JP2540979Y2 - Rolling bearing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing of the type used for machine tools and other various devices, and which naturally supplies a lubricant such as grease sealed in a reservoir portion with operation.

[0002]

2. Description of the Related Art In grease lubrication, grease is generally used by sealing grease in the interior of a bearing, that is, in the gaps between components such as rolling elements, inner and outer rings, and cages.

In this case, if the amount of grease held between the components is small, the lubrication life of the bearing is shortened. Although it is possible to increase the amount of grease to be filled to some extent, if a large amount of grease is filled between the above components, the heat generated by the agitation resistance of the grease will increase in the early stage of operation, and excess grease will be discharged and used. There is a problem that the time required for the break-in operation to improve the condition becomes long. Even if the amount of grease to be enclosed is large,
Since the amount of retained grease is reduced by the centrifugal force during rotation, it is difficult to improve the grease life from this. In particular, when the bearing is used for a machine tool, heat generated in the bearing affects the processing accuracy, so that it is necessary to reduce it as much as possible, and it is also desired to improve durability.

As a solution to such a problem,
The present applicant has proposed a method in which a lubricant such as grease is sealed in a reservoir provided in the inner ring spacer to extend the lubrication life of the bearing (Japanese Utility Model Application No. 3-49662, Japanese Utility Model Application No. Hei 3-7760).
No. 9). In these proposals, a small gap generated by unevenness of the surface roughness of the mating surface and a minute slit formed in the mating surface are used as the lubricant outflow passage, and the lubricant flows from the pool to the vicinity of the rolling surface. Is carried out by utilizing a capillary phenomenon due to a minute gap or a minute slit in the lubricant outflow path, or a centrifugal force due to rotation. For this reason, the effect of restricting the outflow amount was large, and a very small amount of lubricant could be supplied even during high-speed rotation. The outflow amount is adjusted by the surface roughness, the size and the number of the minute slits, and the like.

[0005]

The inner ring spacer filled with the lubricant has an inner peripheral part having a peripheral groove serving as the reservoir at the axial center of the outer peripheral surface, and both ends covered by the peripheral groove. And an outer peripheral part which is tightly fitted on the outer periphery of the thick part. However, since it is tightly fitted to the thick portions on both sides in this way, it is difficult to disassemble and reassemble after assembling once. Forcible disassembly and reassembly may cause subtle changes in the condition of the mating surfaces, and may cause problems such as a change in the amount of lubricant seeping out. Therefore, it is basically not disassembled, and after the lubricant filled in the inner ring spacer is used up, the entire bearing or the entire bearing is replaced. Thus, it is uneconomical because the inner ring spacer cannot be reused, and a bearing that can easily refill and reuse the encapsulated lubricant is desired.

The object of the present invention is to supply a small amount of the lubricant filled in the pool portion with the operation, to improve the lubrication life, and to easily disassemble and reassemble the lubricant-filled inner ring spacer. An object of the present invention is to provide a rolling bearing that can easily replenish a filled lubricant.

[0007]

According to a first aspect of the present invention, there is provided a rolling bearing in which an inner race spacer provided with a lubricant reservoir space is formed by an inner peripheral part and an outer peripheral part which are fitted into and out of each other.
Further, the inner peripheral part is formed by a pair of divided inner peripheral parts divided in the axial direction. The fitting surface between the inner peripheral part and the outer peripheral part is a part of a minute lubricant outflow passage that opens from the lubricant storage space to the vicinity of the rolling path of the rolling element.

According to a second aspect of the present invention, there is provided a rolling bearing comprising: an inner race spacer having a lubricant reservoir space therein; an inner peripheral part having an outer flange having a flange on one outer periphery; An outer peripheral part with an inner flange having a flange part fitted on the outer periphery of the flange part and abutting on the end surface of the inner peripheral part at the other end. The fitting surface between the inner peripheral part and the outer peripheral part is a minute lubricant outflow passage that opens from the lubricant reservoir space to the vicinity of the rolling path of the rolling element.

[0009]

According to this structure, the lubricant or its component in the lubricant reservoir space passes through the fitting surface between the inner peripheral part and the outer peripheral part of the inner race spacer, and is accompanied by the capillary phenomenon and rotation of the inner race spacer. It is supplied near the rolling element by centrifugal force. Therefore, the supply is performed little by little over a long period of time.

After the lubricant sealed in the lubricant reservoir space of the inner race spacer is used up, the inner race spacer is disassembled, replenished with lubricant, and reassembled. In this case, in the rolling bearing according to the first aspect, since the inner peripheral part of the inner race spacer is composed of a pair of divided inner peripheral parts divided in the axial direction, the outer peripheral part can be easily disassembled and reassembled. Further, in the configuration of claim 2, the inner race spacer is formed by fitting the inner peripheral part with the outer flange and the outer peripheral part with the inner collar, so in this case also, the inner peripheral part and the outer peripheral part of the inner race spacer are fitted. Can be easily disassembled and reassembled.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. This embodiment is an example applied to an inner ring rotating double row angular contact ball bearing.

In this double row bearing, the inner rings 2 of the bearings 1 and 1 in each row are individually provided and the outer ring 3 is shared. Each of the inner races 2 includes only a portion on the rolling side of the contact angle, and does not have a portion on the center side and the counter bore side in the drawing. An inner race spacer 4 filled with a lubricant is sandwiched between the pair of inner races 2 and 2. The rolling element 5 is spherical, and is held in a pocket of the retainer 6. The inner race 2 is fixed to a rotating shaft (not shown), and the outer race 3 is fixed to a housing (not shown) which is a stationary member.

The inner race spacer 4 comprises an inner peripheral part 4a and an outer peripheral part 4b fitted inside and outside, and is provided between a peripheral groove provided on the outer diameter surface of the inner peripheral part 4a and the outer peripheral part 4b. A lubricant reservoir space 7 is formed. The inner peripheral part 4a is composed of a pair of divided inner peripheral parts 4a1 and 4
a2. In addition, a through-hole (not shown) for preventing negative pressure which penetrates the lubricant reservoir space 7 is provided on the inner diameter surface of the inner peripheral part 4a as necessary.

Each divided inner peripheral part 4a1, 4 of the inner peripheral part 4a
a2 and the outer peripheral part 4b are tightly fitted to each other,
The mating surface 9 has a processed surface roughness (for example, 0.2 to
(10 μm), a minute gap is formed.
Further, the two divided inner peripheral parts 4a1 and 4a2 are pressed against each other on the divided surface 8 by being sandwiched between the inner rings 2 and 2 from both sides.

As shown in FIG. 2, a slit 10 having a slight width d is provided entirely or partially between the side end surface of the outer peripheral part 4b of the inner race spacer 4 and the inner race 2. The slit 10 and the fitting surface 9 form a lubricant outflow path 11 that opens from the lubricant storage space 7 to the rolling path 12 of the rolling element 5.

At the time of assembling the bearing, the rolling path 12 is filled with a lubricant, but the lubricant is generally smaller than the sealing, and the lubricant is filled in the lubricant storage space 7 as much as possible.
As the lubricant to be filled in the lubricant reservoir space 7, in addition to general semi-solid or solid grease, liquid grease, plastic grease, oil-impregnated resin, woven cloth or felt containing lubricating oil, or the like is used. can do. Plastic
Cook grease is made of ultra-high molecular weight polyethylene or low molecular weight
Heat the mixture of grease with resin such as polyethylene.
It is a composition that is melted and solidified by cooling.
Something that seeps into is being developed.

According to this structure, the lubricant or its component sealed in the lubricant reservoir space 7 oozes out from the fitting surfaces 9 of the inner and outer components 4a and 4b of the inner race spacer 4 in both axial directions by capillary action. . The lubricant or its component that has oozed out to the side end surface of the inner race spacer 4 flows in the outer diameter direction due to the centrifugal force accompanying the rotation of the inner race spacer 4, and is supplied to the raceway surface of the rolling path 12. When the lubricant is a semi-solid grease, the grease base oil mainly separates from the thickener and flows out.

This bearing is provided with the lubricant storage space 7 as described above.
The lubrication life is improved because the lubricant or its components enclosed therein are replenished little by little. Also, rolling path 1
2, the amount of lubricant to be sealed between the parts such as the rolling elements 5 and the retainer 6 can be reduced so that a small amount of lubrication can be achieved. Therefore, heat generation due to agitation resistance is reduced, and the running-in operation time required to improve adaptation is reduced. Be shortened.

When the lubricant enclosed in the inner race spacer 4 has been used up, the inner race spacer 4 is removed from the rolling bearing and disassembled, and the lubricant is refilled into the lubricant reservoir space 7 for reassembly. In this case, the inner peripheral part 4a of the inner race spacer 4 is divided into two divided inner peripheral parts 4a1 and 4a2, and each of the divided inner peripheral parts 4a1 and 4a2 has one fitting surface 9 for the outer peripheral part 4b. Peripheral part 4 in an interference fit state
b can be easily disassembled and assembled. Therefore, disassembly and reassembly can be performed without impairing the finished surface roughness of the mating surface 9 that greatly affects the amount of lubricant oozing out, and the filled grease can be easily refilled, and the inner ring spacer 4 can be reused. Can be planned.

The inner ring spacer 4 shown in FIG. 3 may be used in place of the inner ring spacer 4 in the embodiment shown in FIG. The inner race spacer 4 in FIG. 3 includes an outer peripheral part 4b and divided inner peripheral parts 4a1,
The fitting surface 9 with 4a2 is formed as a tapered surface in which each end portion is widened. When the inner ring spacer 4 of FIG. 4 is used for the angular contact ball bearing of FIG. 1, the bearing preload is set when the two divided inner peripheral parts 4a1, 4a2 are tightened in the axial direction by the inner rings 2, 2 on both sides. However, at the same time, the dimensions of each part are set so that an appropriate interference is given to the fitting surface 9 between the outer peripheral part 4a and the divided inner peripheral parts 4a1 and 4a2. Other configurations are the same as those in the above embodiment.

In this case, the inner peripheral part 4 is
Since it is divided into the divided inner peripheral parts 4a1 and 4a2, and the fitting surface 9 with the outer peripheral part 4b is a tapered surface, disassembly and assembly can be performed more easily, and fitting during disassembly and reassembly is performed. The change in the finished surface roughness of the mating surface 9 can be further reduced.

FIG. 4 shows still another embodiment. This example is an example in which the present invention is applied to a double-row angular contact ball bearing having an outer ring 3a and an inner ring 2 which are independent from each other in each row of bearings 1 and 1. An inner ring spacer having a structure shown in FIG. 4 are provided. Reference numerals 13 and 14 indicate a shaft and a housing, respectively. Also in this case, the inner race spacer 4 can be easily disassembled and reassembled similarly to the above embodiments.

FIG. 5 shows an embodiment according to the second aspect.
This example is an example applied to a single-row angular contact ball bearing, and includes an inner ring 15, an outer ring 16, a rolling element 17 held by a retainer (not shown), and an inner ring spacer 18. .
The inner ring 15 includes only a portion on the rolling side of the contact angle, and the inner ring spacer 18 is arranged within the width of the outer ring 16 on the other side.

The inner race spacer 18 includes an inner peripheral part 18a with an outer flange having a flange 19 on the outer periphery of the end on the inner ring 15 side, and an outer peripheral part 18b with an inner flange having a flange 20 on the inner periphery at the other end. Become. The outer peripheral component 18b is tightly fitted to the flange 19 of the inner peripheral component 18a, and abuts on the end face of the inner peripheral component 18a at the flange 20. An annular lubricant storage space 24 is formed between the inner peripheral part 18a and the outer peripheral part 18b.

The flange 19 of the inner part 18a and the outer part 18
The fitting surface 21 with b is formed as a tapered surface that spreads toward the inner ring 15, and a fine gap is formed on the fitting surface 21 by the unevenness due to the surface roughness of the processing finish similarly to the embodiment of FIG. 1. A slit 22 is formed between the side end surface of the outer peripheral part 18b and the inner ring 15 in the same manner as in the above-described embodiments. The slit 22 and the fitting surface 21 allow the rolling element 17 A lubricant outflow path 23 that opens to the rolling path is configured.

Also in this case, a small amount of lubricant in the lubricant reservoir space 24 is supplied via the fitting surface 21 in the same manner as in the above-described embodiments. Further, in this embodiment, the inner race spacer 18 is composed of the inner peripheral part 18a with the outer flange and the outer peripheral part 18b with the inner flange, and the fitting surface 21 is a tapered surface. The disassembly and reassembly of the seat 18 can be easily performed, and the filled lubricant can be replenished without changing the situation of the fitting surface 21 much. Note that the fitting surface 21 does not necessarily have to be formed as a tapered surface.

FIGS. 6 and 7 show still another embodiment. In this example, a small groove 9a is formed in the fitting surface 9 in the embodiment of FIG. This minute groove 9a may be provided in either the inner peripheral part 4a or the outer peripheral part 4b, but in this embodiment, it is provided in the inner peripheral part 4a as shown by oblique lines in FIG. The minute grooves 9a are provided in the axial direction over the entire length of the thick portion of the inner peripheral part 4a, and are provided at a plurality of positions in the circumferential direction. The depth of the fine groove 9a is such that the lubricant is retained without flowing out due to its own surface tension when the rotation is stopped, and is preferably 0.1 mm or less. For example, it is formed with a groove depth of about 0.03 to 0.05 mm. The groove width is formed, for example, to about 0.2 mm. The processing of the minute grooves 9a is performed by etching or rolling. Other configurations are the same as those in the above embodiment.

When the fine grooves 9a are formed in the fitting surface 9 as described above, the lubricant or its component is finer due to the capillary phenomenon than in the case where the gap due to the surface roughness of the fitting surface is used as the flow path. The entire groove 9a is easily filled. Therefore, even when the rotation speed is low, the bleeding of the lubricant becomes easy, and the lubricity when used at low speed rotation is improved.

In each of the embodiments shown in FIGS. 3 to 5, the minute grooves 9a shown in the embodiment of FIG.
May be formed. Further, in each of the above embodiments, the lubricant storage spaces 7 and 24 are formed in an annular shape, but the lubricant storage space 7 may be divided into a plurality of portions in the circumferential direction.
The present invention is not limited to angular contact ball bearings, but can be applied to rolling bearings in general.

[0030]

The rolling bearing according to the present invention is provided with an inner race spacer having a lubricant reservoir space therein, and the inner race spacer is composed of an inner peripheral part and an outer peripheral part which are fitted to each other, and a fitting surface thereof. Is used as the lubricant outflow passage, so that the lubricant or its component sealed in the lubricant reservoir space is replenished to the vicinity of the rolling element by a capillary phenomenon or centrifugal force caused by rotation of the inner ring spacer. Therefore, the lubricant is replenished little by little over a long period of time, and an excellent lubrication life can be obtained.

Further, in the rolling bearing according to the first aspect, since the inner peripheral part of the inner race spacer is composed of a pair of divided inner peripheral parts divided in the axial direction, the inner peripheral part is fitted with respect to the outer peripheral part fitted in an interference fit state or the like. Easy disassembly and reassembly. Also in the case of the configuration of claim 2, since the inner race spacer is formed by fitting the inner peripheral part with the outer flange and the outer peripheral part with the inner collar, the inner peripheral part and the outer peripheral part can be disassembled and reassembled. Easy to do. For these reasons, both the bearings of claim 1 and claim 2 can easily refill and reuse the lubricant after using up the filled lubricant.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of one embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a sectional view of an inner ring spacer according to another embodiment of the present invention.

FIG. 4 is a sectional view of still another embodiment of the present invention.

FIG. 5 is a sectional view of still another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a part of an inner race and an inner race spacer according to still another embodiment of the present invention.

FIG. 7 is a perspective view of an inner peripheral part of the inner race spacer.

[Explanation of symbols]

2 ... inner ring, 3 ... outer ring, 4 ... inner ring spacer, 4a ... inner peripheral parts,
4a1, 4a2 ... divided inner peripheral parts, 4b ... outer peripheral parts, 5 ...
Rolling element, 6 retainer, 7 lubricant storage space, 9 fitting surface, 10 slit, 11 lubricant outlet path, 15 inner ring, 16 outer ring, 17 rolling element, 18 inner ring spacer , 18
a: inner peripheral part with outer flange, 18b ... outer peripheral part with inner collar, 2
1 ... fitting surface, 22 ... slit, 24 ... lubricant reservoir space,
23 ... Lubricant outflow path

Claims (2)

(57) [Scope of request for utility model registration] An inner ring spacer formed of an inner peripheral part and an outer peripheral part which fits inside and outside each other and has a lubricant reservoir space between both parts is provided, and an inner ring spacer is provided between the inner peripheral part and the outer peripheral part through a fitting surface of the inner peripheral part and the outer peripheral part. A small lubricant outflow passage extending from the lubricant reservoir space to the vicinity of the rolling path of the rolling element, wherein the inner peripheral part is formed by a pair of divided inner peripheral parts that are axially divided from each other. 2. An inner ring spacer having a lubricant reservoir space inside the inner ring spacer, the inner ring spacer being provided with an outer peripheral part having an outer flange having a flange at one end outer periphery, and one end provided with the flange of the inner peripheral part. And an outer peripheral part with an inner flange having a flange at the other end that abuts against the end surface of the inner peripheral part. The lubrication is performed through a fitting surface between the inner peripheral part and the outer peripheral part. A rolling bearing provided with a minute lubricant outflow passage that opens from the agent reservoir space to the vicinity of the rolling path of the rolling element.