JPS63222989A - Motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to two-wheeled motor vehicles, and in particular maintains a large driving force and obtains good cornering characteristics by increasing the contact surface of the tires. It is something. In the present invention, the term "inward" or "outward" refers to the direction toward the center of the turning center during cornering, and the direction opposite thereto is defined as outward.

[Background of the invention] Motorcycles corner by tilting the vehicle body, so-called banking. By adjusting the bank angle, the balance between centrifugal force and centripetal force can be adjusted.

In addition, round tires with a round cross section are used on the front wheels to make it easier to bank the vehicle for smooth cornering. Therefore, if a flat tire with a substantially U-shaped cross section with a large contact patch is used, banking becomes difficult.

[Purpose of the Invention] Therefore, the present invention makes it possible to use flat tires, etc., which can secure a much larger ground contact area than conventional round tires, and at the same time, the present invention enables the use of flat tires that can secure a much larger ground contact area than conventional round tires. It provides two-wheeled vehicles.

[Means for Solving the Problems] The motorcycle of the present invention has a lower body that is equipped with flat tires and that suspends front and rear wheels arranged on the body center line, and an upper body that has a handle and a seat. It is characterized in that the vehicle body is mounted so as to be swingable in the vehicle width direction.

[Operation of the Invention] In the motorcycle according to the present invention, when cornering, only the upper body of the vehicle is banked toward the center of the cornering to balance centrifugal force. At this time, the front and rear wheels are suspended from the lower body and do not bank, making it possible to use flat tires with a larger ground contact area than conventional round tires.

[Example] An embodiment of the present invention is shown in FIGS. 1 to 6.

As shown in FIG. 1, the two-wheeled motor vehicle according to this embodiment has a swing shaft 1 provided in the front and back direction at the bottom of the vehicle body.
A front wheel 3 is supported at the front of the vehicle via a swing arm 2, and a rear wheel 5 is supported at the rear via a swing arm 4. Both of these swing arms 2 and 4 are of a cantilever type. Further, a power unit such as an engine 6 is attached to the swing shaft 1 to form a non-banked lower vehicle body. Further, on the rear side of the swing axis 1, a step 7 for supporting the legs of the occupant is installed on the swing axis 1.
It is fixedly attached to the

The front wheel 3 and the rear wheel 5 are as shown in FIGS. 2 and 3, etc.
The tires are flat and have a large ground contact area, which means they can provide a large amount of driving force.

Further, an upper vehicle body 8 is attached to the swing shaft 1 so as to be swingable around the swing shaft. Also, as shown in the figure, between the swing axis l and the upper vehicle body 8, there is provided, for example, a Neidhardt rubber mechanism, etc., for controlling the swinging of the upper vehicle body 8 along the vehicle body center line C.
A return mechanism for returning to the o direction is provided as necessary.

The upper body 8 includes a seat 9 for supporting the occupant and a handle 1.
0, etc., and other parts necessary for operation are attached. The front wheels 3 are steered by a handle 10, and the angle of the rotating surface C1 of the front wheels 3 with respect to the vehicle body center line C8 is changed, but the mechanism for this purpose is not shown. however,
Various known mechanisms such as tie rods can be employed as appropriate.

In addition, as shown in FIG. 5, the rear wheel 5 has its rotating surface C2 tilted in the left-right direction with respect to the vehicle center line Co.
It is possible to steer the rear wheels. The rear wheel drive mechanism 11 for this purpose includes a dual-tooth gear 12 provided on the axle side of the rear wheel 5, and an ohm gear 1 disposed to mesh with the dual-tooth gear 12.
3 and a drive motor 14 for rotationally driving the same.

The ohm gear 13 and the drive motor 14 are attached to the swing arm 4 side. However, this drive mechanism 11 is only an example, and it goes without saying that various mechanisms can be employed.

As shown in FIG. 4, this drive mechanism 11 has a bank angle θ8
, the steering angle θ2 of the steering wheel, the vehicle speed V, and other information. That is, as shown in FIG. 1, a bank angle sensor 15 for detecting a bank angle θ1 around the swing axis 1 of the upper vehicle body 8, and a steering angle sensor 16 for detecting a steering angle θ2 around the rotation axis of the handle 10. Further, a speed sensor 17 for detecting the vehicle speed (2) is provided on each of the front wheels 3. Each of these sensors may be of various types known in the art, and a control section 18 is provided in the sensor. Information from these sensors is input to the control unit 18, and the rear wheel steering angle θ3 is determined by the control unit 18 according to a predetermined program. This rear wheel steering angle θ3 is output from the control section 18 to the drive mechanism 11, and rotates the drive motor 14 by a predetermined amount. As a result, the rear wheel 5 is rotated by 03.

Next, the operation of this embodiment will be explained. FIGS. 2 and 3 show a state in which the vehicle is running straight ahead, and the upper vehicle body 8 is still standing upright without swinging in the left-right direction. At this time, the rotational surfaces C and C2 of the front wheels 3 and rear wheels 5 are substantially aligned with the vehicle body center line C8.

Next, as shown in FIG. 5, when cornering to the right, the driver depresses step 7, banks the upper vehicle body 8 to the right around the swing axis 1, and starts cornering. At the same time, the steering wheel 10 and front wheels 3 are steered to the right, thereby directing the lower body of the vehicle to the right and maintaining cornering as a whole. In addition, a bank angle sensor 15,
The information on the bank angle θ1, steering angle θ2, and vehicle speed V detected by the steering angle sensor 16 and the speed sensor 17 is sent to the control unit 1.
8, the rear wheel steering angle 03 is determined by the control unit 18, and the drive motor 14 is rotated by a predetermined amount. Then, as the ohm gear 13 rotates, the double-tooth gear 12 is rotated by a predetermined angle, and the rotating surface C2 of the rear wheel 5 is tilted outward from the vehicle center line C8 by an angle corresponding to the rear wheel steering angle θ3. This allows the vehicle to actively steer from the rear of the lower body, making it possible to turn the vehicle in a much smaller radius.

In this embodiment, since the lower vehicle body does not bank, the flat type front wheels 3 and rear wheels 5 are used to increase the ground contact area. Therefore, it is possible to corner while maintaining a large driving force while increasing the grip force, thereby increasing cornering speed.

Since the step 7 is attached to the side of the swing shaft 1 that does not bank, the occupant can easily control the amount of bank of the upper vehicle body 8 by supporting his or her feet on this and using the reaction force. Furthermore, since the engine 6 and the like, which require a relatively wide width, are fixedly mounted on the swing shaft 1 side, the bank angle of the upper vehicle body 8 can be made sufficiently large. However, depending on the installation conditions,
It is also possible to make the engine 6 rotatable together with the upper vehicle body 8.

[Effects of the Invention] The motorcycle according to the present invention can balance centrifugal force by the bank of the upper body. Furthermore, flat tires with a much larger contact area than before can be used in the front and rear, making it possible to increase the contact area and achieve good cornering characteristics.

[Brief explanation of drawings]

1 to 6 show an embodiment of the present invention, FIG. 1 is a schematic diagram of the side surface of the vehicle body, FIG. 2 is a plan view thereof, FIG. 3 is an external view from the rear direction, and FIG. 4 is a block diagram. 5 is a schematic diagram of the side surface of the vehicle body during cornering, and FIG. 6 is an external view from the rear direction. (Explanation of symbols) 1... Swing axis, 3... Front wheel, 5... Rear wheel, 8
... Upper body, 9... Seat, 10... Handle. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] An automatic vehicle characterized in that an upper body including a handle and a seat is attached to a lower body that is equipped with flat tires and suspends front and rear wheels arranged on the center line of the body so as to be swingable in the width direction of the vehicle. Two-wheeled vehicle.