WO2017014235A1

WO2017014235A1 - Full complement roller-type double row cylindrical roller bearing

Info

Publication number: WO2017014235A1
Application number: PCT/JP2016/071270
Authority: WO
Inventors: 阿沙葵眞継
Original assignee: Ntn株式会社
Priority date: 2015-07-22
Filing date: 2016-07-20
Publication date: 2017-01-26
Also published as: JP2017026030A

Abstract

A full complement roller-type double row cylindrical roller bearing is provided with a double row outer ring (6), a double row inner ring (10) and collar rings (11, 12), which are separately made in an integrated form. The double row outer ring (6) is made in a shape that has two track surface (3, 4) and a center rib (5) on the inner circumference and in which cylindrical rollers (1, 2) can be disposed in the respective track surfaces (3, 4) from the axial direction. The double row inner ring (10) is made in a shape that has two track surfaces (7, 8) and a center rib (9) on the outer circumference and in which the cylindrical rollers (1, 2) can be disposed in the respective track surfaces (7, 8) from the axial direction. The collar rings (11, 12) are fixed by press-fitting in the double row outer ring (6) and hold one row of the cylindrical rollers (1, 2) in the axial direction.

Description

Full roller type double row cylindrical roller bearing

This invention relates to a full-roller type double row cylindrical roller bearing.

Full-roller type double-row cylindrical roller bearings have two rows of cylindrical rollers and an integrated double-row outer ring with two raceways and a middle brim, without a cage, and maximizing the number of rollers in each row. It is a thing. The inner periphery of the double row outer ring has a shape in which cylindrical rollers can be arranged in the axial direction from the outside of the bearing on each of the two raceway surfaces.

The conventional full-roller type double row cylindrical roller bearing has two integral inner rings each having one raceway surface and flanges on both sides. In the assembly of the bearing, the cylindrical rollers of each row can be temporarily held in a state of being arranged on the raceway surface of the corresponding inner ring, and can be arranged on the raceway surface of the double row outer ring from the axial direction.

These two inner rings are separated from the double-row cylindrical rollers and the double-row outer ring after being inserted into the double-row outer ring together with the cylindrical rollers. As a means of non-separation, two inner rings are connected by attaching an inner ring coupling ring straddling between inner circumferential groove portions of each inner ring by a rolling press process.

¡Installation of inner ring coupling ring by rolling press processing requires a lot of processing steps and requires special equipment. As another non-separating means for avoiding this, by forming two retaining ring grooves on both sides of the inner periphery of the double row outer ring and fitting the retaining ring into each retaining ring groove, It has been proposed that the cylindrical rollers in each row are restricted from both axial directions by means of a retaining ring and that the separation of the two inner rings and the double row outer ring is prevented via the two rows of cylindrical rollers (Patent Document 1 below). ).

In general, the two inner rings are first formed as a single-row double-row inner ring having two raceways, a middle brim, and a brim on both sides, and the double-row inner ring is divided into two at the axial center. Manufactured as a set.

JP-A-11-101228

However, when dividing an integral double row inner ring into two inner rings, a division failure may occur. In particular, when dividing by natural splitting, there is a variation in the cracking method, and division failure tends to occur. The inner ring with poor division is discarded immediately before completion, and the disposal loss is disadvantageous in terms of manufacturing cost.

In addition, the non-separating means using two retaining rings as in Patent Document 1 can avoid mounting the inner ring coupling ring by rolling press processing, but the number of parts is larger than when the inner ring coupling ring is used. End up.

Therefore, the problem to be solved by the present invention is to eliminate the waste loss due to the division failure of the inner ring in the full-roller type double row cylindrical roller bearing, and avoid the mounting of the inner ring coupling ring and the increase in the number of parts by rolling press processing. It is to make it non-separable.

In order to achieve the above object, the present invention has two rows of cylindrical rollers, two raceway surfaces and a middle collar on the inner periphery, and a shape in which the cylindrical rollers can be arranged on each raceway surface from the axial direction. A full-roller type double-row cylindrical roller bearing having an integral double-row outer ring, and having two raceway surfaces and a middle collar on an outer periphery, and at least one of these raceway surfaces has the cylindrical roller And an integral double row inner ring having a shape that can be arranged from the axial direction, and an integral collar ring that is fixed by press-fitting the double row outer ring and supports the row of cylindrical rollers in the axial direction. The configuration is adopted.

According to the above configuration, since the integrated double-row inner ring is provided, the step of dividing the inner ring into two inner rings becomes unnecessary. For this reason, there is no waste loss due to poor division of the inner ring, and it is not necessary to mount the inner ring coupling ring by rolling press processing.
Further, a double-row outer ring having a shape capable of arranging cylindrical rollers from the axial direction on each inner raceway surface and a double-row inner ring having a shape capable of arranging cylindrical rollers from the axial direction on at least one outer raceway surface are provided. Therefore, in the assembly stage before fixing the collar ring, the two rows of cylindrical rollers can be respectively disposed between the corresponding raceway surfaces of the double row outer ring and the double row inner ring. In addition, when the collar ring is fixed to the double row outer ring, it is possible to axially support a row of cylindrical rollers with the collar ring, so that the two rows of cylindrical rollers, the double row outer ring, and the double row inner ring are not separated. The
Since the collar ring is an integral type fixed by press-fitting to the double-row outer ring, it does not require fixing relying on other members such as a retaining ring. For this reason, an increase in the number of parts can be avoided.

As described above, according to the present invention, the adoption of the above configuration eliminates the waste loss due to the division failure of the inner ring in the full-roller type double-row cylindrical roller bearing, and also increases the number of parts and attachment of the inner ring coupling ring by rolling press processing. It can be avoided and non-separated, and as a result, the manufacturing cost can be reduced.

Sectional drawing in the axial plane which shows the full-roller type double row cylindrical roller bearing which concerns on embodiment of this invention Sectional view showing the first reference example Sectional view showing the second reference example

Hereinafter, a full-roller type double row cylindrical roller bearing according to an embodiment of the present invention will be described with reference to FIG. 1 of the accompanying drawings.
As shown in the figure, this full-roller type double row cylindrical roller bearing includes two rows of cylindrical rollers 1 and 2, a double row outer ring 6 having two

raceway surfaces

3 and 4 and a middle collar 5 on the inner periphery, A double-row inner ring 10 having two

raceway surfaces

7 and 8 and a middle collar 9 on the outer periphery, and two

collar rings

11 and 12 fixed to the double-row outer ring 6 are provided. Hereinafter, the direction along the central axis of the double-row inner ring and the double-row outer ring arranged concentrically is simply referred to as the “axial direction”, and the direction perpendicular to the central axis is simply referred to as the “radial direction”. The circumferential direction around the central axis is simply referred to as “circumferential direction”.

Here, the “full roller shape” of the full-roller type double row cylindrical roller bearing means the diameter of the cylindrical rollers 1 and 2 to which the sum of the clearances between the cylindrical rollers 1 and the sum of the clearances between the cylindrical rollers 2 correspond respectively. A bearing without a cage that does not exceed (that is, the number of rollers in each row is maximized).

The double-row outer ring 6 and the double-row inner ring 10 are integrally formed, that is, integrally formed race rings. The inner circumference of the double row outer ring 6 is composed of the entire inner circumference of the raceway ring. The outer periphery of the double-row inner ring 10 is the entire outer periphery of the raceway ring.

The first row of cylindrical rollers 1 is disposed between the first raceway surface 3 of the double row outer ring 6 and the first raceway surface 7 of the double row inner ring 10. The second row cylindrical rollers 2 are disposed between the second raceway surface 4 of the double row outer ring 6 and the second raceway surface 8 of the double row inner ring 10.

The middle brim 5 of the double row outer ring 6 is located between two

raceway surfaces

3 and 4 that are separated from each other in the axial direction, and includes a protrusion having an inner diameter smaller than both

raceway surfaces

3 and 4. The middle collar 9 of the double-row inner ring 10 is located between two

raceway surfaces

7 and 8 that are separated in the axial direction, and includes a protrusion having an outer diameter larger than the

raceway surfaces

7 and 8. These

intermediate collars

5 and 9 support the first row of cylindrical rollers 1 and the second row of cylindrical rollers 2 in the axial direction, respectively.

The double-row outer ring 6 does not have a collar other than the middle collar 5 integrally, and has a shape in which the corresponding rows of cylindrical rollers 1 and 2 can be arranged on the

raceway surfaces

3 and 4 from the axial direction. In the illustrated example, the inner diameter of the double-row outer ring 6 between the first raceway surface 3 and the inner peripheral edge closer to the first raceway surface 3 is set to an inner diameter dimension larger than the raceway surface 3. The circumferential groove 13 is formed. Further, the inner diameter dimension between the second raceway surface 4 and the inner peripheral edge closer to the second raceway surface 4 is set to be larger than the raceway surface 4, and a second circumferential groove 14 is formed therebetween. These

circumferential grooves

13 and 14 are connected in the same groove cross-sectional shape over the entire circumference in the circumferential direction.

On the other hand, the double-row inner ring 10 does not have a collar other than the middle collar 9 integrally, and has a shape in which the cylindrical rollers 1 and 2 corresponding to the

raceway surfaces

7 and 8 can be arranged from the axial direction. In the illustrated example, the outer diameter of the double-row inner ring 10 between the first raceway surface 7 and the outer peripheral edge closer thereto is set to an outer diameter dimension equal to or less than the raceway surface 7, and the second Between the track surface 8 and the outer peripheral edge closer to the track surface 8 is set to have an outer diameter dimension equal to or smaller than the track surface 8.

Of the two

collar rings

11, 12, the first collar ring 11 functions as a collar that axially supports the first row of cylindrical rollers 1 that roll between the

first raceway surfaces

3, 7. The ring 12 functions as a collar that supports the second row of cylindrical rollers 2 rolling between the

second raceway surfaces

4 and 8 in the axial direction. These two

collar rings

11 and 12 are respectively fixed by press-fitting the double row outer ring 6 from the axial direction.

Specifically, each of the two

collar rings

11 and 12 is an integral member, that is, an annular member formed integrally. Further, the two

collar rings

11 and 12 are arranged on the outer

circumferential surfaces

15 and 16 including the

protrusions

15a and 16a press-fitted in the corresponding

circumferential grooves

13 and 14 from the axial direction, respectively, and on the double row inner ring 10 over the entire circumference. And

annular wall surfaces

17 and 18 that are axially opposed to the corresponding rows of cylindrical rollers 1 and 2. These

collar rings

11 and 12 are manufactured separately from the double-row inner ring 10.

After the corresponding rows of cylindrical rollers 1 and 2 are disposed between the

first raceway surfaces

3 and 7 or between the

second raceway surfaces

4 and 8 from the axial direction, the

corresponding collar rings

11 and 12 are connected to the double-row outer ring 6 and the double-row outer ring 6. By arranging coaxially with the inner ring 10 and pushing the outer

circumferential surfaces

15 and 16 axially into the inner circumference of the double row outer ring 6, the

projections

15a and 16a are press-fitted into the corresponding

circumferential grooves

13 and 14, respectively. The annular wall surfaces 17 and 18 are aligned with the double-row inner ring 10 in the axial direction. When the two collar rings 11 and 12 are fixed to the double-row outer ring 6 in this manner, the collar rings 11 and 12 can support the cylindrical rollers 1 and 2 in the corresponding rows in the axial direction. The cylindrical rollers 1 and 2 in the row, the double row outer ring 6 and the double row inner ring 10 are in a non-separated state. That is, during handling of the full-roller type double row cylindrical roller bearing, when the collar rings 11 and 12 receive the weight of the corresponding row of cylindrical rollers 1 and 2 and the double row inner ring 10, the corresponding

protrusions

15a and 16a have corresponding circumferential grooves. By locking the inner circumferences of the

grooves

13 and 14 in the axial direction and the radial direction, the

collars

11 and 12 receiving the weight are fixed.

The width of each of the two outer

peripheral surfaces

15 and 16 is such that the inner ring width of the double-row inner ring 10 is made smaller than the outer ring width of the double-row outer ring 6 due to omission of the collar, and is ½ of the difference between the inner ring width and the outer ring width. Since this is possible, the fitting width between the bearing outer side of the outer

peripheral surfaces

15 and 16 and the inner periphery of the double-row outer ring 6 can be sufficiently obtained. As described above, when the collar rings 11 and 12 receive the weight of the double-row inner ring 10 or the like, the collar rings 11 and 12 tend to tilt toward the outside of the bearing, but the outer

peripheral surfaces

15 and 16 of the collar rings 11 and 12 are. By the fitting with the width between the outer side of the bearing and the inner circumference of the double-row outer ring 6, a supporting effect that resists the inclination behavior is exhibited. For this reason, the situation where the above-mentioned latch is released does not occur easily.

The two side surfaces that define the inner ring width of the double-row inner ring 10 are the alignment points of the annular wall surfaces 17 and 18. The two collar rings 11 and 12 are formed together with the double-row inner ring 10 by abutting against bearing peripheral parts such as a shoulder portion, a spacer, and a housing lid of the shaft supported by the full-roller type double-row cylindrical roller bearing. It is possible to constrain in the direction. Even when the annular wall surfaces 17 and 18 are pushed in the axial direction from the corresponding cylindrical rollers 1 and 2 during the bearing operation, the two collar rings 11 and 12 are fixed to the double-row outer ring 6 and the above-described restraint. Corresponding rows of cylindrical rollers 1 and 2 can be supported in the axial direction. The two collar rings 11 and 12 are set to have the same inner diameter as the double-row inner ring 10.

The full-roller double-row cylindrical roller bearing according to the embodiment is as described above, and includes the integral double-row inner ring 10. Therefore, the process of dividing into two inner rings is not necessary. For this reason, there is no waste loss due to poor division of the inner ring, and it is not necessary to mount the inner ring coupling ring by rolling press processing.

Further, the full-roller type double row cylindrical roller bearing according to the embodiment includes a double row outer ring 6 having a shape in which cylindrical rollers 1 and 2 in a corresponding row can be arranged in the axial direction on the raceway surfaces 3 and 4 on the inner circumference, and an outer circumference. Are provided with a double row inner ring 10 having a shape in which the corresponding cylindrical rollers 1 and 2 can be arranged from the axial direction. Therefore, in the assembly stage before fixing the collar ring, the two rows of cylindrical rollers 1 and 2 are provided. 2 can be arranged between the corresponding

first raceway surfaces

3 and 7 and between the second raceway surfaces 4 and 8, respectively.

Moreover, the full-roller type double row cylindrical roller bearing according to the embodiment includes a first collar ring 11 that supports the first row of cylindrical rollers 1 disposed between the

first raceway surfaces

3 and 7 in the axial direction, and a second collar ring. Since the second collar ring 12 supporting the second row of cylindrical rollers 2 disposed between the raceway surfaces 4 and 8 in the axial direction is provided, when these two collar rings 11 and 12 are fixed to the double-row outer ring 6, Since each

cylindrical ring

11 and 12 can support the corresponding rows of cylindrical rollers 1 and 2 in the axial direction, the two rows of cylindrical rollers 1 and 2, the double row outer ring 6, and the double row inner ring 10 are not separated. be able to.

Further, the full-roller type double row cylindrical roller bearing according to the embodiment includes the integral collar rings 11 and 12 fixed by press-fitting to the double row outer ring 6, so that fixing depending on other members such as a retaining ring is possible. It is not necessary and an increase in the number of parts can be avoided.

For example, when the collar ring is fixed using a retaining ring, the retaining

ring grooves

22 and 23 of the double row outer ring 21 and the retaining rings of the corresponding collar rings 24 and 25 are shown in FIG. Corresponding retaining rings 28 and 29 fitted into the

grooves

26 and 27 are required. On the other hand, in the full-roller type double-row cylindrical roller bearing according to the embodiment, as shown in FIG. 1, no retaining ring is required for fixing the collar rings 11 and 12 to the double-row outer ring 6, and parts required for non-separation The score can be reduced.

Also, in the conventional example in which the two inner rings are connected by the inner ring coupling ring, in addition to the two rows of cylindrical rollers and the double row outer ring, three points of the two inner rings and the inner ring coupling ring are necessary for non-separation. In contrast, in the full-roller type double row cylindrical roller bearing according to the embodiment, as shown in FIG. 1, in addition to the two rows of cylindrical rollers 1 and 2 and the double row outer ring 6, one double row inner ring 10 and Since the three

collars

11 and 12 are not separated, the number of parts does not increase.

In addition, in the full-roller type double row cylindrical roller bearing according to the embodiment, two collar rings are adopted, but instead of either one of the collar rings, a collar corresponding to the double row inner ring is formed, and the collar ring is 1 It is possible to have only one. In this case, temporarily hold one row of cylindrical rollers in a state where they are arranged on the raceway between the collars of the double row inner ring and the middle brim, and after placing them on the raceway of the double row outer ring from the axial direction, By disposing between the corresponding raceway surfaces and fixing the collar ring to the double-row outer ring, non-separation can be achieved. If it is important to reduce the number of parts, it is sufficient to use only one collar ring. If importance is attached to the assembly property that does not require temporary holding as described above, two collar rings are used as in this embodiment. That's fine.

Further, in the full-roller type double row cylindrical roller bearing according to the embodiment,

circumferential grooves

13 and 14 are formed on the inner circumference of the double row outer ring 6, and the collar rings 11 and 12 are press-fitted into the

circumferential grooves

13 and 14. Outer

circumferential surfaces

15 and 16 including the

projections

15a and 16a, and annular wall surfaces 17 and 18 that are axially aligned with the double row inner ring 10 over the entire circumference in the circumferential direction and are opposed to the row of cylindrical rollers 1 and 2 in the axial direction. Therefore, the

flanges

11 and 12 can prevent foreign matter from entering the bearing. For this reason, the collar rings 11 and 12 can be used as a seal, which is also advantageous for preventing an increase in the number of parts.

For example, when a seal is provided, as shown in a second reference example in FIG. 3, the

seals

38, 33 corresponding to the

seal grooves

32, 33 of the double row outer ring 31 and the

seal grooves

36, 37 of the corresponding collar rings 34, 35 are provided. By fitting 39, it is possible to use both a retaining ring and a seal, but one seal is still required to fix one collar ring. Therefore, the full roller type double row cylindrical roller bearing according to the embodiment can reduce the number of parts required for non-separation.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. Accordingly, the scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1, 2

Cylindrical rollers

3, 4, 7, 8

Raceway surface

5, 9 Middle collar 6 Double row outer ring 10 Double row

inner ring

11, 12

Brim ring

13, 14

Circumferential groove

15, 16

Outer circumferential surface

15a,

16a Protrusion

17, 18 Annular Wall

Claims

Two rows of cylindrical rollers (1, 2);
There are two raceway surfaces (3, 4) and a middle collar (5) on the inner circumference, and each raceway surface (3, 4) has a shape that allows the cylindrical rollers (1, 2) to be arranged from the axial direction. An integrated double row outer ring (6),
In a full-roller type double row cylindrical roller bearing comprising:
There are two raceway surfaces (7, 8) and a middle collar (9) on the outer circumference, and the cylindrical rollers (1, 2) can be arranged in the axial direction on at least one of these raceway surfaces (7, 8) An integrated double row inner ring (10) having a unique shape,
An integral collar ring (11, 12) fixed by press-fitting into the double row outer ring (6) and supporting the cylindrical roller (1, 2) in a row in the axial direction is further provided. Full roller type double row cylindrical roller bearing.
Circumferential grooves (13, 14) are formed on the inner periphery of the double-row outer ring (6),
The collar ring (11, 12) is formed on the outer peripheral surface (15, 16) including the protrusion (15a, 16a) press-fitted in the circumferential groove (13, 14) from the axial direction, and on the double row inner ring (10). The full-roller double-row cylinder according to claim 1, further comprising an annular wall surface (17, 18) that is axially aligned with the entire circumferential circumference and has an annular wall surface (17, 18) opposed to the row of cylindrical rollers (1, 2) in the axial direction. Roller bearing.