Multifunctional baby stroller

Abstract

The invention discloses a multifunctional child stroller which comprises a crankshaft, a stroller underframe, a crank, a bearing body and a rocker. One end of the crank is fixedly connected with the crankshaft, and the other end of the crank is in pin joint with the bearing body; the bottom end of the rocker is in pin joint with the vehicle underframe, and the top end is in pin joint with the bearing body; a seat is arranged on the bearing body; the crank shaft is positioned below the seat; when the pin joint axis of the crank is the highest, the vertical distance H between the top pin joint axis and the bottom pin joint axis of the rocker is greater than or equal to the eccentric distance of the crank; the eccentric distance of the crank ranges from 20 mm to 60 mm, and the maximum pitch angle theta of the seat face of the seat 5 ranges from 0 degree to 30 degrees. On the premise that interestingness of the cart is kept, safety and comfort of the cart are further guaranteed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of children's car, and particularly relates to a multifunctional children's car. BACKGROUND

[0002] In the field of children's products, traditional children's car generally adopts a translation type walking structure, and its pushing track is stable but lacks interest. In order to improve the riding experience of infants and young children, a children's car with a dynamic undulating function appears in the prior art, for example, a new children's car with dynamic and flat walking disclosed in Chinese patent CN101492066A. The children's car converts the translation movement of the wheels into the undulating swing movement of the carrier through the mechanical linkage of the crank shaft, connecting rod and carrier, realizes the switching between the flat walking mode and the dynamic mode, and enhances the riding pleasure of infants and young children.

[0003] However, the prior art still has the following defects. In the dynamic mode, the eccentricity of the crank (i.e. the crank rotation radius) directly affects the movement amplitude of the carrier. If the eccentricity is too large and the carrier has too large a pitch angle, it is easy to cause the risk of falling of infants and young children, and there is a risk of overturning when turning or on a bumpy road, and at the same time, a large design space needs to be avoided on a small children's car, such as increasing the height of the seat to avoid interference between the crank and the ground. However, in order to adapt to the height of the child, the height of the seat cannot be too high. If the eccentricity is too small, the undulating amplitude is insufficient, and it is difficult to achieve the effect of simulating horse riding, which weakens the interest of the dynamic mode. SUMMARY

[0004] Therefore, the present application provides a multifunctional children's car, which further guarantees the safety and comfort of the car while retaining the interest of the car.

[0005] The present application is realized by the following technical solutions:

[0006] A multifunctional children's car, comprising a crank shaft, a car chassis, a crank, a carrier and a rocker;

[0007] The crank shaft is rotationally arranged on the car chassis, one end of the crank is fixedly connected with the crank shaft, and the other end is pinned to the carrier; the bottom end of the rocker is pinned to the car chassis, and the top end is pinned to the carrier;

[0008] The carrier is provided with a seat; the crank shaft is located below the seat;

[0009] When the pinning axis of the crank is at the highest position, the vertical distance H between the pinning axis of the top of the rocker and the pinning axis of the bottom is greater than or equal to the eccentricity of the crank;

[0010] The eccentricity of the crank ranges from 20mm to 60mm, and the maximum pitch angle θ of the seat surface ranges from 0° to 30°.

[0011] Further, the horizontal distance D between the bottom pin joint axis of the rocker and the axis of the crankshaft ranges from 200 mm to 400 mm.

[0012] Further, the vertical projection length H of the distance between the top pin joint axis of the rocker and the bottom pin joint axis ranges from 20 mm to 340 mm.

[0013] Further, a buffer spring is arranged between the carrier and the vehicle chassis.

[0014] Further, the drive wheel, the drive shaft and the transmission mechanism are further included.

[0015] The drive shaft is rotatably arranged on the vehicle chassis, the drive wheel is a rear wheel of the rocking car, and the drive wheel is coaxially connected with the drive shaft; the drive shaft drives the crankshaft and the crank to rotate through the transmission mechanism.

[0016] Further, the driving wheel is a driving gear, the driven wheel is a driven gear, and the transmission member is an idle gear.

[0017] The driving gear is arranged on the drive shaft through a long key, and the driving gear is movable along the axial direction of the drive shaft; the driven gear is arranged on the crankshaft, and the driving gear and the driven gear are engaged through the idle gear.

[0018] The drive shaft is externally sleeved with an idle gear frame, and the idle gear is rotatably arranged on the idle gear frame.

[0019] The idle gear frame is rotatable along the drive shaft or movable along the axial direction of the drive shaft, and when the walking mode of the rocking car is converted, the idle gear frame is pulled or moved to make the idle gear engage or disengage with the driven gear.

[0020] Further, a sliding sleeve is coaxially arranged on the drive shaft; a guide block is fixedly arranged on the drive shaft, and a guide groove I is arranged on the inner circumference of the sliding sleeve, so that the sliding sleeve is slidable along the drive shaft.

[0021] The driving wheel is rotatably connected with the drive shaft,

[0022] The driving wheel is rotatably connected with the drive shaft,

[0023] The driven wheel is coaxially and fixedly arranged on the crankshaft, and the driving wheel and the driven wheel are driven through the transmission member.

[0024] When the walking mode of the rocking car is converted, the sliding sleeve is pulled to make the sliding sleeve engage or disengage with the driving wheel.

[0025] Further, the driving wheel is provided with a clutch mechanism for controlling synchronous rotation or disengagement of the driving wheel and the driving shaft.

[0026] Advantages:

[0027] (1) The multifunctional stroller provided by the application can ensure moderate movement amplitude of the stroller and prevent excessive swinging by simultaneously limiting the eccentricity of the crank and the pitch angle of the carrier, can produce obvious undulating feeling and enhance interest, and will not be too intense, thus ensuring the safety and comfort of the infant.

[0028] (2) The crank shaft, the stroller chassis, the rocker and the carrier form a crank rocker structure or a double crank structure in the application, and the horizontal distance D between the axis of the rocker bottom pin joint shaft and the axis of the crank shaft has a greater influence on the pitch angle after the eccentricity of the crank is relatively determined, and the range of the horizontal distance D is set to 200mm-400mm in the application, which is convenient for the design of the pitch angle.

[0029] (3) The projection length H of the rocker in the vertical direction is 20mm-340mm in the application, which quantifies the geometric constraints between the crank shaft, the stroller chassis, the rocker and the carrier, and is convenient for the overall design of the stroller.

[0030] (4) The carrier and the stroller chassis are provided with a buffer spring, which can buffer the descent of the carrier.

[0031] (5) The driving wheel is provided with a plurality of circumferentially distributed guide bosses at one end thereof, and the sliding sleeve II is provided with a plurality of circumferentially distributed guide grooves II at one end thereof, which can realize smooth cooperation of the sliding sleeve II and the driving wheel, and the plurality of guide bosses and grooves are in contact sliding, and the stress is uniform. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structural diagram of the stroller (the carrier is not drawn) of the application;

[0033] Figure 2 It is a simplified diagram of the crank rocker structure of the application;

[0034] Figure 3 It is an example diagram of a transmission mechanism of the application;

[0035] Figure 4 It is a structure of the sliding sleeve of the application Figure I ;

[0036] Figure 5 It is a structure of the sliding sleeve of the application Figure II ;

[0037] Figure 6 It is an example diagram of the connection relationship between the driving shaft and the driving wheel of the application.

[0038] Wherein, 1 - carrier, 2 - crank, 3 - car chassis, 4 - rocker, 5 - seat, 501 - seat local, 6 - drive wheel, 7 - transmission mechanism, 71 - driving wheel, 72 - driven wheel, 73 - transmission member, 74 - idler frame, 8 - drive shaft, 9 - crankshaft, 10 - buffer spring, 11 - sliding sleeve, 111 - guide groove I, 112 - guide groove II, 12 - guide block, 13 - guide boss. DETAILED DESCRIPTION

[0039] The application will be described in detail below with reference to the drawings and examples.

[0040] Example 1

[0041] This embodiment provides a multifunctional child stroller, referring to the drawings Figure 1 and 2 , including crankshaft 9, car chassis 3, crank 2, carrier 1 and rocker 4;

[0042] Crankshaft 9 is rotatably arranged on car chassis 3, and crankshaft 9 can rotate when pushing the stroller, one end of crank 2 is fixedly connected with crankshaft 9, and the other end is pinned with carrier 1; the bottom end of rocker 4 is pinned with car chassis 3, and the top end is pinned with carrier 1;

[0043] Carrier 1 is provided with seat 5; crankshaft 9 is located below seat 5;

[0044] When the pinning axis line of crank 2 is the highest, the vertical distance H between the top pinning axis line and the bottom pinning axis line of rocker 4 is greater than or equal to the eccentricity of crank 2;

[0045] The eccentricity of crank 2 ranges from 20mm to 60mm, and the maximum pitch angle θ of the seat surface of seat 5 ranges from 0° to 30°.

[0046] The multifunctional child stroller provided in this embodiment has the eccentricity of crank 2 ranging from 20mm to 60mm and the maximum pitch angle θ ranging from 0° to 30°, which ensures that the movement amplitude of the stroller is moderate and prevents excessive swinging, can produce obvious undulating feeling and enhance interest, and will not be too violent, thus ensuring the safety and comfort of infants and young children.

[0047] It should be noted that the maximum pitch angle θ of the seat surface of seat 5 is the included angle between the limit position of the seat surface when the stroller is rocked and the limit position of the seat surface when the stroller is rocked;

[0048] Let the horizontal plane where the top pinning axis line of rocker 4 is located be horizontal plane I, and the horizontal plane where the bottom pinning axis line of rocker is located be horizontal plane II, and the distance between horizontal plane I and horizontal plane II is the aforementioned vertical distance H.

[0049] The eccentricity is the distance between the pin connection axis of the crank 2 and the carrier 1 and the axis of the crank shaft 9;

[0050] Attachment Figure 3 The horizontal line above the carrier 1 represents not the simplified entire seat 5, but rather a seat portion 501. The horizontal distance D between the bottom pinned axis of the rocker 4 and the axis of the crankshaft 9 ranges from 200 mm to 400 mm, and the vertical distance H between the top pinned axis and the bottom pinned axis of the rocker 4 ranges from 20 mm to 340 mm. By determining D and H within these ranges, the geometric constraints formed between the crankshaft 9, the underframe 3, the rocker 4, and the carrier 1 are quantified.

[0051] The eccentricity of crank 2 is 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm or 60mm;

[0052] In a specific embodiment, the eccentricity of the crank 2 is 20 mm, the horizontal distance D is 400 mm, the projected length H is 20 mm, and the maximum pitch angle θ of the seat surface is 0°;

[0053] In another specific embodiment, the eccentricity of the crank 2 is 20 mm, the horizontal distance D is 400 mm, the projected length H is 300 mm, and the maximum pitch angle θ of the sitting surface is 5.7°;

[0054] In another specific embodiment, the eccentricity of the crank 2 is 20 mm, the horizontal distance D is 200 mm, the projected length H is 168 mm, and the maximum pitch angle θ of the seat surface is 11.3°;

[0055] In another specific embodiment, the eccentricity of the crank 2 is 30 mm, the horizontal distance D is 400 mm, the projected length H is 310 mm, and the maximum pitch angle θ of the sitting surface is 8.7°;

[0056] In another specific embodiment, the eccentricity of the crank 2 is 30 mm, the horizontal distance D is 386 mm, the projected length H is 320 mm, and the maximum pitch angle θ of the seat surface is 8.8°;

[0057] In another specific embodiment, the eccentricity of the crank 2 is 30 mm, the horizontal distance D is 294 mm, the projected length H is 204 mm, and the maximum pitch angle θ of the seat surface is 11.6°;

[0058] In another specific embodiment, the eccentricity of the crank 2 is 30 mm, the horizontal distance D is 200 mm, the projected length H is 120 mm, and the maximum pitch angle θ of the sitting surface is 17°;

[0059] In another specific embodiment, the eccentricity of the crank 2 is 50 mm, the horizontal distance D is 400 mm, the projected length H is 330 mm, and the maximum pitch angle θ of the sitting surface is 14.5°;

[0060] In another specific embodiment, the eccentricity of the crank 2 is 50 mm, the horizontal distance D is 230 mm, the projected length H is 120 mm, and the maximum pitch angle θ of the sitting surface is 25°;

[0061] In another specific embodiment, the eccentricity of the crank 2 is 50 mm, the horizontal distance D is 200 mm, the projected length H is 198 mm, and the maximum pitch angle θ of the sitting surface is 30°;

[0062] In another specific embodiment, the eccentricity of the crank 2 is 60 mm, the horizontal distance D is 400 mm, the projected length H is 340 mm, and the maximum pitch angle θ of the sitting surface is 17.5°;

[0063] In another specific embodiment, the eccentricity of the crank 2 is 60 mm, the horizontal distance D is 350 mm, the projected length H is 140 mm, and the maximum pitch angle θ of the seat is 20°.

[0064] In another specific embodiment, the eccentricity of the crank 2 is 60 mm, the horizontal distance D is 280 mm, the projected length H is 132 mm, and the maximum pitch angle θ of the seat is 25°.

[0065] In another specific embodiment, the eccentricity of the crank 2 is 60 mm, the horizontal distance D is 230 mm, the projected length H is 132 mm, and the maximum pitch angle θ of the seat is 30°.

[0066] Pin holes are provided on both sides of the front of the vehicle chassis 3, and the lower end of the rocker 4 is matched with the pin hole through a pin shaft to realize the pin connection between the lower end of the rocker 4 and the vehicle chassis 3; an upper lug is provided on the carrier 1, and the upper end of the rocker 4 is pinned to the upper lug.

[0067] The crank 2 can be a rod crank, a fan crank or a circular crank;

[0068] When the pin-connected axis of the crank 2 is at the highest, the rocker 4 can be arranged tilted or vertically; the rocker 4 can be a straight rod, a curved rod or a special-shaped rod.

[0069] A buffer spring 10 is provided between the supporting body 1 and the vehicle underframe 3 to buffer the descent of the supporting body 1 .

[0070] The seat may be provided with guardrails and backrests to ensure the safety of children.

[0071] Working principle:

[0072] Based on the child growth standard of the World Health Organization (WHO), the standard height of a boy at 1 year old is 76.0-81.0 cm, and the standard height of a girl is 74.0-80.0 cm; the standard height of a boy at 3 years old is 90.5-102.5 cm, and the standard height of a girl is 89.5-101.0 cm; the standard height of a boy at 5 years old is 105.0-114.5 cm, and the standard height of a girl is 104.5-113.5 cm. Based on the above data, the height of the seat of the stroller should not be too high and should be adapted to the height of the child, so that when the pin connecting shaft of the crank 2 is at the highest point, the distance between the highest point of the seat surface on the seat 5 and the ground is in the range of 370-420 mm. Since the crank shaft is located below the seat, the size of the crank needs to be designed based on the data so that the crank does not interfere with the ground and other components when rotating.

[0073] Under the above constraints, the length of the crank 2 mainly determines the vertical fluctuation amplitude and the swing amplitude (i.e., the pitch angle) of the carrier 1, and the horizontal distance D between the bottom pin shaft of the rocker 4 and the crank shaft 9 mainly controls the swing amplitude. In the present application, whether the eccentric distance = 60 mm and the horizontal distance D = 230 mm, or the eccentric distance = 50 mm and the horizontal distance D = 200 mm, or e = 20 mm and the distance D = 400 mm, the stroller can realize fluctuation and swing within a safe and reasonable range, increasing the interest of children riding.

[0074] Embodiment 2:

[0075] This embodiment is based on Embodiment 1, and the multifunctional child stroller further comprises a push handle, a drive wheel 6, a drive shaft 8, and a transmission mechanism 7.

[0076] The drive shaft 8 is rotatably arranged on the vehicle chassis 3, the drive wheel 6 is a rear wheel of the stroller, and the drive wheel 6 is coaxially connected with the drive shaft 8; the drive shaft 8 drives the crank shaft 9 and the crank 2 to rotate through the transmission mechanism 7; the transmission mechanism 7 comprises a driving wheel 71, a driven wheel 72, and a transmission member 73.

[0077] The push handle is fixedly connected to the rear end of the vehicle chassis 3.

[0078] In addition, the crank shaft can also be driven to rotate by a motor and a reduction gear, etc.

[0079] Embodiment 3:

[0080] This embodiment is based on Embodiment 2, and the stroller is shown in FIG. 4. Figure 3 The driving wheel 71 is a driving gear, the driven wheel 72 is a driven gear 72, and the transmission member 73 is an idler gear.

[0081] The driving gear is arranged on the driving shaft 8 through a long key, and the driving gear is movable along the axial direction of the driving shaft 8; the driven gear 72 is arranged on the crank shaft 9, and the driving gear and the driven gear 72 are engaged through the idle gear;

[0082] The driving shaft 8 is externally sleeved with an idle gear frame 74, and the idle gear is rotationally arranged on the idle gear frame 74; specifically, the idle gear is pinned to the idle gear frame 74.

[0083] The idle gear frame 74 is rotatable along the driving shaft 8 and / or movable along the axial direction of the driving shaft 8, when the walking mode of the trolley is converted, the idle gear frame 74 is pulled or moved, so that the idle gear is engaged with or disengaged from the driven gear 72;

[0084] Further, a plurality of driven gears 72 of different specifications can be arranged on the crank shaft 9, by moving and rotating the idle gear frame 74, the driving gear is synchronously moved, so that the idle gear is engaged with the driven gears 72 of different specifications, and the transmission ratio is changed.

[0085] Embodiment 4:

[0086] This embodiment is based on embodiment 2, referring to the accompanying drawings Figure 1 and 4 The driving shaft 8 is coaxially provided with a sliding sleeve 11; the driving shaft 8 is fixedly provided with a guide block 12, the inner circumference of the sliding sleeve 11 is provided with a guide groove I 111, and the guide block 12 is located in the guide groove I 111, so that the sliding sleeve 11 can slide along the driving shaft 8;

[0087] The driving wheel 71 is rotationally connected with the driving shaft 8 (that is, the driving wheel 71 can rotate relative to the driving shaft 8, and can be connected through a bearing); the driving wheel 71 is provided with a plurality of circumferentially distributed guide bosses 13 at one end facing the sliding sleeve 11, and the sliding sleeve 11 is provided with a plurality of circumferentially distributed guide grooves II 112 at one end facing the driving wheel 71, the length directions of the guide bosses 13 and the guide grooves II 112 are both along the axial direction, and the guide bosses 13 can be correspondingly matched with the guide grooves II 112;

[0088] The driven wheel 72 is coaxially and fixedly arranged on the crank shaft 9, and the driving wheel 71 and the driven wheel 72 are driven through the transmission member 73;

[0089] The sliding sleeve 11 is pulled away from or combined with the driving wheel 71, so as to control whether the driving wheel 71 rotates synchronously with the driving shaft 8, thereby realizing the switching between the rocking mode and the flat walking mode. Further, a pull rod can be arranged to pull the sliding sleeve 11.

[0090] Further, a plurality of guide grooves II 112 are arranged on the inner circumference of the sliding sleeve 11, and the guide bosses 13 are arranged on the outer circumference of the one end of the driving wheel 71 facing the sliding sleeve 11;

[0091] Further, the driving wheel 71 is a driving pulley, the driven wheel 72 is a driven pulley, and the transmission mechanism 7 is a belt, the outer diameter of the driving pulley is smaller than that of the driven pulley.

[0092] Alternatively, the driving wheel 71 is a driving gear, the driven wheel 72 is a driven gear, and the transmission mechanism 7 is an idler gear frame 74 and an idler gear, the outer diameter of the driving gear is smaller than that of the driven gear.

[0093] Alternatively, the driving wheel 71 is a driving sprocket, the driven wheel 72 is a driven sprocket, and the transmission mechanism 7 is a chain, the outer diameter of the driving sprocket is smaller than that of the driven sprocket.

[0094] Embodiment 5:

[0095] This embodiment is based on Embodiment 2, and the driving wheel 6 is provided with a clutch mechanism which controls the synchronous rotation or disengagement of the driving wheel 6 and the driving shaft 8. The clutch mechanism can adopt the structure disclosed in Patent 200810062430.0.

[0096] In conclusion, the above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-functional child stroller, characterized in that, The crank shaft is rotatably arranged on the vehicle chassis, one end of the crank is fixedly connected with the crank shaft, and the other end is pivotally connected with the carrier; the bottom end of the rocker is pivotally connected with the vehicle chassis, and the top end is pivotally connected with the carrier. The carrier is provided with a seat, and the crank shaft is located below the seat. When the pivot axis of the crank is at the highest position, the vertical distance H between the pivot axis of the top of the rocker and the pivot axis of the bottom of the rocker is greater than or equal to the eccentricity of the crank. The eccentricity of the crank ranges from 20mm to 60mm, and the maximum pitch angle θ of the seat surface ranges from 0° to 30°. The horizontal distance D between the pivot axis of the bottom of the rocker and the axis of the crank shaft ranges from 200mm to 400mm.

2. The multi-functional child stroller of claim 1, wherein, The projection length H of the distance between the pivot axis of the top of the rocker and the pivot axis of the bottom of the rocker in the vertical direction ranges from 20mm to 340mm.

3. The multi-functional child's vehicle as claimed in claim 1 or 2, wherein, A buffer spring is arranged between the carrier and the vehicle chassis.

4. The multi-functional child carrier as claimed in claim 1 or 2, wherein, The driving wheel, the driving shaft and the transmission mechanism are also included.

5. A multifunctional stroller for children as claimed in claim 1 or 2, characterized in that: The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism.

6. The multi-functional child's vehicle of claim 5, wherein, The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism.

7. The multi-functional child stroller of claim 5, wherein, The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism.

8. The multi-functional child stroller of claim 5, wherein, The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a rear wheel of the rocking car, and the driving wheel is coaxially connected with the driving shaft; the driving shaft drives the crank shaft and the crank to rotate through the transmission mechanism. The driving shaft is rotatably arranged on the vehicle chassis, the driving wheel is a

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