JP5773822B2 - Roller bearing cage - Google Patents

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 under such a harsh environment, smooth rolling of the roller is required. Here, even when the bearings disclosed in Patent Documents 1 to 4 described above are used, an increase in torque occurs between the pocket side wall surface and the pocket when contacting the pocket side wall surface. There is. If it does so, there exists a possibility that smooth rolling of a roller cannot be aimed at.

  An object of the present invention is to provide a roller bearing cage capable of smoothly rolling a roller.

  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 by 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 inclined with respect to the rotation axis direction of the cage. 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, in the roller guide portion, the central region in the rotation axis direction of the cage is formed on the side wall surface so as to form concave portions in which the side wall surface is recessed in the circumferential direction in both end region in the rotation axis direction of the cage. Convex portions formed so as to protrude partly in the circumferential direction are provided.

  By comprising in this way, the convex part formed in the center area | region of a roller guide part contacts the side wall surface part of a pocket. If it does so, the contact area with the side wall surface part of a pocket at the time of contacting with the side wall surface part of a pocket can be made small. Therefore, torque can be reduced and the rollers can be smoothly rolled. 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 concave portion and the convex portion may have a shape extending along the inclination direction of the inclined portion. By comprising in this way, even if it is a case where a roller moves a little to radial direction, a convex part can be made to contact appropriately.

  Moreover, the corner | angular part located in the recessed part among convex parts may be chamfered. By carrying out like this, the abrasion of the roller at the time of contact with the side wall surface part of a pocket can be made small. In addition, the oil permeability of the lubricating oil is improved. Therefore, the side wall surface of the pocket can be brought into contact more appropriately. Further, the chamfering may be R chamfering. By doing so, the side wall surface of the pocket can be brought into contact with a smooth surface, more reliably reducing the wear of the roller when contacting the side wall surface of the pocket and improving the oil permeability of the lubricating oil. Can be achieved.

  Moreover, the structure which a recessed part and a convex part continue in a curved surface may be sufficient. According to such a configuration, it is possible to more reliably reduce the wear of the roller when the side wall surface portion of the pocket comes into contact and improve the oil permeability of the lubricating oil.

  Further, when the cage is viewed from the radial direction, both end regions in the rotation axis direction of the cage are recessed closer to the column side than the central region in the rotation axis direction of the cage among the side wall surfaces in the inclined portion. It may be a shape. With such a configuration, for example, when a pocket is formed by punching a member from the radial direction by pressing at the time of manufacturing, the above-described concave portion and convex portion can be formed in this punching step. Therefore, the cage having the above-described shape can be easily manufactured, and the productivity is improved.

  As a preferred embodiment, in a cross section cut along a plane that is parallel to the rotation axis of the cage and includes the rotation axis, the column portions are respectively inward from the pair of annular portions along the rotation axis of the cage. Along the rotation axis of the cage, the pair of extending portions connected to the pair of inclined portions at the inner end portions and the inner end portions of the pair of inclined portions are connected to each other. And a connecting portion extending. 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 inclined portion in the portion where the roller guide portion is located is at least one of the extension portion and the connection portion. You may comprise thicker than one wall thickness. Thus, by increasing the thickness of the inclined portion, the skew angle of the rollers accommodated in the pocket 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 extended.

  In addition, in the cross section cut along a plane parallel to the rotation axis of the cage and including the rotation axis, the thickness of the inclined portion may be greater than the thickness of both the extending portion and the connecting portion. Even with such a configuration, the life of the bearing can be extended.

  By comprising in this way, the convex part formed in the center area | region of a roller guide part contacts the side wall surface part of a pocket. If it does so, the contact area with the side wall surface part of a pocket at the time of contacting with the side wall surface part of a pocket can be made small. Therefore, torque can be reduced and the rollers can be smoothly rolled.

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 pocket. 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 arbitrary pocket 14d 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 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. . 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 rollers 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, with respect to the side wall surface 32a of one inclined portion 26a, the central region 38a is closer to the pocket 14b in the circumferential direction than the end region 38b in the direction of the rotation axis 16 of the cage 11. It has a protruding shape. That is, when the cage 11 is viewed from the radial direction, the central region 38a in the direction of the rotation axis 16 of the cage 11 is the both ends of the side wall surface 32a of the inclined portion 26a in the direction of the rotation axis 16 of the cage 11. It is a shape that protrudes closer to the pocket 14b than the partial region 38b. In this case, the center of the rotation axis 16 of the cage 11 on the side wall surface 32a protrudes most so as to protrude in the arc shape toward the pocket 14b. 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 central region 38c in the direction of the rotation axis 16 of the cage 11 is the both ends of the side wall surface 32b of the inclined portion 26b in the direction of the rotation axis 16 of the cage 11. The shape protrudes more toward the pocket 14b than the partial region 38d.

  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. From the viewpoint of easy understanding, the degree of protrusion of the convex portion shown in FIG. 7 is exaggerated and greatly illustrated.

  1 to 7, in the roller guide portion 35 a, the central region in the direction of the rotation axis 16 of the cage 11 has a side wall surface 32 a that surrounds both end regions in the direction of the rotation axis 16 of the cage 11. It is the structure provided with the convex part 36a formed so that a part of side wall surface 32a may protrude in the circumferential direction so that a pair of recessed part 37a, 37b dented in the direction may be formed.

The configuration of the convex portion 36a and the pair of concave portions 37a and 37b will be specifically described. The roller guide portion 35a extends from the inner wall surface 44a of the inclined portion 26a of the column portion 15a to the outer wall surface 44b of the inclined portion 26a of the column portion 15a. In addition, the roller guide part 35a is an area | region shown between the point 45a and the point 45b in FIG. The length in the direction of the rotation axis 16 of the retainer 11 of the roller guide portion 35a is one represented by the direction of the length L ₁ of the rotational axis 16 of the retainer 11 between the wall surface 44a and wall surface 44b. And the bus-line shape in the roller guide part 35a becomes a shape shown in FIG.

The convex part 36a is formed so that the center area | region of the direction of the rotating shaft 16 of the holder | retainer 11 may protrude in the circumferential direction among the inclination parts 26a. This for the central region, in FIG. 7, a left-right direction of a region indicated by the length L ₂ between the points 43b from point 43a. Then, a further central region in the central region, specifically, the left-right direction of a region indicated by the length L ₃ between the points 42b from point 42a in FIG. 7 is a shape that projects further in the circumferential direction. A point 41 located exactly in the middle between the wall surface 44a and the wall surface 44b is the most protruding portion.

  And the part from the point 43a to the wall surface 44a shows one recessed part 37a of a pair of recessed parts 37a and 37b. That is, in the region where the recess 37a is provided, a part of the side wall surface 32a is recessed in the circumferential direction. Regarding the concave portion 37a, the leftmost point 45a located on the wall surface 44a in the left-right direction in FIG. 7 is the most concave portion in the circumferential direction. Similarly, the part from the point 43b to the wall surface 44b shows the other recessed part 37b of a pair of recessed parts 37a and 37b. That is, in the region where the recess 37b is provided, a part of the side wall surface 32a is recessed in the circumferential direction. Regarding the concave portion 37b, the rightmost point 45b located on the wall surface 44b in the left-right direction in FIG. 7 is the most concave portion in the circumferential direction.

  Of the convex portion 36a, the corner portion 47a on the concave portion 37a side and the corner portion 48a on the wall surface 44a side are chamfered. Specifically, these chamfers are R chamfers. Similarly, chamfering is also performed on the corner portion 47b on the concave portion 37b side and the corner portion 48b on the wall surface 44b side of the convex portion 36a. Specifically, these chamfers are also R chamfers.

  About the area | region which reaches the convex part 36a and a pair of recessed part 37a, 37b side, it is comprised by the smooth curved surface. That is, in the roller guide portion 35a constituted by the convex portion 36a and the pair of concave portions 37a and 37b, as shown in FIG. 7, the roller guide portion 35a has a smooth curved surface from the inner wall surface 44a to the outer wall surface 44b. It is configured. Then, both end regions in the direction of the rotation axis 16 of the cage 11 that is a part of the side wall surface 32a are recessed toward the columnar portion 15a in the circumferential direction to form a pair of recesses 37a and 37b, and a pair of recesses 37a and 37b. The convex region 36a is formed by relatively projecting the central region in the direction of the rotation axis 16 of the cage 11 that is the region between the two in the direction of the circumferential pocket 14b.

Degrees of depressions 37a and 37b, that is, points 45a and 45b that are the most recessed portions in the circumferential direction among the depressions 37a and 37b, and points 41 that are the most protruding portions in the circumferential direction among the projections 36a length between the, in particular, as the length between the lines and points 41 connecting the 45a and the point 45b point indicated by the length _{L 4} in FIG. 7, for example, 0.01 mm (millimeters) of Adopted. A dotted line 49 that passes through the point 41 and extends in the direction of the rotation axis 16 of the cage 11 is a generatrix of the rolling surface of the needle roller 13 when the point 41 and the needle roller 13 are in contact with each other. .

The convex portion 36a and the pair of concave portions 37a and 37b have a shape extending along the inclination direction of the inclined portion 26a. Specifically, the inclination direction is the direction of the direction or vice versa indicated by the arrow D ₁ of the in Figure 6, with respect to the rotational axis 16 of the retainer 11, is inclined by an angle theta. The regions 39a and 40a where the convex portions 36a are formed are indicated by hatched regions in FIG. The region 39a is a region surrounded by a three-dot chain line, and the region 40a is a region surrounded by a four-dot chain line. The portion indicated by the region 40a is recessed closer to the column portion 15a side in the circumferential direction than the portion indicated by the region 39a.

  The other inclined portion 26b also has a configuration in which a convex portion and a pair of concave portions are provided in the roller guide portion 35b. However, since the configuration is the same as that of the one inclined portion 26a, the description thereof is omitted. In FIG. 6, a convex portion 36b corresponding to the convex portion 36a, a pair of concave portions 37c and 37d corresponding to the pair of concave portions 37a and 37b, a region 39b corresponding to the region 39a, and a region 40b corresponding to the region 40a are shown. Show.

  According to such a configuration of the cage 11, the side wall surface 31 a of the pocket 14 b and the needle roller 13 come into contact with each other at the convex portions 36 a and 36 b formed in the central region of the roller guide portions 35 a and 35 b. . If it does so, the contact area of the side wall surface 31a of the pocket 14b and the needle roller 13 at the time of the side wall surface 31a of the pocket 14b and the needle roller 13 contacting can be made small. That is, the entire roller guide portions 35a and 35b can be brought into contact with the needle rollers 13 at the convex portions 36a and 36b provided in the central region, instead of being in contact with the needle rollers 13. Therefore, torque can be reduced and the needle rollers 13 can be smoothly rolled. In this case, the guide rollers 35a and 35b are in contact with the needle roller 13 in a region having a certain width including the point 41, rather than the point 41 alone.

  In this case, since the convex portions 36a, 36b and the pair of concave portions 37a, 37b, 37c, 37d extend in the inclined direction of the inclined portions 27a, 27b, the needle rollers 13 slightly move in the radial direction. Even if it is a case, convex part 36a, 36b and the needle roller 13 can be made to contact appropriately.

  In addition, since the corners located in the concave portions 37a, 37b, 37c, and 37d of the convex portions 36a and 36b are chamfered, the side wall surface 31a of the pocket 14b and the needle roller 13 come into contact with each other. The wear of the needle rollers 13 can be reduced. In addition, the oil permeability of the lubricating oil is improved. Therefore, the side wall surface 31a of the pocket 14b and the needle roller 13 can be brought into contact more appropriately. Further, since the chamfering is an R chamfer, the side wall surface 31a of the pocket 14b and the needle roller 13 can be brought into contact with each other with a smooth surface, and the side wall surface 31a of the pocket 14b and the needle roller 13 can be more reliably contacted. It is possible to reduce the wear of the needle rollers 13 when they come into contact with each other and improve the oil permeability of the lubricating oil.

  In this case, since the convex portions 36a and 36b and the concave portions 37a, 37b, 37c, and 37d are configured to be continuous with curved surfaces, the side wall surface 31a of the pocket 14b and the needle rollers 13 are more reliably in contact with each other. It is possible to reduce the wear of the needle rollers 13 and improve the oil permeability of the lubricating oil.

  Here, when the cage 11 is viewed from the radial direction, both end regions 38b and 38d in the direction of the rotation axis 16 of the cage 11 out of the side wall surfaces 32a and 32b in the inclined portions 26a and 26b are the cage 11. For example, when forming the pocket 14b by punching a member from the radial direction by pressing at the time of manufacture, because the shape is recessed toward the column portion 15a side than the central regions 38a, 38c in the direction of the rotation axis 16 of In this punching step, the concave portions in the both end regions 38b and 38d and the convex portions in the central regions 38a and 38c can be formed. Therefore, the cage 11 having the above-described shape can be easily manufactured, and the productivity is improved.

  Here, you may comprise the plate | board thickness of a pair of inclination part thicker than the thickness of both a connection part and an extension part among the pillar parts in a holder | retainer. 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 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. Of the roller guide portions 57a and 57b, the central region in the rotational axis direction of the cage 51 forms a pair of concave portions 59a and 59b whose side wall surfaces are recessed in the circumferential direction in both end regions in the rotational axis direction of the cage 51. As described above, a convex portion 58a formed so as to project a part of the side wall surface in the circumferential direction is provided.

Here, the thickness of the pair of inclined portions 54a and 54b is thicker than the thickness of both the pair of extending portions 55a and 55b and the connecting portion 56a. Specifically, the shortest length _{L 5} from the outer diameter surface 60a to the inner diameter surface 60b of the inclined portion 54a is and out of the circumferential surface 60a of the shortest to the inner surface 60b length _{L 6} of the extending portion 55a, It is configured longer than the minimum length L ₇ to the inner diameter surface 60b from the outer diameter surface 60a of the connecting portion 56a. 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 pair of inclined portions 54a and 54b, and other basic configurations of the cage 51 are shown in FIG. The same as the cage 11.

  Thus, by increasing the thickness of the inclined portions 54a and 54b, 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, specifically, the rigidity of roller guide part 57a, 57b can be made high. Therefore, the life of the bearing can be extended.

  In the embodiment shown in FIG. 8, the thickness of the pair of inclined portions is configured to be thicker than the thickness of both the pair of extending portions and the connecting portion. You may comprise thicker than the thickness of at least any one of a connection part.

In the above embodiment, the dimensions such as the length L ₁ to the length L ₇ are arbitrarily determined according to the characteristics required for the cage, the manufacturing process, and the like. Moreover, although it was set as the structure extended in the inclination direction about a convex part and a pair of recessed part, it is good also as a structure provided only in the part corresponded not only to this but a roller guide part. Furthermore, in the above-described configuration, the convex portion and the concave portion have a bilaterally symmetrical configuration, but the concave portion and the convex portion may be formed so as to be biased in the left-right direction. Furthermore, the structure which forms a convex part and a pair of recessed part only in one side among a pair of inclination parts may be sufficient.

  Further, in the above embodiment, the convex portion and the pair of concave portions are chamfered at the corner portions, and are configured to be connected with a smooth curved surface. However, the configuration is not limited to this, and the configuration shown in FIG. There may be.

  FIG. 9 is an enlarged cross-sectional view showing an enlarged part of a column portion in a cage of a needle roller bearing according to still another embodiment of the present invention, and corresponds to the cross section shown in FIG. Referring to FIG. 9, in a cage 61 according to still another embodiment of the present invention, in the roller guide portion 62, the central region in the rotation axis direction of the cage 61 has both ends in the rotation axis direction of the cage 61. In the partial region, a convex part 63a is formed so that a part of the side wall surface protrudes in the circumferential direction so as to form a pair of recesses 64a and 64b whose side wall surface is recessed in the circumferential direction. Of the convex portion 63a, the corner portions 65a and 65b located on the concave portion 64a and 64b side are not chamfered and remain square. Further, the corner portion 65c on the wall surface 66a side of the recess portion 64a and the corner portion 65d on the wall surface 66b side of the recess portion 64b are not chamfered and remain square. You may be comprised in this way.

  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-described embodiment, in the pillar portion, the central portion in the direction of the rotation axis of the cage was shaped to be located on the inner diameter side than both end portions in the direction of the rotation axis. The center part in the direction of the rotation axis may be in a shape located on the outer diameter side than both ends in the direction of the rotation axis.

  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 and an inner ring.

  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 smooth rolling of the roller is required.

  11, 51, 61 Cage, 12a, 12b, 52a, 52b Annular part, 13 Needle roller, 14a, 14b, 14c, 14d Pocket, 15a, 15b, 15c, 53 Column part, 16 Rotating axis, 17 Roller PCD, 21a, 21b collar part, 22a, 22b annular part, 23a, 23b, 24a, 24b chamfer, 26a, 26b, 26c, 26d, 54a, 54b inclined part, 27a, 27b, 27c, 27d, 55a, 55b 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, 62 Roller guide part, 36a, 36b, 58a, 63a Convex part, 3 a, 37b, 37c, 37d, 59a, 59b, 64a, 64b recess, 38a, 38c central region, 38b, 38d, end region, 39a, 39b, 40a, 40b region, 41, 42a, 42b, 43a, 43b, 45a, 45b point, 44a, 44b, 66a, 66b wall surface, 47a, 47b, 48a, 48b, 65a, 65b, 65c, 65d corner, 49 dotted line, 60a outer diameter surface, 60b inner diameter surface.

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 in 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 inclined with respect to the rotation axis direction of the cage,
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,
Among the roller guide portions, the central region in the rotation axis direction of the cage is formed on the side so that the side wall surfaces form recesses recessed in the circumferential direction in both end regions in the rotation axis direction of the cage. A roller bearing retainer comprising a convex portion formed so that a part of a wall surface projects in the circumferential direction. The roller bearing retainer according to claim 1, wherein the concave portion and the convex portion have a shape extending along an inclination direction of the inclined portion. Among the convex portions, corner portions located on the concave portion side are chamfered. A cage for a roller bearing according to claim 1 or 2. The roller bearing retainer according to claim 3, wherein the chamfering is R chamfering. The cage of the roller bearing according to any one of claims 1 to 4, wherein the concave portion and the convex portion are configured to be continuous on a curved surface. When the cage is viewed from the radial direction, among the side wall surfaces of the inclined portion, both end regions in the rotation axis direction of the cage are more than the central region in the rotation axis direction of the cage. The cage for a roller bearing according to any one of claims 1 to 5, which has a concave shape on the side. In a cross section cut by a plane parallel to the rotation axis of the cage and including the rotation axis, the column portions extend inward from the pair of annular portions along the rotation axis of the cage, respectively. Along the rotation axis of the retainer so as to connect the pair of extending portions connected to the pair of inclined portions at the inner end portions and the inner end portions of the pair of inclined portions, respectively. The roller bearing retainer according to any one of claims 1 to 6, comprising a connecting portion extending. 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 inclined portion in the portion where the roller guide portion is located is the extension portion and the connection portion. The roller bearing retainer according to claim 7, wherein the cage is thicker than at least one of the thicknesses. The thickness of the inclined portion is thicker than the thickness of both the extending portion and the connecting portion in a cross section cut by a plane parallel to the rotational axis of the cage and including the rotational axis. A cage for roller bearings according to 7 or 8.

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