JP3529526B2 - Motorcycle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle for bolting a footrest to a lower portion of a crankcase of an engine. 2. Description of the Related Art Conventionally, in a motorcycle in which a footrest on which a driver's foot rests is fixed to a lower surface of an engine, a rod portion of the footrest is formed so as to extend in a lateral direction of a vehicle body below a crankcase. A mounting plate welded to the laterally extending portion is bolted to the lower surface of the crankcase from below. In mounting the mounting plate on the lower surface of the crankcase, a footrest fixing seat protruding downward is integrally formed at the rear portion of the lower surface of the crankcase, and the fixing bolt is attached to the footrest fixing seat with the mounting plate overlapped from below. It is inserted from below into the mounting plate and screwed onto the footrest fixing seat. [0003] In a motorcycle employing the above-mentioned footrest mounting structure, the footrest fixing seat protrudes downward from the lower surface of the crankcase of the engine, so that the motorcycle rides over a protrusion on the road. There has been a problem that the projection sometimes gets caught on the footrest fixing seat and easily collide. The impact at the time of the collision is also transmitted to the relatively thin wall of the crankcase bottom wall near the footrest fixing seat, so that if the impact is large, the bottom wall may be damaged. The present invention has been made to solve such a problem. In adopting a configuration in which a footrest is fixed to a lower portion of a crankcase, a projecting object on a road over which the footrest has passed is formed by a lower extension of a lower surface of the crankcase. An object of the present invention is to make it hard to be caught on a certain footrest fixing seat. [0005] A motorcycle according to the present invention is provided with an underguard having a main plate portion extending substantially horizontally from the front end of the lower surface of the crankcase to the rear of the vehicle body below the crankcase. fixed by footrest fastening fixing bolts rear of the underguard to the crankcase Te
The rear end of the main plate is attached to the flange of the mounting plate.
Together with overlapping from below, for covering substantially the entire area of the lower surface of the crankcase by a mounting plate of the underguard and footrest, it is unnecessary irregularities on the lower side of the crankcase eliminated. Therefore, when the motorcycle gets over a large projection hitting the lower part of the engine, the mounting plate of the underguard and the footrest slides on the projection. An embodiment of a motorcycle according to the present invention will be described below in detail with reference to FIGS. FIG. 1 is a side view of a motorcycle according to the present invention, FIG. 2 is a side view of an engine with an underguard according to the present invention attached, and FIG. 3 is a bottom view of the engine with an underguard and footrest attached. . 4A and 4B are views showing the underguard, FIG. 4A is a side view, and FIG.
FIG. 3C is a bottom view, FIG. 3C is a front view, and FIG. 3D is a sectional view taken along line DD in FIG. In these figures, reference numeral 1 denotes a motorcycle according to this embodiment. The motorcycle 1 is configured such that a foot space S is formed between a steering wheel 2 and a seat 3. ing. Reference numeral 4 denotes a front wheel of the motorcycle 1, and reference numeral 5 denotes a rear wheel. The front wheel 4 is suspended via a front fork 6 on a head pipe 7a of a vehicle body frame 7 so as to be steerable, and the rear wheel 5 is suspended on the vehicle body frame 7 via a rear arm 8 which can swing vertically. I have. The motorcycle 1 is provided with the front wheel 4
The engine 9 is mounted on a portion between the rear wheel 5 and the rear wheel 5.
This engine 9 is an air-cooled 4-cycle single cylinder type,
As shown in FIG. 2, the crankcase 10 includes a crankcase 10 and a cylinder 11 attached to an end of the crankcase 10 on the front side of the vehicle body so as to protrude substantially forward of the vehicle body. Reference numeral 12 denotes a crankshaft rotatably supported by the crankcase 10, 13 denotes a connecting rod, and 14 denotes a piston. A starter motor 15, a footrest 16 and an underguard 17 are provided at a lower portion of the crankcase 13.
Etc. are attached. The starter motor 15 is mounted on the front end of the vehicle body at the lower end of the crankcase 10, and the footrest 16 is mounted on the rear end of the vehicle body at the lower end of the crankcase 10. As shown in FIG. 3, the footrest 16 includes a rod-shaped portion 19 made of a tube material to which footrest rubbers 18 are attached at both ends, and a mounting plate 20 for fixing the rod-shaped portion 19 to the crankcase 10. ing. The rod-shaped portion 19 is formed so as to extend in the left-right direction of the vehicle body below the engine 9 so that both ends protrude to the side of the engine 9, and the mounting plate 20 is applied to a portion directly below the crankcase 10 from below. Welding. The mounting plate 20 is formed by press-molding a plate material into a shape in which the rod-like portion 19 can be fitted.
In the mounting state shown in FIG. 3, the structure extends from the rod portion 19 to both front and rear sides of the vehicle body. A part of the portion extending in the front-rear direction is formed in a flange shape having a longer extending dimension than the other portion, and the flange portion 20a is fixed to the footrest fixing seats 22 and 23 of the crankcase 10 by the footrest fixing bolt 21. (See FIG. 2). The footrest fixing seats 22 and 23 are integrally formed on the rear lower surface of the crankcase 10 so as to protrude downward from another portion (the bottom wall portion of the crankcase 10). The footrest fixing seat 22 is provided with the rod-shaped portion 19.
The footrest fixing seat 23 is disposed at two positions on the left and right sides of the vehicle body rear side of the rod-shaped portion 19. For this reason, the flange portion 20a is formed at a total of four places corresponding to the formation positions of the footrest fixing members 22 and 23, and the footrest fixing bolts 21 are also used in total of four. As shown in FIG. 3, the underguard 17 is structured so as to cover the lower surface of the crankcase 10 from below together with the starter motor 15, and has a front end and a rear end provided at the lower end of the crankcase 10. It is fixed.
The detailed structure of the underguard 17 will be described with reference to FIG. The underguard 17 is formed by pressing a metal plate to form a substantially flat main plate portion 17a, an upright portion 17b which rises upward from the front end of the main plate portion 17a on the vehicle body side, and a main plate portion 17b. A side plate 17c that rises upward from the left end of the vehicle body 17a is integrally formed, and a large number of round holes 24 are formed in substantially the entire area of the main plate 17a and the upright portion 17b. The under guard 17 has through holes 2 on both left and right sides of the rear end of the main plate portion 17a.
5, and mounting brackets 26 and 27 are protrudingly provided at the right and left ends of the upright portion 17b. The underguard 17 thus formed is
The rear end of the main plate portion 17a is fixed to the rear lower end of the crankcase 10 together with the footrest 16, and the mounting brackets 26 and 27 of the upright portion 17b are fixed by the underguard fixing bolts 28 (see FIG. 2).
To the front of the lower end of the. In this embodiment, the rear end of the main plate portion 17a of the underguard 17 is fixed to the crankcase 10 as follows. That is, as shown in FIG. 2, first, the mounting plate 20 of the footrest 16 is applied to the crankcase fixing seats 22 and 23 from below, and the mounting plate 20 is positioned on the front side of the rod-shaped body 19 with respect to the vehicle body. The rear end portion of the main plate portion 17a is overlapped with the flange portion 20a at the location from below. Then, the footrest fixing bolt 21 is connected to the main plate portion 1.
7a through the through-hole 25 from below, through the main plate portion 17a and the flange portion 20a.
Screw on 2. By attaching the underguard 17 to the crankcase 10 in this manner, the underguard 17
Extends substantially horizontally from the front end of the lower surface of the crankcase 10 to the rear side of the vehicle body and continues to the mounting plate 20 of the footrest 16. Further, in this embodiment, the lead wire 15a of the starter motor 15 passes between the main plate portion 17a of the under cover 17 and the lower surface of the crankcase and is led out to the rear of the vehicle body. In addition, as shown in FIG. 3, the lead wire 15a is wired so as to be substantially along the side plate portion 17c of the under cover 17. In the engine 9 with the footrest 16 and the undercover 17 attached in this manner, the mounting plate 20 of the footrest 16 and the undercover 17 cover substantially the entire lower surface of the crankcase 10. Therefore, there is no unnecessary unevenness on the lower side of the crankcase 19, and when the motorcycle 1 equipped with the engine 9 gets over a large projection that hits the lower part of the engine, the undercover 17 and the mounting plate 20 become You will slide on things. Further, in this embodiment, since a large number of round holes 24 are formed in the under cover 17, not only the weight is reduced, but also the rigidity of the main plate portion 17a and the upright portion 17b is reduced, and the protrusions are formed. It easily deforms when hit by an object. That is, the impact force transmitted to the footrest fixing seat 22 when the projection hits the under cover 17 is reduced. As described above, the motorcycle according to the present invention has a main plate portion extending from the front end of the lower surface of the crankcase substantially horizontally to the rear of the vehicle body at the lower side of the crankcase. solid by arranged to footrest fastening fixing bolts rear of the underguard to the crankcase a Dagado
After the main plate portion on the flange portion of the mounting plate
Since the end portions are overlapped from below, and the underguard and the footrest mounting plate cover substantially the entire lower surface of the crankcase, there is no unnecessary unevenness on the lower side of the crankcase. Therefore, when the motorcycle gets over a large projection hitting the lower part of the engine, the mounting plate of the underguard and the footrest slides on the projection. Therefore, even if the footrest fixing seat is configured to protrude downward from the lower surface of the crankcase, the projection does not catch on the footrest. Therefore, when the projection collides, the footrest fixing seat is relatively positioned near the footrest fixing seat. The impact force transmitted to the thin wall portion of the crankcase bottom wall can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a motorcycle according to the present invention. FIG. 2 is a side view of the engine with the underguard according to the present invention attached. FIG. 3 is a bottom view of the engine with an underguard and a footrest attached. FIG. 4 is a diagram showing an underguard. [Description of Signs] 10 ... crankcase, 16 ... footrest, 17 ... undercover, 20 ... mounting plate, 21 ... footrest fixing bolt.

Claims (1)

(57) [Claims] [Claim 1] At the rear lower surface of the crankcase of the engine
In a motorcycle in which a footrest fixing seat protrudes downward and a footrest is fixed to the fixing seat by bolting a mounting plate integrally formed with the footrest, a lower surface of the crankcase is provided below the crankcase. It disposed the a <br/> Ndagado having a main plate portion substantially horizontally extending vehicle body rear side from the front end to fix the rear portion of the underguard to the crankcase by footrest fixing bolt
The rear end of the main plate portion is attached to the flange portion of the mounting plate.
The motorcycle is characterized in that parts are overlapped from below , and substantially the entire lower surface of the crankcase is covered by the underguard and the mounting plate of the footrest.