JP2016109253A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage of a bearing when an unexpected impact load and a large load are applied (at high-loading) by enlarging a bearing capacity and reducing plane pressure when the unexpected impact load and the large load are applied (at high-loading).SOLUTION: A rolling bearing is a radial needle bearing which is arranged between a rotating shaft 1 and an outer ring 2 which can relatively rotate with respect to each other, and arranged in a double-row. A rolling body 8 which is assembled in a center row is larger in diameter than rolling bodies 14, 20 which are assembled at left and right rows, and the rolling bodies are assembled with positive clearances a, b and b.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rolling bearing, and more particularly to a rolling bearing that suppresses torque at a light load and increases a bearing capacity at a heavy load.

  Various rolling bearings are incorporated in transmissions for various vehicles, transmissions for construction machines, transmissions for various industrial machines such as pumps, and the like.

Conventionally, for example, the technique of Patent Document 1 is disclosed as a rolling bearing that rotatably supports a pulley of a belt type continuously variable transmission for an automobile.
The rolling bearing disclosed in Patent Document 1 is a radial rolling bearing in which a plurality of rolling elements are incorporated between an inner ring and an outer ring. The feature of the rolling bearing is, for example, a large diameter rolling element and a small diameter rolling element. The rolling elements are alternately assembled in the circumferential direction, and the internal clearance (radial clearance) of the large-diameter rolling element is set as a negative clearance, and the internal clearance (radial clearance) of the small-diameter rolling element is configured as a positive clearance. In the point.

  Adopting such a configuration, while securing high rigidity against radial load, axial load and moment load, it suppresses the increase in torque and heat generation to prevent early seizure and abnormal noise generation, over a long period of time. The purpose is to maintain high lubricity. That is, the moment clearance is increased by making the radial clearance of the large-diameter rolling element negative, and the bearing capacity is increased by the load sharing of the small-diameter rolling element due to temperature change. In the technique disclosed in Patent Document 1, rolling elements having different Young's modulus and linear expansion coefficient are incorporated into a large-diameter rolling element and a small-diameter rolling element.

  However, according to the technique disclosed in Patent Document 1, it is assumed that the rolling bearing that rotates and supports the pulley increases the bearing capacity due to temperature change, but when an unexpected impact load or a high load is applied (high Since it was not assumed to increase the bearing capacity at the time of loading) to lower the surface pressure, there was a risk of bearing damage when an unexpected impact load or high load was applied (at the time of high load). Further, the large-diameter rolling element always had a negative clearance, and the torque was high even during normal times (light load).

JP 2006-138447 A

  The present invention has been made to solve such problems of the prior art, and the problem is that the bearing capacity when an unexpected impact load or a high load is applied (at the time of a high load). It is to prevent the bearing from being damaged when an unexpected impact load or a high load is applied (at the time of high load).

In order to achieve such an object, the first aspect of the present invention is a rolling bearing disposed between a first member and a second member that are relatively rotatable,
Rolling elements with different large and small diameters are incorporated, and each rolling element is incorporated with a positive clearance,
At light load, load only with rolling elements with large diameter,
This is a rolling bearing characterized in that when a sudden impact load or a high load is applied, in addition to a rolling element having a large diameter, a rolling element having a small diameter is also loaded.

  According to the second aspect of the present invention, in the rolling bearing of the first aspect of the present invention, the rolling elements are incorporated in a double row, and the diameters of the rolling elements incorporated in one row and the rolling members incorporated in another row are different. It is characterized by being.

  According to the present invention, when a sudden impact load or a high load is applied (at the time of high load), the bearing capacity is increased to reduce the surface pressure, and when an unexpected impact load or a high load is applied (at the time of high load). It is possible to prevent the bearing from being damaged.

It is a schematic longitudinal cross-sectional view which abbreviate | omits and shows 1st embodiment of this invention rolling bearing. It is a schematic longitudinal cross-sectional view which shows notionally that all the rollers of each row | line | column in 1st embodiment are integrated with the right clearance. It is a schematic longitudinal cross-sectional view which abbreviate | omits 2nd embodiment and is shown. It is a schematic longitudinal cross-sectional view which abbreviate | omits and shows a part of 3rd embodiment. A 4th embodiment is shown, (a) is a schematic vertical side view, (b) is a VV line schematic vertical front view. It is a schematic longitudinal cross-sectional view which abbreviate | omits and shows 5th embodiment. It is a schematic longitudinal cross-sectional view which abbreviate | omits and shows 6th embodiment. It is a schematic longitudinal cross-sectional view which abbreviate | omits 7th embodiment and is shown. FIG. 8A is a schematic plan view of the eighth embodiment, and FIG. 8B is a schematic vertical sectional view taken along line IX-IX of FIG. It is a schematic longitudinal cross-sectional view which abbreviate | omits and shows 9th embodiment partially.

Hereinafter, an embodiment of the rolling bearing of the present invention will be described with reference to the drawings.
The first to fifth embodiments illustrate radial needle bearings, and the sixth to ninth embodiments illustrate embodiments adopted for thrust needle bearings.
The embodiment described in the present specification and drawings is merely an embodiment of the present invention, and is not construed as limiting in any way, and can be modified within the scope of the present invention.

  The rolling bearing of the present embodiment is used in, for example, transmissions for various vehicles, transmissions for construction machines, transmissions for various industrial machines such as pumps, and the like, and is particularly arranged at locations where impact loads and excessive loads are easily applied. This is useful for installed rolling bearings.

"First embodiment"
FIG. 1 shows an outline of the rolling bearing according to the first embodiment of the present invention. In this embodiment, a needle roller bearing 3 in the center row and a needle shape in the left row (left row as viewed in FIG. 1). A double row in which the roller bearing 9 and the needle roller bearings 15 in the right row (right row as viewed in FIG. 1) are configured by separate cages 4, 10, 16 and needle rollers 8, 14, 20, respectively. It adopts one form of a separate radial needle bearing of C & R (cage & roller) specification.
The needle roller bearing 3 in the center row, the needle roller bearing 9 on the left side, and the needle roller bearing 15 on the right side have an outer diameter 1a of a first member (rotating shaft) 1 configured to be rotatable, The first member (rotating shaft) 1 and the second member (outer ring or housing) 2 disposed so as to be relatively rotatable are incorporated between the inner diameter 2a.

Each roller 8 of the needle roller bearing 3 in the center row is formed to have a larger diameter than each roller 14 of the needle roller bearing 9 in the left row and each roller 20 of the needle roller bearing 15 in the right row. Yes. The rollers 8, 14, 20 incorporated in the respective rows 3, 9, 15 incorporate rollers of the same diameter in each row.
The respective rollers 8, 14, and 20 have their internal clearances (radial clearances) a, b, and b until they are correct.
In the present embodiment, the central row of rollers 8, the left row of rollers 14, and the right row of rollers 20 are each configured to be disposed at the same position in the axial direction.
The diameter of the needle roller is not particularly limited, and when assembled between the first member 1 and the second member 2, the respective rollers 8, 15, 20 have the correct clearances a, b The size (diameter) can be incorporated.

In this embodiment, the cage (cage) 4 (10, 16) includes left and right annular portions 5 and 5 (11, 11, 17, and 17) and left and right annular portions 5 and 5 (11, 11, 17, and 17) A needle-like shape that is provided between a plurality of pillars 6 (12, 18) provided at predetermined intervals in the circumferential direction and a rolling element provided between adjacent pillars 6 (12, 18). A cage (cage) is assumed in which a plurality of pocket portions 7 (13, 19) for holding the rollers 8 (15, 20) in a rollable manner are formed. Each column part 6 (12, 18) has outer-diameter side parts 6a, 6a (12a, 12a, 12a, 12a, 12b) protruding in the horizontal direction so as to face each other from the left and right annular parts 5 and 5 (11, 11, 17, 17). 18a, 18a) and the inclined portions 6b, 6b (12b, 12b, 18b) formed facing each other downwardly from the free end side of the outer diameter side portions 6a, 6a (12a, 12a, 18a, 18a). 18b) and inner diameter side portions 6c (12c, 18c) which are integrally provided continuously in the horizontal direction from the free end side of the respective inclined portions 6b, 6b (12b, 12b, 18b, 18b). (See FIG. 1).
The configuration of the cage (cage) 4 (10, 16) is not limited to the illustrated form, and a well-known general cage (cage) can be employed within the scope of the present invention.

FIG. 2 shows the large-diameter roller 8 and the small-diameter rollers 14 and 20 and the rotary shaft 1 so that it can be easily understood that the rollers 8, 14, and 20 in each row 3, 9, and 15 are incorporated with a positive clearance. It is the conceptual diagram which expressed each internal clearance (radial clearance) between these extremely large.
The positive clearance between the large diameter roller 8 and the rotary shaft 1 is a, the positive clearance between the small diameter rollers 14 and 20 and the rotary shaft 1 is b, the diameter of the large diameter roller 8 is c, and the diameters of the left and right small diameter rollers 14 and 20 are d. Then, the setting of the internal clearance (radial clearance) can be expressed by the following equation.
a <b, b = a + radial displacement c> d, d = c-radial displacement Note that the radial displacement is calculated from a limit load that can be loaded by the large-diameter roller 8 through a desktop study.

According to the present embodiment, the load is applied only by the large-diameter roller 8 at a light load (low load), and the large-diameter roller 8 is displaced at a heavy load (high load). However, the load capacity is shared, and the bearing capacity is larger than when the load is applied only by the large-diameter roller 8. That is, according to this embodiment, since the radial clearance is up to the normal clearance of both the large diameter roller 8 and the small diameter rollers 14 and 20, the Young's modulus and the linear expansion coefficient are the same, and the large diameter roller 4 is radially displaced by a heavy load. As a result, the bearing capacity increases due to the load sharing of the small diameter rollers 14 and 20 accompanying the occurrence of the radial displacement (high capacity).
As described above, by incorporating the rollers 8, 14, and 20 having different diameters, the function as a rolling bearing is exhibited at the time of a light load (normal time), and an unexpected load such as an impact load, Since the bearing capacity increases with respect to the excessive load applied depending on the mode, it is possible to prevent an excessive surface pressure and a decrease in the life of the bearing.
Further, at the time of light load (normal time), since the load is received only by the large diameter roller 8, the torque can be suppressed low.
Further, since there is no need to make a step on the raceway surface of the mating member (for example, the shaft or the housing or the inner diameter of the outer ring), there is no need to process the shaft and the housing (the outer ring inner diameter).
Further, as in the present embodiment, a configuration is adopted in which the small diameter needle roller bearing 9 in the left row and the small diameter needle roller bearing 15 in the right row sandwich the large diameter needle roller bearing 3 in the central row. Even if it is in a misalignment state at the time of assembling into the rotating shaft (housing) 1, it also serves as a surface pressure sharing.

In the illustrated example, the central row of rollers 8 is a large diameter roller and the left and right rows of rollers 14 and 20 are small diameter rollers, but the central row of rollers is small and the left and right rows of rollers are large. This is also within the scope of the present invention, and the design can be changed as appropriate.
Further, in the present embodiment, rollers of the same diameter are incorporated in each row, but for example, a configuration in which a large diameter roller and a small diameter roller are alternately incorporated in the circumferential direction may be incorporated in each row. Is within the range.
Further, in the present embodiment, the center row roller 8, the left row roller 17, and the right row roller 20 are configured to be disposed at the same position in the axial direction. It may be configured to be arranged alternately (staggered), and is within the scope of the present invention.
Although this embodiment has been described with one embodiment of three rows, it may be two rows or more than four rows, and is not particularly limited.
The first member 1 and the second member 2 are appropriately selected within the scope of the present invention and can be widely applied.

"Second embodiment"
FIG. 3 shows a second embodiment of the present invention.
2nd embodiment is one Embodiment which employ | adopted the total roller form which does not have a holder | retainer for the roller 8 of the center row in 1st embodiment.
Other configurations and effects of the present embodiment are the same as those of the first embodiment.

"Third embodiment"
FIG. 4 shows a third embodiment of the present invention.
Unlike the first embodiment, the third embodiment is an integrated bearing that holds each row of rollers (center row roller 8, left row roller 14, right row roller 20) with one cage 21. It is one Embodiment which employ | adopted the form.
The retainer 21 is formed in an annular shape, and a plurality of pockets 22 are formed at predetermined intervals in the circumferential direction. In this embodiment, a plurality of pockets 22 for assembling the large-diameter rollers 8 are formed in the circumferential direction in the central row, and pockets 22 and 22 for assembling the small-diameter rollers 14 and 20 are circumferentially provided in the left and right rows, respectively. A plurality are formed in the direction.
Other configurations and effects of the present embodiment are the same as those of the first embodiment.

"Fourth embodiment"
FIG. 5 shows a fourth embodiment of the present invention.
The fourth embodiment is an embodiment in which the present invention is applied to a single row radial needle bearing.
This embodiment is composed of a single annular retainer 23 and a plurality of rollers 25, 26 incorporated in the retainer 23. A plurality of pockets 24 are formed in the retainer 23 at predetermined intervals in the circumferential direction, and large diameter rollers 25 and small diameter rollers 26 are alternately incorporated in the pockets 24 in the circumferential direction.

In this embodiment, as in the first embodiment, the positive clearance between the large diameter roller 25 and the rotary shaft 1 is a, the positive clearance between the small diameter roller 26 and the rotary shaft 1 is b, and the diameter of the large diameter roller 25 is c. Assuming that the diameter of the small-diameter roller 26 is d, the setting of the internal clearance (radial clearance) can be expressed by the following equation as in the first embodiment.
a <b, b = a + radial displacement c> d, d = c-radial displacement

In the present embodiment, the large diameter roller 25 and the small diameter roller 26 are alternately incorporated in the circumferential direction one by one. For example, one small diameter roller is alternately interposed between two large diameter rollers. Arbitrary arrangement configurations may be applied depending on the purpose and environment of use of the rolling bearing, such as an arrangement configuration in which two small diameter rollers are alternately interposed between one large diameter roller, for example. it can.
Other configurations and effects of the present embodiment are the same as those of the first embodiment.

"Fifth embodiment"
FIG. 6 shows a fifth embodiment of the present invention.
The fifth embodiment is an embodiment in which the present invention is applied to a shell-type radial needle bearing.
This embodiment is an embodiment in which the double-row radial needle bearing of the first embodiment is incorporated into a shell-shaped outer ring 27 made of a thin steel plate.
In the present embodiment, an example of an open type is shown, but a one-end sealed type may be used as appropriate.

In the present embodiment, the radial needle bearing of the first embodiment is applied as the bearing incorporated in the shell-shaped outer ring 27, but the radial needle bearing of the second embodiment to the fourth embodiment can also be applied. It is within the scope of the present invention. Moreover, the all-roller form without a cage may be sufficient.
Instead of the shell-shaped outer ring, a solid radial needle bearing in which the bearing of the first embodiment to the fourth embodiment is incorporated in a solid (machined) outer ring may be within the scope of the present invention. Furthermore, it may be a form with an inner ring.
Other configurations and effects of the present embodiment are the same as those of the first to fourth embodiments.

"Sixth embodiment"
FIG. 7 shows a sixth embodiment of the present invention in which the present invention is applied to a thrust needle bearing disposed between a first member (for example, a race) 1 and a second member (for example, a not-shown race). The outline of a form is shown.
In the present embodiment, the needle roller bearings 28 in the inner row (the right side row in FIG. 7) and the needle roller bearings 35 in the outer row (the left side row in FIG. 6) are respectively separate cages. (Cage) 30, 37 and needle rollers 34, 41 are used as a double row and separate C & R (cage & roller) specification thrust needle bearing.

Each roller 41 of the outer row needle roller bearing 35 has a larger diameter than each roller 34 of the inner row needle roller bearing 28. The rollers 34 and 41 incorporated in each row incorporate rollers of the same diameter in each row.
The rollers 34 and 41 have their internal clearances (radial clearances) a, b, and b until they are correct.
In the present embodiment, the outer row roller 41 and the inner row roller 34 are configured to be disposed at the same position in the axial center A1 direction (radial direction).
The diameter of the needle roller is not particularly limited and is large enough to allow each of the rollers 34 and 41 to be assembled with a correct gap when assembled between the first member 1 and the second member. (Diameter) may be used.

A large-diameter first cage 37 arranged in the outer row and a small-diameter second cage 30 arranged in the inner row are arranged concentrically.
Since the first cage 37 and the second cage 30 are different in size (diameter in the radial direction) and the others are the same, only the first cage 37 will be described in the present embodiment, and only the agreement for the second cage 30 will be described. The description is omitted.

  The first cage 37 (second cage 30) is formed in a hollow annular shape by combining a first annular portion 38 (31) and a second annular portion 39 (32) formed in a thin shape with a steel material or the like. Yes.

The first annular portion 38 (31) is annular with an annular plate portion 38a (31a) and an annular outer wall portion 38b (31b) provided continuously in the vertical direction from the inner and outer edges of the annular plate portion 38a (31a). A plurality of through-holes 38d (31d) are formed at predetermined intervals in the circumferential direction of the annular plate portion 38a (31a). ing.
On the other hand, the second annular portion 39 (32) is continuous in the vertical direction from the annular plate portion 39a (32a) and the inner and outer edges of the annular plate portion 39a (32a), like the first annular portion 38 (31). The annular outer wall portion 39b (32b) and the annular inner wall portion 39c (32c) provided in the cross-sectional view are formed in a substantially U shape, and a predetermined interval is provided in the circumferential direction of the annular plate portion 39a (32a). A plurality of through holes 39d (32d) are formed.
The second annular portion 39 (32) is positioned so as to fit in the space between the annular outer wall portion 38b (31b) and the annular inner wall portion 38c (31c) of the first annular portion 38 (31). It is formed smaller than 38 (31).
Each roller 41 (34) is rotatably held in a pocket 340 (33) formed by the through holes 38d and 39d (31d and 32d).
The cage structure is not limited to the illustrated form, and a well-known general cage can be used within the scope of the present invention.

In the present embodiment, the positive clearance between the large diameter roller 41 and the surface portion 1a of the first member (for example, race) 1 is a, the positive clearance between the small diameter roller 34 and the surface portion 1a of the first member (for example, race) 1 is b, If the diameter of the large diameter roller 41 is c and the diameter of the small diameter roller 34 is d, the setting of the internal clearance (radial clearance) can be expressed by the following equation as in the first embodiment.
a <b, b = a + radial displacement c> d, d = c-radial displacement

  According to the present embodiment, when a light load (low load) is applied, a load is applied only by the large-diameter roller 41 in the outer row, and during a heavy load (high load), the large-diameter roller 41 is displaced. The small-diameter rollers 34 in the row also share the load, and the bearing capacity becomes larger than when only the large-diameter rollers 41 are loaded.

In the illustrated example, the outer row of rollers is a large diameter roller 41 and the inner row of rollers is a small diameter roller 34. However, the outer row of rollers may be a small diameter and the inner row of rollers may be a large diameter. The design can be changed as appropriate within the scope of the present invention.
Further, in the present embodiment, rollers of the same diameter are incorporated in each row, but for example, a configuration in which a large diameter roller and a small diameter roller are alternately incorporated in the circumferential direction may be incorporated in each row. Is within the range.
Furthermore, in the present embodiment, the outer row roller 41 and the inner row roller 34 are each configured to be disposed at the same position in the axial center A1 direction (radial direction). It may be configured to be arranged alternately (staggered), and is within the scope of the present invention.
In the present embodiment, the description has been given with the embodiment of the two rows in the axial center A1 direction (radial direction), but there may be three or more rows, and is not particularly limited.
Other configurations and operational effects are the same as those of the first embodiment.

"Seventh embodiment"
FIG. 8 shows a seventh embodiment of the present invention.
Unlike the sixth embodiment, the seventh embodiment adopts an integrated bearing configuration in which the rollers (outer row rollers 46 and inner row rollers 47) are held by one cage (cage) 42. This is one embodiment.

  The retainer 42 is configured in a hollow annular shape by combining a first annular portion 43 and a second annular portion 44 formed in a thin shape with a steel material or the like.

The first annular portion 43 is substantially in a cross-sectional view constituted by an annular plate portion 43a, and an annular outer wall portion 43b and an annular inner wall portion 43c that are provided continuously from the inner and outer edges of the annular plate portion 43a in the vertical direction. A plurality of through holes 43d are formed at a predetermined interval in the circumferential direction of the annular plate portion 43a, and a row of such through holes 43d provided in the circumferential direction is formed in the radial direction. It is provided in double rows. In this embodiment, it is provided in two rows, an outer row and an inner row.
On the other hand, the second annular portion 44 is, like the first annular portion 43, an annular plate portion 44a, and an annular outer wall portion 44b and an annular inner wall provided continuously from the inner and outer edges of the annular plate portion 44a in the vertical direction. The section 44c is formed in a substantially U shape in a sectional view, and a plurality of through holes 44d are formed at the same positions as the through holes 43d of the first annular portion 43.
The second annular portion 44 is formed to be smaller than the first annular portion 43 to the extent that it fits in the space between the annular outer wall portion 43 b and the annular inner wall portion 43 c of the first annular portion 43.
Each roller is held so as to be able to roll 46, 47 in a pocket 45 formed by the through holes 43d, 44d. In this embodiment, as in the seventh embodiment, a large-diameter roller 46 is incorporated in the outer row and a small-diameter roller 47 is incorporated in the inner row.
The cage structure is not limited to the illustrated form, and a well-known general cage can be used within the scope of the present invention.
Other configurations and operational effects of the present embodiment are the same as those of the first embodiment and the sixth embodiment.

"Eighth embodiment"
FIG. 9 shows an eighth embodiment of the present invention.
The eighth embodiment is an embodiment in which the present invention is applied to a single-row radial needle bearing.
The present embodiment includes a single annular retainer 48 and a plurality of rollers 52 and 53 incorporated in the retainer 48. The cage 48 includes a first annular portion 49 and a second annular portion 50 as in the seventh embodiment. The cage 48 is a single row, and a plurality of cages are provided at predetermined intervals in the circumferential direction. A pocket 51 is formed, and the roller has large-diameter rollers 52 and small-diameter rollers 53 alternately incorporated in the circumferential direction.

The first annular portion 49 is substantially in a cross-sectional view composed of an annular plate portion 49a, and an annular outer wall portion 49b and an annular inner wall portion 49c that are respectively provided in the vertical direction from the inner and outer edges of the annular plate portion 49a. A plurality of through holes 49d are formed at predetermined intervals in the circumferential direction of the annular plate portion 49a, and a row of such through holes 49d provided in the circumferential direction is formed in the radial direction. It is provided in double rows.
On the other hand, the second annular portion 50 is, like the first annular portion 49, an annular plate portion 50a, and an annular outer wall portion 50b and an annular inner wall provided continuously in the vertical direction from the inner and outer edges of the annular plate portion 50a. The section 50c is formed in a substantially U shape in a sectional view, and a plurality of through holes 50d are formed at the same position as the through hole 49d of the first annular portion 49.
The second annular portion 50 is formed to be smaller than the first annular portion 49 to the extent that it fits in the space between the annular outer wall portion 49 b and the annular inner wall portion 49 c of the first annular portion 49.
The rollers 52 and 53 are rotatably held in the pocket 51 formed by the through holes 49d and 50d. In this embodiment, as in the seventh embodiment, a large-diameter roller 52 is incorporated in the outer row and a small-diameter roller 53 is incorporated in the inner row.
The cage structure is not limited to the illustrated form, and a well-known general cage can be used within the scope of the present invention.

Also in this embodiment, as in the sixth embodiment, the correct clearance between the large diameter roller 52 and the surface portion 1a of the first member (for example, race) 1 is a, and the small diameter roller 53 and the first member (for example, race) 1 are When the positive clearance with the surface portion 1a is b, the diameter of the large roller 52 is c, and the diameter of the small roller 53 is d, the setting of the internal clearance (radial clearance) is expressed by the following equation as in the first embodiment. Can do.
a <b, b = a + radial displacement c> d, d = c-radial displacement Note that the radial displacement is calculated from a limit load that can be loaded by the large-diameter roller 8 through a desktop study.
The respective rollers 52 and 53 have their internal clearances (radial clearances) a and b until they are correct.

In the present embodiment, one large diameter roller 46 and one small diameter roller 47 are alternately incorporated in the circumferential direction. For example, one small diameter roller is alternately interposed between two large diameter rollers. Arbitrary arrangement configurations may be applied depending on the purpose and environment of use of the rolling bearing, such as an arrangement configuration in which two small diameter rollers are alternately interposed between one large diameter roller, for example. it can.
Other configurations and operational effects of the present embodiment are the same as those of the first embodiment, the sixth embodiment, and the seventh embodiment.

"Ninth embodiment"
FIG. 10 shows a ninth embodiment of the present invention.
The ninth embodiment is an embodiment in which the single row radial needle bearing of the eighth embodiment is covered and integrated with an outer race (outer ring) 54 and an inner race (inner ring) 55.
In addition, it is also possible to apply the thrust needle bearing of 6th embodiment 8th embodiment, and it is in the scope of the present invention.
Other configurations and operational effects are the same as those of the first embodiment and the sixth to eighth embodiments.

In the present embodiment, the description has been given with the rolling bearings used for various vehicle transmissions, transmissions for construction machines, transmissions for various industrial machines such as pumps, etc., but in particular, locations where impact loads and overloads are likely to be applied. If it is a rolling bearing which may be arrange | positioned, it can utilize widely.
Moreover, although this embodiment demonstrated with the needle roller bearing, it can utilize also for a ball bearing.

DESCRIPTION OF SYMBOLS 1 First member 2 Second member 8 Center row roller 14 Left row roller 20 Right row roller a Clearance (gap between large-diameter roller and first member)
b Gap (gap between small diameter roller and first member)
c Roller diameter (diameter of large diameter roller)
d Roller diameter (diameter of small diameter roller)

Claims (2)

A rolling bearing disposed between a first member and a second member capable of relative rotation,
Rolling elements with different large and small diameters are incorporated, and each rolling element is incorporated with a positive clearance,
At light load, load only with rolling elements with large diameter,
A rolling bearing characterized in that when a sudden impact load or a high load is applied, in addition to a rolling element having a large diameter, a rolling element having a small diameter is loaded. The rolling bearing according to claim 1, wherein the rolling elements are incorporated in a double row, and the diameters of the rolling elements incorporated in one row and the rolling members incorporated in another row are different.

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