CN110816633A - Children's barrow - Google Patents

Abstract

A children's stroller includes a bottom frame, an upper frame structure formed above the bottom frame, the bottom frame includes a bottom base frame, a rear wheel support rod that can only be rotatably connected to the bottom base frame around a bottom extending front and rear , Only the front wheel support rod can be arranged on the rear wheel support rod in a straight line sliding forward and backward. The front wheel assembly is arranged at the front of the front wheel support rod, and the rear wheel assembly is arranged at the rear of the rear wheel support rod. The front wheel support rod and the rear wheel support rod are shortened front and rear, which is also the front and rear shortening between the front wheel support rod, the rear wheel support rod and the base frame. Under the cooperation of the sliding synchronization mechanism, the front wheel support rod is promoted. It rotates relative to the base frame in synchronization with the rear wheel support rod, so that the front and rear wheel assemblies that were standing before not only shorten the front and rear distances, but also the front and rear wheel assemblies on the left and right sides are rotated and folded toward each other. The folded volume is more compact and flatter.

Description

stroller

technical field

The present invention relates to a children's stroller.

Background technique

Children's strollers in the prior art generally include a stroller frame having an unfolded position and a folded position, a seat mechanism disposed on the stroller frame, and a mechanism for locking the stroller frame in the unfolded position. The whole vehicle locking mechanism, front wheel assembly, rear wheel assembly, etc. There are many types of cart frames, but most of them are just folded, and the front wheel assembly and the rear wheel assembly are not folded, so the folded volume is relatively large.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a stroller for children.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a child stroller, comprising a stroller frame with an unfolded position and a folded position, a seat device, a front wheel assembly, and a rear wheel assembly for pushing the pusher a frame locking mechanism in which the frame of the cart is locked in the unfolded position, and the frame of the cart includes side brackets located on the left and right sides,

The side brackets on each side include:

an underframe, and an upper frame structure formed above the underframe;

The chassis includes:

a front wheel support rod, the front wheel assembly is arranged at the front of the front wheel support rod;

a rear wheel support rod, the rear wheel assembly is arranged at the rear of the rear wheel support rod, and the front wheel support rod and the rear wheel support rod can only be installed in a straight line sliding forward and backward;

The bottom base frame, one of the rear wheel support rod and the front wheel support rod, is only rotatably connected to the bottom base frame around the bottom extending forward and backward,

The other one of the rear wheel support rod and the front wheel support rod is arranged with the bottom base frame so as to be able to slide back and forth linearly and also rotate, and is provided with the bottom base frame when the two are displaced back and forth. Drive the relatively rotating sliding synchronization mechanism.

That is, one of the rear wheel support rod and the front wheel support rod only rotates relative to the base frame, and the other of the two can slide and rotate relative to the base frame. When the rear wheel support rod and the front wheel support rod slide relative to each other , the two can rotate relative to the base frame synchronously.

In certain embodiments, the upper frame structure on each side includes:

front strut;

a rear strut, the upper part of the rear strut is pivotally connected with the upper part of the front strut around an upper shaft extending left and right;

A connecting piece, the lower part of the connecting piece can only be rotatably connected to the other of the rear wheel support rod and the front wheel support rod around the bottom two shafts extending front and rear, the bottom two shafts and the bottom one The shafts extend in the same linear direction, the connecting pieces and the base frames are arranged one after the other, and the former of the connecting pieces and the bottom base frames and the lower part of the front struts extend around the upper three shafts left and right. The latter is pivotally connected with the upper two shafts extending around the left and right at the lower part of the rear strut.

In certain embodiments, the upper frame structure on each side further comprises:

a front support slider, the front support slider is slidably arranged on the front support rod along the length direction of the rod of the front support rod;

The driving link is pivotally connected with the upper four-axis extending around the front support slider, and the driving link is pivotally connected with the upper five-axis extending around the rear support rod.

In certain embodiments, the upper frame structure on each side further comprises:

A push rod assembly, the push rod assembly is slidably arranged on the front support rod along the length direction of the rod member of the front support rod, and a sliding linkage is provided between the lower part of the push rod assembly and the front support slider A mechanism, when the push rod assembly slides up or down relative to the front strut, the sliding linkage mechanism makes the front strut also slide up or down.

In some embodiments, the frame locking mechanism includes a whole vehicle locking mechanism disposed between the lower portion of the push rod assembly and the front strut.

In some embodiments, the push rod assembly includes a lower push rod located at the lower part, an upper push rod located at the upper part and telescopically arranged up and down with the lower push rod, and the frame locking mechanism includes a lower push rod disposed on the upper push rod. and the push rod lock mechanism between the lower push rod.

In some embodiments, the rear wheel support rod is rotatably connected to the base frame around the bottom, and the front wheel support rod and the base frame can both linearly slide back and forth and rotate. The rear wheel support rod, the front wheel support rod and the bottom base frame are sleeved with each other.

In some embodiments, the front wheel support rod can be inserted into the rear wheel support rod in a linearly sliding manner forward and backward, and the bottom base frame is sleeved on the rear wheel support rod rotatably around the bottom. The front wheel support rod has a protruding positioning pin, the rear wheel support rod is provided with a straight groove extending forward and backward, the positioning pin is inserted in the straight groove, and the sliding synchronization mechanism includes The guide groove and the positioning pin opened on the bottom base frame, the positioning pin is inserted in the guide groove, the guide groove at least includes a spiral groove segment extending spirally, and the positioning pin is in the spiral groove. During the sliding process in the groove section, the front wheel support rod and the rear wheel support rod rotate synchronously relative to the base frame.

In some embodiments, the bottom frames on the left and right sides are symmetrically arranged, and the distance between the front wheel assembly and the rear wheel assembly when the cart frame is in the unfolded position is greater than the distance between the pusher frame and the rear wheel assembly. the distance between the front wheel assembly and the rear wheel assembly when the frame of the cart is in the folded position; and when the frame of the cart is in the unfolded position, the front wheel assembly and the rear wheel assembly are downward respectively Extending and standing, when the cart frame is in the folded position, the front wheel assemblies on the left and right sides and the rear wheel assemblies on the left and right sides respectively rotate toward each other and fold toward each other.

In some embodiments, the cart frame further includes a plurality of cross bars, and the plurality of cross bars are fixedly connected between the left and right side brackets to form a rigid cart frame.

The scope of the present invention is not limited to the technical solutions formed by a specific combination of the above technical features, but also covers other technical solutions formed by any combination of the above technical features or their equivalents. For example, a technical solution or the like is formed by replacing the above-mentioned features with the technical features disclosed in this application (but not limited to) with similar functions.

Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art: the front wheel support rod and the rear wheel support rod of the chassis can only be relatively slidable, and one of the two can only be rotated relative to the bottom base frame, The other one can rotate and slide synchronously through the sliding synchronization mechanism. When the cart frame is folded, the front wheel support rod and the rear wheel support rod are shortened front and rear, that is, the front wheel support rod, the rear wheel support rod and the base. The front and rear between the three frames are shortened, and under the cooperation of the sliding synchronization mechanism, the front wheel support rod and the rear wheel support rod are synchronously rotated relative to the base frame, that is, after the cart frame is folded, the original standing front wheel The assembly and the rear wheel assembly not only shorten the distance between the front and rear, but also rotate and fold the front wheel assembly and the rear wheel assembly on the left and right sides respectively, making the stroller more compact and flat after being folded.

Description of drawings

Accompanying drawing 1 is the three-dimensional schematic diagram 1 of the stroller in the unfolded position of the embodiment 1;

Accompanying drawing 2 is the three-dimensional schematic diagram 2 of the stroller in the unfolded position according to the first embodiment;

3 is a schematic top view of the stroller in the unfolded position according to Embodiment 1;

4 is a schematic front view of the stroller in the unfolded position of Embodiment 1;

5 is a schematic diagram 1 of the child stroller in the folding process of Embodiment 1;

6 is a schematic diagram 2 of the child stroller in the folding process of Embodiment 1;

7 is a perspective schematic diagram of the stroller in the folded position of the first embodiment;

Accompanying drawing 8 is the disassembled schematic diagram of chassis;

Accompanying drawing 9 is a three-dimensional schematic diagram after the base frame is assembled (the base frame shell is omitted);

Figure 10 is a three-dimensional schematic diagram after the chassis is assembled;

Among them: P1, side bracket; P2, cross bar; W1, front wheel assembly; W2, rear wheel assembly;

1. Bottom frame; 11. Bottom base frame; 111, Guide groove; 12, Front wheel support rod; 121, Positioning pin; 13, Rear wheel support rod; 131, Straight groove; X11, Bottom axis; X12, Bottom two axis;

2. Upper frame structure; 21. Front strut; 22. Rear strut; 23. Connecting piece; 24. Front strut; 25. Driving link; 26. Push rod assembly; 261, Lower push rod;

262, upper push rod; X21, upper axis; X22, upper second axis; X23, upper third axis; X24, upper fourth axis; X25, upper fifth axis.

Detailed ways

Embodiment 1, as shown in Figures 1-10.

A child stroller includes a stroller frame having an unfolded position and a folded position, a seat device, a front wheel assembly W1, a rear wheel assembly W2, and a frame locking mechanism for locking the stroller frame in the unfolded position. As shown in Figures 1-7, the stroller frame includes side brackets P1 located on the left and right sides, and the stroller frame also includes a plurality of cross bars P2, which are fixedly connected to the left and right side brackets P1 Thereby, a rigid cart frame is formed.

As shown in FIG. 4 , the side brackets P1 on each side include: a base frame 1 , and an upper frame structure 2 formed above the base frame 1 .

As shown in Figures 1, 2, 8-10, the chassis 1 includes:

base frame 11;

The rear wheel support rod 13, the rear wheel support rod 13 is only rotatably connected to the bottom base frame 11 around the bottom axis X11 extending front and rear, and the rear wheel assembly W2 is arranged at the rear of the rear wheel support rod 13;

The front wheel support rod 12, the front wheel support rod 12 and the rear wheel support rod 13 can only be arranged in a straight line sliding forward and backward, and the front wheel support rod 12 and the bottom base frame 11 can not only slide linearly along the bottom axis X11 but also around the bottom axis X11 is rotatably arranged, a sliding synchronization mechanism is arranged between the rear part of the front wheel support rod 12 and the base frame 11 to drive relative rotation when the two are displaced back and forth, and the front wheel assembly W1 is arranged at the front of the front wheel support rod 12 department.

The bottom frames 1 on the left and right sides are symmetrically arranged, and the distance between the front wheel assembly W1 and the rear wheel assembly W2 when the cart frame is in the unfolded position is greater than the distance between the front wheel assembly W1 and the rear wheel when the cart frame is in the folded position The distance between the components W2; and when the cart frame is in the unfolded position, the front wheel assembly W1 and the rear wheel assembly W2 extend downward and stand respectively, when the cart frame is in the folded position, the front wheels on the left and right sides The assembly W1 and the left and right rear wheel assemblies W2 are rotated toward each other and folded toward each other.

As shown in Figures 8-10, in detail, the bottom frame 1 is realized, the rear wheel support rod 13, the front wheel support rod 12, and the bottom base frame 11 are nested with each other, and the center line extending forward and backward of the front wheel support rod 12 is The bottom axis X11 coincides. The front wheel support rod 12 can be inserted into the rear wheel support rod 13 in a straight line sliding forward and backward, the bottom base frame 11 is rotatably sleeved on the rear wheel support rod 13 around the bottom axis X11, and the front wheel support rod 12 has a protruding rod. The positioning pin 121 and the rear wheel support rod 13 are provided with a straight groove 131 extending back and forth, and the positioning pin 121 is inserted into the straight groove 131 .

As shown in FIG. 8 , the base frame 11 includes a base frame body and a base frame shell that is fixedly sleeved outside the base frame body, and the two form a whole. The sliding synchronization mechanism includes a guide groove 111 formed on the base frame body of the base frame 11 , and a positioning pin 121 on the front wheel support rod 12 , and the positioning pin 121 is inserted into the guide groove 111 . The guide groove 111 includes a spiral groove section extending spirally and a straight groove section extending front and rear. When the positioning pin 121 is in the straight groove section, the front wheel support rod 12 can only slide forward and backward relative to the base frame 11 and the rear wheel support rod 13 . During the sliding process of the positioning pin 121 in the spiral groove section, the front wheel support rod 12 can drive the rear wheel support rod 13 to rotate synchronously relative to the bottom base frame 11. In this embodiment, the spiral groove section is rotated by 90° by machining. , that is, the front wheel support rod 12 and the rear wheel support rod 13 can rotate 90° relative to the base frame 11, and when folded, the front wheel assembly and the rear wheel assembly on the left and right sides can be rotated and folded to approximately the same plane respectively. It is more compact and flatter when folded.

Alternatively, the bottom frame 1 can also be implemented in this way, not shown in the figure, the front wheel support rod is sleeved on the rear wheel support rod so as to be able to slide forward and backward linearly. The positions of the locating pin and the guide groove are interchanged, that is, the locating pin is arranged on the bottom base frame 11, and the guide groove can be arranged on the front wheel support rod.

In theory, the upper frame structure 2 only needs to be able to promote the telescopic sliding movement of the front wheel support rod 12 relative to the rear wheel support rod 13 . In this embodiment, as shown in Figures 1-7. The upper frame structure 2 on each side includes:

front strut 21;

The rear support rod 22, the upper part of the rear support rod 22 is pivotally connected with the upper part of the front support rod 21 around the upper axis X21 extending left and right, and the lower part of the rear support rod 22 is pivotally connected with the upper two axes X22 extending around the left and right of the base frame 11 ;

In this embodiment, the connecting member 23, the lower part of the connecting member 23 can only be rotatably sleeved on the front wheel support rod 12 around the bottom two axis X12 extending front and rear, and the bottom two axis X12 is in line with the center line of the front wheel support rod 12 extending back and forth. Coinciding, the bottom two axes X12 and the bottom one axis X11 extend in the same straight line direction. The upper part of the connecting piece 23 is pivotally connected with the lower part of the front strut 21 around the upper three axes X23 extending left and right. Because the connecting member 23 and the front wheel support rod 12 can neither turn nor slide in the front and rear, up and down planes, they are regarded as one body, and form a front and rear extension with the bottom frame 11, and are formed with the front support rod 21 and the rear support rod 22. Deformable large triangular mechanism. The connection of the above connecting members 23 is based on the premise that the front wheel support rod 12 is slid back and forth relative to the base frame 11 and rotates, and the rear wheel support rod 13 is rotatably connected to the base frame 11 . Not shown, if the structure of the bottom frame is such that the front wheel support rod 12 can only rotate relative to the bottom base frame 11, and the rear wheel support rod 13 can be slid back and forth and rotate relative to the bottom base frame 11, the lower part of the connecting piece 23 is just It is to be rotatably connected to the rear wheel support rod 13 around the bottom two axes X12, the bottom base frame 11 is located in the front, the connecting piece 23 is located at the rear, and the lower part of the front support rod 21 and the bottom base frame 11 are pivoted around the upper three axis X23 extending from left to right. Shaft connection, the lower part of the rear strut 22 is pivotally connected with the upper two shafts X22 extending around the left and right of the connecting piece 23 .

During the process of retracting the front wheel support rod 12 into the rear wheel support rod 13, that is, indenting and sliding relative to the bottom base frame 11, under the cooperation of the sliding synchronization mechanism, the front wheel support rod 12 is urged to rotate relative to the bottom base frame 11, thereby The rear wheel support rod 13 is also driven to rotate relative to the bottom base frame 11, that is, after the cart frame is folded, the front wheel assembly W1 and the rear wheel assembly W2 that were standing on the same bottom frame move forward and backward, and the distance is shortened, and the left and right sides of the same bottom frame. The front wheel assembly W1 and the rear wheel assembly W2 on the left and right sides are respectively rotated and folded to approximately the same plane, so that the stroller is more compact and flatter after being folded.

In order to make the above-mentioned large triangle mechanism run more smoothly and ensure that when the cart frame is folded, the front wheel support rod 12 is retracted relative to the bottom base frame 11, and the upper frame structure 2 on each side also includes:

The front support slider 24, the front support slider 24 is slidably arranged on the front support rod 21 along the length direction of the rod member of the front support rod 21;

The driving link 25 is pivotally connected with the upper four-axis X24 extending around the front support slider 24, and the driving link 25 is pivotally connected with the rear support rod 22 around the upper five-axis X25 extending left and right;

Push rod assembly 26, the push rod assembly 26 is slidably arranged on the front strut 21 along the length direction of the rod member of the front strut 21, and a sliding linkage mechanism is provided between the lower part of the push rod assembly 26 and the front support slider 24, this embodiment In the example, the sliding linkage mechanism is the cooperation between the chute and the pin. When the push rod assembly 26 slides upward relative to the front support rod 21, the pin hooks the upper end surface of the chute, so that the front support slider 24 also slides upward. When the assembly 26 slides downward relative to the front strut 21, the pin hooks the lower end surface of the chute, so that the front strut 24 also slides downward. Therefore, the sliding linkage mechanism can be realized by cooperating with the pins at the lower part of the push rod assembly 26 and the two blocks provided on the front support slider 24 .

The front strut 24 and the front strut 21 constitute a telescopic rod, and together with the rear strut 22 and the driving link 25 constitute a deformable small triangular mechanism. The small triangular mechanism has the functions of enhancing the rigidity and assisting the folding of the large triangular mechanism. During folding assistance, the push rod assembly 26 is slidably arranged on the front strut 21, thereby initiating the deformation of the small triangle mechanism, thereby driving the large triangle mechanism to deform, rapidly unfold and fold.

In order to make the volume smaller after being folded, the push rod assembly 26 is a telescopic rod, including a lower push rod 261 located at the lower part, and an upper push rod 262 located at the upper part and the lower push rod 261 telescopically arranged up and down.

In this embodiment, the frame locking mechanism includes a vehicle locking mechanism disposed between the lower portion of the push rod assembly 26 and the front strut 21 , and a push rod locking mechanism disposed between the upper push rod 262 and the lower push rod 261 . The vehicle lock mechanism and the push rod lock mechanism are both commonly used and necessary mechanisms in the field of carts, and the specific structures will not be repeated.

The axis line of the bottom axis X11, the axis line of the bottom axis X12, and the center line of the front wheel support rod 12 are raised from the front to the rear and upward, forming an included angle a with the horizontal plane, and the angle of the included angle a is 3 °. The bottom frame 1 is inclined at 3°, so that the center of gravity of the cart frame in the unfolded position is more stable, and it is convenient for the front wheel support rod 12 to retract relative to the bottom base frame 11 when folded.

The second embodiment, not shown in the figure, the difference between the second embodiment and the first embodiment is that the structure of the upper frame is different. The upper frame structure includes a front strut, a lower end and an axis pivot extending from the left and right of the upper end of the front strut. The connected push rod assembly, the rear support rod whose upper end is pivotally connected with the push rod assembly around the axis extending left and right, the connecting piece that is directly rotated and sleeved on the front part of the front wheel support rod along the axis extending forward and backward, the front support rod is connected to the The connecting piece is pivotally connected around the shaft extending from left to right, and the lower end of the rear strut is pivotally connected to the base frame around the shaft extending from left to right. When folded, the push rod assembly is turned forward, and the rear support rod is dragged to move forward, so that the front wheel assembly and the rear wheel assembly of the same chassis can move forward and backward, and the front wheel assembly and the rear wheel assembly on the left and right sides face each other. When rotated and folded to approximately the same plane, the stroller is more compact and flat after being folded.

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those who are familiar with the art to understand the content of the present invention and implement them accordingly, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. A stroller comprising a stroller frame having an unfolded position and a folded position, a seat unit, a front wheel assembly (W1), a rear wheel assembly (W2), a frame locking mechanism for locking the stroller frame in the unfolded position, the stroller frame comprising side brackets (P1) at both left and right sides,

the method is characterized in that:

the side brackets (P1) of each side include:

the device comprises a bottom frame (1) and an upper frame structure (2) formed above the bottom frame (1);

the chassis (1) comprises:

a front wheel strut (12), the front wheel assembly (W1) being disposed forward of the front wheel strut (12);

a rear wheel strut (13), the rear wheel assembly (W2) being disposed at the rear of the rear wheel strut (13), the front wheel strut (12) and the rear wheel strut (13) being disposed so as to be linearly slidable only forward and backward;

one of the base frame (11), the rear wheel strut (13) and the front wheel strut (12) is connected to the base frame (11) only in a rotatable manner about a base axis (X11) extending in the front-rear direction,

the other of the rear wheel support rod (13) and the front wheel support rod (12) and the bottom base frame (11) can linearly slide back and forth and can also be rotatably arranged, and a sliding and rotating synchronous mechanism which drives the relative rotation when the rear wheel support rod and the bottom base frame (11) move back and forth is arranged between the rear wheel support rod and the front wheel support rod.

2. The stroller of claim 1, wherein: the upper frame structure (2) of each side comprises:

a front stay (21);

a rear stay (22), the upper part of the rear stay (22) is pivotally connected with the upper part of the front stay (21) around an upper shaft (X21) extending leftwards and rightwards;

a connecting member (23), the lower part of the connecting member (23) is rotatably connected to the other of the rear wheel strut (13) and the front wheel strut (12) only around a bottom biaxial (X12) extending forwards and backwards, the bottom biaxial (X12) and the bottom axial (X11) extend in the same linear direction, the connecting member (23) is arranged in tandem with the bottom base frame (11), the former of the connecting member (23) and the bottom base frame (11) is pivotally connected with the lower part of the front strut (21) around an upper triaxial (X23) extending leftwards and rightwards, and the latter of the connecting member (23) and the bottom base frame (11) is pivotally connected with the lower part of the rear strut (22) around an upper biaxial (X22) extending leftwards and rightwards.

3. The stroller of claim 2, wherein: the upper frame structure (2) of each side further comprises:

a front stay slider (24), the front stay slider (24) is arranged on the front stay (21) in a sliding manner along the length direction of the rod of the front stay (21);

a drive link (25), the drive link (25) is pivotally connected with the front stay (24) around an upper four-axis (X24) extending left and right, and the drive link (25) is pivotally connected with the rear stay (22) around an upper five-axis (X25) extending left and right.

4. The stroller of claim 3, wherein:

the upper frame structure (2) of each side further comprises:

the push rod assembly (26), push rod assembly (26) follow the member length direction of preceding vaulting pole (21) sets up with sliding on preceding vaulting pole (21), push rod assembly (26) lower part with be provided with the slip link gear between preceding vaulting pole (24), when push rod assembly (26) are relative when preceding vaulting pole (21) upwards or slide downwards, the slip link gear makes preceding vaulting pole (24) also upwards or slide downwards.

5. The stroller of claim 4, wherein: the frame locking mechanism comprises a whole vehicle locking mechanism arranged between the lower part of the push rod assembly (26) and the front support rod (21).

6. The stroller of claim 4, wherein: push rod subassembly (26) including be located the lower part push rod (261), be located upper portion with push rod (261) is down the last push rod (262) of flexible setting, frame locking mechanical system including set up in last push rod (262) with push rod latch mechanism between push rod (261) down.

7. Child stroller according to any one of claims 1-6, characterized in that: the rear wheel supporting rod (13) is rotatably connected to the bottom base frame (11) around the bottom shaft (X11), the front wheel supporting rod (12) and the bottom base frame (11) can linearly slide back and forth and can be rotatably arranged, and the rear wheel supporting rod (13), the front wheel supporting rod (12) and the bottom base frame (11) are mutually sleeved.

8. The stroller of claim 7, wherein: the front wheel supporting rod (12) can be inserted into the rear wheel supporting rod (13) in a front-back linear sliding way, the bottom base frame (11) can be sleeved on the rear wheel support rod (13) in a rotating way around the bottom shaft (X11), the front wheel supporting rod (12) is provided with a convex positioning pin (121), the rear wheel supporting rod (13) is provided with a straight groove (131) extending forwards and backwards, the positioning pin (121) is inserted in the straight groove (131), the sliding and rotating synchronous mechanism comprises a guide groove (111) arranged on the bottom base frame (11) and the positioning pin (121), the positioning pin (121) is inserted in the guide groove (111), the guide groove (111) at least comprises a spirally extending spiral groove section, and in the process that the positioning pin (121) slides in the spiral groove section, the front wheel supporting rod (12) and the rear wheel supporting rod (13) synchronously rotate relative to the bottom base frame (11).

9. Child stroller according to any one of claims 1-6, characterized in that: the underframe (1) at the left side and the right side are symmetrically arranged, and the distance between the front wheel assembly (W1) and the rear wheel assembly (W2) when the trolley frame is in the unfolding position is larger than the distance between the front wheel assembly (W1) and the rear wheel assembly (W2) when the trolley frame is in the folding position; when the stroller frame is in the unfolded position, the front wheel assemblies (W1) and the rear wheel assemblies (W2) respectively extend downwards to stand, and when the stroller frame is in the folded position, the front wheel assemblies (W1) on the left side and the rear wheel assemblies (W2) on the right side and the left side respectively rotate in opposite directions and are folded towards each other.

10. Child stroller according to any one of claims 1-6, characterized in that: the trolley frame further comprises a plurality of cross rods (P2), and the cross rods (P2) are fixedly connected between the left side bracket (P1) and the right side bracket (P1) to form a rigid trolley frame.

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