CN118082952A - Strollers - Google Patents

Abstract

The invention discloses a child stroller, which comprises a stroller frame, wherein the stroller frame comprises a side bracket and a cross brace bracket, the side bracket comprises a front bracket, a rear bracket, a push rod assembly and a side handrail, the front wheel assembly is rotationally arranged on the front bracket through a first wheel shaft, the rear wheel assembly is rotationally arranged on the rear bracket through a second wheel shaft, the front bracket is rotationally connected with the rear bracket, and the side handrail is rotationally connected with at least one of the front bracket and the rear bracket and the push rod assembly; the included angle between the whole extending direction of the front bracket and the horizontal plane is smaller than the included angle between the whole extending direction of the side handrail and the horizontal plane; the baby carriage can be folded once, and when the baby carriage is folded once, the side armrests are turned downwards to be close to the rear support, and the front support is turned backwards to be close to the rear support. The folding baby stroller has compact structure and small volume.

Description

Strollers

This invention application is a divisional application of the parent application “A child stroller”. The application date of the parent application is August 29, 2017, and the application number of the parent application is 201710753536.4.

Technical Field

The present invention relates to the technical field of children's products, and in particular to a children's stroller.

Background technique

A child stroller in the prior art includes a stroller frame having an unfolded position and a folded position, a front wheel assembly and a rear wheel assembly disposed at the bottom of the stroller frame, and a locking mechanism for locking the stroller frame in the unfolded state. There are many types of existing child strollers, and the number of stroller frame rods is different, and the connection positions between the rods are different, so the folding principles and folding methods are different, and the effects after folding are also different.

Summary of the invention

The object of the present invention is to provide a foldable baby stroller with a smaller volume after folding, in view of the deficiencies in the prior art.

To achieve the above object, the technical solution adopted by the present invention is:

A stroller for children, comprising a stroller frame with an unfolded state and a folded state, a front wheel assembly arranged at a lower front portion of the stroller frame, a rear wheel assembly arranged at a lower rear portion of the stroller frame, and a locking mechanism for locking the stroller frame in the unfolded state, the stroller frame comprising side brackets respectively located on left and right sides, a cross brace bracket connected between the side brackets on the left and right sides, the side brackets on each side comprising a front bracket, a rear bracket, a push rod assembly, a side handrail, a front connecting rod and a rear connecting rod, the front wheel assembly being rotatably arranged at the lower portion of the front bracket via a first wheel axle, the rear wheel assembly being rotatably arranged at the lower portion of the rear bracket via a second wheel axle, the upper portion of the front bracket being rotatably connected to the upper portion of the rear bracket, the lower portion of the side handrail being rotatably connected to at least one of the upper portion of the front bracket and the upper portion of the rear bracket, and the upper portion of the side handrail being rotatably connected to the lower portion of the push rod assembly The front wheel assembly and the rear wheel assembly are connected in a folded state, and the front wheel assembly and the rear wheel assembly are connected in a folded state.

Preferably, when the child stroller is in a once-folded state, the first wheel axle and the second wheel axle extend along the same straight line direction.

Preferably, when the child stroller is in a single-folded state, the front wheel assembly and the rear wheel assembly on each side are respectively located at inner and outer sides of the side bracket on the same side.

Furthermore, the upper portion of the front support is rotatably connected to the upper portion of the rear support via a first side shaft, and when the stroller is in an unfolded state, the rear wheel assemblies on the left and right sides are rotatably connected to the outer sides of the rear support, respectively, and on each side of the left and right sides, the front wheel assemblies are located on the inner side of the first side shaft, and the rear wheel assemblies are located on the outer side of the first side shaft.

Furthermore, the upper portion of the front bracket is rotatably connected to the upper portion of the rear bracket via a first side shaft, and when the stroller is in an unfolded state, the rear wheel assemblies on the left and right sides are rotatably connected to the inner sides of the rear bracket respectively, and on each side of the left and right sides, the front wheel assemblies are located on the outer sides of the first side shaft, and the rear wheel assemblies are located on the inner sides of the first side shaft.

Preferably, when the baby stroller is in the single-folded state, the distance between the lower one of the first wheel axle and the second wheel axle and the upper end surface of the push rod assembly is 230-330 mm.

Preferably, the stroller can also be folded twice. When the stroller is in the secondary folded state, the front wheel assemblies and the rear wheel assemblies on both sides are arranged side by side in the front-to-back direction, and on each side of the stroller, one of the first wheel axle and the second wheel axle located on the inner side is located within the outline of one of the front wheel assembly and the rear wheel assembly located on the outer side.

Furthermore, the cross brace bracket comprises:

A first crossbar, the first crossbar extends in the left-right direction, and the left and right ends of the first crossbar are rotatably connected to the left and right front brackets respectively through a first cross shaft;

A second crossbar, the second crossbar extending in the left-right direction, and the left and right ends of the second crossbar are respectively rotatably connected to the rear brackets on the left and right sides through a second transverse axis;

A third crossbar, the third crossbar extending in the left-right direction, the left and right ends of the third crossbar being rotatably connected to the push rod assemblies on the left and right sides respectively through a third cross shaft;

When the baby stroller is folded for the second time, the side brackets on both sides are respectively turned around the first transverse axis, the second transverse axis and the third transverse axis toward the inner side of the baby stroller.

Furthermore, when the child stroller is in the secondary folding state, the first transverse axis, the second transverse axis and the third transverse axis located on each of the left and right sides of the stroller frame all extend in the same straight line direction.

Preferably, the push rod assembly includes a lower push rod and an upper push rod slidably arranged on the lower push rod along the length extension direction of the lower push rod, and the upper part of the side armrest and one end of the rear connecting rod are respectively rotatably connected to the lower part of the lower push rod.

Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the child stroller of the present invention has a simple structure, can be folded, and the folding operation is convenient. The folded child stroller has a compact structure and a small size, and is easy to carry and store.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a baby stroller of the present invention in an unfolded state (Example 1);

FIG2 is a second perspective view of the baby stroller of the present invention in the unfolded state (Example 1);

FIG3 is a side view of the child stroller of the present invention in the unfolded state (Example 1);

FIG. 4 is a perspective view of the baby stroller of the present invention during folding (Example 1);

FIG. 5 is a second perspective view of the child stroller of the present invention during the folding process (Example 1);

FIG. 6 is a perspective view of the child stroller of the present invention in a folded state (Example 1)

FIG. 7 is a side view of the baby stroller of the present invention in a folded state (Example 1);

FIG8 is a perspective view of the child stroller of the present invention in an unfolded state (Example 2);

FIG. 9 is a perspective view of the child stroller of the present invention during folding (Example 2);

FIG. 10 is a perspective view of the child stroller of the present invention in a folded state (Example 2)

FIG. 11 is a side view of the baby stroller of the present invention in a folded state (Example 2).

Among them: 1, side bracket; 11, front bracket; 12, rear bracket; 13, push rod assembly; 131, lower push rod; 132, upper push rod; 133, first rod; 134, second rod; 14, side armrest; 15, front connecting rod; 16, rear connecting rod; 21, front wheel assembly; 22, rear wheel assembly; 31, first wheel axle; 32, second wheel axle; 41, first side axis; 42, second side axis; 43, third side axis; 44, fourth side axis; 45, fifth side axis; 46, sixth side axis; 47, seventh side axis; 51, first straight line; 52, second straight line; 61, first cross bar; 62, second cross bar; 63, third cross bar; 64, fourth cross bar; 71, first cross axis; 72, second cross axis; 73, third cross axis; 74, fourth cross axis.

Detailed ways

The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in FIGS. 1 to 7 , the child stroller of the present invention includes a stroller frame having an unfolded state and a folded state, a front wheel assembly 21 disposed at the bottom front portion of the stroller frame, a rear wheel assembly 22 disposed at the bottom rear portion of the stroller frame, and a locking mechanism for locking the stroller frame in the unfolded state.

The stroller frame comprises side brackets 1 respectively located on the left and right sides of the stroller and a cross-bracing bracket connected between the side brackets 1 on the left and right sides.

The side bracket 1 on each side includes a front bracket 11, a rear bracket 12, a push rod assembly 13, a side armrest 14, a front connecting rod 15 and a rear connecting rod 16. The front wheel assembly 21 is rotatably connected to the lower part of the front bracket 11 through a first wheel axle 31, and the rear wheel assembly 22 is rotatably connected to the lower part of the rear bracket 12 through a second wheel axle 32. When the cart frame is in the unfolded state, the front bracket 11, the side armrest 14 and the push rod assembly 13 are all tilted upward from front to rear, and the rear bracket 12 is tilted upward from rear to front.

The upper part of the front bracket 11 is rotatably connected to the upper part of the rear bracket 12 via the first side shaft 41, and the lower part of the side armrest 14 is rotatably connected to at least one of the upper part of the front bracket 11 and the upper part of the rear bracket 12 via the second side shaft 42. In a specific embodiment, the lower part of the side armrest 14 is rotatably connected to the upper part of the rear bracket 12 via the second side shaft 42, as shown in FIG2; in another specific embodiment, the first side shaft 41 and the second side shaft 42 extend in the same straight line direction, that is, the upper part of the front bracket 11, the upper part of the rear bracket 12 and the lower part of the side armrest 14 are rotatably connected to the same axis via the first side shaft 41/the second side shaft 42, as shown in FIG1. The upper part of the side armrest 14 is rotatably connected to the lower part of the push rod assembly 13 through the third side shaft 43, one end of the rear link 16 is rotatably connected to the lower part of the push rod assembly 13 through the fourth side shaft 44, the other end of the rear link 16 is rotatably connected to one end of the front link 15 through the fifth side shaft 45, the rear link 16 is rotatably connected to the rear bracket 12 through the sixth side shaft 46, and the other end of the front link 15 is rotatably connected to the front bracket 11 through the seventh side shaft 47. In this way, a four-bar linkage is formed between the front bracket 11, the rear bracket 12, the rear link 16 and the front link 15, and a four-bar linkage is also formed between the push rod assembly 13, the side armrest 14, the rear bracket 12 and the rear link 16.

In order to make the stroller smaller in size after being folded, the push rod assembly 13 includes a lower push rod 131 extending obliquely upward from front to rear, and an upper push rod 132 slidably arranged on the lower push rod 131 along the length extension direction of the lower push rod 131. The upper part of the side armrest 14 is rotatably connected to the lower part of the lower push rod 131 via a third side shaft 43, and one end of the rear connecting rod 16 is rotatably connected to the lower part of the lower push rod 131 via a fourth side shaft 44.

In a specific embodiment, the lower push rod 131 has a hollow cavity extending along its length direction, the upper push rod 132 is inserted into the hollow cavity of the lower push rod 131 from the upper part of the lower push rod 131, and the upper push rod 132 can slide up and down along the length extension direction of the hollow cavity.

The push rod assembly 13 further includes a push handle, which includes a first rod 133 and a second rod 134 that are fixedly connected to each other. The first rod 133 is fixedly connected to the upper end of the upper push rod 132 .

When the side bracket 1 is in the unfolded state, on the front bracket 11, the seventh side shaft 47 is located below the first side shaft 41; on the rear bracket 12, the first side shaft 41 is located below the second side shaft 42, or the first side shaft 41 and the second side shaft 42 are coaxially arranged, and the sixth side shaft 46 is located below the first side shaft 41; on the push rod assembly 13, the fourth side shaft 44 is located below the third side shaft 43.

When the side bracket 1 is in the unfolded state, as shown in FIG3 , a first straight line 51 is formed between the axis lines of the first wheel axle 31 and the first side axle 41, and a second straight line 52 is formed between the axis lines of the second wheel axle 32 and the first side axle 41. When the child stroller is in the unfolded state, the angle between the first straight line 51 and the second straight line 52 is set to 95 to 150 degrees, and the distance between the axis lines of the first wheel axle 31 and the second wheel axle 32 is set to 400 to 500 mm. In order to make the child stroller smaller and more compact after folding, the angle between the first straight line 51 and the second straight line 52 is preferably 105 to 130 degrees.

The stroller can be folded once. When folded once, the side frame 1 on each side is folded in the height direction and the front-to-back direction. In the once-folded state, the front wheel assemblies 21 and the rear wheel assemblies 22 on both sides are arranged side by side in the left-right direction. On each side of the left and right sides of the stroller, the inner one of the first wheel axle 31 and the second wheel axle 32 is located within the contour of the outer one of the front wheel assembly 21 and the rear wheel assembly 22. Preferably, when the stroller is in the once-folded state, the front wheel assembly 21 and the rear wheel assembly 22 on each side are respectively located on the inner and outer sides of the side frame 1 on the same side, and the first wheel axle 31 and the second wheel axle 32 extend in the same straight direction.

In this embodiment, when the stroller is in the unfolded state, the rear wheel assemblies 22 on the left and right sides are respectively rotatably connected to the outside of the rear frame 12, and on each side of the left and right sides, the front wheel assembly 21 is located on the inside of the first side shaft 41, and the rear wheel assembly 22 is located on the outside of the first side shaft 41. In this way, when the stroller is in the once folded state, the front wheel assembly 21 is located on the inside of the side frame 1, and the rear wheel assembly 22 is located on the outside of the side frame 1.

The child stroller can also be folded twice. Specifically, the cross brace includes a first cross bar 61, a second cross bar 62 and a third cross bar 63 connected between the side brackets 1 on the left and right sides. The first cross bar 61, the second cross bar 62 and the third cross bar 63 all extend in the left-right direction. The left and right ends of the first cross bar 61 are respectively rotatably connected to the front brackets 11 on the left and right sides through the first cross shaft 71, the left and right ends of the second cross bar 62 are respectively rotatably connected to the rear brackets 12 on the left and right sides through the second cross shaft 72, and the left and right ends of the third cross bar 63 are respectively rotatably connected to the first rods 133 on the left and right sides through the third cross shaft 73. In order to make the stroller frame more stable in the unfolded position, it is preferred that the cross brace also includes a fourth cross bar 64, which extends in the left-right direction, and the left and right ends of the fourth cross bar 64 are respectively rotatably connected to the rear connecting rods 16 on the left and right sides through the fourth cross shaft 74. A one-way rotation limiting mechanism is provided between the first crossbar 61 and the front brackets 11 on the left and right sides, between the second crossbar 62 and the rear brackets 12 on the left and right sides, between the third crossbar 63 and the first rods 133 on the left and right sides, and between the fourth crossbar 64 and the rear connecting rods 16 on the left and right sides. The one-way rotation limiting mechanism can make the side brackets 1 on the left and right sides rotate in one direction only, but not in another direction. In this embodiment, when the child stroller is folded for the second time, the side brackets 1 on both sides can be turned and folded around the first transverse axis 71, the second transverse axis 72, the third transverse axis 73 and the fourth transverse axis 74 to the inner side of the child stroller, so that the volume of the child stroller after folding is smaller. When the child stroller is in the second folding state, the front wheel assemblies 21 and the rear wheel assemblies 22 on both sides are arranged side by side in the front-to-back direction, and on each side of the child stroller, one of the first wheel axle 31 and the second wheel axle 32 located on the inner side is located within the outline of one of the front wheel assembly 21 and the rear wheel assembly 22 located on the outer side.

The specific structure of each of the one-way rotation limiting mechanisms is not the key point of the present invention, and the structure in the prior art can be adopted.

The locking mechanism includes a first locking mechanism arranged between the upper push rod 132 and the lower push rod 131 and a second locking mechanism arranged between any two parts connected in rotation in the above-mentioned two four-bar linkages. The first locking mechanism and the second locking mechanism can be unlocked separately, or after the first locking mechanism is unlocked, the upper push rod 132 slides downward relative to the lower push rod 131 to trigger the second locking mechanism to unlock the second locking mechanism. The specific structures of the first locking mechanism and the second locking mechanism are not the technical points to be protected by this patent, and both can adopt the structures in the prior art.

When the stroller is in the unfolded state, the first locking mechanism and the second locking mechanism are both in the locked state, an angle between 95 and 150 degrees is formed between the first straight line 51 and the second straight line 52, the distance between the axis connecting the first axle 31 and the second axle 32 is maintained at 400 to 500 mm, and the first rod 133 and the third cross bar 63 extend in the same straight line direction, as shown in Figures 1 to 3.

When the stroller is folded, it is folded once. During the folding, the first locking mechanism is unlocked first, and the upper push rod 132 slides downward along the length extension direction of the lower push rod 131 for a distance, and then the second locking mechanism is unlocked, and then the push rod assembly 13 is flipped forward, so that the side armrest 14 flips downward around the second side axis 42 and approaches the rear bracket 12, and the front bracket 11 is driven to flip backward around the first side axis 41 and approaches the rear bracket 12 through the front connecting rod 15 and the rear connecting rod 16, until the rods constituting the side bracket 1 are closely together, and The front wheel assemblies 21 on the left and right sides are respectively accommodated in the inner side of the side bracket 1 on each side, and the rear wheel assemblies 22 are respectively located on the outer side of the side bracket 1 on each side. Preferably, the first wheel axle 31 and the second wheel axle 32 extend in the same straight line direction, and a folding is completed. The folded structure is shown in Figure 5. At this time, the first rod 133 and the third cross bar 63 still extend in the same straight line direction, and the distance between the lower one of the first wheel axle 31 and the second wheel axle 32 and the upper end surface of the push rod assembly 13 is 230 to 330 mm. Then, a secondary folding is performed. During the secondary folding, the side brackets 1 on both sides are turned and folded toward the inner side of the child stroller around the first transverse axis 71, the second transverse axis 72, the third transverse axis 73 and the fourth transverse axis 74 respectively. The final folding is shown in Figures 6 and 7. At this time, the front wheel assembly 21 is located at the rear side of the side bracket 1, the rear wheel assembly 22 is located at the front side of the side bracket 1, the first transverse axis 71, the second transverse axis 72, the third transverse axis 73 and the fourth transverse axis 74 extend in the same straight line direction, the first rod 133 is perpendicular to the third transverse rod 63, and the distance between the lower one of the first wheel shaft 31 and the second wheel shaft 32 and the upper end surface of the push rod assembly 13 is the same as that after the primary folding. The child stroller has a compact structure after folding, a small volume, and is easy to carry and store.

Example 2

As shown in Figures 8 to 11, in this embodiment, the rear wheel assemblies 22 on the left and right sides are respectively rotatably connected to the inner side of the rear bracket 12, and on each side of the left and right sides, the front wheel assembly 21 is located on the outer side of the first side shaft 41, and the rear wheel assembly 22 is located on the inner side of the first side shaft 41.

In this way, after the stroller is folded once, the front wheel assemblies 21 on the left and right sides are respectively accommodated on the outside of the side frame 1 on each side, and the rear wheel assemblies 22 are respectively located on the inside of the side frame 1 on each side, as shown in Figure 9. After the stroller is folded twice, the front wheel assembly 21 is located on the front side of the side frame 1, and the rear wheel assembly 22 is located on the rear side of the side frame 1, as shown in Figure 10. Except for this difference, the rest is the same as Example 1.

Example 3

In this embodiment, the cross brace bracket includes a first cross bar 61, a second cross bar 62 and a third cross bar 63, the first cross bar 61, the second cross bar 62 and the third cross bar 63 all extend in the left-right direction, the first cross bar 61 is connected between the front brackets 11 on the left and right sides, the second cross bar 62 is connected between the rear brackets 12 on the left and right sides, the third cross bar 63 is connected between the first rods 133 on the left and right sides, and the first cross bar 61, the second cross bar 62 and the third cross bar 63 are all telescopic rods that can be telescopically extended in the left-right direction. In order to make the cart frame more stable in the unfolded position, it is preferred that the cross brace bracket also includes a fourth cross bar 64, the fourth cross bar 64 extends in the left-right direction, the fourth cross bar 64 is connected between the rear connecting rods 16 on the left and right sides, and the fourth cross bar 64 is also a telescopic rod that can be telescopically extended in the left-right direction. The rest is the same as in Example 1. In this way, when the child stroller is folded for the second time, the side supports 1 on the left and right sides are pushed toward the inside of the child stroller respectively, and the first cross bar 61, the second cross bar 62, the third cross bar 63 and the fourth cross bar 64 are contracted to bring the side supports 1 on both sides closer together, thereby realizing the lateral folding of the child stroller. In this folded state, the front wheel assemblies 2 on the left and right sides are respectively accommodated on the inner side of the side support 1 on each side, and the rear wheel assemblies 22 are respectively located on the outer side of the side support 1 on each side.

Example 4

In this embodiment, the cross brace bracket includes a first cross bar 61, a second cross bar 62 and a third cross bar 63, the first cross bar 61, the second cross bar 62 and the third cross bar 63 all extend in the left-right direction, the first cross bar 61 is connected between the front brackets 11 on the left and right sides, the second cross bar 62 is connected between the rear brackets 12 on the left and right sides, the third cross bar 63 is connected between the first rods 133 on the left and right sides, and the first cross bar 61, the second cross bar 62 and the third cross bar 63 are all telescopic rods that can be telescopically extended in the left-right direction. In order to make the cart frame more stable in the unfolded position, it is preferred that the cross brace bracket also includes a fourth cross bar 64, the fourth cross bar 64 extends in the left-right direction, the fourth cross bar 64 is connected between the rear connecting rods 16 on the left and right sides, and the fourth cross bar 64 is also a telescopic rod that can be telescopically extended in the left-right direction. The rest is the same as in Example 2. In this way, when the stroller is folded for the second time, the side supports 1 on the left and right sides are pushed toward the inside of the stroller respectively, and the first cross bar 61, the second cross bar 62, the third cross bar 63 and the fourth cross bar 64 are contracted to bring the side supports 1 on both sides closer together, thereby realizing the lateral folding of the stroller. In this folded state, the front wheel assemblies 2 on the left and right sides are respectively accommodated on the outside of the side supports 1 on each side, and the rear wheel assemblies 22 are respectively located on the inside of the side supports 1 on each side.

The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A child stroller, comprising a stroller frame having an unfolded state and a folded state, a front wheel assembly arranged at a lower front portion of the stroller frame, a rear wheel assembly arranged at a lower rear portion of the stroller frame, and a locking mechanism for locking the stroller frame in the unfolded state, characterized in that: The cart frame includes side brackets located on the left and right sides respectively, and a cross brace bracket connected between the side brackets on the left and right sides, and the side brackets on each side include a front bracket, a rear bracket, a push rod assembly and a side handrail; The front wheel assembly is rotatably disposed at the lower portion of the front bracket via a first wheel axle, and the rear wheel assembly is rotatably disposed at the lower portion of the rear bracket via a second wheel axle; The upper portion of the front bracket is rotatably connected to the upper portion of the rear bracket, the lower portion of the side armrest is rotatably connected to at least one of the upper portion of the front bracket and the upper portion of the rear bracket, and the upper portion of the side armrest is rotatably connected to the lower portion of the push rod assembly; The angle between the overall extension direction of the front bracket and the horizontal plane is smaller than the angle between the overall extension direction of the side armrest and the horizontal plane; The baby stroller can be folded once. When the baby stroller is folded once, the side armrests are flipped downwards and brought close to the rear support, and the front support is flipped backwards and brought close to the rear support. 2. The stroller according to claim 1, characterized in that: the upper part of the front bracket is rotatably connected to the upper part of the rear bracket through a first side shaft, and the lower part of the side armrest is rotatably connected to at least one of the upper part of the front bracket and the upper part of the rear bracket through a second side shaft; the push rod assembly includes a lower push rod, an upper push rod slidably arranged on the lower push rod along the length extension direction of the lower push rod, and the upper part of the side armrest is rotatably connected to the lower part of the lower push rod through a third side shaft; During one folding, the upper push rod slides downward along the length extension direction of the lower push rod, and then the push rod assembly is flipped forward, so that the side armrest flips downward around the second side axis and moves closer to the rear bracket, the push rod assembly moves closer to the side armrest, and the front bracket flips backward around the first side axis and moves closer to the rear bracket. 3. The stroller according to claim 2, characterized in that: after one folding, the distance between the lower one of the first wheel axle and the second wheel axle and the upper end surface of the push rod assembly is 230 to 330 mm. 4. The stroller according to claim 2, characterized in that: the side bracket on each side further comprises a front link and a rear link; one end of the rear link is rotatably connected to the lower portion of the push rod assembly, the other end of the rear link is rotatably connected to one end of the front link, the rear link is rotatably connected to the rear bracket, and the other end of the front link is rotatably connected to the front bracket; The push rod assembly flips forward to drive the side armrest to flip downward and move closer to the rear bracket, and drives the front bracket to flip backward and move closer to the rear bracket through the front connecting rod and the rear connecting rod. 5. The stroller according to claim 1 is characterized in that: the upper part of the front bracket is rotatably connected to the upper part of the rear bracket through a first side shaft, and the lower part of the side armrest is rotatably connected to at least one of the upper part of the front bracket and the upper part of the rear bracket through a second side shaft; a first straight line is formed between the first wheel axle and the axis line of the first side shaft, and a second straight line is formed between the second wheel axle and the axis line of the first side shaft, and when the stroller is in an unfolded state, the angle between the first straight line and the second straight line is set to 95 to 150 degrees. 6. The stroller according to claim 1, characterized in that when the stroller is in an unfolded state, the distance between the axis connecting the first wheel axle and the second wheel axle is set to 400-500 mm. 7. The stroller according to claim 1, characterized in that: when the stroller is in a once-folded state, the front wheel assemblies and the rear wheel assemblies on both sides are arranged side by side in the left-right direction, and on each side of the left and right sides of the stroller, one of the first wheel axle and the second wheel axle located on the inner side is located within the outline of one of the front wheel assembly and the rear wheel assembly located on the outer side; Alternatively, when the stroller is in a once-folded state, the first wheel axle and the second wheel axle extend in the same straight line direction; Alternatively, when the baby stroller is in a single folding state, the front wheel assembly and the rear wheel assembly on each side are respectively located at the inner and outer sides of the side bracket on the same side. 8. The stroller according to claim 1, characterized in that: the upper portion of the front frame and the upper portion of the rear frame are rotatably connected via a first side shaft, and when the stroller is in an unfolded state, the rear wheel assemblies on the left and right sides are rotatably connected to the outer side of the rear frame respectively, and on each side of the left and right sides, the front wheel assemblies are located on the inner side of the first side shaft, and the rear wheel assemblies are located on the outer side of the first side shaft; Alternatively, the upper portion of the front support is rotatably connected to the upper portion of the rear support via a first side shaft, and when the stroller is in an unfolded state, the rear wheel assemblies on the left and right sides are rotatably connected to the inner sides of the rear support respectively, and on each side of the left and right sides, the front wheel assemblies are located on the outer sides of the first side shaft, and the rear wheel assemblies are located on the inner sides of the first side shaft. 9. The stroller according to any one of claims 1 to 8, characterized in that: the stroller can also be folded twice, and when the stroller is in the secondary folded state, the front wheel assemblies and the rear wheel assemblies on both sides are arranged side by side in the front-to-back direction, and on each side of the stroller, the inner one of the first wheel axle and the second wheel axle is located within the outline of the outer one of the front wheel assembly and the rear wheel assembly. 10. The baby stroller according to claim 9, wherein the cross brace comprises: A first crossbar, the first crossbar extends in the left-right direction, and the left and right ends of the first crossbar are respectively rotatably connected to the left and right front brackets through a first transverse axis; A second crossbar, the second crossbar extending in the left-right direction, and the left and right ends of the second crossbar are respectively rotatably connected to the rear brackets on the left and right sides through a second transverse axis; A third crossbar, the third crossbar extending in the left-right direction, the left and right ends of the third crossbar being rotatably connected to the push rod assemblies on the left and right sides respectively through a third cross shaft; When the stroller is folded for the second time, the side brackets on both sides are respectively turned around the first transverse axis, the second transverse axis and the third transverse axis toward the inside of the stroller; When the child stroller is in the secondary folding state, the first transverse axis, the second transverse axis and the third transverse axis located on each of the left and right sides of the stroller frame all extend in the same straight line direction.