JP2000230564A - Rotary shaft support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent the applying of an excessive bending load to a rotary shaft supported by three or more bearings by interposing an O-ring between a housing and an outer ring or between a rotary shaft and an inner ring in any bearing of the three or more bearings arranged along the rotary shaft. SOLUTION: An O-ring is interposed between end bearings 20, 21 and an intermediate bearing 22 for supporting a rotary shaft 13 and housings 14, 15, 16, for example, between an outer ring 20A of the end bearing 20 and the inner peripheral surface of the housing 14. The O-ring may also be interposed between the inner ring 20B of the end bearings 20, 21 and the outer peripheral surface of the rotary shaft 13. With this structure, even if any one of the housings 14, 15, 16 is displaced with respect to the axis of others, the O-ring is elastically deformed to absorb the displacement, so that the end bearings 20, 21 and the intermediate bearing 22 can be arranged along the same axis. Namely, bending load acting on the rotary shaft 13 due to the working accuracy can be surely prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating shaft supporting structure for supporting a rotating shaft on a housing via three or more bearings.

[0002]

2. Description of the Related Art As shown in FIG. 4, a transmission 30 used for an automobile, an industrial vehicle, an industrial machine or the like, for example, rotatably supports a rotating shaft 33 having a transmission gear 32 with respect to a case 31. Shaft bearings 40 and 41 arranged at both ends of the rotating shaft 33 and an intermediate bearing arranged at the center of the rotating shaft 33
It has 42. The end bearings 40 and 41 and the intermediate bearing 42
A housing having a concave cross section formed at a predetermined position of the case 31.
Press fit into 34, 35, 36 respectively. In such a transmission 30, in order for the rotating shaft 33 to rotate smoothly, the end bearings 40, 41 and the intermediate bearing 42 need to be arranged along the same axis, in other words, the housing Three
4, 35 and 36 need to be formed along the same axis.

[0003]

However, the case
31 is, for example, the housing 34 is
In some cases, there is an axis deviation from 5, 36. FIG.
In this case, a bending load corresponding to the displacement E between the axis D of the rotating shaft 33 and the axis C of the housing 34 acts on the end of the working rotating shaft 33 as shown in FIG. There is a problem that whirling, vibration, noise, and the like are caused, and the life of the end bearing 40 is shortened. The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a rotating shaft support structure capable of reliably preventing an excessive bending load from acting on a rotating shaft supported by three or more bearings. It is intended to be.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is directed to a three-dimensional motor which is arranged along a rotating shaft to rotatably support the rotating shaft with respect to a housing.
In the rotating shaft support structure including the bearing described above, an O-ring is interposed between one of the housing and the outer ring and one of the rotating shaft and the inner ring in any one of the bearings. And

Here, various rolling bearings such as ball bearings, roller bearings, and tapered roller bearings, which are not limited to single row and double row, can be used as the bearing. These bearings may be of different types, as long as they are arranged at arbitrary positions such as the end and the center along the rotation axis. Further, the O-ring may be formed of a resin having appropriate elasticity or the like, and the cross-sectional shape is arbitrary. The O-ring may be interposed only in one or both of the housing and the outer ring and between the rotating shaft and the inner ring, and may be applied to all bearings.

[0006] In the rotating shaft support structure configured as described above, even if any one of the housings is misaligned with respect to the other, the specific bearing deforms the O-ring to prevent the housing from moving. Since the eccentricity is possible, it is possible to prevent an excessive bending load acting on the rotating shaft as in the related art, thereby achieving the object described above.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the embodiments described below, the members and the like already described in FIGS. 3 and 4 are denoted by the same reference numerals in the drawings to simplify or omit the description.

[0010] In the transmission 10 of the embodiment shown in FIG. 1, the rotating shaft 13 is provided with a case via end bearings 20 and 21 and an intermediate bearing 22.
Supported by 11. As shown in FIGS. 2A and 2B, the transmission 10 includes an outer race 20A of an end bearing 20.
An O-ring 23 is interposed between the housing 11 and the inner peripheral surface of the housing 14 formed in the case 11. The O-ring 23 is made of rubber or resin having appropriate elasticity, and is fitted in a groove 20C formed on the outer peripheral surface of the outer ring 20A.

According to the above embodiment, the shaft end bearing
Since the O-ring 23 is interposed between the outer ring 20A of 20 and the inner peripheral surface of the housing 14, any one of the housings 14, 15, and 16 has an axial deviation with respect to the other. Also,
The end bearings 20, 21 and the intermediate bearing 22 can be arranged along the same axis by the elastic deformation of the O-ring 23 for absorption. That is, according to this embodiment, the bending load acting on the rotating shaft 13 can be reliably prevented due to the processing accuracy and the like, whereby the whirling of the rotating shaft 13 and the whirling of the rotating shaft 13 are caused. Vibration and noise can be suppressed.
As shown in FIG. 2C, the O-ring 23 may be fitted in a groove 20D provided on the inner peripheral surface of the housing 14.

In addition, the present invention is not limited to the embodiment in which the O-ring 23 is interposed between the outer ring of the shaft end bearing and the inner peripheral surface of the housing. As shown in FIG. This also includes a mode in which the rotary shaft is interposed between the rotary shaft and the outer peripheral surface. That is, the O-ring 23 shown in FIG. 3A is fitted into the groove 20E provided in the outer ring 20B of the shaft end bearing 20, and
The O-ring 23 shown in FIG. 3B is fitted in a groove 20F provided on the outer peripheral surface of the rotating shaft 13. Desired effects can be obtained also by these modes. In addition, the materials, shapes, dimensions, forms, numbers, arrangement locations, and the like of the housing, the rotating shaft, the bearing, the outer ring, the inner ring, the O-ring, and the like exemplified in the above-described embodiment are arbitrary as long as the present invention can be achieved. Yes,
Not limited.

[0011]

As described above, according to the present invention, the O-ring interposed between the housing and the outer ring and between the rotating shaft and the inner ring is deformed, so that the O-ring is formed on the rotating shaft. Excessive bending load that acts can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a transmission according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of the transmission shown in FIG.

FIG. 3 is an enlarged sectional view showing a modification of the present invention.

FIG. 4 is a sectional view showing a conventional transmission.

FIG. 5 is an enlarged sectional view showing a main part of the transmission shown in FIG. 4;

[Explanation of symbols]

 10 Transmission 11 Case 13 Rotary shaft 14, 15, 16 Housing 20, 21 Shaft end bearing 22 Intermediate bearing 23 O-ring 20A Outer ring 20B Inner ring

Claims (1)

[Claims] 1. A rotating shaft supporting structure comprising three or more bearings arranged along the rotating shaft to rotatably support the rotating shaft with respect to a housing, wherein the rotating shaft support structure includes: An O-ring support structure, wherein an O-ring is interposed between one of the housing and the outer ring and between the rotating shaft and the inner ring.