JP2008038991A - Needle roller bearing with hook - Google Patents

Abstract

Provided is a needle roller bearing with a hook capable of easily improving lubricity without separately providing a lubricating device.
A needle roller bearing with a flange includes a plurality of needle rollers, a retainer that holds the plurality of needle rollers, and an outer ring raceway surface on which the needle rollers roll on an inner peripheral surface. And an outer ring 11 having a pair of flanges 17 projecting radially inward on both axial sides of the outer ring raceway surface 11a. At least one groove portion 18 is formed in each of the pair of flange portions 17 in the circumferential direction.
[Selection] Figure 1

Description

  The present invention relates to a needle roller bearing with a hook, and more particularly to a needle roller bearing with a hook used in automobiles and various industrial machines such as a rotating part of a transmission.

  Conventionally, needle roller bearings using needle rollers having a relatively small diameter and a length longer than the diameter have been used. As needle roller bearings, cage and rollers, shell needle roller bearings, solid needle roller bearings, and the like have been devised. The cage and roller is composed of a cage that holds the roller place, and the shell needle roller bearing is constructed by incorporating a needle roller with a cage into a race ring manufactured by precision deep drawing from a thin steel plate, The solid needle roller bearing is constructed by incorporating a needle roller with a cage into a machined raceway ring.

  For example, in the cage and roller 100 shown in FIG. 5, a plurality of needle rollers 102 held by the cage 101 are disposed between the housing 103 and the inner ring 105 that is externally fitted to the rotary shaft 104. In the solid needle roller bearing 110 without wrinkles shown in FIG. 6, a plurality of needle rollers 102 held by a cage 101 are externally fitted to an outer ring 106 fitted in a housing 103 and a rotary shaft 104. Between the inner rings 105.

  In the needle roller bearings as shown in FIGS. 5 and 6, the supply and discharge of the lubricating oil are evenly distributed on the outer diameter side of the inner ring 105 where the needle rollers 102 are disposed and on the inner diameter side of the outer ring 106 or the housing 103. Done.

  On the other hand, as shown in FIG. 7, in the solid needle roller bearing 120 with flanges provided with flanges 107 at both ends of the outer ring 106 so as to support the needle rollers 102, the flanges of the outer ring 106 are provided. 107 causes the supply and discharge of the lubricating oil to be delayed, making it difficult for the lubricating oil to enter the inner diameter side of the outer ring 106 and poor lubricity. As a result, when the inner ring 105, the needle roller 102, and the outer ring 106 are rotated at a relative rotational speed of zero during rotation, fretting wear is likely to occur, and there is a concern that seizure and rolling life may be reduced.

For this reason, various conventional bearings have been devised in which a device for supplying lubricating oil is separately provided to improve lubricity (see, for example, Patent Documents 1 to 4).
JP 2006-118525 A JP 2003-206938 A Japanese Utility Model Publication No. 5-86029 JP 11-280773 A

  However, when the lubricating devices described in Patent Documents 1 to 4 are separately provided, the size of the device is increased, and particularly when applied to a rotating portion of an automobile transmission, there is no space for providing these lubricating devices. It was.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hooked needle roller bearing that can easily improve lubricity without providing a separate lubricating device.

The above object of the present invention is achieved by the following configurations.
(1) A plurality of needle rollers, a cage for holding the plurality of needle rollers, a raceway surface on which the needle rollers roll on a circumferential surface, and a radial projection on both axial sides of the raceway surface A ring-shaped needle roller bearing provided with a bearing ring including a pair of flanges,
At least one groove part is formed in the circumferential direction in said pair of collar parts, respectively, The needle roller bearing with a collar characterized by the above-mentioned.
(2) The grooved needle roller bearing according to (1), wherein a depth of the groove is less than a protruding dimension of the flange.

  According to the present invention, at least one groove portion is formed in the circumferential direction in each of the pair of flange portions provided on the race, so that effective lubrication can be effectively performed on the entire bearing without separately providing a lubrication device. It is possible to suppress fretting wear and roller wear. In addition, the oil film moldability is improved with the improvement of the lubricity, the wear resistance and the seizure resistance can be improved, and the rolling life can be improved.

  Hereinafter, a needle roller bearing with a hook according to an embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, a needle roller bearing 10 with a flange includes an outer ring 11 having an outer ring raceway surface 11a on an inner peripheral surface, an inner ring 12 having an inner ring raceway surface 12a on an inner peripheral surface, an outer ring raceway surface 11a and an inner ring. A plurality of needle rollers 13 that are rotatably arranged between the raceway surfaces 12a, and a cage 14 in which a plurality of pockets that hold the plurality of needle rollers 13 are formed at equal intervals in the circumferential direction. .

  The outer ring 11 is fitted in a housing 15 of various devices such as an automobile, the inner ring 12 is fitted on a rotating shaft 16, and the hooked needle roller bearing 10 rotates the rotating shaft 16 with respect to the housing 15. Support freely.

  As shown also in FIG. 2, the outer ring 11 includes a pair of flanges 17 protruding radially inward on both axial sides of the outer ring raceway surface 11a, and guides the needle rollers 13 in the axial direction. The pair of flange portions 17 are formed with at least one groove portion 18 (four in the present embodiment) on the inner peripheral side at predetermined intervals in the circumferential direction, and provide lubricity to the outer ring raceway surface 11a. It is improving. The depth d of the groove portion 18 is set to be less than the projecting dimension of the flange portion 17 so as to reliably guide the needle roller 13 in the axial direction.

  Here, in the outer ring 11 of the shell-shaped needle roller bearing, the flange portion 17 is formed by bending the edge portion of the cylindrical material by press working. However, as shown in FIG. It is formed in advance on the edge end surface of the rim, and is directed radially inward by press working of the flange portion 17. On the other hand, since the outer ring 11 of the solid needle roller bearing is formed by machining, the groove portion 18 is formed simultaneously with the formation of the flange portion 17.

  In the needle roller bearing 10 with the flange configured in this way, as shown in FIG. 3, the supply and discharge of the lubricating oil are formed not only on the outer diameter side of the inner ring 12 but also on the flange portion 17 of the outer ring 11. This is also performed on the inner diameter side of the outer ring 11 through the groove 18. Thus, effective lubrication can be performed on the entire bearing without providing a separate lubrication device, and fretting wear and roller wear can be suppressed. In addition, the oil film moldability is improved with the improvement of the lubricity, the wear resistance and the seizure resistance can be improved, and the rolling life can be improved.

  Moreover, since the depth d of the groove part 18 formed in the collar part 17 is less than the protrusion dimension to the inner peripheral side of the collar part 17, it is favorable while maintaining the favorable guide state of the needle roller 13 by the collar part 17 Good lubricity can be obtained.

In addition, this invention is not limited to the thing of embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
In the needle roller bearing 10 with the flange according to the present embodiment, it is arranged between the outer ring raceway surface 11a of the outer ring 11 having the flange portion 17 and the inner ring raceway surface 12a of the inner ring 12, but the rotary shaft 16 is directly used without using the inner ring. It may be attached to.

Further, in this embodiment, the flange portion 17 is formed on the outer ring 11, but may be formed on the inner ring 12, and in this case, it is directly attached to the housing 15 without using the outer ring. May be.
Moreover, the groove part 18 should just be formed at least 1 in the circumferential direction in each collar part 17, and considers lubricity and the guide state of a needle roller, and is set to arbitrary numbers.

  Further, the flange portion 17 of the present embodiment is arranged so as to face the annular portion 14a of the retainer 14 in the radial direction. However, the flange portion 17 has an axial end surface of the annular portion 14a of the retainer 14. You may arrange | position so that it may oppose with the outer peripheral surface of the inner ring | wheel 12 so that it may surround.

It is sectional drawing which shows the needle roller bearing with a flange which concerns on one Embodiment of this invention. It is a perspective view which shows an outer ring | wheel. It is sectional drawing of the needle roller bearing with a hook which shows the flow of lubricating oil. It is a figure explaining the process in which a groove part is formed in a shell type needle roller bearing. It is sectional drawing which shows the structure of a general cage and roller. It is sectional drawing which shows the structure of a general wrinkleless needle roller bearing. It is sectional drawing of the conventional needle roller bearing with a flange.

Explanation of symbols

10 Needle roller bearing with flange 11 Outer ring (Raceway ring)
11a Outer ring raceway surface (track surface)
12 Inner ring 13 Needle roller 17 Groove 18 Groove

Claims (2)

A plurality of needle rollers, a cage for holding the plurality of needle rollers, a raceway surface on which the needle rollers roll on a peripheral surface, and a pair of flanges projecting radially on both axial sides of the raceway surface A roller bearing with a hook, and a needle roller bearing with a hook,
At least one groove part is formed in the circumferential direction in said pair of collar parts, respectively, The needle roller bearing with a collar characterized by the above-mentioned.   The hooked needle roller bearing according to claim 1, wherein a depth of the groove portion is less than a protruding dimension of the flange portion.

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