JPH0382693A - Rear wheel drive of motorcycle - Google Patents

Abstract

PURPOSE:To reduce a tensioner installing space by forming a tensioner part integratedly with a part near a bottom wall of an air cleaner case provided under a seat, which contacts a wrapping connector belt to regulate further rising of the connector belt when a rear wheel rises up to a prescribed position. CONSTITUTION:A carburetor 11 is connected to a suction passage of an engine 10, which is supported by a vehicle body frame 2, through a carburetor 11a, and to an air cleaner device 20 through a joint tube 19. The air cleaner device 20 is provided with an air cleaner case 21 where right and left disk-shaped cases 23, 24 are installed removably on right and left side surfaces of a central case 22. Besides, a battery case 22f is integratedly formed in a rack shape on the bottom wall of the central case 22, and a tensioner part 22g is integratedly formed on the bottom surface thereof. When a driving chain 4a is oscillated up to a prescribed height due to the upward movement of a rear wheel, the further rising of the driving chain 4a is regulated by the tensioner part 22g.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rear wheel drive device in which the rear wheel of a motorcycle is driven by a wrapped transmission band such as a chain or a belt, and particularly relates to a rear wheel drive device in which the rear wheel of a motorcycle is driven by a wrapped transmission band such as a chain or a belt. This invention relates to simplifying the tensioner structure to prevent the belt from loosening as the rear wheel rises.

[Conventional technology]

In a motorcycle, the front end of the rear arm is pivotally supported by a rear arm bracket formed on the vehicle body frame so that it can swing vertically, and the rear end of the rear arm pivots the rear wheel. I'm trying to move it up and down. In addition, for driving the rear wheels, the large sprocket on the rear wheel side and the engine side wheel sprocket located slightly forward of the pivot axis of the rear arm are connected using a transmission belt wrapped around a chain, etc. Many are designed to transmit engine power to the wheels.

However, with such a rear wheel drive system, there is a problem in that when the rear wheel moves significantly upward, the chain loosens, and in extreme cases, it may come off the sprocket.

Note that this problem occurs because the pivot point of the rear arm is located behind the engine side sprocket.

Therefore, in order to solve the problem of the above-mentioned chain loosening, a tensioner is conventionally attached to the body frame near the triangular shadow area formed by connecting the seat rail and the above-mentioned rear arm bracket with a backstay. A tensioner mechanism is adopted that restricts the lifting of the check 7 and thereby prevents the check 7 from loosening.

[Problem that the invention seeks to solve]

By the way, the above triangular area is the air cleaner, buffer,
It is common to mount other in-vehicle components, and it is desirable to leave as much space as possible for these in-vehicle components. However, the conventional tensioner mechanism described above requires space for the tensioner, which is a separate component. Therefore, the space for arranging other components is restricted accordingly.

The present invention has been made in view of the above-mentioned conventional situation, and it is an object of the present invention to provide a rear wheel drive device for a motorcycle that can significantly reduce the arrangement space for a tensioner and expand the arrangement space for other parts accordingly. .

[Means for solving problems]

The present invention is equipped with an air cleaner case below the seat.
In a rear wheel drive device for a motorcycle, the rear wheel is attached to the rear end of a rear arm that is swingably supported on the vehicle body, and the rear wheel is driven by a wrapped transmission band, wherein the bottom wall of the air cleaner case is provided. A feature is that a tensioner part is integrally formed near the rear wheel to come into contact with the wrapped power transmission band that rises with the rear wheel and restrict the rise.

[Effect]

According to the rear wheel drive device according to the present invention, since the tensioner portion is integrally formed near the bottom wall of the air cleaner case disposed below the seat, it is possible to restrict the rise of the wrapped transmission band as the rear wheel rises, and to prevent loosening. It can be suppressed to prevent it from coming off.

As mentioned above, the tensioner section of the present invention is integrally formed on the bottom wall of the air cleaner case, so compared to the case where the tensioner is provided as a separate part, the required installation space can be significantly reduced. The space for placing in-vehicle parts can be expanded.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 7 are diagrams for explaining a rear wheel drive device for a motorcycle according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a motorcycle in which the structure of this embodiment is adopted, and a head pipe 2a located at the front end of a body frame 2 of the motorcycle 1 has a front end of a main vibe 2b extending toward the rear of the vehicle at the upper part thereof. The upper ends of the down tubes 2C extending substantially vertically downward are welded and fixed to the lower part, and the portions of the main pipe 2b and the down tube 2C near the head pipe connection portions are vertical reinforcing pipes 2d, and the rear portions thereof are substantially connected to each other by welding. It is connected by a horizontal tension pipe 2e. Further, the front ends of a pair of left and right seat rails 2r are welded and fixed to the rear end of the main vibe 2b via a bracket 2g, and each seat rail 2f extends approximately horizontally to the rear end of the vehicle and is interconnected. has been done. Further, the upper ends of a pair of left and right rear vibes 2h are welded and fixed to the bracket 2g of the main vibe 2b, and each of the rear vibes 2h extends substantially vertically downward and is connected to each other by a cross pipe (not shown). ing. Further, the seat rail 2f and the rear pipe 2h are connected by a backstay 21 extending obliquely upward to the rear of the vehicle from the rear side of a pivot portion 5a that is a pivot point of a rear arm 5, which will be described later.

The head pipe 2a has a lower end that pivotally supports a front fork 3 that pivotally supports a front wheel so that it can be steered left and right, and the rear pipe 2h has a rear arm 5 that pivotally supports a rear end 4 that can be pivoted up and down. It is pivoted so that it can swing freely.

Further, a fuel tank 6 is mounted above the main vibe 2b so as to surround the pipe 2b, and a seat 7 is mounted above the seat rail 2f so as to cover the rail 2f. Note that 9b is a side cowl that covers the lower part of the seat 7, 9a is a wind guide plate that introduces running wind to the left and right sides of the fuel tank 6 and near the engine, and 8 is a rear cowl that surrounds the rear end of the vehicle.

The engine unit 10 is suspended and supported in a portion of the vehicle body frame 2 surrounded by the down tube 2C, tensile pipe 2e, and rear pipe 2a. This engine unit 10 is an air-cooled 4-stroke single cylinder,
The so-called 4 type has two intake and two exhaust valves.
It is a pulp engine. A drive chain 74a is wound between the drive sprocket 4b attached to one end of the drive shaft of the engine unit 10 and the driven sprocket 4C attached to the rear wheel 4, thereby controlling the engine output. The signal is transmitted to the rear wheels 4.

In addition, each intake passage 10M connected to each intake pulp of the engine unit 10 has a capacitor insert 11a.
A vaporizer 11 is connected via the multi-vaporizer 11.
is connected to one air cleaner device 20 via a pair of left and right joint tubes 19. The device 20
The air cleaner case 21 has a structure in which dish-shaped left and right cases 23 and 24 are detachably attached to the left and right side surfaces of a central case 22. The left side of this central case 22.

The right side and the left and right cases 23 and 24 are shock absorbers 18.
The joint tube 19 extends forward through the left and right sides of the shock absorber 18 to surround the shock absorber 18, and the rear end of the joint tube 19 is inserted and fixed into an extension of the central case 22.

A suction port 22b is formed in the top wall 22a of the central case 22, and a suction duct 25 is inserted into the suction port 22b and fixed with bolts. Also, central case 2
A partition wall 22c is formed to bulge upward at a portion of the bottom wall of No. 2 slightly in front of the suction port 22b. Further, partition walls 23a and 24a are formed in the left and right cases 23 and 24 so as to face the partition wall 22C.
Filter 26 so as to close communication port 22d formed in C
is installed. As a result, the air cleaner case 21
is divided into a primary side and a secondary side.

Further, the rear half of the right case 24 forms a buffer chamber 24C with the right side wall 22h of the center case 22, and the vi buffer chamber 24C has a communication hole 24b formed in the partition wall 24a.
This communicates with the secondary side of the air cleaner.

Furthermore, the rear end portion of the left case 23 is extended rearward, and the extension portion 23b has an L-shaped cross section, extending from inside the seat rail 2f and the back stay 21 to below the back stay 21. It is located across the mudguard and forms part of the mudguard. A holder plate 28 is welded and fixed to the seat rail 2f. A tool 27 is held on this holder plate 28 by a rubber band 29, so that the tool 27 is surrounded by an extension portion 23b and a side cowl 9b.

The battery case 2 is mounted on the bottom wall of the central case 22.
2f is integrally formed below in the shape of a shelf.

A pantry 30 is housed in this buffer case 22f, and the left case 23 and the frame reinforcing plate 31
It is fixed with a rubber band 32 hooked between.

Further, an electrical component 33 is mounted on the rear portion of the puffer case 22f, and a support boss portion 22i and a tensioner portion 22g are integrally formed on the bottom surface. This support boss portion 22i is fixed to the reinforcing plate 31 with a bolt 74b via a grommet 74a. Further, when the drive chain 74a swings to a predetermined height with the upward movement of the rear wheel 4, the tensioner portion 22g comes into sliding contact with the drive chain 74a and
Further increases in 4a are restricted.

Next, the effects of this embodiment will be explained.

When the motorcycle 1 is running, the rear arm 5 swings up and down depending on the road surface conditions, and the rear wheel 4 moves up and down. At this time, the pivot center of the rear arm 5 is the pivot portion 5a, while the pivot center of the drive chain 74a is the pivot portion 5a.
Since the drive sprocket 4b is located further forward, the drive chain 74a loosens as the rear wheel 4 rises. On the other hand, when the drive chain 43 rises to a predetermined position as the rear wheel 4 rises, its upper side comes into contact with the tensioner part 22g and is prevented from rising any further, thereby suppressing the loosening of the drive chain 74a. be done.

As described above, in this embodiment, since the tensioner part 22g is provided to restrict the upward movement of the drive chain 4a, loosening of the chain 7 can be suppressed and accidents such as coming off can be prevented.

The tensioner part 22g is not made as a separate part as in the conventional case, but is integrally formed at the bottom of the buffing case 22f, which is integrally formed with the central case 22. Therefore, the installation space is saved compared to the case where the tensioner part 22g is arranged as a separate part. In the case of this embodiment, which can be significantly reduced and therefore effectively utilize the space below the seat as a space for arranging other vehicle components, the battery case 22f can be lowered and the air cleaner capacity can be increased accordingly.

Further, the case rigidity of the portion where the tensioner portion 22g is formed is improved by the battery 30 disposed above the portion, and can sufficiently withstand the impact when the drive chino 4a comes into contact with the tensioner portion 22g.

In addition, since the location of the tool 27 is surrounded by the rear extension 23b of the left case 23 and the side cowl 9b, the tool can be taken in and out by simply removing the side cowl 9b, making operation simple and easy. The structure protects tools from splashing mud, etc.

In the above embodiment, the air cleaner case is provided with a buffing case, and the tensioner part is integrally formed at the bottom of the case. However, the tensioner part of the present invention may of course be formed directly on the air cleaner case. In this case, the air cleaner capacity can be further increased. If the capacity can be expanded or if the capacity is not so necessary, the seat height can be lowered by lowering the air cleaner case and improving the handling of the vehicle.

〔Effect of the invention〕

As described above, according to the rear wheel drive device for a motorcycle according to the present invention, since the tensioner part is integrally formed near the bottom of the air cleaner case, compared to the case where the tensioner is installed as a separate part, The arrangement space can be significantly reduced, which has the effect of securing arrangement space for other in-vehicle components.

[Brief explanation of drawings]

1 to 7 are diagrams for explaining a rear wheel drive device for a motorcycle according to an embodiment of the present invention, in which FIG. 1 is a left side view, and FIG. 2(1)) is a sectional view taken along the nb-nb line of FIG. 1, FIG. 3 is a plan view, FIG. 4 is a sectional side view, and FIGS. 5 and 6 are respectively FIG. 3 is a sectional view taken along the line ■-v, a sectional view taken along the line Vl-VI, and FIG. 7 is a left side view of a motorcycle to which this embodiment is applied. In the figure, 1 is a motorcycle, 2 is a body frame, 4 is a rear wheel, 4a is a drive chain (wrapped transmission band) 5 is a rear arm 1.7 is a seat, 21 is an air cleaner case, and 22g is a tensioner portion.

Claims (1)

[Claims] (1) The rear wheel of a motorcycle is equipped with an air cleaner case mounted below the seat, and the rear wheel is pivotally supported at the rear end of the rear arm which is pivotally supported to the body frame so as to be able to swing up and down, and the rear wheel is driven by a wrapped transmission band. In the rear wheel drive device, a tensioner portion is integrally formed near the bottom wall of the air cleaner case to come into contact with the wrapped transmission band when the rear wheel rises to a predetermined position and restrict the further rise of the transmission band. A rear wheel drive device for a motorcycle, which is characterized by: