Swinging shaft-drive tricycle

Abstract

The tricycle has a front chassis (1), a rear chassis (2) and a transmission mechanism, the front chassis (1) is connected to the rear chassis (2) by a swing mechanism (3), the transmission mechanism includes a first torque output assembly (4) provided on the front chassis (1) and a second torque output assembly (5) provided on the rear chassis, the first torque output assembly (4) transmits torque to the second torque output assembly (5) by a transmission shaft (6), and the second torque output assembly (5) is interlockingly engaged with at least one of two rear wheels (72). The tricycle solves the problem of low transmission reliability in the prior art, which occurs when swinging occurs between the front and rear chassis, because the transmission system needs to swing along with the chassis, and also solves the problem of the prior art, which is that the chain is easily dislodged due to swinging or vibration, which affects the riding experience and ultimately affects safety.

Description

[Technical Field]

[0001] FIELD OF THE INVENTION The present invention relates to the field of tricycles, and more particularly to oscillating shaft-drive tricycles. [Background technology]

[0002] Pedal tricycles are a common form of light transportation used in daily life, offering the same convenience as bicycles but with the ability to carry more items. With technological advances, electric tricycles have emerged to conserve the rider's physical strength. These tricycles primarily use a torque sensor on the crankshaft to detect the crankshaft's rotation signal, and a controller then controls the motor to power the tricycle's drive wheels, thereby conserving the rider's physical strength. Such power-assisted tricycles differ substantially from electric motorcycle tricycles, for example, in the means for controlling the motor's rotation. Instead of a throttle valve on the handlebars, the rider uses the pedals to drive the crankshaft, which then activates a torque sensor, which in turn controls the motor to drive the tricycle's drive wheels, ensuring greater safety.

[0003] The main reason tricycles are prone to tipping over when turning is that their center of gravity shifts between the front wheel and the outer rear wheel, making them prone to tipping and tipping over under the action of centrifugal force. Currently, some countries have mandatory regulations requiring the rear clearance width of a tricycle to be no wider than the width of the front handlebars. Because the handlebar width cannot be too large, the wheelbase between the two rear wheels of a tricycle is relatively narrow, and the two rear wheels are coaxially driven, making them prone to tipping and tipping over when turning. For example, tricycles for the Japanese market have two requirements. First, the total width of the tricycle must be within 600 mm. Second, the tricycle chassis must consist of a front and rear chassis, with the front chassis capable of axially swinging left and right while cycling, while the rear chassis remains level. When turning, the front chassis swings a certain angle relative to the rear chassis, shifting the center of gravity of the tricycle to the inside of the curve, making the tricycle more stable and reliable when turning. When the front chassis swings during cycling, the conventional chain directly drives the rear wheel, causing the chain to twist in an eight-shape, with different torques twisting between the left and right sides. This affects cycling safety and makes it difficult to control the handlebars. Therefore, such tricycles are designed with a multi-stage transmission system.As shown in Figures 1 and 2, the tricycle has a front chassis 101 and a rear chassis 102. The rear chassis 102 is provided with a support frame 1021 extending downward. A swing mechanism 111 is provided on the support frame 1021. The front chassis 101 is connected to the swing mechanism 111. A first transmission sprocket 103 is provided on one side of the rear of the front chassis 101. A second transmission sprocket 104 is provided on the other side of the front of the rear chassis 102. The first transmission sprocket 103 and the second transmission sprocket 104 are installed opposite each other and connected by a multi-stage universal joint 105. The first transmission sprocket 103 is operatively connected to a drive sprocket 107 on a crankshaft of the front chassis 101 by a first chain 106. The second transmission sprocket 104 is operatively connected to a rear sprocket 109 on one of the rear wheels 110 by a second chain 108. When the front chassis 101 is tilted by the swing mechanism 111, the first chain 106, the first transmission sprocket 103 and the driving sprocket 107 all tilt accordingly, causing a change in shape in the multi-stage universal joint 105. This ensures that the second transmission sprocket 104 is not subjected to stress due to the tilt of the front chassis 101, and normal power transmission is maintained. However, in the above technical solution, the power must 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 before it can drive the rear wheel 110 to rotate. This multi-stage transmission results in relatively large transmission losses. In addition, the number of parts in the conventional system is significantly increased, the assembly process is complicated, the wheel base of the two sprockets connected by the same chain is relatively large, and there are two sets of chain transmission mechanisms, which results in low reliability. The transmission system has a small ground clearance, making it prone to rubbing against or hitting objects on the ground during cycling. This does not solve the potential risk of the chain falling off, resulting in low reliability, a large number of transmission parts, and low assembly efficiency. Summary of the Invention [Problem to be solved by the invention]

[0004] The technical problem that the present invention aims to solve is to provide a swingable shaft-drive tricycle that overcomes the above-mentioned deficiencies of the prior art. [Means for solving the problem]

[0005] The main technical solution used by the oscillating shaft-drive tricycle of the invention is a oscillating shaft-drive tricycle comprising a front chassis, a rear chassis and a transmission mechanism, wherein a front wheel is mounted on the front chassis and two rear wheels are symmetrically mounted on the rear chassis, and the front chassis is connected to the rear chassis by a swing mechanism; the transmission mechanism includes a first torque output assembly mounted on the front chassis and a second torque output assembly mounted on the rear chassis, the first torque output assembly transmits torque to the second torque output assembly through a transmission shaft, and the second torque output assembly is interlockingly engaged with at least one of the two rear wheels; a transmission through-hole is provided in the center of the swing mechanism, the transmission shaft passes through the transmission through-hole, and the axis of the transmission shaft located within the transmission through-hole overlaps with the axis of the swing mechanism.

[0006] The swingable shaft-driven tricycle of the present invention further employs the following accompanying technical solutions:

[0007] A front beam is provided on the assembly mounting box, a front fork and a handle are provided on the front beam, and the front wheel is provided on the front fork.

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

[0009] The rocking mechanism includes a first rocking member, a second rocking member, a connecting shaft, and an elastic block, the elastic block is engaged between the first rocking member and the second rocking member, the first rocking member and the second rocking member are rotatably connected by the connecting shaft, the first rocking member is connected to the front chassis, the second rocking member is connected to the rear chassis, and the transmission through hole is provided in the center of the connecting shaft.

[0010] the first oscillating member includes an oscillating shaft and a first connecting part provided on one end of the oscillating shaft; the second oscillating member includes an oscillating sleeve and a connecting cover fitted onto the oscillating sleeve; the connecting cover is provided with a second connecting part; an outer wall of the oscillating shaft is provided with an outer locking groove; an inner wall of the oscillating sleeve is provided with an inner locking groove; the other end of the oscillating shaft is inserted into the oscillating sleeve, the outer locking groove faces the inner locking groove; one end of the elastic block is inserted into the inner locking groove; the other end of the elastic block is inserted into the outer locking groove; a first insertion hole is provided in the center of the oscillating shaft; the connecting cover is provided with a second insertion hole; the connecting shaft passes through the second insertion hole and the first insertion hole to rotatably connect the first oscillating member and the second oscillating member; and the transmission through hole is provided in the center of the connecting shaft.

[0011] The transmission shaft includes at least two stepped transmission shafts, and two adjacent stepped transmission shafts are connected to each other by a universal joint.

[0012] The transmission shafts include a first stepped transmission shaft, a second stepped transmission shaft, and a third stepped transmission shaft, the first stepped transmission shaft and the second stepped transmission shaft are connected by a first universal joint, the second stepped transmission shaft and the third stepped transmission shaft are connected by a second universal joint, the first stepped transmission shaft engages with the first torque output assembly, and the third stepped transmission shaft engages with the second torque output assembly.

[0013] The front chassis includes an assembly mounting box and a hollow connecting beam provided in the assembly mounting box, one end of the hollow connecting beam is connected to the assembly mounting box and the other end of the hollow connecting beam is connected to a swing mechanism, the transmission shaft is drilled through the hollow connecting beam, and the first torque output assembly is provided in the assembly mounting box.

[0014] The rear chassis includes a wheel frame and a gearbox provided in the wheel frame, the gearbox is connected to the swing mechanism, the second torque output assembly is provided in the gearbox, and the rear wheels are provided in the wheel frame.

[0015] The wheel frame includes a frame, two wheel mounting members symmetrically mounted on the frame, and a wheel transmission shaft mounted on the wheel mounting members, the rear wheels are mounted on the wheel transmission shafts, and the second torque output assembly is connected to at least one of the wheel transmission shafts.

[0016] The wheel mounting member is provided with a brake lining mechanism, and the rear wheel is provided with a brake drum or brake disc, and the brake lining mechanism engages with the brake drum or brake disc. Since both disc brakes and drum brakes are more mature mechanisms in the prior art, detailed descriptions are omitted here.

[0017] The first torque output assembly includes a center shaft rotatably mounted on the front chassis and cranks mounted on both ends of the center shaft, and the center shaft is linked to the transmission shaft by a first gear pair.

[0018] The first torque output assembly includes a center axle and a rear axle rotatably mounted on the front chassis, a front sprocket mounted on the center axle, cranks mounted on both ends of the center axle, and a rear sprocket and a first bevel gear mounted on the rear axle, the front sprocket and rear sprocket being interlocked with each other by a chain, a second bevel gear being mounted on the transmission shaft, and the first bevel gear meshing with the second bevel gear.

[0019] The center shaft is disposed parallel to the rear shaft, and the transmission shaft is perpendicular to the rear shaft.

[0020] The first torque output assembly further includes a tensioning sprocket in compressive engagement with the chain.

[0021] The second torque output assembly includes a torque output shaft provided on the rear chassis, the transmission shaft is coupled to the torque output shaft by a second gear pair, a clutch assembly is provided between the transmission shaft and the second gear pair or between the torque output shaft and the second gear pair, and the torque output shaft is coupled to at least one of the two rear wheels.

[0022] The second gear pair includes third and fourth bevel gears that are meshed together, the fourth bevel gear being mounted on the torque output shaft, and the transmission shaft being coupled to the third bevel gear by a clutch assembly.

[0023] The clutch assembly includes a torque input shaft provided on the third bevel gear, a first face ratchet provided on the torque input shaft, an internally splined sleeve slidably engaged with the transmission shaft, and an elastic member that pushes the internally splined sleeve so as to abut against the first face ratchet, one end of the torque input shaft is connected to the third bevel gear, the first face ratchet is provided on the other end of the torque input shaft, an external spline is provided on an outer wall of the transmission shaft, the internal splined sleeve is slidably engaged with the external spline, a second face ratchet is provided on the end of the internal spline sleeve opposite the first face ratchet, and the first face ratchet engages with the second face ratchet.

[0024] The elastic member is a spring fitted onto the transmission shaft.

[0025] A positioning insertion hole is provided at the end of the torque input shaft facing 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 face ratchet are integrally formed.

[0027] The vehicle further includes a storage battery provided on the front chassis or the rear chassis, a power assist motor provided on the front wheel, and a torque sensor provided within the first torque output assembly, wherein the torque sensor is electrically connected to the power assist motor, and the storage battery is connected to the torque sensor and the power assist motor.

[0028] The torque sensor is provided with a torque actuation hole, the center shaft is drilled in the torque actuation hole, and the center shaft rotates to actuate the torque sensor. [Effects of the Invention]

[0029] Compared to the prior art, the oscillating shaft-drive tricycle of the present invention has the following advantages. Compared to the prior art, the present invention replaces the chain transmission of a conventional tricycle with a shaft drive, and the transmission shaft is located on the same plane as the chassis midline. First, it solves the problem of the prior art, where the transmission system must swing along with the chassis when swinging occurs between the front and rear chassis, resulting in low transmission reliability. Second, it solves the problem of the prior art, where the chain is easily dislodged due to swinging or vibration, affecting the riding experience and ultimately safety. Third, the shaft drive solves the problem of the prior art, where the torque transmission loss is high due to the multi-stage chain transmission. Finally, the center line of a portion of the transmission shaft located within the transmission through-hole overlaps with the rotation center line of the swing mechanism, so the transmission shaft is not subjected to any force when the swing mechanism swings, thereby ensuring the transmission performance of the present invention. In short, compared to the prior art chain transmission mechanism, the present shaft drive mechanism has the advantages of a simple structure, easy assembly, high reliability, and low maintenance. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 1 is a structural diagram of a tricycle with a swingable chassis according to the prior art. [Figure 2] FIG. 1 is a bottom view of a prior art tricycle with a swingable chassis. [Figure 3] 1 is a structural diagram of a swingable shaft-drive tricycle according to the present invention; [Figure 4] 1 is a structural diagram showing a front chassis, a swing mechanism, and a rear chassis according to the present invention assembled together; [Figure 5] FIG. 2 is a structural diagram of a swing mechanism according to the present invention. [Figure 6] FIG. 2 is a structural diagram of the swing mechanism according to the present invention with the connection cover removed. [Figure 7] 4 is a structural diagram of a connection cover of a swing mechanism according to the present invention. FIG. [Figure 8] FIG. 2 is a structural diagram of a first swinging member of the swinging mechanism according to the present invention. [Figure 9] 1 is a structural diagram showing a part of the front chassis, a swing mechanism, and a part of the rear chassis assembled together according to the present invention; [Figure 10] FIG. 10 is an enlarged view of A in FIG. [Figure 11] FIG. 10 is a side view showing a part of the front chassis, a swing mechanism, and a part of the rear chassis assembled together according to the present invention. [Figure 12] FIG. 12 is an enlarged view of B in FIG. [Figure 13] 1 is a partial cross-sectional view showing a part of the front chassis, a swing mechanism, and a part of the rear chassis assembled together according to the present invention; [Figure 14] FIG. 1 is a plan view showing a part of a front chassis, a swing mechanism, and a part of a rear chassis assembled together according to the present invention. [Figure 15] FIG. 15 is an enlarged view of C in FIG. [Figure 16] FIG. 2 is a first structural exploded view of the clutch assembly according to the present invention. [Figure 17] FIG. 2 is a second structural exploded view of the clutch assembly according to the present invention. [Figure 18]FIG. 2 is a structural diagram of the swingable shaft-driven tricycle of the present invention after a storage battery has been added and installed. DETAILED DESCRIPTION OF THE INVENTION

[0031] Example 1 3 to 15, an embodiment of a swingable shaft-drive tricycle according to the present invention comprises a front chassis 1, a rear chassis 2, and a transmission mechanism, wherein a front wheel 71 (the front wheel in the figure is a structural schematic diagram) is provided on the front chassis 1, and two rear wheels 72 (the rear wheels in the figure are a structural schematic diagram) are symmetrically provided on the rear chassis 2, the front chassis 1 is swingably connected to the rear chassis 2 by a swing mechanism 3, and the transmission mechanism is connected to a first torque output assembly provided on the front chassis 1. The swing mechanism 3 includes a first torque output assembly 4 and a second torque output assembly 5 provided on the rear chassis 2, the first torque output assembly 4 transmits torque to the second torque output assembly 5 via a transmission shaft 6, the second torque output assembly 5 is interlockingly engaged with at least one of the two rear wheels 72, a transmission through hole 331 is provided in the center of the swing mechanism 3, the transmission shaft 6 passes through the transmission through hole 331, and the axis of the transmission shaft 6 located within the transmission through hole 331 overlaps with the axis of the swing mechanism 3.

[0032] Compared with the prior art, the present invention replaces the chain transmission of a conventional tricycle with a shaft drive, and the transmission shaft 6 is located on the same plane as the chassis midline. This solves two problems: first, the prior art's problem of low transmission reliability due to the transmission system's need to swing along with the chassis when swinging occurs between the front and rear chassis 1 and 2; second, the prior art's problem of the chain easily falling off due to swinging or vibration, which affects the riding experience and ultimately safety; and third, the shaft drive solves the prior art's problem of high torque transmission loss due to the multi-stage chain transmission. Finally, the center line of a portion of the transmission shaft 6 located within the transmission through-hole 331 overlaps with the rotation center line of the swing mechanism 3, so that the transmission shaft 6 is not subjected to any force when the swing mechanism 3 swings, thereby ensuring the transmission performance of the present invention. In short, compared with the prior art's chain transmission mechanism, the present shaft drive mechanism has the advantages of a simple structure, easy assembly, high reliability, and low maintenance.

[0033] 5 to 8, according to the above embodiment of the invention, the swing mechanism 3 includes a first swing member 31, a second swing member 32, a connecting shaft 33, and an elastic block 34, the first swing member 31 includes a swing shaft 311 and a first connecting portion 312 provided at one end of the swing shaft 311, the second swing member 32 includes a shaft sleeve 321 and a connecting cover 322 fitted onto the shaft sleeve 321, the connecting cover 322 is provided with a second connecting portion 3222, an outer locking groove 313 is provided on the outer wall of the swing shaft 311, an inner locking groove 3211 is provided on the inner wall of the shaft sleeve 321, and the swing shaft 31 The other end of the elastic block 34 is inserted into the shaft sleeve 321, the outer locking groove 313 faces the inner locking groove 3211, one end of the elastic block 34 is inserted into the inner locking groove 3211 and the other end of the elastic block 34 is inserted into the outer locking groove 313, a first insertion hole 314 is provided in the center of the swing shaft 311, a second insertion hole 3221 is provided in the connection cover 322, the connecting shaft 33 passes through the second insertion hole 3221 and the first insertion hole 314 to rotatably connect the first swing member 31 and the second swing member 32, and the transmission through hole 331 is provided in the center of the connecting shaft 33. The elastic block 34 may be a rubber elastic block. The outer locking grooves 313 are plural and uniformly arranged on the outer wall of the swing shaft 311, and the inner locking grooves 3211 are plural and uniformly arranged on the inner wall of the shaft sleeve 321. The connecting shaft 33 is further provided with a lock nut 332, which engages with the lock nut 322 to rotatably connect the first swing member 31 and the second swing member 32. A bearing 35 is provided between the outer wall of the connecting shaft 33 and the inner wall of the first insertion hole 314. When the swing mechanism is stationary, the elastic block 34 does not deform. When the first swing member 31 is swung relative to the second swing member 32, the center of the elastic block 34 is extruded and deformed. As the elastic block 34 automatically recovers, the first swing member 31 also recovers to its initial state. Because the first swing member 31 and the second swing member 32 are swung along the connecting shaft 33, the axial center of the connecting shaft 33 is the axial center of the swing mechanism 3.The first connection part 312 of the oscillating mechanism 3 is connected to the tricycle front chassis 1, and the second connection part 3222 is connected to the tricycle rear chassis 2. In particular, the installation of a transmission through-hole 331 allows the transmission shaft 6 to pass through, realizing an organic connection between the two rotating parts, the oscillating mechanism 3 and the transmission shaft 6. This provides favorable conditions for the processing and production of shaft-driven oscillating tricycles and contributes to simplifying the transmission mechanism of such tricycles. The oscillating mechanism has a simple and compact structure, requires few parts, is easy to assemble, and has low production costs.

[0034] 13 , according to the above embodiment of the invention, the transmission shaft 6 includes at least two stepped transmission shafts 6, and two adjacent stepped transmission shafts 6 are connected by a universal joint. The transmission shaft 6 using the above structure improves the flexibility of positioning the first torque output assembly 4 and the second torque output assembly 5, i.e., regardless of 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 whether the connecting line between them is straight, neither of these will affect the transmission of torque, improve the flexibility of chassis setting, improve the compatibility of the transmission shaft 6 with the chassis, reduce the precision requirements for the chassis, and improve product yield.

[0035] 12 and 13, according to the above embodiment of the invention, the transmission shaft 6 includes a first stepped transmission shaft 61, a second stepped transmission shaft 62, and a third stepped transmission shaft 63, the first stepped transmission shaft 61 and the second stepped transmission shaft 62 are connected by a first universal joint 64, the second stepped transmission shaft 62 and the third stepped transmission shaft 63 are connected by a second universal joint 65, the first stepped transmission shaft 61 is engaged with the first torque output assembly 4, and the third stepped transmission shaft 63 is engaged with the second torque output assembly 5. This embodiment uses the above three-stage transmission shaft 6, and requires the use of at least universal joints provided that it does not affect the chassis design, thereby ensuring smooth transmission and transmission reliability.

[0036] 3, 4, 9, 11, 13 and 14, according to the above embodiment of the invention, the front chassis 1 includes an assembly mounting box 11 and a hollow connecting beam 12 provided in the assembly mounting box 11, one end of the hollow connecting beam 12 is connected to the assembly mounting box 11 and the other end of the hollow connecting beam 12 is connected to the swing mechanism 3, the transmission shaft 6 is drilled through the hollow connecting beam 12, and the first torque output assembly 4 is provided in the assembly mounting box 11. Due to the structure of the front chassis 1, both the first torque output assembly 4 and the transmission shaft 6 are covered by the front chassis 1, and the transmission shaft 6 is drilled through the hollow connecting beam 12. Therefore, even if the basic structure of the chassis is not changed, the torque output assembly and the transmission shaft 6 of the present invention are both sealed within the chassis, preventing contamination by external rainwater and sand and ensuring the reliability and safety of the transmission system. A front beam 13 is mounted on the assembly mounting box 11, a front fork and a handlebar are mounted on the front beam 13, and the front wheel 71 is mounted on the front fork. One end of the transmission shaft 6 engages with the first torque output assembly 4, and the other end of the transmission shaft 6 passes through the transmission through hole 331 and engages with the second torque output assembly. The bicycle is further equipped with a saddle, pedals mounted on the crank, and other components, all of which are conventional technologies for tricycles and will not be described in detail here.

[0037] 3, 4, 9, 11, 13 and 14, according to the above embodiment of the invention, the rear chassis 2 includes a wheel frame 21 and a gearbox 22 mounted on the wheel frame 21, the gearbox 22 is connected to the swing mechanism 3, the second torque output assembly 5 is mounted in the gearbox 22, and the rear wheel 72 is mounted on the wheel frame 21. The installation of the gearbox 22 ensures that the second torque output assembly 5 is in a sealed environment. Combined with the fact that the first torque output assembly 4 and the transmission shaft 6 are both sealed within the chassis, the transmission system of the present invention is completely sealed within the chassis, and unless the chassis is damaged by external forces, it does not require permanent maintenance. This greatly improves the reliability of the tricycle and extends the service life of the product.

[0038] 3 and 4, according to the above embodiment of the invention, the wheel frame 21 includes a frame 211, two wheel mounting members 212 symmetrically mounted on the frame 211, and a wheel transmission shaft 213 mounted on the wheel mounting members 212, the wheel transmission shaft 213 being rotatably mounted on the wheel mounting members 212, the rear wheels 72 being mounted on the wheel transmission shafts 213, and the second torque output assembly 5 being connected to at least one of the wheel transmission shafts 213. Such a wheel frame 21 has a simple structure and is easy to assemble. Torque is transmitted to the rear wheels 72 via the wheel transmission shafts 213, and installation and removal of the rear wheels 72 does not require installation and removal of any parts in the transmission mechanism (for example, the need to install and remove the chain 48 in the prior art), compared to the prior art in which the wheel shafts do not rotate but are instead driven by a chain 48 attached to the rear wheels 72 to rotate on their own axes by sprockets attached to the rear wheels 72. This simplifies the assembly process of the rear wheels 72, particularly the driven rear wheels 72, and improves assembly efficiency.

[0039] 3 and 4, according to the above embodiment of the invention, the wheel mounting member 212 is provided with a brake lining mechanism 214, the rear wheel 72 is provided with a brake drum or brake disc, and the brake lining mechanism 214 engages with the brake drum or brake disc. Since both disc brakes and drum brakes are more mature mechanisms in the prior art, detailed descriptions are omitted here. In this embodiment, it is preferable to install a brake drum on the rear wheel 72, and the use of the brake lining mechanism 214 ensures the reliability of the brake of the present invention, thereby ensuring the safety of the rider.

[0040] 9 to 12, according to the above embodiment of the invention, the first torque output assembly 4 includes a center axle 41 and a rear axle 42 rotatably mounted on the front chassis 1, a front sprocket 43 mounted on the center axle 41, cranks 44 mounted on both ends of the center axle 41, and a rear sprocket 45 and a first bevel gear 46 mounted on the rear axle 42, the front sprocket 43 and the rear sprocket 45 being interlocked with each other by a chain 48, a second bevel gear 47 is mounted on the transmission shaft 6, and the first bevel gear 46 meshes with the second bevel gear 47. This type of first torque output assembly 4 has a simple structure and can be assembled flexibly, making it particularly suitable for tricycles having rear wheels 72 with different diameters. When the size of the driven wheel changes, the transmission ratio can be adjusted simply by replacing the appropriate rear sprocket 45, without having to adjust the entire first torque output assembly 4. This structure reduces the number of parts required for tricycle manufacturers that produce a variety of different model numbers, contributes to standardizing assembly lines, improves production efficiency, and reduces parts research and development costs.

[0041] 9 to 12, according to the above-described embodiment of the invention, the center shaft 41 is installed parallel to the rear axle 42, and the transmission shaft 6 is perpendicular to the rear axle 42. This facilitates assembly of parts and ensures the reliability and stability of the transmission mechanism. The first torque output assembly 4 further includes a tension sprocket 49 that crimps and engages with the chain 48. The tension sprocket 49 can crimp a loose chain 48, ensuring compatibility between the chain 48 and sprockets of various sizes. The chain 48 in the first torque output assembly 4 is in a loose state after being fitted to the front and rear sprockets. By elastically crimping the tension sprocket 49, the chain 48 can be prevented from falling off. Furthermore, when the diameter of the rear sprocket 45 or the front sprocket 43 changes, the original chain 48 can still be used without having to adjust the length of the chain 48.

[0042] 4, 9, and 13 to 17, according to the above-described embodiment of the invention, the second torque output assembly 5 includes a torque output shaft 51 provided on the rear chassis 2, the transmission shaft 6 is interlocked with the torque output shaft 51 by a second gear pair, a clutch assembly is provided between the transmission shaft 6 and the second gear pair or between the torque output shaft 51 and the second gear pair, the clutch assembly of this embodiment is provided between the transmission shaft 6 and the second gear pair, and the torque output shaft 51 is interlockingly engaged with at least one of the two rear wheels 72. The torque output shaft 51 is interlockingly engaged with at least one of the two rear wheels 72 by a universal transmission shaft 57, one end of the universal transmission shaft 57 is connected to the torque output shaft 51 by a third universal joint 58, and the other end of the universal transmission shaft 57 is connected to the wheel transmission shaft 312 by a fourth universal joint 59. In this embodiment, the torque output shaft 51 is interlocked with one of the rear wheels 72, and the second torque output assembly 5 effectively transmits torque from the transmission shaft 6 to the torque output shaft 51 perpendicular thereto, while at the same time having a simple structure, few parts, easy assembly, and high reliability. The installation of a clutch assembly ensures that the rear wheel 72 can still rotate forward when the transmission shaft 6 is stationary, which is in line with cycling habits for conventional transmission mechanisms.

[0043] 13 to 17, according to the above embodiment of the invention, the second gear pair includes a third bevel gear 53 and a fourth bevel gear 54 that are meshed together, the fourth bevel gear 54 is provided on the torque output shaft 51, and the transmission shaft 6 is coupled to the third bevel gear 53 by a clutch assembly. The clutch assembly includes a torque input shaft 52 provided on the third bevel gear 53, a first face ratchet 521 provided on the torque input shaft 52, an internally splined sleeve 55 slidably engaged with the transmission shaft 6, and an elastic member 56 that presses the internally splined sleeve 55 so as to abut against the first face ratchet 521, one end of the torque input shaft 52 is connected to the third bevel gear 53, the first face ratchet 521 is provided on the other end of the torque input shaft 52, an external spline 66 is provided on the outer wall of the transmission shaft 6, the internal splined sleeve 55 is slidably engaged with the external spline 66, a second face ratchet 551 is provided on the end of the internal spline sleeve 55 opposite the first face ratchet 521, and the first face ratchet 521 engages with the second face ratchet 551.

[0033] When the transmission shaft 6 rotates forward, that is, when the transmission shaft 6 drives the second torque transmission assembly to move the rear wheel 72 to rotate forward, the first face ratchet 521 and the second face ratchet 551 are engaged, and the second face ratchet 551 can be moved to rotate accordingly; when the transmission shaft 6 rotates reversely, the first face ratchet 521 cannot engage with the second face ratchet 551, and therefore the second face ratchet 551 cannot be moved to rotate accordingly; at the same time, when the rear wheel 72 rotating forward moves the second face ratchet 551 to rotate, the second face ratchet cannot engage with the first face ratchet 521, and therefore the first face ratchet 521 cannot be moved to rotate either. The above clutch assembly has a simple and compact structure, an ingenious design, and few parts. The elastic member 56 is a spring fitted onto the transmission shaft 6. The elastic member 56 is a spring, which is easy to assemble, low cost, and highly reliable.A positioning insertion hole 522 is provided at the end of the torque input shaft 52 facing the transmission shaft 6, and the end of the transmission shaft 6 is inserted into the positioning insertion hole 522. This structure ensures reliable interlocking between the transmission shaft 6, clutch, and torque input shaft 52. The third bevel gear 53, torque input shaft 52, and first face ratchet 521 have an integrally molded structure. This facilitates processing and assembly of the components and ensures precision of the parts.

[0044] 1 and 2, according to the above embodiment of the invention, the vehicle further includes a storage battery 8 mounted on the front chassis 1 or the rear chassis 2, a power assist motor (not shown) mounted on the front wheel 71, and a torque sensor 9 mounted within the first torque output assembly 4, the torque sensor 9 being electrically connected to the power assist motor, and the storage battery 8 being connected to the torque sensor 9 and the power assist motor. If the storage battery 8 of this embodiment is mounted on the front chassis 1 and the above structure is applied to an electrically assisted tricycle, the reliability of the electrically assisted tricycle will be greatly improved, and the cycling experience will be greatly enhanced.

[0045] According to the above embodiment of the invention, the torque sensor 9 is provided with a torque actuation hole, the center shaft 41 is drilled into the torque actuation hole, and the center shaft 41 rotates to actuate the torque sensor. A torque sensor with this structure can be directly actuated by the rotating shaft, which is highly compatible with electric tricycles and contributes to simplifying the overall structure of the first torque output assembly 4.

[0046] <Example 2> This embodiment has almost the same structure as the first embodiment, except for the structure of the first torque output assembly 4, which includes a center shaft 41 rotatably mounted on the front chassis 1 and cranks 44 mounted on both ends of the center shaft 41, and the center shaft 41 is connected to the transmission shaft 6 by a first gear pair. The first torque output assembly 4 has a simple structure, requires fewer components, and is easy to assemble.

[0047] While embodiments of the present invention have been shown and described, those skilled in the art will recognize that changes can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is limited only by the appended claims and their equivalents.

Claims

1. A swingable shaft-drive tricycle, A swingable shaft-drive tricycle comprising a front chassis, a rear chassis, and a transmission mechanism, wherein a front wheel is provided on the front chassis, and two rear wheels are symmetrically provided on the rear chassis, and the front chassis is connected to the rear chassis by a swing mechanism, the transmission mechanism includes a first torque output assembly provided on the front chassis and a second torque output assembly provided on the rear chassis, the first torque output assembly transmitting torque to the second torque output assembly via a transmission shaft, and the second torque output assembly interlockingly engaging with at least one of the two rear wheels; a transmission through hole is provided at the center of the swing mechanism, the transmission shaft passes through the transmission through hole, and an axial line of the transmission shaft positioned in the transmission through hole overlaps with an axial line of the swing mechanism; the swing mechanism includes a first swing member, a second swing member, a connecting shaft, and an elastic block, the elastic block is engaged between the first swing member and the second swing member, the first swing member and the second swing member are rotatably connected to the connecting shaft by the connecting shaft such that the axis of the connecting shaft becomes the axis of the swing mechanism, the first swing member is connected to the front chassis, and the second swing member is connected to the rear chassis, and the transmission through hole is provided in the center of the connecting shaft.

2. 2. The oscillating shaft-drive tricycle according to claim 1, wherein the transmission shaft includes at least two stepped transmission shafts, and two adjacent stepped transmission shafts are connected by a universal joint.

3. 2. The oscillating shaft-drive tricycle of claim 1, wherein the transmission shafts include a first stepped transmission shaft, a second stepped transmission shaft, and a third stepped transmission shaft, the first stepped transmission shaft and the second stepped transmission shaft are connected by a first universal joint, the second stepped transmission shaft and the third stepped transmission shaft are connected by a second universal joint, the first stepped transmission shaft engages with the first torque output assembly, and the third stepped transmission shaft engages with the second torque output assembly.

4. 2. The oscillating shaft-drive tricycle of claim 1, wherein the front chassis includes an assembly mounting box and a hollow connecting beam provided in the assembly mounting box, one end of the hollow connecting beam is connected to the assembly mounting box and the other end of the hollow connecting beam is connected to the oscillating mechanism, the transmission shaft is drilled through the hollow connecting beam, and the first torque output assembly is provided in the assembly mounting box.

5. 2. The oscillating shaft drive tricycle of claim 1, wherein the rear chassis includes a wheel frame and a gearbox mounted on the wheel frame, the gearbox being connected to the oscillating mechanism, the second torque output assembly being mounted in the gearbox, and the rear wheels being mounted on the wheel frame.

6. 6. The oscillating shaft-drive tricycle of claim 5, wherein the wheel frame includes a frame, two wheel mounting members symmetrically mounted on the frame, and wheel transmission shafts mounted on the wheel mounting members, the rear wheels being mounted on the wheel transmission shafts, and the second torque output assembly being connected to at least one of the wheel transmission shafts.

7. 2. The oscillating shaft-drive tricycle of claim 1, wherein the first torque output assembly includes a center shaft rotatably mounted on the front chassis and cranks mounted on both ends of the center shaft, the center shaft being coupled to the transmission shaft by a first gear pair.

8. 2. The oscillating shaft-drive tricycle of claim 1, wherein the first torque output assembly includes a center axle and a rear axle rotatably mounted on the front chassis, a front sprocket mounted on the center axle, cranks mounted on both ends of the center axle, and a rear sprocket and a first bevel gear mounted on the rear axle, the front sprocket and the rear sprocket being interlocked with each other by a chain, a second bevel gear being mounted on the transmission shaft, and the first bevel gear meshing with the second bevel gear.

9. 2. The oscillating shaft-drive tricycle of claim 1, wherein the second torque output assembly includes a torque output shaft provided on the rear chassis, the transmission shaft is coupled to the torque output shaft by a second gear pair, a clutch assembly is provided between the transmission shaft and the second gear pair or between the torque output shaft and the second gear pair, and the torque output shaft is coupled to at least one of the two rear wheels.

10. 10. The oscillating shaft drive tricycle of claim 9, wherein the second gear pair includes third and fourth bevel gears that are meshed together, the fourth bevel gear being mounted on the torque output shaft, and the transmission shaft being coupled to the third bevel gear by a clutch assembly.

11. 11. The oscillating shaft drive tricycle of claim 10, wherein the clutch assembly includes a torque input shaft provided on the third bevel gear, a first face ratchet provided on the torque input shaft, an internally splined sleeve slidably engaged with the transmission shaft, and an elastic member that presses the internally splined sleeve to abut against the first face ratchet, one end of the torque input shaft is connected to the third bevel gear, the other end of the torque input shaft is provided with the first face ratchet, the outer wall of the transmission shaft is provided with external splines, the internally splined sleeve is slidably engaged with the external splines, and a second face ratchet is provided on the end of the internal spline sleeve opposite the first face ratchet, and the first face ratchet engages with the second face ratchet.

12. 12. The oscillating shaft-drive tricycle of claim 1, further comprising a storage battery provided on the front chassis or the rear chassis, a power assist motor provided on the front wheel, and a torque sensor provided within the first torque output assembly, wherein the torque sensor is electrically connected to the power assist motor, and the storage battery is connected to the torque sensor and the power assist motor.

Images