and the gearbox 41 also contains a battery 18.

[0026] The vehicle body 12 is equipped with a front headlight 13, a rear headlight 14, a left turn signal 15, and a right turn signal 16 at the front and rear, respectively; a photovoltaic panel 17 is installed on the top of the vehicle body 12; the battery 18 is electrically connected to the front headlight 13, the rear headlight 14, the left turn signal 15, the right turn signal 16, and the photovoltaic panel 17. The handlebars 61 are equipped with a main power switch 21, a front and rear headlight switch 22, a left and right turn signal switch 23, and a horn control unit 24.

[0027] The working principle is as follows: The cyclist sits on an adjustable backrest seat 42, with both feet pressing on symmetrical pedals 71. The pedaling force drives the connecting rod 73 via the crank 72, which in turn drives the sprocket gear set 74. The core force-saving process begins with the "ultra-long levers" (first and second ultra-long levers): the rotational motion of the pedals 71 is converted into the reciprocating up-and-down extension and retraction of the ultra-long levers. Due to the long lever arms, according to the lever principle, a small force applied at the input end (pedal) can generate a large torque at the output end.

[0028] The torque drives the first shaft 83 to rotate in one direction, which in turn drives the large drive gear 91 mounted on it. The large drive gear 91 meshes with the small passive gear 92 mounted on the second shaft 84, and through the speed-increasing or torque-optimized configuration of the "large gear driving small gear" (depending on the specific gear ratio design, here the focus is on effective force transmission and smoothness), power is transmitted to the second shaft 84. Subsequently, the large sprocket 841 mounted on the second shaft 84 drives the small sprocket 32 ​​mounted on the rear axle 31 to rotate via the rear axle chain 33, ultimately driving the rear axle 31 to rotate and propelling the vehicle forward. During this process, the buffer spring 834 in the buffer mechanism 9 cooperates with the lug to absorb the impact load at the moment of pedaling, making the power output smoother and gentler.

[0029] When the rider turns the handlebars 61, the steering stem 62 causes the front wheel 2 to deflect, changing the direction of the vehicle. At this time, the vehicle enters a turning state. The inner rear wheel 5 and the outer rear wheel 5 have different travel radii, and theoretically require different rotation speeds (outer wheel faster, inner wheel slower).

[0030] In traditional rigid axle tricycles, forced synchronous rotation of the two wheels can lead to tire slippage and steering difficulties. In this application, a ball bearing 34 is provided on the rear axle 31 near the left rear wheel 5. This ball bearing 34 acts as a key decoupling element, breaking the rigid torque lock-in relationship between the left and right rear wheels (or allowing one side to rotate relative to the axle / the other side).

[0031] When traveling in a straight line: power is evenly distributed through the chain or driven by friction to propel both wheels forward in sync.

[0032] When cornering: The ball bearing 34 allows the two rear wheels to automatically adjust their speed according to the ground resistance. The outer wheel has less resistance and rotates faster, while the inner wheel has greater resistance and rotates slower. The rolling friction of the ball bearing 34 replaces sliding friction, allowing the two wheels to rotate independently at different speeds (achieving a differential-like effect). This mechanism completely eliminates tire drag during cornering, significantly reduces steering resistance, and ensures that the vehicle maintains stable and agile handling in curves.

[0033] When slowing down or stopping is required, the rider squeezes the handbrake 10 located on the handlebars 61. Braking force is transmitted through brake cables (or hydraulic lines, which are existing technology and will not be described in detail) to brake discs 11 mounted on the two rear wheels 5. The brake pads clamp the brake discs 11 to generate friction, which acts directly on the rear wheels 5, achieving efficient braking of the rear axle 31. Because the rear wheels 5 have non-clutch characteristics, they can better adapt to road conditions during braking, preventing skidding caused by locking up one side.

[0034] The photovoltaic panel 17 on the roof of the vehicle converts solar energy into electrical energy under sunlight, which is stored in the battery 18 inside the gearbox 41. The rider can connect the circuit via the main power switch 21 on the handlebars 61 and control the corresponding lights using the front and rear headlight switches 22 and turn signal switches, providing illumination and signal indication for riding at night or in low visibility conditions; the horn control unit 24 is used to emit warning sounds. This system achieves energy self-sufficiency and intelligent management, improving the practicality and safety of the vehicle.

[0035] In summary, this application achieves labor-saving drive through a unique ultra-long lever transmission mechanism, cleverly solves the problem of differential speed when the tricycle is turning by utilizing the ball bearing 34 structure at the rear axle 31, and combines it with an integrated electrical system to jointly construct a new type of efficient, flexible and safe tricycle transportation tool.

[0036] It should be noted that the device structure and accompanying drawings of this invention mainly describe the principle of this invention. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, those skilled in the art can clearly understand the specifics of its power mechanism, power supply system and control system if they understand the principle of the invention. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments, or they can be used directly or indirectly, without departing from the principles and spirit of the invention. In other related technical fields, the scope of the invention is defined by the appended claims and their equivalents, and they are similarly included within the scope of patent protection of the invention.

Claims

1. A labor-saving tricycle, characterized in that: The vehicle includes a frame, front wheel, rear wheel assembly, seat assembly, and control system. The frame has a long, narrow frame structure with a front wheel at the front end and two rear wheels symmetrically arranged at the rear end. The seat assembly is installed in the middle of the frame. The control system includes handlebars and a force-saving mechanism. The handlebars are connected to the front end of the frame via a steering stem to achieve steering control of the front wheel. The force-saving mechanism includes an ultra-long lever, a first pivot, and a second pivot. The ultra-long lever consists of a first ultra-long lever and a second ultra-long lever. One end of the first ultra-long lever and the second ultra-long lever are connected to a crank on the pedals, and the other end is connected to the first pivot. The first pivot is equipped with a large driving gear, which is positioned between the first ultra-long lever and the second ultra-long lever. The second pivot is equipped with a passive clockwise rotating pinion and a clockwise rotating large sprocket. The large driving gear and the passive clockwise rotating pinion mesh to transmit pedaling force to the rear wheel assembly to drive the vehicle forward. The rear wheel assembly includes a rear axle, a rear axle sprocket, and a rear axle chain. The rear axle sprocket is sleeved on the rear axle, and the rear axle chain is coaxially engaged on the rear axle. The clutch sprocket is connected to the rear axle via the rear axle sprocket and the rear axle chain. The rear wheels are located at both ends of the rear axle, and ball bearings are provided on the rear axle near the left rear wheel.

2. The labor-saving tricycle as described in claim 1, characterized in that: The frame is equipped with a foot pedal drive mechanism, which includes a foot pedal, a crank, a connecting rod, and a stacked gear set arranged symmetrically on the left and right. The foot pedal is connected to the connecting rod through the crank. One end of the connecting rod is hinged to the crank, and the other end is connected to the meshing gear in the stacked gear set.

3. The labor-saving tricycle as described in claim 1, characterized in that: A buffer mechanism is provided at the connection between the first ultra-long lever and the second ultra-long lever and the first rotating shaft. The buffer mechanism includes a bearing, and bushings are provided on both sides of the bearing. The bearing is provided with a first protrusion, a buffer spring and a buffer element. The two ends of the buffer spring are fixedly connected to the first protrusion and the buffer element respectively. A second protrusion is provided on the inner ring surface of the buffer mechanism. One end of the buffer element is rotatably set with the bushing, and the other end is engaged with the second protrusion.

4. The labor-saving tricycle as described in claim 1, characterized in that: The cross-sections of the first and second protrusions are triangular.

5. The labor-saving tricycle as described in claim 1, characterized in that: The control system also includes a braking assembly, which includes a handbrake mounted on the handlebars and brake discs mounted on the two rear wheels. The handbrake is used to transmit braking force to the brake discs to achieve rear axle braking.

6. The labor-saving tricycle as described in claim 1, characterized in that: The seat assembly includes a gearbox and a backrest seat. The top of the gearbox is provided with a slide rail, and the bottom of the backrest seat is provided with a slide groove. The slide rail and the slide groove are configured to cooperate with each other.

7. The labor-saving tricycle as described in claim 6, characterized in that: The bottom of the backrest seat is equipped with a hand-tightening screw.

8. A labor-saving tricycle as described in claim 6, characterized in that: Both the first and second rotating shafts are housed within a gearbox, which also contains a storage battery.

9. A labor-saving tricycle as described in claim 8, characterized in that: The vehicle includes a body shell, with a front headlight, a rear headlight, a left turn signal, and a right turn signal respectively installed at the front and rear of the body shell; a photovoltaic panel is installed on the top of the body shell; and the battery is electrically connected to the front headlight, rear headlight, left turn signal, right turn signal, and photovoltaic panel.

10. A labor-saving tricycle as described in claim 1, characterized in that: The handlebars are equipped with a main power switch, front and rear headlight switches, left and right turn signal switches, and horn controls.

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