JPH0310556B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to the mounting arrangement of a rear wheel shock absorber for a motorcycle.

[Prior Art] Figures 1 and 2 show a conventional motorcycle having a rear wheel shock absorber, which includes a vertical engine and a transmission mechanism, and a unit that pivotally supports the rear wheel 1. A case 2 is swingably supported via a support shaft 3 by a bracket integrally formed with an upwardly inclined rear portion of a frame 4 having a substantially U-shaped and low hollow shape. The rear wheel 1 and the unit case 2 are suspended via a buffer mechanism 6 interposed between the frame 4 on the lower rear side of the seat 5 and the rear end side of the unit case 2. There is.

[Problems to be Solved by the Invention] By the way, in the prior art as described above, the rear wheel 1 and the unit case 2 are connected to the seat 5.
Since the seat 5 is suspended via a buffer mechanism 6 interposed between the frame 4 on the rear side of the lower part and the rear end side of the unit case 2, the space on the rear side of the lower part of the seat 5 is covered by the buffer mechanism 6. Not only is it impossible to arrange other parts such as electrical equipment and storage compartments, but the seat position must be determined by considering the stroke of the buffer mechanism 6, so the seat must be placed at a fairly high position. Furthermore, since the frame 4 receives not only the seat load but also the force from the buffer mechanism 6, it was necessary to have a fairly sturdy structure.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and its purpose is to change the installation location of the shock absorbing mechanism to keep the height of the seat low and to An object of the present invention is to provide a rear wheel shock absorber for a motorcycle, which enables effective use of the space on the rear side of the lower part of the motorcycle, allows for a larger shock absorbing mechanism, and sufficiently protects the shock absorbing mechanism to prevent its damage. It is something to do.

[Means for Solving the Problems] In order to achieve the above object, the rear wheel shock absorber for a motorcycle of the present invention has the following features: A frame portion having a substantially U-shape and a low hollow shape is formed in the front portion of the seat; The upper front end of the unit case containing the vertical engine and transmission mechanism is pivotally supported on a bracket integrally formed on the upwardly sloping rear portion of the frame, and a buffer is provided almost horizontally near the bottom of the U-shaped frame. One end of the buffer mechanism is connected to the frame, the other end is connected to the lower front end of the unit case, and the lower part of the buffer mechanism is covered with a lower plate.

[Embodiment] FIG. 3 shows a scooter type motorcycle to which an embodiment of the present invention is applied, in which a front wheel 13 is connected to the front part of a frame 11 via a front fork 12.
is suspended and a steering handle 14 is provided. A seat 15 on which a driver can sit is fixed to the rear part of the frame 11. The frame 11 has a front portion of the seat 15 approximately U
It is said to have a low, wide, and hollow shape.

The upper front end of a unit case 17 is supported via a support shaft 16 on a bracket that is integrated with a portion of the frame 11 that slopes backward from a low hollowed portion. It is made to be able to swing against the other hand. The unit case 17 houses a vertical engine and a transmission mechanism, and also pivotally supports a rear wheel 18. A shock absorber 19, which is the main body of a shock absorbing mechanism including a spring, a damper, etc., is arranged substantially horizontally in a low hollow portion of the frame 11 on the front side relative to the seat 15. One end of the buffer mechanism including the buffer 19 is supported by a bracket 20 integrated with the frame 11 via a support shaft 21, and the other end of the buffer mechanism including the buffer 19 is supported by the unit case 17.
It is connected to a boss formed at the lower front end of the. That is, a first link 24 is swingably supported via a support shaft 23 on a bracket 22 that is integrated into a portion of the frame 11 sandwiched between the unit case 17 and the shock absorber 19. A shock absorber 1 is connected to one end of 24 via a connecting shaft 25.
The other end of the second link 27 is connected to the other end of the first link 24 via a connecting shaft 26, and the other end of the second link 27 is connected to the unit case via a connecting shaft 28. 17 front end boss portions are connected.

Further, the frame 11 and the shock absorber 19 are covered by an upper plate 29 and a lower plate 30 forming a box-shaped cross section, and the upper plate 29 serves as a footboard for the driver and the lower plate 3
0 functions as a protector against flying stones and the like while driving.

With the above configuration, when the rear wheel 18 moves up and down due to unevenness of the road surface,
The shock absorber 19 is compressed and expanded via the unit case 17, the first link 24, and the second link 27, and the spring of the shock absorber 19 absorbs vibrations from the road surface, and the damper of the shock absorber 19 absorbs vibrations from the road surface. Spring vibrations are reduced.

[Effects of the Invention] According to the present invention, since the buffer mechanism is arranged near the low hollowed out part of the frame in the front part of the seat, the space around the rear wheels on the rear side of the lower part of the seat is reduced compared to the conventional one. The opening is wider than the original, and it is possible to effectively arrange other members such as electrical equipment and storage cases in this area.

In addition, since the frame at the bottom of the seat is unrelated to the shock absorbing mechanism, there is no need to consider the stroke of the shock absorbing mechanism when determining the seat position, making it possible to place the seat at a fairly low position. Since the frame only receives a simple seat load, it does not need to have a very sturdy structure.

Furthermore, the upper part of the front end of the unit case containing the vertical engine and transmission mechanism is pivotally supported on a bracket formed integrally with the rear part of the frame that slopes upward, making the overall length of the vehicle relatively compact. Moreover, since the dead space at the lower front end of the unit case is effectively used for the shock absorbing mechanism, the shock absorbing mechanism can be made larger while the vehicle body is compact.

Furthermore, since the lower part of the shock absorbing mechanism is covered with a lower plate, the shock absorbing mechanism has the advantage that even if there are stones thrown from the ground while the vehicle is running, the shock absorbing mechanism is sufficiently protected and there is little risk of damage. It is something.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional rear wheel shock absorber for a motorcycle, Fig. 2 is a rear view thereof, Fig. 3 is a side view showing an embodiment of the present invention, and Fig. 4 is Fig. 3. 5 is a sectional view taken along the - line of Fig. 3.
A sectional view taken along a line, FIG. 6 shows a rear view of FIG. 11...Frame, 15...Sheet, 16...
Support shaft, 17...Unit case, 18...Rear wheel,
19...buffer, 30...lower plate.

Claims (1)

[Claims] 1. A unit case in which a vertical engine and a transmission mechanism are built into a bracket that is formed in the front part of the seat with a roughly U-shaped, low, hollow frame part, and is integrally formed in the upwardly sloping part of the rear part of the frame. A buffer mechanism is disposed approximately horizontally near the bottom of the U-shaped frame, one end of the buffer mechanism is connected to the frame, and the other end is connected to the lower front end of the unit case. death,
A rear wheel shock absorber for a motorcycle, the shock absorber having a lower portion covered with a lower plate.