Tilting three-wheel vehicle

Abstract

The invention relates to a three-wheeled vehicle (1) equipped with two front steering wheels and two footboards (41.1, 41.2) on which a driver stands to steer the vehicle. The footboards are supported by an inclined four-bar linkage with a front cross member (27) and a rear cross member (33) between which extend two rocker arms (31.1, 31.2). The front steering wheels are supported by the rocker arms and rotate about steering axes (S.1, S.2).

Description

[Technical field]

[0001] The present invention relates to motor vehicles, particularly vehicles useful for urban transportation. In particular, the embodiments disclosed herein relate to an electric scooter having two front steering wheels. [Background technology]

[0002] The growing need for practical, lightweight means of transportation, especially for use in urban areas, has led to the development of various types of vehicles that are lightweight and easy to handle. In recent years, electric scooters, particularly two- or three-wheeled scooters equipped with electric motors, have been developed. Three-wheeled scooters are particularly easy to handle. In addition, the use of electric motors makes them advantageous vehicles in terms of environmental impact.

[0003] WO 2018 / 216727 discloses a three-wheeled electric scooter with a rear drive wheel and two front steering wheels. To increase driving comfort, the scooter disclosed in WO 2018 / 216727 is configured as a tilting vehicle, i.e. configured to be tilted to the right and to the left with respect to the vertical center plane of the vehicle, for example in curves. For this purpose, the two front steering wheels are connected to the frame of the vehicle by a four-bar linkage. The four-bar linkage comprises a first front cross member and a second front cross member hinged at the center to the frame of the vehicle, more precisely to its front part. The two cross members form the connecting rod of the four-bar linkage. The two cross members are arranged one above the other and extend in the right-left direction of the vehicle. The two cross members are connected to each other by two upright members, one on the right and one on the left, respectively. The two upright members form the two rocker arms of the four-bar linkage. The uprights support the two front steering wheels with their steering axes parallel to the uprights. When driving, for example in curves, the vehicle can be tilted. This tilt (roll) movement is obtained by deformation of the four-bar linkage, which allows the vehicle to tilt about a horizontal axis that lies in the vehicle's mid-plane and passes through the contact points between the ground and the rear wheels.

[0004] Two supporting footboards are provided for driving the vehicle and controlling its tilting movement. The driver stands on the two footboards and drives the vehicle by holding the handlebar. The footboards are rigidly connected to the two uprights and therefore maintain a constant angle with respect to the frame of the vehicle during the tilting movement. To support the footboards with respect to the frame of the vehicle, an inclined rear bar is provided which is hinged at its center to the rear part of the frame of the vehicle and has two lateral ends close to the rear driving wheels and to which the footboards are hinged.

[0005] The resulting structure is complex and expensive, which is a drawback for this type of vehicle, where it is preferable to reduce the number of parts, weight and cost in order to make it easier to handle. Furthermore, the three-wheeled tilt scooters of the prior art have a series of structural limitations, which for example require the use of small diameter wheels, which do not promote comfortable driving and stability of the vehicle.

[0006] British Patent GB1561253 shows an electric three-wheeled vehicle. The vehicle comprises a frame, a rear drive wheel and two steered front drive wheels. The front drive wheels are supported by an inclined four-bar linkage having a first front cross member and a second front cross member disposed below the first front cross member. The first front cross member and the second front cross member are hinged at their centers to the frame and connected to each other by a left rocker arm and a right rocker arm. The two rocker arms are respectively constrained by two end hinges to the corresponding two ends of the first front cross member and the second front cross member. Furthermore, two footboards are rigidly connected to the second front cross member located below the first front cross member, and these footboards are in turn hinged at their rear sides to a rear cross member whose center is hinged to the frame near the rear drive wheel.

[0007] Chinese utility model CN205769836U discloses an electric three-wheeled vehicle with a frame, a rear drive wheel, and two front steered drive wheels. The front steered drive wheels are supported by a tilting four-bar linkage, which includes a first front cross member, a second front cross member, and two rocker arms connecting the first front cross member and the second front cross member. The first front cross member is located above the second front cross member. The two front steered drive wheels are supported by the two rocker arms of the tilting four-bar linkage. The second front cross member disposed below forms a rectangular frame together with two longitudinal beams extending in the front-rear direction. Each beam has its front end rigidly connected to the second front cross member, and its rear end rigidly connected to the rear cross beam. The rear cross beam is hinged at its center to the vehicle frame near the rear drive wheels. The rear cross beam, the longitudinal beams and the second front cross member form a substantially rigid rectangular frame, and a footboard for supporting the feet is rigidly connected to the longitudinal beams.

[0008] The prior art vehicles discussed above are of complex construction, requiring a large number of parts and, as a result, are cumbersome, heavy and expensive.

[0009] There is therefore a need for an improved three wheel tilting vehicle, in particular a scooter type, i.e. a three wheel tilting vehicle designed to be operated standing up, to overcome, either fully or partially, one or more of the shortcomings of the prior art vehicles. Summary of the Invention

[0010] Disclosed herein is a tilting three-wheel vehicle, particularly of the scooter type, adapted to be driven while standing on a particular footboard, the structure of which is simpler and less costly than that of the prior art vehicles mentioned above. The vehicle comprises a frame, on which one rear driving wheel and two front steering wheels are supported. Furthermore, two footboards are restrained to the frame, allowing the driver to drive the vehicle while standing. The vehicle comprises a tilting four-bar linkage. The tilting four-bar linkage comprises a left rocker arm, a right rocker arm, a single front cross member extending in the left-right direction of the vehicle and hinged at its center to the frame, the left end of which is hinged to the left rocker arm and the right end of which is hinged to the right rocker arm, and a rear cross member hinged at its center to the frame.

[0011] More specifically, the left end of the front cross member is hinged directly to the left rocker arm and specifically includes a first left hinge connecting the left end of the front cross member to the left rocker arm, and the right end of the front cross member is hinged directly to the right rocker arm and specifically includes a first right hinge connecting the right end of the front cross member to the right rocker arm.

[0012] The rocker arms are connected directly to the rear cross member, for example, by second left and right hinges that are directly connected to each other and that connect the left rocker arm directly to the left end of the rear cross member and the right rocker arm directly to the right end of the rear cross member.

[0013] Advantageously, the hinges connecting the components of the tilting four bar linkage (i.e. the left rocker arm, the right rocker arm, the front cross member and the rear cross member) have hinge axes which are substantially parallel to each other.

[0014] The left and right front steering wheels are supported by left and right rocker arms, respectively, that form a tilted four-bar linkage and are adapted to rotate about respective steering axes. The vehicle further includes a left footboard supported by the rear cross member and the left rocker arm, and a right footboard supported by the rear cross member and the right rocker arm. The two footboards form a support member that allows the driver to drive while standing on the footboards.

[0015] Contrary to prior art vehicles, the tilting four-bar linkage has a single front cross member which forms the first connecting rod of the four-bar linkage, the second connecting rod of the four-bar linkage is formed by the rear cross member which supports the two footboards which together with the rocker arms support the legs of the driver.

[0016] Therefore, the tilting four-bar link is disposed under the vehicle.

[0017] The tilting four-bar linkage runs longitudinally, rather than vertically as in prior art vehicles, and uses cross members as connecting rods (in addition to a front cross member hinged to the front portion of the vehicle frame) which form the tilting rear support members for the footboard and are hinged to the frame in the lower region of the vehicle, rearward of the handlebars and steering column and adjacent to the rear drive wheels.

[0018] As a result, the structure is significantly simpler than that of conventional vehicles, making them lighter, easier to handle, and less expensive.

[0019] In this specification and the appended claims, "right" and "left" mean the right and left sides of the vehicle relative to an operator in a driving position on the vehicle.

[0020] In a possible embodiment, the left and right footboards are located at intermediate positions between the front and rear cross members, for example, the left footboard may be rigidly secured to the left rocker arm and the right footboard may be rigidly secured to the right rocker arm.

[0021] In another embodiment, the left and right footboards may be rigidly connected to the rear cross member, for example, the left and right footboards may be located rearward of the rear cross member relative to the front-to-rear direction of the vehicle.

[0022] In a possible advantageous embodiment, a left rod-like support member for supporting the driver's left leg is rigidly connected to the left footboard, and a right rod-like support member for supporting the driver's right leg is rigidly connected to the right footboard. The rod-like support members can be sized to provide support for the driver's calf area. For example, the left rod-like support member and the right rod-like support member can be positioned higher than the respective left and right footboards, and closer to the center plane of the vehicle than the respective footboards, i.e., closer to a symmetrical vertical plane extending in the front-rear direction of the vehicle.

[0023] In practice, the two cross members of the four-bar link, i.e. the components forming the connecting rods of the four-bar link, are arranged in the lower area of ​​the vehicle. In a possible embodiment, the front cross member can be arranged in a mid-position between the two front steering wheels, at a distance from the support surface of the vehicle smaller than the diameter of the front steering wheels. In effect, the front cross member of the tilting four-bar link can be arranged inside the delimited volume between the two front steering wheels, rather than at a level higher than the front steering wheels, as occurs in the above-mentioned prior art vehicles. The front cross member can thus be hinged to the frame of the vehicle around an axis arranged at a height smaller than the diameter of the left front steering wheel and the diameter of the right front steering wheel.

[0024] The four-bar link has only one front cross member, which allows the use of wheels with larger diameters than those currently used on known vehicles of this type, thereby improving driving stability, vehicle safety and comfort.

[0025] A second cross member forming a second connecting rod of the four-bar linkage may be located rearward and below the front cross member, and its pivot axis relative to the vehicle frame may be located at the lowest region of the frame.

[0026] The link connecting the steering post to the front steered wheels may comprise a steering rod-like member located rearward of the axis of rotation of the steering post, relative to the forward direction of travel of the vehicle.

[0027] Further advantageous features of the vehicle according to the invention are described below and defined in the accompanying claims. The invention will be better understood by following the description and the accompanying drawings which show non-limiting exemplary embodiments of the invention. [Brief description of the drawings]

[0028] [Figure 1] 1 is a schematic side view of a vehicle according to a first embodiment. [Diagram 2] FIG. 2 is a plan view taken along line II-II in FIG. [Diagram 3] FIG. 2 is a front view taken along line III-III in FIG. [Figure 4] FIG. 4 is a perspective view of the vehicle of FIGS. 1 to 3. [Diagram 5] 4. FIG. 5 is a perspective view of the vehicle of FIGS. 1 to 3, as viewed from an angle different from that of FIG. [Figure 6] FIG. 6 is a perspective view of the vehicle of FIGS. 1 to 5 with the left wheel removed. [Figure 7] FIG. 7 is a perspective view of the vehicle of FIGS. 1 to 5 with the left wheel removed, seen from an angle different from that of FIG. 6. [Figure 8] FIG. 11 is a schematic side view of a vehicle according to a second embodiment. [Figure 9] FIG. 9 is a plan view taken along line IX-IX in FIG. 8. [Figure 10] FIG. 9 is a front view taken along line XX in FIG. 8. [Figure 11] FIG. 11 is a perspective view of the vehicle of FIGS. 8 to 10. [Figure 12]11. FIG. 12 is a perspective view of the vehicle of FIGS. 8 to 10, as viewed from an angle different from that of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] A first embodiment of a tilting three-wheel vehicle in the form of a scooter is shown in Figs. 1 to 7.

[0030] In Figures 1, 2 and 3, the arrow FB indicates the front-to-rear direction of the vehicle, the arrow F indicates the normal forward direction of the vehicle, the arrow LR indicates the left-to-right direction of the vehicle relative to the median plane MM, and the arrow UD indicates the up-down direction of the vehicle relative to the normal position of the vehicle.

[0031] The vehicle is generally designated 1 and comprises a frame 3 having a front part (front end) 3A and a rear part (rear end) 3B. Rear drive wheels 5 are supported in the rear area of ​​the frame 3 and the front end 3A is provided with two front steering wheels, more precisely a left front steering wheel 7.1 and a right front steering wheel 7.2. In this specification, components which are symmetrically present on the left and right sides of the vehicle 1 are designated with the same reference number followed by ".1" for components to the left of the median plane MM and ".2" for components to the right of the median plane.

[0032] The vehicle 1 may be electric. Although the use of an internal combustion engine is not excluded, in an advantageous embodiment the vehicle 1 has an electric motor, as shown diagrammatically in the drawings. Reference numeral 9 denotes the electric motor and reference numeral 11 denotes a battery pack. The electric motor 9 may be arranged coaxially with the rear drive wheel 5, as shown in the drawings, although other configurations with transmission from the electric motor to the axle of the rear drive wheel are possible. In a further variant, the vehicle 1 may not have a motor and may be used, for example, as a kick scooter, pushed by a driver.

[0033] A steering tube 13, into which a steering post 15 integral with a handlebar 17 is rotatably inserted, is fixed to the front part of the frame 3. The reference SS indicates the axis of rotation of the steering post 15. The driver controls the steering movement of the front steering wheels 7.1 and 7.2 by means of the handlebar 17, which also forms an element for supporting the driver when standing on the vehicle, as will become clear below.

[0034] The front steering wheels 7.1 and 7.2 are connected to the steering column 15 via a steering rod-like member 21. The opposite left and right ends of the steering rod-like member 21 are hinged to supports 23.1, 23.2 which are rotatable about the steering axis S.1 of the left front steering wheel 7.1 and the steering axis S.2 of the right front steering wheel 7.2, respectively. Reference BB denotes the rotation axis of the front steering wheels 7.1 and 7.2. These axes coincide with each other when the vehicle 1 is in a vertical position, the roll angle is zero (the vehicle is at 90° with respect to the ground) and the steering angle is zero, as shown in Figures 1, 2 and 3.

[0035] In the illustrated embodiment, the support members 23.1 and 23.2 of the front steering wheels 7.1 and 7.2 are rotatably housed in tubular elements 25.1 and 25.2, whose axes coincide with the steering axes S.1 and S.2, respectively. The tubular elements 25.1 and 25.2 are hinged to a front cross member 27, which is hinged to the frame 3 by a hinge 27A, so as to be rotatable about an axis CC that is substantially horizontal and lies in the central plane MM. The references 28.1 and 28.2 indicate hinges for connecting the two ends of the front cross member 27 to the tubular elements 25.1 and 25.2, respectively. The axis of the hinges 28.1 and 28.2 is substantially parallel to the axis of the hinge 27A, which rotatably connects the front cross member 27 to the frame 3. In a neutral position of the vehicle, i.e. in a vertical position (zero roll angle) and with the wheels not steered, the axes of hinges 28.1 and 28.2 as well as hinge 27A are parallel to the median plane MM of the vehicle. The axis of hinge 27A lies on said median plane.

[0036] The cross member 27 is arranged at a height such that it is located between the two front steering wheels 7.1 and 7.2. In other words, the diameter of the front steering wheels 7.1 and 7.2 can be made larger than the distance of the cross member 27 from the ground on which the vehicle 1 rests. This allows the use of larger sized wheels than those used in prior art vehicles, making the vehicle 1 easier to handle and more stable.

[0037] The tubular elements 25.1 and 25.2 are part of two rocker arms, namely a left rocker arm 31.1 and a right rocker arm 31.2, of a four-bar linkage of which the front cross member 27 forms one of the connecting rods. Each rocker arm 31.1 and 31.2 is hinged directly to the single front cross member 27 by means of said hinges 28.1 and 28.2. In addition, each rocker arm 31.1 and 31.2 is hinged to the rear cross member 33 which forms the second connecting rod of the four-bar linkage. The rocker arms 31.1 and 31.2 therefore represent the upright members of the four-bar linkage. The four-bar linkage is consequently formed by the single front cross member 27, the rear cross member 33 and the rocker arms. 31.1 and 31.2 3A. More specifically, left rocker arm 31.1 is hinged to the left end of rear cross member 33 via hinge 35.1 and right rocker arm 31.2 is hinged to the right end of rear cross member 33 via hinge 35.2. Rear cross member 33 is hinged at its center to frame 3 via hinge 33A (as shown in particular in Figures 4 and 6). Hinges 35.1, 35.2 and 33A have axes that are parallel to one another and which are also parallel to the axes of hinges 28.1, 28.2 and 27A.

[0038] The four-bar link is formed by the connecting rods, i.e. cross members 27 and 33, and the rocker arms 31.1 and 31.2, forming the tilting four-bar link of the vehicle 1. As can be seen from the drawings, the hinges 28.1, 28.2, 35.1 and 35.2 of the four-bar link are not coplanar, but lie in two spaced apart planes in the longitudinal direction FB of the vehicle. Furthermore, the hinges 28.1 and 28.2 are located forward and higher than the hinges 35.1 and 35.2.

[0039] In terms of detailed construction, all four-bar hinges 28.1, 28.2, 35.1 and 35.2 are inclined at a predefined angle, measured between the axes S1 and S2 and the respective hinge axes 28.1 and 28.2, which angle is the same for all inclined hinges of the four-bar. Thus, all four-bar hinges 28.1, 28.2, 35.1 and 35.2 are parallel to each other. This arrangement maintains the functionality of the four-bar and also limits the overall dimension of the height of the four-bar, measured as the difference in level or height between the front cross member (in a higher position) and the rear cross member (in a lower position). In this way, the four-bar has a reduced height, i.e. a substantially flush height.

[0040] In the embodiment shown in Figures 1 to 7, two footboards 41.1 and 41.2 are rigidly connected to the two rocker arms 31.1 and 31.2. Said footboards are arranged to support the left and right feet, respectively, of a driver who drives the vehicle 1 while standing on the handlebars 17. Thus, in the present invention, the footboards 41.1 and 41.2 are associated with the upright members of the four-bar linkage, i.e. with the rocker arms 31.1 and 31.2. In contrast, in the prior art solutions, the footboards are associated with one of the cross members, in particular with the lower cross member. In this case, when the vehicle tilts, the footboards remain parallel to the ground, i.e. do not follow the tilting movement. Differently, in the present invention, the footboards are integral with the respective rocker arms, i.e. fixed to the respective rocker arms, so that when the vehicle tilts, the footboards tilt according to an angle corresponding to the roll angle, as will be explained later.

[0041] Advantageously, as shown in the embodiment of Figures 1 to 7, the rocker arms 31.1 and 31.2 have bar-shaped members with the shapes indicated by the references 32.1 and 32.2, respectively. In plan view, the two shaped bar-shaped members 32.1 and 32.2 are closer to the vehicle's mid-plane MM than the footboards 41.1 and 41.2 (see Figure 2). In side view (Figure 1), the two shaped bar-shaped members 32.1 and 32.2 are higher than the footboards 41.1 and 41.2. The shaped bar-shaped members 32.1 and 32.2 form bar-shaped members for supporting the legs of the driver. More specifically, the driver standing on the footboards 41.1 and 41.2 can rest his left and right calves on the shaped bar-shaped members 32.1 and 32.2.

[0042] In a practical embodiment, each shaped bar 32.1 and 32.2 is in the shape of an inverted U and is rigidly connected to each tubular element 25.1 and 25.2 and to the rear cross member 33 by a respective rear hinge 35.1 and 35.2. Further shaped bar members 34.1 and 34.2 rigidly connected to each shaped bar 32.1 and 32.2 form the fixing elements of each platform 41.1 and 41.2.

[0043] The vehicle described above allows a tilting movement to the left and right about an axis contained in the median plane MM and located at the level of the ground on which the vehicle 1 rests via the wheels 5, 7.1 and 7.2. In figure 3 the tilting movement is indicated by the double arrow R, with AR indicating the roll axis perpendicular to the plane of figure 3. In use, the vehicle can be tilted while driving by the driver shifting his weight on the footboards 41.1 and 41.2 and, at least partly, on the rods 32.1 and 32.2.

[0044] For example, when traveling around a curve to the left, the driver shifts his / her weight to the inside of the curve, i.e., puts more weight on the left footboard 41.1 and puts part of his / her weight on the right rod-shaped member 32.2 via his / her right calf. This causes the vehicle to tilt towards the inside of the curve, i.e., in this case, to the left around the roll axis AR. Conversely, when traveling around a curve clockwise, the driver puts more weight on the right footboard 41.2 and puts part of his / her weight on the left rod-shaped member 32.1 via his / her left calf. This causes the vehicle to tilt to the right around the roll axis AR.

[0045] Said tilting movement is made possible by deformation of the four-bar link formed by the front cross member 27 and the rear cross member 33, i.e. the connecting rods and the rocker arms 31.1 and 31.2, without the need for a front four-bar link with two cross members hinged at their front ends, as is the case in prior art vehicles.

[0046] In the above embodiment shown in figures 1 to 7, the footboards 41.1 and 41.2 supporting the feet of the driver are rigidly connected to the rocker arms 31.1 and 31.2, respectively, and therefore follow their movements. Nevertheless, this is not necessary. Figures 8 to 12 show an embodiment in which the footboards supporting the feet of the driver are mounted in a different way.

[0047] In figures 8 to 12, the same reference numerals denote elements already described with reference to figures 1 to 7 or equivalent elements. These elements will not be described again. The main difference between the embodiment of figures 1 to 7 and that of figures 8 to 12 is that in the latter embodiment, the footboards, designated 41.1 and 41.2, are rigidly fixed to the rear cross member 33. To allow a correct positioning of the footboards 41.1 and 41.2 with respect to the handlebars 17, the rocker arms 31.1 and 31.2 are shortened in the fore-aft direction (FB). In this case, no rod-like members are provided to support the legs of the rider, since the legs are located behind the rocker arms 31.1 and 31.2.

[0048] As a result, when the vehicle 1 tilts around the roll axis AR, the footboards 41.1 and 41.2 maintain an approximately horizontal posture, whereas in the embodiment of Figures 1 to 7, the inclination of the footboards 41.1 and 41.2 follows the movement of the vehicle 1, so that they tilt at an angle equal to the roll angle relative to the horizontal.

Claims

1. Frame (3), and at least one rear drive wheel (5) supported by said frame (3); A tilting four-bar link, left rocker arm (31.1); Right rocker arm (31.2); a single front cross member (27) extending in the left-right direction (L-R) of the vehicle (1), centrally hinged to the frame (3), and having a left end directly hinged to the left rocker arm (31.1) via a left hinge (28.1) and a right end directly hinged to the right rocker arm (31.2) via a right hinge (28.2); and a rear cross member (33) hinged at its center to the frame (3), the left rocker arm (31.1) being hinged to the left end of the rear cross member (33) via a left hinge (35.1) and the right rocker arm (31.2) being hinged to the right end of the rear cross member (33) via a right hinge (35.2); a left front steering wheel (7.1) supported by a left rocker arm (31.1) for rotation about a left steering axis (S.1); a right front steering wheel (7.2) supported by a right rocker arm (31.2) for rotation about a right steering axis (S.2); a steering column (15) rotatably housed in a steering tube (13) rigidly connected to the frame (3), connected to the handlebars (17) and connected via a steering link (21) to the left front steering wheel (7.1) and the right front steering wheel (7.2); a left footboard (41.1) supported by the rear cross member (33) and the left rocker arm (31.1); a right footboard (41.2) supported by the rear cross member (33) and the right rocker arm (31.2); a left footboard (41.1) disposed at an intermediate position between the front cross member (27) and the rear cross member (33); A right footboard (41.2) is disposed at an intermediate position between the front cross member (27) and the rear cross member (33). A vehicle characterized in that

2. A left footboard (41.1) is rigidly connected to a left rocker arm (31.1), The right footboard (41.2) is rigidly connected to the right rocker arm (31.2).

2. The vehicle according to claim 1 .

3. The left footboard (41.1) and the right footboard (41.2) are rigidly connected to the rear cross member (33).

2. The vehicle according to claim 1 .

4. The left rocker arm (31.1) is provided with a left rod-shaped support member (32.1) for supporting the left leg of the driver, The right rocker arm (31.2) includes a right rod-shaped support member (32.2) for supporting the right leg of the driver, the left rod-like support member and the right rod-like support member are disposed at a height higher than the left footboard and the right footboard, respectively; the left rod-like support member (32.1) is disposed closer to the center plane (M-M) of the vehicle (1) than the left footboard (41.1); The right rod-like support member (32.2) is disposed closer to the center plane (M-M) of the vehicle (1) than the right footboard (41.2). A vehicle according to any one of claims 1 to 3.

5. A front cross member (27) is positioned at a midpoint between the left front steering wheel (7.1) and the right front steering wheel (7.2) and is hinged to the frame (3) about an axis located at a height smaller than the diameters of the left front steering wheel (7.1) and the right front steering wheel (7.2). A vehicle according to any one of claims 1 to 4.

6. A link connecting the steering post (15) to the left front steering wheel (7.1) and the right front steering wheel (7.2) has a steering rod-like member (21) arranged rearward of the rotation axis (S) of the steering post (15) with respect to the forward direction of travel of the vehicle. A vehicle according to any one of claims 1 to 5.

7. Equipped with an electric motor (9). A vehicle according to any one of claims 1 to 6.

8. The electric motor (9) is coaxial with the rear drive wheel (5).

8. The vehicle according to claim 7.

9. A left front steering wheel (7.1) is rotatably supported about a left steering axis (S.1) by a left support member (23.1) rotatably housed in a left tubular element (25.1) rigidly connected to a left rocker arm (31.1); The right front steering wheel (7.2) is rotatably supported about a right steering axis (S.2) by a right support member (23.2) rotatably housed in a right tubular element (25.2) rigidly connected to a right rocker arm (31.2). A vehicle according to any one of claims 1 to 8.

10. A left footboard (41.1) and a right footboard (41.2) are disposed behind a rear cross member (33) in the fore-and-aft direction (F-B) of the vehicle (1).

4. The vehicle according to claim 3.

Images