CN211494350U - Combined riding carrying vehicle pulled by self-balancing vehicle - Google Patents

Abstract

The utility model discloses a combination formula of pulling by self-balancing car is ridden and is carried thing car belongs to small-size short distance conveyer, including the two-wheeled self-balancing car that provides traction force and as carrying the pull rod car of thing device. The pull rod vehicle is connected with the double-wheel self-balancing vehicle through a connecting device. The utility model discloses a two-wheeled self-balancing car drives the pull rod car motion is ridden by the user, and the article of placing the user on the pull rod car pull the destination to provide convenience and life enjoyment for the user.

Description

Combined riding carrying vehicle pulled by self-balancing vehicle

Technical Field

The utility model relates to a small-size short distance conveyer especially relates to a combination formula conveyer that is pull by self-balancing car.

Background

Generally, people often need to increase assistance when shopping or carrying goods for a short time, and an effective and interesting carrying and walking mode is generally accepted by people.

The appearance of the trolley effectively relieves the fatigue of carrying the shoulder bars when people carry objects for a short distance to walk, but the stress of the human body is extremely unbalanced when people carry the trolley, and the trolley is pulled up and is very hard when the objects are carried more.

In recent years, the balance car has become a big spot in the market, but most of the balance cars are used as children toys and young people transportation tools. With the increasing updating of functions, the vehicle type with the object carrying function is recently developed, but the vehicle type is a double-wheel self-balancing vehicle with the automatic following function, and the vehicle type cannot be ridden when carrying objects. Because the carrying mode is that a purpose-made hollow carrying basket is sleeved around a leg control rod and is erected on a handle of the leg control rod, the carried articles need to be placed uniformly to ensure the stability of the self-balancing vehicle, the carrying weight is limited (generally 20 kg), once the weight is over-limited, the self-balancing vehicle enters a riding state and is out of control, when the self-balancing vehicle is far away from the riding state, the self-balancing vehicle is often unstable and shakes due to uneven carrying placement or goods displacement caused by inertia, and when the self-balancing vehicle exits from an automatic following mode, the self-balancing vehicle can move automatically and uncontrollably due to unbalanced stress. Therefore, the carrying mode is still unsatisfactory, and the existing riding self-balancing bicycle does not have the carrying function. The bicycle is ridden by holding heavy objects, but the bicycle is not a convenient method after all.

Then, can not be able to connect the carrying trolley with the two-wheel self-balancing vehicle, and ride and drive the carrying trolley to travel?

SUMMERY OF THE UTILITY MODEL

The purpose of the utility model is to solve the technical problem through the following technical scheme: a combined riding carrying vehicle pulled by a self-balancing vehicle comprises a double-wheel self-balancing vehicle providing traction force, a pull rod vehicle assembled with a single beam connecting rod, a fisheye rod end joint bearing, a thrust ball bearing or a diamond seat outer spherical bearing and the like serving as carrying devices, and a balance shaft installed on the double-wheel self-balancing vehicle, and is characterized in that a vertical shaft which is used for providing a connecting point for the pull rod vehicle, is perpendicular to the central balance point of the whole plane of the double-wheel self-balancing vehicle pedal and can move upwards and downwards, namely the balance shaft, is established above the center of the double-wheel self-balancing vehicle pedal at a space position with the approximate height of a handle beam when the pull rod vehicle is inclined and moves forwards, the single beam connecting rod of the pull rod vehicle is connected to the balance shaft sleeved with the thrust ball bearing of the double-wheel self-balancing vehicle through the fisheye rod end joint bearing installed at the front end of the single beam connecting rod of the pull rod vehicle, or the single shaft connecting rod of the pull rod car is connected with a rhombic seat outer spherical bearing sleeved on the balance shaft, the connected double-wheel self-balancing car is always kept in a non-contact state with any other part of the pull rod car except for the connecting point of the balance shaft of the double-wheel self-balancing car and the fisheye rod end joint bearing, and the balance shaft is established on a position meeting the requirement through a supporting device arranged on the double-wheel self-balancing car.

Alternatively, the balance shaft can be mounted on a leg control rod handle of the double-wheel self-balancing vehicle provided with the leg control rod, such as welding or punching mounting.

Alternatively, when the double-wheel self-balancing vehicle does not have a supporting device such as a leg lever, the balance shaft is built on a pillar or a crank arm specially installed for the balance shaft according to the principle.

Optionally, when the double round self-balancing car installs the leg control lever handle, just the handle side have run through both sides enclose the space, the handle top have with enclose when enclosing the communicating vertical dead slot in space, can with the balance shaft is installed on supplementary mounting, will again supplementary mounting is fixed in the space and the vertical dead slot that enclose of leg control lever handle.

Preferably, the auxiliary fixing part comprises an upper auxiliary fixing part and a lower auxiliary fixing part, and the balance shaft is mounted on the upper auxiliary fixing part; the lower part auxiliary fixing piece is fixed in the space that encloses that two round self-balancing car leg control lever handle runs through both sides, the upper portion auxiliary fixing piece of installing the balance shaft imbeds the vertical dead slot of leg control lever handle top with expose the laminating of the lower part auxiliary fixing piece top in the vertical dead slot scope is fixed, for making things convenient for the dismouting upper and lower auxiliary fixing piece is close to the corresponding position perforation at both ends, installs embedded nut in the perforation of lower part auxiliary fixing piece to twist the bolt fastening with the hand upper and lower auxiliary fixing piece.

Preferably, a single-beam connecting rod corresponding to a single-beam carriage beam and extending forwards above the frame is mounted on the main vertical surface frame of the draw bar, the single-beam connecting rod is rigidly connected with the draw bar, namely the single-beam connecting rod has no movement room relative to the main vertical surface frame of the draw bar, and the front end of the single-beam connecting rod is provided with a thread for connecting a rod end joint bearing of a fisheye.

Preferably, the balance shaft is provided with a thread, an axis sleeve which is shorter than the balance shaft and provides a smooth axis is sleeved on the balance shaft, when the balance shaft is mounted upwards, a gasket, a support sleeve, a thrust ball bearing and an SI internal thread fisheye rod end joint bearing screwed at the front end of the single-beam connecting rod of the trolley are sequentially sleeved on the axis sleeve from bottom to top, a nut device is mounted on the balance shaft thread exposed above the axis sleeve to limit the upward movement of the fisheye rod end joint bearing, and when the balance shaft is mounted downwards, the axis sleeve is sequentially sleeved with the SI internal thread fisheye rod end joint bearing screwed at the front end of the single-beam connecting rod of the trolley, the thrust ball bearing, the gasket and an anti-falling nut from top to bottom.

Optionally, the fisheye rod end joint bearing connected to the front end of the single-beam connecting rod of the pull rod can be replaced between the SI inner teeth and the SA outer teeth as required, the fisheye rod end joint bearing of the SI inner teeth can be directly screwed on the thread at the front end of the single-beam connecting rod of the pull rod, and the fisheye rod end joint bearing of the SA outer teeth can be butted with the front end of the single-beam connecting rod of the pull rod through a butt nut.

Optionally, when the self-balancing vehicle naturally has a vertical shaft assembly which can be used as a balancing shaft, the pull rod vehicle can be directly installed by using the connection of the vertical shaft assembly, if the self-balancing vehicle is not suitable for being connected by using the fisheye rod end joint bearing, the rhombic seat outer spherical bearing can be sleeved on the vertical shaft assembly which is used as the balancing shaft, an SA outer tooth fisheye rod end joint bearing which can rotate in a hole is inserted and fixed in a round hole at one end of the rhombic seat outer spherical bearing, a bolt with a cap is inserted into a shaft hole of the fisheye rod end joint bearing, and the bolt which passes through the shaft hole is butted with the single-shaft connecting rod of the pull rod vehicle by using a butt nut.

Optionally, a method of connecting the two-wheel self-balancing vehicle and the pull rod vehicle single beam connecting rod by using a diamond-shaped seat spherical outside surface bearing is also applicable to other examples.

The utility model discloses following beneficial effect has: the utility model discloses a by the towed combination formula of self-balancing car ride and carry thing car drives through the two-wheeled self-balancing car pull rod car motion rides by the user, places the article on the pull rod car with the user and pulls the destination to provide convenience and life enjoyment for the user. The utility model discloses on children's toys and the basis of young person's instrument of riding instead of walk, expanded the service function of two rounds of self-balancing cars. In addition, the object carrying load is mainly placed on the wheels of the pull rod vehicle due to the fact that the pull rod vehicle is used for carrying objects, and the pressure transmitted to the double-wheel self-balancing vehicle by the pull rod vehicle is extremely limited, so that the upper limit of the weight of the object carrying is greatly improved; because the pull rod car transmits for the pressure of two rounds of self-balancing cars only passes through the balance shaft falls on the balance point of two rounds of self-balancing cars, so no matter how change or how put of article weight in the pull rod car or on the constraint, as long as the pull rod car can guarantee self steady, just can guarantee the gesture stability of two rounds of self-balancing cars with the combination formula carries the steady traveling of thing car.

Drawings

Fig. 1 is a schematic view of the overall structure of the combined riding carrying vehicle drawn by the self-balancing vehicle of the present invention;

FIG. 2 is a schematic view of the mounting principle of the balance shaft of the present invention;

fig. 3 is a schematic view of the direct installation of the balance shaft on the handle of the double-wheel self-balancing scooter and the connection sequence between the balance shaft and the pull rod scooter;

FIG. 4 is a schematic structural view of the balance shaft-mounted auxiliary fixing member and a two-wheel self-balancing leg lever handle type suitable for mounting the auxiliary fixing member of the present invention;

fig. 5 is a schematic view of the decomposition structure and the combination method of the auxiliary fixing member of the present invention, wherein: 1 is an upper auxiliary fixing piece, 2 is a lower auxiliary fixing piece, and 3 is a long bolt with a cap used as a balance shaft;

fig. 6 is a schematic view illustrating the sequence of the auxiliary fixing member of the present invention being mounted on the handle of the two-wheel self-balancing leg control lever;

fig. 7 is a schematic view of the installation position of the single-shaft connecting rod (and optional bluetooth speaker) of the trolley of the present invention;

fig. 8 is a schematic view showing the connection sequence of the single-shaft connecting rod of the pull rod car and the balance shaft according to the present invention;

fig. 9 is a schematic view of the connection sequence of the present invention when the balance shafts are installed upward and downward, respectively;

fig. 10 is a schematic view of the connection sequence of the trolley and the balance shaft using the spherical outside bearing with diamond seats for a self-balancing trolley type having a natural vertical shaft assembly that can be used as a balance shaft according to the present invention;

FIG. 11 is a schematic view of the utility model in riding;

Detailed Description

The technical solution of the present invention will be further explained with reference to the following embodiments and accompanying drawings.

Example 1

The embodiment provides a combined riding carrying vehicle pulled by a self-balancing vehicle, which comprises a double-wheel self-balancing vehicle for providing traction force and a pull rod vehicle serving as a carrying device, wherein the pull rod vehicle is connected with the double-wheel self-balancing vehicle through a connecting device (see fig. 1).

This embodiment passes through the two-wheeled self-balancing car drives the motion of trolley, is ridden by the user, drags the destination with the article that the user placed on trolley to provide convenience and life enjoyment for the user.

In this embodiment, the trolley is a vehicle with two wheels landing during traveling, and the friction force is small relative to the ground. In order to achieve the stability of the two-wheel self-balancing vehicle before riding, so as to facilitate the user to get on the vehicle, the force applied by the pull rod vehicle to the two-wheel self-balancing vehicle in this embodiment can only have downward pressure, and this pressure must fall in the balance point area of the two-wheel self-balancing vehicle. Therefore, the trolley needs to be connected on a vertical line perpendicular to the central balance point of the overall plane of the pedals at a proper height above the pedals of the double-wheel self-balancing trolley in an approximate point connection mode. For this purpose, it is necessary to establish a vertical axis perpendicular to the central balance point of the overall plane of the tread, at a suitable height of said perpendicular line (see fig. 2, 3), which we may simply (but not necessarily exactly) refer to as "balance axis".

In this embodiment, the two-wheeled self-balancing vehicle is provided with a leg control lever handle, a space penetrating through both sides is formed in the side surface of the handle, and a longitudinal empty groove communicated with the space is formed above the handle (see fig. 4).

In this embodiment, the balance shaft is mounted on an auxiliary fixing member, and the auxiliary fixing member is fixed in the enclosed space and the longitudinal hollow groove of the leg control lever handle (see fig. 4).

Preferably, the auxiliary fixing member includes an upper auxiliary fixing member and a lower auxiliary fixing member (see fig. 5).

Preferably, the balance shaft is mounted on the upper auxiliary fixing member; the lower auxiliary fixing piece is fixed in a space which is formed by penetrating through two sides of a handle of the double-wheel self-balancing bicycle leg control rod, the upper auxiliary fixing piece provided with the balancing shaft is embedded into a longitudinal empty groove above the handle of the leg control rod, and is fixedly attached to the top of the lower auxiliary fixing piece exposed in the range of the longitudinal empty groove (see fig. 6).

Preferably, after the lower auxiliary fixing piece is installed in place, the part of the top of the lower auxiliary fixing piece, which is exposed in the range of the longitudinal empty slot above the leg control rod handle, is a plane, and therefore, on the upward-protruding curved surface at the top of the lower auxiliary fixing piece (the cross section of the existing double-wheel self-balancing vehicle leg control rod handle, which penetrates through the space enclosed by the two sides, is basically similar to an ellipse, and correspondingly, the top of the lower auxiliary fixing piece is the upward-protruding curved surface), and the part of the lower auxiliary fixing piece, which is exposed in the range of the longitudinal empty slot of the leg control rod handle, are provided with the longitudinal groove of which the bottom is a plane, the center of the plane of the longitudinal groove is a circular groove, two vertical holes are respectively arranged near the two ends.

Preferably, the auxiliary fixing member for mounting the balance shaft has a convex side surface and a rectangular bottom surface, and a hole penetrating through the upper and lower sides and perpendicular to the bottom surface is formed in a connection line between the center of the bottom surface and the center of the top surface, i.e., the center of the protruding portion, and an embedded nut is mounted in the hole, the balance shaft is a longer bolt with a cap, the embedded nut is screwed in from the center of the bottom of the auxiliary fixing member, and penetrates out from the center of the top of the protruding portion to expose a proper length, the nut is exposed at the bottom, and through holes perpendicular to the bottom surface are formed in short planes on the front side and the rear side of the protruding portion (see fig. 5).

Preferably, the upper auxiliary fixing member with the balance shaft is inserted and attached to the lower auxiliary fixing member only by aligning the nuts exposed at the bottom of the upper auxiliary fixing member with the circular grooves at the center of the longitudinal groove plane of the lower auxiliary fixing member, and at this time, the through holes formed in the front and rear short planes of the upper auxiliary fixing member are exactly aligned with the embedded nuts at the two ends of the longitudinal groove at the top of the lower auxiliary fixing member, and when two hand-screwed bolts are inserted into the through holes in the front and rear short planes of the upper auxiliary fixing member and are screwed with the embedded nuts at the two ends of the longitudinal groove of the lower auxiliary fixing member, an upward vertical shaft extending from the center of the protruding portion of the upper auxiliary fixing member, forming a whole with the dual-wheel self-balancing vehicle, and being substantially perpendicular to the center balance point of the whole plane of the pedal, i.e. the balance shaft, after the auxiliary fixing piece is installed, the top of the convex part of the upper auxiliary fixing piece is higher than the upper edge of the leg control rod handle, and the top of the hand-screwed bolt is lower than the upper edge of the leg control rod handle (see fig. 6).

Preferably, the lateral section of the lower auxiliary fixing part is basically the same as the shape of the section of the space enclosed by the leg control rod handle penetrating through two sides; the longitudinal length of the lower auxiliary fixing part is basically the same as the width of the section of the leg control rod handle penetrating through the space enclosed by the two sides; the transverse width of the lower auxiliary fixing part is basically the same as that of the leg control rod handle; the longitudinal length of the upper auxiliary fixing part is basically the same as that of the lower auxiliary fixing part; the transverse width of the upper auxiliary fixing part is basically the same as the width of the longitudinal empty groove of the leg control rod handle.

In this embodiment, when the lower auxiliary fixing member is inserted into the leg lever handle and penetrates through the enclosed spaces on both sides, the possibility that the lower auxiliary fixing member moves in the front-back direction, the up-down direction and the like due to stress is limited;

when the upper auxiliary fixing piece is embedded into the longitudinal empty groove above the leg control rod handle, the possibility of the upper auxiliary fixing piece moving transversely due to stress is limited;

after the upper auxiliary fixing piece embedded into the longitudinal empty groove above the leg control rod handle is attached and fixed with the lower auxiliary fixing piece inserted into the leg control rod handle and penetrating through the space enclosed by two sides, the auxiliary fixing piece provided with the balance shaft can be limited relative to the leg control rod handle in any direction, and at the moment, the balance shaft becomes a stable part of the double-wheel self-balancing vehicle.

Before formal use, the relationship between the balance shaft and the balance point should be subjected to test adjustment:

and (3) uniformly placing a test object with a certain weight on the mounted balance shaft, wherein the test object is not in contact with other parts of the double-wheel self-balancing vehicle. After the machine is started, if the position of the balance shaft is deviated, the double-wheel self-balancing vehicle can move in the front-back direction (limited by a narrow longitudinal empty groove above the handle of the leg control rod, the possibility of transverse deviation in the installation of the balance shaft is not large, and the tolerance of the balance of the double-wheel self-balancing vehicle in the transverse direction is large), at the moment, the balance point is adjusted by using the mobile phone APP, and when the double-wheel self-balancing vehicle is tested, the balance shaft can be used.

In this embodiment, the single-shaft connecting rod (see fig. 7) bent forward above the main vertical surface frame of the trolley needs to have a certain length, which has two functions: one is that the reasonable distance between the pull rod vehicle and the double-wheel self-balancing vehicle is limited, so that the two wheels do not contact with each other except the connection point on the balancing shaft, and the double-wheel self-balancing vehicle is ensured not to move passively due to the accidental force application of the pull rod vehicle; secondly, when riding, the pull rod vehicle frame does not influence the standing of a user on the double-wheel self-balancing vehicle (when riding the combined carrier vehicle, the situation that the turning radius is too small, especially the turning at a fixed point cannot be avoided). However, the single-shaft connecting rod is not too long, so that the rotary passing capability and the degree of freedom of the combined carrying vehicle are affected due to the overlong whole body.

In this embodiment, preferably, the main connecting piece between the pull rod and the single shaft connecting rod and the balance shaft is a SI inner tooth fisheye rod end joint bearing.

Optionally, the main connecting piece of the pull rod car single beam connecting rod and the balance shaft can be replaced freely between the SI inner teeth and the SA outer teeth according to requirements, the SI inner teeth fisheye rod end joint bearing can be directly screwed on the thread at the front end of the pull rod car single beam connecting rod, and the SA outer teeth fisheye rod end joint bearing can be butted with the front end of the pull rod car single beam connecting rod through a butt nut.

Preferably, the balance shaft is sleeved with a sleeve pipe providing a smooth axis,

preferably, the axle center sleeve is sequentially sleeved with a gasket, a sleeve serving as a support seat (having an effect of raising the single-beam connecting rod so as to prevent a leg control rod handle of the double-wheel self-balancing vehicle from touching the single-beam connecting rod during tilting motion), and a thrust ball bearing for providing horizontal rotational freedom for the fisheye rod end joint bearing, wherein the fisheye rod end joint bearing is sleeved on a support surface of the thrust ball bearing (see fig. 8).

The fisheye rod end joint bearing is selected because after the fisheye rod end joint bearing is sleeved on the balance shaft, a screw rod of the fisheye rod end joint bearing can rotate in the horizontal direction by taking a head bearing connected to the balance shaft as an axis, namely the balance shaft as an axis, and can also lift up and down by taking a spherical surface of a rod end spherical bearing as an axis, which just meets the requirement that the two-wheel self-balancing vehicle needs to make posture adjustment of vehicle body forward and backward swinging so as to implement driving when the two-wheel self-balancing vehicle walks.

The reason why the lower surface of the fisheye rod end joint bearing is received by the thrust ball bearing and provides the fisheye rod end joint bearing with horizontal rotation freedom is that when the fisheye rod end joint bearing is lifted up and down to different degrees, the part and the shape of the fisheye rod end joint bearing pressed on the receiving surface are different, the friction force between the fisheye rod end joint bearing and the receiving surface is also different, and if the receiving surface cannot rotate or rotates unsmoothly, the fisheye rod end joint bearing may be blocked on the receiving surface, so that the flexibility and the smoothness of walking of the fisheye rod end joint bearing are affected. The thrust ball bearing can integrally and flexibly rotate from the bearing surface to the bearing surface side edge, so that the smooth movement of the fisheye rod end joint bearing can be ensured, and the smooth walking of the combined loading vehicle is ensured.

Preferably, on the balance shaft screw thread that the balance shaft axle center sleeve pipe top exposes, install nut device to the restriction the upwards motion of fisheye rod end joint bearing, nut device can be ordinary nut, spherical hand screw nut or plum blossom hand screw nut, possess the nut device of handle shape and function etc..

After the connection is completed, the combined riding carrying vehicle drawn by the self-balancing vehicle can be used (see fig. 11).

Example 2

In this embodiment, the balance shaft is installed downward. At this time, for the downward installation of the balance shaft, the shaft center sleeve is sequentially sleeved with a SI inner thread fisheye rod end joint bearing, a thrust ball bearing, a gasket and a falling-off prevention nut (see fig. 9(2)) which are screwed on the front end of the single shaft connecting rod of the pull rod car from top to bottom.

Example 3

For a self-balancing vehicle which naturally has a vertical shaft assembly capable of being used as a balance shaft, the pull rod vehicle can be directly installed by utilizing the connection of the vertical shaft assembly, and if the connection is not suitable for using a fisheye rod end joint bearing, a diamond seat outer spherical bearing can be sleeved on the vertical shaft assembly used as the balance shaft and connected with a single beam connecting rod of the pull rod vehicle.

In this embodiment, the double round self-balancing car is a stand-sit dual-purpose self-balancing car of riding. The standing and sitting dual-purpose riding self-balancing bicycle naturally has a vertical shaft-shaped assembly which can be used as a balancing shaft. The saddle is fixed by a quick-release device, the height can be conveniently disassembled or adjusted, a cylindrical pipe which is used for being fixed in a leg control rod column hole and has a certain length is arranged below the saddle, the shape and the position of the cylindrical pipe meet the requirements of serving as a balance shaft, and the cylindrical pipe can be used as the balance shaft;

aiming at the shaft diameter and the position of the cylindrical pipe used as the balance shaft, a diamond-base spherical outside surface bearing is sleeved on the cylindrical pipe, a fisheye joint capable of rotating in the through hole is fixed through a through hole at one end of the diamond-base spherical outside surface bearing, a cap-provided bolt with the same diameter as the fisheye joint penetrates through a shaft hole of the fisheye joint and is connected with the front end of a connecting rod of the trolley with a thread by a hexagonal joint nut (see figure 10, wherein 1 is the cylindrical pipe which can be used as the balance shaft below a saddle, 2 is a quick-release device, 3 is the diamond-base spherical outside surface bearing, 4 is an SA external-tooth fisheye rod end joint bearing and can be shortened if necessary, and 8 is an axis sleeve pipe).

The sequence of the above embodiments is only for convenience of description and does not represent the advantages and disadvantages of the embodiments.

The combined riding carrying vehicle towed by the self-balancing vehicle in the embodiment develops a potential vehicle pulling function of the double-wheel self-balancing vehicle, and the function is proved to be convenient to realize, smooth to use and excellent in technical effect through material experiments, and the existence of the towing trolley can not be sensed basically during riding.

It should be noted that, because the pull rod vehicle is connected, a certain obstacle is caused to the conventional mode of getting on and off the vehicle during riding, the problem that the user can get on the vehicle by lifting the legs from the side rear part is solved, but the user seems that the user cannot get off the vehicle by lifting the legs from the rear part conveniently and safely. So the utility model discloses the mode of getting off of suggestion is the place ahead. Although the place ahead is got off and is the mode of getting off of proposing to stop in general self-balancing car description, nevertheless pass through the utility model discloses inventor's long-time probation, the back car place ahead of stopping steadily is gently stepped leg and is got off, and when getting off, the back leg is crooked slightly, and when falling to the ground the leg stand after steady, slightly receive the back leg, can realize very steady getting off.

In addition, after the two-wheel self-balancing vehicle is connected with the pull rod vehicle, some measure can be taken to prevent the free rotation of the fisheye rod end joint bearing relative to the single-beam connecting rod (for example, a SI inner-thread fisheye rod end joint bearing with a fixed thread inner bolt device is adopted), so as to prevent the accidental overturn due to the accidental bumping caused by the overlarge degree of freedom of the single-beam connecting rod relative to the two-wheel self-balancing vehicle connecting point of the pull rod vehicle. Namely, the stable standing of the pull rod vehicle is maintained by the stable standing of the double-wheel self-balancing vehicle.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. A combined riding carrying vehicle pulled by a self-balancing vehicle comprises a double-wheel self-balancing vehicle for providing traction force, a pull rod vehicle assembled with a single beam connecting rod, a fisheye rod end joint bearing and a thrust ball bearing or a rhombic seat outer spherical bearing as a carrying device, and a balance shaft installed on the double-wheel self-balancing vehicle, and is characterized in that a vertical shaft which is used for providing a connecting point for the pull rod vehicle and is vertical to a balance point of the whole plane center of a pedal of the double-wheel self-balancing vehicle and can move upwards and downwards, namely the balance shaft, is established above the center of the pedal of the double-wheel self-balancing vehicle at a spatial position which is approximately as high as a handle lifting beam when the pull rod vehicle inclines forwards, the single beam connecting rod of the pull rod vehicle is connected to the balance shaft sleeved with the thrust ball bearing of the double-wheel self-balancing vehicle through the fisheye rod end joint bearing installed at the front end, or the single shaft connecting rod of the pull rod car is connected with a rhombic seat outer spherical bearing sleeved on the balance shaft, the connected double-wheel self-balancing car is always kept in a non-contact state with any other part of the pull rod car except for the connecting point of the balance shaft of the double-wheel self-balancing car and the fisheye rod end joint bearing, and the balance shaft is installed on the double-wheel self-balancing car through a supporting device.

2. The combination riding carrying vehicle towed by the self-balancing vehicle of claim 1, wherein the balance shaft is mounted on a leg lever handle.

3. The modular riding carrier vehicle towed by a self-balancing vehicle of claim 1, wherein said balancing shafts are built on struts or crank arms specifically mounted thereto.

4. The combined riding carrying vehicle pulled by the self-balancing vehicle of claim 1, wherein the double-wheel self-balancing vehicle is provided with a leg control rod with a handle, the handle of the leg control rod is provided with a space which runs through two sides and is enclosed, a longitudinal empty slot which is communicated with the enclosed space is arranged above the handle, the balancing shaft is arranged on an auxiliary fixing piece, and then the auxiliary fixing piece is fixed in the enclosed space and the longitudinal empty slot of the handle of the leg control rod.

5. The combined riding carrying vehicle pulled by the self-balancing vehicle of claim 4, wherein the auxiliary fixing member is composed of an upper auxiliary fixing member and a lower auxiliary fixing member, the balancing shaft is installed on the upper auxiliary fixing member, the lower auxiliary fixing member is inserted into a space which is formed on the leg control rod handle and penetrates through two sides of the leg control rod handle, the upper auxiliary fixing member with the balancing shaft is embedded into a longitudinal empty groove above the leg control rod handle and is attached and fixed with the top of the lower auxiliary fixing member exposed in the range of the longitudinal empty groove, corresponding positions of the upper and lower auxiliary fixing members close to two ends are perforated, embedded nuts are installed in the perforated holes of the lower auxiliary fixing member for facilitating disassembly and assembly, and the upper and lower auxiliary fixing members are fixed by screwing bolts with hands.

6. The combined riding and carrying vehicle drawn by the self-balancing vehicle of claim 1, wherein a single-beam connecting rod corresponding to a single-beam carriage beam and extending forwards above the frame is mounted on the main vertical frame of the pull rod vehicle, the single-beam connecting rod is rigidly connected with the pull rod vehicle, namely the single-beam connecting rod has no moving room relative to the main vertical frame of the vehicle body, and the front end of the single-beam connecting rod is provided with a thread for connecting with a fisheye rod end joint bearing.

7. The combined riding carrying vehicle towed by the self-balancing vehicle of claim 1 or 6, it is characterized in that the balance shaft is provided with screw threads, and is sleeved with an axis sleeve which provides a smooth axis and is shorter than the balance shaft, when the balance shaft is mounted upwards, the shaft center sleeve is sequentially sleeved with a gasket, a support sleeve, a thrust ball bearing and an SI inner tooth fisheye rod end joint bearing screwed at the front end of the pull rod vehicle single-shaft connecting rod from bottom to top, a nut device is arranged on the balance shaft thread exposed above the shaft center sleeve to limit the upward movement of the fisheye rod end joint bearing, when the balance shaft is installed downwards, the shaft center sleeve is sequentially sleeved with an SI inner tooth fisheye rod end joint bearing, a thrust ball bearing, a gasket and an anti-falling nut which are screwed at the front end of the single-shaft connecting rod of the pull rod vehicle from top to bottom.

8. The combination riding carrying vehicle pulled by the self-balancing vehicle of claim 7, wherein the fisheye rod end joint bearing connected to the front end of the single beam connecting rod of the pull rod vehicle can be freely replaced between the SI inner tooth and the SA outer tooth, the SI inner tooth fisheye rod end joint bearing is directly screwed on the thread of the front end of the single beam connecting rod of the pull rod vehicle, and the SA outer tooth fisheye rod end joint bearing is butted with the front end of the single beam connecting rod of the pull rod vehicle through a butt nut.

9. The combination riding carrying cart pulled by the self-balancing cart of claim 1, wherein some self-balancing carts naturally have a vertical shaft assembly capable of being used as a balancing shaft, the vertical shaft assembly is directly used for connecting and installing the pull rod cart, a fisheye rod end joint bearing or a diamond seat spherical outside bearing connected to the front end of a single beam connecting rod of the pull rod cart is sleeved on the vertical shaft assembly used as the balancing shaft, an SA external tooth fisheye rod end joint bearing capable of rotating in a hole is inserted and fixed in a circular hole at one end of the diamond seat spherical outside bearing, a bolt with a cap is inserted into a shaft hole of the fisheye rod end joint bearing, and the bolt passing through the shaft hole is butted with the single beam connecting rod of the pull rod cart by a butting nut.

10. The combined riding and carrying vehicle towed by the self-balancing vehicle of claim 9, wherein the fisheye rod end knuckle bearings connecting the pull rod vehicle and the double-wheel self-balancing vehicle can be replaced by diamond-seat spherical outside bearings.

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