A structure for adjusting the distance between front and rear wheels and a child vehicle

Abstract

The utility model belongs to the field of children's car, provide a kind of adjusting structure and children's car for front and rear wheel spacing, including adjusting structure including unlocking block and stop piece, wherein: unlocking block is movably connected in rear wheel assembly, one end of unlocking block is connected to stop piece, and the other end is movably extended to rear wheel assembly outside;Stop piece has the stop block that can be switched between the unlocking position and locking position of vehicle-mounted frame, and the stop block is used to limit the spacing between rear wheel assembly and front wheel assembly.Compared with prior art, the utility model has the advantages that by setting exposed unlocking block on rear wheel assembly, user only needs to squeeze the unlocking block with single hand to realize locking and unlocking action, response is quick and does not need additional tool or complex operation, significantly improves adjusting efficiency and user experience, while cooperating with the elastic reset force under the action of driving stop block automatic insertion vehicle-mounted frame, realize automatic locking positioning, ensure the safety and reliability when vehicle is used.

Description

Technical Field

[0001] This utility model belongs to the field of children's vehicles, specifically relating to an adjustment structure for the distance between the front and rear wheels and a children's vehicle. Background Technology

[0002] A stroller is a tool vehicle specifically designed to provide convenience for children's outdoor activities and play. With the improvement of living standards, strollers have become an essential item for taking care of children.

[0003] In existing technologies, some vehicles use multiple mounting holes on the frame and bolts or pins to fix the rear wheel assembly in different positions to adjust the front and rear wheel clearance. However, this adjustment process often requires the use of wrenches or Allen wrenches, making it cumbersome and preventing quick switching. Frequent disassembly and assembly can also lead to thread wear or pin loss, affecting long-term reliability. Furthermore, since the tightening force relies on manual application, there is a risk of inadequate tightening or overtightening, which could damage components, posing a significant safety hazard. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a simple, stable, and agile adjustment structure for front and rear wheel spacing, as well as a children's stroller, which improves vehicle stability and maneuverability.

[0005] The objective of this utility model can be achieved by addressing the following technical problem: a structure for adjusting the distance between front and rear wheels is proposed, used to adjust the distance between the rear wheel assembly and the front wheel assembly. A vehicle frame connects the rear wheel assembly and the front wheel assembly, and the rear wheel assembly is movably connected to the vehicle frame. The adjustment structure includes an unlocking block and a stop, wherein:

[0006] The unlocking block is movably connected within the rear wheel assembly, with one end of the unlocking block connected to the stop and the other end movably extending outside the rear wheel assembly;

[0007] The stop has a stop block that can be switched between an unlocked position and a locked position on the vehicle frame, the stop block being used to limit the distance between the rear wheel assembly and the front wheel assembly;

[0008] When the stop block is in the locked position, the stop block is movably inserted into the vehicle frame;

[0009] When the unlocking block is squeezed, the stop block disengages from the vehicle frame and retracts into the rear wheel assembly along with the unlocking block, allowing the rear wheel assembly to slide relative to the vehicle frame to adjust the distance between it and the front wheel assembly.

[0010] In the aforementioned structure for adjusting the distance between the front and rear wheels, the rear wheel assembly includes a rear wheel frame and a mounting frame. The rear wheel frame is provided with a connecting sleeve, which is movably fitted onto the vehicle frame. The mounting frame is detachably connected to the outer wall of the connecting sleeve and forms a mounting cavity with the rear wheel frame. The unlocking block and the stop are both located within the mounting cavity.

[0011] In the aforementioned structure for adjusting the distance between the front and rear wheels, the top wall of the stop block has a guide arc surface, and the side wall has an avoidance arc surface connected to the guide arc surface. The vehicle frame has a plurality of locking holes along its length direction, and the guide arc surface is used to guide the stop block into the locking holes.

[0012] In the aforementioned structure for adjusting the distance between the front and rear wheels, the stop further includes a drive block and an elastic element. The unlocking block is connected to the drive block, and the stop block is disposed on the drive block. A connecting seat is formed on the mounting frame, and one end of the elastic element is connected to the bottom wall of the drive block, and the other end is connected to the connecting seat.

[0013] In the aforementioned structure for adjusting the distance between the front and rear wheels, the drive block has an interconnected mounting groove and a through hole, the stop block has a connecting part, the connecting part has a connecting hole, and the connecting hole can be coaxially arranged with the through hole and interconnected when the connecting part extends into the mounting groove.

[0014] In the aforementioned structure for adjusting the distance between the front and rear wheels, an extension arm is also formed on the unlocking block, the drive block is integrally formed with the extension arm, and connecting shafts are formed on both sides of the extension arm. A connecting groove is provided in the rear wheel frame, and the connecting shaft is movably disposed in the connecting groove.

[0015] In the aforementioned adjustment structure for the distance between the front and rear wheels, the distance between the unlocking block and the center line of the connecting shaft is greater than the distance between the stop block and the center line of the connecting shaft.

[0016] In the aforementioned structure for adjusting the distance between the front and rear wheels, the mounting frame has a through groove and a limiting groove that are interconnected. The side wall of the unlocking block extends outward to form a limiting block. The limiting block is movably engaged with the limiting groove, so that the unlocking block passes through the through groove and extends outside the mounting frame.

[0017] In the aforementioned adjustment structure for the distance between the front and rear wheels, the side of the unlocking block opposite to the stop block also forms an anti-detachment arc surface, which movably abuts against the inner wall of the mounting frame.

[0018] The technical solution adopted by this utility model to solve its technical problem is to also propose a children's vehicle, including one of the above-mentioned adjustment structures for the distance between the front and rear wheels.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) This utility model provides an adjustment structure for the distance between the front and rear wheels and a children's vehicle. By setting an exposed unlocking block on the rear wheel assembly, the user only needs to squeeze the unlocking block with one hand to achieve locking and unlocking actions. The response is fast and no additional tools or complicated operations are required, which significantly improves the adjustment efficiency and user experience. At the same time, under the action of elastic restoring force, the stop block is automatically inserted into the vehicle frame to achieve automatic locking and positioning, ensuring the safety and reliability of the vehicle during use.

[0021] (2) The guide arc surface can automatically guide the stop block to align with the locking hole, avoiding jamming of the rear wheel assembly during position switching; while the avoidance arc surface provides sufficient transition space for the stop block, reducing collision resistance, improving the smoothness of insertion, and improving the reliability and operation feel of the locking action.

[0022] (3) By locking the limiting block into the limiting groove, the unlocking block is precisely guided during the movement process; in addition, the anti-detachment arc surface abuts against the inner wall of the mounting frame, which can play the anti-detachment limiting function when the unlocking block extends to the outside of the mounting frame, avoiding local stress concentration and jamming. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the application when it is used in a children's stroller;

[0024] Figure 2 This is a schematic diagram of the installation structure between the rear wheel assembly, the unlocking block, and the stop.

[0025] Figure 3 This is a schematic diagram of the installation structure of the unlocking block and the stop component on the mounting frame;

[0026] Figure 4 This is a schematic diagram of the installation structure between the unlocking block and the limiting block;

[0027] Figure 5 This is a schematic diagram of the installation structure between the connecting shaft and the connecting groove.

[0028] In the diagram, 1 is the front wheel assembly; 10 is the vehicle mounting frame; 100 is the locking hole; and 101 is the guide groove.

[0029] 2. Rear wheel assembly; 20. Rear wheel bracket; 200. Connecting sleeve; 200a. Clamping block; 201. Connecting groove; 21. Mounting frame; 210. Mounting cavity; 211. Connecting seat; 212. Through groove; 213. Limiting groove;

[0030] 3. Unlocking block; 30. Extension arm; 300. Connecting shaft; 31. Limiting block; 32. Anti-detachment arc surface;

[0031] 4. Stopping element; 40. Stopping block; 400. Guide arc surface; 401. Avoidance arc surface; 402. Connecting part; 402a. Connecting hole; 41. Driving block; 410. Mounting groove; 411. Through hole; 42. Elastic element. Detailed Implementation

[0032] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0034] like Figure 1 As shown, this solution mainly describes in detail an adjustment structure for the front and rear wheel spacing used in children's vehicles. However, this adjustment structure for the front and rear wheel spacing is not limited to use in children's vehicles, but can also be applied to vehicles that adjust the front and rear wheel spacing.

[0035] like Figures 1 to 5 As shown, an adjustment structure for the front and rear wheel spacing is used to adjust the spacing between the rear wheel assembly 2 and the front wheel assembly 1. A vehicle frame 10 is connected between the rear wheel assembly 2 and the front wheel assembly 1. The rear wheel assembly 2 is movably connected to the vehicle frame 10. The adjustment structure includes an unlocking block 3 and a stop 4.

[0036] The unlocking block 3 is movably connected inside the rear wheel assembly 2. One end of the unlocking block 3 is connected to the stop 4, and the other end extends movably outside the rear wheel assembly 2. The stop 4 has a stop block 40 that can be switched between the unlocked position and the locked position of the vehicle frame 10. The stop block 40 is used to limit the distance between the rear wheel assembly 2 and the front wheel assembly 1. When the stop block 40 is in the locked position, the stop block 40 is movably inserted into the vehicle frame 10. When the unlocking block 3 is squeezed, the stop block 40 disengages from the vehicle frame 10 and retracts into the rear wheel assembly 2 along with the unlocking block 3, so that the rear wheel assembly 2 can slide relative to the vehicle frame 10 to adjust the distance between it and the front wheel assembly 1.

[0037] This embodiment optimizes steering response and stability by adjusting the wheel spacing (front wheel assembly 1 and rear wheel assembly 2) to suit children of different ages. Specifically, during normal vehicle use or after wheel spacing adjustment, the stop block 40 is in a locked state, such as... Figure 2 As shown, at this time, the top of the stop block 40 is firmly inserted into the vehicle frame 10, forming a mechanical limiting structure, effectively preventing the rear wheel assembly 2 from sliding relative to the rear wheel assembly 2 along the length of the vehicle frame 10, thereby fixing the distance between the front and rear wheel assemblies 2; at the same time, the unlocking block 3 is in a naturally extended state when not subjected to external force (i.e., part of its structure is exposed outside the rear wheel assembly 2), making it easy for the user to identify and operate. As the user squeezes the unlocking block 3 to move it into the rear wheel assembly 2, the pressure is directly transmitted through the unlocking block 3 to the stop block 40 linked to it, causing the stop block 40 to retract synchronously into the rear wheel assembly 2, releasing the vehicle frame 10 from limiting the rear wheel assembly 2. At this time, the user can adjust the distance between the rear wheel assembly 2 and the front wheel assembly 1 according to actual usage needs. After the position adjustment is completed, as the user no longer applies pressure to the unlocking block 3, the stop block 40 is precisely reinserted into the vehicle frame 10, completing the locking function of the rear wheel assembly 2 again. At the same time, the unlocking block 3 also extends out of the rear wheel assembly 2 for normal use in the next distance adjustment operation. As can be seen, by setting an exposed unlocking block 3 on the rear wheel assembly 2, the user only needs to squeeze the unlocking block 3 with one hand to realize the locking and unlocking action. The response is fast and no additional tools or complicated operations are required, which significantly improves the adjustment efficiency and user experience. At the same time, the automatic locking and positioning function ensures the safety and reliability of the vehicle during use.

[0038] The rear wheel assembly 2 includes a rear wheel frame 20 and a mounting frame 21. The rear wheel frame 20 is provided with a connecting sleeve 200, which is movably fitted onto the vehicle frame 10. The mounting frame 21 is detachably connected to the outer wall of the connecting sleeve 200 and forms a mounting cavity 210 with the rear wheel frame 20. The unlocking block 3 and the stop 4 are both provided in the mounting cavity 210.

[0039] like Figure 2 and Figure 5 As shown, in this embodiment, the rear wheel frame 20 and the connecting sleeve 200 are integrally molded, eliminating assembly steps and reducing manufacturing costs. The smoothness and stability of adjusting the distance between the front and rear wheel assemblies 2 are ensured by the cooperation between the connecting sleeve 200 and the vehicle frame 10. Furthermore, in this embodiment, the mounting frame 21 can be connected to the outer wall of the connecting sleeve 200 using screws and other components, enabling the overall assembly or maintenance of the unlocking block 3 and the stop 4, improving production assembly efficiency and ease of later maintenance. Simultaneously, the mounting cavity 210 provides a good protective environment for key components, preventing external dust and foreign objects from entering and affecting the mechanism's operation, enhancing the structure's durability and stability, and extending its service life. It should be noted that the other structures of the rear wheel assembly 2 and the overall structure of the front wheel assembly 1 in this embodiment are the same as in the prior art, and will not be described in detail here.

[0040] The stop 4 also includes a drive block 41 and an elastic element 42. The unlocking block 3 is connected to the drive block 41, and the stop block 40 is disposed on the drive block 41. A connecting seat 211 is formed on the mounting frame 21. One end of the elastic element 42 is connected to the bottom wall of the drive block 41, and the other end is connected to the connecting seat 211.

[0041] like Figure 2 and Figure 3 As shown, when the user applies a squeezing force from the unlocking block 3 onto the mounting cavity 210, this pressure is directly transmitted to the driving block 41 through the unlocking block 3, and the driving block 41 moves along its vertical direction... Figure 2 As the elastic element 42 is gradually compressed, the stop block 40 disengages from the vehicle frame 10, unlocking the device. At this point, the user can freely slide the rear wheel assembly 2 along the length of the vehicle frame 10 to adjust the wheelbase between the front and rear wheel assemblies 2. After the external force on the unlocking block 3 is released, the restoring force provided by the elastic element 42 automatically pushes the stop block 40 back to the locked position, i.e., re-insertes it into the vehicle frame 10. This achieves a convenient press-to-unlock and release-to-lock operation mode, eliminating the need for manual reset, simplifying the user's operation process, improving adjustment efficiency, and ensuring the reliability of the locked state, preventing accidental unlocking.

[0042] The top wall of the stop block 40 has a guide arc surface 400, and the side wall has a clearance arc surface 401 connected to the guide arc surface 400. The vehicle frame 10 has a plurality of locking holes 100 along its length direction. The guide arc surface 400 is used to guide the stop block 40 into the locking hole 100.

[0043] like Figure 2 As shown, there are three locking holes 100 in this embodiment. However, this number is not limited to this embodiment and can be adjusted during manufacturing to meet actual usage requirements. Because of this, the user does not need to precisely align the locking holes 100; they only need to roughly slide them to the target area. The stop block 40 will automatically slide into the locking hole 100 under the action of the guide arc surface 400, achieving self-guiding positioning and seamless locking. This effectively avoids the jamming phenomenon that occurs during repeated adjustments in traditional structures, significantly improving the smoothness and accuracy of the adjustment process. The avoidance arc surface 401 provides sufficient transition space for the stop block 40, reducing collision resistance, improving insertion smoothness, and enhancing the reliability and feel of the locking action.

[0044] Preferably, in this embodiment, locking blocks 200a are symmetrically formed on the inner wall of the connecting sleeve 200, and a guide groove 101 is formed in the length direction of the vehicle frame 10 (i.e., the direction of movement of the rear wheel assembly 2 relative to the vehicle frame 10). The two locking blocks 200a are respectively moved and pressed against the two side walls of the guide groove 101, thereby providing guidance and limiting functions for the movement of the rear wheel assembly 2 relative to the vehicle frame 10. This prevents the connecting sleeve 200 from rotating relative to the vehicle frame 10 and affecting the normal use of the vehicle. At the same time, it also ensures that after the distance between the front and rear wheel assemblies 2 is adjusted, the restoring force of the elastic element 42 can push the stop block 40 to be accurately inserted into the corresponding locking hole 100, preventing positional deviation during the locking process and causing jamming.

[0045] The drive block 41 has an interconnected mounting groove 410 and a through hole 411. The stop block 40 has a connecting part 402. The connecting part 402 has a connecting hole 402a. When the connecting part 402 extends into the mounting groove 410, the connecting hole 402a is coaxially arranged with the through hole 411 and interconnected with it.

[0046] like Figure 3 As shown, in this embodiment, the stop block 40 and the drive block 41 are connected by a detachable installation method. Specifically, when the connecting part 402 of the stop block 40 aligns with the mounting groove 410 of the drive block 41 and slides into the mounting groove 410, the connecting hole 402a on the connecting part 402 and the through hole 411 on the drive block 41 are coaxially aligned, which facilitates a stable connection between the two by fasteners such as pins or screws. This structure facilitates timely disassembly and replacement of the stop block 40 when wear or damage occurs. On the other hand, it can effectively transmit the unlocking force of the unlocking block 3 and the restoring force of the elastic element 42, ensuring the synchronicity and reliability of the stop block 40's action. Moreover, the overall structure is relatively compact and suitable for compact mounting cavities 210, improving integration.

[0047] An extension arm 30 is also formed on the unlocking block 3. The drive block 41 is integrally formed with the extension arm 30, and a connecting shaft 300 is formed on both sides of the extension arm 30. A connecting groove 201 is opened in the rear wheel frame 20, and the connecting shaft 300 is movably disposed in the connecting groove 201.

[0048] like Figure 3 and Figure 5As shown, in this embodiment, the connecting shaft 300 is movably embedded in the connecting groove 201 within the rear wheel frame 20, forming a stable rotation fulcrum structure. This allows the unlocking block 3 to rotate relative to the rear wheel frame 20 around the connecting shaft 300 when pressed, thereby efficiently transmitting the force to the drive block 41 and ensuring that the stop block 40 smoothly disengages from the locking hole 100. The one-piece molding structure helps enhance the overall strength of the components, reduces assembly steps, and lowers the failure rate. Simultaneously, the limiting effect of the connecting groove 201 on the connecting shaft 300 prevents the unlocking block 3 from shifting or falling off during movement, improving operational stability.

[0049] Preferably, in this embodiment, the distance between the unlocking block 3 and the axis of the connecting shaft 300 is greater than the distance between the stop block 40 and the axis of the connecting shaft 300, forming a lever-type lever arm structure. When the user presses the unlocking block 3, due to the longer lever arm, a force-saving effect can be achieved, that is, a smaller pressing force can generate a larger release force at the end of the stop block 40, overcoming the elastic force of the elastic element 42 and the frictional resistance, and completing the unlocking action. This design optimizes the operating feel, and is especially suitable for children or users with less strength to operate, significantly improving the user experience.

[0050] The mounting frame 21 has a through groove 212 and a limiting groove 213 that are interconnected. The side wall of the unlocking block 3 extends outward to form a limiting block 31. The limiting block 31 is movably engaged with the limiting groove 213, so that the unlocking block 3 passes through the through groove 212 and extends out of the mounting frame 21.

[0051] like Figure 4 As shown, in this embodiment, a limiting block 31 is provided on the side wall of the unlocking block 3, and it is movably engaged in the limiting groove 213 on the mounting frame 21. This, together with the through groove 212, achieves a dual limiting function for the unlocking block 3. Specifically, by engaging the limiting block 31 in the limiting groove 213, the unlocking block 3 achieves precise guidance during its movement. Furthermore, the anti-detachment arc surface 32 abuts against the inner wall of the mounting frame 21, providing anti-detachment and limiting function when the unlocking block 3 extends beyond the mounting frame 21, preventing local stress concentration and jamming. Therefore, this structure effectively constrains the movement trajectory of the unlocking block 3, preventing it from rotating or shifting laterally during pressing, ensuring accurate force transmission.

[0052] The side of the unlocking block 3 away from the stop block 40 also has an anti-detachment arc surface 32, which moves against the inner wall of the mounting frame 21.

[0053] Continue to refer to Figure 4As shown in the embodiment, an anti-detachment arc surface 32 is provided on the side of the unlocking block 3 away from the stop block 40, and it abuts against the inner wall of the mounting frame 21. This structure can provide a uniform distribution of support force when the unlocking block 3 is pressed and moved, reduce local stress concentration, and prevent the unlocking block 3 from jamming or breaking due to uneven force. At the same time, the arc surface structure reduces the sliding friction resistance, making the operation smoother, and can effectively prevent the unlocking block 3 from excessively popping out when the elastic element 42 rebounds, which would cause it to detach or make abnormal noise, thus improving the quietness and durability of the structure.

[0054] It should be noted that the elastic element 42 in this embodiment can be replaced by other elastic devices such as compression springs or return springs.

[0055] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0057] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A structure for adjusting the distance between front and rear wheels, used to adjust the distance between a rear wheel assembly and a front wheel assembly, wherein a vehicle frame is connected between the rear wheel assembly and the front wheel assembly, and the rear wheel assembly is movably connected to the vehicle frame, characterized in that, The adjustment structure includes an unlocking block and a stop, wherein: The unlocking block is movably connected within the rear wheel assembly, with one end of the unlocking block connected to the stop and the other end movably extending outside the rear wheel assembly; The stop has a stop block that can be switched between an unlocked position and a locked position on the vehicle frame, the stop block being used to limit the distance between the rear wheel assembly and the front wheel assembly; When the stop block is in the locked position, the stop block is movably inserted into the vehicle frame; When the unlocking block is squeezed, the stop block disengages from the vehicle frame and retracts into the rear wheel assembly along with the unlocking block, allowing the rear wheel assembly to slide relative to the vehicle frame to adjust the distance between it and the front wheel assembly.

2. The structure for adjusting the distance between front and rear wheels according to claim 1, wherein The rear wheel assembly includes a rear wheel frame and a mounting frame. The rear wheel frame is provided with a connecting sleeve, which is movably fitted onto the vehicle frame. The mounting frame is detachably connected to the outer wall of the connecting sleeve and forms a mounting cavity with the rear wheel frame. The unlocking block and the stop are both located within the mounting cavity.

3. The adjustment structure for the distance between front and rear wheels according to claim 1, characterized in that, The top wall of the stop block has a guide arc surface, and the side wall has a clearance arc surface connected to the guide arc surface. The vehicle frame has a plurality of locking holes along its length direction. The guide arc surface is used to guide the stop block into the locking holes.

4. The structure for adjusting the distance between front and rear wheels according to claim 2, wherein The stop also includes a drive block and an elastic element. The unlocking block is connected to the drive block, and the stop block is disposed on the drive block. A connecting seat is formed on the mounting frame. One end of the elastic element is connected to the bottom wall of the drive block, and the other end is connected to the connecting seat.

5. The adjustment structure for the front and rear wheel distance according to claim 4, characterized in that, The drive block has an interconnected mounting groove and a through hole. The stop block has a connecting part with a connecting hole. When the connecting part extends into the mounting groove, the connecting hole is coaxially arranged with the through hole and interconnected with it.

6. The adjustment structure for the front and rear wheel distance according to claim 4, wherein An extension arm is also formed on the unlocking block. The drive block is integrally formed with the extension arm, and connecting shafts are formed on both sides of the extension arm. A connecting groove is provided in the rear wheel frame, and the connecting shaft is movably disposed in the connecting groove.

7. The structure for adjusting the distance between front and rear wheels according to claim 6, wherein The distance between the unlocking block and the center line of the connecting shaft is greater than the distance between the stop block and the center line of the connecting shaft.

8. The adjustment structure for the front and rear wheel distance according to claim 2, wherein The mounting frame has interconnected through slots and limiting slots. The sidewall of the unlocking block extends outward to form a limiting block. The limiting block is movably engaged with the limiting slot, so that the unlocking block passes through the through slot and extends outside the mounting frame.

9. The adjustment structure for the front and rear wheel distance according to claim 2, wherein The side of the unlocking block opposite to the stop block also has an anti-detachment arc surface, which moves against the inner wall of the mounting frame.

10. A child's vehicle characterised by The invention includes an adjustment structure for the distance between the front and rear wheels as described in any one of claims 1-9.

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