JPS60219184A - Car body for 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 Technical Field of the Invention The present invention relates to a motorcycle body structure in which a front wheel moves backward and forward as the rear wheel moves up and down.

[Technical background of the invention and its problems]

BACKGROUND ART Conventionally, motorcycle bodies have been manufactured such that both front wheels and rear wheels are attached to a main frame at fixed positions, and the distance between the axes between the front and rear wheels is always constant. Furthermore, since the front @ suspension system and the rear wheel suspension system are independent, the movement of the front wheels and the movement of the rear wheels are unrelated and are configured to move independently. For this reason, even if the desired performance can be achieved under certain driving and acceleration conditions at the time of design, when driving on a highly uneven road surface, the vehicle body swings violently back and forth, which deteriorates ride comfort and handling performance. ,
In addition, drawbacks have been pointed out, such as unstable steering due to the forward leaning of the vehicle body due to the increased load on the front wheels during sudden braking, especially when driving in fields or mountains, or during intense driving such as races where driving at high speed is forced. Sometimes the above defects become dangerous and can lead to personal injury accidents.

[Purpose of the invention]

The purpose of this invention was to improve the above-mentioned drawbacks, and by moving the front wheels back and forth with respect to the main frame, the front wheel load is controlled and the center of gravity is completely moved. The auto-high vehicle body is capable of automatically adjusting the distance between the axles and moving the center of gravity in response to road conditions, acceleration, and deceleration by linking the forward and reverse movement of the rear wheels with the vertical movement of the rear wheels. [Summary of the Invention] In order to achieve the above object, the motorcycle body of the present invention has a front wheel axle attached to the main frame so as to be able to move forward and backward in the direction of travel. At the rear of the frame, the swing arm that suspends the rear wheel is connected to the forward and backward movement mechanism of the front wheel axle via a link mechanism and a hydraulic power transmission mechanism, so that when the rear wheel axle moves upward, the front wheel ◇ [Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each of the drawings shows an embodiment of the invention, and the one shown in FIG. 1 is an embodiment suitable for understanding the principle of the invention. In the figure, numeral 1 is a main frame having a fixed shape and a rigid structure. Reference numeral 2 denotes a steering head attached to the upper front of the main frame 1, and is rotatably supported horizontally with respect to the main frame 1 by a rotating shaft 2a. A front fork 4 is fixed to a mounting bracket 8 protruding from the steering head 2 and extends downward. A front wheel hydraulic cylinder 6 is attached to the lower end 4a of the front fork 4 to move the front wheel axle 5 back and forth horizontally along the direction of travel of the vehicle. It's o
6kl is the spring that pushes back the piston 6a'6 0
7 is a swing arm, and the base end 7a is rotatably supported in a vertical plane by a shaft 8 on the rear side of the main frame l.
A rear wheel axle 9 is attached to the tip 7bK. 10 is a rear wheel shock absorber, and this shock absorber 10 has a spring 11.
, consisting of a piston rod 12 and a rear wheel hydraulic cylinder 18, and is provided with both ends fully connected between the rear wheel axle 9 and the rear part of the main frame l. The rod 12 moves up and down. 14 is a hydraulic pipe, which connects the rear wheel hydraulic cylinder 1
8 and the front wheel hydraulic cylinder 6. In the motorcycle body of the present invention having the above structure, the front wheel axle 5 is moved back and forth by the front wheel hydraulic cylinder 6. 9 rises upward (in the direction of arrow P), and the piston 1B connected to the rear wheel axle 9 is pushed.
When the rear wheel hydraulic cylinders 18 are compressed, oil passes through the hydraulic pipe 14i and acts to cause the front wheel hydraulic cylinders IJ7 to retreat in the direction of arrow P toward the piston rod 6a'.

Further, when the rear wheel axle 9 descends in the opposite direction to the above-mentioned movement, the front wheel axle 5 moves forward due to the return force of the spring 6C in the front wheel hydraulic cylinder 6.

Next, the one shown in FIG. 2 is another embodiment of the present invention, in which the steering head is attached to the top and front of the main frame l so that it can rotate in the vertical direction with a two-metal rotating shaft 15. A front wheel axle retraction member 16' (5) with a U-shaped opening at the front in the lower part 1a (5, connected to the slide par 16a which is attached to the main frame la so as to be freely forward and backward) is connected by a horizontally rotatable pin 16b, and the rear of the slide par 16a is A link 7 that extends integrally with the end 16c and the swing arm 7
The movement of the swing arm 7 that rotates around the rotation axis 8 of the swing arm 7 is linked with the rear wheel axle 9 in the direction of the arrow (P). As the front wheel axle 9 is lowered, the front wheel axle retracting member 16 is pulled and the front wheel axle sb can be moved backward in the direction of the arrow (P).Furthermore, as the front wheel axle 9 is lowered, the front wheel axle 5 is moved forward.

What is shown in FIG. 8 shows another embodiment of the present invention,
A steering head 2 is attached to the front upper part of the main frame 1 so as to be rotatable in both the horizontal direction and the vertical direction.
5 rotates the steering head 2, moves the front fork 4't'', and moves the front wheel axle 5 forward and backward. 17 is carried out by pushing the upper fulcrum 18 of the rotation shaft 15 of the steering head 2 by the pushing force of the connecting rod 17 due to the upward displacement of the rear wheel axle 9. In this embodiment, the tilting of the front fork 4 @ By changing forward and backward at the same time, not only the forward and backward movement of the p1 front wheel but also changes in the caster angle and trail occur simultaneously.

Furthermore, another embodiment of the present invention is shown in FIGS. 4 and 5. The main frame 1 is divided into a front frame (IA) and a rear frame (IB) via a frame pin 19', and the main frame 1 is divided into a front frame (IA) and a rear frame (IB). In addition to making it rotatable, the front frame (-L
The horizontally rotatable steering head 2 installed at the front upper part of A) can be rotated with respect to the front frame (IA) and the rear frame (IB). The rotation of the swing arm 7 is transmitted to the front frame CIA) by all links 2o,
As a result, the front wheel axle 5'(i'') can be moved forward and backward in accordance with the vertical movement of the rear wheel axle 9. , when the front wheels hit an obstacle on the road such as a stone,
When the front wheels receive the load from the front and move backwards,
In addition to acting as a buffer, the rear wheels are pulled upwards in conjunction with this, so the rear wheels only have a small amount of contact with obstacles that the front wheels have overcome, allowing the vehicle to pass through the obstacles without hitting them. This has the effect of alleviating the impact exerted on the vehicle body by uneven road surfaces, and when accelerating, the front wheels tend to lift up, reducing the contact load between the front wheels and the road surface, which improves the turning performance of the front wheels. Unlike the conventional model, in which the center of gravity is lost, in the model of the present invention, the load applied to the rear wheel due to centrifugal force (G) during turning causes the rear wheel to sink and the front wheel to move backward, thereby reducing the distance between the axles between the front and rear wheels. By shortening the distance, increasing the road load on the front wheels, and moving the center of gravity forward, it is possible to prevent a decline in turning performance. When a horizontal load is applied to the front wheels from the front, the shock absorbers of the front wheels are compressed and the car body leans forward, making the car body unstable. 1 With the vehicle of the present invention, even if the front wheels sink during braking, the rear wheels sink as the front wheels move backward, so the entire vehicle body sinks horizontally, which lowers the center of gravity and allows brakes to be applied in a stable manner. Therefore, it has excellent effects such as being able to apply a strong braking force and significantly shortening the braking distance 1IIli.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and the first
(The figure is a side view showing one embodiment of the present invention, Figure 2 is a side view showing another embodiment of the present invention) Figure 8 is a side view showing another embodiment of the present invention, and Figure 4 is a side view showing another embodiment of the present invention. FIG. 5 is a side view showing another embodiment of the invention, and FIG. 5 is a side view showing another actual example of the invention. Ru0 1... Main frame La... Lower main frame IA... Front side frame IB... Rear frame 2... Steering head 2a... Same rotating shaft 8.
...Mounting bracket 4...Front fork 4a...Lower end 5...Front wheel axle 6...Front wheel hydraulic cylinder 〇a...Piston 6b
...Spring 7...Swing arm 7a...
Base end of swing arm 7C...Link 7b...Tip of swing arm 8...Axle 9...Rear wheel axle l
O...Buffer device 11...Spring 12...Piston rond 18...Rear wheel hydraulic cylinder 14...
・Hydraulic pipe 15... Rotation shaft 16... Front wheel axle retraction member 16a... Slide pan 16b... Horizontally rotatable bin 160... Rear end of front wheel axle retraction member 17... Connection rod 18 ...Upper fulcrum 19...Frame pin 20...Link. Patent Applicant: Yanagi Sawao, Zoui, Figure 1, Procedural Amendment, February 1980, Commissioner of the Japan Patent Office, Mr. Manabu Shiga■, Indication of the Case: 1982 Patent Application No. 75345, 2 Name of the Invention, Motorcycle Body 3 Relationship with the case of the person making the amendment Patent Applicant Address: 1-37-8 Komaba, Meguro-ku, Tokyo Name: Yuzo Yanagi Sawa ■ 5. Typed stamp of application and specification to be amended

Claims (1)

[Scope of Claims] (1) The front wheel axle is horizontally rotatably attached to the front of the main frame and is movable forward and backward in the direction of movement of the entire vehicle, and the rear wheel axle is vertically movable and is suspended at the rear of the seven main frames. A motorcycle body characterized in that a front wheel axle reversibly moves backward and forward in conjunction with motion. (2) The main frame is a hydraulic cylinder that extends below the horizontally rotatable steering head and is installed at the front end of the front fork to feed the front wheel axle back and forth, and a hydraulic cylinder that expands and contracts as the rear wheel axle moves up and down. A motorcycle body according to claim 1, wherein the motorcycle body moves together with a cylinder. (8) The main frame consists of a front fork that extends below the steering head that can rotate horizontally,
A front wheel axle support provided on the main frame so as to be freely forward and backward is horizontally rotatably connected, and the front wheel axle support and the rear wheel axle are connected via an IJ link mechanism. The main frame for the motorcycle described above consists of a steering head that can be rotated horizontally and vertically, and a mechanism that rotates the steering head in conjunction with the rotation of the swing arm that suspends the rear wheel. Motorcycle body according to claim 1 (5) The main frame is divided into front and rear parts and can be bent in the vertical direction via supports, and the front part is bent in the vertical direction with the rotational displacement of the swing arm provided on the rear frame. The frame rotates,
The motorcycle body O according to claim 1, which is horizontally rotatably mounted on the front frame and moves the front fork tip below the steering head back and forth.