JP2002227844A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing capable of relaxing a force applied to a retainer and enhancing a life against damage and seizure of the retainer. SOLUTION: In the rolling bearing, pocket dimensions of the retainer are equally made different. When pocket diameter dimensions of one pocket D1 of pockets adjacent to each other are defined as R31 and R41, depth dimensions are defined as H31 and H41, pocket diameter dimensions of the other pocket D2 are defined as R32 and R42 and depth dimensions are defined as H32 and H42, the rolling bearing is constituted such that formulae: R31=R41<R32=R42 and H31=H41<H32=H42 are satisfied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing used for general industrial equipment in which a radial load is relatively large as compared with a moment load or an axial load.

[0002]

2. Description of the Related Art In general, a cage 100 used in a deep groove ball bearing is formed by a pair of steel plate punched cages 101 and 102. In FIG. 6, one retainer 101 and the other retainer 102
0, and the dimensions and shapes of the retainers 101 and 102 are the same. That is, the pocket diameter R1 of the adjacent pockets 101a and 101b of the retainer 101
1 and R12, depth dimensions H11 and H12, and cage 1
02, pocket diameters R21 and R22 and depths H21 and H22 of the adjacent pockets 102a and 102b are the same (R11 = R12 = R21 = R22, H11 = H).
12 = H21 = H22).

[0003]

FIG. 7 is a diagram showing the distribution of loads acting on the bearing when the radial load Fr is much larger than the axial load Fa. In such a use condition, a rolling element load acting on the rolling elements 300 in one bearing appears to be zero, and a non-load zone and a load zone exist. The same applies to a case where the bearing is rotated in a state where the radial load is larger than the moment load or in a state where the inner and outer rings are relatively inclined.

When the bearing is rotated in such a state, when the rolling element 300 slips in the non-load zone when entering the load zone from the non-load zone, the rolling slip decreases in the load zone. It becomes closer to the calculated rotation speed. Conversely, when going out of the load zone into the non-load zone, the rotation slip increases.

[0005] That is, in the load zone and the non-load zone, the rotation speed of the rolling element 300 is fast in the load zone and slow in the non-load zone, and the rotation speed of the rolling element 300 is different in one bearing. . Increasing the rotation speed of the rolling element 300 means pushing the retainer 100 with the rolling element 300, and decreasing the rotation speed means pushing the rolling element 300 with the retainer 100. In FIG. 7, the force by which the rolling element 300 pushes the cage 100,
Represents the force pressing the rolling element 300. This force is-
In between, it acts as a compressive stress, and in-between, it acts as a tensile stress.

[0006] If the compressive stress and the tensile stress are within the fatigue limit of the cage material, the cage will not be broken. However, if the fatigue stress exceeds the fatigue limit, the cage will be broken and the bearing will seize ( In particular, when there is a moment load or an installation error, the rotation speed appears remarkably in each rolling element.)
On the other hand, improvement such as changing the cage material or performing surface treatment is one of the countermeasures, but causes a cost increase. On the other hand, the improvement in which the size of the pocket diameter or the like is increased increases the amount of movement of the retainer, and the contact between the seal plate and the retainer occurs, so that the pocket diameter cannot be sufficiently increased.

[0007] The present invention has been made in view of the above-mentioned problems of the prior art.
An object of the present invention is to provide a rolling bearing in which a force acting on a cage is reduced, and a life of a cage broken and seized is improved.

[0008]

The technical means achieved by the present invention to achieve the above object is to provide an outer ring, an inner ring, a plurality of rolling elements incorporated between the outer ring and the inner ring, and And a cage for guiding and holding a plurality of rolling elements, and the cage has pockets for guiding and holding the rolling elements, and the pockets have different dimensions.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a rolling bearing according to an embodiment of the present invention.

FIG. 1 shows an embodiment of the rolling bearing of the present invention, in which an outer ring 2, an inner ring 3, a plurality of rolling elements (balls) 4 which are incorporated between the outer ring 2 and the inner ring 3, and the balls 4 are provided. Deep groove ball bearing 1 composed of a retainer 6 for guiding and holding the inner ring and a sealing plate (seal or shield) 5 disposed between the outer ring 2 and the inner ring 3 if necessary. Contains grease and lubricant. Note that the rolling bearing described in the present embodiment is merely one embodiment, and the design can be appropriately changed within the scope of the present invention without being limited to this embodiment. Cage 6
Structures other than the above, that is, the outer ring 2, the inner ring 3, the rolling elements 4, and the sealing plate 5 are not particularly limited, and a known structure can be selected within the scope of the present invention. Further, other configurations can be added as needed.

FIG. 2 shows a cage 6 used in this embodiment.
FIG. 5 is a cross-sectional view partially showing a main part of one embodiment, wherein the retainer 6 is a punched retainer made of a steel plate, two retainers are used as a pair, and one retainer 6a and the other retainer 6b are used. Are caulked with rivets 9 and 10, and adjacent pockets D1 and D
2, D1, D2,... Are equally distributed.

The pocket dimensions are, for example, a pocket diameter dimension R and a pocket depth dimension H, and the diameter dimension R and the depth dimension H are alternately made small and large and shallow in adjacent pockets D1, D2, D1, D2,. It is changing with depth. The number of pockets in the retainer can be appropriately selected within the scope of the present invention, and generally has a general number. Also, the inner diameter and outer diameter of the cage can be appropriately selected.

That is, in the cage 6 in one bearing 1, the pocket diameter dimension R of one adjacent pocket D1
31 and R41, depth dimensions H31 and H41, pocket diameter dimensions R32 and R42 of the other pocket D2, and depth dimensions H32 and H42, R31 = R41 <R32 = R.
42, H31 = H41 <H32 = H42. With this configuration, the rolling element 4 having a high rotation speed receives the force in the small pocket D1, and does not receive the force in the large pocket D2.

According to this embodiment, by enlarging one of the adjacent pockets, the force acting on the retainer 6 is reduced, which is advantageous for the breakage of the retainer. By making the other pocket diameter dimension R smaller than the one pocket diameter dimension R, the movement amount of the cage is regulated by the smaller one of the pocket diameter dimensions R, so that the contact between the seal plate and the like and the cage is eliminated. The pocket diameter R and the pocket depth H
Can be appropriately set within the scope of the present invention, and is not specifically interpreted.

Accordingly, the compressive force shown in FIG.
It is advantageous for the cage breakage due to the reduction of the tensile force therebetween.

In the cage having the adjacent pockets having different dimensions, the pocket dimensions R31 and R41 constituting the pocket D1 and the pocket D
Preferably, a positioning mechanism is provided for the purpose of aligning R32 and R42 constituting the two.

The positioning mechanism provided for the purpose of adjusting the phase of the different pockets is such that the rivet hole dimensions are alternately changed, and the rivet 9 having the hole diameter dimension d1 is replaced by the thick rivet 9 on the rivet hole 7 side having the hole diameter dimension d1. A thin rivet 10 is inserted in the hole 8 side in advance.

That is, by making one of the adjacent rivet hole (diameter) dimensions d1 larger and the other one of the hole diameter dimensions d2 smaller, the rivet length dimensions are different and the pockets can be phase-matched. L1 is the length of the thick rivet 9,
L2 indicates the length of the thin rivet 10.

In the rivets 9 and 10, the base end side diameters d3 and d4 of the respective insertion portions are the same as the rivet hole diameters d1 and d2. The rivet hole diameters d1 and d2 are each smaller than the rivet hole diameters d1 and d2 to improve ease of insertion. Note that the rivet hole diameter and hole depth and the rivet length and diameter can be appropriately set within the scope of the present invention, and are not interpreted as being limited.

Further, as shown in FIG. 5B, by making the pocket inner surface 11 of the pocket D2 having a larger pocket dimension not a single radius dimension, but a straight shape or the like, the lubricant can easily enter the pocket and retain. Instrument noise and wear of the cage pocket are reduced. Fig. 5
As shown in (a), since the pocket inner surface 12 is regulated by the pocket D1 having a small diameter of the retainer pocket in which the entire pocket inner surface 12 is formed in a round shape, the sealing inner plate 11 of the pocket D2 is formed in a straight shape so that the sealing plate (seal plate) 5 is formed. There is no fear of contact between the cage and the cage 6.

[0021]

According to the present invention, since the force acting on the cage is reduced, the cage is advantageously broken and the seizure life is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rolling bearing of the present invention.

FIG. 2 is a partial cross-sectional view of the retainer.

FIG. 3 is a partially enlarged sectional view of one cage.

FIG. 4 is a cross-sectional view illustrating an embodiment of a positioning mechanism.

FIG. 5 is a cross-sectional view showing a state where one pocket shape is round and the other pocket shape is straight.

FIG. 6 is a partial cross-sectional view of a cage used for a conventional rolling bearing.

FIG. 7 is a distribution diagram of loads acting on the bearing when the radial load Fr is larger than the axial load Fa.

[Explanation of symbols]

 2: Outer ring 3: Inner ring 4: Rolling element 6: Cage 7,8: Rivet 9,10: Rivet D1, D2: Pocket R: Pocket hole diameter dimension H: Pocket depth dimension d1, d2: Rivet hole diameter

Claims (1)

[Claims] An outer ring, an inner ring, a plurality of rolling elements incorporated between the outer ring and the inner ring, and a retainer for guiding and holding the plurality of rolling elements. A rolling bearing having a pocket for guiding and holding a rolling element, wherein the pocket dimensions are equally distributed.