CN108394449A - A kind of children trolley - Google Patents

Abstract

The invention discloses a children's stroller, which comprises a transversely foldable stroller frame and a wheel assembly in an unfolded state and a folded state, the stroller frame includes a side bracket, a backrest frame and a connecting frame, and the backrest frame It includes side backrests connected to the corresponding side brackets on the left and right sides and a link frame assembly arranged between the side backrests on both sides. The side backrests on each side have upper backrest bars that can slide relatively and The lower backrest rod, when the vehicle frame is in the unfolded state, the upper backrest rod is far away from the lower backrest rod, and the connecting frame assembly is unfolded; when the vehicle frame is converted from the unfolded state to the folded state, the two The side brackets on the side are close to each other, the backrest frames on both sides are close to each other, and the lower backrest bar and the upper backrest bar slide towards each other; by setting the backrest frame that can be folded horizontally and the height becomes lower after folding, the entire baby stroller can be folded. The volume in the height direction becomes smaller, which is convenient for transportation and storage.

Description

a stroller for children

technical field

The invention relates to the field of children's stroller accessories, in particular to a children's stroller.

Background technique

A child stroller in the prior art includes a stroller frame in a folded state and an unfolded state, a wheel assembly arranged at the lower part of the stroller frame, and a wheel assembly for locking the stroller frame in unfolded state. state, the cart frame includes a first side bracket, a second side bracket, a backrest frame and a connecting frame that can be folded horizontally for connecting the first side bracket and the second side bracket, so The backrest frame and the connecting frame are arranged between the first side frame and the second side frame. When the stroller frame is in the folded state, the backrest frame still has a very high height, so that the overall volume of the stroller is still large.

Contents of the invention

In order to solve the problems of the prior art, the present invention provides a stroller for children, the technical solution is as follows:

A children's stroller, comprising a transversely foldable stroller frame with an unfolded state and a folded state, and a wheel assembly arranged at the lower part of the stroller frame, the stroller frame includes Side brackets and a backrest frame connected between the side brackets on both sides, the backrest frame includes:

The side backrests located on the left and right sides and the connecting frame assembly arranged between the side backrests on both sides in a horizontally foldable manner, the side backrests on each side respectively include an upper backrest bar and a lower backrest which are slidably connected a rod, and the side back frame on each side is respectively connected with the side bracket on the same side;

When the vehicle frame is in the unfolded state, the upper backrest bar is far away from the lower backrest bar, and the connecting frame assembly is unfolded; when the vehicle frame is transformed from the unfolded state to the folded state, the side The backrests move closer to each other, and the connecting frame assembly is folded and moved closer to drive the upper backrest bar to slide towards the direction of the lower backrest bar.

Preferably, the connecting frame assembly includes a first link assembly and a second link assembly that intersects with the first link assembly and is rotatably connected around six rotation axes at the intersection, the first link assembly It includes a connecting rod or a plurality of connecting rods that are connected to rotate around the six-second rotation axis in turn. Both ends in the length direction of a link assembly and two ends in the length direction of the second link assembly are respectively rotatably connected to the side back frames on both sides.

Further preferably, the first link assembly includes a first link, the second link assembly includes a second link, and the first link is connected to the second link around the six-axis. Rotationally connected, the two ends of the first connecting rod and the two ends of the second connecting rod are respectively rotatably connected with the side back frames on both sides.

Further preferably, the first link assembly includes a first link and a third link, and the second link assembly includes a second link and a fourth link,

One end of the third connecting rod is rotatably connected with one end of the first connecting rod around the six-second rotating shaft, and the other end of the third connecting rod and the other end of the first connecting rod are respectively connected to the two sides. The side back frame is rotatably connected; one end of the fourth connecting rod is rotatably connected with one end of the second connecting rod around the six-three rotating shaft, and the other end of the fourth connecting rod is connected to the second connecting rod. The other end of the connecting rod is respectively rotatably connected with the side back frames on both sides.

Further preferably, one end of the first link assembly in the length direction is rotatably connected to the second upper back bar in the upper back bar around a 92-axis, and the other end of the first link assembly in the length direction Rotately connected with the first lower backrest rod in the lower backrest rods around the eight-one rotating shaft;

One end of the lengthwise direction of the second link assembly is rotatably connected with the second lower backrest bar of the lower backrest bars around a rotation axis, and the other end of the lengthwise direction of the second link assembly is connected to the upper backrest bar. The first upper back bar in the back bar is rotatably connected around eighty-two rotating shafts.

Further preferably, the side backrest frames are respectively connected to the side frames on the same side around the rotation axis.

Further preferably, the lower part of the first lower backrest bar is rotatably connected to the first side bracket of the side brackets around one of the rotating shafts, and the upper part of the first lower backrest bar is fixedly provided with a second a guide mechanism, the first upper backrest bar is slidably arranged in the first guide mechanism;

The lower part of the second lower backrest bar is rotatably connected to the second side bracket of the side brackets around one or two of the rotating shafts, and the upper part of the second lower backrest bar is fixedly provided with a second guide mechanism, The second upper backrest bar is slidably arranged in the second guide mechanism;

The upper back bars are located between the lower back bars.

Further preferably, one end of the first link assembly in the length direction is rotatably connected to the lower part of the second upper backrest bar around the ninety-two rotation axis, and the other end of the first link assembly in the length direction is connected to The first guiding mechanism is rotatably connected around the eighty-one rotating shaft;

One end of the second link assembly in the length direction is rotatably connected to the lower part of the first upper backrest bar around the eighty-two rotating shaft, and the other end of the second link assembly in the length direction is connected to the second The guide mechanism is rotatably connected around the nine rotating shafts.

Further preferably, the axial direction of the six-one rotating shaft, the axial direction of the six-two rotating shaft, the axial direction of the six-three rotating shaft, the axial direction of the eighty-one rotating shaft, the axial direction of the eighty-two rotating shaft, the The axial directions of the ninety-one rotating shaft and the ninety-two rotating shaft are parallel to each other.

Further preferably, the axial directions of the six rotating shafts are perpendicular to the axial directions of one of the rotating shafts.

Further preferably, when the stroller frame is in the folded state, the height of the backrest frame is not higher than the height of the side frame.

The beneficial effects brought by the technical solution provided by the invention are as follows:

The children's stroller in the present invention is provided with a backrest frame that can be folded horizontally and the height becomes lower after being folded. The setting of the backrest frame makes the volume of the entire children's stroller smaller in the height direction after being folded, which is convenient for transportation and storage .

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic diagram of the structure of the stroller provided by Embodiment 1 of the present invention when it is in an unfolded state;

Fig. 2 is a schematic structural view of the backrest frame when the baby stroller provided by Embodiment 1 of the present invention is in an unfolded state;

Fig. 3 is a schematic structural view of the backrest frame when the stroller is in a folded state according to Embodiment 1 of the present invention;

Fig. 4 is a schematic structural view of the backrest frame when the baby stroller provided by the second embodiment of the present invention is in the unfolded state;

Fig. 5 is a schematic structural view of the backrest frame when the stroller is in a folded state according to Embodiment 2 of the present invention;

Fig. 6 is a side view of the children's stroller provided by the present invention in the process of being folded;

Fig. 7 is a three-dimensional schematic diagram of the children's stroller provided by the present invention when it is in the folding process;

Fig. 8 is a side view of the stroller provided by the present invention in a folded state.

Wherein, reference numerals are: 11: first side bracket; 12: second side bracket; 2: wheel assembly; 3: backrest frame; 31: first side backrest frame; 311: first upper backrest bar; 312: second Two upper backrest bars; 313: first guiding mechanism; 32: second side backrest frame; 321: second upper backrest bar; 322: second lower backrest bar; 323: second guiding mechanism; 33: link frame assembly; 331: first connecting rod assembly; 3311: first connecting rod; 3321: second connecting rod; 3312: third connecting rod; 3322: fourth connecting rod; 332: second connecting rod assembly; 1002: 12 reels; 6001: 61 reels; 6002: 62 reels; 6003: 63 reels; 8001: 81 reels; 8002: 82 reels; 9001: 91 reels; 9002: 92 reels.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, means, product or equipment comprising a series of steps or elements need not be limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

Embodiment one

In one embodiment of the present invention, as shown in Figures 1-3, a child stroller is provided, including a stroller frame with an unfolded state and a folded state, and wheels arranged at the lower part of the stroller frame Component 2 and a locking device (not shown in the figure) for keeping the cart frame in an unfolded state. The cart frame includes a first side bracket 11, a second side bracket 12, a backrest frame 3 and a The connection frame 4 that can be folded horizontally is connected to the first side frame 11 and the second side frame 12. The connection frame 4 is arranged between the first side frame 11 and the second side frame 12. The connection frame 4 in this embodiment The effect is that when the cart frame is in the unfolded state, its transverse rigidity is relatively strong, and the folding of the cart frame is not affected. During the folding process, the lateral volume of the cart frame can be reduced; preferably, the structure adopts an X-shaped support frame.

Each side bracket 11,12 in the present embodiment all comprises the front vehicle frame that is provided with wheel assembly 2 at the bottom, the rear vehicle frame that is provided with wheel assembly 2 at the bottom, lower push rod, upper push rod, rear swing bar and seat bar The rear vehicle frame, the lower push rod, the upper push rod and the rear swing rod form a four-link structure; the front frame is rotatably connected with the lower push rod, and the seat rod is rotatably connected with the rear swing rod. The rear vehicle frame is slidably provided with a sliding sleeve, and the side supports 11, 12 also include a rear strut and a front strut, one end of the rear strut is rotatably connected with the sliding sleeve, and the other end of the rear strut is connected with the lower push rod. Rotatably connected; one end of the front strut is rotatably connected with the sliding sleeve, and the other end of the front strut is rotatably connected with the front vehicle frame. The sliding sleeve is also used to drive the folding of the connecting frame 4 in the process of folding the cart frame.

The back frame 3 is also arranged between the first side frame 11 and the second side frame 12, and the back frame 3 further includes:

A first side backrest frame 31 comprising a first upper backrest bar 311 and a first lower backrest bar 312, the first upper backrest bar 311 is slidably connected with the first lower backrest bar 312 along the length direction of the first lower backrest bar 312 , the first side back frame 31 is rotatably connected with the first side bracket 11 around a rotating shaft 1001;

The second side backrest frame 32 comprising a second upper backrest bar 321 and a second lower backrest bar 322, the second upper backrest bar 321 is slidably connected with the second lower backrest bar 322 along the length direction of the second lower backrest bar 322 , the second side back frame 32 is rotatably connected with the second side frame 12 around one or two rotating shafts 1002, specifically, the side back frames 31, 32 in this embodiment are respectively rotatably connected with the seat bars on both sides, one by one rotating shaft 1001 The axial direction is parallel to the axial direction of the first and second rotating shafts 1002;

The link frame assembly 33, the first side back frame 31 and the second side back frame 32 are connected through the transversely foldable link frame assembly 33;

When the vehicle frame is in the unfolded state, the upper backrest bars 311, 321 are far away from the lower backrest bars 312, 322, and the connecting frame assembly 33 is unfolded; The side brackets 12 move closer together, driving the first side backrest frame 31 to move closer to the second side backrest frame 32, and simultaneously driving the first lower backrest bar 312 and the first upper backrest bar 311 to slide toward each other, and the second lower backrest bar 322 and the second upper backrest bar 322 and the second upper backrest bar. The back bars 321 slide toward each other.

In this embodiment, the lower part of the first lower backrest bar 312 is rotatably connected with the first side bracket 11 around a rotating shaft 1001, and the upper part of the first lower backrest bar 312 is fixedly provided with a first guide mechanism 313. The first upper backrest bar 311 is slidably set in the first guide mechanism 313;

The bottom of the second lower backrest bar 322 is rotatably connected with the second side bracket 12 around one or two rotating shafts 1002, the upper part of the second lower backrest bar 322 is fixedly provided with a second guide mechanism 323, and the second upper backrest bar 321 is slidably arranged on In the second guiding mechanism 323 . The guiding mechanism of the first guiding mechanism 313 and the second guiding mechanism 323 in this embodiment is a sliding sleeve, which has at least two oppositely arranged side walls and a bottom wall that fixedly connects the two side walls, The two side walls of the guide mechanism are respectively fixedly connected with the front wall and the rear wall of the lower backrest bar (comprising the first lower backrest bar 312 and the second lower backrest bar 322), and the bottom wall of the guide mechanism corresponds to the lower backrest bar. A guide compartment is formed between the side walls, and the guide compartment is adapted to the outer diameter of the upper backrest bar (including the first upper backrest bar 311 and the second upper backrest bar 321 ), and the upper backrest bar is slidably arranged in the guide compartment. Structures similar to the specific structure of the guide mechanism 313 given in this embodiment or structures with the same function all belong to the protection scope of the invention.

Further, the first upper back bar 311 in this embodiment is located on the side of the first lower back bar 312 close to the second side back frame 32; the second upper back bar 321 is located on the second lower back bar 322 near the first side One side of the back frame 31.

Wherein, the link frame assembly 33 includes a first link assembly 331 and a second link assembly 332 which intersects with the first link assembly 331 and is rotatably connected around the six-one rotating shaft 6001 at the intersection. The first link assembly 331 It includes a connecting rod or a plurality of connecting rods that are connected to rotate around the sixth and second rotating shafts 6002 in turn. Both ends of the link assembly 331 in the length direction and both ends of the second link assembly 332 in the length direction are respectively rotatably connected to the side back frames 31 and 32 on both sides.

One end of the first link assembly 331 is rotatably connected with the second upper backrest bar 321 around the ninety-two rotating shaft 9002, and the other end of the first link assembly 331 is rotatably connected with the first lower backrest bar 312 around the eighth one rotating shaft 8001; One end of the second link assembly 332 is rotatably connected with the second lower backrest bar 322 around the ninety-one rotating shaft 9001 , and the other end of the second link assembly 332 is rotatably connected with the first upper backrest bar 311 around the eighth-two rotating shaft 8002 .

Specifically, one end of the first link assembly 331 is rotatably connected with the lower part of the second upper backrest bar 321 around the ninety-two rotation axis 9002, and the other end of the first link assembly 331 is connected with the first guide mechanism 313 around the eighth one rotation axis 8001. Rotational connection; one end of the second link assembly 332 is rotatably connected with the bottom of the first upper backrest bar 311 around the eighty-two rotating shaft 8002, and the other end of the second connecting rod assembly 332 is connected with the second guide mechanism 323 around the ninety-one rotating shaft 9001 Turn to connect.

In this embodiment, one link included in the first link assembly 331 is the first link 3311, one link included in the second link assembly 332 is the second link 3321, and the first link 3311 is wound around six A rotating shaft 6001 is rotatably connected with the second connecting rod 3321 . One end of the first connecting rod 3311 is rotatably connected with the second upper backrest bar 321 around the ninety-two rotating shaft 9002, and the other end of the first connecting rod 3311 is rotatably connected with the first lower backrest bar 312 around the eighth one rotating shaft 8001; One end of the rod 3321 is rotatably connected with the second lower back bar 322 around the ninety-one rotating shaft 9001, and the other end of the second connecting rod 3321 is rotatably connected with the first upper back bar 311 around the eighty-two rotating shaft 8002.

Among the rotating shafts in this embodiment, the axial direction of the sixth rotating shaft 6001, the axial direction of the sixth rotating shaft 6002, the axial direction of the sixth rotating shaft 6003, the axial direction of the eighth rotating shaft 8001, the axial direction of the eighth rotating shaft 8002, the axial direction of the ninth rotating shaft The axis of the first rotating shaft 9001 and the axial direction of the ninth and second rotating shaft 9002 are parallel to each other. The axial directions of the six-one rotating shafts 6001 are perpendicular to the axial directions of the one-by-one rotating shafts 1001 .

As shown in Figure 1, when the stroller frame of the children's stroller with the back frame 3 provided in the present invention is in the unfolded state, the first side back frame 31 and the second side back frame 32 play the role of the link frame assembly 33. The bottom is rigidly supported, the overlapped portion of the first upper backrest bar 311 and the first lower backrest bar 312 in the length direction is the least, and the overlapped portion of the second upper backrest bar 321 and the second lower backrest bar 322 in the length direction is the least, so that The total length of the first side back frame 31 and the second side back frame 32 is the longest. At this time, the direction of the back bar is set upward, and provides back support for children by cooperating with the seat cover and the like.

When the stroller frame of the stroller is folded from the unfolded state to the folded state, as shown in Figure 6-7, while the volume of the stroller is reduced in the front and back directions and in the overall height direction, under the action of the connecting frame 4, the third One side bracket 11 moves closer to the second side bracket 12, and at the same time, the backrests on both sides move closer to each other. Under the action of the link frame assembly 33, the first upper backrest bar 311 and the first lower backrest bar 312 are driven to slide toward each other, so that The overlapping parts in the length direction increase; the second upper backrest bar 321 and the second lower backrest bar 322 slide toward each other, so that the overlapping parts in the length direction increase. When the stroller frame of the stroller is in the folded state, as shown in Figure 3 and Figure 8, the overlapping parts between the upper backrest bars 311, 321 and the lower backrest bars 312, 322 have reached the maximum, and the non-overlapping parts are respectively the first The bottom of the first upper backrest bar 311 and the second upper backrest bar 321. At this time, the height of the backrest frame 3 is not higher than the height of the side brackets 11, 12, so that the overall height of the backrest frame 3 becomes smaller, greatly reducing children's push. The volume in the height direction of the cart frame in the folded state.

Embodiment two

Another embodiment of the present invention provides a stroller for children, as shown in FIGS. 4-5 , which is different from Embodiment 1 in that the structure of the link frame assembly 33 in the back frame 3 is different.

In this embodiment, the multiple connecting rods included in the first connecting rod assembly 331 are respectively the first connecting rod 3311 and the third connecting rod 3312, and the multiple connecting rods included in the second connecting rod assembly 332 are respectively the second connecting rod 3321. And the fourth connecting rod 3322, the first connecting rod 3311 is rotatably connected with the second connecting rod 3321 around the 61 rotating shaft 6001, and one end of the third connecting rod 3312 is rotatably connected with one end of the first connecting rod 3311 around the 62 rotating shaft 6002 One end of the fourth connecting rod 3322 is rotatably connected with one end of the second connecting rod 3321 around the six-three rotating shaft 6003 .

One end of the first connecting rod 3311 is rotatably connected with the second upper backrest rod 321 around the ninety-two rotating shaft 9002, and the other end of the third connecting rod 3312 is connected with the first guide mechanism 313 fixed on the first lower backrest rod 312 around the eighth one. The rotating shaft 8001 is connected in rotation; one end of the fourth connecting rod 3322 is connected in rotation with the second guide mechanism 323 fixed on the second lower backrest bar 322 around the rotating shaft 9001, and the other end of the second connecting rod 3321 is connected with the first upper backrest rod 322. The back bar 311 is rotatably connected around the eighth-two rotating shaft 8002 .

Similar to Embodiment 1, when the stroller frame of the children's stroller with the backrest frame 3 provided in the present invention is in the unfolded state, the first side backrest frame 31 and the second side backrest frame 32 play a role in the link frame assembly 33 The bottom is rigidly supported, the overlapped portion of the first upper backrest bar 311 and the first lower backrest bar 312 in the length direction is the least, and the overlapped portion of the second upper backrest bar 321 and the second lower backrest bar 322 in the length direction is the least, so that The total length of the first side back frame 31 and the second side back frame 32 is the longest. At this time, the direction of the back bar is set upward, and provides back support for children by cooperating with the seat cover and the like.

When the stroller frame of the stroller is folded from the unfolded state to the folded state, as shown in Figure 6-7, while the volume of the stroller is reduced in the front and back directions and in the overall height direction, under the action of the connecting frame 4, the third One side bracket 11 moves closer to the second side bracket 12, and at the same time, the backrests on both sides move closer to each other. Under the action of the link frame assembly 33, the first upper backrest bar 311 and the first lower backrest bar 312 are driven to slide toward each other, so that The overlapping parts in the length direction increase; the second upper backrest bar 321 and the second lower backrest bar 322 slide toward each other, so that the overlapping parts in the length direction increase. When the stroller frame of the stroller is in the folded state, as shown in Figure 5 and Figure 8, the overlapping parts between the upper backrest bars 311, 321 and the lower backrest bars 312, 322 have reached the maximum, and the height of the backrest frame 3 is not high now. Due to the height of the side brackets 11 and 12, the overall height of the backrest frame 3 becomes smaller, which greatly reduces the volume of the stroller frame of the children's stroller in the folded state in the height direction. The difference from Embodiment 1 is that the non-overlapping parts in this embodiment are the upper part of the first upper backrest bar 311 and the upper part of the second upper backrest bar 321 respectively.

Further, the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection of the invention.

Claims (10)

1. A stroller for children, comprising a transversely foldable stroller frame with an unfolded state and a folded state, and a wheel assembly (2) arranged at the lower part of the stroller frame, the stroller frame includes The side brackets (11, 12) located on the left and right sides and the backrest frame (3) connected between the side brackets (11, 12) on both sides, characterized in that the backrest frame (3) includes: The side back frames (31, 32) on the left and right sides respectively and the connecting frame assembly (33) arranged between the side back frames (31, 32) on both sides in a horizontally foldable manner, the side backs on each side The frames (31, 32) respectively include an upper backrest bar (311, 321) and a lower backrest bar (312, 322) that are slidably connected, and the side backrest frames (31, 32) on each side are respectively connected to the side brackets (11, 32) on the same side. 12) connected; When the vehicle frame is in the unfolded state, the upper backrest bar (311, 321) is far away from the lower backrest bar (312, 322), and the connecting frame assembly (33) is unfolded; when the vehicle frame is from the unfolded state to the folded When the state is changed, the side backrests (31, 32) on both sides move closer to each other, and the connecting frame assembly (33) is folded closer to drive the upper backrest rod (311, 321) to slide toward the direction of the lower backrest rod (312, 322) . 2. The stroller according to claim 1, characterized in that: the connecting frame assembly (33) includes a first link assembly (331) and intersects with the first link assembly (331) and The second connecting rod assembly (332) connected in rotation around the six-one rotating shaft (6001) at the intersection, the first connecting rod assembly (331) includes one or more connecting rods that rotate around the six-two rotating shaft (6002) in turn connected connecting rods, the second connecting rod assembly (332) includes one connecting rod or a plurality of connecting rods connected in rotation around the six-three rotating shafts (6003) in turn, the length of the first connecting rod assembly (331) The two ends in the direction and the two ends in the length direction of the second link assembly (332) are respectively rotatably connected with the side back frames (31, 32) on both sides. 3. The stroller according to claim 2, characterized in that: the first link assembly (331) includes a first link (3311), and the second link assembly (332) includes a second link Rod (3321), the first connecting rod (3311) is rotatably connected to the second connecting rod (3321) around the six-one rotating shaft (6001), the two ends of the first connecting rod (3311) and Both ends of the second connecting rod (3321) are respectively rotatably connected to the side back frames (31, 32) on both sides. 4. The stroller according to claim 2, characterized in that: the first link assembly (331) includes a first link (3311) and a third link (3312), and the second link The assembly (332) includes a second link (3321) and a fourth link (3322), One end of the third connecting rod (3312) is rotatably connected with one end of the first connecting rod (3311) around the six-second rotating shaft (6002), and the other end of the third connecting rod (3312) and the The other end of the first connecting rod (3311) is rotatably connected with the side back frames (31, 32) on both sides; one end of the fourth connecting rod (3322) is connected with One end of the second connecting rod (3321) is rotatably connected, and the other end of the fourth connecting rod (3322) and the other end of the second connecting rod (3321) are respectively connected to the side back frames ( 31, 32) phase rotation connection. 5. The stroller according to claim 2, characterized in that: One end in the length direction of the first link assembly (331) is rotatably connected with the second upper backrest rod (321) of the upper backrest rods (311, 321) around the ninety-two rotation axis (9002), and the first linkage The other end of the rod assembly (331) in the length direction is rotatably connected with the first lower backrest rod (312) of the lower backrest rods (312, 322) around the Bayi rotating shaft (8001); One end of the second link assembly (332) in the length direction is rotatably connected with the second lower backrest rod (322) of the lower backrest rods (312, 322) around the ninety-one rotating shaft (9001), and the second linkage The other end of the rod assembly (332) in the length direction is rotatably connected with the first upper backrest rod (311) among the upper backrest rods (311, 321) around the eighty-two rotation axis (8002). 6. The stroller according to claim 5, characterized in that: the side back frames (31, 32) are respectively connected to the side brackets (11, 12) on the same side around the rotation axis (1001, 1002) . 7. The stroller according to claim 6, characterized in that: The lower part of the first lower backrest bar (312) rotates with the first side bracket (11) of the side brackets (11, 12) around one of the rotation shafts (1001, 1002) (1001) connected, the upper part of the first lower backrest bar (312) is fixedly provided with a first guide mechanism (313), and the first upper backrest bar (311) is slidably arranged in the first guide mechanism (313); The lower part of the second lower backrest bar (322) rotates with the second side bracket (12) of the side brackets (11, 12) around one or two of the rotation shafts (1001, 1002) (1002) connected, the upper part of the second lower backrest bar (322) is fixedly provided with a second guide mechanism (323), and the second upper backrest bar (321) is slidably arranged in the second guide mechanism (323); The upper back bars (311, 321) are located between the lower back bars (312, 322). 8. The stroller according to claim 7, characterized in that: One end in the length direction of the first link assembly (331) is rotatably connected with the lower part of the second upper backrest bar (321) around the ninety-two rotation axis (9002), and the first link assembly (331 The other end in the length direction of ) is rotatably connected with the first guiding mechanism (313) around the eighty-one rotating shaft (8001); One end in the length direction of the second link assembly (332) is rotatably connected with the lower part of the first upper backrest bar (311) around the eighty-two rotating shaft (8002), and the second link assembly (332 ) and the other end in the length direction are rotatably connected with the second guide mechanism (323) around the ninety-one rotating shaft (9001). 9. The stroller according to claim 6, characterized in that: the axial direction of the six-one rotating shaft (6001), the axial direction of the six-two rotating shaft (6002), the axial direction of the six-three rotating shaft (6003) Axial direction, the axial direction of the 81 rotating shaft (8001), the axial direction of the 82 rotating shaft (8002), the axial direction of the 91 rotating shaft (9001) and the axial direction of the 92 rotating shaft (9002) parallel to each other; the axial directions of the six rotating shafts (6001) are perpendicular to the axial directions of the rotating shafts (1001) among the rotating shafts (1001, 1002). 10. The children's stroller according to any one of claims 1-9, characterized in that, when the stroller frame is in the folded state, the height of the backrest frame (3) is not higher than that of the side brackets ( 11,12) height.