JP4935536B2 - Double row roller bearing - Google Patents

Description

  The present invention relates to a double row roller bearing, for example, a double row shell needle roller bearing suitable for an AT clutch drum support bearing of a vehicle.

As this type of double row shell needle roller bearing, for example, as described in Patent Document 1 below, a double row needle roller housed in a pocket of a cage is provided with a flange portion provided on an outer ring, There is known a structure configured to be positioned on one side in the axial direction by abutting.
Japanese Patent Laid-Open No. 10-267031

  However, in the double-row shell needle roller bearing described in Patent Document 1, the needle rollers in each row are not configured to be positioned between the end surfaces facing each other in the axial direction. As shown in FIG. 6, the needle roller 1 is likely to cause a skew (a phenomenon in which the needle roller 1 is tilted with respect to the center line of the bearing) in the pocket 2a of the cage 2 (the broken line state in FIG. 6). In addition, when skew occurs in the needle roller 1, the rotation shaft is caused by the thrust force that pushes in the opposite direction in the axial direction between the outer ring and the inner ring or the rotation shaft. There is a risk of slipping out of the bearing during rotation, or causing heat generation or damage.

  The subject of this invention is providing the double row roller bearing which can suppress generation | occurrence | production of the skew of a roller.

Means for Solving the Problems and Effects of the Invention

In order to achieve the above object, the present invention is configured such that the double-row rollers housed in the cage pocket are positioned on one side in the axial direction by contact with the flange provided on the outer ring. In the double-row roller bearing, the flange portion of the outer ring is bent inward so as to have substantially the same inner diameter, and is integrally formed from the bent portion and the tip of the bent portion toward each outer end face of the double-row roller. A roller position restriction that positions the other side of each roller in the axial direction by contacting the end surface of each roller between the end surfaces facing each other in the axial direction. And an inner diameter position of the roller position restricting portion is set to be substantially the same as the height of the flange portion of the outer ring .

  In the double row roller bearing of the present invention, the double row rollers are positioned on one side in the axial direction by contact with the flange portion of the outer ring, and are positioned on the other side in the axial direction by contact with the roller position restricting portion. The For this reason, it becomes difficult for the rollers to fall with respect to the center line of the bearing, and the occurrence of skew can be suppressed.

  In carrying out the present invention, the roller position restricting portion may be a separate member from the outer ring, and may be formed of a ring-shaped member that can be elastically deformed at least in a direction in which the outer diameter is reduced. According to this, it is possible to easily incorporate the ring-shaped member into the outer ring by elastically bending the ring-shaped member in the direction in which the outer diameter is reduced. By using the ring-shaped member having such a simple configuration, the skew is reduced. Can be easily suppressed.

  In this case, the ring-shaped member may be formed with a slit inclined with respect to the radial direction from the outer peripheral portion to the inner peripheral portion. According to this, even when the roller moves in the circumferential direction while sliding on each end face of the ring-shaped member as the rotation shaft rotates, the roller is prevented from being caught by the ring shape. Smooth movement relative to the member can be ensured.

  In carrying out the present invention, the roller position restricting portion may be formed of a convex portion that is bent inward and protrudes inward. Even if the convex portion of the outer ring having such a simple structure is used, the occurrence of skew can be easily suppressed.

  By the way, the double-row shell needle roller bearing described in Patent Document 1 is usually manufactured as follows. First, only one end of a cylindrical member such as mild steel that is a material of the outer ring is bent inward to form a flange. Next, heat treatment (carburizing quenching / tempering) is performed so that the cylindrical member has a required hardness. In this case, the other end portion of the cylindrical member is subjected to a carbon-proof treatment so as not to be carburized. After the heat treatment, a cage is completed by incorporating a cage and needle rollers from the other end portion side of the cylindrical member and bending the other end portion of the cylindrical member inward to form a collar portion.

  In this double row shell needle roller bearing manufacturing method, the rigidity of the one end of the previously bent cylindrical member is different from that of the other end that is not bent. The outer peripheral surface is warped, and the opening end is easy to open in a trumpet shape. For this reason, there is a problem that the roundness of the outer ring is remarkably deteriorated when the double-row shell-type needle roller bearing is for a large-diameter rotating shaft. On the other hand, in the single row shell needle roller bearing, a manufacturing method different from the above-described manufacturing method of the double row shell needle roller bearing is adopted. That is, both ends of a cylindrical member such as mild steel that is a material of the outer ring are bent inward to form both flanges, and then the entire cylindrical member including both flanges is obtained so that the required hardness can be obtained. Heat treatment (carburizing and tempering) to complete the outer ring. Then, a bearing is completed by putting a cage in the outer ring and fitting needle rollers from the inside for each pocket of the cage. According to this manufacturing method, the rigidity of the heel is substantially the same on the one end side and the other end side of the outer ring, and distortion and deformation of the outer ring during heat treatment can be suppressed.

  Therefore, in the manufacturing method of the double row shell needle roller bearing, similarly to the manufacturing method of the single row shell needle roller bearing, the outer ring is heat-treated with both ends of the cylindrical member bent first. If formed, the accuracy of the roundness of the outer ring can be improved. However, the double row shell needle roller bearings have a longer cage axial length than the single row shell needle roller bearings. There is a situation in which the central part of the vessel is deformed (falling occurs), and the needle rollers cannot be arranged at an accurate position. For this reason, development of the technique for manufacturing a double row shell type needle roller bearing by the manufacturing method similar to a single row shell type needle roller bearing was also desired.

  In order to solve this new problem, the inner diameter position of the roller position restricting portion may be set to be substantially the same as the height of the flange portion of the outer ring. According to this, in a state where the needle rollers are fitted in the pockets of the cage, the cage is brought into contact with the roller position restricting portion and positioned in the radial direction. For this reason, the outer peripheral portion of the cage does not follow the needle rollers at the time of the fitting operation, and the deformation of the cage can be satisfactorily prevented. As a result, at the stage where the roller position restricting portion incorporates the needle roller into the cage, deformation of the cage is prevented, and after the needle roller is incorporated into the cage, the needle roller is positioned in the axial direction. To function.

a. First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side cross-sectional view showing the main part of a double row shell needle roller bearing according to a first embodiment of the present invention. This double row shell needle roller bearing includes an outer ring 10, cages 20 and 20, two rows of needle rollers 30 and 30, and a ring-shaped member 40.

  The outer ring 10 has a thin cylindrical shape, and includes flanges 11 at both ends thereof. Both flanges 11 are bent inward so that substantially the same inner diameter is formed, and are constituted by a bent portion 11a and an edge portion 11b. The edge part 11b of each collar part 11 is integrally extended from the front-end | tip of the bending part 11a toward the outer side end surface 31 of the needle roller 30 of each row | line | column, and contact | abuts to the outer side end surface 31 of the needle roller 30 of each row | line | column. Positioning of the needle rollers 30 in each row on the outer side in the axial direction (one side in the axial direction) is performed.

  The cages 20 and 20 have a thin cylindrical shape, are accommodated in the outer ring 10, and include pockets 21 and 21 for preventing the needle rollers 30 and 30 from falling off. Each pocket 21 has a rectangular shape, and a plurality of pockets 21 are provided at equal intervals in the circumferential direction. The outer diameter of each cage 20 is formed by a predetermined amount smaller than the pitch circle diameter of the needle rollers 30 in each row. The width in the circumferential direction of each pocket 21 is formed slightly smaller than the diameter of the needle rollers 30 in each row, and the longitudinal length in the axial direction of each pocket 21 is greater than that of the needle rollers 30 in each row. Is also formed slightly larger.

  The needle rollers 30 in each row are held by the inner peripheral surface of the outer ring 10 and the pocket 21 of the cage 20 so as to be rotatable around the axis of each roller and to be able to roll along the inner peripheral surface of the outer ring 10. ing.

  The ring-shaped member 40 (roller position restricting portion) is formed of, for example, resin, spring steel, or the like, and as shown in FIG. 2, the slit 41 is inclined with respect to the radial direction from the outer peripheral portion to the inner peripheral portion. And is elastically deformable in a direction in which the outer diameter decreases in accordance with the approach of the end faces 42 facing each other. The ring-shaped member 40 is disposed at the central portion of the inner peripheral portion of the outer ring 10 and is in firm contact with the inner peripheral surface of the outer ring 10 by an elastic return force in the direction in which the outer diameter increases.

  The ring-shaped member 40 abuts the inner end surface 32 of each row of needle rollers 30 at each end surface 42 and positions each row of needle rollers 30 in the axial direction (the other side in the axial direction). Further, the ring-shaped member 40 is set to a thickness that is substantially the same as the height of the edge portion 11 b of the flange portion 11 in the outer ring 10 in a state of being incorporated in the inner peripheral portion of the outer ring 10.

  By the way, the above-mentioned double row shell needle roller bearing is manufactured through each process described below. First, in the forming process, both ends 11 and 11 are formed by bending both ends inward while forming mild steel or the like as a material of the outer ring 10 into a cylindrical shape by drawing or the like. Next, in the heat treatment step, the entire cylindrical member including both flanges 11 and 11 is heat-treated (carburizing and tempering) so that the required hardness is obtained, and the outer ring 10 is completed. Next, in the assembling process, the ring-shaped member 40 is assembled in the outer ring 10. The outer diameter of the ring-shaped member 40 is set to be larger than the inner diameter of the edge portion 11b of the flange portion 11, but the inner diameter of the edge portion 11b is elastically deformed so that the outer diameter of the outer peripheral portion is reduced. It becomes a size that can be inserted into the outer ring 10. In the roller fitting step, the needle rollers 30 of each row are fitted from the inside for each pocket 21 of each cage 20 with both the cages 20, 20 placed in the outer ring 10.

  In 1st Embodiment comprised as mentioned above, in the roller fitting process, the outer peripheral part of each holder | retainer 20 is a state in which the needle roller 30 of each row | line | column is inserted in the pocket 21 of each holder | retainer 20. Positioned in the radial direction by contacting the edge 12b of the portion 11 and the inner peripheral portion of the ring-shaped member 40. For this reason, the outer peripheral portion of each cage 20 does not follow the needle rollers 30 in each row during the fitting operation, and the deformation of each cage 20 is prevented satisfactorily.

  In the first embodiment, after completion of the bearing, the needle rollers 30 in each row are positioned on the outer sides in the axial direction by contact with the edge portion 11b of the flange portion 11 in the outer ring 10 to form a ring shape. Positioning is made on the inner side in each axial direction by contact with each end face 42 of the member 40. For this reason, it is difficult for the needle rollers 30 in each row to fall with respect to the center line of the bearing, and the occurrence of skew can be suppressed.

  Further, in the first embodiment, the ring-shaped member 40 is separate from the outer ring 10 and is formed so as to be elastically deformable at least in the direction in which the outer diameter is reduced. Accordingly, the ring-shaped member 40 can be easily incorporated into the outer ring 10 by elastically bending the ring-shaped member 40 in the direction in which the outer diameter decreases, and by using the ring-shaped member 40 having such a simple configuration. The occurrence of skew can be easily suppressed.

  In the first embodiment, a slit 41 that is inclined with respect to the radial direction from the outer peripheral portion to the inner peripheral portion of the ring-shaped member 40 is formed. As a result, even if the needle rollers 30 in each row move in the circumferential direction while sliding on the end faces 42 of the ring-shaped member 40 as the rotary shaft rotates, the needle rollers 30 are prevented from being caught with the slits 41. Thus, smooth movement of the needle rollers 30 in each row with respect to the ring-shaped member 40 can be ensured.

b. Second Embodiment In the first embodiment described above, the ring-shaped member 40 functions as a roller position restricting portion. Instead, for example, as shown in FIGS. 3 and 4, the center of the outer ring 10 ′ is used. The convex portion 12 formed by bending the portion and projecting inward may serve as a roller position restricting portion. In addition, since the other structure is the same as that of the said 1st Embodiment, the member which performs the same function as the said 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

  The convex portion 12 is continuously formed in the circumferential direction of the outer ring 10 ′, and abuts against the inner end face 32 of each row of needle rollers 30 at each side surface 12 a, and each row of needle rollers 30. Positioning is performed on the inner side in the axial direction (the other side in the axial direction). In addition, the inner diameter position of the inner peripheral portion of the convex portion 12 is set so that the height of the convex portion 12 is substantially the same as the height of the edge portion 11 b of the flange portion 11 in the outer ring 10.

  Even if the convex portion 12 of the outer ring 10 ′ having such a simple configuration is used, the occurrence of skew can be easily suppressed.

(Modified embodiment)
In the above-described second embodiment, the convex portions 12 are continuously formed in the circumferential direction of the outer ring 10 ′. However, the present invention is not limited to this, and for example, as shown in FIG. You may make it form intermittently in the circumferential direction of outer ring | wheel 10 '' with the space | interval which can position each axial direction inner side (axial direction other side) of the roller 30. FIG.

The side sectional view showing the important section of the double row shell type needle roller bearing concerning a 1st embodiment of the present invention. The front view of the ring-shaped member of FIG. Side surface sectional drawing which shows the principal part of the double row shell type needle roller bearing which concerns on 2nd Embodiment of this invention. The external view of FIG. The partial external view of the double row shell type needle roller bearing which concerns on the deformation | transformation embodiment of 2nd Embodiment of this invention. The schematic diagram which shows the skew of a roller.

Explanation of symbols

10, 10 ', 10''outer ring 11 flange 11a bent part 11b edge 12 convex part (roller position regulating part)
12a Side surface 20 of convex portion 12 Cage 21 Pocket 30 Needle roller 31 Outer end surface 32 of needle roller 30 Inner end surface 40 of needle roller 30 Ring-shaped member (roller position restricting portion)
41 slit 42 end face of ring-shaped member 40

Claims (3)

In the double row roller bearing configured such that the double row rollers accommodated in the pocket of the cage are positioned on one side in the axial direction by contact with the flange provided on the outer ring,
The flange portion of the outer ring is bent inward so that substantially the same inner diameter is formed, and a bent portion and an edge portion that integrally extends from the tip of the bent portion toward each outer end face of the double row rollers. Configured,
Between the end faces of the double row rollers facing each other in the axial direction, a roller position restricting portion is provided that contacts the end face of each roller and positions the other side in the axial direction of each roller ,
A double row roller bearing , wherein an inner diameter position of the roller position restricting portion is set to be substantially the same as a height of a flange portion of the outer ring .   2. The double row roller bearing according to claim 1, wherein the roller position restricting portion is formed of a ring-shaped member that is separate from the outer ring and is elastically deformable at least in a direction in which the outer diameter is reduced.   2. The double row roller bearing according to claim 1, wherein the roller position restricting portion includes a convex portion that is bent inward at a center portion of the outer ring and protrudes inward.

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