JPH0533773Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to the structure of a bearing portion of a rotating shaft.

[Prior art and its problems]

Conventionally, rotating shaft and bearing structures have been used in various fields. For example, FIG. 5 is a perspective view of a barrel 1 that is installed in an air outlet for an automobile to control the direction of wind blowing out. On the side of the barrel 1, a barrel shaft 3 is integrally attached to the resin barrel 1. By fitting this barrel shaft 3 into a bearing part (not shown) provided at the air outlet, it is possible to rotate the barrel 1 in the vertical direction, thereby controlling the upward and downward blowing direction of the air. can do. In addition, a resin blade 2 is provided inside the barrel 1 so as to be rotatable around an axis perpendicular to the barrel axis 3, and by rotating this blade 2 left and right, the left and right direction of the wind can be adjusted. The blowing direction can be controlled.

As a structure of such a rotating shaft and bearing made of resin, there is one in which a shaft having a circular cross section is fitted into a bearing hole having approximately the same diameter.

However, with this type of structure, if the diameter of the bearing hole is larger than the diameter of the shaft, looseness will occur, making it impossible to obtain an appropriate rotational operating load, and dust and debris may accumulate between the rotational shaft and the bearing hole. There was a possibility that the material could get in and adversely affect rotational operation. On the other hand, if the diameter of the shaft is larger than the diameter of the bearing hole, the rotating operation load can be obtained, but there is a problem that assembly becomes difficult, so it is necessary to mass produce shafts and bearings that do not cause these problems in terms of molding accuracy. That was extremely difficult.

[Means for solving problems]

In order to solve the above problems, in the rotating shaft and bearing of the present invention, one has a substantially oval cross section and the other has a circular cross section, and the rotating shaft of the bearing is fitted into a bearing hole. By being elastically deformed in the installed state, it comes into contact with the entire circumference of the rotating shaft.

〔effect〕

According to the rotating shaft support structure of the present invention having the above configuration, since the bearing is elastically deformed and tightly adheres to the entire circumference of the rotating shaft, there is no play in the rotating shaft. Since dust and debris do not enter between the rotation shaft and the bearing hole, an appropriate rotation operation load can be obtained. Furthermore, one of the rotating shaft and the bearing hole is approximately oval in cross section and the other is circular in cross section, and the entire circumference of the bearing hole is pushed uniformly and fitted as in the case where both are circular with approximately the same diameter. There is no need to push it in; all you have to do is spread it out locally and fit it in, making assembly easy.

〔Example〕

Next, embodiments of the present invention will be described in detail using the drawings.

FIG. 1 is an exploded perspective view of a rotating shaft 30, a bearing 40, and a bearing support 50 of the present invention. As can be seen from this figure, in this embodiment, the rotation shaft 30 is fitted into the bearing hole 42 of the elastically deformable bearing 40,
The bearing 40 is fitted into the bearing support hole 80 of the bearing support 50, but the bearing 40 has a square shaped part 70 around the bearing hole 42, and the bearing support hole 8
0 has the same shape as the bearing 40, so the bearing 40 is unrotatably supported by the bearing support 50, and therefore the rotation shaft 30 is rotatable with respect to the bearing 40 and the bearing support 50. can be assembled into.

Here, the bearing 40 may be elastically deformable, but it is preferable to use one that does not generate sliding noise when the rotating shaft 30 is rotated, can handle a certain amount of rotational operation load, and has good heat insulation properties. is preferable, and for example, pelprene (polyester elastomer) or the like can be used. The characteristics of this example are as follows:
As shown in FIG. 2, the rotation shaft 30 is provided with a flat portion 60 along the axial direction on its side surface, so that the cross section is approximately oval (FIG. 2a), and the bearing hole 42
has a substantially circular cross section (Fig. 2b).

Further, the diameter L3 of the bearing hole 42 is shorter than the longer diameter L1 of the rotating shaft 30 and longer than the shorter diameter L2 of the rotating shaft 30.

With the above configuration, the rotation shaft can be easily assembled into the bearing hole, and a stable rotation operation load can be obtained.

In this embodiment, the rotating shaft 30 is provided with a flat surface 60 along the axial direction on its side surface, and the bearing hole 42 has a substantially circular cross section, but the present invention is not limited to this in any way. There isn't. For example, the rotation axis may have an elliptical cross-section as shown in FIG. 3, or an oval cross-section as shown in FIG. In these cases, the major axes L1', L1'' of the rotary shafts 32, 34 are longer than the diameter of the bearing hole, and the minor axes L2', L2'' of the rotary shafts 32, 34 are longer than the diameter of the bearing hole. Short is preferable.

Further, contrary to the embodiments described above, the rotating shaft may have a substantially circular cross section and the bearing hole may have a substantially oval cross section. For example, although not shown, the rotating shaft and bearing of the embodiments described above may Even if the shape and size of the holes are completely reversed, the same effects as those described above can be obtained.

Furthermore, the rectangular portion 70 provided on the bearing 40 in FIGS.
The cross-section is square in order to prevent rotation relative to zero, and therefore any shape may be used as long as it can prevent rotation of the bearing relative to the bearing support. However, in order to apply a uniform load to the rotating shaft, it is desirable to form substantially the same thickness around the bearing hole.

Furthermore, although the barrel shaft and the blade shaft have been cited as examples of use of the rotating shaft support structure of the present invention, it goes without saying that the present invention is not limited thereto.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the rotating shaft and bearing according to the present invention, Fig. 2 a is a plan view of the rotating shaft shown in Fig. 1, and Fig. 2 b is a plan view of the bearing shown in Fig. 1. 3 and 4 are plan views respectively showing other embodiments of the rotating shaft of the present invention, and FIG. 5 is a barrel provided in an air outlet for an automobile as an example of the use of the rotating shaft. FIG. Rotating axis...30, 32, 34, 36, bearing...
40, Bearing hole...42.

Claims (1)

[Claims for Utility Model Registration] When a rotating shaft is fitted into an elastically deformable bearing having a bearing hole, the bearing is elastically deformed so as to come into contact with the entire circumference of the rotating shaft. A support structure for a rotating shaft, wherein one of the rotating shaft and the bearing hole has a substantially oval cross section, and the other has a circular cross section.