JP3032054B2 - Angular contact cylindrical roller 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 cylindrical roller, which is used for a swiveling part of an industrial robot, various machine tools, various medical devices, and the like, so that the rolling lines of the cylindrical roller cross inside and outside. The present invention relates to an angular contact cylindrical roller bearing arranged between wheels.

[0002]

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

In the conventional cross roller bearing shown in FIG. 7, since one row of rollers is used, rigidity with respect to dimensions and load capacity are limited, 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 rollers C and D can be inserted is formed in a part of the outer peripheral surface of an outer ring A, and one roller C and D is formed from the hole G. Each is inserted into a rolling groove formed by the outer ring A and the inner ring B, and is assembled by means for closing the hole G with the plug H when the insertion of all rollers is completed.

[0005]

According to the present invention, although the bearing width is increased, it is possible to increase the load capacity with a significantly higher rigidity than the conventional one without increasing the outer diameter of the bearing. An object of the present invention is to provide an angular contact cylindrical roller bearing that can easily cope with a case where rigidity is required.

[0006]

According to the first aspect of the present invention, there is provided
To solve the problem, angular contact cylindrical roller shaft
The bearings have a V-shaped cross section on the outer circumference with an interval in the axial direction.
Inner races with rows of raceway grooves, and
An outer ring having two rows of raceways formed on the inner periphery thereof;
Between the orbital grooves formed in parallel in the circumferential direction
A plurality of cylindrical rollers rolling on a roller rolling track;
Adjacent to and interposed between each of the cylindrical rollers in the motion trajectory
Separators for separating and aligning the cylindrical rollers
And a configuration having

Further, the two rows of roller rolling trajectories are each
Only the conical surface on one side of the raceway groove is rolled by the cylindrical roller.
Formed on the moving raceway surface and in front of the raceway surface of the inner race.
A rolling element of the cylindrical roller facing the raceway surface of the outer ring
Angi when the line of action of the load is in one direction pointing to the same point
And the tracks of each other contact each other.
The distance between the center portions of the raceways of the outer ring facing each other is
Formed larger than the distance between the center parts of the raceways of the inner ring
The line of action of the rolling element load on the track is the pitch of the cylindrical roller.
H. The crossing is made on the inner diameter side from the circle diameter.
The rotor is located on both sides facing the adjacent cylindrical rollers.
The recesses in the conical cylindrical surface into which the cylindrical rollers fit are formed symmetrically.
Configuration.

[0008] According to the second aspect of the present invention, there is an interval in the axial direction.
With two rows of orbital grooves having a V-shaped cross section on the outer circumference
A ring and a track having an inverted V-shaped cross section facing each of the track grooves
Parallel between the outer ring with grooves formed on the inner circumference and the raceway grooves
Rolling on two rows of roller rolling orbits formed in the circumferential direction
A number of cylindrical rollers and each of said
Separated between adjacent cylindrical rollers inserted between cylindrical rollers
With separator for aligning and aligning
A Ntakuto cylindrical roller bearings, Utatedo軌Ro this the two rows
Each of the roads has only one conical surface on one side of the raceway groove.
Formed on the rolling raceway of the cylindrical roller and in front of the inner ring
The raceway surface and the raceway surface of the outer ring face each other and
In one direction where the action line of the rolling element load of the roller points to the same point
Orbits of angular contacts
The track is opposed to a center portion of the track surface of the inner race.
The distance is larger than the distance between the center parts of the raceways of the outer ring.
The line of action of the rolling element load of the track formed is the cylinder
It crosses on the outer diameter side from the pitch circle diameter of the rollers,
The separator is provided on both sides facing the adjacent cylindrical rollers.
The concave of the conical cylindrical surface into which the cylindrical roller fits is shaped symmetrically
The configuration has been adopted.

[0009]

According to the first aspect of the present invention, since two rows of cylindrical rollers are provided, the load capacity and rigidity with respect to a radial load, an axial load and a moment load are increased as compared with a conventional single row. Dimensionally, only an increase in the bearing width is sufficient, and the characteristics of small size and high performance can be maintained as in the conventional product.

In addition , since the load is applied by two rows of cylindrical rollers,
Compared with the conventional cross roller bearing, the bearing has about twice the radial load and the axial load, has a large load capacity against the moment load, and has improved rigidity.
The recesses on the conical cylinder surface where the cylindrical rollers fit into both sides are symmetrical.
By inserting the formed separator between cylindrical rollers
The cylindrical rollers are aligned and smooth rotation is possible.
You.

Further , in both the first and second aspects of the present invention,
Indicates that the action line of the rolling element load on the track
Crossed on the inner diameter side of the pitch circle diameter of the cylindrical roller
Crossed on the outside diameter side of the pitch circle diameter of the cylindrical roller
The load capacity of the moment load according to the application.
It can be selected in advance.

[0012]

DETAILED DESCRIPTION FIG. 1 is a half-cut longitudinal sectional view parallel to an example of the axis of the practice of the invention of claim 1, it is rotating ring or fixed ring
That the outer peripheral surface 2 a periphery of the inner ring 1, the fixed ring relative to the inner ring
Alternatively , two rows of roller rolling tracks 5 and 6 are formed between the outer ring 3 and the inner peripheral surface 4 which is the inner circumference of the rotating wheel .

The roller rolling tracks 5 and 6 are spaced from each other in the axial direction OO and are formed in parallel with the circumferential direction.

Cylindrical rollers 7, 8 for rolling the two roller rolling tracks 5, 6 are pieces of track grooves 9 , 10 of the inner ring 1 having a V-shaped cross section.
Raceways 11, 12 in which only the conical surface on the side is the raceway
And one of the raceway grooves 13 and 14 of the outer race 3 having an inverted V-shaped cross section.
Raceway surfaces 15, 16 in which only the conical surface on the side is the raceway surface
, And rolls under a predetermined preload or clearance, and a separator 35 described later is interposed between each of the adjacent cylindrical rollers 7 and 8. Therefore, double roller rolling trajectory
5 and 6 are the product of rolling element load of cylindrical rollers 7 and 8, respectively.
Angi consisting of lines X1 and X2 in one direction pointing to the same point
It is the orbit of the contact.

The distance between the central portions of the raceways 15, 16 of the outer ring 3 is larger than the distance between the central portions of the raceways 11, 12 of the inner race 1.

Line of action X of rolling element load on cylindrical rollers 7 and 8
1, X2 may intersect at an inner diameter side of the pitch circle diameter of the cylindrical roller 7,8, load capacity and rigidity against moment load as compared with conventional products has become larger. In the example shown in FIG. 1, the intersection angle is set to about 90 degrees, but 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 wheel 1-1, an intermediate wheel 1-2, and an outer wheel 1-3. 4 and the like, and are assembled in the steps shown in FIGS.

That is, as shown in FIG.
The seal ring 36 and the outer wheel 1-1 are fitted into
The entire number of cylindrical rollers 8 and separators 35 are fitted, and then, as shown in FIG. 3, the intermediate wheel 1-2 is fitted to prevent the cylindrical rollers 8 and separator 35 from coming off.

Next, all of the cylindrical rollers 7 and the separators 35 are fitted between the outer ring 3 and the intermediate wheel 1-2, and then the seal ring 36 and the outer ring 1-3 are fitted. As shown, it is assembled in a process of integrally fixing the three with bolts and nuts 1-4.

Of course, the inner race 1 may be of an integral structure and the outer race 3 may be divided.

FIG. 4 is a half cross-sectional view similar to FIG. 1 showing an embodiment of the second aspect of the present invention, wherein two rows of roller rolling tracks 19, 20 are provided between an inner ring 17 and an outer ring 18. However, it is the same as the embodiment shown in FIG.

In this embodiment, cylindrical rollers 21 and 22 are used.
Are the raceway surfaces 25, 26 of the raceway grooves 23, 24 of the inner ring 17
And rolling under a predetermined preload or clearance along the raceway surfaces 29, 30 of the raceway grooves 27, 28 of the outer race 18, but a separator 35 described later is provided between each of the adjacent cylindrical rollers 21, 22. It is interposed.

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

[0024] In this embodiment, since the line of action Y1, Y2 of the rolling element load of cylindrical rollers 21 and 22 intersect at the outside of the pitch circle diameter of the cylindrical roller 21 and 22, the load capacity with respect to the inner ring side of the moment load is It has become a larger than those shown in Figure 1
You. Therefore, it can be used properly depending on the application.
In the illustrated example, the intersection angle between the action lines Y1 and Y2 is about 90.
Although it is described as degrees, the intersection angle is not limited to 90 degrees.

In the embodiments shown in FIGS. 1 and 4 in each of the first and second aspects of the present invention , the inner ring is divided into three parts. However, the outer ring may be divided into three parts and the inner ring may have an integral structure.
Also as shown in FIG. 5, a portion of the outer peripheral surface of the outer ring 37, the circle
A hole 44 for fitting the cylindrical rollers 38, 39 and the separator 40, 41 in this filtrate rolling track 42 and 43 drilled, fit the total number of the cylindrical rollers 38, 39 and the separator 40, 41 from the hole 44, After the fitting is completed, the hole 44 may be closed with a plug 45.
And the cylindrical 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 orbits are formed at intervals in the axial direction and parallel to the circumferential direction. The oil holes 33 and 34 can be formed using the space between the central portions which are the space portions.

[0027] Figure 1, a separator 35,40,41 shown in Figures 4 and 5 has a structure shown in FIG. 6, the roller
Adjacent and interposed between each cylindrical roller in the rolling track
This is a separator for separating and aligning cylindrical rollers.
This allows the cylinders on both sides to face the adjacent cylindrical rollers
The recesses 47, 48 of the conical cylinder surface into which the rollers fit are formed symmetrically .

[0028]

[Effect of the Invention] Ri by the invention of claim 1, only increases the bearing width, without involving an increase in the bearing outer diameter, the rigidity of the angular contact cylindrical roller bearing, the effect that can increase the load capacity Play.

Further achieve the Ri by the invention of claim 1, the radial load, can maintain high rigidity against the axial load and moment load effect.

[0030] Ri by the invention of claim 2, together with the loading capacity of radial load and axial load increases, the effect of even load capacity and rigidity against moment load can remarkably large.

Further , both the first and second aspects of the present invention
The recesses in the conical cylindrical surface into which the cylindrical rollers fit are formed symmetrically.
By placing the separator between the cylindrical rollers,
The cylinders 23 are aligned and smooth rotation is possible.

Further, according to the first and second aspects of the present invention,
Ri, by selecting the raceway surface of the rolling of the cylindrical rollers, can be obtained angular contact cylindrical roller bearing a high load capacity and high rigidity that meet the conditions of use.

[Brief description of the drawings]

FIG. 1 is a half sectional vertical sectional view of an embodiment of the present invention.

FIG. 2 is a half vertical sectional view showing a first step of assembling the angular contact cylindrical roller bearing shown in FIG. 1;

FIG. 3 is a half-sectional longitudinal sectional view showing a second step of assembling the angular contact cylindrical roller bearing shown in FIG. 1;

FIG. 4 is a half sectional vertical sectional view of an embodiment of the invention of claim 2;

FIG. 5 is a half sectional view showing a cylindrical roller and a separator incorporating means according to another embodiment of the present invention.

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

FIG. 7 is a longitudinal 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 Roller rolling track 7,8,21,22 Cylindrical roller 9,10,23,24 Track groove of inner ring 11,12,29,30 Track surface 13, 14, 27, 28 Track groove of outer ring 15, 16, 25, 26 Track surface

Claims (2)

(57) [Claims] 1. A V-shaped cross section on the outer periphery with an interval in the axial direction
Inner races formed with two rows of raceway grooves, and each of the raceway grooves
A track groove having an inverted V-shaped cross section is formed on the inner periphery so as to face the
Formed in the circumferential direction in parallel between the outer ring and the raceway groove.
A plurality of cylindrical rollers rolling on two rows of rolling rollers
Between each of said cylindrical rollers in the roller rolling orbit.
To separate and align adjacent cylindrical rollers
Angular contact cylindrical roller shaft with separator
And the two rows of roller rolling trajectories are respectively
Only the conical surface on one side of the raceway groove rolls on the cylindrical roller
The raceway surface of the inner race and the outer race formed on the raceway surface
Of the rolling element load of the cylindrical roller facing the raceway surface of
Angularco whose action line is in one direction pointing to the same point
Contact trajectory, and said trajectory
The distance between the center portions of the raceways of the outer ring is
The track formed larger than the distance between the center portions of the track surfaces
The action line of the rolling element load is the pitch circle diameter of the cylindrical roller.
More intersecting on the inner diameter side, further comprising the separator
Are located on both sides facing the adjacent cylindrical rollers.
The recesses on the conical cylinder surface into which the filter fits are formed symmetrically.
And angular contact cylindrical roller bearings. 2. A V-shaped cross section on the outer periphery with an interval in the axial direction.
Inner races formed with two rows of raceway grooves, and each of the raceway grooves
A track groove having an inverted V-shaped cross section is formed on the inner periphery so as to face the
Formed in the circumferential direction in parallel between the outer ring and the raceway groove.
A plurality of cylindrical rollers rolling on two rows of rolling rollers
Between each of said cylindrical rollers in the roller rolling orbit.
To separate and align adjacent cylindrical rollers
Angular contact cylindrical roller shaft with separator
And the two rows of roller rolling trajectories are respectively
Only the conical surface on one side of the raceway groove rolls on the cylindrical roller
The raceway surface of the inner race and the outer race formed on the raceway surface
Of the rolling element load of the cylindrical roller facing the raceway surface of
Angular control in which the action line is directed to the same point in one direction
Tact trajectory, and the trajectories of each other face each other
The distance between the center portions of the raceway surfaces of the inner ring is in front of the outer ring.
The track is formed to be larger than the distance between the center portions of the track surface.
The line of action of the rolling element load is equal to the pitch circle diameter of the cylindrical roller.
Intersect on the outer diameter side, and the separator further comprises:
The same cylindrical roller is provided on both sides facing the adjacent cylindrical roller.
Make sure that the concave part of the conical cylinder surface to be fitted is formed symmetrically.
Features angular contact cylindrical roller bearings.