CN213323301U

CN213323301U - Baby carriage with small folding volume

Info

Publication number: CN213323301U
Application number: CN202021370082.6U
Authority: CN
Inventors: 汪蔚; 张洪晨
Original assignee: Butong Internet Of Things Technology Shanghai Co ltd
Current assignee: Butong Internet Of Things Technology Shanghai Co ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2021-06-01
Anticipated expiration: 2030-07-13

Abstract

The utility model discloses a receive baby carriage that closes small volume, including one can expand the state with receive the frame that changes between the state, set up in wheel, the connection of frame lower part between the frame and the wheel drive arrangement, the front wheel and the rear wheel that the wheel set up including the front and back interval work as the frame is from the state of expanding toward receiving when closing the state conversion, drive arrangement is linked and is driven front wheel or rear wheel makes front wheel or/and the relative frame of rear wheel are rotatory around the pivot that extends, so set up, receive the back of closing, the utility model discloses the baby carriage is whole relatively flat, and whole small is convenient for deposit, carry.

Description

Baby carriage with small folding volume

Technical Field

The utility model relates to an infant's product field especially relates to a perambulator.

Background

The stroller is generally convertible between an unfolded state and a folded state, such that the stroller is in the unfolded state when needed, and the stroller can be folded to reduce the occupied space when not needed.

Some conventional strollers are bulky after being folded due to their structures, and thus are inconvenient to carry and store.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned shortcoming, provide a receive and close small perambulator to receive to close back portable, deposit.

In order to achieve the above object, the utility model adopts the following technical scheme:

a baby carriage with small folding volume comprises a carriage frame capable of being converted between an unfolding state and a folding state, wheels arranged on the lower portion of the carriage frame, and a driving device connected between the carriage frame and the wheels, wherein the wheels comprise front wheels and rear wheels which are arranged at intervals in the front-back direction, and when the carriage frame is converted from the unfolding state to the folding state, the driving device is linked to drive the front wheels or/and the rear wheels, so that the front wheels or/and the rear wheels rotate around a rotating shaft extending in the front-back direction relative to the carriage frame.

The frame comprises a bottom support extending forwards and backwards and a supporting piece with the lower end pivoted to the bottom support, the driving device is arranged among the bottom support, the supporting piece and the front wheel, and when the frame is converted from an unfolding state to a folding state, the supporting piece rotates backwards and downwards to link the driving device to drive the front wheel, so that the front wheel rotates around a rotating shaft extending forwards and backwards relative to the frame.

The frame, the front wheel and the drive device are arranged such that when the support is rotated rearwardly and downwardly, the drive device is linked to drive the front wheel such that the front wheel moves rearwardly relative to the base frame and rotates about the forwardly and rearwardly extending axle.

The driving device comprises a connecting piece, a sliding seat which can be relatively connected with the bottom bracket in a back-and-forth movement manner, a linkage piece of which the front end is connected with the front wheel, and a driving piece arranged on the bottom bracket; the upper end of the connecting piece is pivoted with the supporting piece, the lower end of the connecting piece is pivoted with the sliding seat, the linkage piece can be rotationally connected with the sliding seat around the rotating shaft extending in the front-back direction, the linkage piece can also move back and forth relative to the frame together with the sliding seat, and the driving piece is matched with the linkage piece; when the supporting piece rotates backwards and downwards, the sliding seat is linked through the connecting piece to move backwards relative to the bottom support, the front wheel and the linkage piece move backwards along with the sliding seat, the linkage piece is driven by the driving piece to rotate around the rotating shaft extending forwards and backwards in the process of moving backwards, and the front wheel and the linkage piece rotate together.

Linkage includes the linkage and the action section that the linkage rear side extended toward one side, the contained angle between action section and the linkage is greater than 0 degree and is less than 180 degrees.

The driving piece is fixedly connected to the bottom bracket and positioned on the rear side of the sliding seat, an accommodating hole extending forwards and backwards is formed in the driving piece, and a driving groove is formed in the hole wall of the accommodating hole; the rear side of the connecting section can extend into the accommodating hole in a relatively front-back moving mode, the acting section is matched with the driving groove and can move back and forth along the driving groove, and when the frame is converted from the unfolding state to the folding state, the driving groove enables the acting section to rotate around a rotating shaft extending in the front-back direction in the process that the acting section moves back.

The baby carriage is also provided with a locking device for limiting the front wheels to rotate around the rotating shafts extending forwards and backwards when the frame is in an unfolded state, the locking device is arranged between the bottom bracket and a linkage piece or/and the front wheels, and the locking device can be unlocked through the backward movement of the linkage piece relative to the bottom bracket; correspondingly, the linkage piece is set to move backwards relative to the bottom bracket in the process of converting the frame from the unfolding state to the folding state, and after the locking device is unlocked, the linkage piece rotates around the rotating shaft extending forwards and backwards in the process of moving backwards relative to the bottom bracket.

The locking device comprises a fixed seat fixedly connected to the front side of the bottom bracket and a front blocking piece fixedly arranged on the front side of the linkage piece, wherein a containing groove with a backward opening is fixedly arranged on the fixed seat, when the frame is in an unfolded state, at least part of the front blocking piece is positioned in the containing groove of the fixed seat, and the left side wall and the right side wall of the front blocking piece are respectively abutted against the left side wall and the right side wall of the containing groove.

The driving groove comprises a straight groove extending from front to back and a second section groove extending from the rear end of the straight groove to the rear upper side, and the second section groove is a chute or a spiral groove.

The straight groove is set to be in a state that the front baffle piece is completely separated from the fixing seat accommodating groove when the action section moves to the rear end of the straight groove in the process of converting the frame to the folding state.

The driving device, the front wheels and the bottom bracket are also set to be in a state that the front wheels are driven by the driving device to rotate to be parallel to the bottom bracket when the frame is converted from the unfolding state to the folding state.

The frame includes the left and right sides support, each the collateral branch frame all includes end support and support piece, each the end support lower part all is provided with the front wheel, all is provided with between end support, support piece and the front wheel of each collateral branch frame drive arrangement works as when the frame is from the state of opening and closing the state conversion, under drive arrangement's the drive, the front wheel of the left and right sides support is rotatory toward the opposite side.

The utility model has the advantages that:

because the utility model discloses the perambulator has adopted above-mentioned structure to receive the back of closing, the whole relatively flat of perambulator, whole small is convenient for deposit, carry.

Drawings

Fig. 1 is a schematic perspective view of a stroller frame of the present invention in an unfolded state;

fig. 2 is a schematic plan view of the stroller frame of the present invention in an unfolded state;

FIG. 3 is an enlarged schematic view of portion A of FIG. 1;

FIG. 4 is an exploded enlarged schematic view according to FIG. 3;

fig. 5 is an enlarged schematic view of the frame of the stroller of the present invention during the collapsing process;

FIG. 6 is a schematic plane view of the stroller frame in a folded state

Fig. 7 is a perspective enlarged view of the stroller frame of the present invention in a folded state.

Detailed Description

As shown in fig. 1 to 7, the utility model discloses receive and close small baby's car includes one can be in the expansion state with receive the frame 1 that changes between the state, set up in the wheel of frame 1 lower part, connect the drive arrangement between frame 1 and wheel, the wheel includes front wheel 2 and rear wheel 4 that the front and back interval set up, works as when frame 1 is from the expansion state toward receiving the state conversion of closing, drive arrangement is linked and drives front wheel 2 or/and rear wheel 4 makes front wheel 2 or/and rear wheel 4 rotate around the pivot that extends around relative frame 1 of rear wheel.

The frame 1 includes the fore-and-aft extension bottom support 11, preceding lower extreme pin joint in the support piece 12 of bottom support 11, drive arrangement set up in between bottom support 11, support piece 12 and front wheel 2, work as when frame 1 is from the state of opening and closing the state conversion, support piece 12 is rotatory and the linkage in the below backward the drive arrangement drive front wheel 2 for front wheel 2 winds the pivot that extends around is rotatory.

The supporting piece 12 is arranged in an up-down inclined mode, and the supporting piece 11 and the bottom bracket 11 are integrally in an angle shape.

In this embodiment, the frame 1, the front wheel 2 and the driving device are arranged such that when the support member 12 rotates backward and downward, the driving device is interlocked to drive the front wheel 2 so that the front wheel 2 rotates around the forward and backward extending rotation axis in the process of moving backward relative to the bottom bracket 11. And the backward movement and the rotation can be carried out all the time, or the backward movement and the rotation can be carried out simultaneously after moving for a certain distance, or the backward movement and the rotation can be carried out synchronously firstly and then only the backward movement is not rotated.

The driving device comprises a connecting piece 31, a sliding seat 32 which can be relatively connected with the bottom bracket 11 in a back-and-forth movement manner, a linkage piece 33 of which the front end is connected with the front wheel 2, and a driving piece 34 arranged on the bottom bracket 11; the upper end of the connecting piece 31 is pivoted to the supporting piece 12, the lower end is pivoted to the sliding seat 32, the linkage piece 33 can be rotatably connected with the sliding seat 32 around the rotating shaft extending in the front-back direction, the linkage piece 33 can also move back and forth relative to the frame 1 together with the sliding seat 31, and the driving piece 34 is matched with the linkage piece 33; when the supporting member 12 rotates backward and downward, the sliding base 32 moves backward relative to the bottom bracket 11 in a linkage manner through the connecting member 31, the front wheel 2 and the linkage member 33 move backward along with the sliding base 32, the linkage member 33 is driven by the driving member 34 to rotate around the rotating shaft extending forward and backward in the process of moving backward, and the front wheel 2 and the linkage member 33 rotate together. Therefore, when the frame 1 is converted from the unfolding state to the folding state, the front wheels 2 move backwards relative to the bottom bracket 11 and rotate around the rotating shafts extending forwards and backwards.

The linkage 33 includes a connecting section 333 and an acting section 334 extending from the rear side of the connecting section 333 to one side, and an included angle between the acting section 334 and the connecting section 333 is greater than 0 degree and smaller than 180 degrees. In this embodiment, the angle between the connecting segment 333 and the action segment 334 is preferably set to 90 degrees.

The driving member 34 is fixedly connected to the bottom bracket 11 and located at the rear side of the slide carriage 32, and a receiving hole 341 extending forward and backward is formed in the driving member 34, and a driving groove 342 is formed in the hole wall of the receiving hole 341; the connecting section 333 is relatively movably inserted into the receiving hole 341 in a forward and backward direction, the acting section 334 is engaged with the driving groove 342 and is movable forward and backward along the driving groove 342, and the driving groove 342 is configured such that the acting section 334 is rotated about the forward and backward extending rotation shaft by the driving groove 342 during the backward movement of the acting section 334. While the active segment 334 rotates, i.e. the whole linkage 33 rotates, the front wheel 2 rotates accordingly.

Preferably, the driving groove 342 includes a straight groove 3421 extending back and forth and a second groove 3422 extending back and forth from the rear end of the straight groove 3421, and the second groove 3422 is a slanted groove or a spiral groove. The driving slot 342 is configured such that the link member 33 can only move backward and cannot rotate when the action section 334 moves along the straight slot 3421; when the action section 334 moves along the second-section groove 3422, the link 33 rotates about the front-rear extending rotation shaft while moving backward.

Preferably, the stroller of the present invention is further provided with a locking device for limiting the rotation of the front wheel 2 around the front-back extending rotating shaft when the frame is in the unfolded state, the locking device is disposed between the bottom bracket 11 and the linkage 33 or/and the front wheel 2, and the locking device can be unlocked by the backward movement of the linkage 33 relative to the bottom bracket 11; correspondingly, the link 33 is configured such that, in the process of converting the frame 1 from the unfolded state to the folded state, the link 22 moves backward relative to the bottom bracket 11 first, and after the locking device is unlocked, the link 33 rotates around the rotating shaft extending forward and backward in the process of moving backward relative to the bottom bracket 11. That is, the link 33 is only able to move backward relative to the bottom bracket 11 and is not able to rotate about the forward and backward extending rotational axis before the lock device is unlocked, and only after the lock device is unlocked is the front wheel 2 rotatable about the forward and backward extending rotational axis relative to the frame 1 together with the link 33.

In this embodiment, the locking device includes a fixed seat 13 fixedly connected to the front side of the bottom bracket 11, and a front stopper 331 fixedly disposed on the front side of the linking member 33, the fixed seat is provided with a receiving groove 131 opened backward, when the frame 1 is in the unfolded state, at least a portion of the front stopper 331 is located in the receiving groove 131 of the fixed seat 13, and the left and right side walls of the front stopper 331 respectively abut against the left and right side walls of the receiving groove 131. So set up, when frame 1 is in the expansion state, preceding fender part 331 can not be rotatory around the pivot that the fore-and-aft direction extends relatively fixing base 13 to linkage 33 can not be rotatory around the pivot that extends around, and front wheel 2 also can not be rotatory around the pivot that extends around, so can guarantee frame 1 when being in the expansion state stability that front wheel 2 marched, and then guarantee the utility model discloses the security of perambulator use.

Corresponding to the arrangement of the locking device, the straight groove 3421 is arranged such that when the action section 334 moves to the rear end of the straight groove 3421, the front stop member 331 is completely separated from the accommodating groove 131 of the fixing seat 13. Specifically, the front blocking member 331 may just completely disengage from the accommodating groove 131 of the fixing base 13 when the action section 334 moves to the rear end of the straight groove 3421, or the front blocking member 331 may completely disengage from the accommodating groove 131 of the fixing base 13 when the action section 334 has not moved to the rear end of the straight groove 3421, so that the front blocking member 331 is completely disengaged from the accommodating groove 131 of the fixing base 13 when the action section 334 moves to the rear end of the straight groove 3421.

The front lower end of the supporting member 12 is pivotally connected to the fixing base 13.

The front stop 331 may be integrally formed on the linkage member 33 by injection molding or may be fixed relative to the linkage member 33 by other known and feasible structures.

In this embodiment, the driving member 34 is further provided with a through hole 343 extending forward and backward, and the driving member 34 is fixedly sleeved on the bottom bracket 11 through the through hole 343. In other embodiments, the driving member 34 can be fixedly connected to the bottom bracket 11 by other known and feasible methods. In this embodiment, the sliding seat 32 is provided with a first through hole 321 penetrating through the sliding seat in a front-back direction, the linkage member 33 can relatively rotatably penetrate through the first through hole 321, the linkage member 33 is further provided with a rear stopper 332, the front stopper 331 abuts against the front end of the sliding seat 32, and the rear stopper 332 abuts against the rear end of the sliding seat 32. With such an arrangement, the sliding base 32 and the linkage 33 can rotate relative to each other and can move back and forth relative to the frame 1, so that when the linkage 33 rotates, the linkage 33 can rotate relative to the sliding base 32 without affecting the sliding base 32. In other embodiments, the front stop 331 only cooperates with the receiving slot 131, and the linkage 33 is additionally provided with a component abutting against the front end of the sliding seat.

In this embodiment, the sliding base 32 is further provided with a second through hole 322 penetrating in the front and back direction, and the bottom bracket 11 can pass through the second through hole 322 in a relatively back and forth movement manner, so that the sliding base 32 can move in the back and forth movement manner relative to the bottom bracket 11. Preferably, the first through holes 321 and the second through holes 322 are disposed at intervals. In other embodiments, the slide 32 can also be connected to the base support 11 in a manner that allows it to move back and forth relative to the base support.

The sliding base 32 is further provided with a pivoting portion 323 for pivotally connecting the lower end of the connecting member 31.

The front wheel 2 is connected with a wheel seat 21, and the front end of the linkage piece 33 is connected with the wheel seat 21. The connection between the wheel seat 21 and the front wheel 2 and the connection between the linkage 33 and the wheel seat 21 can be any known structure, which is not the invention of the present invention and therefore will not be described herein. In other embodiments, the wheel seat 21 can be considered as a part of the linkage 33.

In this embodiment, frame 1 includes left and right sides support 10, each side support 10 all includes bottom support 11 and support piece 12, each bottom support 11 lower part all is provided with front wheel 2, all is provided with between bottom support 11, support piece 12 and the front wheel 2 of each side support 10 drive arrangement works as when frame 1 is from the state of opening out toward closing the state conversion drive arrangement's drive is down, the front wheel 2 of left and right sides support 10 is toward all toward the inboard rotation, two front wheel 2 relative rotations promptly to the size of the perambulator of closing in left and right sides orientation also can diminish.

The linkage 33 on each side bracket 10 is arranged at the inner side of the corresponding side bottom bracket 11, and the driving groove 342 on the driving part 34 of the driving device on the corresponding side is arranged at the inner side of the driving part 34, so that when the frame 1 is folded, the two front wheels 2 rotate towards the inner side.

Each side support 10 still all includes fixing base 13, in order to guarantee the stability that frame 1 used under the expanded state, frame 1 still includes that both ends connect respectively in the front connecting rod 14 of the fixing base 13 on the left and right sides support 10 about, both ends connect respectively in the back connecting rod 15 of the bottom bracket 11 rear side of left and right sides support 10 about.

The baby carriage also comprises rear wheels 4 arranged at the rear lower part of the frame 1, wherein the rear end of each bottom bracket 11 is connected with the rear wheels 4, or the left end and the right end of each rear connecting rod 15 are connected with the rear wheels 4, or the rear wheels 4 are only arranged in the middle of the rear connecting rods 15.

The utility model discloses still be provided with the locking mechanical system who is used for locking the perambulator in the expansion state on the perambulator, locking mechanical system and the mode of unblock this locking mechanical system can be arbitrary publicly known feasible technique, because of not the utility model discloses an invent point, therefore do not give unnecessary details here.

When the stroller of the present invention needs to be folded, the locking mechanism is firstly unlocked, then the supporting member 12 is made to rotate backward and downward, when the supporting member 12 rotates backward and downward, the connecting member 31 is driven to drive the sliding seat 32 to move backward relative to the bottom bracket 11, and then the linking member 33, the wheel seat 21 and the front wheel 2 are driven to move backward together by the rear stopper 332, because the front section of the driving groove 342 is the straight groove 3421, the linking member 33, the wheel seat 21 and the front wheel 2 can only move backward along with the movement of the sliding seat 32, and cannot rotate, so that the front stopper 331 can be completely separated from the accommodating groove 131 of the fixing seat 13 conveniently, and the folding of the stroller cannot be interfered; after the action section 334 of the linkage 33 enters the second section groove 3422, because the second section groove 3422 is configured as a skewed slot or a spiral slot, as the linkage 33 moves backwards, the slot wall of the second section groove 3422 drives the action section 334 to rotate, the linkage 33 rotates with the action section 334, so that the front stop 331 connected with the linkage 33, the wheel seat 21 and the front wheel 2 move backwards and rotate simultaneously, and the two front wheels 2 rotate inwards, i.e. the two front wheels 2 rotate relatively (as shown in fig. 5); until the support member 12 can not rotate backward and downward, the baby carriage is completely folded. The utility model discloses when the perambulator is in to close the state of closing, support piece 12 folds and leans on in the bottom bracket 11 top, connecting piece 31 also with bottom bracket 11, support piece 12 draw close, effect section 334 removes the rear end to second section groove 3422, two front wheel 2 all rotates to the state parallel with bottom bracket 11 and is located between two bottom bracket 11 (as shown in fig. 6, 7).

Because the front wheel 2 can rotate around the rotating shaft extending from front to back in the process of folding the frame, the size of the folded baby carriage in the up-down direction can be reduced, and the folded baby carriage is relatively flat, so that the folded baby carriage has small integral volume and is convenient to store and carry; secondly, when the baby carriage is in a folding state, the two front wheels 2 are positioned between the two bottom brackets 11, so that the size of the folded baby carriage in the left and right directions is small, and the volume of the folded baby carriage is small; just locking device not only can guarantee the utility model discloses the security that the perambulator used, the setting of its specific structure does not influence the receipts of frame 1 in addition and close and the removal of front wheel 2 is rotatory to also can guarantee that the perambulator receives the small size after closing.

Preferably, the frame 1, the front wheel 2 and the driving device are configured such that when the frame 1 is converted from the unfolded state to the folded state, the front wheel 2 is driven by the driving device to rotate to be parallel to the bottom bracket 11. So set up, further reduced the ascending size in the upper and lower direction of perambulator after the receipts are closed, namely made the perambulator after the receipts are closed flatter, whole volume is littleer. Correspondingly, the second section groove 3422 of the driving groove 342 is configured such that the front wheel 2 is at least in a state of being parallel to the bottom bracket 11 when the acting section 334 moves to the rear end of the second section groove 3422. In other embodiments, the driving slot 342 may further include a rear straight slot extending backward from the second section slot 3422, and when the action section 334 of the link 33 is located at the end of the second section slot 3422, the stroller of the present invention is not yet completely folded, i.e., the supporting member 12 may further continue to rotate backward and downward, at this time, the link 33 still continues to move backward under the driving of the sliding seat 32, at this time, the action section 334 of the link 33 moves in the rear straight slot, so that the link 33 and the front wheel 2 only move backward and cannot rotate, i.e., the front wheel 2 is driven to rotate to be parallel to the bottom bracket and then does not rotate, but can continue to move backward until the stroller is completely folded.

In another embodiment, a subsequent inclined groove or spiral groove may be further extended backward from the rear end of the second section of groove 3422, so that the front wheel 2 can continue to rotate after rotating to a state parallel to the bottom bracket 11 along with the link member 33 as long as the upper end of the front wheel 2 does not exceed the upper end of the folded frame 1, and thus the overall height of the folded frame 1 is not affected, and the overall size of the folded stroller is small, flat and small.

In another embodiment, the stroller of the present invention may be in a folded state, and the front wheel 2 does not rotate to a state parallel to the bottom bracket 11, that is, the front wheel 2 does not rotate to a state parallel to the bottom bracket 11 in the folding process of the stroller frame. In this way, the vertical dimension of the collapsed stroller is larger than that of the stroller in which the front wheel 2 is rotated to be parallel to the bottom bracket 11, but is smaller than that of the stroller in which the front wheel 2 is not rotated at all, so that the vertical dimension of the collapsed stroller can be reduced to some extent.

In this embodiment, the frame 1 further includes a handle 16 having a lower end pivotally connected to the upper end of the support member 12, and a push handle 17 having a lower end movably connected to the inside of the upper end of the handle 16. When frame 1 is in when unfolding, handlebar 16 can make the whole highly suitable nurse's shallow of frame 1 with pushing away handle 17, when closing the utility model discloses the perambulator, can make push away handle 17 and move down to can not remove again relatively handlebar 16, rotate forward again handlebar 16 makes simultaneously handlebar 16 lower extreme is toward the below swivelling movement in the back to drive support piece 12 is toward the below swivelling movement in the back. When the stroller is folded, the push handle 17 is folded over the support member 12, so that the folded stroller is still relatively flat and relatively small in overall volume. In other embodiments, the push handle 17 may not be provided, but only the rider 16 may be provided with a lower end pivotally connected to the upper end of the support member 12; or only the rider 16 may be provided with a lower end that is connected to the upper end of the support member 12 for up and down movement.

In the above description of the orientation, the direction of the front wheel 2 is taken as the front, the direction of the rear wheel 4 is taken as the rear, the directions of the two side brackets 10 are taken as the left and right, the direction of the push handle 17 is taken as the upper, the direction of the bottom bracket 11 is taken as the lower, the inner side refers to the side of the two side brackets 10 opposite to each other, and the outer side refers to the side of the two side brackets 10 away from each other.

Claims

1. The utility model provides a baby carriage that volume is little that closes which characterized in that: the foldable bicycle comprises a bicycle frame capable of being converted between an unfolding state and a folding state, wheels arranged on the lower portion of the bicycle frame, and a driving device connected between the bicycle frame and the wheels, wherein the wheels comprise front wheels and rear wheels which are arranged at intervals front and back, and when the bicycle frame is converted from the unfolding state to the folding state, the driving device is linked to drive the front wheels or/and the rear wheels, so that the front wheels or/and the rear wheels rotate around a rotating shaft extending front and back relative to the bicycle frame.

2. The stroller of claim 1, wherein: the frame comprises a bottom support extending forwards and backwards and a supporting piece with the lower end pivoted to the bottom support, the driving device is arranged among the bottom support, the supporting piece and the front wheel, and when the frame is converted from an unfolding state to a folding state, the supporting piece rotates backwards and downwards to link the driving device to drive the front wheel, so that the front wheel rotates around a rotating shaft extending forwards and backwards relative to the frame.

3. The stroller of claim 2, wherein: the frame, the front wheel and the drive device are arranged such that when the support is rotated rearwardly and downwardly, the drive device is linked to drive the front wheel such that the front wheel moves rearwardly relative to the base frame and rotates about the forwardly and rearwardly extending axle.

4. The collapsed small volume stroller of claim 3, further comprising: the driving device comprises a connecting piece, a sliding seat which can be relatively connected with the bottom bracket in a back-and-forth movement manner, a linkage piece of which the front end is connected with the front wheel, and a driving piece arranged on the bottom bracket; the upper end of the connecting piece is pivoted with the supporting piece, the lower end of the connecting piece is pivoted with the sliding seat, the linkage piece can be rotationally connected with the sliding seat around the rotating shaft extending in the front-back direction, the linkage piece can also move back and forth relative to the frame together with the sliding seat, and the driving piece is matched with the linkage piece; when the supporting piece rotates backwards and downwards, the sliding seat is linked through the connecting piece to move backwards relative to the bottom support, the front wheel and the linkage piece move backwards along with the sliding seat, the linkage piece is driven by the driving piece to rotate around the rotating shaft extending forwards and backwards in the process of moving backwards, and the front wheel and the linkage piece rotate together.

5. The collapsed small volume stroller of claim 4, further comprising: linkage includes the linkage and the action section that the linkage rear side extended toward one side, the contained angle between action section and the linkage is greater than 0 degree and is less than 180 degrees.

6. The stroller of claim 5, wherein: the driving piece is fixedly connected to the bottom bracket and positioned on the rear side of the sliding seat, an accommodating hole extending forwards and backwards is formed in the driving piece, and a driving groove is formed in the hole wall of the accommodating hole; the rear side of the connecting section can extend into the accommodating hole in a relatively front-back moving mode, the acting section is matched with the driving groove and can move back and forth along the driving groove, and when the frame is converted from the unfolding state to the folding state, the driving groove enables the acting section to rotate around a rotating shaft extending in the front-back direction in the process that the acting section moves back.

7. The collapsed small volume stroller of claim 6, further comprising: the driving groove comprises a straight groove extending from front to back and a second section groove extending from the rear end of the straight groove to the rear upper side, and the second section groove is a chute or a spiral groove.

8. The stroller of claim 4, 5 or 6, wherein: the baby carriage is also provided with a locking device for limiting the front wheels to rotate around the rotating shafts extending forwards and backwards when the frame is in an unfolded state, the locking device is arranged between the bottom bracket and a linkage piece or/and the front wheels, and the locking device can be unlocked through the backward movement of the linkage piece relative to the bottom bracket; correspondingly, the linkage piece is set to move backwards relative to the bottom bracket in the process of converting the frame from the unfolding state to the folding state, and after the locking device is unlocked, the linkage piece rotates around the rotating shaft extending forwards and backwards in the process of moving backwards relative to the bottom bracket.

9. The stroller of claim 8, further comprising: the locking device comprises a fixed seat fixedly connected to the front side of the bottom bracket and a front blocking piece fixedly arranged on the front side of the linkage piece, wherein a containing groove with a backward opening is fixedly arranged on the fixed seat, when the frame is in an unfolded state, at least part of the front blocking piece is positioned in the containing groove of the fixed seat, and the left side wall and the right side wall of the front blocking piece are respectively abutted against the left side wall and the right side wall of the containing groove.

10. The collapsed small volume stroller of claim 7, further comprising: the baby carriage is also provided with a locking device for limiting the front wheels to rotate around the rotating shafts extending forwards and backwards when the frame is in an unfolded state, the locking device is arranged between the bottom bracket and a linkage piece or/and the front wheels, and the locking device can be unlocked through the backward movement of the linkage piece relative to the bottom bracket; correspondingly, the linkage piece is set to move backwards relative to the bottom bracket in the process of converting the frame from the unfolding state to the folding state, and after the locking device is unlocked, the linkage piece rotates around the rotating shaft extending forwards and backwards in the process of moving backwards relative to the bottom bracket.

11. The collapsed small volume stroller of claim 10, further comprising: the locking device comprises a fixed seat fixedly connected to the front side of the bottom bracket and a front blocking piece fixedly arranged on the front side of the linkage piece, wherein a containing groove with a backward opening is fixedly arranged on the fixed seat, when the frame is in an unfolded state, at least part of the front blocking piece is positioned in the containing groove of the fixed seat, and the left side wall and the right side wall of the front blocking piece are respectively abutted against the left side wall and the right side wall of the containing groove.

12. The collapsed small volume stroller of claim 11, further comprising: the straight groove is set to be in a state that the front baffle piece is completely separated from the fixing seat accommodating groove when the action section moves to the rear end of the straight groove in the process of converting the frame to the folding state.

13. The stroller according to any one of claims 2 to 7 and 9 to 12, wherein: the driving device, the front wheels and the bottom bracket are also set to be in a state that the front wheels are driven by the driving device to rotate to be parallel to the bottom bracket when the frame is converted from the unfolding state to the folding state.

14. The collapsed small volume stroller of claim 8, further comprising: the driving device, the front wheels and the bottom bracket are also set to be in a state that the front wheels are driven by the driving device to rotate to be parallel to the bottom bracket when the frame is converted from the unfolding state to the folding state.

15. The stroller of any one of claims 2 to 7, 9 to 12, and 14, wherein: the frame includes the left and right sides support, each the collateral branch frame all includes end support and support piece, each the end support lower part all is provided with the front wheel, all is provided with between end support, support piece and the front wheel of each collateral branch frame drive arrangement works as when the frame is from the state of opening and closing the state conversion, under drive arrangement's the drive, the front wheel of the left and right sides support is rotatory toward the opposite side.

16. The collapsed small volume stroller of claim 8, further comprising: the frame includes the left and right sides support, each the collateral branch frame all includes end support and support piece, each the end support lower part all is provided with the front wheel, all is provided with between end support, support piece and the front wheel of each collateral branch frame drive arrangement works as when the frame is from the state of opening and closing the state conversion, under drive arrangement's the drive, the front wheel of the left and right sides support is rotatory toward the opposite side.

17. The collapsed small volume stroller of claim 13, further comprising: the frame includes the left and right sides support, each the collateral branch frame all includes end support and support piece, each the end support lower part all is provided with the front wheel, all is provided with between end support, support piece and the front wheel of each collateral branch frame drive arrangement works as when the frame is from the state of opening and closing the state conversion, under drive arrangement's the drive, the front wheel of the left and right sides support is rotatory toward the opposite side.

18. The collapsed small volume stroller of claim 15, further comprising: the frame includes the left and right sides support, each the collateral branch frame all includes end support and support piece, each the end support lower part all is provided with the front wheel, all is provided with between end support, support piece and the front wheel of each collateral branch frame drive arrangement works as when the frame is from the state of opening and closing the state conversion, under drive arrangement's the drive, the front wheel of the left and right sides support is rotatory toward the opposite side.