CN213008553U

CN213008553U - Front wheel suspension steering structure and motorcycle

Info

Publication number: CN213008553U
Application number: CN202022056207.4U
Authority: CN
Inventors: 刘正
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-04-20
Anticipated expiration: 2030-09-18

Abstract

The utility model provides a front wheel suspension steering structure and a motorcycle, which relate to the technical field of suspension, comprising a frame and a front wheel positioned in front of the frame, wherein a handlebar is arranged on the frame, and a steering vertical pipe is arranged below the handlebar; the utility model discloses 1) stress structure is reasonable, and shock resistance is strong, especially also possesses very good structure bearing capacity to the great transverse impact force with rocking arm direction of motion deviation. 2) The energy-absorbing device has the functions of buffering and absorbing transverse impact force, and further greatly increases the bearing capacity of the transverse impact force. 3) The front wheel steering tilt angle can be adjusted. 4) The support effect is better in the braking process.

Description

Front wheel suspension steering structure and motorcycle

Technical Field

The utility model belongs to the technical field of the suspension technique and specifically relates to a front wheel hangs and turns to structure and motorcycle.

Background

Current motorcycle front suspensions can be broadly divided in structure into two categories:

the first type: a sleeve-type front fork suspension structure; the basic functions include: supporting, buffering and steering. At present, most of front suspensions of motorcycles belong to a sleeve type front fork steering structure. The main disadvantages are: 1) the stress structure is not reasonable enough; the sleeve type front fork suspension structure has the defect of impact resistance, and has better impact bearing capacity under the condition that the direction of impact force is basically consistent with the direction of the sleeve, otherwise, the impact bearing capacity is reduced. 2) The supporting effect is poor in the braking process; because this kind of suspended structure can design into to the automobile body rear slope certain angle in order to reach better whole control effect in practical application, emergency braking in-process inertia is forward, and the suspended structure who inclines backward is compressed more easily, and the inclination is bigger the support force in the emergency braking in-process just is worse.

The second type: the work advancing direction of two A arm suspended structure, two A arm suspended structure is an pitch arc, and inclination is increasing gradually, and initial section advancing direction is close perpendicular upwards, and the braking in-process support effect is better, but stress structure is reasonable inadequately.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a front wheel hangs turns to structure and motorcycle to the unreasonable problem of suspension structure before solving current motorcycle.

The utility model discloses a realize like this: a front wheel suspension steering structure comprises a frame and a front wheel positioned in front of the frame, wherein a handlebar is arranged on the frame, and a steering vertical pipe is arranged below the handlebar, wherein the front wheel suspension steering structure comprises a front fork assembly, an upper cantilever assembly, a lower cantilever assembly, a steering synchronization assembly, an upper shock absorber and a lower shock absorber which are hinged with the frame;

the front fork assembly comprises at least one front fork piece, the front fork piece is provided with a front end hinged with the center of a hub of the front wheel, the top of the front fork piece is bent towards the front wheel side to form an upper cantilever support, a fixed shaft is arranged on the upper cantilever support, the axis of the fixed shaft points to the center of the hub of the front wheel along the radial direction of the front wheel, a shaft sleeve is sleeved outside the fixed shaft, and a steering connecting rod is arranged on the shaft sleeve;

the upper suspension arm assembly comprises at least one upper suspension arm having a front end articulated with the steering linkage and a rear end articulated with the frame; the free end of the upper shock absorber is connected with the front fork assembly or the upper suspension arm assembly;

the lower boom assembly includes at least one lower boom having a front end articulated with the front fork assembly;

the steering synchronization assembly comprises a steering synchronization rod, the top end of the steering synchronization rod is connected with the lower end of the steering vertical pipe through a universal joint, at least one steering wing plate is arranged on the outer side of the steering synchronization rod, the steering wing plate is hinged with the rear end of the lower cantilever arranged on the same side, and the free end of the lower shock absorber is hinged with a rod body of the steering synchronization rod; the rod body of the steering synchronous rod and the rod body of the fixed shaft are positioned on the same longitudinal surface.

Preferably, the number of the front fork pieces is two, the front fork pieces are respectively arranged on two sides of the front wheel, two ends of the upper cantilever support are respectively connected with the top ends of the two front fork pieces, and the two front fork pieces and the upper cantilever support are surrounded to form a frame-shaped structure.

Preferably, the number of the steering connecting rods is two, and the steering connecting rods are symmetrically arranged on two sides of the shaft sleeve respectively.

Preferably, the number of the upper cantilevers is two, and the two upper cantilevers are symmetrically arranged based on a vertical plane of the front fork assembly; the front ends of the two upper cantilevers are hinged with the two steering connecting rods respectively.

Preferably, a connecting shaft is arranged between the two upper cantilevers, and the free end of the upper shock absorber is hinged to the connecting shaft.

Preferably, the number of the lower cantilevers is two, and the lower cantilevers are symmetrically arranged on the basis of a vertical plane of the front fork assembly; the front ends of the two lower cantilevers are hinged with the rear ends of the front fork pieces on the same side.

Preferably, an axis of the steering synchronization lever is parallel to an axis of the fixed shaft.

Preferably, a hinged seat is arranged at the lower end of the steering synchronous rod, and the free end of the lower shock absorber is hinged with the hinged seat.

Preferably, the distance between the hinge position of the front end of the front fork piece and the hinge position of the rear end of the lower cantilever is equal to the distance between the hub center of the front wheel and the steering synchronization rod.

A motorcycle comprises the front wheel suspension steering structure.

Adopt above-mentioned technical scheme, the utility model has the advantages of:

1) the stress structure is reasonable, the impact resistance is strong, and the structure bearing capacity is very good especially for the transverse impact force with large deviation with the motion direction of the rocker arm.

2) The energy-absorbing device has the functions of buffering and absorbing transverse impact force, and further greatly increases the bearing capacity of the transverse impact force.

3) The front wheel steering tilt angle can be adjusted.

4) The support effect is better in the braking process.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic side view of the present invention;

FIG. 3 is a schematic structural view of the front fork assembly of the present invention;

FIG. 4 is a schematic structural view of the parallel arrangement upper boom assembly of the present invention;

FIG. 5 is a schematic structural view of the A-shaped arrangement of the suspension arm assembly of the present invention;

FIG. 6 is a schematic structural view of the steering synchronizing assembly of the present invention;

FIG. 7 is a diagram showing the effect of the movement path of the front wheels of different suspension systems under vertical impact;

FIG. 8 is a graph showing the effect of stress on the vehicle frame of different suspension systems under load.

And (5) effect diagrams.

In the figure: the steering mechanism comprises a frame, a front wheel, a handlebar, a steering vertical pipe, an upper shock absorber, a lower shock absorber, a front fork piece, an upper cantilever support, a steering connecting rod, a lower cantilever, a steering synchronous rod, an upper cantilever, a shaft sleeve, a steering wing plate, a cross universal joint, a connecting shaft, a hinge seat and a fixed shaft, wherein the frame is 1, the front wheel is 2, the handlebar is 3, the steering vertical pipe is 4, the upper shock absorber is 6, the front fork piece is 7, the upper cantilever support is 8, the steering connecting rod is 9.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1-5, the utility model provides a front wheel hangs and turns to structure, including frame 1 and the front wheel 2 that is located frame 1 the place ahead, be provided with handlebar 3 on frame 1, handlebar 3 below is provided with turns to riser 4, turns to the lower extreme fixed connection of the upper end of riser 4 and handlebar 3, turns to riser 4 and rotates along with handlebar 3's rotation.

Further, the utility model discloses a front fork subassembly, go up the cantilever subassembly, down the cantilever subassembly, turn to synchronous subassembly and with frame 1 articulated last bumper shock absorber 5 and lower bumper shock absorber 6.

Wherein, the utility model discloses a front fork subassembly includes at least one front fork piece 7, and front fork piece 7 has the front end with the wheel hub center articulated of front wheel 2. The upper suspension arm assembly comprises at least one upper suspension arm, the upper suspension arm is arranged on the upper portion of the front fork assembly, and the upper suspension arm is provided with a front end hinged with the front fork assembly and a rear end hinged with the frame. The lower cantilever assembly comprises at least one lower cantilever which is arranged at the lower part of the front fork assembly, and the lower cantilever is provided with a front end hinged with the front fork assembly.

Further, as an embodiment, the number of the front fork pieces 7 may be one, the front end of the front fork piece 7 is hinged to a rotating shaft at the center of a hub of the front wheel 2, the front fork piece 7 is disposed at one side of the front wheel 2, the top of the front fork piece 7 is bent towards the side of the front wheel 2 to form an upper cantilever support 8, a fixed shaft 18 is disposed on the upper cantilever support 8, the axis of the fixed shaft 18 points to the center of the hub of the front wheel in the radial direction of the front wheel 2, a sleeve 13 is sleeved outside the fixed shaft 18, and a steering link 9 is disposed on the sleeve 13. The tilt angle of the fork assembly, which is the tilt angle of the axis of the fixed axle 18, can be changed by adjusting the length of the lower shock absorber 6.

Further, as another embodiment, the number of the front fork pieces 7 may also be two, and the two front fork pieces 7 are respectively disposed on two sides of the front wheel 2, the upper suspension arm bracket 8 is disposed on the top of the two front fork pieces 7, and the two front fork pieces 7 and the upper suspension arm bracket 8 surround to form a frame-shaped structure. The number of the steering connecting rods 9 is two, and the steering connecting rods are respectively and symmetrically arranged on two sides of the shaft sleeve 13. Holes are arranged at the front ends of the two front fork blades 7, and the front ends of the two front fork blades 7 are hinged with a rotating shaft at the center of a hub of the front wheel 2 (the attached drawing is an embodiment drawing with the two front fork blades).

Further, the number of upper suspension arms 12 may be one, and one upper suspension arm 12 may be mounted on one side of the front fork assembly or on a vertical surface thereof. As an embodiment, when the number of the front fork 7 is one, the upper suspension arm 12 is arranged on the same side, and the front end of the upper suspension arm 12 is hinged with the steering connecting rod 9 on the front fork 7; as an example, when the number of the front fork 7 is two, the upper suspension arm 12 may be disposed at one side thereof and hinged to the steering link 9; as an example, when the front fork 7 is two in number, the upper suspension arm 12 may be disposed on the vertical plane thereof and hinged to the steering link 9.

Further, the number of the upper cantilevers 12 can be two, the two upper cantilevers 12 can be symmetrically arranged based on the vertical plane of the front fork assembly, the two upper cantilevers 12 have the same structure, and the front ends of the two upper cantilevers 12 are respectively hinged to the two steering connecting rods 9. As an example, the bodies of the two upper booms 12 are arranged parallel to each other; as another embodiment, the distance between the front ends of the main bodies of the two upper cantilevers 12 is smaller than the distance between the rear ends, and the main bodies are arranged in an a-shape, and a link connection is provided near the two front ends (the drawing is an embodiment with two upper cantilevers).

The utility model discloses be provided with bumper shock absorber 5, the one end of going up bumper shock absorber 5 is articulated with frame 1, and the other end is connected with the front fork subassembly or goes up the cantilever subassembly. As an example, the free end of the upper shock absorber 5 is hinged with the front fork piece 7 or the fixed shaft 18 of the front fork assembly; as another embodiment, a connecting shaft 16 is provided between the two upper cantilevers 12, and the free end of the upper damper 5 is hinged to the middle of the connecting shaft 16.

As an example, the upper suspension arm 12 is hinged to the steering link 9 in the following manner: the upper cantilever support 8 is in a round rod shape, a through hole is formed in the front end of the upper cantilever 12, and the front end of the upper cantilever 12 is sleeved on the upper cantilever support 8.

The upper suspension arm 12 can swing circumferentially with respect to the front fork assembly, centered on the hinge point with the upper suspension arm bracket 8. Under the combined action of the fixed shaft 18 and the steering link 9, the upper suspension arm 12 does not swing with the front wheel 2 when the front wheel is impacted and swung in the axial direction. The range of motion of the upper boom 12 is defined in a vertical space parallel to the frame 1.

Furthermore, the number of the lower cantilever 10 can be one, and the lower cantilever 10 is arranged on one side of the front fork assembly, and the front end of the lower cantilever 10 is hinged with the rear end of the front fork piece 7 on the same side. As another embodiment, the number of the lower suspension arms 10 may be two, and the two lower suspension arms are respectively disposed on two sides of the front fork assembly, and the front end of the lower suspension arm 10 on the same side is hinged with the rear end of the front fork 7 (the figure is an embodiment with two lower suspension arms). The lower cantilever 10 is hinged with the front fork piece 7 in the following way: a ball joint or universal joint connection is arranged between the front end of the lower cantilever 10 and the rear end of the front fork 7. The front fork piece 7 can drive the lower cantilever 10 to move back and forth or swing up and down, and meanwhile, the lower cantilever 10 can drive the front fork piece 7 to swing left and right to realize steering.

The utility model discloses still including turning to synchronous subassembly, turn to synchronous subassembly and including turning to synchronizing bar 11, turn to synchronizing bar 11's top and turn to riser 4 and be connected, it is preferred, turn to synchronizing bar 11 and turn to and adopt cross universal joint 15 to connect between the riser 4. At least one steering wing 14 is provided on the side of the carrier 11, and the steering wing 14 is hinged to the rear end of the lower boom 10. Preferably, the number of steering flaps 14 is the same as the number of lower booms 10. As an embodiment, the number of the lower suspension arms 10 is two, the number of the steering wing plates 14 is two, the rear ends of the two lower suspension arms 10 are respectively hinged with the outer ends of the steering wing plates 14 on the same side, and the hinging manner of the lower suspension arms 10 and the steering wing plates 14 is as follows: a ball joint or cardan joint is provided between the front end of the lower boom 10 and the outer end of the steering wing 14.

The utility model discloses be provided with down bumper shock absorber 6, the one end of bumper shock absorber 6 is articulated with the frame down, and the other end is articulated with the body of rod of steering synchronization pole 11. The hinge position of the lower shock absorber 6 to the frame 1 may be provided in the middle or lower part of the frame. As an example, a universal joint may be provided on the rod body of the steering synchronizing rod 11 to be hinged to the front end of the lower shock absorber 6; as an example, a hinge seat 17 is provided at a lower end of the steering synchronizing rod 11, and a free end of the lower damper 6 is hinge-coupled to the hinge seat 17. Preferably, the hinge connection position can be a spherical hinge or a universal joint structure.

Preferably, the body of rod of the steering synchronization rod 11 and the body of rod of the fixed shaft 18 of the present invention are located on the same longitudinal plane, and the axes of the steering synchronization rod 11 and the fixed shaft 18 are located on the vertical plane of the front wheel 2. The position of the central shaft of the hub is arranged at the front end of the steering shaft axis of the front wheel so as to obtain the dragging distance.

Preferably, the articulated mode of the upper suspension arm 12, the upper shock absorber 5 and the lower shock absorber 6 with the frame 1 of the present invention can adopt the common articulated mode in the field, and the above structure can be based on the pin joint circumferential rotation as the standard.

The utility model also provides a motorcycle, including above-mentioned front wheel suspension steering structure.

As shown in fig. 7, fig. 7 is a sleeve type front fork suspension structure, a double-a arm suspension structure and a suspension steering structure of the present invention from top to bottom. In the process of vehicle advancing, the front wheel is impacted vertically, under the sleeve type front fork suspension structure, the front wheel can only move upwards along the axial direction of the front fork in an inclined mode, and the moving direction of the front wheel and the advancing direction of the vehicle form an included angle a. And, two A arm suspended structure reach hang and turn to the structure, under last cantilever and lower cantilever supporting action, the front wheel fortune orbit is an pitch arc, at the initial stage of loading, the orbit of front wheel is close perpendicularly upwards, possesses better supporting action, the front fork structure is difficult to be compressed excessively.

As shown in fig. 8, the connection points of the telescopic front fork suspension structure, the double-a-arm suspension structure and the suspension steering structure of the present invention and the frame are located in the areas indicated by a1, a2 and A3, respectively. The connecting point of the sleeve type front fork suspension structure and the frame is limited by the structure and is gathered in the foremost area of the upper part of the frame, and the area needs to bear vertical and horizontal impact force at the same time, is stressed intensively and is easy to damage; similarly, although the double-A-arm suspension structure is connected with the frame at multiple points, all the connection points are still limited in the upper area of the frame, and the area needs to bear vertical and horizontal impact force at the same time, is stressed intensively and is easy to damage; and suspension steering mechanism, distribute in different regions about in frame the place ahead with the tie point of frame, the horizontal impact force that the front wheel receives is undertaken by cantilever assembly down, vertical impact force is undertaken by last cantilever assembly and last bumper shock absorber dispersion, stress structure is reasonable, shock resistance is strong.

The utility model discloses preferred embodiment does: the front fork assembly comprises two front fork pieces which are symmetrically arranged on two sides of the wheel, the front ends of the two front fork pieces are hinged with the center of the wheel hub of the wheel, and an upper cantilever support is arranged at the top of the two front fork pieces. The upper suspension arm assembly comprises an upper suspension arm which is arranged in an A shape, the front end of the upper suspension arm is hinged with a steering connecting rod on an upper suspension arm support, and the rear end of the upper suspension arm is hinged with the frame. The lower cantilever assembly comprises lower cantilevers symmetrically arranged on two sides of the wheel, a main body of each lower cantilever is in a straight rod shape, and the front ends of the two lower cantilevers are hinged with the rear ends of the front fork pieces on the same side. The steering synchronization assembly comprises a synchronization rod and steering wing plates symmetrically arranged on two sides of the synchronization rod, free ends of the two steering wing plates point to the lateral rear direction of the frame, and the free ends of the two steering wing plates are hinged to the rear ends of the lower cantilevers on the same side respectively. One end of the upper shock absorber is hinged with the upper part of the frame, and the other end of the upper shock absorber is hinged with a connecting shaft arranged on the upper suspension arm component. One end of the lower shock absorber is hinged with the middle part or the lower part of the frame, and the other end of the lower shock absorber is hinged with the rod body of the steering synchronizing rod. Preferably, the inclination angle of the front fork assembly is consistent with that of the steering synchronous rod; the distance between the front end and the rear end of the upper cantilever assembly is the same as that between the front end and the rear end of the lower cantilever; the horizontal distance between the hinge position of the front end of the front fork piece and the hinge position of the rear end of the lower cantilever is equal to the horizontal distance between the hub center of the front wheel and the steering synchronous rod 11.

The utility model discloses a theory of operation is:

1. shock absorption implementation mode

1) Vertical impact: when the vehicle runs on an uneven road, the upper cantilever and the lower cantilever swing up and down simultaneously by taking the respective rear end hinge points as centers. The front fork piece can move up and down under the condition that the inclination angle of the front fork piece is not changed and drive the front wheel to move synchronously. At the same time, the upper shock absorber mounted on the upper suspension arm assembly is compressed or released, and absorbs a portion of the impact force generated due to the unevenness of the road surface to keep the vehicle running smoothly.

2) Transverse impact: when the front wheel is subjected to transverse impact force, the impact force is finally transmitted to the lower shock absorber through the front fork assembly, the lower cantilever assembly and the steering synchronization assembly. When the lower shock absorber is inwards compressed, the steering synchronous component rotates backwards to change the inclination angle by taking the central point of the cross universal joint as a center. The front fork assembly rotates backwards by taking a hinge point of the upper steering connecting rod as a center (the inclination angle of the front fork assembly and the steering synchronous assembly is kept consistent), so that the inclination angle of the front fork is changed, and the front wheel moves backwards. After the backward impact force disappears, the resilience force of the lower shock absorber drives the steering synchronous component and the front fork component, and the lower cantilever moves reversely to enable the front wheel to move forwards.

2. Implementation of steering

1) Steering of the front wheels: when the steering mechanism is used for steering, steering force is transmitted to the steering vertical pipe through the handlebar, then transmitted to the steering synchronous rod from the cross universal joint at the lower end of the steering vertical pipe, the front fork assembly and a front wheel mounted on the front fork assembly are driven to synchronously rotate through the rotation of the steering synchronous rod through the lower cantilever assembly, and meanwhile, under the combined action of the fixed shaft and the shaft sleeve, the upper cantilever assembly cannot swing along with the front wheel. The rotation angle of the steering synchronizing component and the rotation angle of the front fork are always kept consistent, the lower cantilever is connected with the steering synchronizing component and the front fork component through a spherical hinge, and the steering synchronizing component and the front fork component have the functions of swinging up and down and swinging left and right.

3. Damping and steering are simultaneously realized

1) The upper and lower, front and back of front wheel, rotatory three direction simultaneous movement: when the vehicle is subjected to vertical impact force, the lower cantilever has the function of transferring steering force while transferring the impact force of a road surface to move up and down, and the motions in two directions are not interfered with each other. The inclination angle of the front fork assembly is consistent with the inclination angle of the steering synchronizing assembly main body when the front fork assembly is subjected to lateral impact force. The wheel rotates and moves up and down, and simultaneously has the function of changing the inclination angle of the front fork to realize the transverse movement of the front wheel.

The utility model has the advantages that:

1) the stress structure is reasonable, the impact resistance is strong, and the structure bearing capacity is very good especially for the transverse impact force with large deviation with the vehicle motion direction.

3) The front wheel steering tilt angle can be adjusted.

4) The support effect is better in the braking process.

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

Claims

1. A front wheel suspension steering structure comprises a frame and a front wheel positioned in front of the frame, wherein a handlebar is arranged on the frame, and a steering vertical pipe is arranged below the handlebar;

2. The front wheel suspension steering structure according to claim 1, wherein the number of the front fork pieces is two, the two front fork pieces are respectively disposed on both sides of the front wheel, both ends of the upper suspension arm bracket are respectively connected to top ends of the two front fork pieces, and the two front fork pieces and the upper suspension arm bracket are enclosed to form a frame-shaped structure.

3. The front wheel suspension steering structure as claimed in claim 2, wherein the number of the steering links is two, and the two steering links are symmetrically disposed on both sides of the boss.

4. The front wheel suspension steering structure according to claim 3, wherein the number of the upper suspension arms is two, and the two upper suspension arms are symmetrically arranged based on a central vertical plane of the front fork assembly; the front ends of the two upper cantilevers are hinged with the two steering connecting rods respectively.

5. The front wheel suspension steering structure as claimed in claim 4, wherein a connecting shaft is provided between the upper suspension arms, and a free end of the upper damper is hinged to the connecting shaft.

6. The front wheel suspension steering structure according to claim 2, wherein the number of the lower suspension arms is two, and the lower suspension arms are symmetrically arranged based on a vertical plane of the front fork assembly; the front ends of the two lower cantilevers are hinged with the rear ends of the front fork pieces on the same side.

7. The front wheel suspension steering structure as claimed in claim 1, wherein an axis of the steering synchronizing rod is parallel to an axis of the fixed shaft.

8. The front wheel suspension steering structure as claimed in claim 1, wherein a hinge seat is provided at a lower end of the steering synchronizing rod, and a free end of the lower shock absorber is hinge-connected to the hinge seat.

9. The front wheel suspension steering structure according to claim 1, wherein a distance between a hinge position of a front end of the front fork piece and a hinge position of a rear end of the lower arm is equal to a distance between a hub center of the front wheel and the steering synchronizing bar.

10. A motorcycle characterized by comprising a front wheel suspension steering structure according to claims 1-9.