JP2013072478A - Cage of roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cage of a roller bearing capable of extending the service life of the bearing.SOLUTION: A column part 15a provided in the cage includes a pair of inclined parts 26a and 26b slantingly extending to the rotational axis direction of the cage. Side wall surfaces of a pocket in the pair of inclined parts 26a and 26b have areas of extending along the rotational axis direction of the cage, that are, roller guide parts 35a and 35b for guiding a roller. Outer diameter surfaces 46a and 46b of the inclined parts 26a and 26b constitute recessed parts 43a and 43b recessed to the inner diameter side more than outer diameter surfaces 42a and 42b of extending parts 27a and 27b.

Description

  The present invention relates to a cage for roller bearings (hereinafter sometimes simply referred to as “cage”).

  As a cage for a roller bearing used for an idler of an automobile transmission or a large end of a connecting rod (connecting rod) of a motorcycle engine, there is an M-shaped cage having a substantially M-shaped cross section. The M-type cage has a so-called flange portion, and in the column portion located between the pockets that accommodate the rollers, the central portion in the direction of the rotation axis of the cage is more than the both ends in the direction of the rotation axis of the cage. The shape is recessed toward the inner diameter side.

  Here, a technique relating to a cage having such a shape is disclosed in JP-A-11-101242 (Patent Document 1), JP-A-11-101243 (Patent Document 2), JP-A-11-101244 (Patent Document). 3), and Japanese Patent Application Laid-Open No. 2004-353809 (Patent Document 4).

  According to Patent Document 1, in order to improve the durability and strength of the cage, with respect to the connection radius R between the inner diameter side portion of the pocket wall surface of the cage and the inner surface of the annular portion, the diameter Dr of the needle roller A needle roller bearing having a predetermined relationship is disclosed. According to Patent Document 2, the inner diameter (diameter) D1 of the annular portion of the cage is the inscribed circle diameter D0 of the needle roller, the diameter of the needle roller from the viewpoint of improving the flowability of the lubricating oil and the dischargeability of the contamination. A needle roller bearing set to a value having a predetermined relationship with Dr is disclosed. According to Patent Document 3, a needle roller bearing is disclosed in which an inner surface of a portion protruding from the inner diameter side of the annular portion of the cage is inclined inward toward the outer diameter side. Yes. According to Patent Document 4, from the viewpoint of weight reduction of the cage of the needle roller bearing, a large load is applied by setting the thickness of the reduced diameter portion of the cage to be less than the thickness of the guide surface and the flange portion of the annular portion. A needle roller bearing that secures the thickness of the part and achieves both high strength and high speed has been disclosed.

JP-A-11-101242 JP-A-11-101243 JP-A-11-101244 JP 2004-353809 A

  In recent years, bearings are often used in harsh environments such as a dilute lubrication environment with little lubricating oil. And even in such a harsh environment, there is a demand for extending the life of the bearing. Here, even when the bearings disclosed in Patent Documents 1 to 4 described above are used, due to the influence of a decrease in lubricity due to oil film breakage in the region between the side wall surfaces of the pockets, etc. In some cases, it is not possible to meet the demand for longer life.

  An object of the present invention is to provide a roller bearing retainer capable of extending the life of the bearing.

  The cage of the roller bearing according to the present invention includes a pair of annular portions and a plurality of column portions that connect the pair of annular portions so as to form a pocket that accommodates the rollers. In a cross section cut along a plane parallel to the rotation axis of the cage and including the rotation axis, the column portion is provided with a pair of inclined portions extending obliquely with respect to the direction of the rotation axis of the cage and the rotation axis of the cage. A pair of extending portions that extend inward from the pair of annular portions along the inner side and that are respectively connected to the pair of inclined portions at the end on the inner side. The pair of inclined portions extends toward the inner diameter side than the pair of extending portions. The side wall surfaces of the pockets in the pair of inclined portions are regions extending along the rotation axis direction of the cage, and have roller guide portions that guide the rollers. Here, the outer diameter surface of the inclined portion is provided with a recess that is recessed toward the inner diameter side with respect to the outer diameter surface of the extending portion.

  By comprising in this way, since the recessed part provided in the outer-diameter surface of the inclination part is a shape dented rather than the outer-diameter surface of the extension part, the oil permeability of the lubricating oil in this recessed part improves. If it does so, lubricating oil can be supplied smoothly in the area | region between the side wall surface locations of a pocket, and an oil film can be formed appropriately. Therefore, the lubricity at the contact portion with the side wall surface of the pocket is improved, the roller can be smoothly rolled, and the wear of the roller guide portion and the roller of the cage can be reduced. As a result, the life of the bearing can be extended. Here, the roller guide portion is a region corresponding to a portion where the roller PCD is located on the side wall surfaces of the pair of inclined portions.

  Here, the recess may be provided so that the region located on the outermost diameter side of the inclined portion is recessed toward the inner diameter side. By comprising in this way, the oil permeability of the lubricating oil from the outer diameter side can be improved at the position where the inclined portion is provided.

  Further, in the cross section cut along a plane parallel to the rotation axis of the cage and including the rotation axis, the concave portion may be constituted by a line parallel to the rotation axis of the cage. By comprising in this way, a recessed part can be provided in a comparatively wide area | region, and the oil permeability of lubricating oil can be improved more.

  Further, in a cross section cut by a plane parallel to the rotation axis of the cage and including the rotation axis, a surface extending in a direction perpendicular to the rotation axis of the cage is provided between the extension portion and the recess. May be. By comprising in this way, the oil permeability of the lubricating oil supplied from the side in which the extension part was provided can be improved.

  Moreover, chamfering is made at the corner portion of the end portion in the rotation axis direction of the cage in the roller guide portion. By comprising in this way, the oil permeability of the lubricating oil from the edge part side of a roller guide part can be improved, and abrasion of the roller guide part and roller of a cage can be reduced more. Further, the chamfering may be R chamfering. By doing so, the oil permeability of the lubricating oil from the end side of the roller guide portion can be improved more reliably, and the wear of the roller guide portion and the roller of the cage can be further reduced.

  As a preferred embodiment, in a cross section cut by a plane that is parallel to the rotation axis of the cage and includes the rotation axis, the column portion connects the inner ends of the pair of inclined portions. And a connecting portion extending along the rotation axis of the cage. Such a cage is a so-called M-type cage and can improve the strength of the cage.

  Further, in the cross section cut by a plane parallel to the rotation axis of the cage and including the rotation axis, the thickness of the region including the roller guide portion in the inclined portion is at least one of the extension portion and the connection portion. It may be thicker than the wall thickness.

  Thus, by increasing the thickness of the region including the roller guide portion in the inclined portion, the roller guide portion region extending in the rotation axis direction of the cage is lengthened, and the skew angle of the roller accommodated in the pocket is increased. Can be reduced. Moreover, the rigidity of the part which a roller contacts can be made high. Therefore, the life of the bearing can be further extended.

  Further, in a cross section cut by a plane parallel to the rotation axis of the cage and including the rotation axis, the thickness of the region including the roller guide portion in the inclined portion is larger than the thickness of both the extending portion and the connecting portion. It may be thicker.

  Even with such a configuration, it is possible to further extend the life of the bearing.

  By comprising in this way, since the recessed part provided in the outer-diameter surface of the inclination part is a shape dented rather than the outer-diameter surface of the extension part, the oil permeability of the lubricating oil in this recessed part improves. If it does so, lubricating oil can be supplied smoothly in the area | region between the side wall surface locations of a pocket, and an oil film can be formed appropriately. Therefore, the lubricity at the contact portion with the side wall surface of the pocket is improved, the roller can be smoothly rolled, and the wear of the roller guide portion and the roller of the cage can be reduced. As a result, the life of the bearing can be extended.

It is a perspective view which shows the retainer of the roller bearing which concerns on one Embodiment of this invention. It is the figure which looked at some cages of the roller bearing which concerns on one Embodiment of this invention from the internal diameter side. It is a schematic sectional drawing which shows a part of cage | basket of the roller bearing which concerns on one Embodiment of this invention, and is equivalent to the cross section cut | disconnected by the plane which is parallel to the rotating shaft line of a cage and contains the rotating shaft line of a cage. It is a schematic sectional drawing which shows a part of cage | basket of the roller bearing which concerns on one Embodiment of this invention, and is equivalent to the cross section cut | disconnected by the plane which is parallel to the rotating shaft line of a cage and contains the rotating shaft line of a cage. It is a schematic sectional drawing which shows a part of retainer of the roller bearing which concerns on one Embodiment of this invention, and is equivalent to the case where it sees from the rotating shaft direction of a retainer. It is a schematic sectional drawing which shows a part of cage of the needle roller bearing which concerns on one Embodiment of this invention, and is an enlarged view of the area | region shown by VI shown by the dashed-two dotted line in FIG. It is a figure which expands and shows a part of retainer of the needle roller bearing which concerns on one Embodiment of this invention, and is equivalent to the figure seen from the direction shown by the arrow VII in FIG. It is a schematic sectional drawing which shows a part of cage of the roller bearing which concerns on other embodiment of this invention. It is a schematic sectional drawing which shows a part of cage of the roller bearing which concerns on other embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a cage of a needle roller bearing according to an embodiment of the present invention. FIG. 2 is a view of a part of the cage of the needle roller bearing according to the embodiment of the present invention as viewed from the inner diameter side. 3 and 4 are schematic cross-sectional views showing a part of the cage of the needle roller bearing according to one embodiment of the present invention, including a rotation axis of the cage that is parallel to the rotation axis of the cage. It corresponds to a cross section cut along a plane. 3 is a cross-sectional view taken along the III-III cross section shown in FIG. 2, and is a cross-sectional view in the region where the pocket is provided. FIG. 4 is a cross-sectional view taken along the IV-IV cross section shown in FIG. It is sectional drawing in the area | region where the pillar part was provided. FIG. 5 is a schematic cross-sectional view showing a part of the cage of the needle roller bearing according to the embodiment of the present invention, and corresponds to a case when viewed from the rotation axis direction of the cage. FIG. 5 shows a case of cutting along the VV section shown in FIG. From the viewpoint of easy understanding, FIG. 3 shows one arbitrary pocket 14d. From the viewpoint of easy understanding, in FIGS. 3 and 4, a roller PCD (Pitch Circle Diameter) which is the diameter of the pitch circle of the needle rollers is indicated by a one-dot chain line, and in FIGS. 1 to 3, The rotation axis is indicated by a two-dot chain line. Further, from the viewpoint of easy understanding, in FIG. 4, the needle rollers accommodated in the pockets are indicated by dotted lines.

  1 to 5, a needle roller bearing retainer 11 according to an embodiment of the present invention is provided at an idler of an automobile transmission, a large end portion of a connecting rod (connecting rod) of a motorcycle engine, or the like. Used. The cage 11 holds a plurality of needle rollers 13. The cage 11 holding the needle roller 13 receives a radial load as a roller with cage. When used as a bearing, lubricating oil is appropriately supplied.

  The retainer 11 includes a plurality of column portions 15a that connect the pair of annular portions 12a, 12b so as to form a pair of annular portions 12a, 12b and a plurality of pockets 14a, 14b, 14c that accommodate the needle rollers 13. , 15b, 15c. As shown in FIG. 2 and the like, a plurality of pockets 14a, 14b, and 14c are provided at intervals in the circumferential direction that is the vertical direction of the paper surface in FIG. In other words, the pillar portion 15a is arranged between the pocket 14a and the pocket 14b provided at a predetermined interval in the circumferential direction. The cage 11 stores and holds the needle rollers 13 one by one in each of the plurality of pockets 14a, 14b, 14c.

  One annular portion 12a includes a cylindrical flange portion 21a extending from one end of the rotation axis 16 of the cage 11 indicated by a two-dot chain line toward the inner diameter side, and one direction of the rotation axis 16 of the cage 11. It is a structure provided with the cylindrical annular part 22a extended in the other cyclic | annular part 12b side which opposes from the edge part side. Of the flange 21a, a chamfer 23a is provided at a corner on the outer side of the bearing at the end on the inner diameter side. Further, a chamfer 24a is provided at a corner portion on the inner side of the bearing at the end portion on the inner diameter side of the flange portion 21a. Both of these chamfers 23a and 24a are so-called C chamfers. Similarly, the other annular portion 12b includes a cylindrical flange portion 21b and a cylindrical annular portion 22b. And also in the collar part 21b, the chamfers 23b and 24b are given like the collar part 21a. A region between the annular portion 22a and the annular portion 22b in the direction of the rotation axis 16 of the cage 11 is a column portion 15a.

  Next, the structure of the column part 15a is demonstrated. The plurality of column portions 15a, 15b, and 15c provided in the cage 11 have the same shape, and will be basically described based on the column portion 15a provided between the pocket 14a and the pocket 14b.

  As shown in FIG. 3, the column portion 15 a is inclined with respect to the direction of the rotation axis 16 of the cage 11 in a cross section cut by a plane parallel to the rotation axis 16 of the cage 11 and including the rotation axis 16. A pair of inclined portions 26a, 26b extending inward, and a pair of inclined portions 26a, 26b extending inward from the pair of annular portions 12a, 12b along the rotation axis 16 of the retainer 11, respectively. A pair of extending portions 27a and 27b that are continuous with each other, and a connecting portion 28a that extends along the rotation axis 16 of the cage 11 so as to connect the inner ends of the pair of inclined portions 26a and 26b. Including. Specifically, the inner side of the annular part 22a and the outer side of the extension part 27a are connected, and the inner side of the annular part 22b and the outer side of the extension part 27b are connected. . And a pair of inclination part 26a, 26b is a shape extended toward the internal-diameter side of a pair of extension part 27a, 27b. That is, the cage 11 is a so-called M-type cage. Such an M-type cage has a high cage rigidity. Here, the inner side means the inner side of the so-called cage.

  The roller PCD 17 indicated by a two-dot chain line in FIG. 3 or the like is located in a region where the pair of inclined portions 26a and 26b are provided in the radial direction, and in the direction of the rotation axis 16 of the cage 11 which is the left-right direction in FIG. It extends. The portions of the pair of inclined portions 26a and 26b where the roller PCD 17 is located serve as roller guide portions 35a and 35b that are contact portions between the needle rollers 13 accommodated in the pocket 14b and the side wall surface 31a of the pocket 14b.

  In the pocket 14b that accommodates the needle roller 13, the circumferential interval between the connecting portions 28a and 28b of the adjacent column portions 15a and 15b across the pocket 14b is the inclined portions 26a and 26c in the adjacent column portions 15a and 15b. It is narrower than the circumferential interval between them and the circumferential interval between the inclined portions 26b, 26d. Specifically, the circumferential interval between the side wall surface 34a of the connecting portion 28a of the column portion 15a and the side wall surface 34b of the connecting portion 28b of the column portion 15b is equal to the side wall surface 32a and the column portion of the inclined portion 26a of the column portion 15a. The circumferential distance between the inclined portion 26a of the 15b and the side wall surface 32c and the circumferential distance between the side wall 32b of the inclined portion 26b of the column portion 15a and the side wall surface 32d of the inclined portion 26b of the column portion 15b are smaller. ing. The connecting portions 28a, 28b located on the innermost diameter side of the pillar portions 15a, 15b are prevented from falling off to the inner diameter side of the needle rollers 13 accommodated in the pocket 14b, 29b.

  On the outer diameter side, the circumferential interval between the extending portions 27a and 27c of the column portions 15a and 15b adjacent to each other across the pocket 14b and the circumferential interval between the extending portions 27b and 27d are adjacent to each other. It is narrower than the interval between the inclined portions 26a and 26c in the column portions 15a and 15b and the interval between the inclined portions 26b and 26d in the circumferential direction. Specifically, the circumferential distance between the side wall surface 33a of the extension portion 27a of the column portion 15a and the side wall surface 33c of the extension portion 27c of the column portion 15b, and the side wall surface 33b of the extension portion 27b of the column portion 15a. And the circumferential distance between the side wall surface 33d of the column portion 15b and the side wall surface 33d of the column portion 15b are both in the circumferential direction between the side wall surface 32a of the inclined portion 26a of the column portion 15a and the side wall surface 32c of the inclined portion 26a of the column portion 15b. The interval is narrower than the interval in the circumferential direction between the side wall surface 32b of the inclined portion 26b of the column portion 15a and the side wall surface 32d of the inclined portion 26b of the column portion 15b. And extension part 27a, 27b, 27c, 27d located in the outermost diameter side of this pillar part 15a, 15b prevents the needle roller 13 accommodated in the pocket 14b from dropping out to the outer diameter side. It becomes the outer diameter side roller stoppers 30a and 30b. Here, the side wall surfaces 32a, 32b, 33a, 33b, and 34a are collectively referred to as the side wall surface 31a on the column portion 15a side of the pocket 14b.

  As shown in FIG. 2 and the like, the side wall surface 32a of one inclined portion 26a is flat in the direction of the rotation axis 16 of the cage 11. That is, when the cage 11 is viewed from the radial direction, the side wall surface 32 a of the inclined portion 26 a is represented by a straight line along the direction of the rotation axis 16 of the cage 11. The side wall surface 32b of the other inclined portion 26b has the same shape. That is, when the cage 11 is viewed from the radial direction, the side wall surface 32b of the inclined portion 26b is flat.

  Next, the detailed structure of the column part 15a is demonstrated. 6 is a schematic sectional view showing a part of the cage 11 of the needle roller bearing according to one embodiment of the present invention, and is an enlarged view of a region indicated by VI indicated by a three-dot chain line in FIG. . FIG. 7 is an enlarged view showing a part of the retainer 11 of the needle roller bearing according to the embodiment of the present invention, and corresponds to a view seen from the direction indicated by the arrow VII in FIG. In FIG. 7, the vertical direction of the paper is the circumferential direction. Specifically, the upper side of the paper surface is the side where the pocket 14b is located, and the lower side of the paper surface is the side where the column portion 15a is located.

1 to 7, the inclination direction of the inclined portion 26 a is the direction indicated by the arrow D ₁ in FIG. 6 or the opposite direction, and is an angle θ with respect to the rotation axis 16 of the cage 11. Inclined. The roller guide portion 35a in one inclined portion 26a is a region from the outer diameter surface 41a to the inner diameter surface 47a in the inclined portion 26a, and is a portion indicated by a region from the point 36a to the point 36b in FIG. . The bus bar shape in the roller guide portion 35a is the shape shown in FIG. Further, the roller guide portion 35b in the other inclined portion 26b is a region extending from the outer diameter surface 41b to the inner diameter surface 47b in the inclined portion 26b. In FIG. 6, a portion indicated by a region extending from the point 36c to the point 36d. It is.

  Of the roller guide portion 35a, corners 37a and 37b at both ends in the direction of the rotation axis 16 of the cage 11 are chamfered. This chamfering is an R chamfering. Similarly, the roller guide portion 35b is also chamfered at the corners at both ends in the direction of the rotation axis 16 of the cage 11. This chamfering is also an R chamfering.

  Here, a part of the outer diameter surface 41a of one inclined portion 26a, specifically, here, in the region located on the outermost diameter side, the inner diameter is larger than the outer diameter surface 42a of one extension portion 27a. A recessed portion 43a that is recessed to the side is provided. Further, a part of the outer diameter surface 41b of the other inclined portion 26b, specifically, here, the region located on the outermost diameter side is also on the inner diameter side of the outer diameter surface 42b of the other extension portion 27b. A recessed portion 43b is provided. The configuration of the recess 43b provided in a part of the outer diameter surface 41b of the other inclined portion 27b is basically the same as the configuration of the recess 43b provided in a part of the outer diameter surface 41a of the one inclined portion 26a. Therefore, the description of the configuration of the concave portion 43b provided in a part of the outer diameter surface 41b of the other inclined portion 26b will be omitted below.

  The recessed part 43a is provided so that the area | region located in the outermost diameter side among the inclination parts 26a may be dented in the inner diameter side rather than the outer diameter surface 42a of the extension part 27a. Here, the entire region located on the outermost diameter side is configured to be recessed toward the inner diameter side.

The specific shape is as follows. That is, the outer diameter surface 42 a of the extending portion 27 a extends in parallel with the rotation axis 16 of the cage 11. A surface 44a extending to a predetermined portion 45a in the radial direction of the cage 11, here, a direction perpendicular to the rotation axis 16 of the cage 11 is continuous at the end of the extending portion 27a on the bearing inner side. ing. And in the direction of the rotation axis 16 of the cage 11, it extends parallel to the rotation axis 16 of the cage 11 from the predetermined location 45 a and extends inward of the bearing, and constitutes a part of the outer diameter surface 41 a of the inclined portion 26 a. An outer diameter surface 46a is formed. The outer diameter surface 46a constitutes a recess 43a that is recessed to the inner diameter side with respect to the outer diameter surface 42a of the extending portion 27a. That is, the concave portion 43a is located at the position where the extended portion 27a is provided, specifically, from the surface 44a that is the inner side end of the extended portion 27a to the bearing inner side, here, the arrow D in FIG. ₇ is a configuration provided continuously to the right side of the paper surface in FIG. Further, a surface 44a extending in a direction perpendicular to the rotation axis of the cage 11 is provided between the extending portion 27a and the recessed portion 43a. The outer diameter surface 42a of the extending portion 27a and the outer diameter surface 46a of the inclined portion 26a have a shape having a so-called step in the radial direction.

  That is, with respect to the outer diameter surface 46a constituting the concave portion 43a, the outer diameter surface 42a of the extension portion 27a is not directly used as an extension region extending inward along the rotation axis 16 of the retainer 11, The connecting portion between the extending portion 27a and the inclined portion 26a is a region formed by being recessed toward the inner diameter side. In addition, about the recessed part 43b, it is parallel to the rotating shaft 16 of the holder | retainer 11 from the predetermined location 45b in the direction of the rotating shaft 16 of the holder | retainer 11, and extends inward of a bearing, The outer-diameter surface 41b of the inclined part 26b The outer-diameter surface 46b which comprises a part of this comprises the recessed part 43b dented in the inner diameter side rather than the outer-diameter surface 42b of the extension part 27b.

In the cross section shown in FIG. 6, the recess 43 a is represented by a line parallel to the rotation axis 16 of the cage 11. Here, the outer diameter surface 46a constituting the recess 43a, the length _{L 1} to the inner surface 48a extending in the direction along the rotational axis 16 of the retainer 11 and a part of the inner surface 47a is extending portion 27a it is shorter than the length _{L 2} from the outer diameter surface 42a to the inner diameter surface 49a of. The inner diameter surface 49a of the extending portion 27a and the inner diameter surface 48a of the inclined portion 26a are configured to continue straight in the direction of the rotation axis 16 of the cage 11. For example, when the cage 11 is manufactured from a single plate material, the thickness of the portion corresponding to the outer diameter surface 46a constituting the recess 43a is reduced so that the outer diameter side portion is recessed. It becomes composition. Here, in this embodiment, the length L ₁ is about 4/5 of the length L ₂ . That is, the radial position of the predetermined portion 45a is toward the inner diameter side from the outer diameter surface 42a of the extending portion 27a, which corresponds to about 1/5 the length fraction away of the length L _2.

In this embodiment, the thickness of the inclined portion 26a in the region including the roller guide portion 35a, specifically, the shortest length L ₃ from the outer diameter surface 41a to the inner diameter surface 47a in the inclined portion 26a, and the thickness of the connecting portion 28a, specifically, the outer diameter surface 38a shortest length L ₄ to the inner diameter surface 38b from the connecting portion 28a are both are configured equal to the length L _1. Note that the position and range of the predetermined portion 45a are arbitrarily determined according to the strength of the inclined portion 26a, the oil permeability of the lubricating oil, and the like.

  By comprising in this way, recessed part 43a, 43b provided in a part of outer-diameter surface 41a, 41b of inclined part 26a, 26b was dented rather than outer-diameter surface 42a, 42b of extension part 27a, 27b. Because of the shape, the oil permeability of the lubricating oil in the recesses 43a and 43b is improved. If it does so, in the area | region between the side wall surface 31a of the pocket 14b and the needle roller 13, lubricating oil can be supplied smoothly and an oil film can be formed appropriately. Accordingly, the lubricity at the contact portion between the side wall surface 31a of the pocket 14b and the needle roller 13 is improved, the needle roller 13 can be smoothly rolled, and the roller guide portions 35a, 35b of the cage 11 and Wear of the needle roller 13 can be reduced. As a result, the life of the bearing can be extended.

  In this case, since the recesses 43a and 43b are provided so that the region located on the outermost diameter side of the inclined portions 26a and 26b is recessed toward the inner diameter side, the positions where the inclined portions 26a and 26b are provided. The oil permeability of the lubricating oil from the outer diameter side can be improved.

  Further, in the cross section cut along a plane parallel to the rotation axis 16 of the cage 11 and including the rotation axis 16, that is, in the cross section shown in FIG. 6, the recesses 43 a and 43 b are parallel to the rotation axis 16 of the cage 11. Since it is comprised by the line | wire, the recessed parts 43a and 43b can be provided in a comparatively wide area | region, and the oil permeability of lubricating oil can be improved more.

  Further, in the cross section shown in FIG. 6, the extension portion 27a and the recess portion 43a and the extension portion 27b and the recess portion 43b extend in a direction perpendicular to the rotation axis 16 of the retainer 11, respectively. Since the surfaces 44a and 44b are provided, the oil permeability of the lubricating oil supplied from the side on which the extending portions 27a and 27b are provided can be improved.

  In this case, the recesses 43a and 43b are located on the bearing inward side from the positions where the extension portions 27a and 27b are provided, specifically, the surfaces 44a and 44b that are the inner side ends of the extension portions 27a and 27b. Since they are provided in series, the oil permeability of the lubricating oil supplied from the outer side of the bearing, that is, the side where the extending portions 27a and 27b are provided can be improved.

  Further, in this case, of the roller guide portions 35a and 35b, the corner portions 37a and 37b at both ends in the direction of the rotation axis 16 of the retainer 11 are chamfered, so both ends of the roller guide portions 35a and 35b are formed. The oil permeability of the lubricating oil from the portion side can be improved, and wear of the roller guide portions 35a and 35b and the needle rollers 13 of the cage 11 can be further reduced. Further, since the chamfering is an R chamfering, it is possible to improve the oil permeability of the lubricating oil from both end sides of the roller guide portions 35a and 35b more reliably and the roller guide portions 35a and 35b of the cage 11. In addition, the wear of the needle rollers 13 can be further reduced.

  Here, the thickness of the region including the roller guide portion in the inclined portion may be larger than the thickness of both the extending portion and the connecting portion. FIG. 8 is a cross-sectional view showing a part of the needle roller bearing in this case, and corresponds to the cross section shown in FIG.

  Referring to FIG. 8, the retainer 51 of the needle roller bearing includes a plurality of ring portions 52 a and 52 b that connect the pair of ring portions 52 a and 52 b so as to form a pocket that accommodates the needle rollers 13. The column part 53 is provided. In a cross section taken along a plane parallel to the rotation axis of the cage 51 and including the rotation axis, the column portion 53 includes a pair of inclined portions 54a and 54b extending obliquely with respect to the direction of the rotation axis of the cage 51, and The pair of extending portions 55a and 55b that extend inward from the pair of annular portions 52a and 52b along the rotation axis of the cage 51 and that are continuous with the pair of inclined portions 54a and 54b at the inner end portions, respectively. And a connecting portion 56a extending along the rotation axis of the cage 51 so as to connect the inner ends of the pair of inclined portions 54a, 54b. The pair of inclined portions 54a and 54b extends toward the inner diameter side with respect to the pair of extending portions 55a and 55b. The side wall surfaces of the pockets in the pair of inclined portions 54a and 54b are regions extending along the rotation axis direction of the cage 51, and have roller guide portions 57a and 57b for guiding the needle rollers. The outer diameter surfaces 58a and 58b of the inclined portions 54a and 54b constitute concave portions 60a and 60b that are recessed on the inner diameter side of the outer diameter surfaces 59a and 59b of the extending portions 55a and 55b.

Here, the thickness of the regions 61a and 61b including the roller guide portions 57a and 57b in the inclined portions 54a and 54b in the regions indicated by hatching in FIG. Thicker than the thickness of both. Specifically, the shortest length _{L 5} from each of the outer diameter surface 62a of the area 61a to the inner surface 62b including the guide portion 57a rollers in one of the inclined portion 54a, the outer diameter surface 59a of the extending portion 55a It is configured longer than the minimum length _{L 7} of the length of the shortest to the inner surface 63a _{L 6,} and the outer diameter surface 64a of the connecting portion 56a to the inner surface 64b. The region 61a includes a point 65a positioned on the outermost side of the roller guide portion 57a in the cross section shown in FIG. 8, and extends in a direction perpendicular to the inclination direction of the inclined portion 54a. A line 66b including a point 65b located on the innermost side of the guide portion 57a and extending in a direction perpendicular to the inclination direction of the inclined portion 54a, and a line indicating the outer diameter surface 62a and an inner diameter surface 62b are shown. It is an area surrounded by a line. Similarly, the region 61b including the roller guide portion 57b in the other inclined portion 54b includes a point 65c located on the outermost side of the roller guide portion 57b, and a direction perpendicular to the inclination direction of the inclined portion 54b. 66c, a line 66d including a point 65b located on the innermost side of the roller guide portion 57b, extending in a direction perpendicular to the inclination direction of the inclined portion 54b, and a line indicating the outer diameter surface 62c And an area surrounded by a line indicating the inner surface 62d. The cage 51 shown in FIG. 8 and the cage 11 shown in FIG. 1 and the like differ only in the thickness of the regions 61a and 61b including the roller guide portions 57a and 57b in the pair of inclined portions 54a and 54b. The other basic configuration of is the same as the cage 11 shown in FIG.

  Thus, by increasing the thickness of the regions 61a and 61b including the roller guide portions 57a and 57b in the inclined portions 54a and 54b, the regions of the roller guide portions 57a and 57b extending in the rotation axis direction of the cage 51 are lengthened. Thus, the skew angle of the needle rollers accommodated in the pocket can be reduced. Moreover, the rigidity of the part which a needle roller contacts can be made high. Therefore, the life of the bearing can be further extended.

  In the embodiment shown in FIG. 8, the thickness of the region including the roller guide portion in the pair of inclined portions is configured to be thicker than the thickness of both the pair of extending portions and the connecting portion. However, the thickness may be greater than the thickness of at least one of the extension portion and the connection portion.

Further, in the above embodiment, the dimensions such as the length L _{1 ~} length L _7, depending on the required characteristics and manufacturing processes, such as the cage, and can be set arbitrarily. In addition, the structure which forms a recessed part only in one side among a pair of inclination parts may be sufficient.

  In the above embodiment, the concave portion is provided so that the entire surface of the inclined portion located closest to the outer diameter side is recessed toward the inner diameter side from the outer diameter surface of the extension portion. But. However, the present invention is not limited thereto, and the entire outer diameter surface of the inclined portion, that is, a portion extending along the inclined direction may be included so as to be recessed toward the inner diameter side. Specifically, for example, the plate thickness of the portion corresponding to the inclined portion may be entirely shorter than the plate thickness of the portion corresponding to the extending portion. By doing so, the oil permeability of the lubricating oil is improved over the entire surface of the inclined portion, and the needle rollers can be smoothly rolled.

  Furthermore, a configuration as shown in FIG. 9 may be used. FIG. 9 is an enlarged cross-sectional view showing an enlarged part of a column portion of a cage of a needle roller bearing according to still another embodiment of the present invention, and corresponds to a part of the cross section shown in FIG. To do. Referring to FIG. 9, a pillar portion 72 included in a cage 71 according to still another embodiment of the present invention includes an inclined portion 73 that extends obliquely with respect to the rotation axis direction of the cage 71, and a cage 71. An extending portion 74 that extends inward from the annular portion along the rotation axis of the inner portion and continues to the inclined portion 73 at the inner end. The side wall surface of the pocket in the inclined portion 73 is a region extending along the rotational axis direction of the cage 71 and has a roller guide portion 75 that guides the rollers. The outer diameter surface 76 of the inclined portion 73 is provided with a recess 78 that is recessed toward the inner diameter side with respect to the outer diameter surface 77 of the extending portion 74. The concave portion 78 is provided continuously from the position where the extending portion 74 is provided to the bearing inner side. Here, a convex portion 79 that protrudes relative to the concave portion 78 is provided continuously from the position where the concave portion 78 is provided to the inner side of the bearing. The radial position of the outer diameter surface 80 of the convex portion 79 is configured to be equal to the radial position of the outer diameter surface 77 of the extending portion 74. That is, the inclined portion 73 is configured such that the thickness is reduced not only on the entire surface of the region located on the outermost diameter side but only on the position where the concave portion 78 which is a part of the surface is provided. You may comprise in this way.

  Further, in the embodiment shown in FIG. 9, the concave portion is provided continuously from the position where the extending portion is provided to the bearing inner side. However, the present invention is not limited to this, and the extending portion is provided. It does not have to be continuous from the position to the inside of the bearing. That is, the positional relationship between the concave portion and the convex portion is reversed in the direction of the rotation axis of the cage, and the so-called inclined portion is formed in a predetermined region from the extending portion toward the inner side of the bearing. The thickness may be equal to the thickness of the extension, and a recess may be formed in a region toward the inner side of the bearing.

  In the above embodiment, the surface extending in the direction perpendicular to the rotation axis of the cage may extend in an oblique direction or may be a curved surface. That is, for example, the concave portion may have a shape recessed in an arc shape.

  In the above-described embodiment, the column portion is configured to include a connecting portion extending in the direction of the rotation axis of the cage at the center portion in the direction of the rotation axis of the cage. The structure which does not have the connection part extended in the direction of the axis of rotation of the vessel, that is, the bearing inner ends of the pair of inclined parts are connected as they are, and is substantially V-shaped in the central region of the column part. It may be a thing.

  Further, in the above embodiment, the roller PCD is in contact with the needle roller accommodated in the pocket and the side wall surface of the pocket, specifically, the roller guide portion provided in the inclined portion. The present invention is not limited to this, and the present invention is also applied to the case where the needle roller and the guide portion come into contact with each other at a position deviated from the roller PCD.

  In the above embodiment, the cage is a so-called M-type cage in which each of the pair of annular portions has a collar portion. However, the present invention is not limited to this, and is a so-called V-type cage having no collar portion. There may be.

  In the above embodiment, needle rollers are used as the rollers accommodated in the pockets. However, the present invention is not limited to this, and cylindrical rollers or rod rollers may be used.

  In the above-described embodiment, the bearing is composed of a roller with a cage, that is, the bearing includes a plurality of needle rollers and a cage that accommodates the plurality of needle rollers. It is good also as a structure provided not only with an outer ring | wheel and an inner ring | wheel.

  Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The roller bearing retainer according to the present invention is effectively used when a long life is required.

  11, 51, 71 Cage, 12a, 12b, 52a, 52b Annular part, 13 Needle roller, 14a, 14b, 14c, 14d pocket, 15a, 15b, 15c, 53, 72 Column part, 16 axis of rotation, 17 rollers PCD, 21a, 21b collar, 22a, 22b circular part, 23a, 23b, 24a, 24b chamfer, 26a, 26b, 26c, 26d, 54a, 54b, 73 inclined part, 27a, 27b, 27c, 27d, 55a, 55b, 74 extension part, 28a, 28b, 56a connecting part, 29a, 29b inner diameter side roller stopper, 30a, 30b outer diameter side roller stopper, 31a, 32a, 32b, 32c, 32d, 33a, 33b, 33c, 33d, 34a, 34b Side wall surface, 35a, 35b, 57a, 57b, 75 Roller guide part, 36a, 36b, 36c 36d, 65a, 65b, 65c, 65d point, 37a, 37b corner, 38a, 41a, 41b, 42a, 42b, 46a, 46b, 58a, 58b, 59a, 59b, 62a, 62c, 64a, 76, 77, 80 Outer diameter surface, 38b, 47a, 47b, 48a, 49a, 62b, 62d, 63a, 64b Inner diameter surface, 43a, 43b, 60a, 60b, 78 Recess, 44a, 44b surface, 45a, 45 locations, 61a, 61b region, 66a, 66b, 66c, 66d lines, 79 convex portions.

Claims (9)

A roller bearing retainer comprising a pair of annular portions and a plurality of column portions connecting the pair of annular portions so as to form a pocket for accommodating the rollers,
In a cross section cut along a plane parallel to the rotation axis of the cage and including the rotation axis, the column portion includes a pair of inclined portions extending obliquely with respect to the rotation axis direction of the cage, and the holding A pair of extending portions extending inward from the pair of annular portions along the rotation axis of the vessel, respectively, and being connected to the pair of inclined portions at the inner end portions,
The pair of inclined portions extends toward the inner diameter side than the pair of extending portions,
Side wall surfaces of the pockets in the pair of inclined portions are regions extending along the rotation axis direction of the cage, and have roller guide portions that guide the rollers,
A roller bearing retainer, wherein an outer diameter surface of the inclined portion is provided with a concave portion recessed toward an inner diameter side with respect to the outer diameter surface of the extension portion. 2. The roller bearing according to claim 1, wherein the concave portion is provided so that a region located on the outermost diameter side of the inclined portion is recessed closer to an inner diameter side than an outer diameter surface of the extension portion. Cage. The cross section cut along a plane that is parallel to the rotation axis of the cage and includes the rotation axis, the recess is constituted by a line parallel to the rotation axis of the cage. Roller bearing cage. In a cross section taken along a plane parallel to the rotation axis of the cage and including the rotation axis, a surface extending in a direction perpendicular to the rotation axis of the cage is between the extension portion and the recess. The roller bearing retainer according to any one of claims 1 to 3, which is provided. The roller bearing retainer according to any one of claims 1 to 4, wherein a corner portion of an end portion of the roller guide portion in a rotation axis direction is chamfered. The roller bearing retainer according to claim 5, wherein the chamfering is R chamfering. In the cross section cut by a plane parallel to the rotation axis of the cage and including the rotation axis, the pillar portion connects the inner ends of the pair of inclined portions to each other. The roller bearing retainer according to any one of claims 1 to 6, further comprising a connecting portion extending along the rotation axis. In a cross section cut by a plane parallel to the rotation axis of the cage and including the rotation axis, the thickness of the region including the roller guide portion in the inclined portion is the extension portion and the connection portion. The roller bearing retainer according to claim 7, wherein the roller bearing retainer is thicker than at least one of the wall thicknesses. In a cross section cut by a plane parallel to the rotation axis of the cage and including the rotation axis, the thickness of the region including the roller guide portion in the inclined portion is that of both the extension portion and the connection portion. The roller bearing retainer according to claim 7 or 8, which is thicker than a wall thickness.

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