A swingable shaft drive tricycle

Abstract

A swingable shaft transmission tricycle comprises a front frame, a rear frame and a transmission mechanism, the front frame is connected with the rear frame through a swing mechanism, the transmission mechanism comprises a first torque output assembly arranged on the front frame and a second torque output assembly arranged on the rear frame, the first torque output assembly transmits torque to the second torque output assembly through a transmission shaft, and the second torque output assembly is connected with at least one of two rear wheels. The swingable shaft transmission tricycle provided by the application has the following advantages compared with the prior art: the problem that the transmission system needs to swing with the frame when the front frame and the rear frame swing in the prior art, resulting in poor transmission reliability, is solved; secondly, the problem that the chain is easily detached due to bumps and vibrations in the prior art, affecting the riding experience and even safety, is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tricycles, in particular to a swingable shaft transmission tricycle. BACKGROUND

[0002] Pedal tricycle is a common light transportation tool in daily life, which has the same lightness as bicycle and can load more articles. With the progress of technology, in order to save the physical strength of the rider, the electric power-assisted tricycle appears, which mainly relies on the torsion sensor at the crankshaft to detect the signal of the rotation of the crankshaft, and then the controller controls the motor to provide power for the driving wheel of the tricycle, thereby saving the physical strength of the rider. The power-assisted tricycle and the electric motorcycle tricycle have essential differences, such as different ways of controlling the rotation of the motor, the electric power-assisted tricycle does not set the throttle on the handlebar, the rider drives the crankshaft by pedaling, the crankshaft triggers the torsion sensor, thereby the controller controls the motor to drive the driving wheel of the tricycle, which is more reliable in safety.

[0003] The reason why the tricycle is easy to overturn when turning is mainly because when the tricycle turns, its center of gravity will shift to the front wheel and the outside rear wheel during turning, under the action of centrifugal force, the vehicle is very easy to tilt and overturn. At present, some countries have mandatory provisions that the rear width of the tricycle cannot be greater than the width of the front handlebar. Due to the size of the handlebar width cannot be too large, the wheelbase between the two rear wheels of the tricycle is narrow, and the two rear wheels are coaxially driven, which is very easy to tilt and overturn when turning. For example, there are two requirements for the tricycle in the foreign market. First, the total width of the tricycle is within 600mm. Second, the frame of the tricycle is composed of front and rear frames, the front frame needs to have axial left and right swing function when riding; the rear body is kept horizontal. When the tricycle turns, the front frame can twist at a certain angle relative to the rear frame, moving the center of gravity of the vehicle to the inside of the curve, so that the tricycle turns more stably and reliably. Since the front frame swings when riding, the traditional chain directly drives the rear wheel, the chain will twist in the shape of 8, and the twist distance of left and right twisting is different. It affects the safety of riding and is inconvenient for handlebar control. Therefore, this type of tricycle is designed as a multi-section transmission system. Figure 1 and Figure 2The three-wheeled vehicle comprises a front frame 101 and a rear frame 102, the rear frame 102 is provided with a downwardly extending support frame 1021, the support frame 1021 is provided with a swing mechanism 111; the front frame 101 is connected with the swing mechanism 111, a first transmission sprocket 103 is arranged on one side of the rear part of the front frame 101, a second transmission sprocket 104 is arranged on the other side of the front part of the rear frame 102, the first transmission sprocket 103 and the second transmission sprocket 104 are oppositely arranged and connected through a multi-stage universal joint 105, the first transmission sprocket 103 is in transmission connection with a driving sprocket 107 on the crankshaft of the front frame 101 through a first chain 106; the second transmission sprocket 104 is in transmission connection with a rear sprocket 109 on one of the rear wheels 110 through a second chain 108. When the front frame 101 is inclined through the swing mechanism 111, the first chain 106, the first transmission sprocket 103 and the driving sprocket 107 are all inclined, the multi-stage universal joint 105 changes in form to ensure that the second transmission sprocket 104 is not affected by the stress caused by the inclination of the front frame 101; the power is normally transmitted. However, in the above technical solution, the power needs to pass through the first chain 106, the first transmission sprocket 103, the multi-stage universal joint 105, the second transmission sprocket 104, the second chain 108 and the rear sprocket 109 to drive the rear wheel 110 to rotate, which belongs to multi-stage transmission, the transmission loss is large, the number of parts of the traditional system is greatly increased, the assembly process is complex, the distance between the two sprockets linked by the same chain is large, and two sets of chain transmission mechanisms are used, the reliability is poor, the ground clearance of the transmission system is small, the chain is easy to be scraped, bumped and fallen off during riding, the hidden danger of chain falling off cannot be solved, the reliability is poor, and the number of transmission parts is large, the assembly efficiency is low. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a swingable shaft transmission three-wheeled vehicle.

[0005] The main technical scheme of the swingable shaft transmission three-wheeled vehicle provided by the present application is as follows: a front frame, a rear frame and a transmission mechanism are provided, a front wheel is arranged on the front frame, two rear wheels are symmetrically arranged on the rear frame, the front frame is connected with the rear frame through a swing mechanism, characterized in that: the transmission mechanism comprises a first torque output assembly arranged on the front frame and a second torque output assembly arranged on the rear frame, the first torque output assembly transmits torque to the second torque output assembly through a transmission shaft, the second torque output assembly is in linkage cooperation with at least one of the two rear wheels, a transmission through hole is arranged in the middle of the swing mechanism, the transmission shaft passes through the transmission through hole, and the axis of the transmission shaft in the transmission through hole coincides with the axis of the swing mechanism.

[0006] The swingable shaft transmission three-wheeled vehicle provided by the present application also adopts the following auxiliary technical scheme:

[0007] The front frame is provided with a front beam, the front beam is provided with a front fork and a handle, and the front wheel is arranged on the front fork.

[0008] One end of the transmission shaft is matched with the first torque output assembly, and the other end of the transmission shaft passes through the transmission through hole and is matched with the second torque output assembly.

[0009] The swing mechanism comprises a first swing piece, a second swing piece, a connecting shaft and an elastic block, the elastic block is clamped between the first swing piece and the second swing piece, the first swing piece and the second swing piece are rotatably connected through the connecting shaft, the first swing piece is connected with the front frame, the second swing piece is connected with the rear frame, and the connecting shaft is provided with the transmission through hole in the middle part.

[0010] The first swing piece comprises a swing shaft and a first connecting part arranged at one end of the swing shaft, the second swing piece comprises a shaft sleeve and a connecting cover sleeved on the shaft sleeve, and the connecting cover is provided with a second connecting part; an outer clamping groove is arranged on the outer wall of the swing shaft, and an inner clamping groove is arranged on the inner wall of the shaft sleeve; the other end of the swing shaft is inserted into the shaft sleeve, the outer clamping groove is opposite to the inner clamping groove, one end of the elastic block is inserted into the inner clamping groove, and the other end of the elastic block is inserted into the outer clamping groove; the swing shaft is provided with a first insertion hole in the middle part, the connecting cover is provided with a second insertion hole, the connecting shaft passes through the second insertion hole and the first insertion hole, and the first swing piece and the second swing piece are rotatably connected; the connecting shaft is provided with the transmission through hole in the middle part.

[0011] The transmission shaft comprises at least two sectional transmission shafts, and adjacent two sectional transmission shafts are connected through a universal joint.

[0012] The transmission shaft comprises a first sectional transmission shaft, a second sectional transmission shaft and a third sectional transmission shaft, the first sectional transmission shaft and the second sectional transmission shaft are connected through a first universal joint, the second sectional transmission shaft and the third sectional transmission shaft are connected through a second universal joint, the first sectional transmission shaft is matched with the first torque output assembly, and the third sectional transmission shaft is matched with the second torque output assembly.

[0013] The front frame comprises an assembly mounting box, a hollow connecting beam arranged on the assembly mounting box, one end of the hollow connecting beam is connected with the assembly mounting box, the other end of the hollow connecting beam is connected with the swing mechanism, and the transmission shaft is arranged in the hollow connecting beam; the first torque output assembly is arranged in the assembly mounting box.

[0014] The rear frame comprises a wheel frame and a gear box arranged on the wheel frame, the gear box is connected with the swing mechanism, the second torque output assembly is arranged in the gear box, and the rear wheels are arranged on the wheel frame.

[0015] The wheel frame comprises a frame, two wheel mounting members symmetrically arranged on the frame, and wheel drive shafts arranged on the wheel mounting members, the rear wheels are arranged on the wheel drive shafts, and the second torque output assembly is connected with at least one wheel drive shaft.

[0016] A brake pad mechanism is arranged on the wheel mounting member, a brake drum or a brake disc is arranged on the rear wheel, and the brake pad mechanism cooperates with the brake drum or the brake disc. The disc brake and the drum brake are both relatively mature mechanisms in the prior art, and will not be described in detail here.

[0017] The first torque output assembly comprises a middle shaft rotatably arranged on the front frame, and cranks arranged at both ends of the middle shaft, the middle shaft is connected with the drive shaft through a first gear pair.

[0018] The first torque output assembly comprises a middle shaft and a rear shaft rotatably arranged on the front frame, a front sprocket arranged on the middle shaft, cranks arranged at both ends of the middle shaft, a rear sprocket and a first bevel gear arranged on the rear shaft, the front sprocket and the rear sprocket are connected and matched through a chain, a second bevel gear is arranged on the drive shaft, and the first bevel gear is engaged with the second bevel gear.

[0019] The middle shaft and the rear shaft are arranged in parallel, and the drive shaft is perpendicular to the rear shaft.

[0020] The first torque output assembly further comprises a tension sprocket which is pressed and matched with the chain.

[0021] The second torque output assembly comprises a torque output shaft arranged on the rear frame, the drive shaft is connected with the torque output shaft through a second gear pair, a clutch assembly is arranged between the drive shaft and the second gear pair or between the torque output shaft and the second gear pair, and the torque output shaft is connected and matched with at least one of the two rear wheels.

[0022] The second gear pair comprises a third bevel gear and a fourth bevel gear which are engaged, the fourth bevel gear is arranged on the torque output shaft, and the drive shaft is connected with the third bevel gear through a clutch assembly.

[0023] The clutch assembly comprises a torque input shaft arranged on the third bevel gear, a first end face ratchet arranged on the torque input shaft, an inner spline sleeve slidingly clamped on the transmission shaft, and an elastic member for pushing the inner spline sleeve to abut against the first end face ratchet.

[0024] The elastic member is a spring sleeved on the transmission shaft.

[0025] The torque input shaft is provided with a positioning insertion hole at an end opposite to the transmission shaft, and the end of the transmission shaft is inserted into the positioning insertion hole.

[0026] The third bevel gear, the torque input shaft and the first end face ratchet are integrally formed.

[0027] The clutch assembly further comprises a storage battery arranged on the front frame or the rear frame, an assist motor arranged on the front wheel, and a torque sensor arranged in the first torque output assembly, wherein the torque sensor is electrically connected with the assist motor, and the storage battery is connected with the torque sensor and the assist motor.

[0028] The torque sensor is provided with a torque triggering hole, and the middle shaft is arranged in the torque triggering hole, and the middle shaft rotates to trigger the torque sensor.

[0029] Compared with the prior art, the swingable shaft transmission tricycle provided by the application has the following advantages: the chain transmission of the conventional tricycle is changed to shaft transmission, and the transmission shaft is located in the plane of the middle line of the frame. Firstly, the problem of poor transmission reliability caused by the swing of the transmission system with the frame when the front frame and the rear frame swing is solved. Secondly, the problem of easy falling of the chain caused by bumping and vibration, which affects the riding experience and even safety, is solved. Thirdly, the shaft transmission solves the problem of large torque transmission loss caused by multi-stage chain transmission in the prior art. Finally, the center line of the section of the transmission shaft located in the transmission hole coincides with the rotation center line of the swing mechanism, so that when the swing mechanism swings, the transmission shaft will not be subjected to any force, ensuring the transmission performance of the application. In summary, the shaft transmission mechanism in the application has the advantages of simple structure, easy assembly, high reliability and maintenance-free transmission mechanism compared with the chain transmission mechanism in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1is a structural diagram of a three-wheeled vehicle with a swingable frame in the prior art.

[0031] Figure 2 is a bottom view of a three-wheeled vehicle with a swingable frame in the prior art.

[0032] Figure 3 is a structural diagram of a three-wheeled vehicle with a swingable shaft in the present application.

[0033] Figure 4 is a structural diagram of a three-wheeled vehicle with a swingable shaft in the present application.

[0034] Figure 5 is a structural diagram of a swingable mechanism in the present application.

[0035] Figure 6 is a structural diagram of a swingable mechanism in the present application.

[0036] Figure 7 is a structural diagram of a swingable mechanism in the present application.

[0037] Figure 8 is a structural diagram of a swingable mechanism in the present application.

[0038] Figure 9 is a structural diagram of a three-wheeled vehicle with a swingable shaft in the present application.

[0039] Figure 10 is Figure 9 an enlarged view of A.

[0040] Figure 11 is a side view of a three-wheeled vehicle with a swingable shaft in the present application.

[0041] Figure 12 is Figure 11 an enlarged view of B.

[0042] Figure 13 is a sectional view of a three-wheeled vehicle with a swingable shaft in the present application.

[0043] Figure 14 is a top view of a three-wheeled vehicle with a swingable shaft in the present application.

[0044] Figure 15 is Figure 14 an enlarged view of C.

[0045] Figure 16 is a structural diagram of a clutch assembly in the present application. Figure 1 .

[0046] Figure 17It is the structure of the clutch assembly in the application Figure 2 .

[0047] Figure 18 It is the structure diagram of the application after adding a battery to the swingable shaft transmission tricycle. DETAILED DESCRIPTION

[0048] Example one

[0049] Referring to Figures 3 to 15 , according to the application, the swingable shaft transmission tricycle embodiment comprises a front frame 1, a rear frame 2 and a transmission mechanism, the front frame 1 is provided with a front wheel 71 (the front wheel in the drawing is a structure diagram), the rear frame 2 is symmetrically provided with two rear wheels 72 (the rear wheel in the drawing is a structure diagram), the front frame 1 is swingably connected with the rear frame 2 through a swing mechanism 3, the transmission mechanism comprises a first torque output assembly 4 arranged on the front frame 1, a second torque output assembly 5 arranged on the rear frame 2, the first torque output assembly 4 transmits torque to the second torque output assembly 5 through a transmission shaft 6, the second torque output assembly 5 is in linkage cooperation with at least one of the two rear wheels 72, and the swing mechanism 3 is provided with a transmission through hole 331 in the middle, the transmission shaft 6 passes through the transmission through hole 331, and the center line of the transmission shaft 6 located in the transmission through hole 331 coincides with the center line of the swing mechanism 3.

[0050] Compared with the prior art, the application changes the chain transmission of the traditional tricycle into shaft transmission, and the transmission shaft 6 is located in the plane of the center line of the frame. First, the problem that the transmission system needs to swing with the frame when the front frame 1 and the rear frame 2 swing in the prior art is solved, and the poor transmission reliability is solved. Secondly, the problem that the chain is easily detached due to bumps and vibrations in the prior art, which affects the riding experience and even safety, is solved. Thirdly, the problem of large torque transmission loss caused by multi-stage transmission of the chain in the prior art is solved. Finally, the center line of the transmission shaft 6 located in the transmission through hole 331 coincides with the rotation center line of the swing mechanism 3, so that when the swing mechanism 3 swings, the transmission shaft 6 will not be subjected to any force, and the transmission performance of the application is ensured. In summary, the shaft transmission mechanism in the application has the advantages of simple structure, easy assembly, high reliability and maintenance-free transmission mechanism compared with the chain transmission mechanism in the prior art.

[0051] Referring to Figures 5 to 8, according to the above-mentioned embodiment of the application, the swing mechanism 3 comprises a first swing piece 31, a second swing piece 32, a connecting shaft 33 and an elastic block 34, the first swing piece 31 comprises a swing shaft 311 and a first connecting part 312 arranged at one end of the swing shaft 311, the second swing piece 32 comprises a shaft sleeve 321 and a connecting cover 322 sleeved on the shaft sleeve 321, and a second connecting part 3222 is arranged on the connecting cover 322; an outer clamping groove 313 is arranged on the outer wall of the swing shaft 311, and an inner clamping groove 3211 is arranged on the inner wall of the shaft sleeve 321; the other end of the swing shaft 311 is inserted into the shaft sleeve 321, the outer clamping groove 313 is opposite to the inner clamping groove 3211, one end of the elastic block 34 is inserted into the inner clamping groove 3211, and the other end of the elastic block 34 is inserted into the outer clamping groove 313; a first insertion hole 314 is arranged in the middle of the swing shaft 311, a second insertion hole 3221 is arranged on the connecting cover 322, the connecting shaft 33 passes through the second insertion hole 3221 and the first insertion hole 314, and the first swing piece 31 and the second swing piece 32 are rotatably connected; and the middle of the connecting shaft 33 is provided with the transmission through hole 331. The above-mentioned elastic block 34 can be a rubber elastic block. The above-mentioned outer clamping grooves 313 are a plurality of and evenly arranged on the outer wall of the swing shaft 311, and the above-mentioned inner clamping grooves 3211 are a plurality of and evenly arranged on the inner wall of the shaft sleeve 321. A locking nut 332 is further arranged on the connecting shaft 33, and the first swing piece 31 and the second swing piece 32 are rotatably connected through cooperation with the locking nut 322. A bearing 35 is arranged between the outer wall of the connecting shaft 33 and the inner wall of the first insertion hole 314. When the swing mechanism is in a static state, the elastic block 34 does not deform, when the first swing piece 31 is twisted relative to the second swing piece 32, the middle of the elastic block 34 is extruded and deformed, and with the automatic recovery of the elastic block 34, the first swing piece 31 also returns to the initial state. The first swing piece 31 and the second swing piece 32 are twisted along the connecting shaft 33, therefore, the axis of the connecting shaft 33 is the axis of the swing mechanism 3. The first connecting part 312 of the swing mechanism 3 is connected with the front frame 1 of the tricycle, the second connecting part 3222 is connected with the rear frame 2 of the tricycle, and in particular, the transmission through hole 331 is arranged to allow the transmission shaft 6 to pass through, so that the swing mechanism 3 and the transmission shaft 6, two rotating parts, are organically combined, which provides favorable conditions for the machining and production of the shaft transmission swing tricycle, and helps to simplify the transmission mechanism of the tricycle, and the above-mentioned swing mechanism has the advantages of simple and compact structure, few components, convenient assembly and low production cost.

[0052] See Figure 13According to the above-mentioned embodiments of the application, the transmission shaft 6 comprises at least two sectional transmission shafts 6, and two adjacent sectional transmission shafts 6 are connected through a universal joint. With the above-mentioned structure of the transmission shaft 6, the flexibility of the position setting of the first torque output assembly 4 and the second torque output assembly 5 is improved, that is, whether the output end of the first torque output assembly 4 and the input end of the second torque output assembly 5 are at the same height or the line connecting the two is a straight line, the transmission of torque will not be affected, the flexibility of the setting of the vehicle frame is improved, the matching degree of the transmission shaft 6 and the vehicle frame is widened, the precision requirement of the vehicle frame is reduced, and the yield of the product is improved.

[0053] Referring to Figure 12 and Figure 13 , according to the above-mentioned embodiments of the application, the transmission shaft 6 comprises a first sectional transmission shaft 61, a second sectional transmission shaft 62 and a third sectional transmission shaft 63, the first sectional transmission shaft 61 and the second sectional transmission shaft 62 are connected through a first universal joint 64, the second sectional transmission shaft 62 and the third sectional transmission shaft 63 are connected through a second universal joint 65, the first sectional transmission shaft 61 is matched with the first torque output assembly 4, and the third sectional transmission shaft 63 is matched with the second torque output assembly 5. In this embodiment, the above-mentioned three-section transmission shaft 6 is adopted, and under the premise of not affecting the design of the vehicle frame, the universal joint is used at least, the smoothness of the transmission process is ensured, and the reliability of the transmission is ensured.

[0054] Referring to Figure 3 , Figure 4 , Figure 9 , Figure 11 , Figure 13 and Figure 14According to the above embodiments of the invention, the front frame 1 includes a component mounting box 11 and a hollow connecting beam 12 disposed on the component mounting box 11. One end of the hollow connecting beam 12 is connected to the component mounting box 11, and the other end of the hollow connecting beam 12 is connected to the swing mechanism 3. The drive shaft 6 passes through the hollow connecting beam 12. The first torque output component 4 is disposed in the component mounting box 11. The structure of the front frame 1 such that the first torque output component 4 and the drive shaft 6 are both enclosed by the front frame 1, and the drive shaft 6 passes through the hollow connecting beam 12. Without changing the basic structure of the frame, the torque output component and the drive shaft 6 in this invention are enclosed in the frame, avoiding contamination from external rainwater and gravel, and ensuring the reliability and safety of the transmission system. The component mounting box 11 is provided with a front beam 13, and the front beam 13 is provided with a front fork and handlebars. The front wheel 71 is disposed on the front fork. One end of the drive shaft 6 is engaged with the first torque output component 4, and the other end of the drive shaft 6 passes through the transmission hole 331 and is engaged with the second torque output component. It also includes components such as a seat and pedals on the crank, which are existing technologies on tricycles and will not be described in detail here.

[0055] See Figure 3 , Figure 4 , Figure 9 , Figure 11 , Figure 13 and Figure 14 According to the above-described embodiments of the invention, the rear frame 2 includes a wheel frame 21 and a gearbox 22 mounted on the wheel frame 21. The gearbox 22 is connected to the rocker mechanism 3. The second torque output component 5 is disposed in the gearbox 22, and the rear wheel 72 is mounted on the wheel frame 21. The gearbox 22 ensures that the second torque output component 5 is in a closed environment. Combined with the fact that the first torque output component 4 and the drive shaft 6 are also enclosed in the frame, the transmission system of the present invention is completely enclosed in the frame. Under the condition that the frame is not damaged by external forces, it can achieve lifetime maintenance-free operation, greatly improving the reliability of the tricycle and extending the product's service life.

[0056] See Figure 3 and Figure 4According to the above-described embodiments of the invention, the wheel frame 21 includes a frame 211, two wheel mounting members 212 symmetrically arranged on the frame 211, and a wheel drive shaft 213 arranged on the wheel mounting members 212. The wheel drive shaft 213 is rotatably arranged on the wheel mounting members 212, and the rear wheel 72 is arranged on the wheel drive shaft 213. The second torque output component 5 is connected to at least one wheel drive shaft 213. This type of wheel frame 21 has a simple structure and is easy to assemble. It transmits torque to the rear wheel 72 through the wheel drive shaft 213. Compared with the prior art where the wheel axle does not rotate and the rear wheel 72 is driven to rotate by the chain 48 by a sprocket mounted on it, the rear wheel 72 can be disassembled and assembled without disassembling any parts of the transmission mechanism (such as the chain 48 in the prior art), which simplifies the assembly process of the rear wheel 72, especially the driven rear wheel 72, and improves assembly efficiency.

[0057] See Figure 3 and Figure 4 According to the above embodiments of the invention, the wheel mounting member 212 is provided with a brake pad mechanism 214, and the rear wheel 72 is provided with a brake drum or brake disc. The brake pad mechanism 214 cooperates with the brake drum or brake disc. Disc brakes and drum brakes are both relatively mature mechanisms in the prior art, and will not be described in detail here. In this embodiment, a brake drum is preferably provided on the rear wheel 72, and the above-mentioned brake pad mechanism 214 ensures the reliability of the brake of the present invention, thereby ensuring the safety of the rider.

[0058] See Figures 9 to 12 According to the above-described embodiments of the invention, the first torque output assembly 4 includes a central shaft 41 and a rear shaft 42 rotatably mounted on the front frame 1, a front sprocket 43 mounted on the central shaft 41, cranks 44 at both ends of the central shaft 41, a rear sprocket 45 mounted on the rear shaft 42, and a first bevel gear 46. The front sprocket 43 and the rear sprocket 45 are linked and engaged by a chain 48. A second bevel gear 47 is mounted on the drive shaft 6, and the first bevel gear 46 and the second bevel gear 47 mesh. This first torque output assembly 4 has a simple structure and flexible assembly, and is especially suitable for tricycles with rear wheels 72 of different diameters. When the size of the driven wheel changes, only a suitable rear sprocket 45 needs to be replaced to adjust the speed ratio, without needing to adjust the entire first torque output assembly 4. This structure reduces the types of parts for manufacturers producing various models, facilitates the standardization of assembly lines, improves production efficiency, and reduces the R&D costs of parts.

[0059] See Figures 9 to 12According to the above embodiments of the invention, the central shaft 41 and the rear shaft 42 are arranged in parallel, and the transmission shaft 6 is perpendicular to the rear shaft 42. This facilitates the assembly of components and ensures the reliability and stability of the transmission mechanism. The first torque output assembly 4 also includes a sprocket 49 that is pressed together with the chain 48. The sprocket 49 can press the loose chain 48, ensuring the adaptability of the chain 48 to various sprockets of different sizes. After the chain 48 in the first torque output assembly 4 is adapted to the front and rear sprockets, it is in a loose state. The sprocket 49 is used to elastically press it, which firstly prevents the chain 48 from falling off; secondly, when the diameter of the rear sprocket 45 or the front sprocket 43 changes, the original chain 48 can still be used without adjusting the length of the chain 48.

[0060] See Figure 4 , Figure 9 , Figures 13 to 17 According to the above-described embodiment of the invention, the second torque output assembly 5 includes a torque output shaft 51 disposed on the rear frame 2. The drive shaft 6 is connected to the torque output shaft 51 via a second gear pair. A clutch assembly is provided between the drive shaft 6 and the second gear pair or between the torque output shaft 51 and the second gear pair. In this embodiment, the clutch assembly is disposed between the drive shaft 6 and the second gear pair. The torque output shaft 51 is engaged with at least one of the two rear wheels 72. The torque output shaft 51 is engaged with at least one of the two rear wheels 72 via a universal joint 57. One end of the universal joint 57 is connected to the torque output shaft 51 via a third universal joint 58, and the other end of the universal joint 57 is connected to the wheel drive shaft 312 via a fourth universal joint 59. In this embodiment, the torque output shaft 51 is linked to one of the rear wheels 72. The aforementioned second torque output component 5 effectively transmits torque from the drive shaft 6 to the torque output shaft 51 perpendicular to it. At the same time, it has a simple structure, few parts, convenient assembly, and high reliability. The clutch component ensures that the rear wheel 72 can still rotate forward when the drive shaft 6 is stationary, which conforms to the riding habits of traditional transmission mechanisms.

[0061] See Figures 13 to 17According to the above-described embodiments of the invention, the second gear pair includes a meshing third bevel gear 53 and a fourth bevel gear 54, the fourth bevel gear 54 being disposed on the torque output shaft 51, and the transmission shaft 6 being connected to the third bevel gear 53 via a clutch assembly. The clutch assembly includes a torque input shaft 52 mounted on the third bevel gear 53, a first end face ratchet 521 mounted on the torque input shaft 52, an inner spline sleeve 55 slidably mounted on the transmission shaft 6, and an elastic element 56 that pushes the inner spline sleeve 55 against the first end face ratchet 521. One end of the torque input shaft 52 is connected to the third bevel gear 53, and the other end of the torque input shaft 52 is provided with the first end face ratchet 521. An outer spline 66 is provided on the outer wall of the transmission shaft 6. The inner spline sleeve 55 is slidably engaged with the outer spline 66. The end of the inner spline sleeve 55 opposite to the first end face ratchet 521 is provided with a second end face ratchet 551, and the first end face ratchet 521 engages with the second end face ratchet 551. When the drive shaft 6 rotates forward, driving the second torque transmission component to rotate the rear wheel 72 forward, the first end face ratchet 521 and the second end face ratchet 551 are engaged, and the second end face ratchet 551 can rotate accordingly. When the drive shaft 6 rotates in reverse, the first end face ratchet 521 cannot engage with the second end face ratchet 551, and therefore cannot rotate accordingly. Simultaneously, when the forward-rotating rear wheel 72 drives the second end face ratchet 551 to rotate, the second end face ratchet cannot engage with the first end face ratchet 521, and therefore cannot rotate accordingly. The clutch assembly described above is simple, compact, ingeniously designed, and has few parts. The elastic element 56 is a spring fitted onto the drive shaft 6. The elastic element 56 uses a spring, which is easy to assemble, low in cost, and highly reliable. The torque input shaft 52 has a positioning hole 522 at one end opposite to the drive shaft 6, and the end of the drive shaft 6 is inserted into the positioning hole 522. This structure ensures the reliability of the linkage between the drive shaft 6, the clutch, and the torque input shaft 52. The third bevel gear 53, the torque input shaft 52, and the first end face ratchet 521 are integrally formed. This facilitates the machining and assembly of components while ensuring the precision of the parts.

[0062] See Figure 1 and Figure 2 According to the above embodiments of the invention, the system further includes a battery 8 mounted on the front frame 1 or the rear frame 2, an assist motor (not shown) mounted on the front wheel 71, and a torque sensor 9 mounted in the first torque output assembly 4. The torque sensor 9 is electrically connected to the assist motor, and the battery 8 is connected to both the torque sensor 9 and the assist motor. In this embodiment, the battery 8 is mounted on the front frame 1. When this structure is used on an electric-assisted tricycle, the reliability of the electric-assisted tricycle is greatly improved, and the riding experience is significantly enhanced.

[0063] According to the above-described embodiments of the invention, the torque sensor 9 is provided with a torque trigger hole, and the central shaft 41 passes through the torque trigger hole. The rotation of the central shaft 41 triggers the torque sensor. This type of torque sensor can be directly triggered by a rotating shaft, which is highly compatible with electric-assisted three-way vehicles and helps to simplify the overall structure of the first torque output component 4.

[0064] Example 2

[0065] This embodiment is largely the same in structure as Embodiment 1 above, except that the structure of the first torque output component is different. The first torque output component 4 includes a central shaft 41 rotatably mounted on the front frame 1 and cranks 44 located at both ends of the central shaft 41. The central shaft 41 is connected to the drive shaft 6 through a first gear pair. This first torque output component 4 has a simple structure, few parts, and is easy to assemble.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A swingable shaft drive tricycle, comprising a front frame, a rear frame and a transmission mechanism, a front wheel is arranged on the front frame, two rear wheels are symmetrically arranged on the rear frame, and the front frame is connected with the rear frame through a swing mechanism, characterized in that: The transmission mechanism comprises a first torque output assembly arranged on the front frame and a second torque output assembly arranged on the rear frame, the first torque output assembly transmits torque to the second torque output assembly through a transmission shaft; the second torque output assembly is connected with at least one of the two rear wheels; The transmission shaft passes through the transmission through hole, and the axis of the transmission shaft in the transmission through hole coincides with the axis of the swing mechanism; The swing mechanism comprises a first swing piece, a second swing piece, a connecting shaft and an elastic block, the first swing piece comprises a swing shaft and a first connecting part arranged at one end of the swing shaft, the second swing piece comprises a shaft sleeve and a connecting cover sleeved on the shaft sleeve, an outer clamping groove is arranged on the outer wall of the swing shaft, and an inner clamping groove is arranged on the inner wall of the shaft sleeve; the elastic block is clamped between the first swing piece and the second swing piece, the first swing piece and the second swing piece are rotatably connected through the connecting shaft, the first swing piece and the second swing piece are twisted along the connecting shaft, the axis of the connecting shaft is the axis of the swing mechanism; the first swing piece is connected with the front frame, the second swing piece is connected with the rear frame, and the connecting shaft is arranged with the transmission through hole.

2. The tilting, shaft-driven tricycle of claim 1, wherein: A second connecting part is arranged on the connecting cover; the other end of the swing shaft is inserted into the shaft sleeve, the outer clamping groove is opposite to the inner clamping groove, one end of the elastic block is inserted into the inner clamping groove, and the other end of the elastic block is inserted into the outer clamping groove; a first insertion hole is arranged in the middle of the swing shaft, a second insertion hole is arranged on the connecting cover, and the connecting shaft passes through the second insertion hole and the first insertion hole; a bearing is arranged between the outer wall of the connecting shaft and the inner wall of the first insertion hole.

3. The tilting, shaft-driven tricycle of claim 1, wherein: The transmission shaft comprises at least two sectional transmission shafts, and adjacent two sectional transmission shafts are connected through a universal joint.

4. The tilting, shaft-driven tricycle of claim 1, wherein: The transmission shaft comprises a first sectional transmission shaft, a second sectional transmission shaft and a third sectional transmission shaft, the first sectional transmission shaft and the second sectional transmission shaft are connected through a first universal joint, the second sectional transmission shaft and the third sectional transmission shaft are connected through a second universal joint, the first sectional transmission shaft is matched with the first torque output assembly, and the third sectional transmission shaft is matched with the second torque output assembly.

5. The tilting, shaft-driven tricycle of claim 1, wherein: The front frame comprises an assembly mounting box and a hollow connecting beam arranged on the assembly mounting box, one end of the hollow connecting beam is connected with the assembly mounting box, the other end of the hollow connecting beam is connected with the swing mechanism, and the transmission shaft is arranged in the hollow connecting beam; the first torque output assembly is arranged in the assembly mounting box.

6. The tilting, shaft-driven tricycle of claim 1, wherein: The rear frame comprises a wheel frame and a gear box arranged on the wheel frame, the gear box is connected with the swing mechanism, the second torque output assembly is arranged in the gear box, and the rear wheels are arranged on the wheel frame.

7. The tilting axletree tricycle according to claim 6, characterized in that: The wheel frame comprises a frame, two wheel mounting pieces symmetrically arranged on the frame, and a wheel transmission shaft arranged on the wheel mounting piece, the rear wheels are arranged on the wheel transmission shaft, and the second torque output assembly is connected with at least one wheel transmission shaft.

8. The tilting, shaft-driven tricycle of claim 1, wherein: The first torque output assembly comprises a middle shaft rotatably arranged on the front frame, and cranks arranged at both ends of the middle shaft, the middle shaft being connected with the transmission shaft through a first gear pair.

9. The tilting, shaft-driven tricycle of claim 1, wherein: The first torque output assembly comprises a middle shaft and a rear shaft rotatably arranged on the front frame, a front sprocket arranged on the middle shaft, cranks arranged at both ends of the middle shaft, a rear sprocket arranged on the rear shaft, and a first bevel gear, the front sprocket and the rear sprocket being connected through a chain, and the transmission shaft being provided with a second bevel gear, the first bevel gear being engaged with the second bevel gear.

10. The tilting, shaft-driven tricycle of claim 1, wherein: The second torque output assembly comprises a torque output shaft arranged on the rear frame, the transmission shaft being connected with the torque output shaft through a second gear pair, and a clutch assembly being arranged between the transmission shaft and the second gear pair or between the torque output shaft and the second gear pair, the torque output shaft being connected with at least one of the two rear wheels.

11. The tilting, shaft-driven tricycle of claim 10, wherein: The second gear pair comprises a third bevel gear and a fourth bevel gear engaged with each other, the fourth bevel gear being arranged on the torque output shaft, and the transmission shaft being connected with the third bevel gear through the clutch assembly.

12. The tilting, shaft-driven tricycle of claim 11, wherein: The clutch assembly comprises a torque input shaft arranged on the third bevel gear, a first end face ratchet arranged on the torque input shaft, an inner spline sleeve slidingly arranged on the transmission shaft, and an elastic member pushing the inner spline sleeve to abut against the first end face ratchet, one end of the torque input shaft being connected with the third bevel gear, the other end of the torque input shaft being provided with the first end face ratchet, an outer spline being arranged on the outer wall of the transmission shaft, the inner spline sleeve being slidingly connected with the outer spline, a second end face ratchet being arranged on the end of the inner spline sleeve opposite to the first end face ratchet, the first end face ratchet being connected with the second end face ratchet, the elastic member being a spring sleeved on the transmission shaft, one end of the torque input shaft opposite to the transmission shaft being provided with a positioning insertion hole, and the end of the transmission shaft being inserted into the positioning insertion hole, the third bevel gear, the torque input shaft, and the first end face ratchet being an integral structure.

13. The tilting, shaft-driven tricycle of any of claims 1-12, wherein: The application further comprises a storage battery arranged on the front frame or the rear frame, a power-assisted motor arranged on the front wheel, and a torque sensor arranged in the first torque output assembly, the torque sensor being electrically connected with the power-assisted motor, and the storage battery being connected with the torque sensor and the power-assisted motor.

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