JPS6021342Y2 - Dust guard for toothed belts in motorcycles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dust removal belt when a toothed belt is used to drive the driving wheels of a motorcycle.

When a toothed belt is used to drive the wheels of a motorcycle, if pebbles or mud get caught between the belt and sprocket, the belt and sprocket will wear out, significantly shortening their lifespan.

On the other hand, when using a toothed belt, the tension must be maintained at an appropriate level, so as the mileage increases, the belt's tension decreases and it is necessary to re-tension it to the appropriate tension.

To reduce belt tension, check visually or press with your fingertips.

This can be determined by methods such as using a spring-type tension measuring gauge, but either method is difficult to find unless a significant portion of the belt mounted between the engine sprockets and sprockets is exposed. .

For this reason, the present applicant has developed a dust guard for toothed belts that prevents pebbles and mud from getting caught in belts and sprockets, and also allows belt tension to be easily investigated.

Figures 1 and 2 show the drive part of the toothed belt equipped with the dust guard. 1 is the engine sprocket, 2 is the rear sprocket, 3 is the toothed belt mounted between both sprockets 1 and 2, and A swing arm supports a rear wheel 5 coaxially with the rear sprocket 2, and 6 is a safety cover that covers the upper belt 3a of the toothed belt 3 from above the rear sprocket 2 to the frame 10, and the safety cover 6 is the swing arm. It is supported by a bracket 4a fixed on the upper surface of the outer periphery of 4.

7 is a rear fender, 18 is a mudguard mat, and 9 is a dust guard, which is located at an appropriate interval above the lower bell (3b) of the toothed belt 3 and along the longitudinal direction of the belt 3b. It is supported by a bracket 4b fixedly attached to the lower outer circumference of the swing arm 4.

This dust guard 9 is plate-shaped, and one end thereof is curved upward on the side of the higher sprocket 2, and the other end is located slightly forward of the mudguard mat 8, and its width is equal to the width of the toothed belt 3. The width is the same or slightly wider.

By the way, the dust guard 9 only covers the upper surface of the lower belt 3b of the toothed belt 3, and the side surface on the rear wheel 5 side is open. Since the lower belt 3b is spaced long enough so that it does not come into contact with the dust guard 9 due to the swing of the arm 4, pebbles and mud that are scraped up by the rear wheel 5 and collide with the rear fender 7 are swept away by the dust guard 9. Not only does it fall, but some of it also jumps below the dust guard 9 from the side, rides on the tooth surface of the belt, and gets caught in the rear sprocket 2, damaging the toothed belt 3 and rear sprocket 2.

In addition, since the dust guard 9 is plate-shaped, the front and rear sides of the dust guard 9 bend vertically due to the vibrations of the motorcycle, causing friction with the lower belt 3b, which causes the teeth of the toothed belt 3 to wear out. There is a risk that the meshing with the sprocket 1.2 will become poor, causing tooth skipping and making it impossible to reliably transmit the driving force to the rear wheel 5.

The present invention was developed in view of these circumstances, and it prevents pebbles and mud from getting onto the tooth surface of the lower belt of the toothed belt from the side of the rear wheel, and also prevents the running of the motorcycle. It is an object of the present invention to provide a dust guard for a toothed belt which is prevented from being bent by moderate vibration.

An embodiment of the dust guard for a toothed belt according to the present invention will be described below with reference to FIGS. 3 and 4.

Since the same reference numerals in the figure as in FIG. 1 indicate the same parts, the explanation thereof will be omitted.

Reference numeral 11 denotes a dust guard according to the present invention provided along the longitudinal direction of the lower belt 3b of the toothed belt 3. This dust guard 11 is stronger than a type 1 bent plate, and its vertical side 12 is located behind the lower belt 3b. A bracket is arranged on the side of the wheel 5, and the horizontal side 13 is arranged above the lower belt 3b with a required interval, and the mounting bracket 14 provided on the upper surface is fixed to the lower surface of the outer periphery of the swing arm 4. 4b with bolts and nuts.

One end of the horizontal side 13 of this dust guard 11 on the rear sprocket 2 side is extended and bent upward along the outer periphery of the rear sprocket 2.
The outer peripheral surface of the front part is covered.

This extended bent portion 13' has a mounting bracket 15 provided on its outer surface.
It is supported by tightening and fixing it to a bracket 4c fixed to the outer peripheral inner surface of the swing arm 4 with bolts and nuts.

Since the dust guard 11 having such a structure covers not only the upper surface of the lower belt 3b of the toothed belt 3 but also the side surface on the rear wheel 5 side, it may be scraped up by the rear wheel 5 while the motorcycle is running, and the dust guard 11 may be scraped up by the rear fender. Even if the pebbles or mud that collided with belt 7 fall or bounce off to the side, they will not land on the tooth surface of the lower belt 3b or jump in from the side. Mud will not get caught in the rear sprocket 2, and the toothed belt 3 and rear sprocket 2 will not be damaged.

Moreover, the extended bent portion 13 of the horizontal side 13 of the dust guard 11
' covers the front outer circumferential surface of the rear sprocket 2, so pebbles and mud will not bite into or adhere to the teeth of the rear sprocket 2.
The mesh will be good.

In addition, the dust guard 11 is made of a '-shaped bent plate, so
Since the horizontal side 13 does not bend vertically and the vertical side 12 does not wobble left or right due to vibrations while the motorcycle is running, the tooth surface of the lower bell (3b) of the toothed belt 3 and the side edge of the rear wheel side No abrasion.

Incidentally, the vertical side 12 of the dust guard 11 in the above embodiment may be provided with a scale for roughly measuring the slack of the toothed belt 3.

Further, the dust guard 11 of the embodiment shown in FIGS. 3 and 4 is supported by fixing the mounting brackets 14 and 15 to the brackets 4b and 4c provided on the swing arm 4 with bolts and nuts. It is not limited to.

For example, as shown in FIG.
A vertical rib 20 is provided in the central longitudinal direction of the upper surface and in the central longitudinal direction of the outer surface of the extended bent portion 13', and a plurality of horizontal ribs 21 are provided on the vertical rib 20 at appropriate intervals so as to intersect in a criss-cross pattern,
Two horizontal ribs 21 located in the middle of the horizontal sides 13
A clamping part 22, 22' for attaching the dust guard is formed between the two horizontal ribs 21 located in the middle of the extended bent part 13'. Drill a bolt insertion hole.

Then, a bracket 23.23' is fixed by welding or the like to the lower outer surface and inner outer surface of the swing arm 4 corresponding to the clamping parts 22, 22' of the swing arm 4, and the dust guard 11 is attached to the bracket 23.23'. , the bolt insertion holes of the vertical rib 20 are aligned with the bolt insertion holes of the bracket 23 and 23', and the bolt 25 is inserted through this through the washer 24.
．． The dust guard 11 may be supported and fixed by screwing into a nut fixed to the back side of the bolt insertion hole 23'.

In this way, the dust guard 11 is attached to the bracket 23.
．． Since it is only fixed to 23' by bolting one place at a time, it does not take much time to assemble, and it can contribute to improving the work efficiency on the motorcycle assembly line.

Further, in the dust guard 11 of the embodiment shown in FIGS. 3 and 4, the front end of the horizontal side 13 may be extended to the position of the frame 10.

In this way, even if a pebble falling on the horizontal side 13 of the dust guard 11 rolls forward from the position of the mudguard mat 8, it can be prevented from falling onto the tooth surface of the lower belt 3b of the toothed belt 3.

As can be seen from the above explanation, the dust guard of the toothed belt of the present invention prevents pebbles and mud from falling on the tooth surface of the lower belt of the toothed belt, or from getting in from the side. Also, since pebbles and mud will not get stuck or get stuck on the front outer circumferential surface of the rear sprocket,
Pebbles and mud will not get caught between the toothed belt and the ratchet sprocket.

Therefore, the toothed belt and catcher sprocket mesh smoothly and will not be damaged.Also, the dust guard of the toothed belt of the present invention does not bend vertically or wobble from side to side due to vibrations while the motorcycle is running, so the toothed belt There is no friction with the lower belt, and therefore the toothed belt does not wear out, so there is no problem of poor engagement with the sprocket, no tooth skipping, and the transmission of driving force by the toothed belt is reliable. It has the effect of being carried out.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the dust guard of a conventional toothed belt in a motorcycle, Fig. 2 is an enlarged cross-sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a side view of a toothed belt according to the present invention. A side view showing one embodiment of the dust guard, Figure 4 is B-B in Figure 2.
FIG. 5 is a perspective view showing another example of the dust guard attachment means shown in FIGS. 3 and 4. 1... Engine sprocket, 2...
Rear sprocket, 3...Toothed belt, 3a
...Upper belt, 3b...Lower belt, 4...Swing arm, 1 at 4 b
, 4 c... Bracket, 5... Rear wheel, 6... Safety cover, 7... Rear fender -18... Mud. Kemat, 9...
・Conventional dust guard, 10...Frame, 1
1... Tast Guard of this invention, 12...
・Vertical side, 13...Horizontal side, 13'...
・Extended bent part, 14.15...Mounting bracket, 20
... Vertical rib, 21 ... Horizontal rib, 22.
22'... Clipping part, 23, 23'...
Bracket, 24...Washer, 25...
··bolt.

Claims (1)

[Scope of utility model registration request] In motorcycles that use toothed belts for driving wheels,
A bent plate formed by a horizontal side that covers the upper surface of the lower belt of the toothed belt and a vertical side that covers the side surface of the rear wheel side of the lower belt, and one end of the horizontal side of the bent plate in front of the rear sprocket. 1. A dust guard for a toothed belt in a motorcycle, characterized in that the dust guard is provided with an extended bent part that is extended and bent upward along the outer periphery of the part.