IL285346A - mearoundme - Google Patents

Description

285336/2 - 1 - 0281357564- A WHEEL SUSPENSION SYSTEM AND VEHICLE INCLUDING THE SAME TECHNOLOGICAL FIELD The presently disclosed subject matter relates to the field of automotive applications, particularly, to lightweight tiltable vehicles having independent wheel suspension systems including knuckle assemblies.

BACKGROUND Examples of vehicles of the kind to which the presently disclosed subject matter refers are disclosed in: • US9994277B2, which discloses an inclinable vehicle having a tilting front wheel set, comprising a double deformable parallelogram connecting the two front wheels to the chassis, and two dampers associated with suspension springs, each connecting one of the suspension arms, to a common connection plate, characterized in that said connection plate is guided by an arch secured to the chassis; • US10076939B2, which discloses A laterally tiltable, multitrack vehicle suspension may include first and second steering knuckles. The suspension may also include a first set of control arms connected to the first steering knuckle and a second set of control arms connected to the second steering knuckle. Each of the first and second sets of control arms may include upper and lower control arms. The suspension may further include a spring/damper element acting between the first and second sets of control arms and a balancer system. • US10077090, which discloses an inverted tricycle, which includes: deflecting and steering mechanism, rear frame, driving wheel, two front wheels, said deflecting and steering mechanism configured on the front end of said rear frame, said two front wheels and said deflecting and steering mechanism connected to each other, and symmetrically configured on the left and right sides of the front end of said rear frame, with the rear frame as the axis of symmetry, said driving wheel configured on the rear end of said rear frame; and 285336/2 - 2 - 0281357564- • US20070182120, which discloses a tilting suspension system for a vehicle comprising at least a first and a second wheel (2,3) disposed on a common axle, the module comprising a suspension system adapted to support the at least first and second wheels allowing both tilting and vertical displacement of the at least first and second wheels.

GENERAL DESCRIPTION In accordance with one aspect of the presently disclosed subject matter, there is provided a knuckle assembly for use with a wheel suspension system of a vehicle having a vehicle longitudinal axis, a frame extending therealong, the suspension system comprising upper and lower suspension arms, each having a frame engaging end at which the arm is configured to be pivotally connected to the frame about a proximal suspension axis, and a knuckle engaging end at which the arm is configured to be pivotally connected to the knuckle assembly about a distal suspension axis parallel to the proximal suspension axis, said knuckle assembly comprising: (a) a knuckle configured to enable a wheel to be mounted thereto, the knuckle having a knuckle body extending along a vertical knuckle axis, and comprising upper and lower abutting surfaces, and at least an upper and a lower vertical bore portion extending inwardly from the respective abutting surface along the vertical knuckle axis; (b) an upper steering axle and a lower steering axle, each coaxial with the vertical knuckle axis, and having an inner steering axle portion fixedly received within the respective vertical bore portion and an outer steering axle portion protruding from the upper and lower abutting surfaces, respectively; (c) an upper spacing member and a lower spacing member, each made from a low-friction material, in contact with the respective abutting surface and surrounding the outer portion of the corresponding axle; and (d) an upper joint and a lower joint, each configured for connecting thereto the knuckle engaging end of the corresponding suspension arm so as to allow the arm to pivot about the distal suspension axis; each joint contacting the corresponding spacing member and freely receiving the outer portion of the corresponding steering axle, so as to allow the knuckle, together with the axle, to pivot between the two joints only about the vertical knuckle axis which maintains its position and orientation relative to the joints. 285336/2 - 3 - 0281357564- By virtue of the above structure of the knuckle assembly, in operation thereof, the joints together with the vertical knuckle axis and upper and lower axles are configured to be held in place by the suspension arms whilst allowing the knuckle assembly with the wheel mounted thereto to be tilted and displaced vertically (in the range of about 35-upwards and downwards from the horizontal plane), by corresponding movements of the suspension arms and allowing the knuckle to pivot about the vertical knuckle axis and, thus steer the corresponding wheel, in an extremely wide range of pivoting angles, optionally in the range of 60-100 (30-50 to the right or left), more particularly, in the range of 70-90 (35-45 to the right or left),) and particularly, 80(up to 40 degrees to the right or left). Thus, the knuckle assembly can constitute a part of a leaning suspension system to be associated with one or each of the front or rear pair of wheels of the vehicle, to enable vertical displacement of the wheels of such pair, independently from each other and to enable common steering and tilting of the both wheels. The above knuckle assembly according to the first aspect of the presently disclosed subject matter can further have any one or more of the following features in any combination thereof: - The upper and lower vertical bore portions of the knuckle body can constitute a portion of a single through-bore extending between the upper and lower abutting surfaces thereof. In such case, the upper and lower steering axles can constitute respective upper and lower portions of a common steering axle. - Each spacer of the knuckle assembly can have an in-bore received portion, snuggly fitted within corresponding vertical bore portion and surrounding the inner portion of the corresponding axle. - Each vertical bore portion can comprise a spacer receiving portion in which the in-bore received portion is snuggly fitted, and an axle receiving portion in which the inner portion of the corresponding axle is fixedly received. - Each of the upper and lower steering axles of the knuckle assembly can be configured to freely rotate relative to the corresponding spacer. - The knuckle can comprise a steering extension unitarily formed with the knuckle body and having a remote area spaced from the knuckle body, optionally upwardly and rearwardly, configured to cause the knuckle assembly to be turned and thus steer the associated wheel, upon the application of a steering force to the remote area. 285336/2 - 4 - 0281357564- - The upper and lower joints of the knuckle assembly can have such a configuration that the projection of each of them on the respective upper or lower abutting surface is disposed within the boundaries of this surface. - Each joint of the knuckle assembly can be formed with a joint vertical through-bore coaxial with the vertical knuckle axis, having a proximal potion of a first diameter, a distal portion of a second diameter greater than the first diameter, and a step therebetween; and optionally the outer portion of the associated steering axle received therein can terminate at a head having a diameter greater than the first diameter and smaller than the second diameter, and abutting the step. This enables the steering axle, with its head to be fixedly connected to the knuckle body, to allow free rotation thereof relative to the joint and to secure the assembly of the joint to the knuckle body. - Each joint can further comprise a horizontal bore coaxial with the distal suspension axis and perpendicular to the vertical knuckle axis, the horizontal bore being disposed distally from the head of the outer portion of the corresponding steering axle. The horizontal bore can be configured to receive therein a suspension axle occupying at least a majority of its length, such that when the suspension axle is received within the horizontal bore, the axle can prevent access to the head from the proximal portion of the vertical bore. As such, the suspension axles can be secured within their corresponding joints as long as the associated suspension arms are pivotally attached to the joints by the suspension axle within the horizontal bore. - The low-friction material from which the upper and lower spacing members are made can comprise an acetal resin, e.g. Delrin®. According to this aspect of the presently disclosed subject matter, there is also provided a wheel suspension system comprising the above knuckle assembly and/or a vehicle comprising such wheel suspension system. In accordance with a second aspect of the presently disclosed subject matter, there is provided a leaning wheel suspension system for use with a vehicle having a vehicle longitudinal axis, at least one latitudinal wheel axis intersecting the longitudinal axis and a frame extending along the longitudinal axis, said leaning wheel suspension system comprising: (a) a front steering base having a central steering axis passing through a point of intersection of the vehicle longitudinal axis and the latitudinal wheel axis and defining with the longitudinal axis a plane perpendicular to the latitudinal axis, and right and left 285336/2 - 5 - 0281357564- pairs of upper and lower proximal suspension axes parallel to each other and to said plane; the front steering base comprising a steering bore extending along the central steering axis, and left and right pairs of upper and lower suspension axles extending along the corresponding proximal suspension axes; (b) right and left pairs of upper and lower parallel suspension arms, each having a distal, knuckle engaging end and a proximal, frame engaging end pivotally connected to the corresponding proximal suspension axle so as to pivot about the proximal suspension axis along which the suspension axle extends independently of the corresponding arm of the other pair; (c) right and left knuckle assemblies, each having upper and lower distal suspension axes parallel to the corresponding proximal suspension axes, and comprising a knuckle having a vertical knuckle axis, optionally crossing the distal suspension axes, connected to the knuckle engaging ends of the corresponding suspension arms so as to enable the arms to pivot about the distal suspension axes; and (d) a shock absorbing element interconnecting the lower suspension arms of the right and left pairs of the suspension arms and having a shock absorbing axis parallel to the latitudinal wheel axis, optionally, the shock absorbing axis being spaced from the latitudinal wheel axis in a frontward direction. By virtue of the above structure of the suspension system, each knuckle assembly with the wheel mounted thereto, is configured be vertically displaced therewith independently of the other knuckle assembly, while enabling common leaning of both knuckle assemblies due to the operation of shock absorbing element, which can be configured to transmit a force acting on one of the knuckle assemblies to the other knuckle assembly, while being able to extend or compress when such transmission is impossible/unwanted. The leaning wheel suspension system can constitute a part of a leaning vehicle, to enable movements of the wheels of the vehicle, in accordance with those of the corresponding knuckle assemblies. The wheel suspension system according to the second aspect of the presently disclosed subject matter can further have any one or more of the following features in any combination thereof: - The front and/or the rear steering base, or both, can be formed as a unitary body with the frame or can be integrally assembled with the frame. 285336/2 - 6 - 0281357564- - The central steering axis and the vehicle longitudinal axis can form an angle in the range of 0-25º therebetween. - Each of the right and left knuckle assemblies can comprise upper and lower joints coaxial with the vertical axis and pivotally connected to the knuckle about its vertical axis and can be pivotally connected to the corresponding knuckle engaging ends of the corresponding suspension arms. - The upper suspension arms of the right and left pairs can be configured with a shorter length than the lower suspension arms of the right and left pairs of arms, so as to provide the right and left knuckle assemblies with negative camber angle. In other cases, the lower suspension arms of the right and left sets can be configured with a shorter length than the upper suspension arms of the right and left sets, so as to provide the right and left knuckle assemblies with positive camber angle. - Each suspension arm can comprise a front and a rear beam and a reinforcing diagonal beam extending from the rear beam to a proximal beam intersection portion of the front beam. The shock absorbing element can be connected at right and left ends thereof to the proximal beam intersection portion of each respective lower suspension beam. Further, the shock absorbing axis can be positioned in front of the front steering base. - The frame engaging end of each of the upper and lower suspension arms can comprise horizontal bores receiving therein the respective upper and lower proximal suspension axles via which the arm is pivotally connected to the front steering base. The shock absorbing element can be positioned in front of the steering base, and the suspension arms can be configured with a structure that is configured to focus the forces applied thereon towards a front portion thereof. more specifically, the right and left ends of the shock absorbing element can be connected to the proximal beam intersection portion by right and left extenders, distancing the shock absorbing element from the suspension arms. The distance from the frame facing protrusions of the upper and lower suspension arms of one of the right and left pairs to the frame facing protrusions of the upper and lower suspension arms of the other of the right and left pairs is smaller than the diameter of the steering bore. - The right and left pairs of upper and lower suspension arms are configured to form spaced apart parallel structures with the front steering base and the respective 285336/2 - 7 - 0281357564- knuckle. The distance between each pair of upper and lower proximal suspension axes, i.e. the distance between the parallel structures can be sufficiently small, so as to mitigate the angle differences formed between the left and right parallelogram structures while not being coaxial to each other and while enabling a steering rod threaded in the steering bore to freely rotate therein. According to this aspect of the presently disclosed subject matter, there is also provided a vehicle comprising the above wheel suspension system, and/or each of its right and left knuckle assemblies can be in the form of the knuckle assembly according to the first aspect of the presently disclosed subject matter. In accordance with a third aspect of the presently disclosed subject matter, there is provided a tiltable vehicle having a vehicle longitudinal axis, comprising: (a) a frame extending along the vehicle longitudinal axis; (b) a front steering base assembled with the frame and having a central steering axis intersecting the vehicle longitudinal axis and defining therewith a plane perpendicular to a horizontal reference plane, and comprising a steering bore coaxial with the steering axis; (c) right and left front wheels with a latitudinal wheel axis therebetween perpendicular to said plane, and at least one rear wheel; (d) a front leaning wheel suspension system comprising - right and left parallel structures adapted to support at least indirectly, the respective right and left front wheels and operably connect the corresponding front wheel, separately from the other wheel and in a pivotable manner, to the front steering base, so as to enable common tilting and independent vertical displacement of said right and left front wheels, - a shock absorbing element interconnecting the right and left parallelogram structures and having a shock absorbing axis parallel to the latitudinal wheel axle and being spaced from the latitudinal wheel axis in a frontward direction; and (e) a steering rod rotatably received within said vertical bore of the front steering base, such that tilting of said steering rod results in said suspension system being tilted together with said right and left wheels, respectively, and wherein rotation of the steering rod results in corresponding rotation of the right and left wheels. 285336/2 - 8 - 0281357564- Each of the right and left parallel structures referred to above can comprise: (a) a pair of upper and lower suspension arms, each having a distal, knuckle engaging end and a proximal, frame engaging end pivotally connected to the corresponding proximal suspension axle so as to pivot about the proximal suspension axis along which the suspension axle extends independently of the corresponding arm of the other pair; and (b) a pair of right and left knuckle assemblies, each having upper and lower distal suspension axes parallel to the corresponding proximal suspension axes, and comprising a knuckle having a vertical knuckle axis, connected to the knuckle engaging ends of the corresponding suspension arms so as to enable the arms to pivot about the distal suspension axes. The front steering base can constitute a portion of each of the right and left parallelogram structures. The vehicle according to any of the above aspects can further comprise one or more of the following features in any combination thereof: - A rear steering base can be formed as a unitary body with the frame or can be integrally assembled with the frame and having a rear steering axis extending along the plane and intersecting the vehicle longitudinal axis, and comprising a steering bore extending along the steering axis, wherein the at least one rear wheel is operably mounted thereto. - The at least one rear wheel can be right and left rear wheels. - A rear leaning wheel suspension system comprising right and left parallelogram structures adapted to support right and left rear wheels, respectively, and operably connect each wheel to the rear steering base separately from the other wheel and in a pivotable manner, so as to enable common tilting and independent vertical displacement of said right and left rear wheels, wherein the wheel suspension system having a shock absorbing axis parallel to the rear latitudinal wheel axle and extending to the rear of the rear steering base and interconnecting the right and left parallelogram structures. - The rear steering base can be configured to enable towing of another vehicle, or wheeled luggage thereto via the steering bore of the rear steering base. - The front steering base and the rear steering base can be identical in shape. - The steering axes of the front steering base and the rear steering base can form different angles with the central longitudinal axis. 285336/2 - 9 - 0281357564- - Any features the presently disclosed subject matter described in the Detailed Description.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the subject matter that is disclosed herein and to exemplify how it may be carried out in practice, embodiments will now be described, by way of non-limiting examples only, with reference to the accompanying drawings, in which: Fig.1A illustrates a perspective view of a vehicle according to an example of the presently disclosed subject matter; Fig. 1Billustrates a front view of the vehicle of Fig. 1A, having a front suspension system tilted to the right; Fig. 1Cillustrates the vehicle of Fig. 1B with right and left front wheels rotated to the right; Fig. 1D illustrates a side view of the vehicle of Fig 1A; Fig. 1E illustrates a cross sectional view of the vehicle of Fig 1A along the horizontal plane thereof; Fig. 2A illustrates a perspective view of a front wheel suspension system and a steering system that can be used in a vehicle of the kind shown in Fig. 1A, according to an example of the presently disclosed subject matter; Fig. 2B illustrates a front view of the front wheel suspension system of Fig. 2A; Fig. 2Cillustrates a cross sectional view of the front wheel suspension system of Fig. 2A about the plane of symmetry, with a wheel mounted to the right knuckle assembly Fig. 3A illustrates a perspective view of a front steering base which can be used in a front wheel suspension system of the kind shown in Fig. 2A, according to an example of the presently disclosed subject matter; Fig. 3B illustrates a top view of the front steering base of Fig. 3A, shown with its body being transparent to facilitate the understanding of its internal structure; Fig. 4A illustrates a perspective view of a parallelogram suspension system which can constitute a part of a wheel suspension system of the kind shown in Fig. 2A, according to an example of the presently disclosed subject matter; Fig. 4B illustrates a top view of an upper suspension arm of the wheel suspension system of Fig. 4A; 285336/2 - 10 - 0281357564- Fig. 4C illustrates a top view of a lower suspension arm of the wheel suspension system of Fig.4A; Fig. 5A illustrates a perspective view of a knuckle assembly which can be used in a wheel suspension system of the kind shown in Fig. 2A, according to an example of the presently disclosed subject matter; Fig. 5B is a cross-sectional view of the knuckle assembly shown in Fig. 5A, taken along a plane C-C; Fig. 5C is the knuckle assembly shown in Fig. 5B, with axles positioned therein; Fig. 5Dis the knuckle assembly shown in Fig. 5C, with spacers positioned therein; Fig. 5E is the knuckle assembly shown in Fig. 5D, with axles positioned therein Fig. 6A illustrates a perspective view of a shock absorbing element which can be used in a wheel suspension system of the kind shown in Fig. 2A, according to an example of the presently disclosed subject matter; Fig. 6B illustrates a side view of an extender of the shock absorbing element of Fig. 6A, according to an example of the presently disclosed subject matter; Fig. 6Cillustrates a top view of the extender shown in Fig. 6B ; Figs. 7A to 7F illustrate a front view of a wheel suspension system such as that of Fig. 2A, in different exemplary orientations according to an example of the presently disclosed subject matter.

Claims (23)

285336/3 - 26 - 02813575106- CLAIMS:

1. A leaning wheel suspension system for use with a vehicle having a vehicle longitudinal axis, at least one latitudinal wheel axis intersecting the longitudinal axis and a frame extending along the longitudinal axis, said leaning wheel suspension system comprising: (a) a front steering base having a central steering axis that defining with the longitudinal axis a plane of symmetry perpendicular to the latitudinal axis, and right and left pairs of upper and lower proximal suspension axes being spaced from each other and parallel to each other and to said plane; the front steering base comprising a steering bore extending along the central steering axis and at least partially between said right and left pairs of upper and lower proximal suspension axes, and left and right pairs of upper and lower suspension axles extending along the corresponding proximal suspension axes; (b) right and left pairs of upper and lower parallel suspension arms, each having a distal, knuckle engaging end and a proximal, frame engaging end pivotally connected to the corresponding proximal suspension axle so as to pivot about the proximal suspension axis along which the suspension axle extends independently of the corresponding arm of the other pair; (c) right and left knuckle assemblies, each having upper and lower distal suspension axes parallel to the corresponding proximal suspension axes, and comprising a knuckle having a vertical knuckle axis, connected to the knuckle engaging ends of the corresponding suspension arms so as to enable the arms to pivot about the distal suspension axes; and (d) a shock absorbing element interconnecting the lower suspension arms of the right and left pairs of the suspension arms and having a shock absorbing axis parallel to the latitudinal wheel axis and spaced from the front steering base along the longitudinal axis.

2. The wheel suspension system of Claim 1, wherein each of the vertical knuckle axes cross the corresponding distal suspension axes. 285336/3 - 27 - 02813575106-

3. The wheel suspension system of Claim 1, wherein the shock absorbing axis being spaced from the latitudinal wheel axis in a frontward direction.

4. The wheel suspension system of Claim 1, wherein the front steering base is formed as a unitary body with the frame or integrally assembled with the frame.

5. The wheel suspension system of Claim 1, wherein the steering axis and the vehicle longitudinal axis form an angle in the range of 0-25º therebetween.

6. The wheel suspension system of any one of Claims 1 to 5, wherein each of the right and left knuckle assemblies comprises upper and lower joints coaxial with the vertical axis and pivotally connected to the knuckle about its vertical axis, and being pivotally connected to the corresponding knuckle engaging ends of the corresponding suspension arms.

7. The wheel suspension system of any one of Claims 1 to 6, wherein the upper suspension arms of the right and left pairs are configured with a shorter length than the lower suspension arms of the right and left pairs, so as to provide the right and left knuckle assemblies with negative camber angle.

8. The wheel suspension system of any one of Claims 1 to 6, wherein the upper suspension arms of the right and left pairs are configured with a greater length than the lower suspension arms of the right and left pairs, so as to provide the right and left knuckle assemblies with positive camber angle.

9. The wheel suspension system of any one of Claims 1 to 8, wherein each suspension arm comprises a front beam, a rear beam and a reinforcing diagonal beam extending from the rear beam to a proximal beam intersection portion of the front beam.

10. The wheel suspension system of Claim 1, wherein the frame engaging end of each of the upper and lower suspension arms comprises horizontal bores receiving therein the respective upper and lower proximal suspension axles via which the arm is pivotally connected to the front steering base.

11. The wheel suspension system of Claim 9 wherein the shock absorbing element is connected at right and left ends thereof to the respective proximal beam intersection portion of each respective lower suspension beam.

12. The wheel suspension system of Claim 11, wherein each proximal beam intersection portion comprises an extender, to which right and left ends of the 285336/3 - 28 - 02813575106- shock absorbing element are connected so as to distance the shock absorbing element from the suspension arms.

13. The wheel suspension system of Claim 7, wherein the distance from the frame facing protrusions of the upper and lower suspension arms of one of the right and left pairs to the frame facing protrusions of the upper and lower suspension arms of the other of the right and left pairs is smaller than the diameter of the steering bore.

14. The wheel suspension system of any one of Claims 1 to 13, wherein the right and left pairs of upper and lower suspension arms are configured to form parallel structures with the front steering base and the respective knuckle.

15. The wheel suspension system of any one of Claims 1 to 14, wherein the distance between each pair of right and left pairs of upper and lower proximal suspension axes is smaller than the width of the front steering base, so as to mitigate the angle differences formed between the left and right parallelogram structures.

16. A tiltable vehicle having a vehicle longitudinal axis, comprising: (a) a central frame extending along the vehicle longitudinal axis; (b) a front steering base assembled with the frame and having a central steering axis intersecting the vehicle longitudinal axis and defining therewith a plane perpendicular to a horizontal reference plane, and comprising a steering bore coaxial with the steering axis and traversing the entire length of the front steering base; (c) right and left front wheels with a latitudinal wheel axis therebetween perpendicular to said plane, and at least one rear wheel; (d) a front leaning wheel suspension system comprising - right and left parallel structures being spaced from each other and adapted to support at least indirectly, the respective right and left front wheels and operably connect the corresponding front wheel, separately from the other wheel and in a pivotable manner, to the front steering base, so as to enable common tilting and independent vertical displacement of said right and left front wheels, - a shock absorbing element interconnecting the right and left parallelogram structures and having a shock absorbing axis parallel to 285336/3 - 29 - 02813575106- the latitudinal wheel axis and being spaced from the latitudinal wheel axis and the front steering base in a frontward direction; and (e) a steering rod rotatably received within the entire length of said steering bore of the front steering base, such that tilting of said steering rod results in said suspension system being tilted together with said right and left wheels, respectively, and wherein rotation of the steering rod results in corresponding rotation of the right and left wheels.

17. The tilting vehicle of Claim 16, wherein each of the right and left parallelogram structures comprises: a. a pair of upper and lower suspension arms, each having a distal, knuckle engaging end and a proximal, frame engaging end pivotally connected to the front steering base by a corresponding proximal suspension axle of the steering base so as to pivot thereabout independently of the corresponding arm of the other pair; and b. a pair of right and left knuckle assemblies, each having upper and lower distal suspension axes parallel to the corresponding proximal suspension axes, and comprising a knuckle having a vertical knuckle axis, connected to the knuckle engaging ends of the corresponding suspension arms so as to enable the arms to pivot about the distal suspension axes.

18. The tilting vehicle of Claim 16, wherein the front steering base constitutes a portion of each of the right and left parallelogram structures and being parallel to the corresponding knuckle assemblies.

19. The tilting vehicle of any one of claims 16 to 18, further comprising: (f) a rear steering base assembled on said frame and having a rear steering axis extending along the plane and intersecting the vehicle longitudinal axis, and comprising a steering bore extending along the steering axis, wherein the at least one rear wheel is operably mounted thereto.

20. The tilting vehicle of Claim 16, wherein the at least one rear wheel is a right and left rear wheels and wherein the vehicle further comprising: (g) a rear independent leaning wheel suspension system comprising a right and left parallelogram structures adapted to support, respectively, said right and left rear wheels and operably connect them, separately from each other and in a pivotable manner, to the rear steering base, 285336/3 - 30 - 02813575106- so as to enable common tilting and independent vertical displacement of said right and left rear wheels, wherein the wheel suspension system having a shock absorbing axis parallel to the rear latitudinal wheel axle and extending to the rear of the rear steering base and interconnecting the right and left parallelogram structures.

21. The tilting vehicle of Claim 19 or 20, wherein the rear steering base is configured to enable towing of another vehicle, or wheeled luggage thereto via the steering bore of the rear steering base.

22. The tilting vehicle of any one of claims 19 to 21, wherein the front steering base and the rear steering base are identical in shape.

23. The tilting vehicle of any one of claims 19 to 22, wherein the steering axes of the front steering base and the rear steering base form different angles with the central longitudinal axis.