CN217864311U - Transmission mechanism for baby carriage and baby carriage - Google Patents

Abstract

The utility model discloses a drive mechanism for child's bike, the fixed first connecting seat that is equipped with on the first support, the fixed second connecting seat that is equipped with on the second support, the fixed third connecting seat that is equipped with on the third support, first connecting seat, second connecting seat and the mutual rotatable coupling of third connecting seat make first support, second support and third support can expand or fold, be equipped with its pivoted bevel gear relatively on the second connecting seat, be equipped with on the first connecting seat with bevel gear meshing and can drive bevel gear pivoted first profile of tooth portion when first support is rotated to the second support and is drawn close, be equipped with along the circumferencial direction on the third connecting seat and can cooperate with bevel gear and make the second profile of tooth portion that the third support rotated to the second support and draw close when first profile of tooth portion drives bevel gear rotation. The utility model discloses still disclose a child's bike that adopts aforementioned drive mechanism. The utility model is used for the drive mechanism and the child's bike of child's bike receive and close smoothly, receive to close the back small.

Description

Transmission mechanism for child vehicle and child vehicle

[ technical field ] A method for producing a semiconductor device

The utility model relates to a drive mechanism for child's bike. The utility model discloses still relate to a child's bike.

[ background of the invention ]

The children's vehicle is a common product in the growth process of children. Current child carts are generally capable of being unfolded or folded. When the child stroller is unfolded, a child is taken in the child stroller, an adult pushes the child stroller through the hand push handle, and when the child stroller is folded, the child stroller is convenient to carry or store. However, the current child car has the following disadvantages: the existing child car is complex in unfolding or folding transmission mechanism, so that the folded child car is large in size, and the problem of unsmooth unfolding or folding process is easy to occur.

Therefore, the present invention is based on the above disadvantages.

[ Utility model ] A method for manufacturing a semiconductor device

The utility model aims at overcoming the defects of the prior art and providing a transmission mechanism for a baby carriage with simple structure. The child bicycle adopting the transmission mechanism is smooth in unfolding or folding process, small in size after being folded and convenient to carry and store.

The utility model also provides an adopt the children's bike of the drive mechanism of aforementioned children's bike, simple structure closes small after closing, closes smoothly.

The utility model discloses a realize through following technical scheme:

the utility model provides a drive mechanism for child's bike, includes first support 1, second support 2 and third support 3, first support 1 on fixed be equipped with first connecting seat 11, second support 2 on fixed be equipped with second connecting seat 21, third support 3 on fixed be equipped with third connecting seat 31, first connecting seat 11, second connecting seat 21 and the mutual rotatable coupling of third connecting seat 31 and make first support 1, second support 2 and third support 3 can expand or fold, second connecting seat 21 on be equipped with and to drive bevel gear 4 pivoted bevel gear 4 relatively, first connecting seat 11 on be equipped with along the circumferencial direction with bevel gear 4 meshing and can drive bevel gear 4 pivoted first profile of tooth portion 5 when first support 1 rotates relative second support 2 and draws close, third connecting seat 31 on be equipped with along the circumferencial direction and can cooperate with bevel gear 4 when first profile of tooth portion 5 drives bevel gear 4 and make third support 3 draw close to second support 2 pivoted second profile of tooth portion 6.

The first connecting seat 11 includes a first middle connecting seat 111 and first outer connecting seats 112 disposed at both sides of the first middle connecting seat 111 and fixedly connected to the first bracket 1, the first middle connecting seat 111 and the first outer connecting seats 112 are fixedly connected by a connecting shaft 12, a first connecting groove 113 is formed between the first middle connecting seat 111 and the first outer connecting seat 112, the third connecting seat 31 includes third connecting seat bodies 311 fixedly connected to an upper end of the third bracket 3 and disposed at intervals, the third connecting seat bodies 311 are inserted into the first connecting groove 113 and rotatably connected to the first connecting seat 11 by the connecting shaft 12, the second connecting seat 21 includes second connecting seat bodies 211 disposed at intervals, connecting portions 212 connected to the second connecting seat bodies 211 are disposed between the second connecting seat bodies 211, the bevel gears 4 are connected to the connecting portions 212, the second connecting seat bodies 211 are inserted between the third connecting seat bodies 311 and the first outer connecting seats 112 and connected to the first connecting seat bodies 11 by the connecting shaft 12, the first tooth-shaped portion 5 is disposed on the first middle connecting seat body 111, and the first tooth-shaped portion 311 is disposed on one of the first connecting seat body 6.

The locking mechanism of the transmission mechanism for the child car comprises a first locking component 71 arranged between a first outer side connecting seat 112 and a second connecting seat 211 and a second locking component 72 arranged between the second connecting seat 211 and a third connecting seat 311, a linkage piece 73 which can drive the first locking component 71 to unlock when the second locking component 72 unlocks is arranged between the second locking component 72 and the first locking component 71, and an unlocking piece 74 used for unlocking the second locking component 72 is further arranged in the first support 1.

The second locking assembly 72 includes a third locking groove 721 circumferentially disposed on the third connecting seat 311, a second inner locking groove 722 circumferentially disposed on the second connecting seat 211 and on a side opposite to the third connecting seat 311, a second spline 723 capable of moving transversely and simultaneously engaging with the third locking groove 721 and the second inner locking groove 722 is disposed between the third connecting seat 311 and the second connecting seat 211, the unlocking member 74 is connected to the second spline 723 so that the second spline 723 can be disengaged from the third locking groove 721 when the unlocking member 74 operates, and a first return spring 724 capable of transversely returning the second spline 723 is disposed between the second spline 723 and the second connecting seat 211.

The first locking assembly 71 includes a first locking groove 711 circumferentially disposed on the first outer connecting seat 112, a second locking groove 712 circumferentially disposed on the second connecting seat 211 and on a side opposite to the first outer connecting seat 112, a first spline 713 capable of moving transversely and simultaneously engaging with the second locking groove 712 and the first locking groove 711 is disposed between the second connecting seat 211 and the first outer connecting seat 112, a second return spring 714 capable of transversely returning the first spline 713 is further disposed between the first spline 713 and the first outer connecting seat 112, and the linkage member 73 includes a pushing post disposed on the second spline 723 and transversely penetrating through the second connecting seat 211 to push the first spline 713.

The unlocking member 74 includes a pulling rope 741 connected to the second spline 723 and capable of pulling the second spline 723 to move transversely, a pushing block 742 capable of sliding downwards to push the pulling rope 741 so that the pulling rope 741 pulls the second spline 723 is disposed in the first bracket 1, and a third return spring 743 capable of pushing the pushing block 742 to return is further disposed between the pushing block 742 and the first bracket 1.

A child car comprises the transmission mechanism for the child car, a front wheel 32 is arranged at the lower end of a third support 3, a rear wheel 22 is arranged at the lower end of a second support 2, and a hand push handle 8 is connected to a first support 1.

The child car further comprises a seat supporting piece 9 capable of being folded towards the third support 3, the seat supporting piece 9 comprises a supporting frame 91, the rear end of the supporting frame 91 is rotatably connected with a protruding portion 312 on the third connecting seat 31, a transmission gear 92 is rotatably connected onto the third support 3, a transmission rod 93 hinged with the eccentric position of the transmission gear 92 and the front end of the supporting frame 91 is arranged between the eccentric position of the transmission gear 92 and the front end of the supporting frame 91, and a third tooth-shaped portion 94 which is meshed with the transmission gear 92 and can drive the seat supporting piece 9 to be folded towards the second support 2 through the transmission gear 92 when the third support 3 rotates towards the second support 2 to be folded towards the third support is further arranged on the second connecting seat 21.

A foldable seat assembly 96 is connected to the support frame 91.

The handle 8 is slidably or rotatably connected to the first frame 1, and a handle 95 for lifting the child car is provided at the rear end of the support frame 91.

Compared with the prior art, the utility model discloses there is following advantage:

1. the utility model discloses a first connecting seat for drive mechanism of perambulator, second connecting seat and third connecting seat rotation link together, be provided with bevel gear on the second connecting seat, when the relative second support of first support rotates and draws close, first profile of tooth portion on the first connecting seat drives bevel gear and rotates, and bevel gear just drives the third connecting seat rotation through on the third connecting seat and rather than the second profile of tooth portion of meshing at the pivoted in-process, the third connecting seat just drives the third support and draws close to the second support rotation at the pivoted in-process, finally realize that first support and third support all draw close to the second support folding. Whole simple structure is compact, can realize folding or expand through the cooperation of first profile of tooth portion, second profile of tooth portion and bevel gear, no longer need set up the connecting rod structure in the outside of first support, second support and third support for folding back small, it is smooth and easy to close to adopt this drive mechanism's child's bike.

2. The utility model discloses the perambulator adopts aforementioned drive mechanism, and first profile of tooth portion, second profile of tooth portion and bevel gear all set up in the inside of first connecting seat, second connecting seat and third connecting seat and do not expose for the perambulator is closed and is closed smoothly, and simple structure is compact, and it is small to close the back, is fit for popularization and application.

[ description of the drawings ]

FIG. 1 is one of the exploded views of the drive mechanism for a child's vehicle of the present invention;

FIG. 2 is a second exploded view of the transmission mechanism for the child's vehicle of the present invention;

FIG. 3 is a perspective view of the components of the drive mechanism for the child's vehicle of the present invention;

FIG. 4 is an expanded schematic view of the drive mechanism for the child's vehicle of the present invention;

FIG. 5 is a schematic view of the drive mechanism for a child's vehicle of the present invention during folding;

FIG. 6 is a side view of the child's vehicle of the present invention;

FIG. 7 is a perspective view of the child's vehicle of the present invention;

FIG. 8 is a side view of the child's vehicle during folding;

FIG. 9 is a side view of the stroller of the present invention in a folded state;

FIG. 10 is a perspective view of the child's vehicle of the present invention with the seat assembly removed;

FIG. 11 is one of the exploded views of the components of the child's vehicle of the present invention;

FIG. 12 is a second exploded view of the components of the child's vehicle of the present invention;

fig. 13 is a third exploded view of the components of the child's vehicle of the present invention.

[ detailed description ] embodiments

The invention will be further described with reference to the accompanying drawings:

as shown in fig. 1 to 5, a transmission mechanism for a child's bike comprises a first support 1, a second support 2 and a third support 3, wherein the first support 1 is fixedly provided with a first connecting seat 11, the second support 2 is fixedly provided with a second connecting seat 21, the third support 3 is fixedly provided with a third connecting seat 31, the first connecting seat 11, the second connecting seat 21 and the third connecting seat 31 are rotatably connected with each other to enable the first support 1, the second support 2 and the third support 3 to be unfolded or folded, the second connecting seat 21 is provided with a bevel gear 4 capable of rotating relative to the second connecting seat, the first connecting seat 11 is provided with a first tooth-shaped portion 5 which is meshed with the bevel gear 4 along the circumferential direction and can drive the bevel gear 4 to rotate when the first support 1 is closed relative to the second support 2, and the third connecting seat 31 is provided with a second tooth-shaped portion 6 which can be matched with the bevel gear 4 to enable the third support 3 to rotate toward the second support 2 when the first tooth-shaped portion 5 drives the bevel gear 4 to rotate. First connecting seat 11, second connecting seat 21 and third connecting seat 31 are in the same place of rotating each other, be provided with bevel gear 4 on the second connecting seat 21, when first support 1 rotates relative second support 2 and draws close, first profile of tooth portion 5 on the first connecting seat 11 drives bevel gear 4 and rotates, and bevel gear 4 just drives third connecting seat 31 through on the third connecting seat 31 and rather than the second profile of tooth portion 6 of meshing at the pivoted in-process, third connecting seat 31 just drives third support 3 and rotates to draw close to second support 2 at the pivoted in-process, finally realize that first support 1 and third support 3 all draw close to folding to second support 2. Whole simple structure is compact, can realize folding or expand through the cooperation of first profile of tooth portion 5, second profile of tooth portion 6 and bevel gear 4, no longer need set up the connecting rod structure in the outside of first support 1, second support 2 and third support 3 for the folding back of child's bike that adopts this drive mechanism is small, and it is smooth and easy to fold.

As shown in fig. 1 to 4, the first connecting seat 11 includes a first middle connecting seat 111 and first outer connecting seats 112 disposed at both sides of the first middle connecting seat 111 and fixedly connected to the first bracket 1, the first middle connecting seat 111 and the first outer connecting seats 112 are fixedly connected by a connecting shaft 12, a first connecting groove 113 is formed between the first middle connecting seat 111 and the first outer connecting seat 112, the third connecting seat 31 includes third connecting seat bodies 311 fixedly connected to the upper end of the third bracket 3 and spaced from each other, the third connecting seat bodies 311 are inserted into the first connecting groove 113 and rotatably connected to the first connecting seat 11 by the connecting shaft 12, the second connecting seat 21 includes second connecting seat bodies 211 spaced from each other, a connecting portion 212 is disposed between the second connecting seat bodies 211 and connected to the first connecting seat 11, the bevel gear 4 is connected to the connecting portion 212, the second connecting seat bodies 211 are inserted between the third connecting seat bodies 311 and the first outer connecting seat 112 and rotatably connected to the first connecting seat 11 by the connecting shaft 12, the first tooth-shaped connecting seat body 111 is disposed on the first tooth portion 5, and the first connecting seat body 111 is disposed on the first tooth-shaped connecting seat body 6. Therefore, the whole first tooth-shaped part 5, the whole second tooth-shaped part 6 and the whole bevel gear 4 are arranged inside the first connecting seat 11, the second connecting seat 21 and the third connecting seat 31, and the first connecting seat 11, the second connecting seat 21 and the third connecting seat 31 are rotatably connected around the same axis through the connecting shaft 12, so that the folding is flexible, and the structure is simple and compact.

As shown in fig. 11 to 13, the locking mechanism of the transmission mechanism for the child car includes a first locking component 71 disposed between the first outer connecting seat 112 and the second connecting seat 211 and a second locking component 72 disposed between the second connecting seat 211 and the third connecting seat 311, a linkage component 73 capable of driving the first locking component 71 to unlock when the second locking component 72 is unlocked is disposed between the second locking component 72 and the first locking component 71, and an unlocking component 74 for unlocking the second locking component 72 is further disposed in the first bracket 1. When the unlocking piece 74 unlocks the second locking component 72, the linkage piece 73 can simultaneously unlock the first locking component 71, so that the first support 1 and the second support 2, and the third support 3 and the second support 2 are simultaneously unlocked, the design is ingenious, and the operation is convenient.

As shown in fig. 11 to 13, the second locking assembly 72 includes a third locking groove 721 circumferentially disposed on the third connecting seat 311, a second inner locking groove 722 circumferentially disposed on the second connecting seat 211 and on a side opposite to the third connecting seat 311, a second spline 723 capable of moving transversely and being engaged with the third locking groove 721 and the second inner locking groove 722 is disposed between the third connecting seat 311 and the second connecting seat 211, the unlocking member 74 is connected to the second spline 723 so that the second spline 723 can be disengaged from the third locking groove 721 when the unlocking member 74 operates, and a first restoring spring 724 capable of transversely restoring the second spline 723 is disposed between the second spline 723 and the second connecting seat 211. When the unlocking is required, the unlocking piece 74 is operated, the unlocking piece 74 drives the second spline 723 to be separated from the third locking groove 721 on the third connecting seat body 311, at this time, the third connecting seat 31 is unlocked from the second connecting seat 21, and the third bracket 3 is unlocked from the second bracket.

As shown in fig. 11 to 13, the first locking component 71 includes a first locking groove 711 circumferentially disposed on the first outer connecting seat 112, a second locking groove 712 is circumferentially disposed on the second connecting seat 211 and on a side opposite to the first outer connecting seat 112, a first spline 713 capable of moving transversely and being engaged with the second locking groove 712 and the first locking groove 711 is disposed between the second connecting seat 211 and the first outer connecting seat 112, a second return spring 714 capable of returning the first spline 713 transversely is further disposed between the first spline 713 and the first outer connecting seat 112, and the linking member 73 includes a pushing column disposed on the second spline 723 and transversely penetrating through the second connecting seat 211 to push the first spline 713. When the unlocking piece 74 drives the second spline 723 to disengage from the third locking groove 721 on the third connecting seat body 311, the pushing column on the second spline 723 moving transversely pushes the first spline 713 to move transversely, the first spline 713 disengages from the second locking groove 712 on the second connecting seat body 211, at this time, the first connecting seat 11 unlocks from the second connecting seat 21, the first bracket 1 unlocks from the second bracket 2, at this time, the first bracket 1 can be rotated to make the first bracket 1 rotate to the second bracket 2 and approach, and at the same time, the third bracket 3 is brought to the second bracket 2 to fold.

As shown in fig. 11 to 13, the unlocking member 74 includes a pulling rope 741 connected to the second spline 723 and capable of pulling the second spline 723 to move transversely, a pushing block 742 capable of sliding downward to push the pulling rope 741 so that the pulling rope 741 pulls the second spline 723 is disposed in the first bracket 1, and a third return spring 743 capable of pushing the pushing block 742 to return is disposed between the pushing block 742 and the first bracket 1. When folding is required, the pushing block 742 is driven to slide downwards, the pushing block 742 pushes the pulling rope 741, so that the pulling rope 741 transversely pulls the second spline 723, so that the second locking component 72 is unlocked, and meanwhile, the pushing column on the second spline 723 pushes the first spline 713 to move, so that the first locking component 71 is unlocked. Therefore, the first locking component 71 and the second locking component 72 can be unlocked simultaneously only by sliding the pushing block 742 downwards, and the operation is simple and quick.

A child's vehicle comprises the transmission mechanism for the child's vehicle, wherein the lower end of the third support 3 is provided with a front wheel 32, the lower end of the second support 2 is provided with a rear wheel 22, and the first support 1 is connected with a hand push handle 8. When the child bicycle needs to be folded, the hand push handle 8 is firstly folded, and the hand push handle 8 is connected to the first support 1 in a sliding or rotating mode. The second locking assembly 72 and the first locking assembly 71 are then unlocked by the unlocking member 74 and the child car can then be folded by turning the first support 1. When the handle 8 is slidably connected to the first frame 1, the handle 8 can slide downward to fold and push the pushing block 742 to unlock. When the handle 8 is rotatably connected to the first frame 1, the pushing block 742 can be pulled to slide by the pulling cable wound around the fixed pulley structure or the second spline 723 can be pulled to slide by the pulling cable directly when the handle 8 is rotatably folded relative to the first frame 1.

As shown in fig. 6 to 13, the child car further includes a seat support 9 capable of being folded toward the third support 3, the seat support 9 includes a support frame 91, the rear end of the support frame 91 is rotatably connected to the protruding portion 312 on the third connecting seat 31, the third support 3 is rotatably connected to a transmission gear 92, a transmission rod 93 hinged to the eccentric position of the transmission gear 92 and the front end of the support frame 91 is disposed between the eccentric position of the transmission gear 92 and the front end of the support frame 91, and the second connecting seat 21 is further provided with a third tooth-shaped portion 94 which is engaged with the transmission gear 92 and can drive the seat support 9 to be folded toward the second support 2 through the transmission gear 92 when the third support 3 is rotated toward the second support 2. Because the transmission gear 92 is meshed with the third toothed part 94 on the second connecting seat 21, in the process that the third support 3 rotates and approaches to the second support 2, the transmission gear 92 can rotate relative to the third support 3, and because a transmission rod 93 hinged with the transmission gear 92 and the transmission gear 92 is arranged between the eccentric position of the transmission gear 92 and the front end position of the support 91, in the process that the transmission gear 92 rotates, the transmission rod 93 drives the support 91 to rotate relative to the convex part 312 and approach to the third support 3, so that the third support 3 can rotate and approach to the second support 2 and the seat support 9 can rotate and approach to the third support 3 at the same time as long as the first support 1 rotates relative to the second support 2, the operation is convenient and fast, and the design is ingenious.

As shown in fig. 6 to 13, a handle 95 for lifting the child car is provided at the rear end of the supporting frame 91, and a foldable seat assembly 96 is connected to the supporting frame 91. When the child's bike needs to be folded, the seat assembly 96 can be folded firstly, then the locking structure is unlocked, the first support 1 is rotated downwards, the lifting handle 95 is lifted upwards at last, and then the first support 1, the third support 3 and the seat support 9 can be folded to the second support 2. The folding seat assembly 96 may be a conventional folding seat assembly and will not be described in detail herein. Of course, the utility model discloses child's bike also can not set up seat support piece 9, but directly sets up flexible seat pocket on first support 1, and children take in the seat pocket.

Claims (10)

1. A drive mechanism for a child's vehicle, characterized by: including first support (1), second support (2) and third support (3), first support (1) on the fixed first connecting seat (11) that is equipped with, second support (2) on the fixed second connecting seat (21) that is equipped with, third support (3) on the fixed third connecting seat (31) that is equipped with, first connecting seat (11), second connecting seat (21) and third connecting seat (31) rotatable coupling each other and make first support (1), second support (2) and third support (3) can expand or fold, second connecting seat (21) on be equipped with its pivoted bevel gear (4) relatively, first connecting seat (11) on be equipped with along the circumferencial direction with bevel gear (4) meshing and can drive bevel gear (4) pivoted first profile of tooth portion (5) when first support (1) rotates to draw close together with second support (2) relatively, third connecting seat (31) on be equipped with along the circumferencial direction and drive bevel gear (4) rotation support (4) and can drive bevel gear (3) rotation and second support (3) to draw close together second profile of tooth support (6) rotation.

2. The drive mechanism for a child's vehicle of claim 1, characterized in that: the first connecting seat (11) comprises a first middle connecting seat (111) and first outer side connecting seats (112) which are arranged on two sides of the first middle connecting seat (111) and fixedly connected with the first support (1), the first middle connecting seat (111) and the first outer side connecting seats (112) are fixedly connected through a connecting shaft (12), a first connecting groove (113) is formed between the first middle connecting seat (111) and the first outer side connecting seats (112), the third connecting seat (31) comprises third connecting seat bodies (311) which are fixedly connected at the upper end of the third support (3) and are arranged at intervals, the third connecting seat bodies (311) are inserted into the first connecting groove (113) and are rotatably connected with the first connecting seat (11) through the connecting shaft (12), the second connecting seat bodies (21) comprise second connecting seat bodies (211) which are arranged at intervals, connecting parts (212) connected with the second connecting seat bodies (211) are arranged between the second connecting seat bodies (211), the bevel gears (4) are connected on the connecting parts (212), the second connecting seats (211) are inserted into the first connecting seat bodies (111) and are rotatably connected with the first connecting seat (12), and the third connecting seats (11) through a tooth-shaped connecting shaft (311), the second tooth-shaped part (6) is arranged on one of the third connecting seat bodies (311).

3. The drive mechanism for a child's vehicle of claim 2, characterized in that: a locking mechanical system for drive mechanism of perambulator including establishing first locking Assembly (71) between first outside connecting seat (112) and second connection pedestal (211) and establishing second locking Assembly (72) between pedestal (211) is connected with the third at second connection pedestal (211), second locking Assembly (72) and first locking Assembly (71) between be equipped with linkage (73) that can drive first locking Assembly (71) unblock when second locking Assembly (72) unblock, first support (1) in still be equipped with unlocking piece (74) that are used for unblock second locking Assembly (72).

4. The drive mechanism for a child's vehicle of claim 3, characterized in that: the second locking assembly (72) comprises a third clamping groove (721) formed in the third connecting seat body (311) along the circumferential direction, a second inner locking groove (722) is formed in the second connecting seat body (211) and on the side opposite to the third connecting seat body (311) along the circumferential direction, a second spline (723) capable of moving transversely and clamping with the third clamping groove (721) and the second inner locking groove (722) is arranged between the third connecting seat body (311) and the second connecting seat body (211), the unlocking piece (74) is connected with the second spline (723) so that the second spline (723) can be separated from the third clamping groove (721) when the unlocking piece (74) acts, and a first return spring (724) capable of transversely returning the second spline (723) is arranged between the second spline (723) and the second connecting seat body (211).

5. Transmission mechanism for children's vehicles according to claim 4, characterized in that: the first locking component (71) comprises a first clamping and locking groove (711) which is formed in the first outer side connecting seat (112) in the circumferential direction, a second clamping and locking groove (712) is formed in the second connecting seat body (211) and on the side opposite to the first outer side connecting seat (112) along the circumferential direction, a first spline (713) which can transversely move and can be clamped with the second clamping and locking groove (712) and the first clamping and locking groove (711) simultaneously is arranged between the second connecting seat body (211) and the first outer side connecting seat (112), a second return spring (714) which can transversely return the first spline (713) is further arranged between the first spline (713) and the first outer side connecting seat (112), and the linkage piece (73) comprises a pushing column which is arranged on the second spline (723) and transversely penetrates through the second connecting seat body (211) and can push the first spline (713).

6. The drive mechanism for a child's vehicle of claim 5, characterized in that: the unlocking piece (74) comprises a pull rope (741) which is connected with the second spline (723) and can pull the second spline (723) to transversely move, a pushing block (742) which can downwards slide to push the pull rope (741) to enable the pull rope (741) to pull the second spline (723) is arranged in the first support (1), and a third return spring (743) which can push the pushing block (742) to reset is further arranged between the pushing block (742) and the first support (1).

7. A child's vehicle, characterized in that: comprising a drive mechanism for a child's vehicle as claimed in any one of claims 1 to 6, said third frame (3) being provided at its lower end with front wheels (32), said second frame (2) being provided at its lower end with rear wheels (22), said first frame (1) being connected to a handlebar (8).

8. The child's vehicle of claim 7, wherein: child's bike still including can draw close folding seat support piece (9) to third support (3), seat support piece (9) including support frame (91), support frame (91) rear end and bulge (312) rotatable coupling on third connecting seat (31), third support (3) go up to rotate and are connected with drive gear (92), the eccentric position of drive gear (92) and the front end of support frame (91) between be equipped with two articulated transfer line (93), second connecting seat (21) on still be equipped with drive gear (92) meshing and can drive seat support piece (9) through drive gear (92) and draw close folding third portion (94) when third support (3) rotate to second support (2) and draw close the profile of tooth.

9. The child's vehicle of claim 8, wherein: the support frame (91) is connected with a foldable seat assembly (96).

10. The child's vehicle of claim 8, wherein: the hand push handle (8) is connected to the first support (1) in a sliding or rotating mode, and a handle (95) used for lifting the child car is arranged at the rear end of the support (91).

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