JPS63318306A - Mounting structure to shaft of brittle material sleeve for bearing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rotating side sleeve used in a sliding bearing for cedar bark in a rotating machine such as a four-wheel drive machine, and in particular, it is made of brittle materials such as ceramics and cemented carbide. This invention relates to a structure for fixing a cylindrical sleeve to a shaft.

[Conventional technology]

Conventionally, ceramics and cemented carbide have been used in combination with sliding bearings for various purposes because of their excellent sliding properties and good wear resistance due to their high hardness.

5 to 7 are main part sectional views showing a conventional example of a mounting structure of a brittle material sleeve for a bearing to a shaft, and FIG.
In the figure, the sleeve 2 fitted so as to come into contact with the stepped portion 1a of the rotating shaft 1 is inserted into the rotating shaft IK by screwing the set screw 8 through the pre-drilled hollow hole 2a. is fixed.

In FIG. 6, the sleeve 2 fitted so as to come into contact with the stepped portion 1aVc of the rotating shaft l has a concave notch groove 2C on the end surface 2b on the opposite side of the contact portion with the stepped portion 1a, A fixing ring 7 having a convex portion 7a into which the concave notch groove 2eK is fitted is attached to the sleeve f.
The convex part 7a of the ring 7 is fitted into the concave notch groove 2C of the ring 7 and pressed against the end surface 2b of the sleeve 2,
It is fixed in that position by a set screw 8, thereby fixing the sleeve 2 in rotation @l.

In FIG. 7, the sleeve 2 fitted so as to come into contact with the stepped portion 1a of the shaft I is fixed to the rotating shaft I with an adhesive 9. As shown in FIG.

[Problem that the invention seeks to solve]

In the above-mentioned conventional structure for fixing the sleeve to the shaft,
There were the following problems (defects).

That is, in the case of the one shown in Figure 5, three! 2, it is necessary to drill a hole 2a for the set screw 8. However, brittle materials are inherently weak against impacts, and the stress concentration that occurs in the hole 2a causes three! There was a problem in that the strength, impact resistance, and impact resistance of 2 were greatly reduced.

In addition, in the case shown in FIG.
Since the fixation is performed by fitting with the concave notch groove 2C formed on the end surface of the sleeve 2, similar to the fifth factor, stress concentration occurring in the concave notch groove 2C of the sleeve 2 However, there was a problem in that the strength and impact resistance of the sleeve were significantly reduced.

Furthermore, in the case shown in FIG. 7, since the sleeve 2 is fixed to the rotating shaft l by an adhesive 9, there are problems such as the hassle of replacing the sleeve and the concern that the adhesive strength will decrease due to temperature changes. was there.

The technical object of the present invention is to provide a structure for fixing a rotation-side sleeve to a shaft, which is made of a brittle material and does not have a shape that causes stress concentration, such as a keyway, hole, or notch.

[Means for solving problems]

In order to solve the problems and technical problems of the prior art described above, the present invention has been made to improve the inner or outer peripheral surface of a brittle material cylindrical sleeve used on the shaft side of a sliding bearing for a rotating machine. A flat part is provided in a part of the sleeve, and the rotation of the sleeve and the shaft is stopped by a key that is in close contact with the flat part and a shaft or a ring fixed to the shaft, which is the shaft side part facing through the key. This is characterized in that the brittle material sleeve is free from shapes that cause stress concentration, such as keyways, holes, and notches.

[For production]

Since the present invention is configured as described above, when the shaft rotates during operation, the sleeve receives a force in a direction opposite to the direction of rotation due to frictional force with the bearing. Accordingly, the flat part of the circumferential surface of the sleeve also tends to rotate in the direction of the force.

Then, one surface is brought into close contact with the flat part, and the other surface is tightly fitted into the curved surface of the shaft side part, that is, into the keyway of the outer peripheral surface of the shaft or the inner peripheral surface of the ring fixed to the shaft, and receives a force in the rotational direction. There are keys and three above! This means that the contact position with the plane part shifts (displaces). In other words, as mentioned above, the flat part of the sleeve rotates in the opposite direction to the above rotational direction with respect to one surface on the opposite side of the key whose other surface is fixed in the circumferential direction with the other surface in close contact with the key groove on the shaft side. They move relative to each other and try to come into contact with each other in an oblique direction. Therefore, the key moves radially, for example, radially outward in a case where the flat part is provided on the outer circumferential surface (Fig. 1), and radially inward in a case in which the flat part is provided on the inner circumferential surface (Fig. 3). (displacement), a radial reaction force is applied to the sleeve, and the sleeve is pressed and fixed against the shaft by this force.

Generally, the friction coefficient of a combination bearing made of ceramics or superhard materials is small, so the value of the above-mentioned force (reaction force) is also small. In addition, the compressive strength of these brittle materials is considerably higher than that of ordinary metals, so they can be safely fixed with almost no strength problems.

In addition, in addition to the flat part, the sleeve made of brittle material has
Since it does not have processed parts such as grooves, holes, and notches, stress concentration does not occur and strength does not decrease.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show a first embodiment of the present invention in which a flat part is provided on the outer peripheral surface of the sleeve, and FIG. 1 is 1-1 in FIG. 2.
A sectional view taken along the line, and FIG. 2 is a front sectional view of the main part.

In the figure, a sleeve 12 made of a brittle material attached to the outer circumferential side of the rotating shaft l has a flat part 12a at a distance T from the center over the entire length a.
Two pieces are provided at an interval of 90°. Also, a fixing ring 17 fixed to the rotating shaft l with a set screw 8
In Fig. 1, 3 is the bearing sliding member, 4 is the metal scrap case, 5 is the bearing support, and 5a is the same. It is an arm.

To explain the busy action, when the rotation axis l rotates,
Due to the frictional force with the bearing sliding member 3, the sleeve 12 receives a load (force) in the direction opposite to the direction of rotation, and the flat portion 12& also tends to rotate in the direction of the load (force). Accordingly, the flat portion 12a is firmly fixed to the rotating shaft l and receives force in the rotational direction, and the key 16 is tightly fitted into a key groove on the inner peripheral surface of the ring 17. Then, the key 16 moves relatively in the opposite direction, and the flat part abuts the key obliquely, attempting to move the key 16 outward in the radial direction, and receiving a reaction force F from the fixing ring 17. Due to this reaction force F, the sleeve 12 is pressed against the rotating shaft IK by the force F and is fixed.

Generally, the coefficient of friction of a combination bearing made of ceramics or carbide material is small, so the value of the force F is also small. Furthermore, since the compressive strength of these brittle materials is considerably higher than that of ordinary metals, they can be safely fixed with almost no strength problems.

3 and 4 show the 8g2 embodiment of the present invention.
The figure is a sectional view taken along the line Iff-III in FIG. 4, and FIG. The same reference numerals as those shown in Figures 1 and 2 indicate the same or similar parts.

In this embodiment, the key 26 is installed on the outer peripheral side of the rotating shaft 1 in Figure 1, in which the key 26 is installed on the inner peripheral surface of the sleeve 22. 1a, and the other end (the left end in the figure) is in contact with a fixing ring 27 fixed to the rotating shaft 1 with a central screw 8.

On the inner surface of the end portion of the sleeve 22 that contacts the stepped portion 1a of the rotating shaft 1, two flat portions 22a are provided at an interval of 90° over the entire length in the longitudinal direction (axial direction) a. Further, a key groove 1b is formed on the circumferential surface of the rotating shaft 10 so that a key 26 that closely contacts the flat surface 22aK of the sleeve 22 can be attached thereto.

According to this embodiment, when the rotating shaft l rotates during operation,
Similar to the first embodiment (FIGS. 1 and 2), the sleeve 22
is subjected to chipping in the direction opposite to the rotating direction due to the frictional force with the bearing sliding member 3. Therefore, on both sides of the key 26, the shaft 1 and the sleeve 22 tend to be displaced by forces in relatively opposite directions, and the flat part 22a of the sleeve 22 is tilted at an angle.
? -26 and generates a radial force F, and this force F causes the sleeve f2 to come into contact with the shaft 11 member 3.
2 is pressed and fixed to the rotating shaft 1.

In addition, in the above-mentioned embodiment, a structure was described in which two keys 16 and 26 were installed at an angular interval of 1 square direction, but the number and direction of the keys can be installed in any position. .

〔Effect of the invention〕

As explained above, according to the present invention, in a sliding bearing in which a brittle material such as ceramics or cemented carbide is used as the rotation side sleeve, a flat part is provided on a part of the curved surface of the cylindrical sleeve, and the flat part is The sleeve 17- is made of a brittle material by running the key in close contact with the opposing shaft side portion via the key so as to prevent the sleeve and shaft from rotating. K=? It is possible to securely fix the product without performing any processing that would reduce the strength of the IJ hole or notch.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a sectional view taken along the line 1-1 in FIG. 2, FIG. 2 is a front sectional view of main parts, and FIGS. The figure shows a second embodiment of the invention, and a third embodiment of the invention.
The figures are a sectional view taken along the line III--III in FIG. 4, a front sectional view of the main part, and FIGS. 5 to 7 are front sectional views of the main part showing a conventional example. l...rotation axis, 3.・・Bearing sliding member, 8・・
・Seven Piss% 12.22...Sleep, 1
2a. 221L...Plane part, 16.26...Key 11
7゜27...Fixing ring. Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. A flat part is provided on a part of the peripheral surface of a cylindrical sleeve of a brittle material used on the shaft side of a sliding bearing for a rotating machine, and a key that closely contacts the flat part and a A brittle material sleeve for a bearing, characterized in that the sleeve and the shaft are prevented from rotating by opposing shaft side parts, and the brittle material sleeve does not have a shape that causes stress concentration. Mounting structure. 2. The flat part is provided on the outer peripheral surface of the sleeve,
2. The structure for attaching a brittle material sleeve for a bearing to a shaft according to claim 1, wherein the shaft side portions facing each other via the key are fixing rings fixed to the shaft. 3. The flat part is provided on the inner peripheral surface of the sleeve,
2. The structure for attaching a brittle material sleeve for a bearing to a shaft according to claim 1, wherein the shaft side portions facing each other via the key are shafts.