JPS6319459A - Timing belt transmission device - Google Patents

Abstract

PURPOSE:To secure the power transmission by applying a coil spring onto a timing belt applied between a driving wheel and a trailing wheel, thus applying a proper tension onto the belt. CONSTITUTION:A coil spring 21 which is expandable in the direction of traveling of a belt and is applied onto the timing belt 11 open-applied onto a driving wheel 8 and a trailing wheel 10 so that the loosened side and the tightened side are set close each other, and the belt 11 is applied with a proper tension. Therefore, the timing belt 11 is applied with a pushing action by the coil spring 21 and always tightened, and generation of slip or gear slip is prevented. Further, the dispersion of the between-axis distance is absorbed by the extension and contraction action of the coil spring 21, and the belt 11 can be applied with a tension. Therefore, the certain power transmission of the belt is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a timing belt transmission having a feature in belt tensioning means.

[Conventional technology]

Conventional techniques for applying tension to reduce timing belt slippage and gear jump in belt transmission devices generally involve applying tension to the original vehicle 8 as shown in Figure 8 (al).
A lever 26 having an idle pulley 27 at one end and a spring 25 at the other end is attached only to the slack side of the belt 11 which is hung open on the driven vehicle 10, or to the slack side and the tension side as shown in FIG. 8 (bl). The idler pulley 27 is pivoted at 28 and acts to press the belt 11 from the outside.

The belt 11 is attached to the follower vehicle 10. Some windings around the original wheel 8 have a large central angle to ensure reliable power transmission.

(Problem to be solved by the invention) However, in the above belt tensioning means, the idler pulley 2
In addition to the lever 7 and the spring 25, parts such as a shaft 28 for pivoting the lever 26 and the lever 26 are also required.

The number of parts and assembly requires a large number of man-hours, the structure is complicated, and the idler pulley 27 is easily worn and lacks durability.

The present invention aims to solve these problems, and aims to improve the ease of assembling a belt tensioning mechanism while maintaining the reliability of timing belt transmission.

[Means for solving problems]

In order to achieve the above object, in the present invention, a coil spring 21 that is stretchable in the belt running direction is attached to the timing belt 11 that is hung open on the original vehicle 8 and the driven vehicle 10, with its slack side and tension side close together. Pass it through to bring it together, belt 11
This applies excessive tension to the.

[Effect]

In such a case, the timing belt 11 is always under tension due to the pressing action of the coil bone 21 passed through it, and there is no slippage or gear jump.

In addition, the expansion and contraction action of the coil spring 21 can absorb variations in the distance between the shafts, so that the belt 11 can always be kept under a predetermined tension. In other words, when two parts are assembled, the distance between the axles of the original vehicle 8 and the slave vehicle 10 may become larger or smaller than the standard value due to variations in parts or the like. As shown in Figure 3(b), if the center distance is larger than the standard value, belt 1
1 becomes stronger, the coil spring 21 is compressed and the length in the spring center axis direction is shortened to control the belt tension, and as shown in Fig. 3(a), if the belt tension is smaller than the standard value, the belt tension is The tension of the coil spring 11 becomes weaker, but the coil spring 21 expands accordingly, increasing its length in the direction of the central axis of the spring, thereby controlling the belt tension.

Furthermore, the coil spring 21 has a great effect of suppressing vibrations (dancing) of the belt 11. That is, vibration of the belt 11, especially on the slack side, can be suppressed to a certain extent by pressing the belt 11 with the idle booby IJ 27 as in the conventional belt tensioning mechanism described above, but the belt 11 can be suppressed to a certain degree by pressing the belt 11 with the idle booby IJ 27. Since the vibrations of the belt 11 are only held down by a single piece, there is a limit to the vibration suppressing effect of the belt 11. On the other hand, according to the coil spring 21, the length in the direction of the center axis of the spring can suppress the belt 11 in the longitudinal direction over a wide range, so that the effect of suppressing the vibration of the belt 11 is large. In addition, since the coil spring 21 itself is less likely to swing on the tension side where belt swing is less likely to occur,
This tension on the tight side can effectively suppress the movement on the loose side.

Furthermore, when assembling one assembly, the operation is extremely simple, as the coil spring 21 is simply passed through the belt 11 before the belt 11 is hung on the original vehicle 8 and the follower vehicle 10.

Moreover, the coil spring 21 can be assembled with just one.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 7 in the case where it is applied to a disc cleaner for cleaning discs such as digital audio discs (trade name: compact discs) and optical discs.

That is, in this embodiment, the timing belt transmission device of the present invention is employed in the drive mechanism of the disk cleaning body.

4 and 5, this disc cleaner 7 places a disc 3 on a disc mounting surface 2 formed on the upper surface of a main body case 1, and closes an opening/closing lid 4 that covers the upper part of the mounting surface 2. A cleaning body 5 rotatably supported on the inner surface of the lid 4 is pressed against the signal surface of the disk 3, and the rotation of the cleaning body 5 wipes away dust and fingerprints adhering to the disk surface. .

The cleaning body 5 is rotationally driven by a drive mechanism provided on the main body case 1 side, and the drive mechanism is a drive motor 6 arranged on the inner surface of the main body case 1 as shown in FIGS. 5 and 6. A timing belt 11 is hung open across a master vehicle 8 consisting of a worm gear meshed with a worm 7 on the shaft of the vehicle, and a follower vehicle 10 having an output gear 9 at its upper end.
The rotation of the drive motor 6 is transmitted to the driven vehicle 10. The follower vehicle 10 is.

A shaft 12 parallel to the axis of the original vehicle 8 is provided on the inner surface of the main body case 1.
The output gear 9 at the upper end of the driven vehicle 10 projects upward from the center of the disk mounting surface 2 .

On the other hand, on the inner surface of the lid 4, there is provided a cleaning body rotation mechanism 13 that receives rotation from the follower vehicle 10 and rotates the cleaning body 5 while revolving around its axis. This cleaning body rotation mechanism 13
A sun gear 14 and a two-turn disc 15 are fixed to the inner surface of the rotating block 15, and a planetary gear 16 is integrally protruded from the center of the upper surface of the rotating block 15. The timing belt 17 and the one-turn disc 15 are connected to the sun gear 14.
It consists of a support plate 18 that is rotatably supported around the center, that is, the center of revolution. The center of revolution ◯ is located on the center line of the disk 3 when the lid 4 is closed. The base end of the support plate 1 is rotatably mounted on the sun gear 14, and a support pin 19 is provided at the tip thereof to protrude downward, so that the rotation ≦15 and the planet gear 16 are rotatably connected to this pin 19. Supports insertion.

Since the cleaning body rotation mechanism 13 is driven by the driven vehicle 10 as described above, the input gear 20 is formed on the outer peripheral edge of the two-turn disc 15, and when 5M4 is closed, the input gear 20 is connected to the output gear 9 of the driven vehicle 10. I try to make sure they fit together.

In FIG. 4, when the follower vehicle 10 rotates in the counterclockwise direction A, the seven-turn plate 15 rotates in the clockwise direction B around the support pin 19. Further, the planetary gear 16 integrated with the rotary disk 15 also rotates in the clockwise direction B, causing the rotary disk 15 to revolve in the counterclockwise direction C while relatively rotating the timing belt 17.

At this time, if the timing belt 11 is simply hooked open on the original wheel 8 on the drive motor side and the follower wheel 10 on the cleaning body side, slippage will occur between the actual belt 11 and the original wheel 8/follower wheel 10, resulting in gear skipping. This may adversely affect the rotation of the cleaning body 5 on the surface of the disk 3, resulting in uneven wiping.

Therefore, the timing belt 11 slips.

In order to reduce gear jump, a cylindrical coil spring 21 is passed through the timing belt 11 between the original vehicle 8 and the driven vehicle jO, and this spring 21 brings the slack side and the tight side of the belt 11 closer to each other. Appropriate tension is applied to the belt 11 by pressing it with a shape.

To actually hang the timing belt 11, pass the coil spring 21 through the timing belt 11, and then
The driven vehicle 10 is first assembled at a predetermined position on the inner surface of the main body case 1, the belt 11 is applied to the driven vehicle 10 to be assembled first and the original vehicle 8 to be assembled later, and finally the original vehicle 8 is attached to the inner surface of the main body case 1. completely stop it. Incidentally, in order to ensure that the original car 8 is in mesh with the worm 7, the original car 8 and the worm 7 are assembled together with the chassis 22 on the drive motor 6 in advance. Fastening is accomplished by fixing the motor 6 onto the inner surface of the main body case 1 with screws 23 or the like.

At this time, if the motor 6 is fixed with screws, the original vehicle 8 may be misaligned, and this misalignment causes variations in the distance between the axes of the original vehicle 8 and the follower vehicle 10.

In such a case, the tension of the belt 11 will vary in strength, and the coil spring 21 will be compressed or expanded on the timing belt 11 as shown in FIGS. will be given.

When the coil spring 21 is formed into a cylindrical shape, it is easy to rotate on the timing belt 11.
21b in opposite directions and connect them to the main body case 1.
By making it come into contact with the inner surface of the shaft, the rotation is prevented.

In addition, an inner idle pin 2 is provided on the slack side and the tension side of the timing belt 11 between the driven vehicle 10 and the coil spring 21.
4 and 24, the center angle of the belt 11 wrapped around the driven vehicle 10 can be kept constant, making transmission more reliable. This inner idle pin 24 is connected to the main body case 1.
Since the lever 26. is simply rotatably or fixedly erected on the inner surface of the lever 26. It can be easily attached without requiring parts such as the spring 25. In addition, since the idle pin 24 disposed close to the driven vehicle 10 is disposed inside the belt 11, the belt 11 is
There is no need to deform the gear teeth in order to widen the pitch of the gear teeth, and therefore there is no need to worry about gear jump between the gear and the driven vehicle 10.

[Another example]

As shown in FIG. 7, the coil spring 21 may be wound to have a rectangular cross section.

〔Effect of the invention〕

As explained above, according to the belt transmission device of the present invention, excessive tension is applied to the belt 11 by simply passing the coil spring 21 through the timing bell (11) between the master vehicle 8 and the follower vehicle 10. The coil spring 21 has the advantage of ensuring reliable power transmission, being much easier to assemble than conventional idler pulleys, and having excellent durability as the coil spring 21 can extremely reduce wear on the belt 11. be.

[Brief explanation of drawings]

1 to 6 show an embodiment of the timing belt transmission device according to the present invention, and FIG. 1 is a plan view, and FIG.
The figure is a sectional view taken along line nn in Figure 1, and Figure 3 (a) (
b) is a plan view showing the operating state of the coil spring, FIG. 4 is a sectional view of the disk cleaner, FIG. 5 is a partially cutaway plan view of the disk cleaner, and FIG. 6 is a belt transmission device of the disk cleaner. FIG. FIG. 7 is a sectional view of a belt showing another embodiment of the present invention. 8) are both plan views showing a conventional belt transmission device. 8...Original vehicle. 10...Following car. 11...Timing belt. 21...Coil spring. 24...Idle pin. Inventor Masaaki Nagao Masaya Terayama Patent
Applicant Kyushu Hitachi Maxell Co., Ltd. Figure 3 (a) Figure 3 (b) Figure 6

Claims (2)

[Claims] (1) Open the timing belt 11 on the original car 8 and the driven car 10, and bring the slack side and the tight side of the timing belt 11 between the original car 8 and the driven car 10 closer together.
1. A timing belt transmission device characterized in that a coil spring 21 is provided, which is extendable and retractable in the belt running direction. (2) Inner idle pins 24 are arranged on the slack side and the tension side of the timing belt 11 between the driven vehicle 10 and the coil spring 21, respectively.
Timing belt transmission device as described in .