JP2009058087A - Cylindrical roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure including a cage 4a enlarging load capacity of a cylindrical roller bearing, and preventing drop of a cylindrical roller 3a out of a pocket 10 of the cage 4a even when an outer ring 1 is separated from an inner ring 2 before assembling them to an operation position. <P>SOLUTION: A recess section 14 is formed on an axial direction edge surface of the cylindrical roller 3a. A projection section 15 to be fitted in the recess section 14 is formed on an axial direction inner surface of a rim section 9a constituting the cage 4a. The above problem is solved by applying this structure. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an improvement in a cylindrical roller bearing used by being incorporated in a rotation support portion of a general industrial machine, particularly a wind power generator.

  For example, a roller bearing such as a cylindrical roller bearing is incorporated in a rotation support portion to which a large radial load is applied, such as a rotation support portion of a wind power generator (for example, a speed increaser incorporated between a propeller and a generator). ing. FIGS. 10-11 has shown an example of the cylindrical roller bearing which employ | adopted the cage structure conventionally described in patent documents 1-2. This cylindrical roller bearing includes an outer ring 1 that is a stationary ring that does not rotate even when used, an inner ring 2 that is a rotating ring that rotates when used, a plurality of cylindrical rollers 3 and 3, and a cage 4. Of these, the outer ring 1 is provided with a cylindrical outer ring raceway 5 at an axially intermediate portion of the inner peripheral surface, and an inward flange-like flange 6 at one end in the axial direction (left end portion in FIG. 10). . Further, the inner ring 2 is provided with a cylindrical inner ring raceway 7 at an axially intermediate portion of the outer peripheral surface, and outward flange-like flanges 8 and 8 at both axially opposite ends. The cylindrical rollers 3 and 3 are provided between the outer ring raceway 5 and the inner ring raceway 7 so as to be rotatable while being held by the cage 4.

  The retainer 4 is an integrally formed product called a press-type retainer, for example, and is formed into a cylindrical shape as a whole by subjecting a metal plate to press working such as punching and bending. Such a retainer 4 is disposed at both ends in the axial direction and is arranged at equal intervals with respect to the circumferential direction with a pair of rim portions 9 and 9 each having an annular shape. A plurality of column portions 10 and 10 are provided on the inner side surface in the axial direction of both rim portions 9 and 9. Then, the cylindrical rollers 3 and 3 are placed on the inner sides of the portions surrounded by the both sides in the circumferential direction of the pillars 10 and 10 and the axially inner side surfaces of the rims 9 and 9. A plurality of pockets 11, 11 that can be freely rolled are provided. The column portions 10 and 10 are arranged in a state of being shifted radially inward with respect to the pitch circles of the cylindrical rollers 3 and 3 (circles passing through the centers of the cylindrical rollers 3 and 3). . At the same time, the interval between the column portions 10 and 10 adjacent to each other in the circumferential direction is made smaller than the diameter of the cylindrical rollers 3 and 3. Moreover, the cross-sectional shape of each said pillar part 10 and 10 is made into a substantially trapezoid, The plane of the direction in alignment with the rolling surface of each said cylindrical roller 3 and 3 is made into the circumferential direction both sides | surfaces of each said pillar part 10 and 10, respectively. Or it is a concave curved surface. Further, in the structure shown in the drawing, the radial direction of the cage 4 is obtained by engaging the outer peripheral surfaces of the pair of flange portions 8 and 8 constituting the inner ring 2 with the inner peripheral surfaces of both axial end portions of the cage 4. The position is regulated. For this purpose, specifically, in a state where the inner ring 2 and the cage 4 are arranged concentrically with each other, the inner circumferential surface of both axial ends of the cage 4 is the outer circumferential surface of the both flange portions 8 and 8. Is in close proximity to each other.

  In the case of the cylindrical roller bearing configured as described above, the column portions 10 and 10 constituting the retainer 4 are arranged in a state of being shifted radially inward with respect to the pitch circle of the cylindrical rollers 3 and 3. At the same time, the interval between the column portions 10 and 10 adjacent to each other in the circumferential direction is made smaller than the diameter of the cylindrical rollers 3 and 3. For this reason, the space | interval of each said cylindrical rollers 3 and 3 can be narrowed, ensuring the thickness of each said column part 10 and 10 fully. Therefore, the total number of these cylindrical rollers 3 and 3 can be increased by that amount, and the load capacity of the cylindrical roller bearing can be increased.

  However, in the case of the cylindrical roller bearing described above, considering the state in which the outer ring 1 and the inner ring 2 do not exist, the cylindrical rollers 3 and 3 held in the pockets 11 and 11 of the cage 4 Based on the presence of 10 and 10, it cannot escape radially inward, but can freely escape radially outward. For this reason, before assembling the cylindrical roller bearing at the place of use (for example, during conveyance), the outer ring 1 and the inner ring 2 are separated, and the cylindrical rollers 3 and 3 are pivoted from the radially inner side of the outer ring 1. When a situation occurs such that the cylindrical rollers 3 and 3 are pulled out, there arises a problem that the cylindrical rollers 3 and 3 are dropped from the pockets 11 and 11 radially outward. Therefore, in order to avoid the occurrence of such a problem, in the case of the above-described cylindrical roller bearing, the other axial end portion of the inner peripheral surface of the outer ring 1 (the right end portion in FIG. A locking groove 12 is formed on the entire periphery of the portion where no ring exists, and a retaining ring 13 having a ring shape is assembled in the locking groove 12. The retaining ring 13 prevents the cylindrical rollers 3 and 3 from coming out from the radially inner side of the outer ring 1 in the axial direction.

  However, when the size of the cylindrical roller bearing is large, the depth of the locking groove 12 may be locally shallow due to heat treatment deformation during the production of the outer ring 1. In such a case, the retaining ring 13 locked in the locking groove 12 is likely to drop off, which is not preferable. In the first place, it is not preferable to provide the locking groove 12 and the retaining ring 13 as described above because it leads to an increase in the number of parts and an increase in cost.

German Patent Application No. 102004028376 European Patent Application No. 1605175

  The cylindrical roller bearing according to the present invention is configured to prevent the cylindrical roller from falling out of the cage pocket in order to avoid the need to provide the locking groove 12 and the retaining ring 13 as described above. Invented.

  The cylindrical roller bearing of the present invention includes an outer ring having a cylindrical outer ring raceway at an axially intermediate portion of an inner peripheral surface, an inner ring having a cylindrical inner ring raceway at an axially intermediate portion of an outer peripheral surface, and the inner ring raceway. And a plurality of cylindrical rollers rotatably provided between the outer ring raceway and the outer ring raceway, and a cage for holding the cylindrical rollers in a freely rollable manner. Further, the cage is disposed at both ends in the axial direction, each pair of rim portions having an annular shape, and equally spaced from each other with respect to the circumferential direction. It consists of a plurality of pillars that are connected to the inner surface in the axial direction. A plurality of pockets that hold the cylindrical rollers on the inner sides of the portions surrounded by the two sides in the circumferential direction of the pillars and the axially inner sides of the rims. It is said. And each said pillar part is arrange | positioned in the state which shifted in any direction with respect to the radial direction with respect to the pitch circle | round | yen of each said cylindrical roller, and the space | interval of each said pillar parts adjacent to the circumferential direction is said each cylinder. The diameter is smaller than the roller diameter.

In particular, in the cylindrical roller bearing of the present invention, it is formed at the center portion of each pocket in the circumferential direction of the cage on the axial inner surface of at least one of the rim portions. Based on the engagement between the convex portion and the concave portion formed in the central portion of the axial end surface of each cylindrical roller, each cylindrical roller held in each pocket is connected to each column in the radial direction of the cage. This prevents the portion from slipping out in the direction opposite to the direction in which the portion is displaced with respect to the pitch circle.
When the cylindrical roller bearing of the present invention having such characteristics is implemented, preferably, as described in claim 2, the shaft of the peripheral surface of the rotating wheel that rotates during use, of the outer ring and the inner ring. At the end of the direction, a flange that protrudes in the radial direction toward the stationary wheel that does not rotate during use is provided over the entire circumference. At the same time, the radial position of the cage is regulated by the engagement between the circumferential surface of the flange and the circumferential surface of the axial end portion of the cage.
In order to carry out the present invention, preferably, as described in claim 3, the cylindrical roller bearing is used by being incorporated in a rotation support portion of a speed increaser for a wind power generator.

  In the case of the cylindrical roller bearing of the present invention configured as described above, each cylindrical roller held in each pocket of the cage in a state where there is no outer ring and inner ring is the cage with respect to the radial direction of the cage. It is possible to prevent each of the column portions that are configured from slipping out in a direction that is shifted from the pitch circle of each of the cylindrical rollers based on the presence of these column portions. On the other hand, slipping out in the direction opposite to the offset direction is formed at the central portion of the axial end surface of each cylindrical roller and the convex portion formed on the axial inner surface of the rim portion constituting the cage. This can be prevented based on the engagement with the recessed portion. For this reason, the outer ring and the inner ring are separated before assembling at the place of use (for example, during transportation), and the respective cylindrical rollers are pulled out in the axial direction from the radially inner side of the outer ring or the radially outer side of the inner ring. Even when this occurs, it is possible to effectively prevent the occurrence of a problem that the cylindrical rollers are dropped from the pockets in the radial direction. That is, in the case of the present invention, it is not necessary to prevent the outer ring and the inner ring from being separated in order to prevent such a problem from occurring. Therefore, it is not necessary to provide the above-mentioned locking groove and retaining ring as means for preventing this separation. As a result, it is possible to reduce the number of parts and the cost. In addition, since the outer ring and the inner ring can be separated, it is possible to improve the handleability such that the outer ring and the inner ring can be separately assembled to the rotation support part and combined with the rotation support part. it can.

  Further, when the present invention is implemented, if the configuration described in claim 2 is adopted, the frictional force (driving force) in the rotational direction is applied from the circumferential surface of the collar portion of the rotating wheel to the circumferential surface of the axial end portion of the cage. Force). For this reason, when the cylindrical roller bearing described in claim 2 is used by being incorporated in a rotation support portion of a wind power generator, for example (claim 3), that is, revolving slip (track) Even when used under conditions where slippage between the surface and the rolling surface is likely to occur, the occurrence of the revolution slip can be suppressed by the frictional force in the rotational direction. Accordingly, it is possible to prevent damage such as skidding and smearing from occurring on the surfaces of the outer ring, the inner ring, and the cylindrical rollers.

[First example of embodiment]
1 to 3 show a first example of an embodiment of the present invention. The feature of this example is that the engaging portions between the axially opposite end surfaces of the respective cylindrical rollers 3a and 3a and the axially inner side surfaces of the pair of rim portions 9a and 9a constituting the retainer 4a. In the structure. Since the structure and operation of the other parts are the same as in the case of the conventional structure shown in FIGS. 10 to 11 described above, the same parts are denoted by the same reference numerals, and redundant description is omitted or simplified. The description will focus on the features of this example.

  In the case of this example, circular recesses 14 and 14 are respectively formed in the central portions of the axial end surfaces of the cylindrical rollers 3a and 3a. Each of the recesses 14 and 14 is formed by forging when the cylindrical rollers 3a and 3a are manufactured. Further, at the radially outer end portions of the inner side surfaces in the axial direction of the rim portions 9a, 9a, in the circumferential direction, the recesses 14, 14 are respectively formed in the central portions of the pockets 11, 11 of the retainer 4a. The convex parts 15 and 15 which engage are formed. Each of these convex portions 15 and 15 is formed by pressing the meat of the portion inward in the axial direction based on pressing the axially inner end portions of the outer peripheral surfaces of the rim portions 9a and 9a. is doing. Each of the convex portions 15 and 15 engages with the concave portions 14 and 14 in a manner that does not hinder the rolling of the cylindrical rollers 3a and 3a. The rollers 3a and 3a are prevented from coming out radially outward from the pockets 11 and 11 of the cage 4a.

In order to the way to obtain such a effect, in the case of this example, each of the cylindrical rollers 3a, 3a of the length and L _3a, present in both axial end faces of the respective cylindrical rollers 3a, 3a The distance between the bottom surfaces of the recesses 14 and ₁₄ is W _14, and the distance between the inner surfaces in the axial direction of the rim parts 9 a and 9 a is W _9a, and is present at both axial ends of the pockets 11 and 11. the spacing of the distal ends of the respective convex portions 15, 15 when the W ₁₅ is the dimensional relationship of _{W 14 <W 15 <L 3a} <W 9a is in the manner established. In the case of this example, the cylindrical rollers 3a and 3a are held in the pockets 11 and 11 by being pushed into the pockets 11 and 11 from the radially outer side of the retainer 4a. During the pushing operation, each of the convex portions 15 and 15 is guided to a chamfered portion 16 having a convex curved surface that exists in a continuous portion between the outer peripheral surface of each cylindrical roller 3a and 3a and both end surfaces in the axial direction. While elastically deforming outward in the axial direction, the cylindrical rollers 3a and 3a are allowed to pass. Then, the cylindrical rollers 3a, 3a are elastically restored in a state of being accommodated in the pockets 11, 11, and are engaged with the recesses 14, 14, so that the cylindrical rollers 3a, 3a The radial outward displacement of the cage 4a is limited.

  As described above, in the case of the cylindrical roller bearing of this example, the convex portions 15 and 15 formed on the inner side surface in the axial direction of the pair of rim portions 9a and 9a constituting the cage 4a, and the cylindrical rollers 3a. The cylindrical rollers 3a and 3a held in the pockets 11 and 11 based on the engagement with the concave portions 14 and 14 formed at the central portions of the axially opposite end faces of 3a are arranged in the radial direction of the cage 4a. It can be prevented from slipping out. On the other hand, slipping out inward in the radial direction can be prevented based on the presence of the pillar portions 10 and 10 constituting the retainer 4a as in the case of the conventional structure shown in FIGS. For this reason, the outer ring 1 and the inner ring 2 are separated before assembling at the place of use (for example, during conveyance), and the cylindrical rollers 3a and 3a are either radially inward of the outer ring 1 or radially outward of the inner ring 2. Even when such a situation occurs that the cylindrical rollers 3a and 3a come out in the axial direction, it is possible to effectively prevent the occurrence of a problem that the cylindrical rollers 3a and 3a are dropped from the pockets 11 and 11 in the radial direction. That is, in the case of this example, it is not necessary to prevent separation of the outer ring 1 and the inner ring 2 in order to prevent such a problem from occurring. Therefore, there is no need to provide the locking groove 12 and the retaining ring 13 (see FIG. 10) as described above, which are means for preventing this separation. As a result, it is possible to reduce the number of parts and the cost. Even if the outer ring 1 and the inner ring 2 are separated, the retainer 4a and the cylindrical rollers 3a and 3a are not separated. And the inner ring 2 can be separated. For this reason, handleability can be improved.

  In the case of this example, the engagement between the outer peripheral surfaces of the flanges 8 and 8 constituting the inner ring 2 and the inner peripheral surfaces of both axial ends of the cage 4a (the two peripheral surfaces are in sliding contact or The radial position of the retainer 4a is regulated by making it face and face each other. For this reason, in use, a frictional force (driving force) in the rotational direction acts on the inner peripheral surfaces of both end portions in the axial direction of the cage 4a from the outer peripheral surfaces of the flanges 8 and 8 of the inner ring 2 which is a rotating wheel. For this reason, when the cylindrical roller bearing of this example is used by being incorporated in a rotating support portion of a wind power generator, for example, a no-load / high-speed rotation, a revolution slip (track and rolling surface and Even when used under conditions where slippage is likely to occur, the revolution slip can be suppressed by the driving force in the rotational direction. Accordingly, it is possible to prevent damages such as skidding and smearing from occurring on the surfaces of the outer ring 1, the inner ring 2, and the cylindrical rollers 3a and 3a.

[Second Example of Embodiment]
4 to 6 show a second example of the embodiment of the present invention. In the case of this example, the height dimension in the radial direction of the pair of rim portions 9b, 9b constituting the retainer 4b is made larger than the height dimension in the radial direction of the column portions 10 and 10. The cylindrical rollers 3a and 3a are respectively provided in the center portions of the pockets 11 and 11 of the cage 4b in the circumferential direction at the radially inner end edges of the inner side surfaces in the axial direction of the rim portions 9b and 9b. The circular convex parts 15a and 15a for engaging with the concave parts 14 and 14 formed in the both axial end surfaces are formed. In the case of this example, each of the convex portions 15a and 15a is formed by pressing a part of the rim portions 9b and 9b from the outside in the axial direction toward the inside in the axial direction by plastic deformation of the portions. is doing. Other configurations and operations are the same as those in the first example of the embodiment described above.
In the first and second examples of the above-described embodiment, the present invention is applied to an NF type cylindrical roller bearing. However, the present invention replaces the NF type cylindrical roller bearing with an N type cylindrical roller bearing. It can also be implemented.

[Third example of embodiment]
7 to 9 show a third example of the embodiment of the present invention. In this example, the outer ring 1a is a rotating wheel and the inner ring 2a is a stationary wheel. And the collar parts 6 and 6 are provided in the axial direction both ends of the inner peripheral surface of this outer ring | wheel 1a, and the collar part 8 is provided in the axial direction one end part (left end part of FIG. 7, 9) of the said outer ring | wheel 2a. ing. Further, as the retainer 4c, a retainer having a structure in which the retainer 4a of the first example of the embodiment shown in FIGS. That is, in the case of this example, the cage 4c is engaged by the engagement between the inner circumferential surface of the pair of flanges 6 and 6 provided on the outer ring 1a and the outer circumferential surface of both axial ends of the cage 4c. The radial position is regulated. Further, the column portions 10a and 10a constituting the cage 4c are arranged in a state of being shifted radially outward with respect to the pitch circle of the cylindrical rollers 3a and 3a. At the same time, the interval between the column portions 10a, 10a adjacent in the circumferential direction is made smaller than the diameter of the cylindrical rollers 3a, 3a. Further, at the radially inner end edge of the axially inner side surface of both the rim portions 9c, 9c, the cylindrical rollers 3a, Convex portions 15b and 15b are formed to be engaged with the concave portions 14 and 14 formed on both axial end surfaces of 3a.

In the case of the cylindrical roller bearing of the present example configured as described above, the cylindrical portions 3a and 3a are moved from the pockets 11a and 11a to the outside of the cage 4c in the radial direction by the column portions 10a and 10a. Can be prevented. At the same time, the engagement between the concave portions 14 and 14 and the convex portions 15b and 15b can prevent the cylindrical rollers 3a and 3a from coming out radially inward from the pockets 11a and 11a. Other configurations and operations are the same as those in the first example of the embodiment shown in FIGS.
In the third example of the above-described embodiment, the present invention is applied to an NJ type cylindrical roller bearing. However, in the present invention, this NJ type cylindrical roller bearing is replaced with an NU type or NUP type cylindrical roller bearing. It can also be carried out in place of a bearing.

  In the third example of the embodiment described above, the cage has a structure that is the same as the cage 4a of the first example of the embodiment shown in FIGS. It was adopted. However, when carrying out the present invention, a cage having a structure in which the cage 4b of the second example of the embodiment shown in FIGS. You can also do it. Further, in each of the above-described embodiments, the engaging portion between the convex portion formed on the inner surface in the axial direction of the rim portion constituting the cage and the concave portion formed on the axial end surface of the cylindrical roller is used as the shaft of each pocket. A configuration provided on both sides in the direction was adopted. However, when implementing this invention, the structure which provides the engaging part of the said convex part and a recessed part only in the axial direction one side of each said pocket can also be employ | adopted. There are various types of cylindrical roller bearings, such as NF type and NJ type, depending on the manner in which the flanges are provided on the bearing ring. However, when the present invention is carried out, it is described in the claims. As long as the above requirements are satisfied, various types of cylindrical roller bearings can be used.

Sectional drawing which shows the 1st example of embodiment of this invention. The figure seen from the right side of FIG. 1 shown in the state which cut | disconnected a part. The principal part enlarged view of FIG. Sectional drawing which shows the 2nd example of embodiment of this invention. The figure seen from the right side of FIG. 4 shown in the state which cut | disconnected a part. The principal part enlarged view of FIG. Sectional drawing which shows the 3rd example of embodiment of this invention. The figure seen from the right side of FIG. 7 shown in the state which cut | disconnected a part. The principal part enlarged view of FIG. Sectional drawing which shows an example of a conventional structure. The figure seen from the right side of Drawing 10 shown in the state where a part was cut.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a Outer ring 2, 2a Inner ring 3, 3a Cylindrical roller 4, 4a-4c Cage 5 Outer ring raceway 6 Gutter part 7 Inner ring raceway 8 Gutter part 9, 9a-9c Rim part 10, 10a Pillar part 11, 11a Pocket 12 Engagement Retaining groove 13 Retaining ring 14 Recessed portion 15, 15a, 15b Convex portion 16 Chamfered portion

Claims (3)

  An outer ring provided with a cylindrical outer ring raceway in the axially intermediate portion of the inner peripheral surface, an inner ring provided with a cylindrical inner ring raceway in the axially intermediate portion of the outer peripheral surface, and between the inner ring raceway and the outer ring raceway A plurality of cylindrical rollers provided so as to be capable of rolling, and cages for holding the respective cylindrical rollers so as to be capable of rolling, and the cages are arranged at both ends in the axial direction, each of which is a circle. It is composed of a pair of rim portions that are annular and a plurality of pillar portions that are arranged at equal intervals in the circumferential direction, and that both end portions are continuous with the axially inner side surfaces of both rim portions, The part surrounded by the two sides in the circumferential direction of each pillar part and the inner side surface in the axial direction of both rim parts is a plurality of pockets that hold the cylindrical rollers in a freely rollable manner inside each part. And, each of the column parts is related to the pitch circle of each cylindrical roller with respect to the radial direction. In the cylindrical roller bearing, the rims are arranged in a state shifted in either direction and the interval between the column portions adjacent in the circumferential direction is smaller than the diameter of the cylindrical rollers. On the inner surface in the axial direction of at least one rim part of the parts, with respect to the circumferential direction of the cage, on the central part of the axial end surface of each cylindrical roller and the convex part formed at the central part of each pocket Based on the engagement with the formed recess, the cylindrical rollers held in the pockets are in a direction opposite to the direction in which the pillars are displaced from the pitch circle with respect to the radial direction of the cage. Cylindrical roller bearing characterized by preventing slipping out.   Of the outer ring and the inner ring, a flange that protrudes in the radial direction toward the stationary ring that does not rotate during use is provided over the entire circumference at the axial end of the peripheral surface of the rotating ring that rotates during use. The cylindrical roller bearing according to claim 1, wherein the radial position of the cage is regulated by the engagement between the circumferential surface of the portion and the circumferential surface of the axial end portion of the cage.   The cylindrical roller bearing according to any one of claims 1 to 2, wherein the cylindrical roller bearing is used by being incorporated in a rotation support portion of a wind power generator.

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