JPH0544720A - Angular contact cylindrical roller bearing - Google Patents

Abstract

PURPOSE:To improve rigidity and load capacity in an angular contact cylindrical roller bearing for an industrial robot and the like by forming two rows of roller rolling raceway tracks having cylindrical rollers and separators in parallel with the radial direction between an inner race and an outer race so that the lines of action of rolling body load of the cylindrical rollers are crossed each other. CONSTITUTION:Two rows of roller rolling raceway tracks 5, 6 are formed between the outer circumferential face 2 of an inner race 1 and the inner circumferential face 4 of an outer race 3 at an interval in the axial direction 0-0 and in parallel with the radial direction. Cylindrical rollers 7, 8 are respectively arranged on the roller rolling raceway tracks 5, 6, along the raceway track faces 11, 12 of the raceway track grooves 9, 10 and the raceway track faces 15, 16 of the raceway track grooves 13, 14 of the outer race 3, the rollers are rolled under a decided pre-load or clearance, and the lines of action X1, X2 of the rolling body load are arranged to be crossed inside the pitch circle of the rollers 7, 8. Separators 35 are mounted between the adjoining rollers 7, 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to industrial robots, machine tools, medical devices, etc., and is used for turning parts. It relates to an angular contact cylindrical roller bearing arranged in between.

[0002]

2. Description of the Related Art As a cylindrical roller bearing of this type, as shown in FIG. 7, a cylindrical roller C is provided between an outer ring A and an inner ring B, and rollers C and D are shown in FIG. , A so-called cross roller bearing structure is adopted in which the axes E and F are arranged in one row by alternately crossing adjacent rollers.

Since the conventional cross roller bearing shown in FIG. 7 has a single row of rollers, it has a limit in rigidity and load capacity with respect to dimensions, and further higher rigidity and higher load capacity are desired. It is rare.

In the cross roller bearing shown in FIG. 7, a hole G into which the rollers C and D can be inserted is formed in a part of the outer peripheral surface of the outer ring A, and one roller C and D is inserted from this hole G. They are then inserted into the rolling groove formed by the outer ring A and the inner ring B, and when the insertion of all the rollers is completed, the hole G is closed by the plug H.

[0005]

SUMMARY OF THE INVENTION The present invention can increase the bearing width, but can increase the load capacity with significantly higher rigidity than the conventional one without increasing the bearing outer diameter. An object of the present invention is to provide an angular contact cylindrical roller bearing which can easily cope with a case where rigidity is required.

[0006]

In order to solve the above-mentioned problems, an angular contact cylindrical roller bearing has two rows of rollers with an axial gap between an inner ring and an outer ring. Rolling raceways are formed parallel to each other in the circumferential direction. Cylindrical rollers and separators are arranged in both roller rolling raceways and are arranged so that the lines of action of rolling element loads of two rows of cylindrical rollers intersect. I made it a structure.

According to the second aspect of the present invention, in the two-row roller rolling raceway, the distance between the central portions of the outer ring side raceway surfaces is made larger than the distance between the central portions of the inner ring side raceway surfaces, and the rolling elements are formed. The intersection of the load action lines is located inside the roller pitch circle.

According to the third aspect of the present invention, in the two-row roller rolling raceway, the distance between the central portions of the inner ring side raceway surfaces is set to be greater than the distance between the central portions of the outer ring side raceway surfaces, and the rolling motion is performed. The intersection of the action lines of the dynamic body load is outside the pitch circle of the rollers.

[0009]

According to the invention of claim 1, since two rows of rollers are provided, the radial load,
Load capacity for axial load and moment load
Rigidity is increased, and in terms of dimensions, it is sufficient to increase the bearing width, and the characteristics of small size and high performance can be maintained as in the conventional products.

According to the second aspect of the present invention, since it is loaded by two rows of rollers, it is about twice as large as the radial load and the axial load as compared with the conventional cross roller bearing, and is larger than the moment load. Have load capacity,
The rigidity is also improved. Further, according to the invention of claim 3, the radial load and the axial load are about the same as those of claim 2, but the load capacity is larger than the moment load.

[0011]

1 is a half-vertical longitudinal sectional view parallel to the axis of an embodiment of the invention of claims 1 and 2, showing an outer peripheral surface 2 of an inner ring 1 and an inner peripheral surface 4 of an outer ring 3. Two rows of roller rolling tracks 5 and 6 are formed therebetween.

The roller rolling raceways 5 and 6 are formed in parallel with each other at intervals in the axial direction OO and in the circumferential direction.

Rollers 7, which roll on both roller rolling paths 5 and 6,
Reference numeral 8 rolls along the raceway surfaces 11 and 12 of the raceway grooves 9 and 10 of the inner ring 1 and the raceway surfaces 15 and 16 of the raceway grooves 13 and 14 of the outer ring 3 under a predetermined preload or clearance, but they are adjacent to each other. A separator 35 described below is interposed between each of the rollers 7 and 8.

The distance between the central portions of the raceway surfaces 15 and 16 of the outer ring 3 is set larger than the distance between the central portions of the raceway surfaces 11 and 12 of the inner ring 1.

The line of action X of the rolling element load on the rollers 7, 8
1 and X2 intersect inside the pitch circles of the rollers 7 and 8, and have high load capacity and rigidity with respect to moment load. In the example shown in FIG. 1, this intersecting angle is set to about 90 degrees. However, the angle is not limited to 90 degrees.

In the angular contact cylindrical roller bearing shown in FIG. 1, the inner ring 1 is divided into an outer ring 1-1, an intermediate ring 1-2 and an outer ring 1-3, and a bolt / nut 1- 4 and the like, and they are assembled together in the process shown in FIGS. 2 and 3.

That is, as shown in FIG. 2, the outer ring 3
Insert the seal ring 36 and the outer ring 1-1 into the
All the rollers 8 and the separators 35 are fitted, and then, as shown in FIG. 3, the intermediate wheels 1-2 are fitted to prevent the rollers 8 and the separators 35 from coming off.

Then, all the rollers 7 and the separators 35 are fitted between the outer ring 3 and the intermediate wheels 1-2, then the seal ring 36 and the outer rings 1-3 are fitted, and as shown in FIG. It is assembled in the process of fixing the three together with nuts 1-4.

Of course, the inner ring 1 may be integrally formed and the outer ring 3 may be divided.

FIG. 4 is a half-vertical longitudinal sectional view similar to FIG. 1 showing an embodiment of the invention of claims 1 and 3, wherein two rows of roller rolling are provided between the inner ring 17 and the outer ring 18. Orbit 19,2
It is the same as the embodiment shown in FIG. 1 that 0s are formed at intervals.

In this embodiment, the rollers 21 and 22 are
Rolls along the raceway surfaces 25, 26 of the raceway grooves 23, 24 of the inner ring 17 and the raceway surfaces 29, 30 of the raceway grooves 27, 28 of the outer ring 18 under a predetermined preload or clearance, but the adjacent rollers 21 , 22 between each of the separators 3 described later.
5 is installed.

In FIG. 4, raceway surfaces 25 and 2 of the inner ring 17 are shown.
The distance between the central portions of 6 is larger than the distance between the central portions of the raceway surfaces 29, 30 of the outer ring 18.

In this embodiment, the lines of action Y1 and Y2 of the rolling element loads of the rollers 21 and 22 intersect outside the pitch circles of the rollers 21 and 22, so that the load capacity and rigidity against radial load, axial load and moment load. Is larger than that shown in FIG. 1, and the action line Y in the illustrated example is
The intersection angle of 1 and Y2 is about 90 degrees, but the intersection angle is not limited to 90 degrees.

In the embodiment shown in FIGS. 1 and 4, the inner ring is divided into three parts, but the outer ring may be divided into three parts, and the inner ring may have an integral structure. Further, as shown in FIG. Partly, rollers 38, 39 and separators 40, 41
Is formed in the rolling raceways 42 and 43 of the roller, and the rollers 38 and 39 and the separator 4 are inserted from the hole 44.
It is also possible to fit all of 0 and 41, and after the fitting is completed, the hole 44 may be closed by the plug 45.
May be formed in the inner ring 46, and the roller and the separator may be fitted from the inner ring 46 side.

In the present invention, as shown in FIGS. 1, 4 and 5, each two rows of roller rolling raceways are formed in parallel with each other at intervals in the axial direction and in the circumferential direction. It is possible to form the oil holes 33 and 34 by utilizing this gap portion.

The separators 35, 40 and 41 shown in FIGS. 1, 4 and 5 have the structure shown in FIG. 6 and are separators for cylindrical rollers, so that the concavities 47, which are conical cylindrical surfaces, are formed on both sides. 48 are formed.

[0027]

According to the invention of claim 1, it is possible to increase the rigidity and increase the load capacity of the angular contact cylindrical roller bearing without increasing the outer diameter of the bearing, only by increasing the bearing width. ..

According to the invention of claim 2, the radial load,
It has an effect of maintaining high rigidity against axial load and moment load.

According to the third aspect of the present invention, the load capacity of radial load and axial load is increased, and the load capacity and rigidity against moment load can be significantly increased.

Therefore, according to the present invention, by selecting the raceway surface on which the rollers roll, a high load capacity that meets the usage conditions can be obtained.
A highly rigid angular contact cylindrical roller bearing can be obtained.

[0031]

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an example of an embodiment of the present invention.

FIG. 2 is a half-vertical longitudinal sectional view showing a first step of assembling the angular contact cylindrical roller bearing shown in FIG.

3 is a half-vertical longitudinal sectional view showing a second step of assembling the angular contact cylindrical roller bearing shown in FIG.

FIG. 4 is a vertical cross-sectional view of an example of an embodiment of the present invention.

FIG. 5 is a half-vertical cross-sectional view of a different embodiment of the roller and separator fitting means.

FIG. 6 is an enlarged perspective view of the separator.

FIG. 7 is a vertical cross-sectional view of an example of a conventional angular contact cylindrical roller bearing.

[Explanation of symbols]

 1,17 Inner ring 3,18 Outer ring 5,6,19,20 Rolling raceway 7,8,21,22 Roller 9,10,23,24 Inner ring raceway groove 11,12,29,30 Raceway surface 13,14 , 27, 28 Outer ring raceway groove 15, 16, 25, 26 Raceway surface

Claims (3)

[Claims] 1. Two rows of roller rolling raceways are formed parallel to each other in the circumferential direction between the inner ring and the outer ring with a gap in the axial direction. An angular contact cylindrical roller bearing that has rollers and a separator and is arranged so that the lines of action of the rolling element loads of the two rows of cylindrical rollers intersect. 2. In a two-row roller rolling raceway, the distance between the central portions of the raceway surfaces on the outer ring side is greater than the distance between the central portions of the raceway surface on the inner ring side, and the line of action of the rolling element load. 2. The double-row angular contact cylindrical roller bearing according to claim 1, wherein the intersection of the two is inside the roller pitch circle. 3. In a two-row roller rolling raceway, the distance between the central portions of the raceway surfaces on the inner ring side is made larger than the distance between the central portions of the raceway surface on the outer ring side, and the line of action of the rolling element load. 2. The double-row angular contact cylindrical roller bearing according to claim 1, wherein the intersection point is outside the pitch circle of the rollers.