JPS5945865B2 - Toothed belt tension adjuster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tension adjuster for a toothed belt used for driving two or three wheels.

Power transmission by a toothed belt produces less noise than a steel chain, does not require lubrication, and is easier to maintain.
There are advantages such as keeping the belt and sprocket clean. However, in the case of a toothed belt, if the belt tension is too weak, it will cause tooth skipping, and if it is too strong, it will reduce the durability of the belt and sprocket bearings. Need to pay attention.

When a toothed belt is used in a two-wheeled motor vehicle, that is, when a toothed belt 5 is mounted on an engine sprocket 1 and a rear sprocket 4 pivoted on the rear wheel shaft 3 at the tip of the swing arm 2, as shown in FIG. As a general method of applying appropriate tension to the toothed belt 5, as shown in the figure, a weight 6 of a specified weight is lowered from above the toothed belt 5, so that the amount of deflection (δ) of the belt falls within the specified range. Loosen the lock nut 8 of the belt adjuster □ provided at the tip of the swing arm 2 as shown in Fig. 2, and screw in the adjuster bolt 9 to shift the rear wheel axle 3 rearward and apply appropriate tension to the toothed belt 5. As shown in Fig. 3, a spring-type tension meter 10 used for general V-held tension measurement is placed on the underside of the toothed belt 5, and the scale of the tension meter 10 falls within a specified range. Similarly to the above method, there is a method of shifting the rear wheel shaft 3 rearward using the belt adjuster □ to apply appropriate tension to the toothed belt 5.

These methods can relatively accurately apply appropriate tension to the toothed belt 5, so they are suitable for use by manufacturers and assembly lines. It is expensive to purchase a tension meter 10, and even if you have tension maintenance performed at a store, you will have to pay for repairs.

The present invention has been made in view of the above circumstances, and allows even a driver or an assembly line worker to easily apply appropriate tension to a toothed belt without using weights or tension meters, and has a simple structure. It is an object of the present invention to provide a tension adjuster for a toothed belt that can be manufactured at low cost.

The tension adjuster for a toothed belt according to the present invention penetratingly supports the rear wheel shaft so as to be able to slide in the longitudinal direction of the vehicle, facing one or both ends of the rear wheel shaft on which the toothed belt is mounted and the ground projector is pivotally supported. An elastic body is interposed between the rear end of the swing arm and an adjuster star body whose front end is supported by the rear wheel axle, and the elastic body displaces the rear wheel axle toward the rear of the vehicle body. It is characterized in that a prescribed appropriate tension is applied to the single-toothed belt.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a toothed belt tension adjuster according to the present invention will be described below with reference to the drawings.

As shown in FIG. 4, a toothed belt 5 is attached to the engine sprocket 1 and a grounding proget 4 which is pivotally supported on the rear wheel shaft 3 at the rear end of the swing arm 2. The rear end of the side swing arm 2 is equipped with a tension adjuster 11 according to the present invention. The details of an example of the tension adjuster 11 of the present invention will be explained with reference to FIGS. A U-shaped adjuster main body 14 with circular holes 13'' provided on both sides from the rear direction is fitted into the adjuster main body 14.
A washer 15 having an inner diameter slightly larger than the diameter of the rear wheel axle 3 is disposed on the outer surface of the rear wheel axle 3.
'' and the washer 15 and are tightened and fixed with a tightening nut 16.

An adjuster star bolt 9 with a lock nut 8 is threaded through the rear end of the adjuster main body 14, and a compression coil spring 21 for tension setting is built into a hole 25 provided at the tip of the adjuster bolt 9, which is attached to the rear of the swing arm 2. Pressing the edges. A scale 23 is engraved on the upper outer surface of the rear end of the swing arm 2, and correspondingly, an indicator scale 24 is engraved on the upper outer surface of the washer 15.

The compression coil spring 21 is designed so that a predetermined tension is applied to the toothed belt 5 when a certain load is applied and the spring is compressed to a predetermined size. On one side of the outside of the adjuster star body 14 is a viewing window 26 for observing the tip of the adjuster star bolt 9.
is provided. Next, a description will be given of the sequence of operations for applying appropriate tension to the toothed belt 5 using the tension adjuster of the embodiment constructed as described above. First, loosen the tightening nut 16 on the rear wheel shaft 3, and use the adjuster star bolt 9 to align the indication scale 24 of the washer 15 with respect to the scale 23 of the swing arm 2 at approximately the same position on the left and right sides. Adjust the alignment of the rear wheel shaft 3. Then, gradually tighten the adjuster star bolt 9 until its tip touches the rear end of the lining arm 2.

This state can be observed through the viewing window 26 provided in the adjuster main body 14. When the tip of the adjuster star bolt 9 hits the rear end of the swing arm 2, the compression coil spring 21 is compressed to a specified size, and a specified appropriate tension is applied to the toothed belt 5. And the scale 23 of the swing arm 2 on the left and right of the vehicle body
After confirming that the indication scale 24 of the washer 15 is at the same position, tighten the tightening nut 16 of the rear wheel axle 3 to fix the rear wheel axle 3 to the adjuster star body 14, and finally tighten the lock nut 8 of the adjuster star bolt 9. to secure the adjuster star bolt 9. Next, another embodiment of the tension adjuster according to the present invention will be described with reference to figures A and B in FIGS. 6 to 8.

The tension adjuster shown in FIGS. 6A and 6B has a compression coil spring 21 for tension setting built into a hole 27 provided at the rear end of the swing arm 2, and the tension adjuster shown in FIGS. It has the same structure as . Figure 7 A, b
In the tension adjuster shown in FIG. 5, a compression coil spring 21 for tension setting is fitted onto the outer periphery of a small-diameter rod 28 at the tip of the adjuster star bolt 9 that presses the swing arm 2. It has the same structure as the tension adjuster.

The tension adjuster shown in FIGS. 8A and 8B has a hole 29 extending to the rear of the adjuster star bolt 9, and a small-diameter guide hole 3 extending from the bottom of the hole 29 to the outer surface of the head of the adjuster star bolt 9.
0 is drilled through the rod 3, the compression coil spring 21 is accommodated in the hole 29, and a guide pin 31 is provided at the tip.
2 is received from the guide pin 31 side, and the guide pin 31 is inserted into the guide hole 30 through the inside of the compression coil spring 21 to hold the compression coil spring 21 between the rod 32 and the bottom of the hole 29. Holes through which the rear wheel shaft 3 passes through both sides of the main body 14 are made into circular holes 13'.

When applying appropriate tension to the toothed belt 5 in each tension adjuster shown in FIG. 6A, b and FIG. 7 A, b, the operation is exactly the same as that of the tension adjuster shown in FIGS. 5A, b. The explanation will be omitted.

Figure 8 A, b tension adjuster 1 and toothed belt 5
To apply proper tension to the rear wheel axle, first loosen the tightening nut 16 on the rear wheel axle 3, and use the adjuster star bolts 9 on the left and right sides of the vehicle body to align the indication scale 24 of the washer 15 with respect to the scale 23 of the swing arm 2 to approximately the same position on the left and right sides. Then, gradually tighten the adjuster star bolt 9, and the guide pin 31 of the rod 32 housed in the hole 29 of the adjuster star bolt 9 passes through the guide hole 3 through the head of the adjuster star bolt 9.
Tighten until it is located at the opening surface of 0. At this time, the compression coil spring 21 is compressed to a specified size, and a specified appropriate tension is applied to the toothed belt 5. 5. The indicator scale 24 of the washer 15 corresponds to the scale 23 of the swing arm 2 on the left and right sides of the vehicle body.
are in the same position, then tighten the tightening nut 16 of the rear wheel axle 3 to fix the rear wheel axle 3 to the adjuster star body 14, and finally tighten the lock nut 8 of the adjuster star bolt 9 to tighten the adjuster star bolt 9. Fix it. 5 to 8, the toothed belt 5 is given a prescribed appropriate tension as described above.
Each tension adjuster shown in the figure has circular holes 13' on both left and right sides of the adjuster main body 14 through which the rear wheel axle 3 passes, so the adjuster main body 14 plays the role of a stopper for the rear wheel axle 3. Become.

Therefore, even if the tightening nut 16 of the rear wheel shaft 3 becomes loose, the rear wheel shaft 3 will not move toward the engine sprocket, and the tension of the toothed belt 2 will not decrease. Partially modified examples of the tension adjuster of the present invention are shown in FIGS. 9 to 12.

The tension adjuster shown in FIG. 9 is constructed by inserting a spring retainer 35 into the outer periphery of the base of the rod 28 at the tip of the adjuster star bolt 9 which is attached to the tension adjuster shown in FIGS. 7A and 7B. When tightening the bolt 9, the compression coil spring 21 is prevented from rubbing against the tip of the adjuster star bolt 9, and the adjuster star bolt 9 can be tightened smoothly.

Incidentally, since the washer 15 is omitted in this tension adjuster 1, the indication scale 24 is engraved on the adjuster main body 14. The tension adjuster shown in Fig. 10A and b is as follows:
A compression coil spring 21 whose front and rear ends are held by spring retainers 37, 375 is disposed within the adjuster star body 14 between the rear end of the swing arm 2 and the adjuster star bolt 9,
The spring pressers 37, 3U are integrally provided with engaging protrusions 38, 38'' that engage with each other on their upper surfaces, respectively, and the operation of applying appropriate tension to the toothed belt 5 using these projections is similar to the embodiment shown in FIGS. 5 to 7. They are exactly the same.

However, the amount of compression necessary for the compression coil spring 21 to apply appropriate tension to the toothed belt 5 is confirmed when the distance between the tips of the engagement protrusions 38, 38'' of the spring holders 37, 3U becomes zero. When the compression coil spring 21 is compressed until the spacing between the two leading engagement protrusions 38, 38'' becomes zero, the toothed belt 5 is given appropriate tension. The tension adjuster 1 shown in FIG. 11 is a partially modified design of the tension adjuster 1 shown in FIGS. 10A and 10B.

That is, a convex portion 39 is formed on the outer surface of one of the spring retainers 37, and this convex portion 39 is formed in the notch 4 provided at the rear end of the swing arm 2.
0, and a recess 41 is formed on the outer surface of the other spring retainer 375.
The projection 42 formed at the tip of the adjuster star bolt 9 is fitted into this recess 41, and the adjuster star bolt 9 is inserted into the recess 41.
Even when the spring holders 37, 37'' are loosened, the spring holders 37, 37'' are securely held, and the compression coil spring 21 and spring holders 37, 37' are prevented from falling.The tension adjuster shown in Fig. 12A and b 1 is partially designed with the same purpose as the tension adjuster 1 shown in FIG.
Spring receivers 43, 43 are fixed on the outer surface of the opening, and a large diameter compression coil spring 21 is placed between the spring holders 37, 37''.
The outer peripheries on both the left and right sides of the holder are press-fitted and held. In this way, even if the adjuster star bolt 9 is loosened, the compression coil spring 21 is held by the spring receivers 43, 43, and the spring retainers 37, 3
There is no chance that it will fall with the 7゛. The tension adjusters in each embodiment are generally provided at both ends of the rear wheel shaft 3, but even if they are provided only at one end on the grounding projector 4 side, the toothed belt 5 will still meet the specified appropriateness. It is capable of applying tension.

Further, in each of the above embodiments, the compression coil spring 21 is used as the elastic body to apply appropriate tension to the toothed belt 5, but the invention is not limited to this. Even if it's a kimono, it's fine.

According to the toothed belt tension adjuster according to the present invention as detailed above, an assembly line worker can apply a specified appropriate tension to the toothed belt without using weights or tension meters as in the past. Furthermore, when the tension of the toothed belt decreases, the driving vehicle can immediately adjust the tension to a predetermined appropriate tension, and these operations can be performed very easily.

Furthermore, the toothed belt tension adjuster of the present invention has a very simple structure, can be manufactured at low cost, and is easy to install.

[Brief explanation of the drawing]

1 and 3 are diagrams showing a conventional method of applying appropriate tension to a toothed belt, respectively, FIG. 2 is a cross-sectional plan view of a conventional belt adjuster, and FIG. 4 is a tensioning method of a toothed belt according to the present invention. FIGS. 5 to 8 are schematic diagrams showing a toothed belt installation part of a motorcycle equipped with a tension adjuster, and FIGS. 5 to 8 show various embodiments of the tension adjuster of the present invention, and a is a front view, b is a cross-sectional plan view, FIG. 9 is a cross-sectional plan view showing a partially modified example of the tension adjuster according to the present invention, and FIG. 10 is a partially modified example of the tension adjuster according to the present invention; 11 is a cross-sectional view of the main part showing a partially modified example, and FIG. 12 is a cross-sectional view of the main part similarly showing a partially modified example, where a is a cross-sectional plan view and b is a front view of the main part. 1... Engine sprocket, 2...
Swing arm, 3... Rear wheel axle, 4...
Earth Pro Get, 5...Toothed Belt, 8.
...Locking nut, 9...Adjuster star bolt, 11...Adjuster adjuster 1, 12...
...Elongated hole, 13'...Circular hole, 14...
...Asia star body, 15...Washer one,
16... Tightening nut, 21... Compression coil spring, 23... Scale, 24... Indication scale, 25, 27, 29... ...hole, 26...
...Peep window, 28...Rod, 30...
...Guide hole, 31...Guide pin, 32...
... Rod, 37,3U ... Spring holder, 3
8, 38'... Engaging protrusion, 39... Convex portion, 40... Notch, 41... Concave portion,
42... Protrusion, 43... Spring receiver.

Claims (1)

[Claims] 1 At one or both ends of the rear wheel shaft that pivotally supports the rear sprocket on which the toothed belt is mounted, the rear end of the swing arm that supports the rear wheel shaft so that it can slide in the longitudinal direction of the vehicle and the front end of the swing arm that supports the rear wheel shaft Between the support adjuster body,
A toothed belt comprising an elastic body that displaces the rear wheel shaft toward the rear of the vehicle body, and which applies a predetermined appropriate tension to the toothed belt by tightening an adjuster bolt attached to the adjuster body. Tension adjuster.