JPH0311455Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a sliding bearing.

[Conventional technology]

A conventional plain bearing is shown in FIGS. 8 and 9, in which a bush 8 having a plurality of semicircular grooves 9 is fitted inside a housing 1. The bush 8 is made of a soft material such as rubber or resin, or a hard metal material.

[Problem that the invention attempts to solve]

As mentioned above, conventional sliding bearings have a problem in that when the bush 8 is made of a soft material such as rubber or resin, seizure may occur and dry operation cannot be performed. Further, the conventional sliding bearing has the problem that when the bushing 8 is made of a hard metal material, it becomes expensive to process.

[Means for solving problems]

The present invention aims to solve the problems of the conventional products, and as a means to solve the problem, a cylindrical shell is fitted inside the housing, and the inside of this cylindrical shell is A plurality of annularly arranged fitting grooves are formed at a plurality of positions in the axial direction on the circumferential surface, and between at least two of the plurality of axial positions, a fitting groove on one side and a fitting groove on the other side are formed. The fitting grooves are offset in the circumferential direction, an elastic material is fitted into the recessed part of the fitting groove inside the cylindrical shell, and a hard material that is in sliding contact with the main shaft is bonded to the inside of the elastic material. A gap is formed between the plate attached to the end portion, the cylindrical shell, the elastic material, and the hard material.

[Effect]

In sliding bearings, a hard material is in sliding contact with the main shaft, so seizing does not occur during dry operation, and even if uneven contact occurs with the main shaft, the elastic material absorbs the deformation due to uneven contact and provides a damping effect. Furthermore, even if the hard material expands thermally during dry operation, the deformation due to the thermal expansion will not exceed the distance of the gap formed between the plate and the hard material.

Moreover, since the positions of the hard material between at least two positions in the axial direction are shifted in the circumferential direction, the number of sliding points on the circumference between the hard material and the main shaft increases.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

1 and 2 show a first embodiment of the present invention. Inside a housing 1, there is a cylindrical shell 2 having a plurality of fitting grooves, for example, dovetail fitting grooves 2a. It is fitted. The plurality of fitting grooves 2a are arranged annularly at two positions in the axial direction on the inner peripheral surface of the cylindrical shell 2, respectively.
In addition, the fitting grooves 2a arranged annularly at one position in the axial direction and the fitting grooves 2a arranged annularly at the other position are arranged around the periphery as shown separately on the left and right sides in FIG. The orientation is incorrect. A trapezoidal elastic member 3 is fitted into the recess of the fitting groove 2a inside the cylindrical shell 2. The elastic material 3 is made of rubber or the like. A hard material 4 having a rectangular cross section is joined to the inside of the elastic material 3. The hard material 4 is made of ceramics or the like. The hard material 4 is in sliding contact with the main shaft 6.
A plate 5 is attached to the end of the housing 1, and a gap 7 is formed between the plate 5, the cylindrical shell 2, the elastic material 3, and the hard material 4.

With the above configuration, since the sliding part with the main shaft 6 is formed of the hard material 4 made of ceramics or the like, seizure will not occur even in dry operation, and the hard material 4 is replaced with an elastic material. 3, even if the main shaft 6 is tilted or bent, the elastic member 3 can prevent the main shaft 6 from hitting one side. Moreover, since each fitting groove 2a at each position in the axial direction is shifted in the circumferential direction,
The hard material 4 and the main shaft 6 can slide on the circumference without any gaps, and even if part of the hard material 4 cracks during dry operation and bearing performance deteriorates, the hard material 4 and the main shaft 6 can slide on the circumference without any gaps. Since the other hard material above covers this, there is an advantage that the bearing life is increased.

Further, as in the second embodiment shown in FIG. 3, a plurality of spherical hard materials 4 may be joined inside the elastic material 3. Components with the same reference numerals as in FIGS. 1 and 2 indicate the same or corresponding parts, and therefore the description thereof will be omitted.

When configured as in the second embodiment, since a plurality of spherical hard materials 4 are joined inside the elastic material 3,
As is well known, the structure has the advantage that the hard material 4 is not easily damaged by thermal stress or the like, and there is no damage caused by the bond between the elastic material 3 and the hard material 4 coming off.

As shown in Fig. 4, the hard material 4 is
It may be arranged at a plurality of the above positions (four positions in the illustrated example). In this case, the arrangement of the fitting grooves can be modified in various ways, and for example, configurations as shown in FIGS. 5a and 5b can be considered. That is, what is shown in FIG. 5a is the inner circumferential surface of the cylindrical shell 2, which has many fitting grooves 2a formed in the circumferential direction and the axial direction, and the fitting grooves in the axial direction are formed in the front and rear. It is formed to be located between the fitting grooves 2, 2. Also, what is shown in Figure 5b is
A large number of fitting grooves 2a are formed in the inner circumferential surface of the cylindrical shell 2 in the circumferential and axial directions, and the fitting grooves in the axial direction are slightly shifted from the previous fitting groove 2 in the circumferential direction. It is about forming. In addition,
It goes without saying that each of these fitting grooves 2a is provided with an elastic material and a hard material, as in the previous embodiment.

By the way, the fitting groove 2a shown in FIGS. 5a and 5b above
In order to carry out this, for example, as shown in FIG. A large number of fitting grooves 2a are formed on the inner circumferential surfaces of the second and third cylindrical shells 2'', 2 which are shorter in the direction, at the same intervals as the first cylindrical shell 2', and these are connected to the first cylindrical shell 2. ' and the second cylindrical shell 2'' and between the second cylindrical shell 2'' and the third cylindrical shell 2, the positions in the circumferential direction are shifted by the fitting pins 10. Once installed, it can be carried out easily.

Further, as a structure for attaching the elastic material and the hard material to the fitting groove 2a, as shown in FIG. 7, an elastic material 33 is attached to the bottom surface of the fitting groove 2a,
A thermally conductive material 20 having good thermal conductivity may be attached to the inner circumferential surface of the fitting groove 2a and the side surface of the fitting groove 2a, and the hard material 4 may be attached to the inner circumferential surface side of this thermally conductive material 20. In this way, the heat generated by the hard material 4 is efficiently conducted from the side surface of the fitting groove 2a to the cylindrical shell 2 by the thermal conductor 20, so overheating of the hard material 4 is prevented and the bearing life is extended. It has the advantage of increasing the

[Effect of idea]

As described above, in the present invention, since the elastic material is fitted into the recess of the fitting groove inside the cylindrical shell, the elastic material absorbs the deformation caused by the uneven contact of the main shaft, and has a vibration damping effect. There is. In addition, this invention has the inside of the elastic material.
Since a hard material is bonded to the main shaft in sliding contact, dry operation is possible, and there is an advantage that less machining is required and the cost is reduced. Furthermore, since the present invention forms a gap between the plate, the cylindrical shell, the elastic material, and the hard material, even if the hard material deforms due to thermal expansion, the deformation will not exceed the distance of the gap. This has the effect of preventing damage caused by thermal expansion.

In addition, by shifting the position of the hard material in the circumferential direction between at least two axial positions, the sliding contact area between the hard material and the main shaft can be made to be the entire or almost the entire circumference when viewed from the axial direction. , high bearing performance and long bearing life.

[Brief explanation of drawings]

Figures 1 and 2 show a first embodiment of the present invention, where Figure 1 is a longitudinal sectional view, the left half of Figure 2 is a sectional view taken along line A-A in Figure 1, and the right half is a sectional view taken along the line A-A in Figure 1. 1st
It is a sectional view taken along the line BB in the figure. FIG. 3 is a sectional view of a second embodiment of the present invention. FIG. 4 is a longitudinal sectional view showing a third embodiment of the present invention. Figure 5a,
b is a schematic development view showing other embodiments of the fitting groove according to the present invention; Figure 6 is Figure 5 a, b
FIG. 3 is an exploded perspective view showing an example of forming a fitting groove. FIG. 7 is an enlarged sectional view of a main part showing another modification of the present invention. Figures 8 and 9 show conventional plain bearings, with Figure 8 being a half-sectional view and Figure 9 being a half-sectional view.
The figure is a side view. 1...Housing, 2...Cylindrical shell, 2a
...Fitting groove, 3...Elastic material, 4...Hard material, 5...
...Plate, 6...Main shaft, 7...Gap.

Claims (1)

[Claims for Utility Model Registration] (1) A cylindrical shell is fitted inside the housing, and a plurality of annular fitting grooves are arranged at a plurality of positions in the axial direction on the inner peripheral surface of the cylindrical shell. between at least two of the plurality of axial positions, the fitting groove at one position and the fitting groove at the other position are shifted in the circumferential direction, and the fitting groove on the inner side of the cylindrical shell An elastic material is fitted into the recess, and a hard material that is in sliding contact with the main shaft is joined to the inside of the elastic material, and between the plate attached to the end of the housing, the cylindrical shell, the elastic material, and the hard material. A sliding bearing characterized by having a clearance formed therein. (2) The sliding bearing according to claim 1, wherein the hard material is spherical. (3) The sliding bearing according to claim 1 or 2, wherein the elastic material is made of rubber. (4) The sliding bearing according to claim 1, 2, or 3 of the utility model registration claim, wherein the hard material is made of ceramics.