JPS6045955B2 - oscillator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oscillator that is attached to a vibrating body of a vibrating machine to impart desired vibrations, and is particularly intended to improve the durability of a bearing that rotatably supports an eccentric heavy weight.

Conventionally, in a vibrating machine, as shown in Figs. 1 and 2, a vibrating body 1 is elastically supported by buffer springs A and A', and is fixed to a rotating shaft supported at both ends by bearings 2. The eccentric weight 6 vibrates due to the centrifugal force generated by its rotation, and the axis of the rotating shaft 5 also vibrates accordingly.

To transmit power to the vibrating rotating shaft 5, for example, the rotation of the stationary electric motor M is transmitted to the intermediate shaft 7 via a power transmission mechanism C such as belt pulleys B, B' and a belt. intermediate shaft 7
The other end is connected to the rotating shaft 5 via a flexible joint 8, so that power from the intermediate shaft is transmitted to the rotating shaft 5.
In the oscillator in such a vibrating machine, the eccentric weight 6
The rotating shaft 5, which is fixed with A load is applied to the inner ring, and the inner ring is used under harsher conditions than the outer ring, which adversely affects the bearing 2 and shortens its life.

That is, as shown in FIG. 3, when the rotating shaft 5 rotates, a load W is generated in the direction of the eccentric weight, and this direction moves with the rotation of the rotating shaft 5, so the outer ring 4 of the bearing 2 is completely This rotational load will be applied all around the circumference.

On the other hand, the inner ring 3 is concentrated in the direction of the eccentric heavy weight, and
This creates harsh conditions for bearings due to the high Hertzian stress. Furthermore, in the case of the conventional system, as shown in FIG. 4, the shaft is deflected and tilted at the bearing support portion, causing a reduction in the life of the bearing.

For this reason, it is necessary to make the shaft diameter excessively thick, or to install an eccentric weight between the bearing support parts of the shaft, so as to offset the bending tendency of the shaft due to the load based on this eccentric weight and the deflection inclination of the shaft. It used complicated methods and was economically disadvantageous. Furthermore, depending on the size of the vibrating body, the length of the shaft becomes long, which causes many inconveniences in terms of accuracy as a machined product, parts management, assembly work, etc.

The object of the present invention is to provide an oscillator that can advantageously solve the above-mentioned problems. Next, the present invention will be explained in detail using illustrated examples. In FIG. 5, reference numeral 11 denotes a vibrating body of a vibrating machine, which is elastically supported by a buffer spring (not shown). A hollow fixed shaft 1 is provided on the outside of the vibration body 11.
The flange portion provided at the base end of the hollow fixed shaft 10 is firmly connected, the inner ring of the bearing 12 is attached to the outside of the hollow fixed shaft 10, and the eccentric weight 16 is fitted into the outer ring 14 of the bearing 12. is rotatably supported, and its eccentric weight 1
6 is integrally provided with a bearing cover 19. The bearing cover 19 is fixed to the power transmission shaft 15 that passes through the hollow fixed shaft 10, and the intermediate rotating shaft 17 that transmits power from a power source (not shown) through a power transmission mechanism is a flexible joint 18. It is connected to the power transmission shaft 15 via.

Thus, due to the rotation of the power transmission shaft 15, the bearing cover 1
The eccentric weight 16 rotates together with the outer ring 14 of the bearing 12 via the eccentric weight 16, and the vibration main body 11 vibrates due to the centrifugal force generated by the rotation of the eccentric weight 16.

Since the oscillator of this embodiment is constructed as described above, when the outer ring 14 of the bearing 12 rotates as shown in FIG. Because of the movement, the inner ring 13 receives this rotational load over its entire circumference, so the stress in the inner ring, which has a high Hertzian stress, is dispersed.

On the other hand, the outer ring 14, which has a low Hertzian stress, is locally subjected to the load W, and the life of the bearing can be extended. Furthermore, since the flange portion at the base end of the hollow fixed shaft 10 can be freely selected to be large, the deflection and inclination of the shaft can be reduced, thereby reducing the adverse effects on the bearing.

Furthermore, the effect on the hollow fixed shaft 10 and bearings when handling high-temperature raw materials is extremely small, and no special heat protection treatment, such as water cooling, is required. In the case of another embodiment shown in FIG. 7, two oscillators similar to those of the previous embodiment are applied in combination on both the inner and outer sides of the vibrating body 11.

In this case, it is easily possible to make each hollow fixed shaft into an integral structure. According to this invention, the flange at the proximal end of the hollow fixed shaft 10 is fixed to the vibrating body 11, and the hollow fixed shaft 10
The inner ring of the bearing 12 is attached to the outer ring of the bearing 12, and a bearing cover 13 is provided integrally with the eccentric weight 16 which is fitted to the outer ring of the bearing 12 and is rotatably supported. Since the power transmission shaft 15 is connected to the
The stress in the inner ring 13, which has a high Hertzian stress, is dispersed, and the outer ring 14, which has a low Hertzian stress, is locally loaded by the eccentric weight, which makes it possible to extend the life of the bearing. Since the flange part can be made wider, the deflection and inclination of the shaft can be reduced, and the structure of the entire oscillator is simple, and a thin power transmission shaft 15 can be used. Since a large number of units can be manufactured and stored for each weight, advantages such as convenient storage and handling can be obtained.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional side view of a conventional vibration machine, Figure 2 is an external view showing a typical example of a vibrating machine, Figures a and b are front and side views, respectively, and Figure 3 is the load effect of the bearing in Figure 1. 4 is an explanatory diagram of the deflection of the bearing shown in FIG. 1, FIG. 5 is a longitudinal cross-sectional diagram showing an embodiment of the present invention, and FIG. FIG. 7 is a longitudinal sectional side view showing another embodiment of the present invention. 10... Hollow fixed shaft, 11... Vibrating body, 12...
・Bearing, 13... Inner ring of bearing, 14... Outer ring of bearing, 15... Power transmission shaft, 16... Eccentric weight, 17.
...Intermediate rotating shaft, 18...Flexible joint, 19...Bearing cover.

Claims (1)

[Claims] 1. A flange at the base end of a hollow fixed shaft 10 is fixed to the vibrating body 11, an inner ring 13 of a bearing 12 is attached to the hollow fixed shaft 10, and an eccentric weight that is fitted to the outer ring of the bearing 12 and supported for free rotation. A bearing cover 13 is provided integrally with the weight 16, and the bearing cover 13 and the power transmission shaft 15 passing through the hollow fixed shaft 10 are coupled, and vibration oscillation force is generated by rotation of the power transmission shaft 15. An oscillator characterized by being configured as follows.