JP2003322156A - Roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing having a flange at each end of rollers capable of manufacturing a retainer easily and assembling an inner ring, the rollers, and the retainer easily. <P>SOLUTION: The roller bearing is equipped with the inner ring 1, an outer ring 2, the rollers 4 having flanges at their ends and interposed between the inner ring 1 and the outer ring 2, and the retainer 3. The retainer 3 has a ring 3a positioned beside the end of the flange 5 side of each roller 4 and a plurality of hitching parts 3b extending between the adjoining rollers 4 from the peripheral edge of the ring 3a and engaged with the inner side face of each flange 5. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller bearing which is generally used in machine tools and other industrial machines, and more particularly to a roller bearing which uses a roller having a flange portion at its end.

[0002]

2. Description of the Related Art In a tapered roller bearing, as shown in FIG. 9, a roller 24 rolls in contact with the rolling surfaces of inner and outer races 21, 22 at an outer diameter surface 24b. However, the contact portion P where the roller end surface contacts the large flange 21a of the inner ring 21 is located on a smaller radius with respect to the roller center O than where the extended surface of the conical outer diameter surface of the roller 24 intersects with the large flange 21a. Will be done.
Therefore, slippage occurs at the contact portion P. The contact portion P is a portion that receives an axial load, and the above-mentioned slipping causes a large amount of heat generation during high-speed rotation. In the case of roller bearings for machine tool spindles, the above-mentioned heat generation causes thermal expansion of the spindle, which causes a decrease in the accuracy of the workpiece. In a bearing for a railway vehicle, the heat generated causes softening and oiling of the grease, which causes grease leakage. As a means for solving such a problem, as shown in FIG. 8, there has been proposed one in which a flange portion 25 is provided at an end portion of a roller 24 (Japanese Patent Laid-Open No. 9-236).
No. 131). With the flange portion 25, the radial position Q where the roller end surface 24a contacts the inner ring large collar 21a is a conical surface S that is an extension surface of the roller outer diameter surface 24b.
Can be made to coincide with the position where the roller crosses the roller end surface 24a. As a result, the peripheral speed difference is eliminated, and heat generation due to slippage is reduced. Also in such a bearing having the flange portion 25 on the roller 24, the cage 23 is provided with the pockets 23b for holding the rollers 24 at a plurality of positions in the circumferential direction, as in the case of the ordinary tapered roller bearing. The type is used. The shape of the pocket 23b is a shape having a steal portion 23ba into which the flange 25 of the roller 24 is fitted.

[0003]

However, in the case where the roller 24 has a shape having the flange portion 25, the ladder type cage 2 for holding the roller 24 in the conventional pocket 23b.
In No. 3, it was difficult to assemble the inner ring 21, the rollers 24, and the cage 23. That is, in the tapered roller bearing, the assembling procedure of assembling the outer ring 22 with respect to the assembling parts including the inner ring 21, the rollers 24, and the cage 23 is taken. Therefore, it is necessary that the roller 24 does not drop from the cage 23 in the state of the above-mentioned assembled parts, and the cage 23 incorporates the roller 24 from the inner diameter side. In this way, when the rollers 24 are assembled from the inner diameter side of the cage 23, the flange portion 25 becomes an obstacle and the assembly becomes difficult. Further, also in the case of manufacturing the cage 23, since it is necessary to form the steal portion 23ba in the pocket 23b in order to avoid interference with the flange portion 25, the manufacturing process of the cage 23 can be easily increased.

An object of the present invention is a roller bearing having a flange portion at the roller end portion, but a roller bearing in which the cage can be easily manufactured and the inner ring, the roller and the cage can be easily assembled with each other. Is to provide.

[0005]

A roller bearing according to the present invention comprises:
An inner ring and an outer ring, and a plurality of rollers that have flange portions at their ends and are arranged side by side in the circumferential direction between the rolling surfaces of the inner and outer rings,
And a cage for holding the plurality of rollers. The cage extends between a ring portion located on the side of an end portion of the roller on the flange portion side, and extends from a peripheral edge of the ring portion between adjacent rollers to engage with an inner surface of the flange portion of the roller. It has a plurality of hooks. According to this structure, the hooking portion is interposed between the adjacent rollers to hold the distance between the rollers. Further, the hook portion holds the roller by engaging with the inner surface of the flange portion. Since the retainer is composed of the ring portion and the hook portion, the shape is simpler than that of the conventional retainer in which the steal portions are formed on both sides in the pocket.
Easy to manufacture. Further, for example, each hook portion of the cage is formed into a straight shape that does not bend before assembly, and is bent in a V-shaped cross section at the time of assembly so as to engage with the roller flange portion. It is possible to easily assemble the existing assembly.

In the present invention, the roller bearing is a tapered roller bearing, and the roller has a flange portion on the large end side,
The inner ring has a large collar, the ring portion of the cage is located on the outer periphery of the large collar of the inner ring, and each hooking portion of the cage is a bent piece extending from the outer peripheral edge of the ring portion. Good as a thing. For tapered roller bearings, the width of the outer ring is
It is not necessary to widen it toward the flange portion of the roller larger end than the raceway surface, and a wide space can be obtained on the outer periphery of the roller arrangement on the large end side. Therefore, the hook portion extending from the outer peripheral edge of the ring portion of the retainer and engaging with the flange of the roller can be formed without fear of interfering with the outer ring, and can be formed reasonably in terms of dimensions. Further, since the hooking portion is a bent piece, the inner ring, the roller, and the cage can be easily assembled with each other.

In the present invention, the ring portion of the cage may be guided by the outer diameter surface of the large collar of the inner ring. In this way, by guiding the cage with the large collar of the inner ring,
High-speed stability of the cage can be secured. Further, since the ring portion of the cage is guided by the large brim of the inner ring, the load on the portion that becomes the pillar portion of the cage, such as the hooking portion, is reduced, and the effect of preventing wear of the cage and extending the life of the cage can be expected. Moreover, since the whirling can be suppressed, a noise prevention effect can be expected.

In these inventions, the hook portion of the cage may be provided with a column portion extending toward the other end side of the roller rather than a portion engaging with the inner surface of the flange portion of the roller. By making the column of the cage longer, the skew of the rollers can be further suppressed.

Further, in these inventions, the inner ring may have a circumferential groove into which the flange portion of the roller fits, and may not have a small flange. When the circumferential groove is formed on the inner ring in this way, the roller retains the flange part at the hooking part of the cage, and the flange engages with the circumferential groove of the inner ring, so the roller and the cage must be separated from the inner ring. There is no. Therefore, the small brim of the inner ring can be omitted, which further facilitates the manufacturing.

[0010]

1 is a block diagram of a first embodiment of the present invention.
It will be described based on. This example is applied to a tapered roller bearing. Inner ring 1 with double collars and outer ring 2 without collars
A tapered roller 4 held by a cage 3 is interposed between the rolling surfaces 1c and 2c.

As shown in FIG. 1A, the roller 4 has a flange portion 5 on the outer circumference of the large diameter end. By providing the flange portion 5, the roller end surface 4a that contacts the inner ring large collar 1a
Is larger than the maximum diameter d2 of the inner ring rolling contact portion of the outer diameter surface 4b of the roller 4. As a result, the radial position Q of the roller end surface 4a in contact with the inner ring large collar 1a is made to coincide with the position where the conical surface S, which is an extended surface of the roller outer diameter surface 4b, intersects with the roller end surface 4a. In order to make such contact, the shape of the inner surface of the inner ring large collar 1a is also
The cross-sectional shape is such that the contact portion with the roller end surface 4a swells.
The flange portion 5 of the roller 4 is shaped so as to expand in a conical shape from the inner ring rolling contact portion 4ba to the roller end surface 4a side. The roller end surface 4a is formed as a spherical convex curved surface with its shaft portion slightly protruding, and its peripheral portion is formed in a chamfered shape having an arc-shaped cross section. At both ends of the rolling surface 1c of the inner ring 1, polishing grooves 6 are provided on the inner ring small flange 1b side, and on the inner ring large flange 1a side, a circumferential groove 7 also serving as a polishing groove for fitting the flange portion 5 of the roller 4 is formed. I am doing it. The circumferential groove 7 has a V-shaped groove with a rounded bottom, and the inner side surface of the groove on the inner ring large flange 1a side is formed into a curved surface slightly recessed from the inner side surface of the inner ring large flange 1a. The outer ring 2 has a width that does not interfere with the flange portion 5 of the roller 4, and is narrower than the inner ring 1.

The cage 3 is provided on the side of the end of the roller 4 on the side of the flange 5 and the ring 3a, and is provided at a plurality of circumferential positions of the ring 3a, as shown in FIG. 1B. And a hooking portion 3b extending between the rollers 4 adjacent to each other to form a comb-shaped ring body. As shown in FIG. 1 (A), these hooking portions 3b are formed by bent pieces having a V-shaped cross section extending from the outer peripheral edge of the cage ring portion 3a, and on the inner side surfaces of the flange portions 5 of two adjacent rollers 4, Both sides are engaged with each other. The ring portion 3a of the cage 3 is located on the outer periphery of the inner ring large flange 1a and is guided by the inner ring large flange 1a. The ring portion 3a has a cylindrical guided portion 3aa that is inclined so as to have a cross-sectional shape substantially parallel to the large end surface of the roller 4 and projects outward from the inner diameter edge in the axial direction.
The guided portion 3aa guides the outer diameter surface of the inner ring large collar 1a. The cage 3 is a molded product of a metal plate such as a steel plate.

According to this structure, when the bearing is rotating,
The roller 4 rotates along with the rolling contact with the inner and outer rings 1 and 2, but the radial position Q at which the roller end surface 4a comes into contact with the inner ring large collar 1a is
Since it is located at a position where it intersects with the conical surface S that is an extension of the roller outer diameter surface 4b, the difference in peripheral speed between the contact portion between the roller end surface 4a and the inner ring large collar 1a is small, and slippage due to the difference in peripheral speed is reduced. As described above, since the sliding of the roller 4 and the inner ring large collar 1a, which is the main cause of heat generation of the tapered roller bearing during high speed rotation, is reduced, heat generation is dramatically reduced.

Further, since the cage 3 is a comb-teeth ring body composed of the ring portion 3a and the hook portion 3b, and the hook portion 3b is engaged with the roller flange portion 5,
The roller 4 and the cage 3 can be assembled so as not to come off the inner ring 1. Since the cage 3 is thus formed of the ring portion 3a and the hook portion 3b, the cage 3 has a simpler shape and is easier to manufacture than a cage having a complicated pocket shape for holding a flanged roller. Become. Also,
Prior to assembly, each hook 3b of the cage 3 has a straight shape that does not bend as shown by the chain line in FIG. 1 (A), and is bent into a V-shaped cross section as shown by the solid line at the time of assembly so that the roller flange 5 Can be engaged with. Therefore, it is possible to easily perform the assembly which is difficult in the conventional example. Furthermore, since the cage 3 is guided to the outer diameter surface of the large inner collar 1a, the cage 3 can be secured at high speed. Since the cage 3 is guided by the inner ring large collar 1a, the load on the hook portion 3b which is the pillar portion of the cage 3 is reduced, and the cage 3
The effects of suppressing wear and extending the life can be expected. Also,
Since whirling is suppressed, a noise suppressing effect can be expected.

FIG. 2 shows another embodiment of the present invention.
In this embodiment, in the first embodiment, the hook portion 3b of the cage 3 has a pillar portion 3b extending toward the other end side of the roller 4 from a portion 3ba engaging with the inner side surface of the roller flange portion 5.
b is provided. The column portion 3bb extends to the vicinity of the center of the roller 4 in the length direction. Further, in this embodiment, the small flange 1b of the inner ring 1 provided in the first embodiment of FIG. 1 is omitted. It should be noted that the embodiment of FIG. 2 and each subsequent embodiment are the same as the first embodiment except for matters that are particularly described.
The configuration is the same as that of the above embodiment.

When the column portion 3bb is formed long as described above, the skew of the roller 4 can be further suppressed. Further, the roller 4 is held by the retainer 4 by the hook portion 3b of the retainer 3, and the roller flange portion 5 is fitted in the circumferential groove 7 of the inner ring 1, so that the roller 4 and the retainer 3 are separated from the inner ring 1. Since it does not come off, the inner ring small collar 1b (Fig. 1 (A))
Can be abolished. This further facilitates the manufacture of the bearing. The small inner collar 1b can be omitted regardless of the presence or absence of the elongated pillar portion 3bb.

FIG. 3 shows still another embodiment of the present invention. In this embodiment, the cylindrical guided portion 3aa is omitted from the first embodiment of FIG. 1, and the inner diameter surface of the flat ring portion 3a is guided to the outer diameter surface of the inner ring large flange 1a. It is the one. The hook portion 3b extending from the outer peripheral edge of the ring portion 3a and bent in a U shape is engaged with the flange portion 5 of the roller 4. It is the same as the embodiment of FIG. 2 that the hooking portion 3b includes a portion 3ba that engages with the roller flange portion 5 and a column portion 3bb that extends from this engaging portion 3b to the other end side of the roller 4. . Also in this embodiment, the inner ring small collar 1b (FIG. 1 (A)) is omitted as in the case of the embodiment of FIG. By thus forming the ring portion 3a of the cage 3 into a flat plate shape, the shape of the cage 3 is further simplified, and the cage 3 can be manufactured more easily. In addition, in this embodiment, the ring 3a of the retainer 3 may have a cylindrical flange (not shown) on the outer diameter edge, and the hook 3b may extend from the tip of the flange.

FIG. 4 shows still another embodiment of the present invention. This example is applied to a cylindrical roller bearing.
The inner ring 11 is provided with both flanges, and the outer ring 12 is formed by dividing one of the flanges into side wheels 12a. These inner ring 11 and outer ring 1
A cylindrical roller 14 held by a cage 13 is interposed between the two. In this example, the flange portions 15 are provided on the outer circumferences of both ends of the roller 14, and the diameter of the roller end surface 14a that contacts the inner ring flanges 11a and 11a on both sides is smaller than the diameter of the inner ring rolling contact portion on the outer diameter surface of the roller 14. It's big. Also,
The radial position Q'of the roller end surface 14a that contacts the inner ring flange 11a is the position where the cylindrical surface S'which is an extension of the roller outer diameter surface intersects the roller end surface 14a. As a result, slippage between the roller end surface 14a and the inner ring collar 11a is reduced and heat generation is reduced.

As in the case of the first embodiment of FIG. 1, the cage 13 includes a ring portion 13a located on the outer periphery of one inner ring collar 11a and a bent piece extending from the outer peripheral edge of the ring portion 13a. It has a plurality of hooks 13b. It is the same as in the first embodiment that the hook portion 13b extends between the adjacent rollers 14 and engages with the inner surface of the roller flange portion 15.

Also in the case of being applied to the cylindrical roller bearing as described above, the cage 13 has a simple shape and is easy to manufacture. Further, the holder 3 can be easily assembled in the same manner as in the case of the first embodiment shown in FIG.

FIG. 5 shows another configuration example of the tapered roller 4 in the tapered roller bearing of the first embodiment shown in FIG. The tapered roller 4 has a divided structure in which the flange portion 5 is a separate part from the roller body 8. Here, the roller body 8 shown in FIG. 5 (A), the connecting shaft 9, and the flange portion 5 divided into three parts are combined to form the roller 4 as shown in FIG. 5 (B). That is, by fitting the connecting shaft 9 into the shaft hole 8a of the roller body 8 by interference fit, and by fitting the protruding portion of the connecting shaft 9 from the roller body 8 into the shaft hole 5a of the flange portion 5 by interference fit, A tapered roller 4 having a flange portion 5 on the outer circumference of the roller large end surface is constituted.

Further, in this case, the fitting portion 9a of the connecting shaft 9 surrounded by the chain line in FIG. 5 (A) to the roller body 8 is provided with a crowning as shown in a sectional view in FIG. 5 (C). It has been subjected. As a result, with the connecting shaft 9 fitted in the shaft hole 8a of the roller body 8, the roller rolling surface 8b of the roller body 8 surrounded by the chain line in FIG.
The crowning shape is as shown in the sectional view of FIG.

Thus, the roller body 8, the connecting shaft 9,
By composing the tapered roller 4 having the flange portion 5 by combining the flange portion 5 into three parts, grinding of the roller rolling surface can be performed without a center, and mass productivity is improved. By the way, in the case of the tapered roller 4 integrally having the flange portion 5 on the outer periphery of the large end surface, it is indispensable to support the center at the time of machining, and especially grinding of the rolling surface becomes complicated.

Further, as described above, by fitting and connecting the roller body 8 and the flange portion 5 through the crowned connecting shaft 9, the crowning can be formed on the roller rolling surface 8b. The process can be omitted, and the manufacturing becomes easier.

The divided product of the roller 4 is 3 as shown in FIG.
Not only in the case of divided products, but as shown in FIG. 6 and FIG.
It may be a divided item. In the case of FIG. 6, the flange portion 5 in which the roller body 8 having the shaft hole 8a and the connecting shaft 9 are integrally formed
It is composed of two split parts, and the connecting shaft 9 is connected to the shaft hole 8a of the roller body 8.
The tapered roller 4 with the flange portion 5 is formed by interference fitting. In the case of FIG. 7, the roller body 8 integrally formed with the connecting shaft 9 and the flange portion 5 having the shaft hole 5a
It is composed of two split parts, and the connecting shaft 9 is connected to the shaft hole 5
The tapered roller 4 with the flange portion 5 is formed by interference fitting with a.

As described above, also when the tapered roller 4 having the flange portion 5 is constructed by combining the two-divided products, it is possible to grind the rolling surface of the roller without the center, and the mass productivity is improved. The roller 4 with the flange portion 5 having the divided structure shown in FIGS. 5 to 7 can be used regardless of the structure of the cage 3, and can also be used in the conventional roller bearing shown in FIG.

[0027]

According to the present invention, in a roller bearing using rollers with a flange portion, a cage for holding the rollers is provided.
Since it has a ring portion located on the side of the flange portion of the roller and a plurality of hook portions that extend from the peripheral edge of the ring portion between adjacent rollers and engage with the flange portion of the roller, the holding The shape of the container is simple and the manufacturing is easy. Further, even if the retainer is used to prevent the rollers from falling off, the hooking portion can be bent at the time of assembly, and the assembly can be easily performed. In particular, in the case of a tapered roller bearing, in which the roller has a flange portion on the large end side and the inner ring has a large collar, the hook portion can be formed reasonably in terms of dimensions, and Easy to support. If it is a tapered roller bearing,
When the ring portion of the cage is guided by the outer diameter surface of the large collar of the inner ring, high-speed stability of the cage can be ensured. Further, by guiding the ring portion of the cage with the large collar of the inner ring, the load on the column portion such as the hook portion of the cage is reduced, and wear of the cage can be prevented and life extension effect can be expected. Since the whirling can be suppressed, a noise prevention effect can be expected. If the hook portion of the cage is provided with a column portion that extends toward the other end of the roller rather than the portion that engages with the inner surface of the flange portion of the roller, the skew of the roller can be further suppressed. If the rollers are held by the cage hooks and the flanges fit into the circumferential groove of the inner ring, there is a risk that the rollers and the cage will come off the inner ring even if there is no small rib on the inner ring. Without the small inner collar. This further facilitates manufacturing.

[Brief description of drawings]

FIG. 1A is a sectional view of an embodiment of the present invention,
(B) is a side view seen from the arrow B direction in (A).

FIG. 2 is a sectional view of another embodiment of the present invention.

FIG. 3 is a sectional view of still another embodiment of the present invention.

FIG. 4 is a sectional view of still another embodiment of the present invention.

5A is an exploded view showing an example of a roller in the embodiment of FIG. 1, FIG. 5B is a sectional view showing an assembled state of the roller,
(C) is sectional drawing which shows the crowning of the fitting part of the connection shaft in the same roller, (D) is sectional drawing which shows the crowning of the rolling surface of the same roller.

FIG. 6 is an exploded view showing another example of a roller.

FIG. 7 is an exploded view showing still another example of a roller.

FIG. 8A is a cross-sectional view of a conventional example, and FIG. 8B is a plan view of the cage viewed from the direction of arrow A in FIG.

FIG. 9 is a cross-sectional view of another conventional example.

[Explanation of symbols]

1,11 ... inner ring 1a ... Inner ring large tsuba 11a ... Inner ring tsuba 1c, 11c ... Rolling surface 2, 12 ... Outer ring 2c, 12c ... Rolling surface 3,13 ... Cage 3a, 13a ... Ring part 3b, 13b ... Hooking part 3ba ... Engaging portion of hooking portion 3bb ... Pillar of hook 4… Cone roller 5, 15 ... Roller flange 7, 17 ... Circumferential groove 14 ... Cylindrical rollers

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yuji Okamoto             Mie Prefecture Kuwana City Oogata Oyumi 3066 N             Inside Thien Co., Ltd. F term (reference) 3J101 AA16 AA25 AA32 AA42 AA54                       AA62 BA05 BA47 BA53 BA57                       FA44 FA46 GA31

Claims (5)

[Claims] 1. An inner ring and an outer ring, a plurality of rollers having flange portions at the ends thereof and arranged side by side in the circumferential direction between rolling surfaces of the inner and outer rings, and a cage for holding the plurality of rollers. The cage is provided with a ring portion located on the side of an end portion on the flange portion side of the roller and an inner surface of the flange portion of the roller that extends from the peripheral edge of the ring portion between adjacent rollers. A roller bearing having a plurality of engaging hooks. 2. A tapered roller bearing, wherein the roller has a flange portion on the large end side, the inner ring has a large collar, and the ring portion of the cage is located on the outer periphery of the large collar of the inner ring. The roller bearing according to claim 1, wherein each of the hooking portions of the cage is a bent piece extending from an outer peripheral edge of the ring portion. 3. The roller bearing according to claim 2, wherein the ring portion of the cage is guided by the outer diameter surface of the large collar of the inner ring. 4. The pillar portion according to claim 2 or 3, wherein the hook portion of the cage is provided with a column portion extending toward the other end side of the roller from a portion engaging with the inner surface of the flange portion of the roller. Roller bearing. 5. The inner ring has a circumferential groove into which the flange portion of the roller fits and has no small flange.
The roller bearing according to claim 4.