JP3493465B2 - Rear fender structure of scooter type motorcycle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear fender structure of a scooter type motorcycle. 2. Description of the Related Art In a scooter type motorcycle equipped with a unit swing type engine, an air cleaner is often arranged on a side of a rear fender.
The air cleaner is provided with a predetermined gap between the air cleaner and the rear fender. [0003] However, if the air cleaner is installed away from the rear fender as described above in a scooter-type motorcycle which is limited in the installation space for the equipment, the capacity of the air cleaner is limited, and the capacity is reduced. To increase the size, the outer cover shape must be changed. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a rear fender for a scooter-type motorcycle which can ensure a sufficiently large capacity of an air cleaner without being restricted by the shape of an exterior cover. It is to provide a partial structure. [0005] In order to achieve the above object, the present invention provides a scooter type motorcycle in which an air cleaner mounted on a transmission case of a unit swing type engine is arranged on a side of a rear fender. A part of a side surface of the rear fender facing the air cleaner is notched, and the rear fender is provided on both sides of the notch.
Unit swing type engine through the bracket
And a part of the end wall of the air cleaner facing the notch of the rear fender is fitted into the notch of the rear fender so as to overlap with the rear fender. The feature is that a rear fender structure is configured by configuring a part thereof. According to the present invention, the air cleaner forms a part of the rear fender by being fitted into the notch of the rear fender so that a part of the end wall thereof overlaps with the rear fender. While maintaining a sufficient capacity, the capacity is ensured sufficiently large, and the scattering of muddy water and dust due to the rotation of the rear wheel is prevented by the air cleaner which also serves as a part of the rear fender. Also, the rear fender is notched
Brackets on both sides of the
Notch formed because it is connected to the engine transmission case
This compensates for the lack of rigidity of the rear fender. An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cutaway plan view of a rear fender portion of a scooter type motorcycle, FIG. 2 is a side view of the rear fender portion,
Figure 3 is a perspective view of the rear fender, 4 is a side view of a scooter type motorcycle, Fig. 5 is a partial plan view of the scooter type motorcycle. First, a schematic structure of the scooter type motorcycle 1 will be described with reference to FIGS. In FIG. 4, reference numeral 2 denotes a head pipe, into which a steering shaft 3 is rotatably inserted. A steering wheel 4 is attached to an upper portion of the steering shaft 3, and a front wheel 6 is rotatably supported by a lower portion via a front cushion 5. In FIG. 4, reference numeral 7 denotes a front fender, and reference numeral 8 denotes a front cowl. From the lower portion of the head pipe 2, one down tube 9 and two side tubes 10 extend rearward and downward. That is, the down tube 9 is provided at the center in the width direction of the vehicle body, and one end (front end) thereof is inserted into and welded to the joint 11 attached to a lower portion of the head pipe 2. The down tube 9 is connected to the joint 1
1 and extends obliquely downward, and its rear end is connected to the center in the width direction of a cross pipe 13 described later, as shown in FIG. On the other hand, the two side tubes 10
Disposed on both sides of the down tube 9, one end (front end) of each
Are inserted and welded to the side of the joint 11. Each side tube 10 is connected to the joint 1
After extending substantially horizontally from 1 toward the outside and outward, then bent at a substantially right angle and extending diagonally forward downward, bent again at a substantially right angle and extending diagonally downward toward the rear The main frame 12 is bent at an obtuse angle and extends obliquely upward and rearward, and the front end of the main frame 12 is inserted and bound to the rear end. The pair of left and right main frames 12 extend obliquely upward toward the rear, bend and rise sharply, and then bend again to extend obliquely upward toward the rear. As shown in FIG. 5, a cross pipe 13 is provided between the two main frames 12, and a reinforcing sub-frame 14 is provided between the cross pipe 13 and each of the main frames 12. The motorcycle 1 is equipped with a four-cycle unit swing type engine 15 as a driving source. The unit swing type engine 15 has a cylinder 16 inclined substantially horizontally, and one end of the cylinder 16 is provided with one end. The bracket 18 is connected to and suspended from a bracket 20 connected to the main frame 12 through a pair of left and right brackets 18 and links 19 pivotally connected to the respective brackets 18. or,
The other end (rear end) of the unit swing type engine 15 is
It is connected to and suspended from a bracket 22 attached to the main frame 12 via a rear cushion 21. The unit swing type engine 15
A rear wheel 23 is connected to an output shaft (rear axle) (not shown) extending horizontally inward from the rear portion of the transmission case 17. An upper portion of the rear wheel 23 is covered by a rear fender 24. ing. An air cleaner 25 is mounted on the transmission case 17 of the unit swing type engine 15 on the side of the rear fender 24, and a carburetor 26 is connected to the air cleaner 25. 27 is connected to the intake side of the cylinder 16. On the other hand, as shown in FIG. 4, a storage box 29 for storing a helmet 28, a seat 30, and a fuel tank 31 are provided above the unit swing type engine 15, and the fuel tank 31 is provided on the main frame. It is attached to a rectangular frame-shaped support frame 32 extending rearward from 12. A license bracket 33 is attached below the fuel tank 31, and a portion below the seat 30 is covered with an exterior cover 34. Here, the structure of the present invention will be described with reference to FIGS. In this embodiment, as shown in FIG.
A part of the rear fender 24 on the side where the air cleaner 25 is provided is cut out to form a notch 35, and the periphery of the notch 35 is bordered by a rib 35a. Note that, as shown in FIG.
4 is connected to the transmission case 17 of the unit swing type engine 15 via brackets 36 and 37 projecting from both sides of the notch 35 (see FIG. 2), and the other side is shown in FIG. 1 and is connected to and supported by a muffler 39 (see FIG. 6) via a bracket 38 shown in FIG. The notch 35 of the rear fender 24 has a flat end wall 25a of the air cleaner 25 and the rear fender 24 in a plan view as shown in FIGS.
In is fitted so as to overlap the end wall 25a constitutes a part of the rear fender 24. The air cleaner 25 has a structure in which divided pieces 25A and 25B are joined together, and a part 25A-1 of the divided piece 25A protrudes largely inward above the front portion of the rear fender 24. Also, the split piece 25
On the B side, a box 41 for storing the air cleaner element 40 is formed. In the box 41, a cylindrical air cleaner element 40 is fitted and stored along a frustoconical guide 42, After the air cleaner element 40 is stored, the box 41 is closed by a cap 44 which is connected by bolts 43.
The guide 42 has a plurality of ventilation holes 42a. Further, the box 41 has an inlet pipe 45 open to the atmosphere. Then, the inlet pipe 45 and the box 41 in the air cleaner 25
Except for constitutes a large capacity chamber 46,
The carburetor 26 is connected to the chamber 46 via an outlet pipe 47. In the air cleaner 25, as indicated by an arrow in FIG. 1, fresh air is drawn from the inlet pipe 45 into the box 41 by the intake negative pressure generated in the cylinder 16 of the unit swing type engine 15. The introduced fresh air is purified by passing through the air cleaner element 40, and then flows into the chamber 46 through the ventilation hole 42 a of the guide 42, and flows into the outlet pipe 4.
7 and is introduced into the carburetor 26 and used for air-fuel mixture formation. As described above, in the present embodiment, as described above, the air cleaner 25 forms a part of the rear fender 24 by fitting a part (end wall 25 a) into the notch 35 formed in the rear fender 24. , Exterior cover 34
Without changing the shape of the rear fender 24, the capacity of the air cleaner 25 can be ensured sufficiently large, and the scattering of muddy water and dust due to the rotation of the rear wheel 23 can be effectively prevented by the air cleaner 25 which also serves as a part of the rear fender 24. It comes off.
In this embodiment, since the rear fender 24 is attached to the transmission case 17 of the unit swing type engine 15 by the brackets 36 and 37 on both sides of the notch 35, the rear fender 2 is formed by forming the notch 35.
4 is compensated for the lack of rigidity. Here, the mounting structure of the license bracket 33 will be described with reference to FIGS. FIG.
7 is a side view of a license bracket portion, FIG. 7 is a rear view of the same, FIG. 8 is a perspective view of a portion A (insertion portion) in FIG. 6, and FIG. 9 is an enlarged sectional view of a portion B (bolt fastening portion) in FIG. . The license bracket 33 is an integrally molded product of a synthetic resin, and three insertion brackets 33a, 33b, 33a are protruded integrally at the tip of the license bracket 33 in the vehicle width direction. Thus, the three insertion brackets 33a, 33 projecting from the tip of the license bracket 33 are provided.
When the b and 33a are inserted into the cross pipe 48 which is bridged between the brackets 22 connected to the pair of left and right main frames 12, the insertion brackets 33a at both ends are connected to the cross pipe 48 as shown in FIG. The lower bracket is engaged with the center insertion bracket 33b, and the upper part of the cross pipe 48 is engaged with the license bracket 33. The license bracket 33 is inserted between the insertion brackets 33a, 33b and 33a so that the cross pipe 48 is sandwiched therebetween. Supported by The outer surface 3 of the license bracket 33
A projection 49 that is long in the width direction protrudes from the upper center of 3c, and a mounting boss 50 in the form of a concave groove is formed on both sides of the projection 49. As shown in FIG. 7, elongated mounting holes 51 are formed in both ends of the projection 49, and a circular mounting hole 52 is formed in each mounting boss 50. As described above, the front end of the license bracket 33 is inserted into the cross pipe 48, and the middle part of the license bracket 33 is connected to the support frame 32 by bolts 53 inserted into the mounting holes 52 of the mounting boss 50. It is easily attached by screwing to the attached bracket 54 (see FIG. 9). The license plate 33 is attached to the license bracket 33 by two right and left bolts 56 which are inserted into the mounting holes 51 of the projection 49, with the upper back surface of the license plate 55 being applied to the projection 49 of the license bracket 33.
Attached to. Thus, the license plate 55
Is attached to the license bracket 33, the two bolts 53 for attaching the license bracket 33 are covered by a license plate 55 and cannot be seen from behind. Therefore, the license bracket 33 cannot be removed by a third party operating the bolt 53. When the license plate 55 is not attached, the license bracket 33 can be easily removed by removing the bolt 53 and pulling the license bracket 33 backward. In this embodiment, the license plate 55
Mounting surface (the surface of the projection 49 is the license bracket 33
Away from the outer surface 33c of the
Since a predetermined gap is formed between the license bracket 33 and the license bracket 33, the muddy water collected in the mounting boss 50 flows down along the outer surface 33 c of the license bracket 33, and does not stain the license plate 55. Further, in this embodiment, since the license bracket 33 also serves to protect the fuel tank 31,
A dedicated component for protecting the fuel tank 31 is not required. In addition, since the insertion method is employed for fixing the front end of the license bracket 33, the attachment and detachment of the license bracket 33 is facilitated and the number of fixing bolts can be reduced. As is apparent from the above description, according to the present invention, there is provided a scooter-type motorcycle in which an air cleaner mounted on a transmission case of a unit swing type engine is arranged on a side of a rear fender. A part of a side surface of the rear fender facing the air cleaner is cut out, and the rear fender is provided on both sides of the cutout portion.
Unit swing type engine through the bracket
Of the air cleaner facing the notch of the rear fender, and fitted into the notch of the rear fender so as to overlap with the rear fender. The rear fender structure
The capacity of the air cleaner can be sufficiently large without being restricted by the shape of the outer cover , and
The lack of rigidity of the rear fender due to the formation of the notch
The effect of compensating is obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cutaway plan view of a rear fender portion of a scooter type motorcycle. FIG. 2 is a side view of a rear fender section of the scooter type motorcycle. FIG. 3 is a perspective view of a rear fender of the scooter type motorcycle . FIG. 4 is a side view of the scooter type motorcycle. FIG. 5 is a partial plan view of the scooter type motorcycle. FIG. 6 is a side view of a license bracket portion of the scooter type motorcycle. FIG. 7 is a rear view of a license bracket portion of the scooter type motorcycle. 8 is a perspective view of a portion A (insertion portion) in FIG. FIG. 9 is an enlarged sectional view of a portion B (bolt fixing portion) in FIG. 6; [Description of Signs] 1 Scooter type motorcycle 15 Unit swing type engine 17 Transmission case 24 Rear fender 25 Air cleaner 25a Air cleaner end wall 35 Notch

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-16967 (JP, A) JP-A-2-200588 (JP, A) JP-A-62-184977 (JP, A) JP-A-58-169977 49581 (JP, A) Japanese Utility Model Showa 57-118988 (JP, U) Japanese Utility Model Showa 60-69723 (JP, U) Japanese Utility Model Showa 49-143951 (JP, U) (58) Field surveyed (Int. ⁷ , DB name) B62J 15/00 B62J 39/00

Claims (1)

(1) A scooter-type motorcycle in which an air cleaner mounted on a transmission case of a unit swing type engine is arranged on a side of a rear fender, wherein the rear fender is opposed to the air cleaner. Cut off a part of the side surface to be cut, and attach the rear fender to both sides of the cutout.
The unit swing through a bracket protruding from the side
While being attached to the transmission case of the engine, the end wall of a part of the air cleaner facing the notch of the rear fender is fitted into the notch of the rear fender so as to overlap with the rear fender. A rear fender structure for a scooter-type motorcycle, comprising a part of the rear fender.