JPH0646788Y2 - Electric vehicle front wheel steering system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a front wheel steering system for an electric vehicle, which allows a passenger to have a wide leg space.

(Prior Art) There are various types of electric vehicles from two-wheeled vehicles to four-wheeled vehicles, and an example of a three-wheeled vehicle, which is relatively simple, will be described with reference to FIG. A floor frame 1 supports a front wheel 2 and a rear wheel (not shown), and a seat 3 is provided on an upper portion.
And bar handle 4. The front wheel 2 is pivotally attached to a fork 5 that rotates with respect to the floor frame 1 by a shaft 6, and the fork 5 is connected to the lower end of a handle shaft 7 having the bar handle 4 attached to the upper end thereof. . With this structure, if the occupant 8 seated on the seat 3 rotates the bar handle 4 in either the left or right direction,
The front wheels 2 can be directed in that direction via the forks 5. The driving force is transmitted to the rear wheels.

When the handle shaft 7 operates as described above, it is necessary to receive the vehicle weight and the weight of the occupant 8 with respect to the floor frame 1 and rotate smoothly with respect to the floor frame 1 and therefore is shown in the drawing. Thus, the upper and lower bearings 10 and 11 receive the space between the handle shaft 7 and the pipe 9 through which the handle shaft 7 passes, and the pipe 9 is supported by the brackets 12 and 13 to ensure smooth operation and sufficient rigidity. I'm going.

(Problems to be Solved by the Invention) With the above-mentioned configuration, the pipe 9 and the bearing 11 project largely above the floor frame 1, and the bracket 1
Since 2 and 13 require a large volume to maintain the strength, there is a problem that the leg space of the occupant 8 cannot be made sufficiently large. The present invention has been made for the purpose of solving this problem.

(Means for Solving the Problems) As a means for solving the above problems, the present invention provides a refraction of a floor frame in which an upper part of a fork having a front wheel attached to a lower part is bent upward and a front part is bent obliquely upward. It is arranged at the lower part of the section and is rotatably attached to the floor frame, and the lower part is parallel to the front shape of the floor frame, and the tip of the parallel part is bent upward, Provide a bar-shaped handle shaft with a bar handle attached to the upper end in a shape that is bent obliquely backward from the middle, and position so that the upper bent portion of the handle shaft comes to the front of the floor frame, and the lower end of the handle shaft It is attached to the upper part of the fork so that the bar handle rotation center is on the same line as the fork rotation center.

(Operation) With such a configuration, the front wheel support and steering mechanism can be housed only in the lower part of the floor frame, so that the leg space for the occupant can be widened. Since there is nothing protruding above the floor frame, getting on and off is significantly facilitated. And since the center of rotation of the bar handle is on the same line as the center of rotation of the fork, even though the handle shaft is rotating in front of the floor frame, it is similar to the conventional one that penetrates the floor frame. A steering feeling can be obtained.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 and the same members as those in FIG. All the components of the steering device are not projected on the upper part of the floor frame 1, and are all provided on the lower part of the floor frame 1. That is, on the lower surface of the floor frame 1, a disc-shaped inner plate 14 having a stepped portion on the peripheral edge is fixed, and an outer plate 15 also having a disc-shaped peripheral edge raised obliquely upward is opposed to the lower part of the inner plate 14. In the meantime, steel balls 16 are interposed between the stepped portion of the inner plate 14 and the upright portion of the outer plate 15 so as not to fall off. The inner plate 14 and the outer plate 15 have a central portion fastened together by a bolt 17 and a nut 18 to form a thrust bearing having a large diameter D that rotates about the bolt 17. Since the diameter D is large, the caster shaft (bolt 17) can be made short.

A fork 5 is fixed to the outer plate 15, and the front wheel 2 is supported by the lower portion thereof as in the case of FIG. Between the front part of the fork 5 and the bar handle 4, the lower end is fixed to the fork 5, and the middle part is rotated around the outside of the floor frame 1, that is, the lower part is the front part of the floor frame 1. They are in a parallel state, and the ends of the parallel portions are bent upward, and are joined by a handle shaft 19 that is bent obliquely from the middle to the rear. In FIG. 2, 20 is the floor frame 1.
The plate attached to the top of the, 21 is a battery that serves as a power source,
22 is a rear wheel.

The electric vehicle equipped with the front wheel steering device configured as described above is no different from that shown in FIG. 3 in the steering method. It feels different because the handle shaft 19 turns around the outside of the floor frame, but as shown by the center line A in FIG. 1, the rotation center of the bar handle 4 is located on the extension line of the bolt 17 which is the steering center axis. Since they are matched, there is no problem in terms of feeling. Further, since there is no protrusion on the floor frame, it is possible to operate in a comfortable posture (see FIG. 1) with the legs fully extended forward.

(Effect of the Invention) With the present invention, the steering mechanism is not provided on the upper part of the floor frame by the structure described above, so that a sufficient leg space can be secured on the upper part of the floor frame. The riding posture will be easier, and getting on and off will be easier. And as a structure for this, even though the handle shaft is shaped so as to rotate in front of the floor frame, the conventional handle shaft is You can drive with exactly the same feeling as if you are penetrating the floor frame.

[Brief description of drawings]

FIG. 1 is a side view showing a partial section of an essential part of one embodiment of the present invention, and FIG. 2 is a perspective view showing the overall appearance of the one shown in FIG.
FIG. 3 is a side view showing an example of a conventional electric vehicle in a partial cross section. 1 ... Floor frame, 2 ... Front wheel 4 ... Bar handle, 5 ... Fork 6 ... Axis, 19 ... Handle shaft

Claims (1)

[Scope of utility model registration request] 1. An upper portion of a fork having a front wheel attached to a lower portion,
The floor part has a front part bent obliquely upward and is arranged below the bending part so that the front part is rotatably attached to the floor frame and the bottom part is parallel to the front part of the floor frame. The tip of the parallel portion is bent upward, and a bar-shaped handle shaft with a bar handle attached to the upper end with a shape that is bent obliquely from the middle to the rear is provided, and the upper bent portion of the handle shaft is the floor frame of the floor frame. The electric motor is characterized in that it is positioned so as to come to the front, the lower end of the handle shaft is attached to the upper part of the fork, and the rotation center of the bar handle is on the same line as the rotation center of the fork. Front wheel steering system for vehicles.