JPH0698947B2 - Steering device for vehicles such as low-floor motorcycles - Google Patents

Description

TECHNICAL FIELD The present invention relates to a steering device for a vehicle such as a low floor type motorcycle.

(Prior Art) Generally, in a low-floor motorcycle, a front fork supporting a front wheel is rotatably supported by a vehicle body frame in a front portion of the floor, and a steering handle is connected to an upper portion of the front fork. ing. On the other hand, a seat is provided at the rear part of the floor, and the space on the floor is used as a foot space or a luggage space for the rider on this seat (for example, Japanese Utility Model Publication No. 58-36626).

(Problems to be Solved by the Invention) By the way, it is desirable that the foot space and the luggage space are wide to some extent so as to be able to accommodate the rider's driving posture and physique. Therefore, in the above configuration, it is possible to extend the floor by moving the support position of the front fork forward. However, if the support position of the front fork is moved forward, the front wheels will move forward and the wheel base will be lengthened accordingly, which may make it difficult to maneuver the vehicle and lose the agility when driving the vehicle. .

(Object of the Invention) The present invention has been made by paying attention to the above circumstances, and an object of the present invention is to make it possible to sufficiently secure a foot space and a luggage space of a vehicle body and to easily handle the vehicle. To aim.

(Structure of the Invention) A feature of the present invention for achieving the above-mentioned object is that a vehicle body frame has a steering shaft tube for supporting a front fork for supporting front wheels in a front portion of the vehicle body frame at substantially the center of the left and right sides. A seat is attached to the rear part of the body frame, and a footrest part that extends substantially horizontally in the front-rear direction and on which the rider rests his / her foot is provided on the upper surface side of the front-rear midway part of the body frame, and the front wheel is provided above the steering shaft tube. A low-floor automatic steering system provided with a steering handle for steering, and a connecting member for connecting the front fork and the steering handle by bypassing the space between the steering shaft tube and the steering handle on the front side of this space. In a steering device for a vehicle such as a two-wheeled vehicle, the front part of the body frame and the front-rear midway part are formed by a pair of left and right down tubes extending in the front-rear direction, and The right and left down tubes are bent forward and upward from the front end side of the corresponding left and right down tubes, and the steering shaft tube is attached to the front and upward parts of the left and right down tubes.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show the first embodiment, and 1 is a low floor type motorcycle. The body frame 2 of the motorcycle 1 has a steering shaft tube 3 in the front part thereof in the substantially left-right center thereof, and a connecting tube 4 projects from the steering shaft tube 3 to the left and right. The same as above, the body frame 2 has a pair of left and right down tubes 5, 5, the front part of each down tube 5 is connected to the projecting end of the connecting tube 4, and the rear part of each down tube 5 extends rearward. At the rear end, a seat pillar tube 7 is provided so as to project rearward and upward. A footrest portion 8 is provided on the upper surface side of the rear portion of each of the down tubes 5, 5 which is a midway portion in the front-rear direction of the vehicle body frame 2, and the footrest portion 8 extends substantially horizontally in the front-rear direction. From the front end side of the left and right down tubes 5, 5 corresponding to the footrest section 8, the left and right down tubes
5,5 is bent forward and upward, and the left and right down tubes 5,5
As described above, the steering shaft tube 3 is attached to the front ascending portion of the above through the connecting tube 4. A seat 9 is attached to the upper end of the seat pillar tube 7, which is the rear part of the vehicle body frame 2.

A front fork supporting the front wheel 11 on the steering shaft tube 3.
12 is rotatably supported. On the other hand, an engine 13 is pivotally supported at the rear end of the down tube 5. This engine
A rear arm 14 protruding rearward is provided at 13,
A rear wheel 15 is supported at the rear end of the rear arm 14,
The engine 15 is driven by the engine 13. A shock absorber 16 is installed between the seat pillar tube 7 and the rear arm 14.

The front ends of the down tubes 5, 5 extend forward of the support position of the front fork 12 with respect to the vehicle body frame 2. Then, a handle shaft tube 17 is supported at the extended end, and a steering handle 18 is rotatably supported by the handle shaft tube 17 via a handle shaft 19 supporting the steering handle 18.

Interlocking means 20 for interlockingly connecting the handle shaft 19 and the front fork 12 to each other is provided. The interlocking means 20 includes a rotating arm 22 screwed to the lower end of the handle shaft 19, and a pair of left and right interlocking rods installed between each rotating end of the rotating arm 22 and each side portion of the front fork 12. It is composed of 23 and 23. Each end of the interlocking rod 23 is connected to the pivotal end of the pivot arm 22 and the shoulder of the front fork 12 by ball joints 24, 24, respectively. Is adjustable.

The steering handle 18 is provided above the steering shaft pipe 3, and connects the front fork 12 and the steering handle 18 with the handle shaft pipe 17 and the handle shaft 1.
9, and the interlocking means 20 constitutes a connecting member. This connecting member bypasses the space between the steering shaft tube 3 and the steering handle 18 on the front side of this space, and this space is used as a foot space or a luggage space for the rider 26 on the seat 9.

Although the above is based on the illustrated example, the above configuration may be applied to a motorcycle with two rear wheels.

Each of the following drawings shows other embodiments. These embodiments will be described with respect to configurations different from those of the first embodiment, and common configurations will be denoted by reference numerals and the description thereof will be omitted.

3 to 5 show a second embodiment, and these drawings mainly show the support portion of the front fork 12 with respect to the vehicle body frame 2.

That is, 27 is a bracket plate, and this bracket plate 27 is installed between the left and right down tubes 5, 5.
An annular support disk 28 is screwed to the center position of the vehicle in the axle direction.

On the other hand, the front fork 12 is composed of a fork main body 12a and a steering shaft 12b protruding from the upper surface of the fork main body 12a. The steering shaft 12b is inserted into a through hole formed on the axis of the support disk 28, and the steering shaft 12b includes an upper disk 29 and a lower disk 30 that sandwich the support disk 28 from above and below. Is supported. A ball 32 is rotatably interposed between the support disk 28 and the upper disk 29 and between the support disk 28 and the lower disk 30. The front fork 12 is held on the axis of the support disk 28 through the ball 32 and is rotatable about the axis of the support disk 28.

According to the configuration of this embodiment, since the support portion of the front fork 12 with respect to the vehicle body frame 2 has a flat shape,
The floor 8 can be made more flat, and the foot space and luggage space can be made wider.

FIGS. 6 and 7 show the third embodiment, and these figures mainly show the interlocking means 20. That is, the pulley 33 is screwed to the lower end of the handle shaft 19. Further, a pair of left and right interlocking cables 34, 34 whose front end is connected to the pulley 33 and whose rear end is connected to the shoulder portion of the front fork 12 are provided. In this case, the rear end of the interlocking cable 34 is connected to the front fork 12 via the screw type length adjusting means 35, and the twisting operation of the length adjusting means 35 causes the interlocking cable 34 to be appropriately tensioned.

Further, guide means 37 is provided to prevent the interlocking cable 34 from coming out of the pulley groove of the pulley 33 by coming into contact with the middle portion of the interlocking cable 34.

That is, a bolt 38 is installed on the left and right down tubes 5, 5, and a pair of left and right rotary cylinders 40 are rotatably supported by the bolt 38 via a resin bush 39. And each rotary cylinder 40
Presses the middle portion of the interlocking cable 34 downward, and guides the interlocking cable 34 so as not to come out of the pulley groove of the pulley 33.

According to the configuration of this embodiment, since the front fork 12 and the handle shaft 19 are connected by the flexible interlocking cable 34, even if the difference in the mounting angle between the front fork 12 and the handle shaft 19 is large, this By matching the interlocking cable 34 with the front fork 12 and the handle shaft 19, the front fork 12 and the handle shaft 19 can be easily connected. Therefore, the degree of freedom for setting the caster angle, the angle of the handle shaft 19, and the mounting position can be further improved.

(Effect of the Invention) According to the present invention, the body frame has the steering shaft tube for supporting the front fork for supporting the front wheels at the front part thereof in the substantially left-right center, and the rider on the seat extends substantially horizontally in the front-rear direction. A foot rest on which the foot is placed is provided on the upper surface side in the front-rear midway portion of the body frame, and a steering wheel for steering the front wheels is provided above the steering shaft tube, and a steering wheel for steering between the steering shaft tube and the steering handle is provided. When a connecting member that connects the front fork and the steering handle is provided by bypassing the space on the front side of the space, a pair of left and right down tubes that extend forward and backward through the front portion of the vehicle body frame and the front and rear midway portions, respectively. It is composed of.

Therefore, since the front wheels are located between the left and right down tubes in a plan view, it is possible to prevent the left and right down tubes from interfering with each other in the vertical direction. It can be located low with the axial tube.

Therefore, since the steering shaft tube can be positioned lower, the space between the steering shaft tube and the steering handle can be enlarged, and a sufficient foot space or luggage space can be secured by this space.

Further, the left and right down tubes are bent forward and upward from the front end sides of the left and right down tubes corresponding to the foot rests, and the steering shaft tube is attached to the front and upward portions of the left and right down tubes.

Therefore, since the steering shaft tube is located near the footrest portion and the footrest portion is located at a low place, the steering shaft tube is also located low.

Therefore, also in this respect, the foot space and the luggage space can be sufficiently secured by the above-mentioned space as in the above.

Moreover, since it is the space above the steering shaft tube that enlarges the foot space and the like as described above, when the space is to be enlarged, the steering shaft tube and the front supported by the steering shaft tube are supported. It is not necessary to change the position of the fork forward. Therefore, there is an effect that the wheel base can be suppressed to a predetermined size, that is, the foot space and the like are enlarged as described above, but the vehicle can be easily handled.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIGS. 1 and 2 show the first embodiment thereof, FIG. 1 is an overall side view of a motorcycle, and FIG. 2 is a line II-II of FIG. FIGS. 3 to 5 show a second embodiment, FIG. 3 is a side sectional view of the support portion of the front fork with respect to the vehicle body frame, and FIG. 4 is IV of FIG.
Fig. 5 is a partial sectional view taken along the line IV-IV, Fig. 5 is a view taken along the line V-V of Fig. 3, Figs. 6 and 7 show a third embodiment, and Fig. 6 is a side portion of the interlocking means. A sectional view and FIG. 7 are partial sectional views taken along the line VII-VII in FIG. DESCRIPTION OF SYMBOLS 1 ... Motorcycle (vehicle), 2 ... Body frame, 3 ... Steering shaft tube, 5 ... Down tube, 8 ... Footrest part, 9 ... Seat, 11 ... Front wheel, 12 ... Front fork, 17 ... Handle shaft tube ( Connecting member), 18 ... Steering handle, 19 ... Handle shaft (connecting member), 20 ... Interlocking means (connecting member).

Claims (1)

[Claims] 1. A front portion of a vehicle body frame has steering shaft tubes for supporting front forks for supporting front wheels in substantially the center of the left and right sides of the vehicle body frame. A foot rest on which the rider puts his / her foot on the seat is provided on the upper surface side of the front and rear midway part of the body frame, and a steering handle for steering the front wheels is provided above the steering shaft tube. In a steering device for a vehicle such as a low-floor motorcycle, which is provided with a connecting member for connecting the front fork and the steering handle by bypassing the space between the steering wheel and the front side of the space, , The front-rear midway part is composed of a pair of left and right down tubes extending in the front-rear direction. A steering device for a vehicle such as a low-floor motorcycle, in which the untube is bent upward and the left and right down tubes are fitted with the steering shaft tubes.