CN219821558U - Rear-drive vehicle - Google Patents

Abstract

The utility model relates to a rear-drive vehicle, which comprises a vehicle body component, a front wheel component, a rear wheel component, an auxiliary steering device and auxiliary wheels. The front wheel assembly and the rear wheel assembly are arranged on the vehicle body assembly along the length direction of the rear-drive vehicle, and the auxiliary steering device is arranged between the front wheel assembly and the rear wheel assembly and is arranged in the middle of the vehicle body assembly along the width direction of the rear-drive vehicle. The auxiliary wheel is rotatably mounted to the bottom of the body assembly by an auxiliary steering device that is capable of collapsing or expanding. When the auxiliary steering device is contracted, the auxiliary wheels are suspended, and the front wheel assembly and the rear wheel assembly jointly support the vehicle body assembly and drive the rear-drive vehicle to run. When the auxiliary steering device stretches, the auxiliary wheels are matched with the rear wheel assembly to jointly support the vehicle body assembly, the front wheel assembly is suspended, and the auxiliary wheels and the rear wheel assembly drive the rear-drive vehicle to steer. The rear-drive vehicle solves the problem that the steering of the automobile is difficult in a narrow space due to the fact that the turning radius of the automobile is large.

Description

Rear-drive vehicle

Technical Field

The utility model relates to the technical field of automobiles, in particular to a rear-drive vehicle.

Background

The automobile transmits the power of the power system to wheels through a transmission system, and the wheels drive the automobile to run. When steering is needed, the direction of the front wheels is changed through the steering system, so that the running direction of the automobile is changed. When the automobile turns, the distance from the steering center to the front wheel at the outer side of the automobile is the turning radius. While the turning radius of the car can reflect the car's ability to pass through narrow curved zones or bypass obstacles. The magnitude of the turning radius of the automobile is determined by the wheelbase of the automobile. In order to improve the smoothness of automobile driving, the wheelbase is usually made longer, so that the turning radius of the automobile is larger, and the automobile is difficult to turn in a narrow space.

Disclosure of Invention

Based on this, it is necessary to provide a rear-drive vehicle to solve the problem that the turning radius of the vehicle is large, which results in difficulty in steering the vehicle in a narrow space.

A rear-drive vehicle includes a body assembly, a front wheel assembly, a rear wheel assembly, an auxiliary steering device, and auxiliary wheels. The front wheel assembly and the rear wheel assembly are arranged on the vehicle body assembly along the length direction of the rear-drive vehicle, and the auxiliary steering device is arranged between the front wheel assembly and the rear wheel assembly and is arranged in the middle of the vehicle body assembly along the width direction of the rear-drive vehicle. And the auxiliary wheel is rotatably mounted at the bottom of the vehicle body assembly through an auxiliary steering device, and the auxiliary steering device can retract or extend along the axial direction of the auxiliary steering device. When the auxiliary steering device is in a contracted state, the auxiliary wheels are suspended, and the front wheel assembly and the rear wheel assembly jointly support the vehicle body assembly and drive the rear-drive vehicle to run. When the auxiliary steering device is in an extended state, the auxiliary wheels are matched with the rear wheel assembly to jointly support the vehicle body assembly, so that the front wheel assembly is suspended, and the auxiliary wheels and the rear wheel assembly drive the rear-drive vehicle to steer.

In one embodiment, the auxiliary steering device includes a mount and a telescopic shaft. The mount pad fixed connection is in automobile body subassembly, and telescopic shaft one end stretches into the mount pad, and the other end is used for installing auxiliary wheel. The telescopic shaft can rotate relative to the mounting seat along the axial direction of the telescopic shaft so as to drive the auxiliary wheels to steer. The telescopic shaft can extend relative to the mounting seat along the axial direction of the telescopic shaft so as to push the auxiliary wheel to move towards the bottom far away from the vehicle body assembly; alternatively, the telescoping shaft can be shortened relative to the mounting base along its own axis to drive the auxiliary wheel toward the bottom proximate the body assembly. It will be appreciated that so configured, the mounting seat is fixed as a fixed end relative to the body assembly, and the telescopic shaft is movable as a movable end to effect two degrees of freedom movement of the auxiliary wheel relative to the body assembly.

In one embodiment, an auxiliary wheel includes a wheel body and a mounting axle. The installation axle is installed in the telescopic shaft one end that keeps away from the mount pad. The wheel body is rotatably connected to the mounting axle. It will be appreciated that the arrangement is such that the wheel body is able to cooperate with the rear wheel assembly to move the rear drive vehicle when the auxiliary steering device is in the extended condition.

In one embodiment, the rear wheel assembly includes a first rear wheel, a second rear wheel, a first motor, and a second motor. The first rear wheel and the second rear wheel are disposed at intervals along the width direction of the rear-drive vehicle. The first motor is connected with the first rear wheel to drive the first rear wheel to move. The second motor is connected with the second rear wheel to drive the second rear wheel to move. It will be appreciated that the arrangement is such that the first motor and the second motor form two mutually independent drive systems, thereby facilitating the lifting of the smoothness of steering of the rear-drive vehicle.

In one embodiment, a vehicle body assembly defines a first mounting slot and a second mounting slot, a first motor is fixedly mounted within the first mounting slot, and a second motor is fixedly mounted within the second mounting slot. It will be appreciated that this arrangement facilitates the mounting and fixing of the first motor and the second motor.

In one of the embodiments, when the auxiliary steering device is in the contracted state, the axis of the wheel body is disposed parallel to the axis of the first rear wheel, and both are parallel to the width direction of the rear-drive vehicle. It will be appreciated that this arrangement facilitates rapid adjustment of the auxiliary wheel to a predetermined yaw angle.

In one embodiment, the body assembly further defines a third mounting slot, the mount is fixedly mounted within the third mounting slot, and at least a portion of the telescoping shaft is retracted within the third mounting slot when the auxiliary steering device is in the retracted condition. When the auxiliary steering device is in an extended state, the telescopic shaft and the auxiliary wheels extend out of the third mounting groove. It will be appreciated that this arrangement is advantageous in saving the under space of the body assembly and can avoid the auxiliary wheels coming into contact with the ground when the auxiliary steering device is in the contracted state.

In one embodiment, the front wheel assembly includes a first front wheel and a second front wheel, the first front wheel being located opposite to the left side of the second front wheel in the width direction of the rear-drive vehicle, and the third mounting groove being provided between the first front wheel and the second front wheel. It will be appreciated that such an arrangement allows the body assembly to be more evenly stressed, thereby avoiding rollover of the rear-drive vehicle while steering.

In one embodiment, the auxiliary steering device further comprises a driving member, the driving member is arranged in the mounting seat, the telescopic shaft is connected to the driving member, the driving member can drive the telescopic shaft to extend or shorten relative to the mounting seat, and the driving member can drive the telescopic shaft to rotate relative to the mounting seat. It will be appreciated that such an arrangement is advantageous for improving the drive efficiency of the auxiliary wheel.

In one embodiment, the driving member is a hydraulic driving member or an electromagnetic driving member. It will be appreciated that such an arrangement is advantageous for further improving the drive efficiency of the auxiliary wheel.

Compared with the prior art, when the rear-drive vehicle provided by the utility model needs to turn, the auxiliary wheels can deflect a certain angle along the preset direction, and then the auxiliary turning device axially extends out of the bottom of the vehicle body assembly along the self-axis so as to drive the auxiliary wheels to be grounded and prop up the front wheel assembly, so that the front wheel assembly is suspended from the ground. At this time, the steering center of the rear-drive vehicle is the intersection of the auxiliary wheel axis and the rear wheel assembly axis, and the turning radius of the rear-drive vehicle is equal to the distance from the auxiliary wheel to the steering center. And because the auxiliary wheels are positioned between the front wheel assembly and the rear wheel assembly and are arranged in the middle of the vehicle body assembly along the width direction of the rear-drive vehicle, compared with the arrangement that the turning radius of the traditional rear-drive vehicle is equal to the distance from the front wheel on the outer side to the steering center. The rear-drive vehicle provided by the utility model has the advantages that the turning radius is greatly shortened, so that the rear-drive vehicle can conveniently steer in a narrow space.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present utility model, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following descriptions are only some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is a schematic diagram of a rear-drive vehicle according to an embodiment of the present utility model;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a schematic steering diagram of a rear-drive vehicle according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of an auxiliary steering device according to an embodiment of the present utility model.

Reference numerals: 100. a body component; 110. a first mounting groove; 120. a second mounting groove; 130. a third mounting groove; 200. a front wheel assembly; 210. a first front wheel; 220. a second front wheel; 300. a rear wheel assembly; 310. a first rear wheel; 320. a second rear wheel; 330. a first motor; 340. a second motor; 400. an auxiliary steering device; 410. a mounting base; 420. a telescopic shaft; 421. a first mounting post; 4211. a first mounting hole; 422. a second mounting post; 4221. a second mounting hole; 423. a mounting notch; 500. an auxiliary wheel; 510. a wheel body; 511. a third mounting hole; 520. and (5) mounting a shaft.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and the like are used in the description of the present utility model for the purpose of illustration only and do not represent the only embodiment.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" on a second feature may be that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through intermedial media. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of the present utility model have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in the description of the present utility model includes any and all combinations of one or more of the associated listed items.

The automobile transmits the power of the power system to wheels through a transmission system, and the wheels drive the automobile to run. When steering is needed, the direction of the front wheels is changed through the steering system, so that the running direction of the automobile is changed. When the automobile turns, the distance from the steering center to the front wheel at the outer side of the automobile is the turning radius. While the turning radius of the car can reflect the car's ability to pass through narrow curved zones or bypass obstacles. The magnitude of the turning radius of the automobile is determined by the wheelbase of the automobile. In order to improve the smoothness of automobile driving, the wheelbase is usually made longer, so that the turning radius of the automobile is larger, and the automobile is difficult to turn in a narrow space.

Referring to fig. 1-3, in order to solve the problem that the steering of an automobile is difficult in a narrow space due to a large turning radius of the automobile, the utility model provides a rear-drive vehicle. The rear-drive vehicle includes a body assembly 100, a front wheel assembly 200, a rear wheel assembly 300, an auxiliary steering device 400, and auxiliary wheels 500. The front wheel assembly 200 and the rear wheel assembly 300 are mounted to the vehicle body assembly 100 in the longitudinal direction of the rear drive vehicle. The auxiliary steering device 400 is provided between the front wheel assembly 200 and the rear wheel assembly 300 and in the middle of the body assembly 100 in the width direction of the rear-drive vehicle, and the auxiliary wheel 500 is rotatably mounted to the bottom of the body assembly 100 through the auxiliary steering device 400, and the auxiliary steering device 400 can be contracted or extended in the axial direction of itself. When the auxiliary steering device 400 is in the contracted state, the auxiliary wheels 500 are suspended, and the front wheel assembly 200 and the rear wheel assembly 300 support the vehicle body assembly 100 together and drive the rear-drive vehicle to run. When the auxiliary steering device 400 is in the extended state, the auxiliary wheels 500 cooperate with the rear wheel assembly 300 to jointly support the vehicle body assembly 100 so that the front wheel assembly 200 is suspended, and the auxiliary wheels 500 and the rear wheel assembly 300 drive the rear-drive vehicle to steer.

When the rear-drive vehicle needs to turn, the auxiliary wheel 500 can be deflected by a certain angle along the preset direction, and then the auxiliary steering device 400 axially extends out of the bottom of the vehicle body assembly 100 along the self axis to drive the auxiliary wheel 500 to be grounded and prop up the front wheel assembly 200 so as to suspend the front wheel assembly 200 from the ground. At this time, the steering center O of the rear-drive vehicle is the intersection of the axis of the auxiliary wheel 500 and the axis of the rear wheel assembly 300, and the turning radius R of the rear-drive vehicle is equal to the distance between the auxiliary wheel 500 and the steering center O. Because the auxiliary wheel 500 is located between the front wheel assembly 200 and the rear wheel assembly 300 and is provided in the middle of the body assembly 100 in the width direction of the rear-drive vehicle, the turning radius of the rear-drive vehicle is equal to the distance from the outer front wheel to the steering center, as compared with the conventional arrangement. The rear-drive vehicle provided by the utility model has the advantages that the turning radius is greatly shortened, so that the rear-drive vehicle can conveniently steer in a narrow space.

In addition, the auxiliary steering device 400 is arranged between the front wheel assembly 200 and the rear wheel assembly 300, so that the distance between the auxiliary wheel 500 and the rear wheel assembly 300 along the length direction of the rear-drive vehicle can be increased, and the stress of the vehicle body assembly 100 is more uniform, namely, the auxiliary wheel 500 and the rear wheel assembly 300 form a more stable supporting structure.

Further, in one embodiment, as shown in FIG. 2, the rear wheel assembly 300 includes a first rear wheel 310, a second rear wheel 320, a first motor 330, and a second motor 340. The first rear wheel 310 and the second rear wheel 320 are disposed at intervals along the width direction of the rear-drive vehicle, and the first rear wheel 310 is located opposite to the left side of the second rear wheel 320. The first motor 330 is coupled to the first rear wheel 310 to drive the first rear wheel 310 to move. The second motor 340 is coupled to the second rear wheel 320 to drive the second rear wheel 320. The front wheel assembly 200 includes a first front wheel 210 and a second front wheel 220. The first front wheel 210 is located opposite to the left side of the second front wheel 220 in the width direction of the rear-drive vehicle, and the auxiliary steering device 400 is provided at an intermediate position between the first front wheel 210 and the second front wheel 220.

In this way, when the auxiliary steering device 400 is extended out of the bottom of the vehicle body assembly 100 in the axial direction thereof and the first front wheel 210 and the second front wheel 220 are suspended from the ground, the auxiliary wheels 500 are distributed in an isosceles triangle with the first rear wheel 310 and the second rear wheel 320. So that the body assembly 100 is more evenly stressed and rollover of the rear-drive vehicle during steering can be avoided.

And, the first motor 330 is connected to the first rear wheel 310, and the second motor 340 is connected to the second rear wheel 320, so that the first motor 330 and the second motor 340 form two mutually independent driving systems. When the rear-drive vehicle is traveling straight, the first motor 330 and the second motor 340 are operated simultaneously, thereby improving the driving efficiency of the rear-drive vehicle. And when the rear-drive vehicle turns to the right, the first motor 330 is normally operated, and the second motor 340 is not operated or the rotation speed is reduced, so that the rear-drive vehicle can turn more smoothly. Likewise, when the rear-drive vehicle turns to the left, the second motor 340 is normally operated, and the first motor 330 is not operated or the rotation speed is reduced, so that the rear-drive vehicle can turn more smoothly.

Further, in one embodiment, as shown in fig. 2, the body assembly 100 is provided with a first mounting groove 110 and a second mounting groove 120, a first motor 330 is fixedly mounted in the first mounting groove 110, and a second motor 340 is fixedly mounted in the second mounting groove 120.

In this way, the first motor 330 and the second motor 340 are easily installed and fixed. Specifically, the first and second mounting grooves 110 and 120 are provided at the bottom of the vehicle body assembly 100 and between the first and second rear wheels 310 and 320. The first motor 330 may be fastened and fixed in the first mounting groove 110, or may be screwed to the inner wall of the first mounting groove 110 by a fastening bolt. Similarly, the second motor 340 may be fastened and fixed in the second mounting groove 120, or may be screwed to the inner wall of the second mounting groove 120 by a fastening bolt.

In one embodiment, as shown in fig. 4, the auxiliary steering device 400 includes a mounting seat 410 and a telescopic shaft 420, wherein the mounting seat 410 is fixedly connected to the vehicle body assembly 100, and one end of the telescopic shaft 420 extends into the mounting seat 410, and the other end is used for mounting the auxiliary wheel 500. The telescopic shaft 420 can rotate along its own axis relative to the mounting seat 410, so as to drive the auxiliary wheel 500 to turn. Also, the telescopic shaft 420 can be extended in its own axial direction with respect to the mount 410 to push the auxiliary wheel 500 to move toward the bottom away from the vehicle body assembly 100; alternatively, the telescoping shaft 420 can be shortened relative to the mount 410 along its own axis to move the auxiliary wheel 500 toward the bottom near the body assembly 100.

The mounting block 410 is fixed as a fixed end relative to the body assembly 100, while the telescopic shaft 420 is a movable end to move the auxiliary wheel 500 relative to the body assembly 100 in two degrees of freedom.

Further, in an embodiment, as shown in fig. 2, the vehicle body assembly 100 further includes a third mounting groove 130, the mounting seat 410 is fixedly mounted in the third mounting groove 130, and when the auxiliary steering device 400 is in the contracted state, at least part of the telescopic shaft 420 is contracted into the third mounting groove 130. When the auxiliary steering device 400 is in the extended state, the telescopic shaft 420 and the auxiliary wheel 500 protrude out of the third mounting groove 130.

The third mounting slot 130 provides a mounting site for the mount 410. And, when the auxiliary steering device 400 is in the contracted state, at least part of the telescopic shaft 420 is contracted into the third mounting groove 130, that is, the third mounting groove 130 can provide a containing space for part of the telescopic shaft 420, thereby saving the space at the bottom of the vehicle body assembly 100 and avoiding the problem that the auxiliary wheels 500 contact the ground and scratch the ground when the auxiliary steering device 400 is in the contracted state.

Specifically, the third mounting groove 130 is provided at an intermediate position of the first front wheel 210 and the second front wheel 220. The mounting seat 410 may be fastened and fixed in the third mounting groove 130, or may be screwed to the inner wall of the third mounting groove 130 by a bolt.

Further, in an embodiment, the auxiliary steering device 400 further includes a driving member (not shown) disposed in the mounting seat 410, the telescopic shaft 420 is connected to the driving member, the driving member can drive the telescopic shaft 420 to extend or shorten relative to the mounting seat 410, and the driving member can drive the telescopic shaft 420 to rotate relative to the mounting seat 410.

In particular, the driving member may be a hydraulic driving member or an electromagnetic driving member. The telescopic shaft 420 is connected to the output end of the driving member to improve the driving efficiency of the driving member.

In one embodiment, as shown in fig. 4, the auxiliary wheel 500 includes a wheel body 510 and a mounting shaft 520, and the mounting shaft 520 is mounted at an end of the telescopic shaft 420 remote from the mounting seat 410. The wheel body 510 is rotatably connected to a mounting shaft 520.

In this way, when the auxiliary steering device 400 is in the extended state, the wheel body 510 cooperates with the first rear wheel 310 and the second rear wheel 320 to move the rear-drive vehicle.

Specifically, as shown in fig. 4, the telescopic shaft 420 is provided with a first mounting post 421 and a second mounting post 422, the first mounting post 421 and the second mounting post 422 are arranged at intervals to form a mounting notch 423, the wheel body 510 is mounted at the mounting notch 423, the first mounting post 421 is provided with a first mounting hole 4211, the second mounting post 422 is provided with a second mounting hole 4221, the wheel body 510 is provided with a third mounting hole 511, and the mounting shaft 520 sequentially penetrates through the first mounting hole 4211, the third mounting hole 511 and the second mounting hole 4221, and the wheel body 510 is rotatably connected to the telescopic shaft 420.

In this way, the firmness of the connection between the telescopic shaft 420 and the auxiliary wheel 500 is advantageously improved.

Further, in an embodiment, as shown in fig. 2, when the auxiliary steering device 400 is in the contracted state, the axis of the wheel body 510 is disposed parallel to the axis of the first rear wheel 310, and both are parallel to the width direction of the rear-drive vehicle.

That is, when the wheel body 510 is located at the initial position, the wheel body 510 is disposed in parallel with the first rear wheel 310. In this way, when the rear-drive vehicle is required to steer, it is convenient to quickly adjust the wheel body 510 to a preset yaw angle.

Specifically, as shown in fig. 3, the angle a of the wheel body 510 to the right with respect to the longitudinal direction of the rear-drive vehicle is in the range of (0 °,70 °), for example, 30 °, 40 °, 50 ° or the like is preferable. The angle b of the wheel body 510 to the left with respect to the longitudinal direction of the rear-drive vehicle is also in the range of (0 °,70 °), for example, 30 °, 40 °, 50 °, or the like. Of course, the specific deflection can be adjusted according to the actual requirements.

The specific process of steering the rear-drive vehicle rightwards is as follows:

first, the telescopic shaft 420 rotates clockwise with respect to the mount 410 along the axial direction thereof, and the wheel body 510 is deflected rightward by a certain angle with respect to the longitudinal direction of the rear-drive vehicle.

Then, the telescopic shaft 420 is extended in its own axial direction with respect to the mount 410 to push the wheel body 510 to move toward the bottom away from the vehicle body assembly 100 to the ground of the wheel body 510 and to prop up the first front wheel 210 and the second front wheel 220.

The first motor 330 then drives the first rear wheel 310 to rotate to effect steering of the rear-drive vehicle to the right.

When the rear-drive vehicle is turned, the telescopic shaft 420 shortens in its own axial direction relative to the mount 410 to drive the wheel body 510 toward the bottom near the vehicle body assembly 100 until the wheel body 510 is lifted off the ground.

Finally, the telescopic shaft 420 rotates counterclockwise relative to the mounting seat 410 along the axial direction thereof, so as to drive the wheel body 510 to restore to the initial position.

The specific process of steering the rear-drive vehicle leftwards is as follows:

first, the telescopic shaft 420 rotates counterclockwise relative to the mounting base 410 along its own axis, and causes the wheel body 510 to deflect to the left by a certain angle relative to the longitudinal direction of the rear-drive vehicle.

Then, the telescopic shaft 420 is extended in its own axial direction with respect to the mount 410 to push the wheel body 510 to move toward the bottom away from the vehicle body assembly 100 to the ground of the wheel body 510 and to prop up the first front wheel 210 and the second front wheel 220.

The second motor 340 then drives the second rear wheel 320 to rotate to effect left steering of the rear drive vehicle.

When the rear-drive vehicle is turned, the telescopic shaft 420 shortens in its own axial direction relative to the mount 410 to drive the wheel body 510 toward the bottom near the vehicle body assembly 100 until the wheel body 510 is lifted off the ground.

Finally, the telescopic shaft 420 rotates clockwise relative to the mounting seat 410 along the axial direction thereof to drive the wheel body 510 to return to the initial position.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be determined from the following claims.

Claims (10)

1. The rear-drive vehicle is characterized by comprising a vehicle body assembly (100), a front wheel assembly (200), a rear wheel assembly (300), an auxiliary steering device (400) and auxiliary wheels (500), wherein the front wheel assembly (200) and the rear wheel assembly (300) are arranged on the vehicle body assembly (100) along the length direction of the rear-drive vehicle, the auxiliary steering device (400) is arranged between the front wheel assembly (200) and the rear wheel assembly (300) and is arranged in the middle of the vehicle body assembly (100) along the width direction of the rear-drive vehicle, the auxiliary wheels (500) are rotatably arranged at the bottom of the vehicle body assembly (100) through the auxiliary steering device (400), the auxiliary steering device (400) can shrink or stretch along the axial direction of the auxiliary steering device (400),

when the auxiliary steering device (400) is in a contracted state, the auxiliary wheels (500) are suspended, the front wheel assembly (200) and the rear wheel assembly (300) jointly support the vehicle body assembly (100) and drive the rear-drive vehicle to run;

when the auxiliary steering device (400) is in an extended state, the auxiliary wheels (500) cooperate with the rear wheel assembly (300) to jointly support the vehicle body assembly (100) so as to suspend the front wheel assembly (200) and drive the rear-drive vehicle to steer by the auxiliary wheels (500) and the rear wheel assembly (300).

2. The rear-drive vehicle according to claim 1, wherein the auxiliary steering device (400) comprises a mounting seat (410) and a telescopic shaft (420), the mounting seat (410) is fixedly connected to the vehicle body assembly (100), one end of the telescopic shaft (420) extends into the mounting seat (410), the other end is used for mounting the auxiliary wheel (500),

the telescopic shaft (420) can rotate relative to the mounting seat (410) along the axial direction of the telescopic shaft so as to drive the auxiliary wheel (500) to turn; and, the telescopic shaft (420) is capable of elongating in its own axial direction with respect to the mounting seat (410) to push the auxiliary wheel (500) to move away from the bottom of the vehicle body assembly (100); alternatively, the telescopic shaft (420) can be shortened relative to the mounting base (410) along its own axis to drive the auxiliary wheel (500) to move toward the bottom near the vehicle body assembly (100).

3. The rear drive vehicle according to claim 2, wherein the auxiliary wheel (500) includes a wheel body (510) and a mounting axle (520), the mounting axle (520) being mounted to an end of the telescopic axle (420) remote from the mount (410);

the wheel body (510) is rotatably connected to the mounting axle (520).

4. A rear drive vehicle according to claim 3, wherein the rear wheel assembly (300) comprises a first rear wheel (310), a second rear wheel (320), a first motor (330) and a second motor (340);

the first rear wheels (310) and the second rear wheels (320) are arranged at intervals along the width direction of the rear-drive vehicle, the first motor (330) is connected with the first rear wheels (310) to drive the first rear wheels (310) to move, and the second motor (340) is connected with the second rear wheels (320) to drive the second rear wheels (320) to move.

5. The rear drive vehicle of claim 4, wherein the body assembly (100) is provided with a first mounting slot (110) and a second mounting slot (120), the first motor (330) is fixedly mounted in the first mounting slot (110), and the second motor (340) is fixedly mounted in the second mounting slot (120).

6. The rear drive vehicle according to claim 4, characterized in that the axis of the wheel body (510) is arranged parallel to the axis of the first rear wheel (310) and both are parallel to the width direction of the rear drive vehicle when the auxiliary steering device (400) is in a contracted state.

7. The rear drive vehicle according to claim 2, wherein the vehicle body assembly (100) is further provided with a third mounting groove (130), the mount (410) is fixedly mounted in the third mounting groove (130), and when the auxiliary steering device (400) is in a contracted state, at least part of the telescopic shaft (420) is contracted into the third mounting groove (130); when the auxiliary steering device (400) is in an extended state, the telescopic shaft (420) and the auxiliary wheel (500) extend out of the third mounting groove (130).

8. The rear drive vehicle according to claim 7, wherein the front wheel assembly (200) includes a first front wheel (210) and a second front wheel (220), the first front wheel (210) being located on a left side of the second front wheel (220) with respect to a width direction of the rear drive vehicle, the third mounting groove (130) being provided between the first front wheel (210) and the second front wheel (220).

9. The rear drive vehicle according to claim 2, characterized in that the auxiliary steering device (400) further comprises a driving member provided in the mount (410), the telescopic shaft (420) is connected to the driving member, the driving member is capable of driving the telescopic shaft (420) to extend or shorten with respect to the mount (410), and the driving member is capable of driving the telescopic shaft (420) to rotate with respect to the mount (410).

10. The rear drive vehicle of claim 9, wherein the drive is a hydraulic drive or an electromagnetic drive.