JPH03134350A - Chain wheel for tension adjustment - Google Patents

Abstract

PURPOSE:To stabilize strength and to facilitate adjustment work by providing a slider which slides in a guide hole of a guide and by fixing the guide in the state that a chain wheel rotatably installed at the slider is engaged with a chain. CONSTITUTION:A chain wheel 1 is fitted with a shaft 6, and the axis 6 is fixed to a slider 10. The slider 10 is installed at a rectangular hole 12 provided at a guide 11 so that it slides in its longitudinal direction. The guide 11 is fixed to an installing plate 5 in the state that the slider 10 is fitted so that it slides. A tapped hole 15 is provided at the guide 11, the slider 10 is pushed by an adjusting screw 16, and the adjusting screw 16 is fixed to the guide 11 by a nut 17. Here, the chain wheel 1 installed at the slider 10 is pressed to a chain 2. And when the adjusting screw 16 is rotated, the slider 10 is moved in the longitudinal direction of the rectangular hole 12 of the guide 11, and tension of the chain 2 can be adjusted by changing the degree of pressing of the chain wheel 1 to the chain 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a tension adjustment chain wheel device for adjusting the tension of a chain of a chain transmission device.

[Conventional technology]

FIG. 5 is a plan view showing the structure of a conventional tension adjusting chain wheel device, and FIG. 6 is a front view showing the structure of a conventional tension adjusting chain wheel device.

To explain this with reference to FIG. 5, the chain wheel 1 is rotatably fitted onto a shaft 6, and the shaft 6 is fixed to a metal fitting 7. Also, adjust screw 3 on metal fitting 7.
One end of the adjustment screw 3 is implanted, and the other end of the adjustment screw 3 is fixed to the mounting plate 5 with pads 4A and 4B.

The tension of the chain 2 is adjusted by pressing the chain wheel 1 of the tension adjusting chain wheel device configured as described above against the chain 2, and adjusting the distance between the chain wheel 1 and the attachment Fi5 using the nuts 4A and 4B. It has become.

Figure 4 is a layout diagram showing an example of the use of the chain wheel device for tension adjustment.
1 is a chain wheel of the tension adjustment device, 2 is a chain, 8 is a driving side chain wheel, and 9 is a driven side chain wheel.

[Problem to be solved by the invention]

In the conventional structure, depending on the tension adjustment of the chain 2, the distance between the chain wheel 1 and the mounting plate 5 may become long, and in that case, the distance between the metal fitting 7 and the mounting plate 5 shown in FIG. 5 becomes long. Therefore, the bending rigidity of the adjustment screw 3 is reduced, and there is a possibility that the strength thereof may become unstable with respect to the load from the chain 2 that is applied to the chain wheel 1. Furthermore, when nuts 4A and 4B are loosened to adjust the tension of the chain 2, the adjustment screw 3 rotates and the parallelism between the chain wheel 1 and the chain 2 becomes incorrect. There was an operational inconvenience in that the nuts 4A and 4B had to be tightened while maintaining the parallelism between the chain 1 and the chain 2.

Therefore, an object of the present invention is to eliminate the above-mentioned instability in strength and inconvenience in adjustment work by providing a structure in which no bending load is applied to the adjustment screw 3.

[Means to solve the problem]

In order to achieve the above object, the tension adjusting chain wheel device of the present invention includes a guide having a rectangular guide hole, and a slider that fits into the guide hole without a gap and can slide in the longitudinal direction of the guide hole. , comprising a fixing means for fixing the slider to the guide at a desired position, and a chain wheel rotatably attached to the slider, and having a structure in which the guide is fixed in a state where the chain wheel and the chain are engaged. This solves the above problem.

[Effect]

In the conventional structure, the bending rigidity of the adjustment screw 3 decreases depending on the tension adjustment of the chain 2, and the parallelism between the chain and chain wheel becomes incorrect during adjustment work, as shown in Figure 5. This is due to the fact that the entire load is carried by the adjustment screw 3 alone.

In the structure of the present invention, the bending load received from the chain 2 is supported by the sliding surface between the guide and the slider, so there is no instability in strength, and the parallelism between the chain and chain wheel is also on this sliding surface. Since the chain 2 and the chain wheel 1 are guided by the chain wheel 1, the parallelism between the chain 2 and the chain wheel 1 does not go out of order during adjustment work.

(Example) Fig. 1 is a plan view showing the structure of the tension adjusting chain wheel device of the present invention, Fig. 2 is a front view showing the structure of the tension adjusting chain wheel device of the present invention, and Fig. 3 is a plan view showing the structure of the tension adjusting chain wheel device of the present invention. FIG. 2 is a side view showing the structure of the tension adjusting chain wheel device of FIG.

Fit the chain wheel 1 into the shaft 6 so that it can rotate freely, and connect the shaft 6 to the slider 1.
Fixed at 0. The slider lO is attached so as to slide in the longitudinal direction of a rectangular hole 12 provided in the guide 11.

As shown in FIG. 3, the groove 13 of the guide 11
Slide the protrusion 14 of slider 1.
It serves to prevent 0 from escaping from the guide 11. The guide 11 is fixed to the mounting plate 5 with the slider 10 slidably fitted therein. A screw hole 15 is provided in the guide 11, an adjustment screw 16 is screwed into the screw hole 15, and the slider 10 is pushed by the adjustment screw 16. The nut 17 is a lock nut for fixing the adjustment screw 16 to the guide 11.

The tension adjusting chain wheel device of the present invention is used in the following manner.

The chain wheel 1 attached to the slider 10 is pressed against the chain 2 as shown in FIG. By turning the adjustment screw 16 in this state, the slider 10 is moved in the longitudinal direction of the rectangular hole 12 of the guide 11, and the degree to which the chain wheel 1 attached to the slider 10 is pressed against the chain 2 is changed. to adjust the tension of chain 2.

〔Effect of the invention〕

In the conventional structure shown in FIGS. 5 and 6, the chain 2
Since all the load applied to the chain wheel 1 was borne by the adjustment screw 3, there was instability in strength and inconvenience in the adjustment work as described above, as shown in Figure 1.

According to the invention shown in FIGS. 2 and 3, the load applied from the chain 2 to the chain wheel 1 is transferred to the slider 10 and the guide 1.
1 and the adjustment screw 16, and the adjustment screw 16 takes only the compressive force and does not receive the bending load, so the adjustment screw does not become unstable in terms of strength depending on the degree of adjustment, unlike the conventional structure.

Furthermore, since the chain wheel 1 is attached to the slider 10 which slides while being guided by the groove 13 of the guide 11 and the protrusion 14 of the slider 10, the chain wheel 1 is attached to the nut 17 during tension adjustment work.
Even if the chain 2 and the chain wheel 1 are loosened and the adjustment screw 16 is turned, the parallelism between the chain 2 and the chain wheel 1 will not be deviated (tension adjustment work becomes extremely easy).

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the structure of the tension adjusting chain wheel device of the present invention, Fig. 2 is a front view showing the structure of the tension adjusting chain wheel device of the present invention, and Fig. 3 is a plan view showing the structure of the tension adjusting chain wheel device of the present invention. 4 is a side view showing the structure of the chain wheel device, FIG. 4 is a layout diagram showing an example of use of the chain wheel device for tension adjustment, FIG. 5 is a plan view showing the structure of a conventional example of the chain wheel device for tension adjustment, and FIG. The figure is a front view showing the structure of a conventional example of a chain wheel device for tension adjustment. ■...Chain wheel, 2...Chain, 5...Mounting plate, 6
...Axis, 10...Slider, 11...Guide, 1
3...Groove of guide 11, 14...Protrusion of slider 10, 15...Screw hole, 16...Adjustment Fig. 3

Claims (1)

[Claims] 1) In a device for passing a chain between a driving side chain wheel and a driven side chain wheel to transmit power from the driving side chain wheel to the driven side chain wheel, a guide having a rectangular guide hole and this guide hole are used. A slider that fits into the guide hole without any gaps and can slide in the longitudinal direction of the rectangular guide hole, a fixing means for fixing the slider to the guide at a desired position, and a chain wheel rotatably attached to the slider, A chain wheel device for adjusting tension of a chain, characterized in that the guide is fixed in a state where the chain wheel and the chain are engaged with each other.