CN215904566U - Children's barrow - Google Patents

Abstract

The utility model discloses a children cart, which comprises a frame with an unfolding state and a folding state, a front wheel assembly, a rear wheel assembly and a locking mechanism, wherein the frame comprises two groups of side supports arranged on the left side and the right side respectively, and a cross support assembly connected between the two groups of side supports, each side support comprises a front support, a rear support, a push rod support, a seat support and a handrail support, the three parts of the upper part of the front support, the upper part of the rear support and the front part of the handrail support are rotatably connected around the same rotation central line, a sliding part is rotatably arranged on the lower part of the push rod support, the cross support assembly can be telescopically arranged between the two groups of side supports along the left-right direction, the frame also comprises a linkage device, and when the frame is switched between the unfolding state and the folding state, the linkage device drives the cross support assembly to telescopically extend along the left-right direction. When the baby stroller is converted between the unfolding state and the folding state, the stroller is linked with the frame to be transversely opened or folded, the operation is simple and convenient, the size is small after the stroller is folded, and the stroller is convenient to store and carry.

Description

Children's barrow

Technical Field

The utility model relates to a baby stroller.

Background

Most of the existing stroller are foldable for reducing the volume, wherein the size of the stroller in the up-down and front-back directions can be reduced by folding the stroller, but the stroller has a larger size in the transverse direction, so that the stroller is inconvenient for a user to carry outside. In addition, although some stroller can be folded transversely, the transverse folding can be completed only by performing multi-step operation in the folding process, and the operation burden of the user is heavy. Therefore, it is an effort of those skilled in the art to provide a stroller that can be folded in a transverse direction and is convenient for folding operation.

Disclosure of Invention

The utility model aims to provide a novel child stroller.

In order to achieve the purpose, the utility model adopts the technical scheme that: the utility model provides a children's shallow, including the frame that has expansion state and fold condition, locate the front wheel subassembly and the rear wheel subassembly of frame bottom, and be used for with the locking mechanical system of frame locking under the expansion state, the frame is including dividing two sets of collateral branch framves of locating the left and right sides, connect two sets of the stull subassembly between the collateral branch frame, the collateral branch frame includes fore-stock, after-poppet, push rod frame, seat frame and handrail frame, wherein, two parts in the upper portion of fore-stock, the upper portion of after-poppet and the anterior these three parts of handrail frame are connected with rotating ground and the third part is connected with one part in the aforesaid two parts rotating ground, perhaps the upper portion of fore-stock, the upper portion of after-poppet and these three parts of the anterior of handrail frame are connected around same rotation center line rotating ground,

the rear portion of handrail frame sets up with rotating on the push rod frame, the lower part of push rod frame is provided with the slider with rotating, the slider is followed the length extending direction of after-poppet locates with sliding relatively on the after-poppet, a tip of seat frame is connected with rotating on the fore-stock, another tip of seat frame is connected with rotating on the slider or on the push rod frame, the stull subassembly can be followed left right direction and set up two sets of telescopically between the collateral branch frame, the frame still includes aggregate unit, the frame is when switching between expansion state and fold condition, aggregate unit orders about the stull subassembly is followed left right direction and is stretched out and drawn back.

Preferably, the wale assembly includes at least:

the transverse supporting rod extends along the left-right direction and is arranged between the sliding parts on the left side and the right side, the transverse supporting rod comprises a first rod and a second rod which are connected in a sliding and telescopic mode along the left-right direction, one end portion of the first rod is fixedly arranged on the sliding part on one side, one end portion of the second rod is rotatably arranged on the sliding part on the other side, a matching structure which is matched with the first rod is arranged between the first rod and the second rod, and the matching structure enables the second rod to stretch and retract relative to the first rod in a sliding mode in the process of rotating around the axis of the second rod.

Furthermore, the linkage device comprises a driving part fixedly arranged on the second rod and a matching part arranged on the rear support, and in the process that the sliding part slides along the rear support, the matching part and the driving part are matched with each other and enable the second rod to rotate around the axis of the second rod.

Furthermore, the matching piece is a rack which is fixedly arranged on the rear bracket and extends along the length direction of the rear bracket; the driving piece is a gear, the gear is fixedly arranged on the second rod and is arranged coaxially with the second rod, and the gear is meshed with the rack.

Furthermore, the gear comprises a shaft sleeve portion and a gear disc portion, the shaft sleeve portion is fixedly sleeved on the end portion of the second rod, the end portion of the second rod or the shaft sleeve portion is connected to the sliding member in a rotating mode around the axis of the second rod, a gear cover is further fixedly arranged on the sliding member, and the gear disc portion is rotatably accommodated in the gear cover.

Furthermore, the sliding part is provided with a sliding sleeve part which is sleeved on the circumferential outer sides of the rack and the rear bracket in a sliding manner.

Further, the second rod can relatively slide and relatively rotate around the axis of the second rod to be arranged in the rod cavity of the first rod in a penetrating mode, the matching structure comprises an internal thread arranged in the rod cavity of the first rod and an external thread arranged on the periphery of the outer side of the second rod, and the internal thread and the external thread are connected in a threaded matching mode.

Furthermore, the second rod comprises a rod body and a threaded pipe, wherein the outer peripheral portion of the threaded pipe is provided with the external threads, and the threaded pipe is fixedly sleeved on the outer peripheral portion of the rod body.

Furthermore, the cross brace component also comprises at least one supporting rod which can stretch out and draw back along the left-right direction, and the supporting rods are arranged between the lower parts of the front brackets on the two sides, between the lower parts of the rear brackets on the two sides and/or between the seat frames on the two sides.

As a preferred embodiment, the cross-brace assembly further includes a cross-brace disposed between the upper portions of the two push rod frames, the cross-brace includes push rod connecting rods respectively rotatably disposed on the upper portions of the two push rod frames, and an upper cross rod rotatably disposed between the two push rod connecting rods, a rotation center line between the push rod connecting rod and the upper cross rod, and a rotation center line of the push rod connecting rod relative to the push rod frames are respectively parallel to a length extending direction of the push rod frames, during a process of converting the frame from an unfolded state to a folded state, the push rod connecting rods on the two sides respectively rotate relative to the push rod frames and the upper cross rod moves forward relative to the push rod frames, and the upper cross rod is provided with an unlocking operation member for unlocking the locking mechanism; and/or the presence of a gas in the gas,

the push rod frame comprises an upper push rod and a lower push rod which are arranged in a relatively sliding and telescopic manner along the length direction, the sliding piece is rotatably arranged at the lower part of the lower push rod, the rear part of the handrail frame is connected with the lower push rod, and the seat frame is rotatably arranged between the front support and the sliding piece; and/or the presence of a gas in the gas,

the upper part of the front bracket, the upper part of the rear bracket and the front part of the armrest frame are rotationally connected around the same rotation center line.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages: the child stroller can be folded transversely and relatively in the folding process, and can be unfolded transversely and relatively in the unfolding process, so that the operation is simple and convenient, and the folded stroller frame is small in size and convenient to store and carry.

Drawings

FIG. 1 is a side view of the stroller of the present invention with the frame in a deployed position;

FIG. 2 is a schematic three-dimensional view of the stroller of the present invention with the frame in an extended position;

FIG. 3 is an exploded view of the stroller of the present invention with the frame in an expanded configuration;

FIG. 4 is a schematic structural view of a cross brace assembly and a linkage assembly of the stroller of the present invention in a frame;

FIG. 5 is an exploded view of the cross brace assembly and linkage assembly of the stroller of the present invention;

FIG. 6 is a schematic side view of the stroller of the present invention during transition from the unfolded position to the folded position;

FIG. 7 is a first three-dimensional schematic view of the stroller of the present invention during the transition from the unfolded position to the folded position;

FIG. 8 is a schematic three-dimensional view of a stroller of the present invention during the transition from the unfolded position to the folded position;

FIG. 9 is a schematic side view of the stroller of the present invention in a process of converting the frame from the unfolded position to the folded position;

FIG. 10 is a schematic three-dimensional view of a stroller of the present invention during the transition from the unfolded position to the folded position;

FIG. 11 is a front view of the stroller of the present invention as the frame transitions from the extended position to the collapsed position;

FIG. 12 is a side elevational view of the stroller of the present invention with the frame in a collapsed position;

FIG. 13 is a three-dimensional schematic view of the stroller of the present invention with the frame in a folded position;

FIG. 14 is a front schematic view of the stroller of the present invention with the frame in a collapsed position;

100, a frame; 200. a front wheel assembly; 300. a rear wheel assembly;

1. a front bracket; 11. a front support rod;

2. a rear bracket; 21. a rear support rod;

3. a push rod frame; 31. a push rod is arranged; 31a, an upper push rod body; 31b, a first connecting seat; 32. a lower push rod; 32a, a lower push rod body; 32b, a second connecting seat;

4. a seat frame; 41. a seat post;

5. a handrail frame; 51. a grab rail;

6. a transverse stay bar; 61. a first lever; 62. a second lever; 62a, a second stick body; 62b, a threaded pipe; 63. a support bar; 64. a third lever; 65. a fourth bar;

7. a cross-brace; 71. a push rod connecting rod; 72. an upper cross bar;

8. a mating structure; 81. an internal thread; 82. an external thread;

9. a linkage device; 91. a gear; 91a, a boss portion; 91b, a fluted disc part; 92. a rack;

a. a first rotational centerline; b. a second center of rotation; c. a third center of rotation; d. a fourth centerline of rotation; e. a fifth center line of rotation; f. a rotation center line between the push rod connecting rod and the upper cross rod; g. the push rod connecting rod is opposite to the rotating center line of the push rod frame; h. the second rod is the axis of the second rod.

Detailed Description

The technical solution of the present invention is further explained with reference to the drawings and the specific embodiments.

The description of the up-down, left-right, front-back, inner-outer, etc. directions herein is defined according to the up-down, left-right, front-back, inner-outer, etc. directions observed by the child seated on the stroller.

A stroller, as shown in fig. 1 to 3, comprises a frame 100 having an unfolded state and a folded state, a front wheel assembly 200 and a rear wheel assembly 300 disposed at the bottom of the frame 100, and a locking mechanism (not shown) for locking the frame 100 in the unfolded state.

The frame 100 includes two side brackets respectively disposed at the left and right sides and a cross brace assembly connected between the two side brackets. The side support comprises a front support 1, a rear support 2, a push rod support 3, a seat support 4 and an armrest support 5, wherein two of the three parts of the upper part of the front support 1, the upper part of the rear support 2 and the front part of the armrest support 5 are rotationally connected, the third part is rotationally connected with one of the two parts, or the three parts of the upper part of the front support 1, the upper part of the rear support 2 and the front part of the armrest support 5 are rotationally connected around the same rotation center line, and the rear part of the armrest support 5 is rotationally arranged on the push rod support 3.

Specifically, when the frame 100 is in the unfolded state, the front bracket 1 includes a front rod 11 extending upward from front to back in an inclined manner, the rear bracket 2 includes a rear rod 21 extending downward from front to back in an inclined manner, the push rod frame 3 extends upward from front to back in an inclined manner, the push rod frame 3 includes an upper push rod 31 and a lower push rod 32 which are telescopically arranged in a sliding manner along the length direction, wherein the upper push rod 31 includes an upper push rod body 31a and a first connecting seat 31b arranged at the lower end of the upper push rod body 31a, the lower push rod 32 includes a lower push rod body 32a and a second connecting seat 32b arranged at the upper end of the lower push rod body 32a, and the first connecting seat 31b is connected with the second connecting seat 32b in a matching manner. The second connecting seat 32b in this embodiment is a sliding sleeve slidably sleeved on the upper rod 31a along the length direction of the upper rod 31 a. The handle frame 5 includes a handle bar 51 extending in the front-rear direction, the upper end portion of the front support bar 11, the upper end portion of the rear support bar 21 and the front end portion of the handle bar 51 are rotatably connected together around a first rotation center line a, and the rear end portion of the handle bar 51 is rotatably provided on the second link base 32b around a second rotation center line b.

The push rod frame 3 is provided with a slider 33 rotatably at a lower portion thereof, the seat frame 4 is rotatably provided between the slider 33 and the front frame 1, specifically, the slider 33 is rotatably provided at a lower end portion of the lower push rod body 32a about a third rotation center line c, and the slider 33 is provided on the rear bar 21 to be relatively slidable in a length extending direction of the rear bar 21. The seat frame 4 includes a seat lever 41 extending in the front-rear direction, a front end portion of the seat lever 41 is rotatably provided on the front stay 11 about a fourth rotation center line d, and a rear end portion of the seat lever 41 is rotatably provided on the slider 21 about a fifth rotation center line e.

In the embodiment, the third rotation center line c is located below the fifth rotation center line e in the length direction of the lower push rod body 32 a; the first rotation center line a, the second rotation center line b, the third rotation center line c, the fourth rotation center line d and the fifth rotation center line e are parallel to each other.

The cross brace assembly can be telescopically arranged between two groups of side brackets along the left-right direction, and particularly, as shown in fig. 1 to 3, the cross brace assembly in the embodiment at least comprises a cross brace 6 extending along the left-right direction and arranged between left and right sliding pieces 33, and a cross brace 7 arranged between the upper parts of two side push rod frames 3. Referring to fig. 4 and 5, the transverse supporting rod 6 includes a first rod 61 and a second rod 62 which are connected in a sliding and telescopic manner along the left-right direction, one end of the first rod 61 is fixedly arranged on the sliding member 33 on one side, one end of the second rod 62 is rotatably arranged on the sliding member 33 on the other side, a matching structure 8 which is matched with the first rod 61 and the second rod 62 is arranged between the first rod 61 and the second rod 62, and the matching structure 8 enables the second rod 62 to slide and stretch relative to the first rod 61 in the process of rotating around the self axis line h. Specifically, the outer end of the first rod 61 is fixedly arranged on the sliding member 33 on one side, the outer end of the second rod 62 is rotatably arranged on the sliding member 33 on the other side, and the second rod 62 is telescopically arranged in the rod cavity of the first rod 61 in a sliding manner. The matching structure 8 includes an internal thread 81 disposed in the rod cavity of the first rod 61 and an external thread 82 disposed on the outer peripheral portion of the second rod 62, the internal thread 81 and the external thread 82 are connected in a thread-matching manner, specifically, in this embodiment, the second rod 62 includes a second rod body 62a and a threaded pipe 62b having an outer peripheral portion provided with the external thread 82, the threaded pipe 62b is fixedly sleeved on the outer peripheral portion of the second rod body 62a, and the threaded pipe 62b and the second rod body 62a are disposed coaxially, which is the axial line h of the second rod 62 itself. During the rotation of the second rod 62 around the axis h, the internal thread 81 slides relatively along the length extension direction of the external thread 82, so that the second rod 62 and the first rod 61 are relatively closed or relatively far away.

Wherein, the cross brace component comprises at least one support rod 63 which can stretch out and draw back along the left-right direction, and the support rods 63 are arranged between the lower parts of the front brackets 1 at the two sides, and/or between the lower parts of the rear brackets 2 at the two sides, and/or between the seat frames 4 at the two sides. The cross brace assembly in this embodiment includes two sets of support rods 63, the two sets of support rods 63 are respectively disposed between the lower portions of the two front support rods 11 and the lower portions of the two rear support rods 21 on the left and right sides, and the support rods 63 include a third rod 64 and a fourth rod 65 slidably and telescopically disposed in a rod cavity of the third rod 64.

Referring to fig. 3, the cross frame 7 includes two push rod connecting rods 71 rotatably disposed at the upper portions of the two push rod frames 3, and an upper cross rod 72 rotatably disposed between the two push rod connecting rods 71, the push rod connecting rods 71 extend in an arc shape from bottom to top when the frame 100 is in the unfolded state, the upper end portions of the push rod connecting rods 71 and the upper cross rod 72 extend along substantially the same length direction, and the cross frame 7 is in a U shape with a downward opening as a whole. The lower end of the push rod link 71 is rotatably connected to the upper end of the upper push rod body 31a about the rotation center line g, and the upper end of the push rod link 71 is rotatably connected to the outer end of the upper cross bar 72 about the rotation center line f. The rotation center line f between the push rod connecting rod 71 and the upper cross rod 72 and the rotation center line g of the push rod connecting rod 71 relative to the push rod frame 3 are respectively parallel to the length extending direction of the push rod frame 3. An unlock operation member 73 for unlocking a lock mechanism (not shown) is further provided at a position intermediate in the left-right direction of the upper cross bar 72.

The frame 100 further comprises a linkage 9, and when the frame 100 is converted between the unfolding state and the folding state, the linkage 9 drives the cross brace assembly to stretch and retract along the left-right direction. The linkage 9 comprises a driving member fixedly arranged on the second rod 62 and a mating member arranged on the rear bracket 2, wherein the mating member and the driving member are mutually matched in the process that the sliding member 33 slides along the rear bracket 2, and the second rod 62 is enabled to rotate around the axis of the second rod. Specifically, in the embodiment, referring to fig. 4 and 5, the mating member is a rack 92, and the rack 92 is fixedly disposed on the rear bracket 2 and extends along the length direction of the rear bracket 2; the driving member is a gear 91, the gear 91 includes a sleeve portion 91a and a toothed disc portion 91b, the sleeve portion 91a is fixedly sleeved on the outer end portion of the second rod 62, the sliding member 33 is further fixedly provided with a gear cover 33a, the outer end portion of the second rod 62 or the sleeve portion 91a is rotatably connected to the sliding member 33 around the axis h of the second rod 62, the toothed disc portion 91b is rotatably received in the gear cover 33a, and the toothed disc portion 91b and the rack 92 are engaged with each other. The slider 33 further has a sliding sleeve portion 33b, and the sliding sleeve portion 33b is slidably fitted over the rack 92 and the outer side of the rear bracket 2 in the circumferential direction.

The front wheel assemblies 200 are provided with two groups, and the two groups of front wheel assemblies 200 are respectively arranged at the bottoms of the front supporting rods 11; the rear wheel assemblies 300 have two sets, and the two sets of rear wheel assemblies 300 are respectively disposed at the bottom of the rear support rod 21.

The expanded and collapsed states of the frame 100 are described in detail below:

when the vehicle body frame 100 is in the unfolded state, as shown in fig. 1 to 3, the front bracket 1 and the rear bracket 2 are opened relative to each other, the front rod 11 extends obliquely upward from front to rear, the rear rod 21 extends obliquely downward from front to rear, the upper push rod 31 extends above the lower push rod 32, the seat rod 41 and the grab rail 51 both extend in the front-rear direction, and the lateral stay 6 extends in the left-right direction.

In the process of converting the frame 100 from the unfolded state to the folded state, referring to fig. 6 to 11, the unlocking operation member 73 is pressed to unlock the frame 100 by the locking mechanism (not shown in the figure), the upper cross bar 72 is pushed forward, the sliding member 33 slides downward along the length extension direction of the rear support bar 21, the seat bar rotates clockwise and downward around the fourth rotation center line d through the transmission of the rotation connection between the sliding member 33 and the seat bar 41, and the front support bar 11 and the rear support bar 21 gradually get closer together in the front-rear direction; synchronously, the downward sliding of the sliding member 33 causes the lower push rod body 32a to rotate counterclockwise and forward around the third rotation center line c, and the lower push rod body 32a and the rear strut 21 gradually and relatively approach each other in the front-rear direction; synchronously, the downward sliding of the sliding part 33 drives the gear disc part 91b to move downward along the length direction of the rack 92, so as to drive the second rod body 62a to relatively rotate around the self axis line h, the external thread 82 slides inward along the extension direction of the internal thread 81, the second rod 62 is gradually folded into the rod cavity of the first rod 61, and the length of the transverse supporting rod 6 is shortened along the left-right direction, so that the left and right groups of side brackets are relatively folded along the left-right direction; the left and right groups of push rod connecting rods 71 rotate forwards around the push rod connecting rods 71 relative to the rotating central line g of the push rod frame 3, and the rotation of the push rod connecting rods 71 drives the upper cross rod 72 to move forwards; the upper cross bar 72 is pushed downward, so that the upper push rod body 31a slides downward along the extension direction of the sleeve of the second connecting seat 32b, and the upper push rod body 31a and the lower push rod body 32a are gradually gathered together. The front wheel assembly 200 and the rear wheel assembly 300 are gradually relatively close together in the front-rear direction.

When the frame 100 is in the folded state, as shown in fig. 12 to 14, the front struts 11 and the rear struts 21 are relatively folded in the front-rear direction, the two sets of front struts 11 are relatively folded in the left-right direction, the two sets of rear struts 21 are relatively folded in the left-right direction, the upper push rod body 31a and the lower push rod body 32a are relatively folded, and the upper cross rod 72 is located in front of the upper push rod body 31 a. The height of the vehicle body frame 100 in the vertical direction and the width of the vehicle body frame 100 in the left-right direction are both significantly reduced as compared to those before folding.

In the process of converting the frame 100 from the folded state to the unfolded state, the upper cross bar 72 is pulled upwards, so that the upper push rod body 31a slides upwards along the extension direction of the sleeve of the second connecting seat 32b, the push rod frame 3 relatively extends along the up-down direction until the first connecting seat 31b is matched and connected with the second connecting seat 32b, the upper cross bar 72 continues to be pulled upwards, the lower push rod body 32a drives the sliding part 33 to slide upwards along the rear supporting rod 21, in the process of sliding the sliding part 33 upwards, the sliding part 33 drives the gear disc part 91b to move upwards along the length direction of the rack 92, the second rod body 62a relatively rotates around the self axial lead h, the external thread 82 slides outwards along the length extension direction of the internal thread 81, the second rod 62 gradually extends outwards from the rod body of the first rod 61, the transverse supporting rod 6 extends along the length direction of the left and right, and the left and right side brackets are relatively far away; in the process that the side brackets are relatively far away, the push rod connecting rods 71 on the two sides respectively rotate backwards around the rotating center line f between the push rod connecting rods 71 and the upper cross rod 72, and the upper cross rod 72 moves backwards through the transmission of the rotating connection part between the push rod connecting rods 71 and the upper cross rod 72. Synchronously, during the upward sliding of the slider 33, the seat lever 41 rotates counterclockwise forward about the fifth rotation center line e, the front link 11 and the rear link 21 relatively move away in the front-rear direction, and correspondingly, the front wheel assembly 200 and the rear wheel assembly 300 gradually move away relatively in the front-rear direction.

In summary, the stroller of the present invention can be linked to fold the frame 100 in the transverse direction during the folding process, and can be linked to unfold the frame 100 in the transverse direction during the unfolding process, so that the operation is simple, and the folded frame 100 has a small volume and is convenient to store and carry.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (10)

1. The utility model provides a children's shallow, includes the frame that has expansion state and fold condition, locates the front wheel subassembly and the rear wheel subassembly of frame bottom, and be used for with the locking mechanical system of frame locking under the expansion state, the frame is including dividing two sets of collateral branch framves, the connection of locating the left and right sides two sets of stull subassembly between the collateral branch frame, its characterized in that: the side brackets comprise a front bracket, a rear bracket, a push rod bracket, a seat bracket and an armrest bracket, wherein two parts of the three parts of the upper part of the front bracket, the upper part of the rear bracket and the front part of the armrest bracket are rotationally connected and the third part is rotationally connected with one part of the two parts, or the three parts of the upper part of the front bracket, the upper part of the rear bracket and the front part of the armrest bracket are rotationally connected around the same rotation center line,

the rear portion of handrail frame sets up with rotating on the push rod frame, the lower part of push rod frame is provided with the slider with rotating, the slider is followed the length extending direction of after-poppet locates with sliding relatively on the after-poppet, a tip of seat frame is connected with rotating on the fore-stock, another tip of seat frame is connected with rotating on the slider or on the push rod frame, the stull subassembly can be followed left right direction and set up two sets of telescopically between the collateral branch frame, the frame still includes aggregate unit, the frame is when switching between expansion state and fold condition, aggregate unit orders about the stull subassembly is followed left right direction and is stretched out and drawn back.

2. The stroller of claim 1, wherein: the wale assembly at least includes:

the transverse supporting rod extends along the left-right direction and is arranged between the sliding parts on the left side and the right side, the transverse supporting rod comprises a first rod and a second rod which are connected in a sliding and telescopic mode along the left-right direction, one end portion of the first rod is fixedly arranged on the sliding part on one side, one end portion of the second rod is rotatably arranged on the sliding part on the other side, a matching structure which is matched with the first rod is arranged between the first rod and the second rod, and the matching structure enables the second rod to stretch and retract relative to the first rod in a sliding mode in the process of rotating around the axis of the second rod.

3. The stroller of claim 2, wherein: the linkage device comprises a driving piece fixedly arranged on the second rod and a matching piece arranged on the rear support, and in the process that the sliding piece slides along the rear support, the matching piece and the driving piece are matched with each other and enable the second rod to rotate around the axis of the second rod.

4. The stroller of claim 3, wherein: the matching piece is a rack which is fixedly arranged on the rear bracket and extends along the length direction of the rear bracket; the driving piece is a gear, the gear is fixedly arranged on the second rod and is arranged coaxially with the second rod, and the gear is meshed with the rack.

5. The stroller of claim 4, wherein: the gear comprises a shaft sleeve portion and a gear disc portion, the shaft sleeve portion is fixedly sleeved on the end portion of the second rod, the end portion of the second rod or the shaft sleeve portion is connected to the sliding piece in a rotating mode around the axis of the second rod, a gear cover is further fixedly arranged on the sliding piece, and the gear disc portion is rotatably contained in the gear cover.

6. The stroller of claim 4, wherein: the sliding part is provided with a sliding sleeve part which is sleeved on the circumferential outer sides of the rack and the rear bracket in a sliding manner.

7. The stroller of claim 2, wherein: the second rod can relatively slide and relatively rotate around the axis of the second rod to be arranged in the rod cavity of the first rod in a penetrating mode, the matching structure comprises an internal thread arranged in the rod cavity of the first rod and an external thread arranged on the periphery of the outer side of the second rod, and the internal thread and the external thread are connected in a threaded matching mode.

8. The stroller of claim 7, wherein: the second rod comprises a rod body and a threaded pipe, wherein the outer side periphery of the threaded pipe is provided with the external threads, and the threaded pipe is fixedly sleeved on the outer side periphery of the rod body.

9. The stroller of claim 2, wherein: the cross brace component also comprises at least one supporting rod which can stretch out and draw back along the left-right direction, and the supporting rods are arranged between the lower parts of the front supports on two sides, between the lower parts of the rear supports on two sides and/or between the seat frames on two sides.

10. Child stroller according to any of claims 1 to 9, characterized in that:

the cross-brace assembly further comprises cross-braces arranged between the upper parts of the push rod frames on the two sides, each cross-brace comprises push rod connecting rods which are respectively and rotatably arranged on the upper parts of the two groups of push rod frames, and an upper cross rod which is rotatably arranged between the two groups of push rod connecting rods, a rotating central line between each push rod connecting rod and the corresponding upper cross rod and a rotating central line of each push rod connecting rod relative to the corresponding push rod frame are respectively parallel to the length extending direction of the corresponding push rod frame, in the process of converting the frame from the unfolded state to the folded state, the push rod connecting rods on the two sides respectively rotate relative to the corresponding push rod frames, the upper cross rods move forwards relative to the corresponding push rod frames, and the upper cross rods are provided with unlocking operation pieces for unlocking the locking mechanisms; and/or the presence of a gas in the gas,

the push rod frame comprises an upper push rod and a lower push rod which are arranged in a relatively sliding and telescopic manner along the length direction, the sliding piece is rotatably arranged at the lower part of the lower push rod, the rear part of the handrail frame is connected with the lower push rod, and the seat frame is rotatably arranged between the front support and the sliding piece; and/or the presence of a gas in the gas,

the upper part of the front bracket, the upper part of the rear bracket and the front part of the armrest frame are rotationally connected around the same rotation center line.

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