JPH07103228A - Spacer for rolling bearing - Google Patents

Abstract

PURPOSE:To stably hold and supply grease by providing a circular groove for forming in a spacer a grease holding space separated from a bearing inside space and providing a grease supply passage for connecting thus circular groove to the bearing inside spaces on both sides. CONSTITUTION:A spacer 1 is provided with flange partition walls 14, 15, which construct a circular groove S separated from bearing inside spaces 43, 53 of rolling bearings 4, 5, and a partition wall 16, which divides the circular groove S into two parts. Pores 17, 18, which serves as grease supply passages connecting the circular groove S and the bearing inside spaces 43, 53 of the rolling bearings 4, 5, are formed in the partition walls 14, 15. When the spacer 1 is built in a housing 3, the predetermine amount of grease is filled inside the circular groove S so that the grease is gradually fed via the pores 17, 18 in the rotation of the rolling bearings 4, 5. Therefore, the shortage of the grease in the rolling bearings 4, 5 is prevented for a long time, and good lubricating performance is secured. The circular groove S is divided into two parts by the partition wall 16, and an eccentric distribution of the grease is prevented in the circular grove S, so that the grease can be evenly supplied to the rolling bearings 4, 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spacer for a rolling bearing which holds two rolling bearings axially separated from each other by a predetermined distance.

[0002]

2. Description of the Related Art Conventionally, in a bearing device as shown in FIG. 5, rolling bearings 93, 94 arranged in a housing 92 in a state of being separated from each other in the axial direction of a rotary shaft 91 are arranged between inner rings 93a, 94a. And a pair of spacers 95 and 96 that are in contact with the rotating shaft 91 and the housing 92, respectively, are arranged between the outer ring 93b and the outer ring 94b.

The space 97 between the spacers 95 and 96 is filled with grease in order to ensure the lubricity of the rolling bearings 93 and 94.

[0004]

However, the spacer 9 described above is used.
5 and 96, the grease-filled space 97 communicates with the bearing inner spaces 93c and 94c of the rolling bearings 93 and 94. Therefore, for example, when the spacer width is wide, or when vibrations of an aircraft, an automobile, etc. occur. When it is used in a bearing device of a device to which an acceleration G is applied, holding of grease is unstable, and the rolling bearings 93 and 94 generate heat (agitating heat) due to entrainment of a large amount of grease or the rolling bearing 9 due to outflow of grease.
This causes problems such as shortening the life of 3,94.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a spacer for a rolling bearing capable of stably holding and supplying grease.

[0006]

In order to solve the above-mentioned problems, a spacer for a rolling bearing according to the present invention is a stationary bearing between races of a rolling bearing arranged in a state of being axially separated by a predetermined distance. And a ring-shaped groove that forms a space for holding grease that is isolated from the bearing inner space between the spacer and the stationary member to which the spacer is attached. It is characterized in that it has a path for grease supply that connects the annular groove and the bearing inner spaces of the rolling bearings on both sides.

Further, in the spacer of the present invention, it is preferable that the annular groove is axially divided into two by a partition wall. Further, in the spacer of the present invention, it is preferable that thin-walled portions for pressurizing the rolling bearing are formed on the side wall portions on both sides of the annular groove, which are in contact with the stationary side races.

[0008]

In the rolling bearing spacer of the present invention having the above-mentioned structure, the grease is retained in the annular groove provided separately from the bearing inner space, and the grease is passed through the route for supplying the grease. Since it is configured to be gradually supplied to the bearing internal space of the rolling bearing, even if the acceleration G is applied, the grease retention is not destabilized and a large amount of grease does not move. There is no problem such as heat generation of the rolling bearing due to the above, or shortening of the life of the rolling bearing due to the outflow of grease.

Further, in the present invention, since the size of the annular groove can be set independently, the optimum grease storage amount can be selected in accordance with various characteristics of the grease (soft type, hard type, etc.). There are also advantages. It should be noted that the annular groove and the path must be provided in the stationary spacer that is stationary together with the stationary bearing ring, not in the rotating spacer that rotates with the rotating bearing ring. When the annular groove and the path are provided in the rotating spacer, the centrifugal force due to the rotation of the spacer may cause grease to blow out through the path, but on the stationary side there is no such risk. .

Further, when the annular groove is divided into two in the axial direction by the partition wall, the space volume thereof is suppressed to a necessary minimum, so that the uneven distribution of grease in the annular groove is prevented and the spacer is Grease can be evenly supplied to the rolling bearings on both sides. Also, the paths provided on both sides of the spacer to supply the grease to the rolling bearings on both sides are also blocked by the partition wall, so that when acceleration G is applied in the axial direction, one of the paths on both sides is blocked. It also serves as an air intake port and prevents grease from being blown out from the other path.

Further, when the partition wall is provided, the rigidity is increased accordingly, so that there is an advantage that the annular groove can be made larger while maintaining the function as a spacer. Further, when the spacer has a thin portion for pressurizing the rolling bearing on both sides of the annular groove, which is in contact with the stationary side bearing ring, a constant pressure can be applied to the rolling bearings on both sides. Unlike the fixed-position pressurization spacer, the pressurization does not change depending on the temperature, and the pressurization is constant. Not only is there a possibility that the spring member will not be displaced or fall off, and constant pressure cannot be applied, as in the case where constant pressure is applied by a spring member that is separate from the spacer. Compared to the case where the spring member is used, the assemblability in the bearing device is also improved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment thereof. First, the embodiment of FIGS. 1A and 1B will be described. As shown in these figures, the spacer 1 of this embodiment is
Are the outer rings 42, 5 of the rolling bearings 4, 5 arranged in the housing 3 in a state of being separated from each other in the axial direction of the rotary shaft 2 by a predetermined distance.
It is arranged in contact with both outer rings 42 and 52 and the housing 3 between the two. On the other hand, a spacer 6 is arranged between the inner rings 41 and 51 of the bearings 4 and 5.

The spacer 1 is arranged between the outer races 42, 52 and the housing 3 and a pair of ring-shaped contact portions 11, 12 and between the pair of contact portions 11, 12 so as to be separated from the housing 3. The ring-shaped body portion 13 and the body portion 13 and the contact portions 11 and 12 are connected to each other, and the bearing inner space 4 of the rolling bearings 4 and 5 is formed between the body portion 13 and the housing 3.
The ribs 14 and 15 which form the annular groove S isolated from the grooves 3 and 53 and the partition 16 which is formed between the body 13 and the housing 3 and divides the annular groove S into two in the axial direction. , Are integrally formed of a metal material or the like.

Further, the ribs 14 and 15 have pores 17 and 18 as passages for supplying grease, which connect the annular groove S and the bearing inner spaces 43 and 53 of the rolling bearings 4 and 5, respectively.
Are formed. In the figure, symbols 44 and 54 are
Rolling elements of rolling bearings 4 and 5, respectively, reference numerals 45 and 55
Indicate the cages of the rolling bearings 4 and 5, respectively.
Further, the reference numeral 7 is screwed into the rotary shaft 2 and is provided between the step portion 21 of the rotary shaft 2 and the inner ring 4 of the pair of rolling bearings 4 and 5.
It is a nut that holds the spacers 1 and 51 and the spacer 6 between them and regulates the movement of these members in the axial direction. Further, the reference numeral 8 is fixed to one end of the housing 3, and a pair of rolling bearings 4, 5 are provided between the reference numeral 8 and the flange 31 at the other end of the housing 3.
Is a bearing lid for sandwiching the outer rings 42, 52 and the spacer 1 and fixing these members to the housing 3.

In the spacer 1 of the above embodiment, when the annular groove S is filled with a predetermined amount of grease when it is assembled into the housing 3, the pores 1 are generated when the rolling bearings 4 and 5 rotate.
Since it is gradually supplied little by little through 7 and 18, the rolling bearings 4 and 5 are prevented from running out of grease for a long period of time, and good lubricating performance is secured. Also, the annular groove S
Is divided into two by the partition wall 16 in the axial direction, and the grease is prevented from being unevenly distributed in the annular groove S. Therefore, the grease can be uniformly supplied to the rolling bearings 4 and 5 on both sides of the spacer 1. You can

If a greasing hole and a discharge hole are provided in the housing 3 at positions corresponding to the two annular grooves S, respectively, and grease is supplied from the greasing hole to the annular groove S,
It is also possible to use it as a greasing type bearing continuously for a long period of time. Moreover, since the annular groove S is isolated from the bearing inner spaces 43 and 53 of the rolling bearings 4 and 5 except that it is connected by the fine holes 17 and 18, a large amount of grease moves and the rolling bearings 4 and 5. 5 is prevented from generating heat and its life is shortened, and since the pores 17 and 18 are blocked by the partition wall 16, the acceleration G is increased in the axial direction.
In the case of being damaged, one of the pores 17 and 18 on both sides serves as an air intake port and the grease is prevented from blowing out from the other.

Furthermore, the rigidity of the spacer 1 is improved by the amount of the partition 16 provided, so that the spacer 1 can be made to have the annular groove S while maintaining the function as the spacer 1 as compared with the spacer 1 without the partition 16. Can be big. As described above, the size of the annular groove S, that is, the width and the depth, is adjusted according to various characteristics of the grease (soft, hard, etc.).
It can be arbitrarily set to select the optimum grease storage amount.

Another embodiment of the present invention will be described below. The configuration of each of the following embodiments is the same as that of FIG. 1 except for the points described in detail, and thus the same portions are denoted by the same reference numerals and the description thereof will be omitted. First, the annular groove S may not be divided into two by the partition wall 16 as described above.
As shown in FIG. 1, the bearing inner spaces 43, 5 of the rolling bearings 4, 5 on both sides are passed from one annular groove S through the pores 17, 18.
3 may be configured to supply grease.

The paths for supplying the grease from the annular groove S to the bearing inner spaces 43, 53 are defined by the fine holes 17, 18 described above.
However, as shown in FIGS. 3 (a) and 3 (b), for example, as shown in FIGS. 3 (a) and 3 (b), both end faces 1a and 1b of the spacer 1 facing the rolling bearings 4 and 5 are formed.
A plurality of grooves 1c arranged radially on the outer peripheral surface 1 of the spacer 1
It is also possible to form a plurality of grooves 1e, which are connected to the plurality of grooves 1c and are arranged in parallel with the axial direction and reach the annular groove S, at d.

Next, the embodiment shown in FIG. 4 will be described. The embodiment of FIG. 4 has the same overall configuration as that of FIG. 1, but the rib-shaped partition walls 11 and 12 connecting the body portion 13 and the contact portions 11 and 12 among them are the rolling bearings 4. The difference is that it is a thin-walled portion for pressurizing 5. In the figure, reference numerals 13a and 13b are annular grooves formed on the outer peripheral surface of the body portion 13 in order to assist the movement of the partition walls 11 and 12 as a thin portion.

As described above, when the partition walls 11 and 12 are made to function as the thin-walled portions for pressurizing the rolling bearings 4 and 5, the rolling bearings 4 and 5 can be pressurized at a constant pressure and can be pressurized at a fixed position. Unlike the spacer 1, there is no possibility that the pressurization will change depending on the temperature, and the pressurization will be constant. As well,
As in the case where a constant pressure is applied by a spring member that is separate from the spacer 1, there is no risk that the spring member will be displaced or fall off, making it impossible to perform constant pressurization, and the spring member that is separate from the spacer 1 Compared to the case of using the bearing device housing 3
Incorporation into the product is also improved.

The spacer for the rolling bearing of the present invention is not limited to that of each of the embodiments described above. For example, since the spacers in each of the above embodiments are incorporated in a bearing device of a type in which the rotary shaft 2 and the housing 3 are combined, the housing 3 and the rolling bearing 4 of the pair of spacers 1 and 6 are included. , 5 in the spacer 1 on the side in contact with the outer rings 42, 52, the annular groove S and the paths 17, 18, 1c, 1e.
However, when it is incorporated in a bearing device of a type in which a fixed shaft and a rotary sleeve are combined, conversely, the annular groove or the path is formed in the spacer which abuts the inner ring of the fixed shaft or the rolling bearing. Should be provided.

Besides, various design changes can be made without departing from the scope of the present invention.

[0024]

As described above in detail, the spacer for the rolling bearing of the present invention is provided with the annular groove which is isolated from the bearing inner space, and from this annular groove, the bearing inner space of the rolling bearing is formed. Since it has a route to gradually supply grease to the grease, the grease is stable even when the spacer width is wide, or when it is used in a bearing device of equipment subject to vibration or acceleration G, such as aircraft and automobiles. It can be held and supplied.

Further, the annular groove is formed by a partition wall in the axial direction.
In the case of division, it is possible to prevent uneven distribution of grease in the annular groove, and to not only supply grease evenly to the rolling bearings on both sides of the spacer, but also to make one of the paths on both sides air. It also prevents the grease from being blown out from the other path. Moreover, when the partition wall is provided, the rigidity is increased accordingly, and there is also an advantage that the annular groove can be made larger while maintaining the function as a spacer.

Further, when the spacer has a thin portion for pressurizing the rolling bearing on the side wall portions on both sides of the annular groove which are in contact with the stationary side bearing ring, the rolling bearings on both sides should be pressurized at a constant pressure. Therefore, unlike the fixed-position pressurizing spacer, the pressurizing force does not change depending on the temperature, and the pressurizing force is constant. Moreover, as in the case where a constant pressure is applied by a spring member separate from the spacer, the spring member is displaced or falls off,
There is no fear that steady pressurization will not be possible, and the ease of installation in the bearing device will be improved.

[Brief description of drawings]

FIG. 1 (a) is an enlarged sectional view showing a state in which an embodiment of a spacer for a rolling bearing of the present invention is incorporated in a bearing device,
FIG. 2B is a sectional view showing the entire bearing device incorporating the spacer of the above embodiment.

FIG. 2 shows another embodiment of a spacer for a rolling bearing according to the present invention,
It is an expanded sectional view showing the state where it was built into a bearing device.

FIG. 3 (a) is an enlarged cross-sectional view showing a state in which another embodiment of the spacer for a rolling bearing of the present invention is incorporated in a bearing device, and FIG. 3 (b) shows the above embodiment. It is a partial expansion perspective view which shows the characteristic part of a spacer.

FIG. 4 is an enlarged cross-sectional view showing still another embodiment of the spacer for a rolling bearing according to the present invention, which is incorporated into a bearing device.

FIG. 5 is an enlarged cross-sectional view showing a state in which a conventional rolling bearing spacer is incorporated in a bearing device.

[Explanation of sign]

 1 Spacer 11,12 Contact part 13 Body part 14,15 Partition wall 16 Partition wall 17,18 Pore (path) 1c, 1e Groove (path) S Annular groove 2 Rotation shaft 3 Housing 4,5 Rolling bearing 41,51 Inner ring 42,52 Outer ring 43,53 Bearing inner space 6 Spacer

Claims (3)

[Claims] 1. A spacer for a rolling bearing, which is interposed between rolling bearings on a stationary side of rolling bearings arranged in a state of being separated from each other by a predetermined distance in the axial direction, and which is stationary. It has an annular groove that forms a space for holding grease, which is isolated from the bearing inner space, with the member on the side, and supplies grease that connects this annular groove and the bearing inner spaces of the rolling bearings on both sides. A spacer for a rolling bearing characterized by having a path of. 2. The spacer for a rolling bearing according to claim 1, wherein the annular groove is axially divided into two by a partition wall. 3. The spacer for a rolling bearing according to claim 1, wherein thin-walled portions for pressurizing the rolling bearing are formed on side wall portions on both sides of the annular groove, which are in contact with the stationary race ring.