Multi-mode child bicycle

Abstract

A multi-mode child bicycle comprises a main frame and a transmission mechanism, and the rear end of the transmission mechanism is detachably connected with a rear wheel axle through a combined flywheel structure. The combined type flywheel structure comprises a flywheel body and a ratchet wheel assembly, the flywheel body is installed on a transmission mechanism of the bicycle, the ratchet wheel assembly is detachably connected to a rear wheel axle of the bicycle, and the flywheel body is detachably arranged on the ratchet wheel assembly in a sleeving mode. Due to the fact that the flywheel body and the ratchet wheel assembly are arranged in a split mode, the transmission mechanism can be directly taken down from the ratchet wheel assembly during disassembly, and no extra disassembly operation is needed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to bicycle technical field, concretely relates to a multi-mode children's bicycle. BACKGROUND

[0002] Children's bicycle is the best tool for outdoor exercise for children, and children of different ages use bicycles with different functions. For example, children aged 2-3 years old cannot pedal a bicycle, and generally use a sliding bicycle. Children aged 3-6 years old use a bicycle with pedals and a chain to ride and play.

[0003] In order to expand the use function of the bicycle, CN209719797 U discloses a bicycle, which comprises a front frame provided with a front wheel, a main frame rotatably connected to the front frame at the front, a seat provided on the main frame, and a rear wheel rotatably provided at the rear of the main frame around a rear wheel shaft. The bicycle further comprises a transmission device detachably mounted on the main frame, the transmission device comprising a pedal and a transmission assembly capable of driving the rear wheel to rotate through the pedal. The transmission device is detachably connected between the main frame and the rear wheel shaft. At least one of the connections between the transmission device and the main frame and between the transmission device and the rear wheel shaft is achieved by the locking device of the transmission device. The overall disassembly or installation process of the transmission device is very simple and convenient, so that the bicycle can be conveniently converted between the bicycle state and the load carrying state. In this structure, the driven shaft and the rear wheel shaft can be disassembled and assembled in the following way: during installation, first push the locking shaft inward to make the locking part disengage from the spring pin, then insert the driven shaft into the rear wheel shaft along the axial direction, and align the positioning column with the positioning groove one by one until the spring pin reaches the limiting surface, then loosen the locking shaft, and under the action of the spring force, the locking shaft slides to make the locking part abut against the spring pin, so that the spring pin remains in the locked state, realizing the installation of the driven shaft and the rear wheel shaft, and further enabling the driven shaft to drive the rear wheel shaft to rotate synchronously. During disassembly, the operator only needs to push the locking shaft inward to overcome the action of the spring and make the locking part disengage from the spring pin, then pull out the driven shaft outward, and the spring pin will automatically retract into the shaft body under the extrusion of the inner wall of the mounting hole to realize unlocking, so that the driven shaft can be completely disengaged from the mounting hole. This structure is relatively complex, inconvenient to disassemble and assemble, and unreliable to use. SUMMARY

[0004] To overcome the shortcomings of the prior art, the utility model provides a multi-mode children's bicycle, which is quickly disassembled and installed through the entire transmission mechanism, ensures the reliability of the function conversion of the bicycle, and can be used as a balance car and a riding bicycle.

[0005] The technical scheme adopted by the utility model is:

[0006] A multi-mode child bicycle comprises a main frame and a transmission mechanism, a front frame with a front wheel is mounted at the front end of the main frame, a seat is arranged on the main frame, a rear wheel rotatable around a rear wheel axle is mounted at the rear of the main frame, the front end of the transmission mechanism is detachably connected with the main frame, and the rear end of the transmission mechanism is detachably connected with the rear wheel axle through a combined freewheel structure.

[0007] Further, the combined freewheel structure comprises a freewheel body and a ratchet wheel assembly, the freewheel body is mounted in the transmission mechanism, the ratchet wheel assembly is detachably connected with the rear wheel axle, and the freewheel body is detachably sleeved on the ratchet wheel assembly.

[0008] Further, the freewheel body is provided with meshing internal teeth, the outer ring of the ratchet wheel assembly is provided with meshing external teeth, and the freewheel body drives the ratchet wheel assembly to rotate after being engaged with the meshing internal teeth and the meshing external teeth.

[0009] Further, the ratchet wheel assembly comprises a ratchet wheel seat, a ratchet wheel sleeve is sleeved outside the ratchet wheel seat, the meshing external teeth are arranged on the outer surface of the ratchet wheel sleeve, a ratchet wheel cover for axially fixing the ratchet wheel sleeve is mounted on one side of the ratchet wheel seat, and a circle of balls is arranged between the ratchet wheel sleeve and the ratchet wheel seat and the ratchet wheel cover, so as to ensure the smoothness of rotation of the ratchet wheel sleeve.

[0010] Further, the ratchet wheel seat is provided with a ratchet tooth, and a circumferential internal bevel tooth corresponding to the ratchet tooth is arranged in the ratchet wheel sleeve, the internal bevel tooth and the ratchet tooth cooperate to make the ratchet wheel sleeve rotate relative to the ratchet wheel seat in one direction.

[0011] Further, one side of the ratchet wheel seat is provided with a connecting part fixedly connected with the rear wheel axle, and the connecting part is threadedly connected with the rear wheel axle.

[0012] Further, the transmission mechanism comprises a bottom bracket and a chain, a middle shaft is arranged in the bottom bracket, left and right cranks for mounting pedals are arranged at the two ends of the middle shaft respectively, a toothed disc driven to rotate by the right crank is arranged on the right crank, the front end of the chain is sleeved on the toothed disc, and the rear end of the chain is sleeved on the freewheel body.

[0013] Further, the bottom bracket is detachably mounted on the bottom of the middle tube of the main frame.

[0014] Further, the chain, the sprocket, and the flywheel body are all installed in a chain cover, which is composed of a chain cover outer cover and a chain cover inner cover.

[0015] Further, the flywheel body is installed on a bearing seat through a bearing, and the bearing seat is fixed on the chain cover.

[0016] The utility model discloses the beneficial effects of:

[0017] 1, the transmission mechanism is detachably arranged, thereby making the bicycle have multiple modes, and the bicycle can be used as a riding bicycle after the transmission mechanism is installed, and the bicycle can be used as a balance car after the transmission mechanism is removed.

[0018] 2, the transmission mechanism is detachably arranged with the main frame through the combined flywheel structure, thereby when the rear end of the transmission mechanism is removed, the transmission mechanism can be directly removed from the ratchet combination part, and no additional removal operation is needed. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structure schematic diagram of the utility model.

[0020] Figure 2 It is the structure schematic diagram of the utility model when the transmission mechanism is not installed.

[0021] Figure 3 It is the structure schematic diagram of the utility model when the transmission mechanism is installed.

[0022] Figure 4 It is the structure schematic diagram of the combined flywheel structure of the utility model.

[0023] Figure 5 It is the explosion structure schematic diagram of the ratchet combination part of the utility model.

[0024] Figure 6 It is the explosion structure schematic diagram of the transmission mechanism of the utility model.

[0025] In the drawing: 1, main frame, 2, transmission mechanism, 3, front frame, 4, seat, 5, rear wheel axle, 6, rear wheel, 7, flywheel body, 8, ratchet combination part, 9, meshing inner tooth, 10, meshing outer tooth, 11, ratchet seat, 12, ratchet outer cover, 13, ratchet tooth, 14, inner bevel gear, 15, ratchet outer cover, 16, ball, 17, connecting part, 18, five-way seat, 19, chain, 20, middle shaft, 21, left crank, 22, right crank, 23, sprocket, 24, chain cover outer cover, 25, chain cover inner cover, 26, bearing, 27, bearing seat. DETAILED DESCRIPTION

[0026] The utility model will be further described below in conjunction with specific embodiments, but will not limit the utility model to these specific embodiments. Those skilled in the art should realize that the utility model covers all alternatives, improvements and equivalents that can be included in the scope of claims.

[0027] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise stated, the meaning of "multiple" is two or more, unless otherwise explicitly limited.

[0028] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0030] Referring to Figures 1-6This embodiment provides a multi-mode children's bicycle, including a main frame 1 and a transmission mechanism 2. The front end of the main frame 1 is equipped with a front frame 3 with a front wheel. The main frame 1 is provided with a seat 4. The rear end of the main frame 1 is equipped with a rear wheel 6 that can rotate around the rear wheel axle 5. The front end of the transmission mechanism 2 is detachably connected to the main frame 1, and the rear end of the transmission mechanism 2 is detachably connected to the rear wheel axle 5 through a combined flywheel structure.

[0031] The combined flywheel structure described in this embodiment includes a flywheel body 7 and a ratchet assembly 8. The flywheel body 7 is installed within the transmission mechanism 2, and the ratchet assembly 8 is detachably connected to the rear wheel axle 5. The flywheel body 7 is detachably fitted onto the ratchet assembly 8. This invention separates the flywheel body 7 and the ratchet assembly 8, so that during disassembly, the transmission mechanism can be directly removed from the ratchet assembly 8 without any additional disassembly operations.

[0032] In this embodiment, the flywheel body 7 and the ratchet assembly 8 are meshed together. The flywheel body 7 has internal meshing teeth 9, and the outer ring of the ratchet assembly 8 has external meshing teeth 10. The flywheel body 7 drives the ratchet assembly 8 to rotate through the meshing of the internal teeth 9 and the external teeth 10, thereby rotating the bicycle's rear wheel. The outer ring of the flywheel body 7 has chain teeth that mesh with the chain 19 of the transmission mechanism 2.

[0033] The ratchet assembly 8 described in this embodiment includes a ratchet seat 11, on which a ratchet outer sleeve 12 is fitted. Engaging external teeth 10 are disposed on the outer surface of the ratchet outer sleeve 12. Ratchets 13 are mounted on the ratchet seat 11, and a spring clip (not shown in the figure) is installed between the ratchet teeth 13 and the ratchet seat 11 to keep the ratchet teeth 13 in a convex state. The ratchet outer sleeve 12 has circumferentially oriented internal helical teeth 14 corresponding to the ratchet teeth 13. The internal helical teeth 14 engage with the ratchet teeth 13 to cause the ratchet outer sleeve 12 to rotate in one direction relative to the ratchet seat 11. A ratchet outer cover 15 is mounted on one side of the ratchet seat 11 to axially fix the ratchet outer sleeve 12. A ring of ball bearings 16 is provided between the ratchet outer sleeve 12, the ratchet seat 11, and the ratchet outer cover 15 to ensure smooth rotation of the ratchet outer sleeve 12.

[0034] In this embodiment, the ratchet seat 11 has a connecting part 17 on its other side, which is fixedly connected to the rear wheel axle 5. The connecting part 17 and the rear wheel axle 5 are threadedly connected. Specifically, the connecting part 17 may have an external thread, and the bicycle rear wheel axle may have an internal thread. The connection between the connecting part 17 and the rear wheel axle 5 is achieved through the cooperation of the external and internal threads. This utility model uses a threaded connection method to ensure that the connection between the connecting part and the bicycle rear wheel axle becomes increasingly tighter during bicycle riding, thereby ensuring the reliability of the connection.

[0035] The magnetic attraction structure can be arranged between the ratchet wheel assembly 8 and the flywheel body 7 to ensure the reliability of the connection between the ratchet wheel assembly 8 and the flywheel body 7.

[0036] The transmission mechanism 2 comprises a five-hole seat 18 and a chain 19, the five-hole seat 18 is detachably mounted on the middle tube bottom of the main frame 1, a middle shaft 20 is arranged in the five-hole seat 18, left and right cranks 21 and 22 for mounting pedals are arranged at the two ends of the middle shaft 20 respectively, a toothed disc 23 driven to rotate by the right crank 22 is arranged on the right crank 22, the front end of the chain 19 is sleeved on the toothed disc 23, and the rear end of the chain 19 is sleeved on the flywheel body 7.

[0037] The utility model discloses a balance car mode when not installing transmission mechanism, and riding mode when installing transmission mechanism.

[0038] The utility model discloses a bicycle is equipped with brake system.

[0039] When the transmission mechanism is installed, the flywheel body 7 has been installed in the transmission mechanism 2 and is connected in mesh with the chain, the ratchet wheel assembly 8 is connected to the rear wheel axle 5, and of course the ratchet wheel assembly 8 can also be directly fixed on the rear wheel axle 5. First, the transmission mechanism 2 is installed from the side, the flywheel body 7 is sleeved on the ratchet wheel assembly 8, the five-hole seat 18 is matched with the main frame 1, then the five-hole seat 18 is fixed on the middle tube of the main frame 1 through screws. When disassembling, first, the screws connecting the five-hole seat 18 and the main frame 1 are removed, the transmission mechanism 2 is taken out from the side, and the transmission mechanism 2 can be disassembled.

[0040] The transmission mechanism 2 can be detachably arranged, so that the bicycle has multiple modes, can be used as a riding bicycle after the transmission mechanism is installed, and can be used as a balance car after the transmission mechanism is disassembled. The transmission mechanism 2 is detachably arranged with the main frame through the split combined flywheel structure, so that when the rear end of the transmission mechanism is disassembled, the transmission mechanism is directly taken off from the ratchet wheel assembly, and no additional disassembly operation is needed.

Claims

1. A multi-mode child bicycle, comprising a main frame, a front frame with a front wheel mounted at the front end of the main frame, a seat arranged on the main frame, a rear wheel rotatable around a rear wheel axle mounted at the rear end of the main frame, and a transmission mechanism, the front end of the transmission mechanism being detachably connected to the main frame, characterized in that: The rear end of the transmission mechanism is detachably connected with the rear wheel axle through a combined flywheel structure.

2. A multi-mode children's bicycle according to claim 1, characterised in that: The combined flywheel structure comprises a flywheel body and a ratchet assembly, the flywheel body is installed in the transmission mechanism, the ratchet assembly is detachably connected with the rear wheel axle, and the flywheel body is detachably sleeved on the ratchet assembly.

3. A multi-mode children's bicycle according to claim 2, characterised in that: The flywheel body is provided with engaging inner teeth, the outer ring of the ratchet assembly is provided with engaging outer teeth, and the flywheel body drives the ratchet assembly to rotate through the engagement between the engaging inner teeth and the engaging outer teeth.

4. A multi-mode children's bicycle according to claim 3, characterised in that: The ratchet assembly comprises a ratchet seat, the ratchet seat is sleeved with a ratchet sleeve, the engaging outer teeth are arranged on the outer surface of the ratchet sleeve, an axial fixing ratchet sleeve is arranged on one side of the ratchet seat, and a ratchet cover is arranged on one side of the ratchet seat.

5. A multi-mode children's bicycle according to claim 4, characterised in that: The ratchet seat is provided with a ratchet tooth, the ratchet sleeve is provided with a circumferential inner bevel gear corresponding to the ratchet tooth, and the inner bevel gear cooperates with the ratchet tooth to drive the ratchet sleeve to rotate relative to the ratchet seat in one direction.

6. A multi-mode children's bicycle according to claim 4, characterised in that: One side of the ratchet seat is provided with a connecting part fixedly connected with the rear wheel axle, and the connecting part is threadedly connected with the rear wheel axle.

7. A multi-mode children's bicycle according to claim 1, characterized in that: The transmission mechanism comprises a five-way seat and a chain, the five-way seat is provided with a middle shaft, left and right cranks for installing pedals are arranged at both ends of the middle shaft, a toothed disc driven to rotate by the right crank is arranged on the right crank, the front end of the chain is sleeved on the toothed disc, and the rear end of the chain is sleeved on the flywheel body.

8. A multi-mode children's bicycle according to claim 7, characterised in that: The five-way seat is detachably installed on the bottom of the middle pipe of the main frame.

9. A multi-mode children's bicycle according to claim 7, characterized in that: The chain, the toothed disc and the flywheel body are installed in a chain cover, and the chain cover is composed of a chain cover outer cover and a chain cover inner cover.

10. A multi-mode children's bicycle according to claim 9, characterised in that: The flywheel body is installed on a bearing seat through a bearing, and the bearing seat is fixed on the chain cover.

Images