JPH0481043B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rolling bearing with a spacer suitable for cases where the linear expansion coefficients of the bearing ring of the rolling bearing and the mating member to which it fits are different.

[Conventional technology]

For mounting bearings on mating parts with different coefficients of linear expansion as mentioned above, please contact LUBRICATON.
In the article on pages 407 to 415 of the July 1981 issue of ENGINEERING, a rolling bearing with a spacer as shown in FIG. 4 is shown. In this bearing, the inner ring 10 was made of ceramic, and the spacer 50 was made of steel. The spacer 50 was in contact with the inner ring 10 at a tapered surface, and was a tight fit with the shaft 60. On the other hand, the inner ring 10 is a loose fit with respect to the shaft 60, so that even if the shaft 60 and the spacer 50 expand thermally, by selecting the above-mentioned clearance and the direction of the tapered surface.
The structure was designed to prevent excessive loads from being applied to the bearings.

[Problem that the invention seeks to solve]

When installing a bearing like the one described above on a shaft, it was necessary to be very careful to avoid eccentricity or inclination of the inner ring. Furthermore, thermal expansion or contraction of the bearing does not follow sudden changes in temperature, and excessive force may be generated within the bearing, resulting in damage. Furthermore, if a sudden temperature change occurs during bearing operation, the difference in the coefficient of linear expansion between the bearing ring and the mating member will cause an unbalance as the fitting gap decreases, causing the bearing ring to tilt relative to the mating member. There was a tendency for things to go wrong.

[Means for solving problems]

This invention relates to a rolling bearing with a spacer in which the linear expansion coefficients of the rolling bearing ring and the mating member are different, in which the bearing ring is a clearance fit to the mating member, and both planes of the bearing ring are outwardly opened. The tapered surfaces of a pair of intermediate spacers each having a convex spherical surface are engaged with these tapered surfaces, and the intermediate spacers and the mating member are also a clearance fit. A pair of tightening spacers having mating concave spherical surfaces have a linear expansion coefficient substantially equal to that of the mating member and are attached to the mating member with a tight fit, and the spherical centers of the convex spherical surface and the concave spherical surface are Both are rolling bearings with a spacer mounted so that they approximately coincide with the center of the bearing.

[Effect]

In this invention, since the spherical surfaces of the intermediate spacer and the tightening spacer are composed of spherical surfaces whose spherical center is the center of the rolling bearing, even if the bearing ring is tilted, it can be corrected by the self-aligning action. This makes it possible to operate while adapting to sudden temperature changes.

〔Example〕

Next, a first embodiment of the present invention will be described with reference to FIG. This embodiment relates to a rolling bearing with a spacer when the linear expansion coefficients of the inner ring of the rolling bearing and the mating member shaft are different. 1 is the inner ring of a cylindrical roller bearing, and both flat surfaces 1
1 is a tapered surface that opens outward with respect to the bearing center O. 2 is the outer ring of the cylindrical roller bearing;
A plurality of rollers 3 are held at equal intervals between the inner ring 1 and the inner ring 1 by a cage 4. Said inner ring 1
A pair of intermediate spacers 5 each have a tapered surface 51 corresponding to the tapered surface 11 of the pair of intermediate spacers 5. One surface of the intermediate spacer 5 has a convex spherical surface 52, and the spherical center of this convex spherical surface 52 substantially coincides with the bearing center O. A concave spherical surface 6 corresponding to the convex spherical surface 52
The pair of tightening spacers 6 having the number 1 are made of a material having substantially the same coefficient of linear expansion as the shaft 7, and are tightly fitted to the shaft 7. The inner ring 1 and the intermediate spacer 5 are both in a clearance fit with the shaft 7 when the bearing is installed, and in the cylindrical roller bearing, the inner ring is connected via the intermediate spacer 5 to the tightening spacer 6. It is being pinched.

The second embodiment shown below relates to a rolling bearing with a spacer suitable for cases where the linear expansion coefficients of the outer ring of the rolling bearing and the mating member, which is the axle box, are different. , 2A is an outer ring of a radial ball bearing, and the outer diameter surface is loosely fitted to the axle box 100, and the plane of the outer ring 2A is a tapered surface 21A that opens outward with respect to the bearing center O. ing. A pair of intermediate spacers 8 each have a tapered surface 81 corresponding to the tapered surface 21A of the outer ring 2A. One surface of the intermediate spacer 8 has a convex spherical surface 82, and the spherical center of this convex spherical surface 82 substantially coincides with the bearing center O. There is. A pair of tightening spacers 9 having a concave spherical surface 91 corresponding to the convex spherical surface 82 have substantially the same coefficient of linear expansion as the axle box 100;
It is tightly fitted to the axle box 100.

The above intermediate spacer 8 is connected to the axle box 10 in the same way as the outer ring 2A.
0, it is a clearance fit, and the radial ball bearing has an outer ring 2A sandwiched between a tightening spacer 9 via an intermediate spacer 8.

The third embodiment shown below relates to a rolling bearing with a spacer in which the inner ring and outer ring of the rolling bearing have different coefficients of linear expansion from the shaft and the axle box, respectively, and 1A is the inner ring of a cylindrical roller bearing. in,
This inner ring 1A is held between a tightening spacer 6A via an intermediate spacer 5A, as in the first embodiment,
It has a clearance fit with the shaft 7A, and the tightening spacer 6A
is tightened and fixed by a nut 200. Further, the intermediate spacer 5A and the shaft 7A are fitted with a clearance.

On the other hand, the outer ring 20A of the rolling bearing is connected to the tightening spacer 9 via the intermediate spacer 8A, substantially similar to the second embodiment.
A and the axle box 100A form a clearance fit, and the tightening spacer 9A is tightened and fixed by a nut 300. In this embodiment as well, the contact surface between the intermediate spacer and the tightening spacer is spherical,
The spherical center of each spherical surface is configured to substantially coincide with the center of the rolling bearing. The tightening spacer, the nut, and the mating members, such as the shaft and the axle box, are made of materials having approximately the same coefficient of linear expansion.

Three examples of rolling bearings with spacers have been described above, but the mounting technology using the intermediate spacer and tightening spacer described above is suitable for mounting a mating member such as a shaft and a gear or cam that fits into the shaft. It can also be applied to installations where the coefficients of linear expansion are different.

〔Effect of the invention〕

Since the rolling bearing with a spacer of the present invention is constructed as described above, the tightening spacer and the mating member have approximately the same coefficient of linear expansion even during operation at a temperature different from when the bearing is mounted. , interference is ensured, and problems such as creep do not occur.

In addition, in conventional rolling bearings with a spacer, if a sudden temperature change occurs during operation, an imbalance occurs when the fitting clearance between the raceway ring and the mating member decreases due to the difference in linear expansion coefficients between the raceway ring and the mating member. The ring tends to tilt with respect to the mating member, but in this invention, the spherical surfaces of the intermediate spacer and the tightening spacer are made of spherical surfaces whose center is the center of the rolling bearing. Therefore, even if the bearing ring is tilted, it is corrected by the self-aligning action, and it is possible to operate the bearing ring while adapting to sudden temperature changes.

Furthermore, if the linear expansion coefficient of the intermediate spacer is made approximately equal to that of the mating member, an appropriate gap between the mating member and the mating member can be maintained during operation as well as during installation, making the self-aligning action even more effective. can. On the other hand, if a material with a very large coefficient of linear expansion is selected, installation becomes easy and a predetermined clearance can be secured during operation.

[Brief explanation of the drawing]

Figures 1 to 3 are sectional views of essential parts showing embodiments of the present invention, respectively. Figure 1 shows an embodiment in which the linear expansion coefficients of the inner ring and the shaft are different, and Figure 2 shows the outer ring and the shaft. An example is shown in which the coefficient of linear expansion is different from that of the axle box, and FIG. 3 shows an example where the inner ring and outer ring have different coefficients of linear expansion from the mating shaft and axle box. FIG. 4 is a sectional view of a main part of a conventional rolling bearing with a spacer. Explanation of symbols: O is the center of the bearing, 1, 1A is the inner ring,
2, 2A, 20A are outer rings, 5, 8, 5A, 8A are intermediate spacers, 6, 9, 6A, 9A are tightening spacers, 7,
7A is the shaft, 100 and 100A are the shaft boxes.

Claims (1)

[Claims] 1. In a rolling bearing with a spacer in which the rolling bearing and the mating member have different linear expansion coefficients, the bearing ring of the mating rolling bearing is a clearance fit with respect to the mating member, and both planes of the bearing ring are aligned with the shaft. A pair of intermediate spacers each having a tapered surface opening outward with respect to the center is engaged with the tapered surface of a pair of intermediate spacers each having a convex spherical surface on one side, and the intermediate spacer and the mating member are also a clearance fit. A pair of tightening spacers each having a concave spherical surface that engages with the spherical surface of the intermediate spacer has a coefficient of linear expansion substantially equal to that of the mating member, and is attached to the mating member with a tight fit and has the convex spherical surface. and a rolling bearing with a spacer installed so that the center of the concave spherical surface approximately coincides with the center of the bearing.