CN114750818A

CN114750818A - Children's trailer

Info

Publication number: CN114750818A
Application number: CN202210270995.8A
Authority: CN
Inventors: 张兴荣; 石平中
Original assignee: Goodbaby Child Products Co Ltd
Current assignee: Goodbaby Child Products Co Ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-07-15
Anticipated expiration: 2042-03-18
Also published as: CN114750818B

Abstract

The invention discloses a children trailer which has an unfolding state and a folding state, the children trailer comprises a frame and a plurality of groups of wheel assemblies arranged at the bottom of the frame, each group of wheel assemblies comprises a wheel carrier and a wheel body which is rotationally arranged at the bottom of the wheel carrier around a wheel shaft, the wheel carrier is rotationally connected to the frame, a linkage mechanism for linking the wheel assemblies to overturn is arranged between the frame and the wheel body, the linkage mechanism at least comprises a linkage rod, one end part of the linkage rod is universally rotationally connected with the frame, the other end part of the linkage rod is universally rotationally connected with the wheel carrier, in the process of converting the unfolding state of the children trailer to the folding state, the linkage mechanism drives the wheel assemblies to overturn up and down relative to the frame and fold in the frame, and the overall size of the children trailer after being folded is greatly reduced, the convenience is provided for daily storage and carrying of the user.

Description

Children's trailer

Technical Field

The invention relates to the field of children products, in particular to a children trailer.

Background

For reducing the storage space after folding so that accomodate and carry the transportation, current children's trailer is mostly set up to the structure that can fold. The existing children trailer generally comprises a foldable main frame, a front wheel assembly arranged at the front part of the bottom of the main frame, a rear wheel assembly arranged at the rear part of the bottom of the main frame and a towing rod capable of being dragged to operate.

Disclosure of Invention

It is an object of the present invention to provide a new child's trailer that solves one or more of the problems of the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a children's trailer, has expansion state and fold condition, children's trailer includes the frame, locates the multiunit wheel subassembly of frame bottom, every group the wheel subassembly all includes the wheel carrier and sets up around the shaft rotation ground the wheel body of wheel carrier bottom, the wheel carrier connect with rotating on the frame, the frame with be provided with between the wheel body and be used for the linkage the link gear of wheel subassembly upset, the link gear includes the gangbar at least, a tip of gangbar with the frame is connected with universal rotation ground, another tip of gangbar with the wheel carrier is connected with universal rotation ground, children's trailer is by the in-process of expansion state to fold condition conversion, link gear orders about the wheel subassembly is relative the frame along the upset of upper and lower direction and draw in the frame.

Preferably, the child trailer is in a deployed state, and the wheel axle extends in a left-right direction; when the child trailer is in a folded state, the wheel axle extends in a fore-and-aft direction.

Preferably, the plurality of sets of wheel assemblies include two sets of front wheel assemblies arranged on the left and right sides of the front portion of the frame bottom and two sets of rear wheel assemblies arranged on the left and right sides of the rear portion of the frame bottom, when the child trailer is in a folded state, the two sets of front wheel assemblies are arranged side by side in the left-right direction, the two sets of rear wheel assemblies are arranged side by side in the left-right direction, and the front wheel assemblies and the rear wheel assemblies on the same side of the frame are arranged in an overlapped manner in the front-back direction.

Preferably, all be provided with the connector on two tip on the gangbar length direction, the both ends of gangbar pass through respectively the connector with the wheel carrier reaches the frame is connected with universal rotation, wherein, the connector is the ball joint spare.

Preferably, the wheel carrier is rotatably connected with the frame around a rotation center line, and the rotation center line extends along the front-back direction when the children trailer is in the unfolding state; the child trailer is in a folded state, and the rotation center line extends from top to bottom.

Preferably, the frame encloses the frame including two sets of sides that both sides just all extend along upper and lower direction around locating separately, set up with rotating two sets ofly enclose the frame on between the side frame upper portion, and set up with rotating two sets of enclose the frame down between the side frame lower part, on enclose the frame with enclose down and extend along the fore-and-aft direction separately and can set up along the fore-and-aft direction separately and fold up separately, the wheel carrier sets up with rotating under enclosing on the frame, the gangbar sets up with rotating the wheel carrier with between the side encloses the frame, it makes to enclose down the linkage when the frame is folded up along the fore-and-aft direction the wheel subassembly takes place to overturn.

In some embodiments, the lower frame includes a first lower frame and a second lower frame capable of being rotated and folded relatively, a rear portion of the first lower frame is rotatably connected with a front portion of the second lower frame, the plurality of sets of wheel assemblies includes two sets of front wheel assemblies disposed on left and right sides of a front portion of the first lower frame, and two sets of rear wheel assemblies disposed on left and right sides of a rear portion of the second lower frame, during a process of converting the child trailer from the unfolded state to the folded state, the two sets of front wheel assemblies are turned and folded toward each other, the two sets of rear wheel assemblies are turned and folded toward each other, and the lower frame is folded in the front-rear direction so that the front wheel assemblies and the rear wheel assemblies are folded in the front-rear direction between the first lower frame and the second lower frame.

In some embodiments, the first lower frame includes two first lower surrounding rods respectively disposed on the left and right sides and each extending in the front-rear direction, the second lower frame includes two second lower surrounding rods respectively disposed on the left and right sides and each extending in the left-right direction, the wheel carrier of the front wheel assembly is rotatably disposed on the first lower surrounding rods around the axial line of the first lower surrounding rods, and the wheel carrier of the rear wheel assembly is rotatably disposed on the second lower surrounding rods around the axial line of the second lower surrounding rods.

In some embodiments, on each of the left and right sides of the frame, the lower enclosure frame further includes a lower connecting member, a rear portion of the first lower enclosure rod is rotatably connected to the lower connecting member around a first shaft, a front portion of the second lower enclosure rod is rotatably connected to the lower connecting member around a second shaft, the first shaft and the second shaft both extend in the left-right direction and are arranged in parallel to each other, and a limiting structure for limiting a downward rotation position of the first lower enclosure rod and a downward rotation position of the second lower enclosure rod is further disposed on the lower connecting member.

In some embodiments, a group of said linkage rods is rotatably arranged between said wheel frame of each said front wheel assembly and said surrounding frame of the front side; a group of linkage rods is rotatably arranged between the wheel carrier of each rear wheel assembly and the surrounding frame at the rear side.

In some embodiments, the upper frame includes a first upper frame, an upper connecting member and a second upper frame which are sequentially rotatably connected from front to back, the lower frame includes a first lower frame, a lower connecting member and a second lower frame which are sequentially rotatably connected from front to back, the child trailer is in a folded state, the first upper frame, the first lower frame and the side frame on the front side are mutually folded, the second upper frame, the second lower frame and the side frame on the rear side are mutually folded, the lower connecting member is located above the upper connecting member, and all the wheel assemblies are overturned and folded in a space formed by the upper frame, the lower frame and the two sets of side frames.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: according to the child trailer disclosed by the invention, the frame can be linked with the wheel component to turn and fold relative to the frame in the folding process, so that the wheel component turns along the up-down direction in the folding process of the frame and folds in the folded frame, the height of the folded trailer frame is greatly reduced compared with that of the trailer frame before folding, the overall size of the child trailer after folding is greatly reduced, and convenience is provided for daily storage and carrying of a user.

Drawings

Fig. 1 is a schematic perspective view of a child trailer according to an embodiment of the present invention in a deployed state;

FIG. 2 is a side view schematic of the child trailer of FIG. 1;

FIG. 3 is a schematic perspective view of the child trailer shown in FIG. 1 during folding;

FIG. 4 is a side view schematic of the child trailer of FIG. 3;

FIG. 5 is a rear view of the child trailer of FIG. 3;

FIG. 6 is a schematic perspective view of the child trailer of FIG. 1 in a folded state;

FIG. 7 is a side view of the child trailer of FIG. 6;

FIG. 8 is a rear view of the child trailer of FIG. 6;

Wherein: 1. a first side enclosure frame; 2. a second side enclosure frame; 3. a lower enclosure frame; 31. a first lower frame; 311. a first lower surrounding rod; 312. a first lower cross bar; 32. a second lower frame; 321. a second lower surrounding rod; 322. a second lower cross bar; 33. a lower connecting piece; 34. a first shaft; 35. a second shaft; 4. an upper enclosure frame; 41. a first upper frame; 411. a first upper surrounding rod; 42. a second upper frame; 421. a second upper surrounding rod; 43. an upper connecting piece; 44. a third axis; 45. a fourth axis; 5. a front wheel assembly; 51. a front wheel carrier; 52. a front wheel; 53. a front wheel axle; 6. a rear wheel assembly; 61. a rear wheel carrier; 62. a rear wheel; 63. a rear wheel axle; 7. a front linkage rod; 7a, a front connector; 8. a rear linkage rod; 8a, a rear connector; 9. a towing rod.

Detailed Description

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

The following descriptions of the front, rear, left, right, up, down, etc. orientations are defined with reference to the orientation of the child trailer as viewed by an operator when towing the child trailer in a deployed state, and the reference to the orientation is mainly intended to more clearly illustrate the relative positional relationship between the lever members.

Referring to fig. 1 and 2, a children's trailer is shown, which has an unfolding state and a folding state. The child trailer comprises a frame and a plurality of groups of wheel assemblies arranged at the bottom of the frame, wherein each group of wheel assemblies comprises a wheel frame and a wheel body arranged at the bottom of the wheel frame in a rotating mode around a wheel shaft, the wheel frame is connected to the frame in a rotating mode, a linkage mechanism used for driving the wheel assemblies to overturn is arranged between the frame and the wheel body and comprises a linkage rod, one end portion of the linkage rod is connected to the frame in a universal rotating mode, and the other end portion of the linkage rod is connected to the wheel frame of the wheel assembly to be linked in a universal rotating mode. In the folding process of the frame, the linkage mechanism drives all the wheel assemblies to turn over relative to the frame along the up-down direction and fold in the frame, wherein wheel shafts of the wheel assemblies extend along the left-right direction when the children trailer is in the unfolding state; when the child trailer is converted into the folded state, the wheel axles of the wheel assemblies are converted to extend in the front-rear direction.

Referring to fig. 1 and 2, specifically, the multiple sets of wheel assemblies include a front wheel assembly 5 disposed at the front part of the frame bottom, and a rear wheel assembly 6 disposed at the rear part of the frame bottom, the front wheel assembly 5 includes a front wheel frame 51 extending in the up-down direction, a front wheel 52 rotatably disposed at the bottom of the front wheel frame 51 around a front wheel shaft 53, and the upper part of the front wheel frame 51 is rotatably connected with the frame; the rear wheel assembly 6 includes a rear wheel frame 61 extending in the vertical direction, and a rear wheel 62 rotatably provided at the bottom of the rear wheel frame 61 around a rear wheel shaft 63, and the upper portion of the rear wheel frame 61 is rotatably connected to the vehicle body frame. Here, the front wheel assembly 5 and the rear wheel assembly 6 each have two sets provided on the left and right sides.

This frame encloses the frame including two sets of sides that both sides just all extend along upper and lower direction around locating separately, encloses frame 1 and the second side that is located the rear side for the first side that is located the front side respectively and encloses frame 2, and this frame still encloses frame 4 on setting up on first side between the upper portion of enclosing frame 1 and the upper portion of second side enclosure frame 2 with rotating to and set up and enclose frame 3 under between the lower part of first side enclosure frame 1 and the lower part of second side enclosure frame 2 with rotating. The frame further comprises a towing rod 9, and the towing rod 9 is rotatably connected to the upper part of the first side surrounding frame 1. When the trailer frame is in an unfolded state, a sitting space for a child to sit is formed by enclosing the first side enclosing frame 1, the second side enclosing frame 2, the upper enclosing frame 4 and the lower enclosing frame 3, wherein the lower enclosing frame 3 provides bearing support.

The first side enclosure frame 1 and the second side enclosure frame 2 are both fixed frame-shaped frames, and in this embodiment, the frame-shaped frames cannot be folded along the left-right direction; the lower enclosing frame 3 and the upper enclosing frame 4 extend along the front-back direction and can be respectively folded along the front-back direction, the front wheel assembly 5 and the rear wheel assembly 6 are installed at the bottom of the lower enclosing frame 3, and the lower enclosing frame 3 is linked through a linkage mechanism to enable the front wheel assembly 5 and the rear wheel assembly 6 to turn over when being folded along the front-back direction, so that the lower enclosing frame and the frame are relatively folded. Specifically, the lower frame 3 includes a first lower frame 31 and a second lower frame 32 which can be relatively rotated and folded, a front portion of the first lower frame 31 is rotatably connected to the first side frame 1, a rear portion of the second lower frame 32 is rotatably connected to the second side frame 2, and a rear portion of the first lower frame 31 is rotatably connected to a front portion of the second lower frame 32, where the lower frame 3 further includes a lower connecting member 33 for connecting the rear portion of the first lower frame 31 to the front portion of the second lower frame 32, and the first lower frame 31, the lower connecting member 33, and the second lower frame 32 are sequentially connected from front to rear and extend along the same length direction in an unfolded state of the trailer frame.

In this embodiment, referring to fig. 1, the first lower frame 31 includes two first lower surrounding rods 311 respectively disposed at the left and right sides and extending along the front-back direction, and a first lower cross rod 312 fixedly disposed between the two first lower surrounding rods 311 and extending along the left-right direction; the second lower frame 32 includes two second lower surrounding rods 321 respectively disposed on the left and right sides and extending in the front-rear direction, and a second lower cross rod 322 fixedly disposed between the two second lower surrounding rods 321 and extending in the left-right direction, the lower connecting member 33 has two sets respectively disposed on the left and right sides and rotatably connecting the first lower surrounding rod 311 and the second lower surrounding rod 321 on the sides thereof, specifically, on each of the left and right sides of the lower surrounding frame 3, the rear portion of the first lower surrounding rod 311 is rotatably connected to the front end portion of the lower connecting member 33 around the first shaft 34, the front portion of the second lower surrounding rod 321 is rotatably connected to the rear end portion of the lower connecting member 33 around the second shaft 35, the axial lines of the first shaft 34 and the second shaft 35 extend in the left-right direction and are parallel to each other, and the first shaft 34 is located on the front side of the second shaft 35. The lower connecting member 33 is further provided with a limiting structure for limiting the downward rotation positions of the first lower surrounding rod 311 and the second lower surrounding rod 321, so that the first lower frame 31 and the second lower frame 32 can stably provide bearing support after being unfolded in the front-back direction.

The upper frame 4 comprises a first upper frame 41 and a second upper frame 42 which can be relatively rotated and folded, the front part of the first upper frame 41 is rotatably connected with the first side frame 1, the rear part of the second upper frame 42 is rotatably connected with the second side frame 2, the rear part of the first upper frame 41 is rotatably connected with the front part of the second upper frame 42, here, the upper frame 4 further comprises an upper connecting piece 43 for connecting the rear part of the first upper frame 41 with the front part of the second upper frame 42, and when the trailer frame is in an unfolded state, the first upper frame 41, the upper connecting piece 43 and the second upper frame 42 are sequentially connected from front to back and extend along the same length direction.

In this embodiment, referring to fig. 1, the first upper frame 41 includes two first upper surrounding rods 411 respectively disposed at the left and right sides and extending in the front-rear direction; the second upper frame 42 includes two second upper surrounding rods 421 respectively disposed on the left and right sides and extending in the front-rear direction, the upper connecting member 43 has two sets respectively disposed on the left and right sides for rotatably connecting the first upper surrounding rods 411 and the second upper surrounding rods 421 on the respective sides, specifically, on each of the left and right sides of the upper surrounding frame 4, the rear portions of the first upper surrounding rods 411 are rotatably connected to the front end portion of the upper connecting member 43 around a third shaft 44, the front portions of the second upper surrounding rods 421 are rotatably connected to the rear end portion of the upper connecting member 43 around a fourth shaft 45, the axial lines of the third shaft 44 and the fourth shaft 45 extend in the left-right direction and are parallel to each other, and the third shaft 44 is located at the front side of the fourth shaft 45. The upper connecting member 43 is further provided with a limiting structure for limiting the upward rotation positions of the first upper surrounding rod 411 and the second upper surrounding rod 421, so that the first upper frame 41 and the second upper frame 42 can stably extend in the front-back direction after being unfolded in the front-back direction.

Referring to the drawings, two sets of front wheel assemblies 5 are respectively arranged at the left and right sides of the bottom front part of the first lower frame 31, specifically, on the left and right sides of the vehicle frame, the upper part of the front wheel frame 51 of the front wheel assembly 5 is rotatably connected to the first lower surrounding rod 311 around the axial lead of the first lower surrounding rod 311; the two sets of rear wheel assemblies 6 are respectively provided on the left and right sides of the bottom rear portion of the second lower frame 32, specifically, on each of the left and right sides of the frame, the upper portion of the rear wheel frame 61 of the rear wheel assembly 6 is rotatably connected to the second lower rail 321 around the axis of the second lower rail 321, and the axis of the first lower rail 311 and the axis of the second lower rail 321 both extend in the front-rear direction in the unfolded state of the trailer frame.

The linkage mechanism has four linkage rods, including two front linkage rods 7 for linking the two groups of front wheel assemblies 5 and two rear linkage rods 8 for linking the two groups of rear wheel assemblies 6. The front linkage rod 7 is arranged between the first side surrounding frame 1 and the front wheel assembly 5, two end parts of the front linkage rod 7 are respectively provided with a front connector 7a, two end parts of the front linkage rod 7 are respectively connected with the first side surrounding frame 1 and the front wheel frame 51 in a rotating mode through the front connectors 7a, specifically, as shown in fig. 2, the front part of the first surrounding rod 311 of the first lower frame 31 and the first side surrounding frame 1 are connected to a rotating point A, one end part of the front linkage rod 7 is connected to a rotating point B in a universal rotating mode through the front connectors 7a and the first side surrounding frame 1, the other end part of the front linkage rod 7 is connected to a rotating point C in a universal rotating mode through the front connectors 7a and the front wheel frame 51, the rotating point A is located above the rotating point C, and the rotating point B is located on the inner side of the rotating point C in the left-right direction. The rear linkage rod 8 is arranged between the second side surrounding frame 2 and the rear wheel assembly 6, two end parts of the rear linkage rod 8 are respectively provided with a rear connector 8a, and two end parts of the rear linkage rod 8 are respectively connected with the second side surrounding frame 2 and the rear wheel frame 61 in a rotating mode through the rear connectors 8 a. In this embodiment, the front connector 7a and the rear connector 8a are both ball joint members, but in other embodiments, the front connector 7a and the rear connector 8a may be other joint members capable of realizing universal rotation connection.

Referring to fig. 1 and 2, when the children trailer is in a deployed state, the upper enclosure frame 4 and the lower enclosure frame 3 are deployed along the front-rear direction, the two sets of front wheel assemblies 5 and the two sets of rear wheel assemblies 6 are supported at the bottom of the frame, the front wheel frame 51 and the rear wheel frame 61 extend along the up-down direction, and the towing rod 9 extends obliquely upwards from the back to the front for towing operation.

When the child trailer needs to be folded, referring to fig. 3 to 5, the towing bar 9 is firstly turned downward and folded at the front side of the first side surrounding frame 1, and then the lower connecting member 33 is lifted upward, so that the first lower frame 31 is turned upward relative to the first side surrounding frame 1, the second lower frame 32 is turned upward relative to the second side surrounding frame 2, the first lower frame 31 and the second lower frame 32 are converted to extend in the up-down direction, so that the lower surrounding frame 3 is gradually folded in the front-back direction, and at the same time, the upper connecting member 43 moves downward, so that the first upper frame 41 and the second upper frame 42 are respectively turned downward relative to the first side surrounding frame 1 and the second side surrounding frame 2, so that the upper surrounding frame 4 is gradually folded in the front-back direction.

When the lower surrounding frame 3 is turned and folded, the front linkage rods 7 on the two sides are respectively linked to enable the front wheel assemblies 5 on the two sides to be turned inwards integrally, the two groups of front wheel assemblies 5 are turned towards each other along the left-right direction and are gradually folded relative to the first lower frame 31, the rear linkage rods 8 on the two sides are respectively linked to enable the rear wheel assemblies 6 on the two sides to be turned inwards integrally, and the two groups of rear wheel assemblies 6 are turned towards each other along the left-right direction and are gradually folded relative to the second lower frame 32. In the process that the first lower frame 31 and the second lower frame 32 are gradually changed to extend in the up-down direction, the front wheel assembly 5 and the rear wheel assembly 6 are also turned over, so that the front wheel frame 51 and the rear wheel frame 61 are gradually changed to extend in the front-rear direction.

Referring to fig. 6 to 8, in the folded stroller, the first upper frame 41, the first lower frame 31 and the first side surrounding frame 1 are folded, the second upper frame 42, the second lower frame 32 and the second side surrounding frame 2 are folded, the lower connecting member 33 and the upper connecting member 43 extend in the front-rear direction, the lower connecting member 33 is located above the upper connecting member 43, and all the wheel assemblies, i.e., the two sets of front wheel assemblies 5 and the two sets of rear wheel assemblies 6, are folded in the space defined by the upper surrounding frame 4, the lower surrounding frame 3 and the first side surrounding frame 1 and the second side surrounding frame 2, and are specifically located between the first lower frame 31 and the second lower frame 32 in the front-rear direction. The axial line of the first lower rail 311 and the axial line of the second lower rail 321 are changed to extend in the up-down direction, two sets of front wheel assemblies 5 are arranged side by side in the left-right direction, two sets of rear wheel assemblies 6 are arranged side by side in the left-right direction, the front wheel shaft 53 and the rear wheel shaft 63 extend in the front-rear direction, and the front wheel assemblies 5 and the rear wheel assemblies 6 on the same side of the frame are arranged in an overlapping manner in the front-rear direction. The whole regular square that is of children's trailer after folding, and all wheel subassemblies all accept in the inner space of the folding formation of each member of frame, whole height reduces by a wide margin, has reduced the whole size of children's trailer after folding by a wide margin, and daily the taking in and carrying for the user has brought the facility.

The above-mentioned embodiments are only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the protection scope of the present invention by this, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.

Claims

1. The utility model provides a children's trailer has expansion state and fold condition, children's trailer includes the frame, locates the multiunit wheel subassembly of frame bottom, its characterized in that: every group the wheel subassembly all includes the wheel carrier and around the wheel shaft set up with rotating the wheel body of wheel carrier bottom, the wheel carrier connect with rotating on the frame, the frame with be provided with between the wheel body and be used for the linkage the link gear of wheel subassembly upset, the link gear includes the gangbar at least, one end of gangbar with the frame is connected with universal rotation, another tip of gangbar with the wheel carrier is connected with universal rotation, children's trailer is by the in-process of expansion state to fold condition conversion, the link gear orders about the wheel subassembly is relative the frame is along upper and lower direction upset and draw in the frame.

2. The child trailer of claim 1, wherein: when the child trailer is in a unfolding state, the wheel shafts extend along the left-right direction; when the child trailer is in a folded state, the wheel axle extends in a fore-and-aft direction.

3. The children's trailer of claim 1, wherein: the multiunit the wheel subassembly is including locating two sets of front wheel subassemblies of the anterior left and right sides in frame bottom, locate two sets of rear wheel subassemblies of the rear portion left and right sides in frame bottom works as under child's trailer is in fold condition, two sets of front wheel subassembly is arranged side by side along left right direction, and is two sets of the rear wheel subassembly is arranged side by side along left right direction, lie in on the frame with the front wheel subassembly with the rear wheel subassembly is arranged along front and back direction with overlapping.

4. The children's trailer of claim 1, wherein: all be provided with the connector on two tip on the link length direction, the both ends of link pass through respectively the connector with the wheel carrier reaches the universal ground of rotating of frame is connected, wherein, the connector is the ball joint spare.

5. The children's trailer of claim 1, wherein: the wheel carrier is rotationally connected with the frame around a rotation center line, and the rotation center line extends along the front-back direction when the children trailer is in an unfolded state; child's trailer is under fold condition, the rotation center line extends from top to bottom.

6. The children's trailer according to any one of claims 1 to 5, wherein: the frame encloses the frame, sets up with rotating two sets of side that both sides just all extend along upper and lower direction around locating separately and encloses the frame on two sets of between side wall frame upper portion to and set up with rotating two sets of enclose the frame down between the side wall frame lower part, on enclose the frame with enclose the frame down and extend along the fore-and-aft direction separately and can set up along the fore-and-aft direction separately and fold up separately, the wheel carrier sets up with rotating under enclose on the frame, the gangbar sets up with rotating the wheel carrier with between the frame is enclosed to the side, it makes to enclose the linkage when the frame is folded up along the fore-and-aft direction down the wheel subassembly takes place to overturn.

7. The children's trailer of claim 6, wherein: the child trailer comprises a lower enclosing frame, a plurality of groups of wheel assemblies and a plurality of groups of front wheel assemblies, wherein the lower enclosing frame comprises a first lower frame and a second lower frame which can be relatively rotated and folded, the rear part of the first lower frame is relatively rotatably connected with the front part of the second lower frame, the plurality of groups of wheel assemblies comprise two groups of front wheel assemblies arranged on the left side and the right side of the front part of the first lower frame bottom, and two groups of rear wheel assemblies arranged on the left side and the right side of the rear part of the second lower frame bottom, in the process that the child trailer is converted from an unfolding state to a folding state, the two groups of front wheel assemblies are oppositely turned and folded, the two groups of rear wheel assemblies are oppositely turned and folded, and the lower enclosing frame is folded along the front-back direction so that the front wheel assemblies and the rear wheel assemblies are folded between the first lower frame and the second lower frame along the front-back direction.

8. The child trailer of claim 7, wherein: the first lower frame comprises two first lower surrounding rods which are respectively arranged on the left side and the right side and extend along the front and rear direction, the second lower frame comprises two second lower surrounding rods which are respectively arranged on the left side and the right side and extend along the left and right direction, the wheel frame of the front wheel assembly can be rotatably arranged on the first lower surrounding rods around the axial lead of the first lower surrounding rods, and the wheel frame of the rear wheel assembly can be rotatably arranged on the second lower surrounding rods around the axial lead of the second lower surrounding rods.

9. The child trailer of claim 8, wherein: on each side about the frame, enclose the frame down still includes the lower connecting piece, the rear portion of first enclosing pole connect with around the first axle rotatoryly on the lower connecting piece, the front portion of enclosing pole connect with around the second axle rotatoryly on the lower connecting piece under the second, the first axle with the second axle all extends and sets up parallel to each other along left right direction, still be equipped with on the lower connecting piece and be used for to first enclosing pole with enclose down the limit structure that the pole rotated down the position limited under the second.

10. The child trailer of claim 7, wherein: a group of linkage rods is rotationally arranged between the wheel frame of each front wheel assembly and the surrounding frame on the front side; and a group of linkage rods is rotationally arranged between the wheel frame of each rear wheel assembly and the surrounding frame at the rear side.

11. The child trailer of claim 6, wherein: the child trailer is characterized in that the upper enclosure frame comprises a first upper frame, an upper connecting piece and a second upper frame which are sequentially and rotatably connected from front to back, the lower enclosure frame comprises a first lower frame, a lower connecting piece and a second lower frame which are sequentially and rotatably connected from front to back, the first upper frame, the first lower frame and the side enclosure frame on the front side are mutually folded when the child trailer is in a folded state, the second upper frame, the second lower frame and the side enclosure frame on the rear side are mutually folded, the lower connecting piece is positioned above the upper connecting piece, and all the wheel assemblies are overturned and folded in a space formed by the upper enclosure frame, the lower enclosure frame and the two groups of side enclosure frames in an enclosing mode.