JP2001003932A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the occurrence of cracks in a rolling bearing by securely preventing the occurrence of early seizure and the heat cracks. SOLUTION: A side plate 10 or a guide ring 11 for slide-contact with an outer ring 1 and an inner ring 2 is made of bronze. Practically, the side plate 10 or the guide ring 11 for high-speed rotation is made of phosphor bronze (CAC5**), and the side plate 10 or the guide ring 11 for low-speed rotation is made of general bronze (CAC4**), and the side plate 10 or the guide ring 11 for very-high-speed rotation is made of aluminum bronze (CAC7**).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing in which a rolling element such as a cylindrical roller or a needle roller is rotatably interposed between an outer ring and an inner ring, and more specifically, to prevent early seizure and heat crack. In addition, the present invention relates to a rolling bearing capable of suppressing cracks and the like caused by the rolling bearing.

[0002]

2. Description of the Related Art Conventionally, for example, in a sheave bearing, FIG.
As shown in FIG. 3, a number of rollers 3 are interposed between the outer ring 1 and the inner ring 2 in a plurality of rows. A shield plate 5 is provided, and a flange 6 for guiding the outer ring 1 by slidingly contacting the rollers 3 is formed on the inner peripheral surface of the outer ring 1 between the plurality of rows of rollers 3. It is.

[0003] In a bearing for a chain conveyor, FIG.
As shown in the figure, a number of rollers 3 are interposed between the outer ring 1 and the inner ring 2, and the rollers 3 and the outer ring 1 are provided beside the rollers 3.
A shield plate 5 and a collar 7 are provided for slidingly contacting and guiding these members in the axial direction and for sealing the lubricant 4.

[0004] Further, although not particularly shown, a number of rolling elements are rotatably interposed between the outer ring and the inner ring, and the rolling elements slide beside either the outer ring or the inner ring beside these rolling elements. Side plates are provided for contacting and guiding them.

[0005]

In the above-mentioned rolling bearing, the shield plate 5, the collar ring 7 and the side plate which are in sliding contact with the outer ring 1 or the inner ring 2 are formed of the same material as the outer ring 1 and the inner ring 2. It is. In such a sliding contact surface, a combination of materials of the same type has a strong adhesive action, and is not preferable in terms of tribology.

Therefore, when the outer ring 1 and the inner ring 2 are made of quenched bearing steel, when the shield plate 5, the collar ring 7, and the side plate that come into sliding contact with the outer ring 1 and the inner ring 2 are made of an iron-based material that has a “likeness”. Before the rolling life is reached, premature burn-in or heat cracks may occur, which may cause problems such as cracks.

The present invention has been made in view of the above circumstances, and provides a rolling bearing that can prevent early seizure and heat cracks and can suppress cracks and the like caused by the seizure and heat cracks. Aim.

[0008]

In order to achieve the above object, a rolling bearing according to a first aspect of the present invention has a number of rolling elements interposed between an outer ring and an inner ring so as to freely roll. ,
In a rolling bearing in which side plates that are in sliding contact with an outer ring or an inner ring are arranged on the side of these rolling elements, the side plates are formed of bronze.

In a rolling bearing according to a second aspect of the present invention, a number of rolling elements are interposed between an outer ring and an inner ring so as to freely roll in a plurality of rows. In a rolling bearing provided with a guide wheel, the guide wheel is formed of bronze.

As described above, according to the present invention, since the side plate or the guide wheel which comes into sliding contact with the outer ring, the inner ring and the like is formed of bronze, the outer ring and the inner ring which are generally hardened bearing steels are used. In addition to being able to avoid being "together", such bronze has seizure resistance more than twice that of brass, has a high hardness, a small friction coefficient, and Hard materials such as quenched bearing steel have a small adhesive action on the sliding surface, so that early seizure and heat cracks can be prevented, and cracks and the like caused by this can be suppressed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rolling bearing according to an embodiment of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
It is a cross-sectional view of the rolling bearing for sheave according to the embodiment,
2 is an enlarged cross-sectional view of the caulking portion between the inner ring and the side plate shown in FIG. 1, FIG. 3 is a cross-sectional view and a side view of the side plate shown in FIG. 1, and FIG. It is the sectional view and side view of the side plate concerning the modification of form.

As shown in FIG. 1, in a sheave bearing, a number of rollers 3 are interposed between an outer ring 1 and an inner ring 2 in a plurality of rows. A side plate 10 fixed by caulking to the inner ring 2 is provided, and a guide wheel 11 is provided on the inner peripheral surface of the outer ring 1 between a plurality of rows of rollers 3.

When the rollers 3 are skewed and the outer ring 1 receives an axial force so as to separate (separate) from the inner ring 2, the side plate 10 comes into sliding contact with the outer ring 1 so that the outer ring 1 comes into sliding contact with the outer ring 1. 1 to prevent the outer ring 1 from separating (separating) from the inner ring 2, and at the normal time,
It also functions to position in the axial direction. However, the side plate 10
May be fixed to the outer ring 1 side. In this case,
This prevents the inner ring 2 from being separated (separated) from the outer ring 1 and also functions to position the inner ring 2 in the axial direction. When the side plate 10 is fixed to the outer ring 1 side, it may be fixed not only by caulking but also by press-fitting, shrink fitting, or the like.

A lubricant 4 is sealed inside the side plate 10, and a labyrinth structure is provided between the end of the side plate 10 and the outer ring 1, and the labyrinth is reduced to improve the sealing performance. Things.

When the side plate 10 is fixed to the inner ring 2 by caulking, as shown in FIG. 2, a step 2a is formed on the inner diameter side of the end of the inner ring 2, and this step 2a is (Arrow direction)
By caulking, the side plate 10 is caulked and fixed to the inner ring 2.

However, the side plate 1 is formed by such caulking.
In order to prevent 0 from tilting and riding on the outer raceway surface 2b of the inner race 2, the step end surface 2d between the outer raceway surface 2b and the fitting surface 2c of the side plate 10 has a taper angle. α (5 ° to 30 °).

In this embodiment, the side plate 10 is made of bronze. Specifically, the side plate 10 is formed of phosphor bronze (CAC5 **) for high-speed rotation,
For low-speed rotation, it is made of general bronze (CAC4 **), and for ultra-high-speed rotation, it is made of aluminum bronze (CAC7 **). With such a configuration, it is possible to prevent the outer ring 1 and the inner ring 2 which are generally quenched bearing steel from being "challenging" and to avoid such a metal containing bronze. The material has more than twice the seizure resistance compared to brass, high hardness, low coefficient of friction, and adhesion to hard materials such as quenched bearing steel on sliding surfaces. Is small, early burn-in and heat cracks can be prevented, and cracks and the like due to this can be suppressed.

As shown in FIG. 3, a radial groove 12 for storing lubricating oil may be formed on a sliding surface of the side plate 10 with respect to the outer ring 1. Thereby, seizure on the sliding surface can be prevented.

However, instead of the radial grooves 12, a circumferential groove 13 for storing lubricating oil may be formed as shown in FIG. Also in this case, seizure on the sliding surface can be prevented.

Further, the roughness of the sliding surface of the side plate 10 with respect to the outer ring 1 is preferably set to 1.6 μmRa or less according to JIS. In this case, seizure on the sliding surface can be further prevented.

Further, in the present embodiment, the guide wheels 11
Similarly, the side plate 10 is made of bronze. Specifically, the guide wheels 11 are formed of phosphor bronze (CAC5 **) for high-speed rotation, and are formed of general bronze (CAC4 **) for low-speed rotation. Aluminum bronze (CAC7 **) for rotation
It is formed from Therefore, it is possible to avoid being "churning" to the outer ring 1 and the inner ring 2, and since such a bronze has a small adhesive action on a sliding surface, it can prevent early seizure or heat crack. It can be reliably prevented.

By reducing the width of the guide wheel 11, the length of the roller 3 can be increased, and the load capacity of the bearing can be increased. Further, when a gap is provided between the guide wheel 11 and the outer wheel 1, the guide wheel 11
The roller 3 is simply guided in the axial direction, but by fixing the guide wheel 11 to the inner peripheral surface of the outer ring 1 by press fitting or the like, the outer ring 1 is guided in the axial direction by the guide wheel 11. May be configured.

(Second Embodiment) FIG. 5 shows a second embodiment of the present invention.
It is sectional drawing of the rolling bearing for chain conveyors concerning embodiment. In the bearing for a chain conveyor according to the present embodiment, a number of rollers 3 are interposed between the outer ring 1 and the inner ring 2, and these rollers 3 are guided sideways in the axial direction and lubricated. In order to seal the agent 4, the side plate 10 is
Is press-fitted and fixed.

Also in this embodiment, the side plate 10 is formed from bronze. Specifically, since it is the side plate 10 of the bearing for a chain conveyor, it is formed from general bronze (CAC4 **). Therefore, it is possible to avoid being "churning" to the outer ring 1 and the inner ring 2, and since such a bronze has a small adhesive action on a sliding surface, it can prevent early seizure or heat crack. This can prevent the occurrence of cracks and the like.

A radial groove (not shown) or a circumferential groove (not shown) for storing lubricating oil may be formed on the sliding surface of the side plate 10 with respect to the outer ring 1.
Further, the roughness of the sliding surface of the side plate 10 with respect to the outer ring 1 is J
It is preferable to be not more than 1.6 μmRa of the IS standard. As a result, seizure on the sliding surface can be further prevented.

The side plate 10 may be fixed to the outer ring 1 side, and may be fixed not only by press-fitting but also by caulking or shrink fitting.

(Third Embodiment) FIG. 6 shows a third embodiment of the present invention.
It is sectional drawing of the rolling bearing for roller followers which concerns on embodiment. In the rolling bearing for a roller follower according to the present embodiment, a retainer 14 is provided, and the side plate 10 is
Is press-fitted and fixed.

In this embodiment, the side plate 10 is made of bronze. Specifically, the side plate 10 is formed of phosphor bronze (CAC5 **) for high-speed rotation,
For low-speed rotation, it is made of general bronze (CAC4 **), and for ultra-high-speed rotation, it is made of aluminum bronze (CAC7 **). Therefore, it is possible to avoid being "churning" to the outer ring 1 and the inner ring 2, and since such a bronze has a small adhesive action on a sliding surface, it can prevent early seizure or heat crack. This can prevent the occurrence of cracks and the like.

A radial groove (not shown) or a circumferential groove (not shown) for storing lubricating oil may be formed on the sliding surface of the side plate 10 with respect to the outer ring 1.
Further, the roughness of the sliding surface of the side plate 10 with respect to the outer ring 1 is J
It is preferable to be not more than 1.6 μmRa of the IS standard. As a result, seizure on the sliding surface can be further prevented.

The side plate 10 may be fixed to the outer ring 1 side. The fixing method may be not only press-fitting but also caulking or shrink fitting.

The roller bearing for roller followers shown in FIG. 6 has the retainer 14, but the same effect can be obtained by using a full-roller roller bearing for roller followers without the retainer. Needless to say.

(Fourth Embodiment) FIG. 7 shows a fourth embodiment of the present invention.
It is sectional drawing of the rolling bearing for cam followers which concerns on embodiment. In the cam follower rolling bearing of the present embodiment,
The side plate 10a is press-fitted and fixed to the inner ring shaft 15, and the side plate 10b is press-fitted and fixed to the flange portion 16 of the inner ring shaft 15.

In the present embodiment, the side plate 10 is formed from a metal material containing at least bronze. In particular,
The side plate 10 is made of phosphor bronze (CAC5) for high-speed rotation.
**). For low-speed rotation, it is made of general bronze (CAC4 **). For ultra-high-speed rotation, it is made of aluminum bronze (CAC7 **). Therefore, it is possible to avoid being "churning" to the outer ring 1 and the inner ring 2, and since such a bronze has a small adhesive action on a sliding surface, it can prevent early seizure or heat crack. This can prevent the occurrence of cracks and the like.

A radial groove (not shown) or a circumferential groove (not shown) for storing lubricating oil may be formed on the sliding surface of the side plate 10 with respect to the outer ring 1.
Further, the roughness of the sliding surface of the side plate 10 with respect to the outer ring 1 is J
It is preferable to be not more than 1.6 μmRa of the IS standard. As a result, burning on the sliding surface can be further prevented.

The side plates 10a and 10b may be fixed to the outer ring 1 side, and may be fixed not only by press-fitting but also by caulking or shrink fitting.

The cam follower rolling bearing shown in FIG. 7 is a full-roller type cam follower rolling bearing without a retainer. However, the same effect can be obtained by using a cam follower rolling bearing with a retainer. It goes without saying that it plays.

The present invention is not limited to the above-described embodiment, but can be variously modified.

[0039]

As described above, according to the present invention,
Since at least the side plate or the guide ring that comes into sliding contact with the outer ring or the inner ring, etc. is formed of bronze, it is generally avoided that the outer ring or the inner ring, which is a quenched bearing steel, is "together". In addition to this, such bronze has a seizure resistance more than twice that of brass, has a high hardness, a small friction coefficient, and is suitable for hard materials such as hardened bearing steel. In addition, since the adhesive action on the sliding surface is small, early seizure and heat crack can be prevented, and cracks and the like due to this can be suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sheave rolling bearing according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a caulked portion between an inner ring and a side plate shown in FIG.

FIG. 3 is a sectional view and a side view of the side plate shown in FIG. 1;

FIG. 4 is a sectional view and a side view of a side plate according to a modification of the first embodiment.

FIG. 5 is a sectional view of a rolling bearing for a chain conveyor according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of a roller bearing for a roller follower according to a third embodiment of the invention.

FIG. 7 is a cross-sectional view of a cam follower rolling bearing according to a fourth embodiment of the present invention.

FIG. 8 is a cross-sectional view of a conventional sheave rolling bearing according to the first embodiment.

FIG. 9 is a sectional view of a conventional rolling bearing for a chain conveyor according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Roller (rolling element) 4 Lubricating oil 5 Shield plate 6 Collar part 7 Collar ring 10, 10a, 10b Side plate 11 Guide wheel 12 Radial groove 13 Circumferential groove 14 Cage 15 Inner ring shaft (inner ring) )

Continued on the front page F term (reference) 3J016 AA02 BB17 CA01 CA03 3J101 AA13 AA14 AA24 AA42 AA43 AA52 AA62 BA56 BA73 CA14 EA13 EA14 FA04 FA31 FA33 FA34 GA41 GA60

Claims (2)

[Claims] A rolling bearing in which a number of rolling elements are rotatably interposed between an outer ring and an inner ring, and a side plate that is in sliding contact with the outer ring or the inner ring is disposed beside these rolling elements. A rolling bearing, wherein the side plate is formed of bronze. 2. A rolling bearing in which a number of rolling elements are rotatably arranged in a plurality of rows between an outer ring and an inner ring, and a guide wheel is disposed between the plurality of rows of rolling elements. A rolling bearing, wherein the guide wheel is formed of bronze.