JP2008082421A - Solid-shaped needle-like roller bearing and method of manufacturing cage of solid-shaped needle-like roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure high durability, by preventing the occurrence of fretting abrasion in a contact part of a needle-like roller and a track surface. <P>SOLUTION: This cage 30 of a solid-shaped needle-like roller bearing 1 is divided into two parts in the circumferential direction with a predetermined dividing margin H by a dividing part 33, and can be respectively displaced by the dividing margin H, without being restricted by a non-load zone, when rotating the bearing 1. The cage 30 changes the contact part of the needle-like roller 20 held by a pocket part 32 and the track surface 11 by displacement in a range of the dividing margin H when rotating the bearing 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a solid needle roller bearing and a solid needle roller bearing in which a plurality of needle rollers guided to a raceway surface and a collar portion of an outer ring are respectively held in a pocket portion of a cage so as to roll freely. More particularly, the present invention relates to a cage structure for preventing fretting wear.

Conventionally, solid needle roller bearings are known (see, for example, Patent Document 1).
FIG. 9 is a cross-sectional view showing a solid needle roller bearing disclosed in Patent Document 1. As shown in FIG.

  As shown in FIG. 9, the solid needle roller bearing 100 includes an outer ring 110 having a raceway surface 111 on the inner periphery and protruding flanges 112 at both end portions in the axial direction of the raceway surface 111, and an outer ring 110. A plurality of needle rollers 120 guided by the raceway surface 111 and the collar portion 112, and a retainer 130 that holds the needle rollers 120 in the pocket portions 131 so as to be freely rollable.

  The retainer 130 has an annular body 132 on both sides, a bent portion 133 that is bent in the inner diameter direction is formed between the annular bodies 132, and a pocket that extends from the bent portion 133 to the annular body 132. 131 are formed at equal intervals in the circumferential direction.

Further, a grinding clearance groove 113 is formed at the base end portion of the flange portion 112 on the raceway surface 111 of the outer ring 110, and in the region 114 indicated by a chain line in FIG. It is formed. Due to the compressive residual stress in the region 114, an induced thrust force generated by the skew of the needle rollers 120 is loaded on the flange portion 112, so that the tensile force generated on the inner surface portion of the grinding clearance groove 113 is relieved. . Thereby, the fatigue strength in the thin part of the grinding relief groove 113 is improved.
Japanese Patent Laid-Open No. 2000-161367 (page 3, FIG. 1)

  FIG. 10 is a sectional view showing a conventional solid needle roller bearing, and FIG. 11 is a side view of FIG.

  Referring to FIGS. 10 and 11, the solid needle roller bearing 140 is formed on the inner periphery of the outer ring 170 by holding a plurality of needle rollers 150 in the pockets 162 of the cage 160, respectively. The needle rollers 150 are guided by the raceway surface 171 and the flanges 172 protruding from both end portions in the axial direction of the raceway surface 171. The retainer 160 is formed by forming a plurality of pockets 162 at equal intervals in the circumferential direction on a retainer body 161 integrally formed in an annular shape.

  In any of the conventional solid needle roller bearings 100 and 140 described above, the outer rings 110 and 170 and shafts (not shown) formed with the raceway surfaces 111 and 171 of the needle rollers 120 and 150 rotate in the same direction. In this case, the needle rollers 120 and 150 do not rotate and do not move in the circumferential direction with respect to the raceway surfaces 111 and 171 but are subjected to a load at the same location along the circumferential direction of the raceway surfaces 111 and 171.

  Accordingly, minute vibrations and swinging motions occur at the contact portions between the needle rollers 120 and 150 and the raceway surfaces 111 and 171, and wear similar to indentations called fretting (false brinelling) (hereinafter referred to as fretting wear). ). In particular, in the case of the solid needle roller bearings 100 and 140, the flanges 112 are protruded on both sides in the axial direction of the raceway surfaces 111 and 171 of the outer rings 110 and 170 so that the lubricating oil is supplied into the bearings. Inhibited by the buttocks 112. For this reason, it is difficult for lubricating oil to be supplied into the bearing, and wear tends to occur.

  An object of the present invention is to provide a solid needle roller bearing capable of preventing the occurrence of fretting wear at a contact portion between a needle roller and a raceway surface, thereby ensuring high durability. Yes.

  The above object of the present invention is achieved by the following configurations.

(1) an outer ring having a raceway surface and a flange on the inner periphery;
A plurality of needle rollers guided by the raceway surface and the flange of the outer ring;
In a solid needle roller bearing comprising a cage that holds the needle rollers in a pocketable manner, respectively,
A solid needle roller bearing according to claim 1, wherein the cage is divided into two in the circumferential direction by a predetermined dividing margin at a dividing portion.

  (2) The solid needle roller bearing according to (1), wherein, in the split portion of the cage, the split margin along the circumferential direction is equal to or less than the height of the flange portion of the outer ring.

  (3) The solid needle roller bearing according to (1), wherein, in the split portion of the cage, the split margin along the circumferential direction is half or less of the needle roller diameter.

(4) an outer ring having a raceway surface and a flange on the inner periphery;
A plurality of needle rollers guided by the raceway surface and the flange of the outer ring;
In a solid needle roller bearing comprising a cage that holds the needle rollers in a pocketable manner, respectively,
The retainer is formed in an annular integrally formed retainer body by forming a plurality of pocket portions of the same shape at equal intervals in the circumferential direction, and then subjected to heat treatment, and further in a circumferential direction at a predetermined divided portion. A method of manufacturing a retainer for a solid needle roller bearing, wherein the cage is formed by being divided into two parts with a predetermined dividing margin.

  Examples of the material of the cage include carbon steel and chromium molybdenum steel as metals, and polyamide resins such as polyamide 46 and polyamide 66, 46 nylon and 66 nylon as synthetic resins. In addition, when these synthetic resins are appropriately mixed with 10 to 50% by mass of fibrous filler (glass fiber or carbon fiber), the rigidity and dimensional accuracy can be improved.

  In the solid needle roller bearing described in the above (1), the cage is divided into two parts in the circumferential direction by a predetermined division allowance at the division part, so that it is restrained in a non-load zone when the bearing rotates. Each can be displaced by the amount of division.

  The cage changes the contact portion between the needle roller held in the pocket portion and the raceway surface due to the displacement within the range of the division allowance accompanying the rotation of the bearing. Thereby, generation | occurrence | production of the fretting wear in the contact part of a needle roller and a track surface is prevented.

  In the solid needle roller bearing described in the above (2), since the division allowance of the cage is equal to or less than the height of the flange portion of the outer ring, the cage is inserted in a state where the cage and the needle roller are incorporated in the outer ring. For example, even when the shaft roller is displaced in the axial direction by the amount of division due to vibration during bearing conveyance, the needle roller does not come off from the flange portion of the outer ring.

  This prevents the needle rollers from falling off the bearing due to vibration or the like during bearing conveyance. In addition, it is not necessary to pay attention so that the needle rollers do not fall off when the bearing is incorporated into the shaft or the like, and good bearing assemblability is ensured.

  In the solid needle roller bearing according to the above (3), since the division allowance of the cage is not more than half of the needle roller diameter, preferably 0.3 to 0.4 times, the cage and needle roller are provided on the outer ring. Even when the cage is displaced in the axial center direction by the amount of the division due to vibration during bearing conveyance, for example, the needle roller does not come off the flange of the outer ring.

  This prevents the needle rollers from falling off the bearing due to vibration or the like during bearing conveyance. In addition, it is not necessary to pay attention so that the needle rollers do not fall off when the bearing is incorporated into the shaft or the like, and good bearing assemblability is ensured.

  In the method for manufacturing a cage for a solid needle roller bearing according to the above (4), the cage has the same shape as the other parts in the state before the division in the state before the division. Since the pocket portion is formed and then heat-treated, variation in rigidity along the circumferential direction due to nonuniformity of the pocket portion shape of the cage body is prevented.

  Thereby, deformation at the time of heat treatment due to variation in rigidity along the circumferential direction of the cage body is prevented, post-processing for correcting deformation and increase in the depth of the hardened layer are unnecessary, and cost reduction is achieved.

  According to the solid needle roller bearing of the present invention, it is possible to prevent the occurrence of fretting wear at the contact portion between the needle roller and the raceway surface, thereby ensuring high durability.

  The solid needle roller bearing obtained by the present invention is used for automobiles, industrial machines and the like, and is particularly preferably used for supporting a rotating part of an automobile transmission when high durability is required.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a sectional view showing a solid needle roller bearing according to an embodiment of the present invention, and FIG. 2 is a side view of FIG. 3 is a cross-sectional view showing a process in which the cage of the solid needle roller bearing of FIG. 1 is displaced in the axial center direction, where (a) shows a state before displacement, and (b) shows a state after displacement. Each state is shown. 4 is a cross-sectional view showing a state in which the cage of the solid needle roller bearing of FIG. 1 is displaced in the axial center direction, and FIG. 5 is a side view of FIG.

  Further, FIG. 6 is a perspective view showing a dividing process of the cage of the solid needle roller bearing of FIG. 1, wherein (a) shows a state before dividing and (b) shows a state after dividing. 7 is a side view showing an image after the heat treatment of the cage after the division of FIG. 6, and FIGS. 8A to 8D are views of the cage during operation of the solid needle roller bearing of FIG. It is a schematic side view which shows a motion.

  1 to 5, the solid needle roller bearing 1 includes an outer ring 10 having a raceway surface 11 and a flange portion 12 on an inner periphery, and a plurality of guides guided by the raceway surface 11 and the flange portion 12 of the outer ring 10. The needle roller 20 includes a needle roller 20 and a cage 30 that holds the needle roller 20 in the pocket portion 32 so as to be freely rollable.

  The flange portion 12 of the outer ring 10 is provided on both sides of the raceway surface 11 in the axial direction so as to protrude toward the inner circumference with a predetermined height h.

  The cage 30 has a plurality of pocket portions 32 of the same shape formed at equal intervals in the circumferential direction between the pillar portions 31a of the cage body 31 integrally formed in an annular shape. Divided in the circumferential direction by a margin H. The cage 30 is not constrained in the non-load zone during one rotation of the bearing, and can be displaced by the division allowance H. The cage 30 changes the contact portion between the needle roller 20 held in the pocket portion 32 and the raceway surface 11 by displacement within the range of the division allowance H accompanying one rotation of the bearing.

  The dividing margin H along the circumferential direction in the dividing portion 33 of the cage 30 is not more than the height h (H ≦ h) of the flange portion 12 of the outer ring 10 and not more than half of the diameter of the needle roller, preferably needle-like. It is 0.3 to 0.4 times the roller diameter.

  The cage 30 and the needle rollers 20 are incorporated in the outer ring 10 because the split allowance H of the cage 30 is not more than the height h of the flange 12 of the outer ring 10 and not more than half of the diameter of the needle rollers. In the assembled state, for example, when the cage 30 is displaced in the axial center direction (in the direction of arrow A in FIG. 3A) by an amount corresponding to the division allowance H due to vibration during bearing conveyance (FIG. 3A → FIG. 3). However, the needle roller 20 does not come off from the flange 12 of the outer ring 10 in the direction of arrow B in FIG.

  Referring to FIGS. 6 and 7, the retainer 30 is formed with a plurality of pocket portions 32 having the same shape in the retainer body 31 at equal intervals in the circumferential direction (see FIG. 6A), and then heat treatment is performed. (See FIG. 7), and further divided into two by a predetermined dividing portion 33 with a predetermined dividing margin H in the circumferential direction (see FIG. 6B).

  That is, as shown in FIG. 6A, the retainer 30 has a pocket portion 32 having the same shape as that of the other portions in the portion to be the divided portion 33 in the retainer main body 31 in the state before the division. In this state, heat treatment is performed. Therefore, the variation in the rigidity along the circumferential direction due to the non-uniformity of the shape of the pocket portion 32 of the cage body 31 is prevented (see FIG. 7).

The operation of this embodiment will be described.
Referring to FIG. 8 (a), during operation of the solid needle roller bearing 1, the outer ring 10 and the shaft 2 rotate in the clockwise direction in FIG. 8 (a), and the load point is in FIG. 8 (a). When a load is applied from the top, that is, from the direction of arrow C in FIG. 8A, the load zone is 180 ° or less, and the side opposite to the load point is a non-load zone.

  As shown in FIG. 8B, in the non-load zone, the retainer 30 is not constrained and can be displaced by the division allowance H. Accordingly, when the cage 30 enters the non-load zone, the cage 30 is displaced by the division allowance H in the direction opposite to the rotation direction of the outer ring 10 and the shaft 2 (FIG. 8B → FIG. 8C). Since the cage 30 enters the non-load zone twice per rotation of the bearing, the amount of displacement for the division allowance H of the cage 30 is 2 × H per rotation of the bearing (FIGS. 8A to 8D). )reference). The theoretical bearing rotation speed N is represented by (2 × H × n) / (π × dh).

  As described above, when the retainer 30 is displaced twice for each rotation of the bearing by the division allowance H, the contact portion between the needle roller 20 and the raceway surface 11 changes with the rotation of the bearing. Therefore, the occurrence of fretting wear at the contact portion between the needle roller 20 and the raceway surface 11 is prevented.

Next, a comparative test of the occurrence of fretting wear between the solid needle roller bearing incorporating the two-part cage of this embodiment and the solid needle roller bearing incorporating the conventional integrated cage. Went.
Table 1 is a table showing the results of the comparative test.

That is, the occurrence of fretting wear was confirmed by using the solid needle roller bearing shown below and rotating the outer ring and the shaft on which the raceway surface of the needle roller was formed in the same direction.
Bearing inner diameter: 30mm
Outer diameter: 42mm
Width: 17mm
PCD: 34mm
Test condition Shaft speed: 8000rpm
Outer ring rotation speed: 8000rpm
Relative rotation speed: 0rpm
Lubrication: ATF 0.1L / min
Test time: 200hr

  As can be seen from Table 1, in the solid needle roller bearing incorporating the conventional integrated cage, fretting wear occurs every time, but the two-fold cage of this embodiment is incorporated. In the solid needle roller bearings produced, fretting wear does not occur each time.

  As described above, according to the above-described embodiment, the cage 30 of the solid needle roller bearing 1 is divided into two in the circumferential direction by the dividing portion 33 with the predetermined dividing margin H, and the bearing 30 rotates once. At this time, it is not constrained in the non-load zone, and can be displaced by the division allowance H. Therefore, at the time of one rotation of the bearing, the contact portion between the needle roller 20 held in the pocket portion 32 of the cage 30 and the raceway surface 11 can be changed, and occurrence of fretting wear at the contact portion can be prevented. it can.

  In addition, since the division allowance H of the cage 30 is equal to or less than the height h of the flange portion 12 of the outer ring 10 and less than half of the diameter of the needle roller, the cage 30 and the needle roller 20 are incorporated in the outer ring 10. In the assembled state, for example, even when the cage 30 is displaced in the axial center direction by the amount of the division allowance H due to vibration or the like during the conveyance of the bearing 1, the needle roller 20 is detached from the flange portion 12 of the outer ring 10. Can be prevented.

  Thereby, it is possible to prevent the needle rollers 20 from falling off the bearing 1 due to vibrations or the like during the conveyance of the bearing 1. In addition, it is not necessary to pay attention so that the needle rollers 20 do not fall off when the bearings are incorporated into the shaft 2, and good assemblability of the solid needle roller bearing 1 can be ensured.

  The cage 30 is formed with a pocket portion 32 having the same shape as that of the other portions in the portion to be the divided portion 33 in the cage main body 31 in a state before the division, and heat treatment is performed in this state. Then, it is divided into two by the dividing unit 33. Therefore, variation in rigidity along the circumferential direction due to nonuniformity of the shape of the pocket portion 32 of the cage body 31 can be prevented.

  As a result, it is possible to prevent deformation during heat treatment due to variation in rigidity of the cage body 31 along the circumferential direction, and it is possible to eliminate the need for post-processing for correction of deformation and increase in the depth of the hardened layer. Cost reduction can be achieved.

  FIGS. 12A and 12B are perspective views showing a process of dividing the cage into two parts by a general dividing method, in which FIG. 12A shows a state before division and FIG. 12B shows a state after division. FIG. 13 is a side view showing an image after heat treatment of the cage after the division shown in FIG.

  Referring to FIGS. 12 and 13, when the cage 180 is divided into two parts by a general dividing method, as shown in FIG. 12A, the divided part 183 in which the pocket part 182 is not formed has high rigidity. Therefore, it tends to be elliptical during heat treatment as shown in FIG. In this case, post-processing for deformation correction and an increase in the depth of the hardened layer are required, resulting in an increase in cost.

  That is, when a general division method is used, as shown in FIG. 12A, the cage 180 is formed in a plurality of pocket portions 182 except for a predetermined division portion in a cage body 181 formed in an annular shape. Are formed at equal intervals in the circumferential direction, and the pocket portion 182 is not formed in the divided portion 183 of the cage main body 181. In this state, the cage 180 is subjected to heat treatment.

  At this time, the cage 180 has an elliptical shape as indicated by a symbol X in FIG. 13 due to the high rigidity of the divided portion 183 in which the pocket portion 182 is not formed. Thereafter, as shown in FIG. 12B, the cage 180 is divided into two in the circumferential direction by the dividing unit 183.

  On the other hand, in the present embodiment described above, as shown in FIG. 6A, the retainer 30 is also in a portion that becomes the split portion 33 in the retainer main body 31 in the state before the split, similarly to the other portions. A pocket portion 32 having the same shape is formed. After heat treatment is performed in this state, the pocket portion 32 is divided into two at the dividing portion 33. Therefore, the variation in the rigidity along the circumferential direction due to the non-uniformity of the shape of the pocket portion 32 of the cage body 31 is prevented (see FIG. 7).

  The present invention has been described above with reference to the embodiments. However, the present invention should not be construed as being limited to the above-described embodiments, and can be appropriately changed and improved. For example, the present invention can be applied to a shell roller bearing.

It is sectional drawing which shows the solid needle roller bearing which is one Embodiment of this invention. It is a side view of FIG. It is sectional drawing which shows the process in which the retainer of the solid needle roller bearing of FIG. 1 displaces to an axial center direction. It is sectional drawing which shows the state which the cage of the solid type needle roller bearing of FIG. 1 displaced to the axial center direction. FIG. 5 is a side view of FIG. 4. It is a perspective view which shows the division | segmentation process of the holder | retainer of the solid needle roller bearing of FIG. It is a side view which shows the image after the heat processing of the holder | retainer after division | segmentation of FIG. FIG. 2 is a schematic side view showing the movement of the cage during operation of the solid needle roller bearing of FIG. 1. It is principal part sectional drawing which shows the solid needle roller bearing currently disclosed by patent document 1. FIG. It is sectional drawing which shows the conventional solid type needle roller bearing. It is a side view of FIG. It is a perspective view which shows the division | segmentation process of a general holder | retainer. It is a side view which shows the image after the heat processing of the holder | retainer after the division | segmentation of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solid type needle roller bearing 2 Axis 10 Outer ring 11 Raceway surface 12 Ridge part 20 Needle roller 30 Cage 31 Cage body 32 Pocket part 33 Divided part h Height of collar H Dividence of cage

Claims (4)

An outer ring having a raceway surface and a flange on the inner periphery;
A plurality of needle rollers guided by the raceway surface and the flange of the outer ring;
In a solid needle roller bearing comprising a cage that holds the needle rollers in a pocketable manner, respectively,
A solid needle roller bearing according to claim 1, wherein the cage is divided into two in the circumferential direction by a predetermined dividing margin at a dividing portion.   2. The solid needle roller bearing according to claim 1, wherein, in the split portion of the cage, the split margin along the circumferential direction is equal to or less than the height of the flange portion of the outer ring.   2. The solid needle roller bearing according to claim 1, wherein in the divided portion of the cage, the dividing margin along the circumferential direction is not more than half of the diameter of the needle roller. An outer ring having a raceway surface and a flange on the inner periphery;
A plurality of needle rollers guided by the raceway surface and the flange of the outer ring;
In a solid needle roller bearing comprising a cage that holds the needle rollers in a pocketable manner, respectively,
The retainer is formed in an annular integrally formed retainer body by forming a plurality of pocket portions of the same shape at equal intervals in the circumferential direction, and then subjected to heat treatment, and further in a circumferential direction at a predetermined divided portion. A method of manufacturing a retainer for a solid needle roller bearing, wherein the cage is formed by being divided into two parts with a predetermined dividing margin.

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