CN208911451U - Easily change Battery Card bassinet structure - Google Patents

Abstract

Battery Card bassinet structure is easily changed the utility model discloses a kind of comprising vehicle frame, headstock shell, vehicle body shell, driving device, transmission mechanism, battery pack, front component, wheel assembly, battery bracket and outer seat shell；Rear positions in headstock shell are equipped with interior seat shell, the back bottom of headstock shell is equipped with the insertion opening being connected with the bottom space of interior seat shell, vehicle body shell is put into opening equipped with corresponding with insertion opening by the one side wall of near-car head shell, the battery pack is put into opening and is inserted into the insertion opening, the outer seat cap closes on being put into opening, rationally it is equipped with interior seat shell and outer seat shell, and it is equipped with the insertion opening for making the two be connected and is put into opening, in effectively making full use of, the inner space of outer seat shell stores battery pack, when needing replacing battery, outer seat shell need to only be opened, it can carry out fetching battery group, it offers convenience to battery altering, and total tune is good, without rude sense, good appearance.

Description

Easily change Battery Card bassinet structure

Technical field

The utility model relates to toys, and in particular to a kind of easily to change Battery Card bassinet structure.

Background technique

With the development of economy, the raising of life, requirement of the people to toy is higher and higher, the vehicle then sold on the market Toy is varied, each there is different design concepts, makes every effort to the playability for Toy vehicle that can reach different players And the requirement of interest.Possessing a toy car is always the dream that each children is intended to possess, at present the full generation of toy car The annual output on boundary all reaches tens million of, and wherein the toy car of domestic production occupies dominant contribution.

The applicant has submitted one entitled " toy lorry " on July 11st, 2018, application No. is 201821092523.3 utility model patent comprising vehicle shell, shock-proof bicycle frame, driving device, transmission mechanism, front component and Wheel assembly, transmission mechanism include the first universal joint, the second universal joint, third universal joint, the 4th universal joint, the first cross axle and Second cross axle；Second universal joint is equipped with connecting cylinder, which is equipped with slip draw-in groove, the flexible slide bar of third universal joint On be radially provided with card column, be inserted into slip draw-in groove and limited by card column, and then prevented flexible slide bar and fallen out of connecting cylinder Occur as promoting transmission stability, long service life, high reliablity；Shock-proof bicycle frame carries out damping installation using damping shrapnel group, Relatively traditional multi-link structure, structure is more simple, is easily assembled, and it is small that front component and wheel assembly vibration are acted, Transmission stability can more be promoted；It is additionally provided with elongated fixing lug boss, it can the different tire of easy disassembly, such as round tire or sand ribbon wheel Deng to meet different road conditions driving requirements.But it still has improved space, if its battery is in shock-proof bicycle frame, so Charging is attached by power interface afterwards；Since charging needs to spend more time, for that can play the long period, player is usually pre- Multiple reserve batteries are had, battery altering is then carried out.Then existing battery is needed due to being located in the bottom surface of shock-proof bicycle frame The dismounting of whole vehicle shells could be replaced, made troubles to using, after replacing battery, and demand is ressembled, and it is very troublesome, both It is time-consuming and laborious, be also afraid of toy car to influence the interest of toy to ruining.

Summary of the invention

In view of the above deficiencies, the purpose of the utility model is to provide a kind of smart structural designs, reasonable, fast and easy Replacement battery easily changes Battery Card bassinet structure.

To achieve the above object, technical solution provided by the utility model is:

It is a kind of easily to change Battery Card bassinet structure comprising vehicle frame, headstock shell, vehicle body shell, driving device, transmission mechanism, battery Vehicle frame is accordingly arranged in group, front component, wheel assembly, battery bracket and outer seat shell, the front component and wheel assembly Forward and backward bottom position, the bottom middle position of vehicle frame is arranged in the driving device, and drives institute by transmission mechanism respectively Front component and wheel assembly rotation are stated, headstock cap closes on the head of vehicle frame, and the tail portion of vehicle frame, vehicle is arranged in the vehicle body shell Rear positions in head capsule are equipped with interior seat shell, and the back bottom of headstock shell is equipped with to be connected with the bottom space of interior seat shell Insertion opening, vehicle body shell are put into opening, the battery tray equipped with corresponding with insertion opening by the one side wall of near-car head shell The two sides of frame are equipped with support arm, and the lower end of the support arm is fixed on the vehicle frame, and the front end of battery bracket extends to insertion and opens Mouthful bottom surface, tail end extends to the bottom surface for being put into opening, and the battery pack is put into opening and is inserted into the insertion opening, and with it is described Driving device is connected, and the outer seat cap is closed forms outer seat on being put into opening.

As a kind of improvement of the utility model, two corner of front end of the battery bracket is installed before being symmetrically respectively provided with one Hole, screw pass through the bottom surface that the preceding mounting hole is screwed into headstock shell；It is installed after being symmetrically respectively provided with one in two corner of tail end of battery bracket Hole, screw pass through the bottom surface that the rear mounting hole is screwed into vehicle body shell.

As a kind of improvement of the utility model, there is a plurality of longitudinal raised line at the upper surface interval of the battery bracket side by side.

As a kind of improvement of the utility model, the top surface leading edge of the outer seat shell is equipped with plate, and in the vehicle body Shell is equipped with slot compatible with the plate, and the trailing flank bottom of the outer seat shell is equipped with fixed plate, sets in the fixed plate There is fixation hole, and be equipped with threaded hole corresponding with the fixation hole on the vehicle body shell, screw is threaded into across fixation hole Hole.

As a kind of improvement of the utility model, the front component includes steer-drive, steering linkage, linkage Bar, preceding bridge case, front drive gear group, front axle and two front pulley groups, front axle are arranged in preceding bridge case by bearing, the front-wheel The both ends of axis are stretched out from the both ends of preceding bridge case, and the medium position in preceding bridge case, and output end and institute is arranged in front drive gear group It states front axle to be connected, the input terminal of the front drive gear group is connected with the transmission mechanism, and the both ends of the preceding bridge case are living Dynamic to be respectively equipped with a steering base, the side of the steering base is equipped with elongated fixing lug boss, and two steering bases are connected by interlocking bar, One end of steering linkage is hingedly wherein on a steering base, and the driving swing arm of the other end and steer-drive is hinged, before two The installation wheel shaft of circle wheel is movably arranged on steering base, and is connected by universal joint with the front axle；Front pulley group includes The lower part of fixed wheel carrier, wheel belt, main pulley and several secondary pulleys, the fixed wheel carrier is equipped with installation position, the belt wheel of main pulley Axis is arranged on the installation position by bearing, and the end face of the pulley shaft is equipped with jack compatible with the front axle, the peace It fills position and is equipped with adaptation groove compatible with the elongated fixing lug boss towards one end of preceding bridge case, several secondary pulleys are distributed in fixation The lower rim position of wheel carrier, wheel belt pile warp main pulley and several secondary pulleys.

As a kind of improvement of the utility model, the wheel assembly include rear axle box, rear drive gear group, hind axle and Belt wheel group after two, hind axle are arranged in rear axle box by bearing, and the both ends of the hind axle are stretched out from the both ends of rear axle box, rear-guard The medium position in rear axle box is arranged in moving gear group, and output end is connected with the hind axle, the rear drive gear group Input terminal is connected with the transmission mechanism, and the both ends of the rear axle box are equipped with elongated fixing lug boss, and rear belt wheel group includes fixing Wheel carrier, wheel belt, main pulley and several secondary pulleys, the lower part of the fixed wheel carrier are equipped with installation position, and the pulley shaft of main pulley is logical It crosses bearing to be arranged on the installation position, the end face of the pulley shaft is equipped with jack compatible with the hind axle, the installation position It is equipped with adaptation groove compatible with the elongated fixing lug boss towards one end of rear axle box, several secondary pulleys are distributed in fixed wheel carrier Lower rim position, wheel belt pile warp main pulley and several secondary pulleys.

As a kind of improvement of the utility model, the transmission mechanism includes the first universal joint, the second universal joint, the 30000th Xiang Jie, the 4th universal joint, the first cross axle and the second cross axle, an end face of the first universal joint are equipped with driving shaft mounting hole, separately One end and the two end axles of the first cross axle are hinged, and one end of the second universal joint and the another two end axles of the first cross axle are hinged, The other end is equipped with connecting cylinder, and the barrel of the connecting cylinder is equipped with along its axially extending slip draw-in groove, one end of third universal joint Flexible slide bar compatible with the connecting cylinder, which protrudes into connecting cylinder, and radially sets in the flexible slide bar There is the card column protruded into the slip draw-in groove, the other end of third universal joint and the two end axles of the second cross axle are hinged, and the 4th One end of universal joint and the another two end axles of the second cross axle are hinged, and the other end is connected with the front component or wheel assembly It connects.

As a kind of improvement of the utility model, the driving device includes motor, tooth case, drive shaft, driving gear, One driven gear, the second driven gear and third driven gear, the motor are arranged in tooth case, and driving gear is fixed on motor Motor shaft on, drive shaft is movably arranged in tooth case, and the first driven gear is slidingly connected on the driving shaft, and with the active Gear is meshed, and third driven gear fixing sleeve is equipped in drive shaft, and second driven gear is arranged by shaft in tooth case It is interior, and be meshed respectively with first driven gear and third driven gear, the first universal joint passes through driving shaft mounting hole set It is located at the end of drive shaft.

The utility model has the following beneficial effects: the utility model smart structural design, is rationally equipped with interior seat shell and outer seat Chair shell, and be equipped with the insertion opening for making the two be connected and be put into opening, effectively make full use of the inside of inside and outside seat shell empty Between store battery pack, when needing replacing battery, only need to open outer seat shell, can carry out fetching battery group, more to battery It changes and offers convenience, and total tune is good, without rude sense, good appearance, two front pulley groups in front component are by interlocking bar Linkage, steer-drive drive wherein front pulley group rotation by steering linkage, can be linked by interlocking bar another Front pulley group rotates synchronously, and turning efficiency is good；It is additionally provided with elongated fixing lug boss, the different tire of energy easy disassembly, with full Driving requirements of the foot on different surfaces, function is more, effectively increases functional and children manipulative abilities and interest of playing.

With reference to the accompanying drawing with embodiment, the present invention will be further described.

Detailed description of the invention

Fig. 1 is structural representation Fig. 1 of the utility model.

Fig. 2 is structural representation Fig. 2 of the utility model.

Fig. 3 is structural representation Fig. 3 of the utility model.

Fig. 4 is structural representation Fig. 4 of the utility model.

Fig. 5 is structural representation Fig. 5 of the utility model.

Fig. 6 is the structural schematic diagram of battery bracket in the utility model.

Fig. 7 is the structural schematic diagram of front component in the utility model.

Fig. 8 is the structural schematic diagram of transmission mechanism in the utility model.

Fig. 9 is the structural schematic diagram of driving device in the utility model.

Specific embodiment

Embodiment, it is a kind of easily to change Battery Card bassinet structure referring to Fig. 1 to Fig. 9 comprising vehicle frame 1, headstock shell 2, vehicle body shell 3, Driving device 4, transmission mechanism 5, battery pack 6, front component 7, wheel assembly 8, battery bracket 9 and outer seat shell 10.

The forward and backward bottom position of vehicle frame 1, the driving device 4 is accordingly arranged in the front component 7 and wheel assembly 8 The bottom middle position of vehicle frame 1 is set, and the front component 7 and 8 turns of wheel assembly are driven by transmission mechanism 5 respectively Dynamic, the lid of headstock shell 2 closes on the head of vehicle frame 1, and the tail portion of vehicle frame 1, the rear positions in headstock shell 2 are arranged in the vehicle body shell 3 Equipped with interior seat shell 11, the back bottom of headstock shell 2 is equipped with the insertion opening 21 being connected with the bottom space of interior seat shell 11, Vehicle body shell 3 is put into opening 32, the battery bracket 9 equipped with corresponding with insertion opening 21 by the one side wall of near-car head shell 2 Two sides be equipped with support arm 95, the lower end of the support arm 95 is fixed on the vehicle frame 1, and the front end of battery bracket 9 extends to slotting Enter the bottom surface of opening 21, tail end extends to the bottom surface for being put into opening 32, and the battery pack 6 is put into 32 insertion of the opening insertion and opened Mouth 21, and be connected with the driving device 4, the outer lid of seat shell 10 is closed forms outer seat on being put into opening 32.

Referring to Fig. 6, mounting hole 91 before two corner of front end of the battery bracket 9 is symmetrically respectively provided with one, before screw passes through this Mounting hole 91 is screwed into the bottom surface of headstock shell 2；Mounting hole 92 after two corner of tail end of battery bracket 9 is symmetrically respectively provided with one, screw is worn Cross the bottom surface that the rear mounting hole 92 is screwed into vehicle body shell 3.Preferably, having side by side at the upper surface interval of the battery bracket 9 a plurality of Longitudinal raised line 93 reduces the contact area of battery pack and battery bracket 9, more conducively fetching battery group 6.It can also be in battery bracket 9 leading edge is equipped with baffle 94 and brings convenience conducive to the quick location and installation of battery pack 6 to using.

Referring to Fig. 3, be equipped with plate 101 in the top surface leading edge of the outer seat shell 10, and be equipped on the vehicle body shell 3 with The compatible slot 31 of plate 101, promotes compactness when assembly, and fitment stability is good.

The trailing flank bottom of the outer seat shell 10 be equipped with fixed plate 102, the fixed plate 102 be equipped with fixation hole, and The vehicle body shell 3 is equipped with threaded hole corresponding with the fixation hole, and screw passes through fixation hole and is threaded into hole, and then by outer seat 10 fixed closed of chair shell is put into opening 32 described.

Referring to Fig. 7, the front component 7 include steer-drive 71, steering linkage 72, interlocking bar 73, preceding bridge case 74, Front drive gear group, front axle and two front pulley groups 75, front axle are arranged in preceding bridge case 74 by bearing, and the two of the front axle End is stretched out from the both ends of preceding bridge case 74, and front drive gear group is arranged in the medium position in preceding bridge case 74, and output end with it is described Front axle is connected, and the input terminal of the front drive gear group is connected with the transmission mechanism 5, and the both ends of the preceding bridge case 74 are living Dynamic to be respectively equipped with a steering base 76, the side of the steering base 76 is equipped with elongated fixing lug boss 761, and two steering bases 76 pass through linkage Bar 73 is connected, and one end of steering linkage 72 is hingedly wherein on a steering base 76, the drive of the other end and steer-drive 71 Movable pendulum arm is hinged, and the installation wheel shaft 751 of two front pulley groups 75 is movably arranged on steering base 76, and by universal joint with it is described Front axle is connected；Front pulley group 75 includes fixing wheel carrier 752, wheel belt 753, main pulley 754 and several secondary pulleys 755, described The lower part of fixed wheel carrier 752 is equipped with installation position, and the pulley shaft 7541 of main pulley 754 is arranged on the installation position by bearing, The end face of the pulley shaft 7541 be equipped with jack 7542 compatible with the front axle, the installation position towards preceding bridge case 74 one End is equipped with adaptation groove 7521 compatible with the elongated fixing lug boss 761, and several secondary pulleys 755 are distributed in fixed wheel carrier 752 Lower rim position, 753 pile warp main pulley 754 of wheel belt and several secondary pulleys 755.

The wheel assembly 8 includes belt wheel group after rear axle box, rear drive gear group, hind axle and two, and hind axle passes through axis It holds and is arranged in rear axle box, the both ends of the hind axle are stretched out from the both ends of rear axle box, and rear drive gear group is arranged in rear axle box Medium position, and output end is connected with the hind axle, the input terminal of the rear drive gear group and 5 phase of transmission mechanism Connection, the both ends of the rear axle box are equipped with elongated fixing lug boss 761, if rear belt wheel group include fixed wheel carrier, wheel belt, main pulley and Dry secondary pulley, the lower part of the fixed wheel carrier are equipped with installation position, and the pulley shaft of main pulley is arranged by bearing in the installation position On, the end face of the pulley shaft is equipped with jack compatible with the hind axle, and one end of the installation position towards rear axle box is equipped with Adaptation groove compatible with the elongated fixing lug boss 761, several secondary pulleys are distributed in the lower rim position of fixed wheel carrier, take turns Band pile warp main pulley and several secondary pulleys.

The transmission mechanism 5 include the first universal joint 51, the second universal joint 52, third universal joint 53, the 4th universal joint 54, First cross axle 55 and the second cross axle 56, an end face of the first universal joint 51 are equipped with driving shaft mounting hole, the other end and first The two end axles of cross axle 55 are hinged, and one end of the second universal joint 52 and the another two end axles of the first cross axle 55 are hinged, another End is equipped with connecting cylinder 521, and the barrel of the connecting cylinder 521 is equipped with along its axially extending slip draw-in groove 522, third universal joint 53 One end flexible slide bar 531 compatible with the connecting cylinder 521, which protrudes into connecting cylinder 521, and Be radially provided with the card column 532 protruded into the slip draw-in groove 522 in the flexible slide bar 531, the other end of third universal joint 53 with The two end axles of second cross axle 56 are hinged, and one end of the 4th universal joint 54 and the another two end axles of the second cross axle 56 are hinged, The other end is connected with the front component 7 or wheel assembly 8.

The driving device 4 includes motor 41, tooth case 42, drive shaft 43, driving gear 44, the first driven gear 45, the Two driven gears 46 and third driven gear 47, the motor 41 are arranged in tooth case 42, and driving gear 44 is fixed on motor 41 Motor shaft on, drive shaft 43 is movably arranged in tooth case 42, and the first driven gear 45 is movably set in drive shaft 43, and with The driving gear 44 is meshed, and 47 fixing sleeve of third driven gear is equipped in drive shaft 43, and second driven gear 46 is logical It crosses shaft setting to be meshed in tooth case 42, and respectively with first driven gear 45 and third driven gear 47, the 10000th The end of drive shaft 43 is set in by 43 mounting hole of drive shaft to section 51.

When replacing battery, both make to be connected due to being rationally equipped with interior seat shell 11 and outer seat shell 10, and be equipped with Insertion opening 21 and it is put into opening 32, the inner space of interior seat shell 11 and outer seat shell 10 can be made full use of effectively to store electricity Pond group 6 when needing replacing battery, only need to open outer seat shell 10, can carry out fetching battery group 6, bring to battery altering It is convenient, and total tune is good, without rude sense, good appearance.

When driving, since the second universal joint 52 is equipped with connecting cylinder 521, the barrel of the connecting cylinder 521 is equipped with along its axis To the slip draw-in groove 522 of extension, 531 activity of flexible slide bar of third universal joint 53 is protruded into connecting cylinder 521, and the flexible slide bar It is radially provided with the card column 532 protruded into the slip draw-in groove 522 on 531, is limited by card column 532, and then has prevented to stretch Contracting slide bar 531 drops out phenomenon out of connecting cylinder 521, promotes transmission stability to enhance the performance of toy and improves toy Interest and attraction, and long service life, high reliablity；When steering, two front pulley groups 75 in front component 7 are by joining Lever 73 links, and steer-drive 71 drives a wherein front pulley group 75 rotation by steering linkage 72, can pass through connection Another front pulley group 75 that links of lever 73 rotates synchronously, and turning efficiency is good；It is additionally provided with elongated fixing lug boss 761, it can be convenient Different tires is dismounted, such as round tire or sand ribbon wheel easily change Battery Card bassinet structure on hard plane, Shamian Island or other surfaces to meet On driving requirements, function is more, effectively increases functional and children manipulative abilities and interest of playing.

According to the disclosure and teachings of the above specification, the utility model those skilled in the art can also be to above-mentioned reality The mode of applying is changed and is modified.Therefore, the utility model is not limited to specific embodiment disclosed and described above, right Some modifications and changes of the utility model should also be as falling into the protection scope of the claims of the present utility model.In addition, to the greatest extent It is used some specific terms in pipe this specification, these terms are merely for convenience of description, not to the utility model Constitute any restrictions, as described in the utility model above-described embodiment, using obtained from same or similar technique feature its Its toy car, in scope of protection of the utility model.

Claims (8)

1. a kind of easily change Battery Card bassinet structure comprising vehicle frame, headstock shell, vehicle body shell, driving device, transmission mechanism, battery pack, Front component and wheel assembly, it is characterised in that: it further includes battery bracket and outer seat shell, the front component and rear wheels The forward and backward bottom position of vehicle frame is accordingly arranged in part, and the bottom middle position of vehicle frame is arranged in the driving device, and leads to respectively It crosses transmission mechanism and drives the front component and wheel assembly rotation, headstock cap closes on the head of vehicle frame, and the vehicle body shell is set It sets the rear positions in the tail portion of vehicle frame, headstock shell and is equipped with interior seat shell, the back bottom of headstock shell is equipped with and interior seat shell The insertion opening that is connected of bottom space, vehicle body shell is equipped with put corresponding with insertion opening by the one side wall of near-car head shell Enter opening, the two sides of the battery bracket are equipped with support arm, and the lower end of the support arm is fixed on the vehicle frame, battery bracket Front end extends to the bottom surface of insertion opening, and tail end extends to the bottom surface for being put into opening, and the battery pack is put into described in opening insertion Insertion opening, and be connected with the driving device, the outer seat cap closes on being put into opening.

2. according to claim 1 easily change Battery Card bassinet structure, it is characterised in that: two corner of front end of the battery bracket Mounting hole before being symmetrically respectively provided with one, screw pass through the bottom surface that the preceding mounting hole is screwed into headstock shell；Two corner of tail end of battery bracket Mounting hole after being symmetrically respectively provided with one, screw pass through the bottom surface that the rear mounting hole is screwed into vehicle body shell.

3. according to claim 1 or 2 easily change Battery Card bassinet structure, it is characterised in that: the upper surface of the battery bracket There is a plurality of longitudinal raised line at interval side by side.

4. according to claim 1 easily change Battery Card bassinet structure, it is characterised in that: the top surface leading edge of the outer seat shell is set There is plate, and be equipped with slot compatible with the plate on the vehicle body shell, the trailing flank bottom of the outer seat shell is equipped with Fixed plate, the fixed plate are equipped with fixation hole, and threaded hole corresponding with the fixation hole, screw are equipped on the vehicle body shell Hole is threaded into across fixation hole.

5. according to claim 1 easily change Battery Card bassinet structure, it is characterised in that: the front component includes turning to driving Device, steering linkage, interlocking bar, preceding bridge case, front drive gear group, front axle and two front pulley groups, front axle are set by bearing It sets in preceding bridge case, the both ends of the front axle are stretched out from the both ends of preceding bridge case, during front drive gear group is arranged in preceding bridge case Portion position, and output end is connected with the front axle, the input terminal of the front drive gear group is connected with the transmission mechanism, The both ends activity of the preceding bridge case is respectively equipped with a steering base, and the side of the steering base is equipped with elongated fixing lug boss, and two turn to Seat is connected by interlocking bar, and one end of steering linkage is hingedly wherein on a steering base, the other end and steer-drive Driving swing arm is hinged, and the installation wheel shaft of circle wheel is movably arranged on steering base before two, and passes through universal joint and the front axle It is connected；Front pulley group includes preceding fixed wheel carrier, front-wheel band, preceding main pulley and several preceding secondary pulleys, fixed wheel carrier before described Lower part is equipped with installation position, and the pulley shaft of preceding main pulley is arranged on the installation position by bearing, and the end face of the pulley shaft is equipped with Jack compatible with the front axle, the installation position are equipped with towards one end of preceding bridge case and mutually fit with the elongated fixing lug boss The adaptation groove matched, the lower rim position of several preceding secondary pulleys fixed wheel carrier before being distributed in, if front-wheel band around premenstrual main pulley and Secondary pulley before dry.

6. easily changing Battery Card bassinet structure according to claim 1 or 5, it is characterised in that: the wheel assembly includes rear axle Belt wheel group after case, rear drive gear group, hind axle and two, hind axle are arranged in rear axle box by bearing, and the two of the hind axle End is stretched out from the both ends of rear axle box, and the medium position in rear axle box, and output end and the rear-wheel is arranged in rear drive gear group Axis is connected, and the input terminal of the rear drive gear group is connected with the transmission mechanism, and the both ends of the rear axle box are equipped with elongated Fixing lug boss, rear belt wheel group fix wheel carrier, rear-wheel band, rear main pulley and several rear secondary pulleys, fixed wheel carrier after described after including Lower part be equipped with installation position, through bearing setting on the installation position, the end face of the pulley shaft is set for the pulley shaft of rear main pulley There is jack compatible with the hind axle, the installation position is equipped with and the elongated fixing lug boss phase towards one end of rear axle box The adaptation groove of adaptation, it is several after secondary pulleys be distributed in after fix the lower rim position of wheel carrier, after rear-wheel band pile warp main pulley and Secondary pulley after several.

7. according to claim 1 easily change Battery Card bassinet structure, it is characterised in that: the transmission mechanism includes first universal Section, the second universal joint, third universal joint, the 4th universal joint, the first cross axle and the second cross axle, an end face of the first universal joint Equipped with driving shaft mounting hole, the two end axles of the other end and the first cross axle are hinged, one end of the second universal joint and the first cross The another two end axles of axis are hinged, and the other end is equipped with connecting cylinder, and the barrel of the connecting cylinder is equipped with along its axially extending sliding card Slot, one end of third universal joint flexible slide bar compatible with the connecting cylinder, the flexible slide bar activity are protruded into connecting cylinder, and It is radially provided with the card column protruded into the slip draw-in groove in the flexible slide bar, the other end of third universal joint and the second cross axle Two end axles are hinged, and one end of the 4th universal joint is hinged with the another two end axles of the second cross axle, the other end and the front wheels Part or wheel assembly are connected.

8. according to claim 7 easily change Battery Card bassinet structure, it is characterised in that: the driving device includes motor, tooth Case, drive shaft, driving gear, the first driven gear, the second driven gear and third driven gear, the motor are arranged in tooth case Interior, driving gear is fixed on the motor shaft of motor, and drive shaft is movably arranged in tooth case, and the first driven gear is movably set in It in drive shaft, and is meshed with the driving gear, third driven gear fixing sleeve is equipped in drive shaft, second driven tooth Wheel is arranged by shaft to be meshed in tooth case, and respectively with first driven gear and third driven gear, and first is universal Section is by driving shaft mounting hole to be set in the end of drive shaft.