CN214029004U - Parent-child bicycle - Google Patents

Abstract

The utility model discloses a parent-child bicycle belongs to bicycle technical field, can not drive front wheel and rear wheel scheduling problem design respectively for solving current tandem bicycle. The parent-child bicycle comprises a frame main body consisting of a front side frame component and a rear side frame component, wherein the front side frame component also comprises a front side transmission structure, and the front side transmission structure is configured to transmit the rotation of a front side pedal shaft to a front side wheel so as to drive the front side wheel to rotate; the rear side frame assembly includes a rear side transmission structure configured to transmit rotation of the rear side pedal shaft to the rear side wheel to drive rotation of the rear side wheel. When the parent and child ride together, the child treads the pedal arranged on the front pedal shaft, and the power is transmitted to the front wheel; parents trample the running-board of installation on rear side pedal axle, and power passes to the rear wheel, and parents and child can do all can not exert oneself jointly in the mutual noninterference, lets child obtain better exercise.

Description

Parent-child bicycle

Technical Field

The utility model relates to the technical field of bicycles, especially, relate to a parent-child bicycle.

Background

With the gradual progress of education concept, the child care is no longer required to provide physical life support for the children, but is required to accompany the children more. The green-stepping playing, the physical training and the like are good parent-child activities, and the intimacy between parents and children can be improved.

The existing tandem bicycle is generally designed for adults, the key point of the design is that the bicycle is labor-saving to ride or can be folded to store so as to save storage space, the use requirement of one person who rides a traveler for teenagers and children can not be considered, and the existing tandem bicycle is difficult to be used as a means of transportation for family outing.

Specifically, two riders of the existing tandem bicycle converge the force generated by the pedals together to drive the bicycle to run, the strength of a child is obviously less than that of a parent when the parent and the child ride the bicycle simultaneously, and the final result is that the parent rides the bicycle by himself and does not exercise enough for the child; the existing tandem bicycle is controlled to turn by a rider sitting on a front seat, a child basically sits on the front seat for safety when the parent and the child ride simultaneously, and if the child controls the turning and a parent cannot control the riding direction, the riding safety cannot be guaranteed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a parent-child bicycle, child and head of a family can drive front wheel and rear wheel rotation respectively, for child provides more exercise opportunities, the head of a family can real time monitoring child and control direction, ensures the safety of riding. .

To achieve the purpose, the utility model adopts the following technical proposal:

a parent-child bicycle comprising a frame body consisting of a front side frame assembly and a rear side frame assembly, the front side frame assembly comprising a front side frame, a front side handle, a front side wheel, a front side pedal shaft and a front side seat, the rear side frame assembly comprising a rear side frame, a rear side handle, a rear side wheel, a rear side pedal shaft and a rear side seat, the front side frame assembly further comprising a front side transmission structure configured to transmit rotation of the front side pedal shaft to the front side wheel to drive the front side wheel to rotate; the rear side frame assembly includes a rear side transmission structure configured to transmit rotation of the rear side step axle to the rear side wheel to drive rotation of the rear side wheel.

In particular, the front side transmission structure and the rear side transmission structure are respectively a gear engagement transmission member or a chain sprocket transmission member.

Especially, the front side drive structure is including setting up epaxial step shaft bevel gear of front side pedal, with the step shaft bevel gear engaged with primary bull stick pedal end bevel gear, through primary bull stick with primary bull stick handrail end bevel gear that primary bull stick pedal end bevel gear is connected, with primary bull stick handrail end bevel gear engaged with steering shaft bevel gear, with the coaxial steering shaft straight-teeth gear that sets up of steering shaft bevel gear, with the meshing secondary bull stick straight-teeth gear of steering shaft straight-teeth gear, through secondary bull stick with secondary bull stick bevel gear that secondary bull stick straight-teeth gear is connected and with secondary bull stick bevel gear engaged with front wheel axle bevel gear, front wheel axle bevel gear cover is established on front wheel axle subassembly, steering shaft bevel gear with straight-teeth shaft gear cover is established on the steering shaft.

In particular, the rear transmission structure includes a rear pedal shaft bevel gear provided on the rear pedal shaft, a rear driving pivot rod pedal end bevel gear engaged with the rear pedal shaft bevel gear, a rear driving pivot rod wheel end bevel gear connected to the rear driving pivot rod pedal end bevel gear through a rear driving pivot rod, and a rear wheel shaft bevel gear engaged with the rear driving pivot rod wheel end bevel gear, the rear wheel shaft bevel gear being provided on the rear wheel shaft assembly.

Particularly, a rear side steering shaft is arranged in a rear handrail supporting tube of the rear side handrail, a rear steering gear is sleeved on the rear side steering shaft and meshed with a steering transition gear, the steering transition gear is meshed with a front steering gear, two steering steel ropes are sleeved on the front steering gear, one ends of the steering steel ropes, far away from the front steering gear, are connected to the steering shaft, and the steering shaft penetrates through a front handrail supporting tube of the front side handrail.

Particularly, a folding mechanism is arranged at the joint of the front side frame assembly and the rear side frame assembly, the folding mechanism comprises a hollow folding main body, a folding cover plate hinged with the folding main body, and a folding hinge shaft for hinging the folding main body and the folding cover plate together, the folding main body is connected with one of the front side frame and the rear side frame, and the folding cover plate is connected with the other of the front side frame and the rear side frame; the steering transition gear is arranged in the folding main body, a folding main body through hole is formed in the folding main body, and the steering transition gear is meshed with the rear steering gear or the front steering gear through the folding main body through hole.

Particularly, the front side handrail is provided with an insertion hole for inserting a steering key, the steering shaft is provided with a hollow plate, and the hollow plate is provided with a locking hole and a free rotation hole; when the steering key is inserted into the locking hole, the front side armrest and the steering shaft can synchronously rotate, and when the steering key is inserted into the free rotation hole, the front side armrest can freely rotate relative to the steering shaft.

In particular, the steering key comprises a cylindrical key cylinder, a handheld part arranged at the top end of the key cylinder and a bump arranged at the bottom end of the key cylinder, wherein the bump is eccentrically arranged relative to the key cylinder; the shape of the locking hole is the same as the cross section of the lug, and the free rotation hole can allow the lug to freely rotate in a set angle.

Particularly, the frame main body comprises one front side frame assembly and two rear side frame assemblies which are detachably arranged, the two rear side frame assemblies are connected through a connecting cross beam, and the two rear side frame assemblies which are connected into a whole are connected with the front side frame assembly through a herringbone beam.

Particularly, a rear steering shaft is arranged in a rear armrest supporting tube of one of the two rear frame assemblies, a side steering gear is sleeved on the rear steering shaft and connected to a rear steering gear through a side steering steel rope, the rear steering gear is meshed with a steering transition gear, the steering transition gear is meshed with a front steering gear, two steering steel ropes are sleeved on the front steering gear, one end, far away from the front steering gear, of each steering steel rope is connected to the steering shaft, and the steering shaft penetrates through a front armrest supporting tube of the front armrest.

The utility model discloses parent-child bicycle includes can transmit the rotation of front side pedal shaft to the front side wheel in order to drive the front side wheel to rotate and be used for transmitting the rotation of rear side pedal shaft to the rear side wheel in order to drive the rear side wheel to rotate and drive the rear side transmission structure, child tramples the running-board of installation on front side pedal shaft when parent-child rides jointly, power transmits to the front wheel; the parents step on the pedal plate arranged on the rear side pedal shaft, the power is transmitted to the rear wheel, the parents and the children can exert force together without mutual interference, so that the children can get better exercise, and the intimacy between the parents and the children is improved; the bicycle can also be combined into a three-wheel bicycle for three persons to ride for the three families to ride together; the parent-child bicycle is foldable, has small volume after being folded, and can be transported in long-distance transport tools such as automobiles and the like; the child sits in front of the bicycle, so that parents can conveniently observe the behaviors of the child, the safety of the child is ensured, and the parents sitting behind the bicycle control the steering of the bicycle, so that the bicycle is safer to ride; according to the user demand, the child can also steer through the handrail control in the front, the use modes are flexible and various, and the switching between the use modes is more convenient.

Drawings

Fig. 1 is a schematic structural view of a two-wheeled parent-child bicycle according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a front side transmission structure and a rear control steering structure according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a rear side transmission configuration according to an embodiment of the present invention;

fig. 4 is an exploded view of a folding mechanism provided in accordance with an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a steering key according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a steering shaft and a front armrest support tube according to an embodiment of the present invention;

fig. 7 is a plan view of a steering shaft according to an embodiment of the present invention;

FIG. 8 is a schematic structural view of another two-wheeled parent-child bicycle according to an embodiment of the present invention;

FIG. 9 is a schematic view of the rear steering control structure of the two-wheeled parent-child bicycle shown in FIG. 8;

FIG. 10 is a schematic structural view of a three-person three-wheeled parent-child bicycle according to an embodiment of the present invention;

fig. 11 is a schematic structural view of a herringbone beam provided by an embodiment of the present invention;

fig. 12 is a schematic structural view of a rear steering control structure of a three-person three-wheeled parent-child bicycle according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

The present embodiment discloses a parent-child bicycle, which includes a frame main body composed of a front side frame assembly and a rear side frame assembly, as shown in fig. 1 to 12. Wherein, the front side frame component comprises a front side frame 11, a front side handrail 12, a front side wheel 13, a front side pedal shaft 14 and a front side seat 15, and the rear side frame component comprises a rear side frame 21, a rear side handrail 22, a rear side wheel 23, a rear side pedal shaft 24 and a rear side seat 25. The front seat 15 is set to be short or adjustable in height to accommodate the height of a juvenile; the front pedal shaft 14 is provided on the front frame 11 closer to the front seat 15, so that a child with legs not long enough can ride easily. The front wheel and the rear wheel can be provided with a soft rope brake mechanism.

The front side frame assembly further includes a front side transmission structure configured to transmit rotation of the front side pedal shaft 14 to the front side wheel 13 to drive the front side wheel 13 to rotate; the rear side frame assembly includes a rear side transmission structure configured to transmit rotation of the rear side pedal shaft 24 to the rear side wheels 23 to drive the rotation of the rear side wheels 23.

When the parent and the child ride together, the child treads the pedal arranged on the front side pedal shaft 14, and the power is transmitted to the front wheel; the parents step on the pedal plate arranged on the rear pedal shaft 24, the power is transmitted to the rear wheel, the parents and the children can exert force together without mutual interference, the children can get better exercise, and the intimacy between the parents and the children is improved.

In order to avoid the inconsistent rotation speed of the front and rear wheels causing the rotation speed of the front pedal shaft 14 to exceed the speed of the child actively stepping on the pedal, a structure which can rotate in one direction, such as a flywheel, can be arranged on the front wheel shaft assembly 17. When a child steps on the pedal, power is transmitted to the front axle assembly 17 and the front side wheels 13 normally rotate. When the head of a family steps on the running-board with faster speed, rear side wheel 23 high-speed revolution leads to front side wheel 13 also along with high-speed revolution, and one-way rotating structure plays a role this moment, and high-speed revolution's front side wheel 13 can not be with power reversal on transmitting front side pedal shaft 14 through front side transmission structure, guarantees child's safety.

The specific devices of the front side transmission structure and the rear side transmission structure are not limited, and power transmission can be realized. Preferably, the front side transmission structure and the rear side transmission structure are respectively gear meshing transmission parts or chain and chain wheel transmission parts, the cost is low, the use state is stable, and the process is mature.

In the present embodiment, the front-side transmission structure and the rear-side transmission structure are both gear-meshing transmission members, for example. As shown in fig. 1 and 2, the front side transmission structure includes a pedal shaft bevel gear 161 provided on the front side pedal shaft 14, a primary swing shaft pedal end bevel gear 162 engaged with the pedal shaft bevel gear 161, a primary swing shaft handrail end bevel gear 164 connected with the primary swing shaft pedal end bevel gear 162 through a primary swing shaft 163, a steering shaft bevel gear 165 engaged with the primary swing shaft handrail end bevel gear 164, a steering shaft spur gear 166 coaxially provided with the steering shaft bevel gear 165, a secondary swing shaft spur gear 167 engaged with the steering shaft spur gear 166, a secondary swing shaft bevel gear 169 connected with the secondary swing shaft spur gear 167 through a secondary swing shaft 168, and a front wheel shaft bevel gear 170 engaged with the secondary swing shaft bevel gear 169. Wherein, the front wheel shaft bevel gear 170 is sleeved on the front wheel shaft assembly 17, and the steering shaft bevel gear 165 and the steering shaft straight gear 166 are sleeved on the steering shaft 18.

The pedal shaft bevel gear 161 and the primary turning bar pedal end bevel gear 162 constitute a first group of gear engagement structure for turning the rotation on the front pedal shaft 14; the rotation is transmitted to the front gearbox 19 through the primary rotating rod 163, the bevel gear 164 at the handrail end of the primary rotating rod and the bevel gear 165 of the steering shaft in the front gearbox 19 form a second group of gear meshing structures, and the second group of bevel gear meshing structures redirect the rotation again to form the rotation which vertically passes through the center of the front side wheel 13 and is in the same plane with the front side wheel 13; the steering shaft straight gear 166 and the secondary rotating rod straight gear 167 form a third group of gear meshing structure, the rotating power is transmitted to the front fork 10 on the single side, the secondary rotating rod 168 is arranged in the front fork 10, the secondary rotating rod 168 transmits the power to a fourth group of gear meshing structure formed by a secondary rotating rod bevel gear 169 and a front wheel shaft bevel gear 170, the fourth group of gear meshing structure changes the direction of the rotation again, the front wheel shaft bevel gear 170 drives a flywheel arranged on the side edge of the front wheel, and the flywheel with the one-way driving function drives the front wheel 13 to roll forwards.

The power transmission is smoother through the change of the four groups of gear meshing structures to the rotating direction, and a gear of the second group of bevel gear meshing structures and a gear of the third group of gear meshing structures are both arranged on the steering shaft 18, so that when the front side wheels 13 are controlled by parents to steer from the rear, the driving force for the child to ride is not interrupted, and the use is more convenient.

The specific structure for implementing the function of controlling the direction turning by the parent from the rear is not limited, preferably, a rear steering shaft 28 is provided in the rear armrest support tube 221 of the rear armrest 22, a rear steering gear 31 is sleeved on the rear steering shaft 28, the rear steering gear 31 is meshed with a steering transition gear 32, the steering transition gear 32 is meshed with a front steering gear 33, two steering steel cables 34 are sleeved on the front steering gear 33, one end of the steering steel cable 34 far away from the front steering gear 33 is connected to the steering shaft 18, and the steering shaft 18 is inserted into the front armrest support tube 121 of the front armrest 12. Two steering cables 34 are respectively located on the left and right sides of the axis of the steering shaft 18, and when the rear armrest 22 is rotated to the left or right, the left or right steering cables 34 can be pulled through the rear steering gear 31, the steering transition gear 32, and the front steering gear 33, thereby rotating the steering shaft 18 to the left or right.

The structure of the gear, the steering steel rope 34 and the like is built-in, the appearance is more attractive, the structure can be prevented from being hooked or damaged by external force, and the use is safer.

Of course, other configurations are possible that enable the parent to control the direction from the rear. For example, two soft ropes are used as the steering cables, one soft rope having both ends connected to the left side of the rear armrest 22 and the left side of the steering shaft 18, respectively, and the other soft rope having both ends connected to the right side of the rear armrest 22 and the right side of the steering shaft 18, respectively. When the back handrail 22 is rotated to the left or right by the household, the steering shaft 18 is rotated to the left or right by the corresponding side rope, thereby realizing steering. The tail end of the soft rope can be adjusted in tightness by arranging a spring, so that labor is saved during use.

As shown in fig. 3, the rear side transmission structure includes a rear side pedal shaft bevel gear 261 provided on the rear side pedal shaft 24, a rear side drive rotor pedal end bevel gear 262 engaged with the rear side pedal shaft bevel gear 261, a rear side drive rotor wheel end bevel gear 264 connected to the rear side drive rotor pedal end bevel gear 262 through a rear side drive rotor 263, and a rear axle bevel gear 265 engaged with the rear side drive rotor wheel end bevel gear 264, the rear axle bevel gear 265 being provided on the rear axle assembly 27.

The rear pedal shaft bevel gear 261 and the rear driving turn lever pedal end bevel gear 262 constitute a fifth group gear meshing structure for changing the direction of rotation on the rear pedal shaft 24; the rear side driving turn bar 263 transmits the backward-changed rotation to a sixth gear meshing structure composed of a rear side driving turn bar wheel end bevel gear 264 and a rear wheel shaft bevel gear 265, the rotation is changed again, and then a flywheel installed at the side of the rear wheel is driven, and the flywheel with the one-way driving function drives the rear side wheel 23 to roll forward.

In order to save the storage space, a folding mechanism is arranged at the joint of the front side frame component and the rear side frame component. As shown in fig. 1 and 4, the folding mechanism includes a hollow folding body 41, a folding lid 42 hinged to the folding body 41, and a folding hinge shaft 43 for hinging the folding body 41 and the folding lid 42 together. The folder body 41 is coupled to one of the front side frame 11 and the rear side frame 21, and the folder cover 42 is coupled to the other, the folder cover 42 and the folder body 41 being smoothly rotatable about the folder hinge axis 43.

In the present embodiment, the folding body 41 is connected to the rear side frame 21, and the folding cover 42 is connected to the front side frame 11. The steering transition gear 32 and the rear steering gear 31 are provided in the folding body 41, and the front steering gear 33 is provided in the tube of the front side frame 11. The folding body 41 is provided with a folding body through hole 411, and the steering transition gear 32 is engaged with the front steering gear 33 through the folding body through hole 411. After the folding mode is used, the steering device cannot be damaged during folding, and the folding device is convenient to operate, time-saving, labor-saving, convenient to carry and store; during assembly, only a little attention needs to be paid to the meshing condition of the gears and the folding cover plate 42 and the folding main body 41 are locked, and the normal operation of the steering mechanism can be ensured without complicated operation.

Steering from the rear by the parent, rather than the child from the front, is for safety reasons and is not necessary. When the child has good judgment capability and direction control capability, the steering mechanism can be controlled by the child or the parent and the child can control the steering mechanism together.

To achieve this, as shown in fig. 1 and 5 to 7, the front side handle 12 is provided with an insertion hole for inserting the steering key 5, the front side handle 12 and the steering shaft 18 can be rotated in synchronization when the steering key 5 is inserted into the insertion hole in the first direction, and the front side handle 12 can be freely rotated (idly rotated) with respect to the steering shaft 18 when the steering key 5 is inserted into the insertion hole in the second direction.

The specific shape of the steering key 5 is not limited, and preferably, the steering key 5 includes a cylindrical key cylinder 51, a handle 52 disposed at the top end of the key cylinder 51, and a protrusion 53 disposed at the bottom end of the key cylinder 51, the protrusion 53 being eccentrically disposed with respect to the key cylinder 51; the steering shaft 18 is provided with a hollow plate 181, the hollow plate 181 is formed with a locking hole 182 and a free rotation hole 183, the shape of the locking hole 182 is the same as the cross section of the projection 53, and the free rotation hole 183 allows the projection 53 to freely rotate therein at a set angle.

As a further method for parental control of steering from behind, as shown in fig. 8 and 9, the rear side frame assembly includes a rear wheel carrier axle 29 rotatable about its own axis, the rear wheel carrier axle 29 being attached to the rear side frame 21, and the rear side wheels 23 being mounted on the rear wheel carrier axle 29 via some frame structure and being rotatable in synchronism with the rear wheel carrier axle 29. A gear transmission assembly with the same structure as the front side transmission assembly is arranged on the rear side frame assembly, and a parent treads a rear side pedal shaft 24 to drive a rear side wheel 23 to rotate through the gear transmission assembly so as to normally ride forwards; when the parent turns the rear armrest 22, a cable (not shown) provided in the rear frame 21 pulls the rear wheel frame shaft 29 to twist about the axis (see the action of the steering cable 34 and the steering shaft 18 of the front frame assembly), so that the rear wheels 23 are in a plane that forms an angle with the forward direction. The same as the working principle of the front side transmission structure, the gear transmission assembly of the rear side frame assembly ensures that the torsion of the rear side wheel 23 does not affect the normal riding of parents, and the torsion of the rear side wheel 23 enables the bicycle in riding to change the advancing direction, so that the parents can control the riding direction from the rear.

The parent-child bicycle shown in fig. 1 is a two-wheel structure for two people to ride simultaneously, and considering the use requirements of a family of three people, the frame body can also be as shown in fig. 10, and comprises a front side frame component and two rear side frame components which are detachably arranged to form a three-person three-wheel parent-child bicycle. The two rear side frame components are connected through a connecting cross beam 61, and the two rear side frame components after being connected into a whole are connected with the front side frame component through a herringbone beam 62. The structure and the working principle of the two rear side frame components are the same as those of the rear side frame components in the two-person two-wheel parent-child bicycle.

As shown in fig. 11, the chevron beam 62 includes two rear side catches 621 and one front side catch 622, the rear side catch 621 catching on the connecting cross member 61, and the front side catch 622 catching on the front side car frame 11. When a three-person tricycle needs to be refitted into a two-person tricycle, the connecting cross beam 61 and the herringbone beam 62 are removed, and the rear side frame 21 is connected to the folding mechanism, so that the disassembly and the assembly are convenient.

Fig. 12 shows a rear steering control scheme of a three-wheel parent-child bicycle, wherein a rear steering shaft 28 is arranged in a rear armrest support tube 221 of one of two rear frame components, a side steering gear 35 is sleeved on the rear steering shaft 28, and the side steering gear 35 is connected to a rear steering gear 31 through a side steering steel cable 36. The rest parts are the same as the scheme of controlling the steering at the back of the two-person two-wheeled parent-child bicycle, and the detailed description is omitted here.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. Parent-child bicycle comprising a frame body consisting of a front side frame assembly and a rear side frame assembly, said front side frame assembly comprising a front side frame (11), a front side handle (12), a front side wheel (13), a front side pedal shaft (14) and a front side seat (15), said rear side frame assembly comprising a rear side frame (21), a rear side handle (22), a rear side wheel (23), a rear side pedal shaft (24) and a rear side seat (25), characterized in that said front side frame assembly further comprises a front side transmission structure configured to transmit the rotation of said front side pedal shaft (14) to said front side wheel (13) to drive said front side wheel (13) to rotate; the rear side frame component comprises a rear side transmission structure which is configured to transmit the rotation of the rear side pedal shaft (24) to the rear side wheel (23) to drive the rear side wheel (23) to rotate.

2. The parent-child bicycle according to claim 1, wherein the front side transmission structure and the rear side transmission structure are respectively a gear mesh transmission or a chain sprocket transmission.

3. The parent-child bicycle according to claim 1, wherein the front side transmission structure includes a pedal shaft bevel gear (161) provided on the front side pedal shaft (14), a primary turn lever pedal end bevel gear (162) engaged with the pedal shaft bevel gear (161), a primary turn lever handrail end bevel gear (164) connected to the primary turn lever pedal end bevel gear (162) through a primary turn lever (163), a turn shaft bevel gear (165) engaged with the primary turn lever handrail end bevel gear (164), a turn shaft spur gear (166) coaxially provided with the turn shaft bevel gear (165), a secondary turn lever spur gear (167) engaged with the turn shaft spur gear (166), a secondary turn lever bevel gear (169) connected to the secondary turn lever spur gear (167) through a secondary turn lever (168), and a front wheel shaft (170) engaged with the secondary turn lever bevel gear (169), the front wheel shaft bevel gear (170) is sleeved on the front wheel shaft assembly (17), and the steering shaft bevel gear (165) and the steering shaft straight gear (166) are sleeved on the steering shaft (18).

4. The parent-child bicycle according to claim 1, wherein the rear side transmission structure includes a rear side pedal shaft bevel gear (261) provided on the rear side pedal shaft (24), a rear side driving turn lever pedal end bevel gear (262) engaged with the rear side pedal shaft bevel gear (261), a rear side driving turn lever wheel end bevel gear (264) connected to the rear side driving turn lever pedal end bevel gear (262) through a rear side driving turn lever (263), and a rear wheel shaft bevel gear (265) engaged with the rear side driving turn lever wheel end bevel gear (264), the rear wheel shaft bevel gear (265) being provided on the rear wheel shaft assembly (27).

5. The parent-child bicycle according to any one of claims 1 to 4, wherein a rear steering shaft (28) is arranged in a rear handrail support tube (221) of the rear handrail (22), a rear steering gear (31) is sleeved on the rear steering shaft (28), the rear steering gear (31) is meshed with a steering transition gear (32), the steering transition gear (32) is meshed with a front steering gear (33), two steering steel ropes (34) are sleeved on the front steering gear (33), one ends of the steering steel ropes (34) far away from the front steering gear (33) are connected to a steering shaft (18), and the steering shaft (18) is arranged in a front handrail support tube (121) of the front handrail (12) in a penetrating manner.

6. The parent-child bicycle according to claim 5, wherein a folding mechanism is provided at the junction of the front side frame assembly and the rear side frame assembly, the folding mechanism including a hollow folding body (41), a folding cover (42) hinged to the folding body (41), and a folding hinge shaft (43) hinging the folding body (41) and the folding cover (42) together, the folding body (41) being connected to one of the front side frame (11) and the rear side frame (21), the folding cover (42) being connected to the other of the front side frame assembly and the rear side frame assembly; the steering transition gear (32) is arranged in the folding main body (41), a folding main body through hole (411) is formed in the folding main body (41), and the steering transition gear (32) is meshed with the rear steering gear (31) or the front steering gear (33) through the folding main body through hole (411).

7. The parent-child bicycle according to claim 5, wherein the front side handrail (12) is provided with an insertion hole for inserting a steering key (5), the steering shaft (18) is provided with a hollow plate (181), and the hollow plate (181) is provided with a locking hole (182) and a free rotation hole (183); the front side arm rest (12) and the steering shaft (18) can be synchronously rotated when the steering key (5) is inserted into the locking hole (182), and the front side arm rest (12) can be freely rotated relative to the steering shaft (18) when the steering key (5) is inserted into the free rotation hole (183).

8. Parent-child bicycle according to claim 7, characterized in that the steering key (5) comprises a cylindrical key shaft (51), a hand-held portion (52) arranged at the top end of the key shaft (51), and a cam (53) arranged at the bottom end of the key shaft (51), the cam (53) being eccentrically arranged with respect to the key shaft (51); the locking hole (182) has the same shape as the cross section of the projection (53), and the free rotation hole (183) allows the projection (53) to freely rotate therein by a set angle.

9. Parent-child bicycle according to any of claims 1-4, characterized in that the frame body comprises one front side frame assembly and two rear side frame assemblies detachably arranged, the two rear side frame assemblies are connected by a connecting cross beam (61), and the two rear side frame assemblies connected after integration are connected with the front side frame assembly by a herringbone beam (62).

10. The parent-child bicycle according to claim 9, wherein a rear steering shaft (28) is arranged in a rear armrest support tube (221) of one of the two rear frame assemblies, a side steering gear (35) is sleeved on the rear steering shaft (28), the side steering gear (35) is connected to a rear steering gear (31) through a side steering steel cable (36), the rear steering gear (31) is meshed with a steering transition gear (32), the steering transition gear (32) is meshed with a front steering gear (33), two steering steel cables (34) are sleeved on the front steering gear (33), one ends of the steering steel cables (34) far away from the front steering gear (33) are connected to a steering shaft (18), and the steering shaft (18) is arranged in a front armrest support tube (121) of the front armrest (12) in a penetrating mode.

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