JP2513590Y2 - Double row spherical roller bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a double-row spherical roller bearing incorporated in various rotary support parts. In particular, the present invention makes it possible to improve the assemblability of such a double-row spherical roller bearing and to secure the reliability and durability at the same time.

(Prior Art) Conventionally, a seventh part has been provided on a supporting portion such as a rotary shaft of various machines.
As shown in the figure, a double-row spherical roller bearing having a self-centering function is incorporated. This double row spherical roller bearing has an inner ring 2
An idler wheel 3, an outer wheel 5, a plurality of spherical rollers 6, 6,
A plurality of cage-shaped cages 7 and 7 are provided. Inner ring 2 of these
Has concave spherical spherical double-row inner ring raceways 1 and 1 on its outer peripheral surface. The idler wheel 3 is fitted on the outer peripheral surface of the inner ring 2 between the double row inner ring raceways 1, 1. The outer ring 5 has a single concave spherical outer ring raceway 4 on the inner peripheral surface facing the double-row inner raceways 1 and 1. Further, the plurality of spherical rollers 6, 6 are provided with the double-row inner ring raceways 1, 1
And a single outer ring raceway 4 are provided in multiple rows, and a plurality of rows are provided for each row. Further, the plurality of cage-shaped cages 7 and 7 rotatably retain the plurality of spherical rollers 6 and 6 in each row.

These cage-shaped cages 7 and 7 are made, for example, by press-molding a metal plate, and each has a bowl-shaped main body 8 and a radial direction inside from one end edge (edge on the small diameter side) of the main body 8. And a flange 9 formed in a bent state. The main body portion 8 is provided with a plurality of pockets 10 each of which accommodates the spherical roller 6 in a rollable manner in the circumferential direction. Further, the inner peripheral surface of the other end portion of the main body portion 8 is brought into sliding contact with the outer peripheral surface of the idler wheel 3 so as to guide the positioning of the cage retainers 7, 7.

Since the double-row spherical roller bearing is configured as described above, a shaft in which the inner ring 2 is externally fitted and fixed and a housing in which the outer ring 5 is internally fitted and fixed are accompanied by rolling of the plurality of spherical rollers 6, 6. It is possible to freely rotate it relative to etc. Further, since the outer ring raceway 4 has a single concave spherical shape, the plurality of spherical rollers 6, 6 and the inner ring 2 can be displaced with respect to the outer ring 5 in the direction of arrow a in FIG. Therefore, even if the central axis of the shaft or the like is slightly deviated from the central axis of the housing or the like, the inner ring 2 is displaced in the direction of the arrow a to absorb the deviation. Then, it is possible to prevent an unreasonable force from being applied to each of the constituent parts accompanying the operation of the double-row spherical roller bearing.

In order to facilitate the assembling work of the double-row spherical roller bearing configured and acting as described above, it is necessary to prevent the constituent members from being separated from each other and to eliminate the trouble of performing the assembling work. For this purpose, the spherical rollers 6, 6 held inside the pockets 10 of the cage retainers 7, 7 in a state of being arranged around the inner ring raceways 1, 1 come out of the pockets 10 outwardly. You need to make sure you don't.

Therefore, as described in Japanese Utility Model Publication No. 39-1312, for example, elastically deformable locking projections are formed on the edges of each pocket 10, and the locking projections allow spherical surfaces to be formed from the inside of the pocket 10. It is done to prevent the roller 6 from slipping out.

That is, for example, as shown in FIGS. 8 to 9, locking protrusions 12 and 12 projecting inward of the pockets 10 and 10 are provided at the intermediate portions of the pillars 11 and 11 that partition the adjacent pockets 10 and 10. Form.
The distance D between the edges of the locking projections 12, 12 facing each other is
As shown in FIG. 9, the outer diameter R of the spherical roller 6 is slightly smaller (D <R).

When the spherical roller 6 is housed in each pocket 10, 10, the locking projections 12, 12 and the pillars 11, 11 are elastically deformed, and a pair of locking projections 12, 12 facing each other are formed. By increasing the distance, the spherical roller 6 is secured to the pair of locking projections 12,
Pass between twelve. After passing, the above-mentioned pair of locking projections 1
Since the distance between 2 and 12 is restored, the spherical roller 6 held in the pocket 10 will not fall off.

(Problems to be Solved by the Invention) When the spherical rollers 6 are prevented from falling out of the inside of each pocket 10 as described above, the following inconveniences occur.

That is, when the spherical roller 6 is stored inside the pocket 10,
By pushing the locking projections 12, 12 on the outer peripheral surface of the spherical roller 6,
Since the distance between the two locking projections 12, 12 is increased, the rolling surface which is the outer peripheral surface of the spherical roller 6 is easily damaged.

The rolling surface of the spherical roller 6 comes into rolling contact with the inner ring raceways 1, 1 and the outer ring raceway 4 as the double row spherical roller bearing is used.
Therefore, when the rolling surface is damaged, the life of the double row spherical roller bearing is shortened due to damage to the inner ring raceways 1, 1 and the outer ring raceway 4, and the durability and reliability of the double row spherical roller bearing are secured. Cause problems from the aspect.

Further, in the work of forming the locking projections 12 and 12 at the intermediate portions of the pillars 11 and 11, the pockets 10 and 10 are formed by punching and pressing the metal plate that constitutes the cage cage 7. You need to do it later. However, it is unavoidable that the total length (the left and right dimensions in FIG. 8) of each of the pillar portions 11 and 11 is extended due to the work of forming the locking projections 12 and 12. Moreover, the amount of extension of the pillars 11 and 11 accompanying the work of forming the locking protrusions 12 and 12 is
It is difficult to strictly regulate. In other words, since the extension amounts of the pillar portions 11 and 11 are unequal, it becomes difficult to strictly control the inner dimensions of the pockets 10 and 10. As a result, the spherical rollers 6 held inside the pockets 10, 10 are likely to be skewed, and noises are easily generated.

The double-row spherical roller bearing of the present invention eliminates any of the above disadvantages.

(Means for Solving the Problems) The double-row spherical roller bearing of the present invention, like the conventional double-row spherical roller bearing described above, includes an inner ring having a concave spherical spherical outer-row double-row inner ring raceway, On the outer peripheral surface of the inner ring, the idler wheel fitted between the inner raceways of the double row and the inner peripheral surface facing the inner raceway of the double row have a single concave spherical outer raceway outer ring. And a plurality of spherical rollers provided in each row in a double row between the double row inner ring raceway and a single outer ring raceway,
A plurality of pockets for rotatably accommodating the spherical rollers are provided along the circumference of the bowl-shaped main body, and a flange extending inward in the radial direction is formed from the end on the small diameter side of the main body. It is composed of a plurality of cage retainers.

In particular, in the double-row spherical roller bearing of the present invention, the main body portion is located in the vicinity of the circle of revolution drawn by the center lines of the plurality of spherical rollers in the revolution direction of the spherical rollers, and the pockets Is formed slightly larger than the generatrix shape of the spherical roller housed in each pocket.

In addition, the engaging convex portion formed on one of the one end surface of the plurality of spherical rollers and the inner side surface of the flange and a portion facing the one end surface, and the engagement convex portion formed on the other surface. By engaging the engaging recess or the engaging hole with each other, the spherical rollers are prevented from falling out from the inside of the pocket containing the spherical rollers.

(Operation) With the double-row spherical roller bearing of the present invention configured as described above, the operation of allowing relative rotation between the shaft or the like having the outer ring fitted therein and the housing having the outer ring fitted therein, and the like. ,
The function of absorbing the deviation between the center axis of the shaft and the center line of the housing by the centering action and preventing the excessive force from being applied to the respective constituent parts during the operation of the double-row spherical roller bearing, This is similar to the conventional double row spherical roller bearing described above.

In particular, in the case of the double-row spherical roller bearing of the present invention, the engaging convex portion formed on one of the end surfaces of the plurality of spherical rollers and the portion of the inner surface of the flange facing the end surface, and the engaging convex portion formed on the other By engaging the engaging recesses or engaging holes with each other, each spherical roller is prevented from falling off from the inside of the pocket. Therefore, the outer peripheral surface of each spherical roller and the inner ring raceway rolling on this outer peripheral surface And the outer raceway is not damaged.

Also, since the inner size of the pocket can be strictly regulated,
It is possible to reduce skewing and noise generation of each spherical roller inside the pocket.

(Embodiment) FIGS. 1 and 2 show a first embodiment of the present invention. The double-row spherical roller bearing of the present invention, like the conventional double-row spherical roller bearing described above, has an inner ring having concave-spherical double-row inner ring raceways 1 and 1 on the outer peripheral surface, as shown in FIG. 2, the outer ring surface of the inner ring 2, the idler wheel 3 fitted around the central portion between the double row inner ring raceways 1, 1; and the double row inner ring raceway 1,
The inner peripheral surface facing 1 is a single concave spherical outer ring raceway 4
A plurality of spherical rollers 6, 6 provided in each row in a plurality of rows between the outer ring 5 and the inner row raceways 1, 1 of the above-mentioned double row and a single outer ring raceway 4; A plurality of pockets 10 for rollingly accommodating the rollers 6, 6 are provided along the circumferential direction of the bowl-shaped main body 8 and extend inward in the radial direction from the end of the main body 8 on the small diameter side. And a plurality of cage retainers 7 having flanges 9 formed therein.

Particularly, in the double-row spherical roller bearing of the present invention,
As shown in FIG. 2, the main body portion 8 is formed in the vicinity of the outer diameter side of a rotation circle (see the chain line α in FIG. 1) in which the center lines of the plurality of spherical rollers 6 are drawn along the revolving direction of the spherical rollers 6. The size of each pocket 10 is slightly larger than the generatrix shape of the spherical roller 6 accommodated in each pocket 10.

A circular engagement recess 13 is formed on one end surface 6a of each of the plurality of spherical rollers 6. In the actual case, the engagement recesses 13 may be formed on both end surfaces in order to eliminate the need to consider the assembly direction by making the spherical rollers 6 symmetrical, but from the aspect of implementing the present invention, It suffices to provide the engaging recess 13 only on the one end surface 6a. On the other hand, an engaging convex portion 14 that engages with the engaging concave portion 13 is formed on a portion of the inner surface of the flange 9 that faces the engaging concave portion 13.

The engagement protrusion 14 is formed by extruding a part of the flange 9 with a press. The tip of the engaging projection 14 is inclined in a direction that gradually increases from the outer peripheral side (upper side in FIG. 1) toward the inner peripheral side (also lower side). Also, the amount h by which the tip of the engaging projection 14 projects from one edge of the pocket 10 (the right edge in FIG. 1).
Pocket the other end surface (left end surface in FIG. 1) of the spherical roller 6.
One end surface 6a of the spherical roller 6 when abutting against the other end edge of 10
Is slightly larger (h> l) than the width l of the gap formed between the edge of the pocket 10 and the one edge of the pocket 10.

When the spherical roller 6 is stored in the pocket 10 of the cage cage 7, the engaging convex portion 14 is elastically deformed together with the flange 9, so that the engaging convex portion 14 and the one end surface 6a of the spherical roller 6 are formed. The engaged recess 13 is engaged with each other. After the engagement, each spherical roller 6 is prevented from falling off from the inside of the pocket 10.

The double row spherical roller bearing of the present invention configured as described above,
By the action of allowing relative rotation between a shaft or the like having the inner ring 2 fixed to the outside and a housing having the outer ring 5 fixed to the inside, and by displacing the outer ring 5 with respect to a plurality of spherical rollers 6, the above-mentioned shaft The effect of absorbing the deviation between the center line of the housing, etc. and the center line of the housing, etc., and preventing the unreasonable force from being applied to each component during the operation of the double row spherical roller bearing is the same as the conventional double row. Similar to spherical roller bearings.

Particularly, in the case of the double-row spherical roller bearing of the present invention, the engaging concave portion 13 formed on the one end surface 6a of the plurality of spherical rollers 6 and the engaging convex portion formed on the inner surface of the flange 9 of the cage retainer 7. By engaging the parts 14 with each other, each spherical roller 6 is inserted into the pocket 10
It prevents it from falling from the inside. For this reason, the outer peripheral surface of each spherical roller 6 and the inner ring raceway 1, which is in rolling contact with this outer peripheral surface,
1 and the outer ring raceway 4 (see FIG. 7) are not damaged.

Further, the inner dimension L of each pocket 10 can be strictly regulated. For this reason, it is possible to reduce the skew of each spherical roller 6 inside the pocket 10 and the generation of noise. That is,
In the case of the double row spherical roller bearing of the present invention, the inner dimension L of the pocket 10 of the cage 7 can be strictly controlled. For this reason, both end surfaces of the spherical roller 6 held in each pocket 10 are connected to both end edges of each pocket 10 or the side surfaces of the idler wheel 3 (Fig. 7) via a lubricating oil film having a desired thickness. And face each other. As a result, it is possible to reduce the possibility that the spherical rollers 6 are skewed inside each pocket 10 or that the end surface of each spherical roller 6 severely collides with the surface facing the end surface and generates noise.

Next, FIG. 3 shows a second embodiment of the present invention. In the case of this embodiment, the abutting portion 15 is formed by bending the inner peripheral portion (the lower portion in FIG. 3) of the flange 9 of the cage retainer 7 toward the pocket 10 side. The abutting portion 15 and one edge of the pocket 10 are located on the same plane orthogonal to the central axis of the spherical roller 6.

In the case of the present embodiment by forming such a contact portion 15, one end surface 6a of the spherical roller 6 held in each pocket 10 is formed.
Comes into contact with the abutting portion 15 at the same time as it comes into contact with one edge of the pocket 10. As a result, the spherical rollers 6 can be prevented from falling. Other configurations and operations are the same as those of the first embodiment described above, and therefore, the same reference numerals are given to the same portions, and duplicate description will be omitted.

Next, FIG. 4 shows a third embodiment of the present invention. In the first embodiment and the second embodiment described above, the engaging convex portion 14 on the inner surface of the flange 9 has a short cylindrical shape and the tip end surface is inclined. Has a triangular pyramid-shaped engaging projection 16 on the inner surface of the flange 9. Other configurations and operations are the same as those in the second embodiment described above, and therefore, the same reference numerals are given to the same portions, and duplicate description will be omitted.

Further, FIGS. 5 to 6 show a fourth embodiment of the present invention. The first to second embodiments described above and the third embodiment described above form the engagement recess 13 on the one end surface 6a of the spherical roller 6 and engage the engagement projection on the inner surface of the flange 9 of the cage cage 7. Part 14,
On the other hand, in the case of the present embodiment, the engaging convex portion 17 is formed on the one end surface 6a of the spherical roller 6, and a part of the flange 9 faces the engaging convex portion 17 in the present embodiment. An engaging hole 18 having a diameter larger than that of the engaging protrusion 17 is formed in the portion to be formed. Then, as the spherical roller 6 is pushed into the pocket 10 of the cage cage 7, the engaging convex portion 17 and the engaging hole 18 are engaged with each other to prevent the spherical roller 6 from falling out of the pocket 10. I am trying to Other configurations and operations are the same as those of the first embodiment described above, and therefore, the same reference numerals are given to the same parts,
A duplicate description will be omitted.

(Effect of the Invention) Since the double-row spherical roller bearing of the present invention is constructed and operates as described above, it is possible to improve the assemblability and ensure the reliability and durability of the double-row spherical roller bearing at the same time. A spherical roller bearing can be provided at low cost.

[Brief description of drawings]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a partial sectional view of a cage, FIG. 2 is a sectional view taken along the line AA of FIG.
FIG. 3 is a partial sectional view showing a second embodiment, FIG. 4 is a partial sectional view showing a third embodiment, FIGS. 5 to 6 show a fourth embodiment of the present invention, and FIG. FIG. 6 is a partial cross-sectional view of the cage, FIG. 6 is a cross-sectional view of BB in FIG. 5, FIG. 7 is a partial cross-sectional view showing a conventional example, and FIG. 8 is a cage type cage used in a conventional structure from the outer peripheral direction. The developed view seen in FIG. 9 is a sectional view taken along the line CC in FIG. 1: Inner ring track, 2: Inner ring, 3: Idling wheel, 4: Outer ring track, 5: Outer ring,
6: spherical roller, 6a: end surface, 7: cage retainer, 8: main body portion, 9: flange, 10: pocket, 11: pillar portion, 12: locking convex portion, 13: engaging concave portion, 14: engagement Joint convex part, 15: abutting part, 16, 17: engaging convex part, 18:
Engagement hole.

Claims (1)

(57) [Scope of utility model registration request] Claims: 1. An inner ring having a concave spherical spherical double-row inner ring raceway on the outer circumferential surface, an idler wheel fitted on the outer circumferential surface of the inner ring between the double-row inner ring raceways, and a double-row inner ring raceway. The inner ring surface facing the inner ring raceway has a single concave spherical outer ring raceway and the outer ring, and there are multiple rows in each row between the double row inner ring raceway and the single outer ring raceway. Each of the spherical rollers and a plurality of pockets for rollingly accommodating the spherical roller are provided along the circumferential direction of the bowl-shaped main body, and the inside of the main body in the radial direction from the small-diameter side edge of the main body. In a double-row spherical roller bearing consisting of a plurality of cage-shaped cages with flanges extending in one direction, the main body is drawn with the center line of the plurality of spherical rollers drawn along the revolution direction of the spherical rollers. The size of each of the above pockets is determined from the generatrix shape of the spherical roller that is placed in each pocket while being located near the circle. Engagement protrusions formed on one of the end surfaces of the plurality of spherical rollers and the inner surface of the flange and a portion facing the one end surface, which are formed slightly larger, and the other surface. The double row spherical roller bearing is characterized in that the respective spherical rollers are prevented from falling off from the inside of the pocket accommodating the spherical roller by engaging the engaging concave portion or the engaging hole formed in the above with each other. .