JP2000002257A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lighten the working of impact load applied to an inner ring and an outer ring on the interior of a bearing so as to prevent lowering of life of a bearing by providing at least either the outer ring outer peripheral surface or an inner ring inner peripheral surface with a buffer holding mechanism for holding a buffer member in a space up to a counterpart member to which the outer ring or the inner ring is fitted. SOLUTION: The outer peripheral surface 13b of an outer ring 13 of a rolling bearing 11 is provided with an oil film holding mechanism 16 for forming an oil film layer 15 as a buffer member in a space up to a bearing holding surface 5a of a housing 5 as a counterpart member for fitting of the outer ring 13. When impact or vibration is applied to the inner ring 1 or the outer ring 13 of the rolling bearing 11, the oil film layer 15 formed by the oil film holding mechanism 16 causes a squeeze phenomenon to permit very small displacement of the rolling bearing 11 and simultaneously damp the vibration load, thereby functioning as a buffer damper for absorbing and softening impact. Further, the inner peripheral surface of the inner ring 12 may be provided with the oil film holding mechanism 16 in a space up to the outer peripheral surface of the shaft member 6 as a counterpart member for fitting to the inner ring 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing which is suitably used for supporting a shaft at a portion where vibration or impact is frequently applied, such as a vibrating screen or a vibrating portion of a vibration motor.

[0002]

2. Description of the Related Art Rolling bearings such as ball bearings, self-aligning roller bearings, and cylindrical roller bearings are used to support a shaft in a vibrating section of a vibrating screen or a vibration motor. FIG. 6 shows a conventional example of such a rolling bearing mounting structure. The rolling bearing 1 shown here is a single row cylindrical roller bearing provided with a single row of cylindrical rollers 4 between an inner ring 2 having no brim and an outer ring 3 having flanges 3a on both sides.

The outer race 3 is tightly fitted to the housing 5, and is held in a state where the outer peripheral surface 3 b is brought into close contact with the bearing holding surface 5 a of the housing 5. Further, the shaft member 6 in the vibrating portion of the vibrating sieve is press-fitted into the inner ring 2, and the outer peripheral surface 6a of the shaft member 6 is in close contact with the inner peripheral surface 2a.

[0004]

However, in such a mounting structure, shocks and vibrations acting on the shaft member 6 and the housing 5 due to the vibration operation of the sieve are hardly attenuated to the inner ring 2 and the outer ring 3. The roller, which is transmitted, has a contact portion between the cylindrical roller 4 and the inner ring 2 inside the rolling bearing 1, a contact portion between the cylindrical roller 4 and the outer ring 3, a retainer (not shown) holding the cylindrical rollers 4 at a fixed interval, and each cylinder. It acts as an impact load on the contact portion with the roller 4 and the like. For this reason, there is a problem in that wear and fatigue at the contact portion inside the rolling bearing 1 are accelerated, and the life of the bearing may be shortened.

Therefore, in order to extend the life of the bearing, when it is used in a place where shock or vibration frequently acts, a rolling bearing with a load resistance one rank or two ranks may be adopted. In such a case, the size of the rolling bearing used becomes unnecessarily large, which causes a problem of an increase in the size of the device and an increase in equipment cost.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems. Even if an impact or vibration acts on the inner ring or the outer ring, the effect of the impact load on the inside of the bearing can be reduced. An object of the present invention is to provide a rolling bearing capable of preventing a reduction in the life of the bearing and, at the same time, reducing the size of the rolling bearing used in a portion where impact or vibration acts.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rolling bearing having an outer ring and an inner ring which rotate relative to each other via a rolling element. Alternatively, the present invention is attained by a rolling bearing provided with a buffer holding mechanism for holding a buffer between a mating member to which the inner ring is fitted.

According to the present invention, the buffer functions as a shock absorbing damper by holding the buffer on at least one of the outer peripheral surface of the outer race and the inner peripheral surface of the inner race. Therefore, even if an impact or vibration acts on the inner ring or the outer ring, the effect of the impact load on the inside of the bearing can be reduced. In addition, wear and fatigue due to impact loads at the contact portions inside the rolling bearing are reduced, so that the load-bearing performance in practical use is improved, and the rolling load of one rank or two ranks is increased for safety and the like. There is no need to use bearings.

In the present invention, for example, an oil film layer can be provided as a buffer, and an oil film holding mechanism can be provided as a buffer holding mechanism. According to this configuration, when an impact or vibration acts on the inner ring or the outer ring of the rolling bearing, the oil film layer formed by the oil film holding mechanism causes a squeeze phenomenon (a phenomenon in which a part of the oil film is crushed and flows). Thus, the rolling bearing allows a small displacement, and at the same time, diffuses the applied load and functions as a damper for absorbing and mitigating impact.

Further, in the present invention, a covering layer made of, for example, an elastic material may be provided as the buffer, and a covering layer holding mechanism may be provided as the buffer holding mechanism. According to this configuration, when an impact or vibration acts on the inner ring or the outer ring of the rolling bearing, the coating layer made of an elastic material undergoes elastic deformation, thereby permitting a minute displacement of the rolling bearing and at the same time damping the vibrating load acting thereon. It functions as a damper for absorbing and mitigating impact.

[0011]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a mounting structure of a rolling bearing according to a first embodiment of the present invention. The mounting structure of the rolling bearing according to the first embodiment includes an outer ring 13 on the outer peripheral surface 13 b of the outer ring 13 of the rolling bearing 11.
And an oil film holding mechanism 16 for forming an oil film layer 15 as a buffer between the bearing holding surface 5a of the housing 5 and the mating member.

The rolling bearing 11 is a single row cylindrical roller bearing provided with a single row of cylindrical rollers 4 between an inner ring 2 having no brim and an outer ring 13 provided with a brim 13a on both sides. Outer ring 13
The seal member groove 13c is provided on both sides of the outer peripheral surface 13b.

The oil film holding mechanism 16 is provided on the outer peripheral surface 1 of the outer race 13.
By mounting a seal member 17 made of an elastic material such as an O-ring into each seal member groove 13c on the seal member 3b, a space surrounded by the pair of seal members 17, the outer peripheral surface 13b, and the bearing holding surface 5a is defined. By filling the space with an appropriate amount of lubricating oil, an oil film layer 15 interposed between the bearing holding surface 5a and the outer peripheral surface 13b is formed.

The shaft member 6 in the vibrating portion of the vibrating sieve is press-fitted into the inner ring 2, and the outer peripheral surface 6 a of the shaft member 6 is in close contact with the inner peripheral surface 2 a of the inner ring 2.

In the above-described mounting structure of a rolling bearing, when an impact or vibration acts on the inner ring 2 or the outer ring 13 of the rolling bearing 11, the oil film layer 15 formed by the oil film holding mechanism 16 causes a squeeze phenomenon, and the rolling bearing 11 Function as a shock absorbing damper that absorbs and alleviates impact by attenuating the vibratory load that acts at the same time as allowing small displacements. Therefore, even if an impact or vibration acts on the inner ring 2 or the outer ring 13, the effect of the impact load on the inside of the bearing can be reduced, and a reduction in bearing life due to the effect of the impact load can be prevented.

Further, wear and fatigue due to an impact load at the contact portion inside the rolling bearing are reduced, so that the load-bearing performance in practical use is improved, and the load-bearing capacity is 1 rank or 2 ranks for safety and the like. Since it is not necessary to employ the upper rolling bearing, it is possible to reduce the size of the rolling bearing used in a portion where impact or vibration acts.

FIG. 2 shows a mounting structure of a rolling bearing according to a second embodiment of the present invention. The mounting structure of the rolling bearing according to the second embodiment includes an outer ring 2 of the rolling bearing 21.
3 is provided with an oil film holding mechanism 26 for forming the oil film layer 15 as a buffer between the outer ring 23 and the bearing holding surface 5a of the housing 5 which is a mating member of the outer ring 23.

The rolling bearing 21 is provided with a double row of spherical rollers 4a between the inner ring 22 and the outer ring 23 and a double row in which the inner peripheral surface (track surface) of the outer ring 23 in contact with the spherical rollers 4a is spherical. Self-aligning roller bearing. The outer ring 23 has seal member grooves 23c provided on both side edges of the outer peripheral surface 23b.

The oil film holding mechanism 26 is provided on the outer peripheral surface 2 of the outer race 23.
By mounting a ring member 27 made of an elastic resin material on each seal member groove 23c on the seal member 3b, a space surrounded by the pair of seal members 27, the outer peripheral surface 23b, and the bearing holding surface 5a is defined. By filling an appropriate amount of lubricating oil into this space, the oil film layer 15 interposed between the bearing holding surface 5a and the outer peripheral surface 23b is formed.

The shaft member 6 in the vibrating portion of the vibrating sieve is press-fitted into the inner ring 2, and the outer peripheral surface 6 a of the shaft member 6 is in close contact with the inner peripheral surface 2 a of the inner ring 2. That is, in the second embodiment, since the rolling bearing 21 becomes wider, the ring member 27 used for the oil film holding mechanism 26 is changed to a wider part made of an elastic resin material. Even with such a configuration, the same operation and effect as in the first embodiment can be obtained.

FIG. 3 shows a mounting structure of a rolling bearing according to a third embodiment of the present invention. The mounting structure of the rolling bearing according to the third embodiment includes the inner ring 3 of the rolling bearing 31.
2 is provided with an oil film holding mechanism 36 for forming an oil film layer as a buffer between the inner ring 32 and the outer circumferential surface of a shaft member which is a mating member of the inner ring 32.

The rolling bearing 31 is a single row cylindrical roller bearing provided with a single row of cylindrical rollers 4 between an inner ring 32 having no brim and an outer ring 3 having flanges 3a on both sides. The outer race 3 is tightly fitted to the housing 5, and is held in a state in which its outer peripheral surface 3 b is in close contact with a bearing holding surface 5 a of the housing 5. The oil film holding mechanism 36 has a stitch-shaped oil groove 37 formed on the inner peripheral surface 32a of the inner ring 32, and oil is accumulated in the oil groove 37. When the shaft and the inner ring 32 are relatively displaced by vibration, a rectangular surface between the oil grooves is formed. An oil film is formed on the surface.

As described above, even when the oil film is interposed between the inner ring 32 of the rolling bearing 31 and the outer peripheral surface of the shaft member fitted to the inner ring 32, the same operation and effect as in the first embodiment are obtained. Can be obtained.

FIG. 4 shows a mounting structure of a rolling bearing according to a fourth embodiment of the present invention. The mounting structure of the rolling bearing according to the fourth embodiment includes an inner ring 4 of the rolling bearing 41.
2 is provided with an oil film holding mechanism 46 for forming an oil film layer as a buffer between the inner ring 42 and the outer surface of a shaft member which is a mating member of the inner ring 42.

The rolling bearing 41 is provided with a double row of spherical rollers 4a between the inner ring 42 and the outer ring 43, and a double row in which the inner peripheral surface (track surface) of the outer ring 43 in contact with the spherical rollers 4a is spherical. Self-aligning roller bearing. The outer ring 43 is tightly fitted to the housing 5 and its outer peripheral surface 43b is
Is held in close contact with the bearing holding surface 5a.

The oil film holding mechanism 46 is provided on the inner peripheral surface 4 of the inner race 42.
An oil groove 47 is engraved spirally in 2a, and oil accumulates in the oil groove 47. When the shaft and the inner ring 42 are relatively displaced by vibration, an oil film is formed on a rectangular surface between the oil grooves.

Also in the case of the fourth embodiment, the rolling bearing 4
The same operation and effect as in the first embodiment can be obtained by the oil film layer interposed between the first inner ring 42 and the outer peripheral surface of the shaft member fitted to the inner ring 42.

In each of the above embodiments, the oil film holding mechanism is provided on one of the outer peripheral surface of the rolling bearing and the inner peripheral surface of the inner ring. However, the outer peripheral surface of the rolling bearing and the inner peripheral surface of the inner ring are provided. Both may be equipped with an oil film holding mechanism.

FIG. 5 shows a mounting structure of a rolling bearing according to a fifth embodiment of the present invention. The rolling bearing according to the fifth embodiment has an elasticity as a buffer interposed between the outer peripheral surface 53b of the outer ring 53 of the rolling bearing 51 and the bearing holding surface 5a of the housing 5 which is a mating member of the outer ring 53. It is provided with a coating layer 55 made of a material.

The rolling bearing 51 is a single row cylindrical roller bearing in which the cylindrical rollers 4 are provided in a single row between an inner ring 52 having no brim and an outer ring 53 provided with a brim 53a on both sides.

The coating layer 55 is a resin film having a predetermined elastic property, and is fixed and held on the outer peripheral surface 53b of the outer race 53. The shaft member 6 in the vibrating portion of the vibrating sieve is press-fitted into the inner ring 2, and the outer peripheral surface 6 a of the shaft member 6 is in close contact with the inner peripheral surface 2 a of the inner ring 2.

In the above-described rolling bearing 51, when an impact or vibration acts on the inner ring 52 or the outer ring 53 of the rolling bearing 51, the coating layer 55 undergoes elastic deformation, and allows the micro-displacement of the rolling bearing 51 and simultaneously acts vibration. Attenuate the load,
Functions as a shock absorbing damper that absorbs and reduces shock.

Therefore, even if an impact or vibration acts on the inner ring 52 or the outer ring 53, the effect of the impact load on the inside of the bearing can be reduced, and a reduction in the life of the bearing due to the effect of the impact load can be prevented. . In addition, wear and fatigue due to impact load at the contact portion inside the rolling bearing are reduced, so that the load-bearing performance in practical use is improved, and the rolling load is increased by one or two ranks for safety and the like. Since it is not necessary to employ a bearing, it is possible to reduce the size of the rolling bearing used in a portion where impact or vibration acts.

In the fifth embodiment, the coating layer 55 made of an elastic material is provided only on the outer peripheral surface of the outer ring of the rolling bearing.
Instead, the covering layer 55 is provided only on the inner peripheral surface of the inner ring,
Alternatively, even if the coating layer 55 is provided on both the outer peripheral surface of the outer ring and the inner peripheral surface of the inner ring, the function as a shock absorbing damper is similarly exerted by the coating layer 55, so that the life of the bearing due to an impact load can be prevented from being shortened. .

Although not shown, when a shock or vibration acts on the inner ring or the outer ring of the rolling bearing, a minute displacement of the rolling bearing is allowed, and at the same time, the applied load is diffused to absorb and reduce the shock. The function as the shock absorbing damper is as follows. The oil film holding mechanism or the elasticity described above is provided on at least one of the bearing holding surface of the housing in which the outer ring of the rolling bearing is fitted, or the outer peripheral surface of the shaft member fitted with the inner ring of the rolling bearing. It is also obtained when a coating layer made of a material is provided. That is, the rolling bearing itself has the same structure as that of the related art, and by changing the mounting structure to the housing, the same operation and effect as those of the above embodiments can be obtained.

As a mounting structure of a rolling bearing used in a machine or the like in which shocks and vibrations frequently act, there is a structure between an outer ring of the rolling bearing and a bearing holding surface of a housing in which the outer ring is fitted.
Alternatively, if at least one of the inner ring of the rolling bearing and the outer peripheral surface of the shaft member fitted to the inner ring has a configuration in which an oil film layer or a coating layer made of an elastic material is interposed, the same as in the above embodiments. In addition, the operation and effect of preventing the bearing life from being shortened by the impact load can be obtained.

In each of the above embodiments, the characteristics of oils and fats used for the oil film layer formed by the oil film holding mechanism, the materials such as seal members and ring members attached to rolling bearings for holding the oil film layer, or The elastic resin material or the like forming the coating layer may be appropriately selected according to the use conditions (such as the number of revolutions of the bearing and the use temperature) without departing from the gist of the present invention. Further, in each of the above embodiments, the roller bearing uses rollers as rolling elements, but it goes without saying that the present invention can also be applied to ball bearings using balls as rolling elements.

[0038]

According to the present invention, at least one of the outer peripheral surface of the outer ring and the inner peripheral surface of the inner ring is provided with a buffer holding mechanism for holding a buffer between the outer ring and the mating member to which the inner ring is fitted. Thereby, the buffer functions as a shock absorbing damper. Therefore, even if an impact or vibration acts on the inner ring or the outer ring, the effect of the impact load on the inside of the bearing can be reduced, and a reduction in bearing life due to the effect of the impact load can be prevented.

Since wear and fatigue due to an impact load at the contact portion inside the rolling bearing are reduced, the load-bearing performance in practical use is improved, and the load-bearing capacity is 1 rank or 2 ranks for safety and the like. Since it is not necessary to employ the upper rolling bearing, it is possible to reduce the size of the rolling bearing used in a portion where impact or vibration acts, and it is also possible to reduce the size of a device using the rolling bearing. .

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of a mounting structure for a rolling bearing according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a mounting structure for a rolling bearing according to a third embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a mounting structure for a rolling bearing according to a fourth embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a mounting structure for a rolling bearing according to a fifth embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a conventional mounting structure for a rolling bearing.

[Explanation of symbols]

 2 Inner ring 5 Housing 5a Bearing holding surface 12 Inner ring 13 Outer ring 13b Outer peripheral surface 15 Oil film layer 16 Oil film holding mechanism 17 Seal member 21 Rolling bearing 23 Outer ring 26 Oil film holding mechanism 27 Ring member 31 Rolling bearing 32 Inner ring 36 Oil film holding mechanism 37 Oil groove 41 Rolling bearing 42 Inner ring 46 Oil film holding mechanism 47 Oil groove 51 Rolling bearing 53 Outer ring 55 Coating layer

Claims (1)

[Claims] 1. A rolling bearing having an outer ring and an inner ring which rotate relative to each other via a rolling element, wherein at least one of an outer ring outer peripheral surface and an inner ring inner peripheral surface is fitted to a mating member to which the outer ring or the inner ring is fitted. A rolling bearing, further comprising a buffer holding mechanism for holding the buffer.