JP2013177984A - Roller with retainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide rollers with a retainer capable of improving lubrication action.SOLUTION: In rollers with a retainer, the rollers 3 are housed in respective pockets 2 provided at multiple portions in the circumferential direction in a cylindrical retainer 1, and ridges 4, 5 for preventing the roller from coming out of position are provided at opening edges at the inner diameter side and outer diameter side of side surfaces facing each other in the circumferential direction of the retainer 1, of each pocket 2. Roller guide surfaces 6 for guiding the rollers 3 are provided at both end positions more outside the axial direction from the ridges 4, 5 on the side surface of each pocket 2. The ridges at the inner diameter side and the outer diameter side are provided at positions where the ridges are partially overlapped with each other in the axial direction.

Description

  The present invention relates to a roller with a cage used as a bearing in various industrial machines in an external lubrication type.

  As this type of roller with cage, needle rollers are accommodated in each pocket at a plurality of locations in the circumferential direction of the cylindrical cage, and rollers are provided on the inner diameter side and outer diameter side of the side surfaces of the pockets facing the circumferential direction of the cage. A needle roller with a cage provided with a stopper is known (for example, Patent Document 1). In Patent Document 1, the outer diameter side roller stopper and the inner diameter roller stopper are arranged at positions different from each other in the axial direction, so that lubricating oil can flow into the pocket from between the roller stoppers. An improvement of the lubricating action is disclosed.

  Another example of a needle roller with a cage in which roller stoppers are provided on the outer diameter side and the inner diameter side of the side surfaces facing the circumferential direction of the pocket is Patent Document 2. This is because a notch is provided at both axial ends and both ends of the side surface of the pocket, the roller stoppers are disposed between both ends and the notches in the intermediate portion, and the notches at the intermediate portion of the outer diameter surface of the cage are provided. By providing a circumferential groove at a position corresponding to, the lubrication action is improved.

Japanese Unexamined Patent Publication No. 7-29369 JP-A-7-103240

  According to the needle roller with cage of each configuration described above, the flow of lubricating oil into the pocket can be improved and the lubrication action can be improved, but now the conditions of use of the roller with cage have become more severe. Therefore, it is necessary to further improve the lubricating action.

  An object of the present invention is to provide a roller with a cage capable of improving a lubricating action.

The roller with cage according to the present invention accommodates a roller in each of a plurality of pockets in the circumferential direction provided in a cylindrical cage, and the inner diameter side and the outer diameter side of the side surfaces of the pockets facing the circumferential direction of the cage. In the roller with retainer provided with roller drop prevention ridges on the opening edge, roller guide surfaces for guiding the rollers at different axial positions from the roller drop prevention ridges on the side surfaces of the pockets are provided. .
According to this configuration, since the roller guide surface for guiding the roller is provided at an axial position different from each roller drop prevention ridge, a space where lubricating oil easily flows around the roller drop prevention ridge is generated. It will be. As a result, the lubricating action can be improved.

  The roller guide surfaces are provided at both end positions on the outer side in the axial direction with respect to the roller drop-preventing protrusions on the side surfaces of the pockets. In the case of this configuration, roller skew can be reduced.

  The cage is made of resin, and the roller fall-preventing protrusions on the inner diameter side and the outer diameter side are provided at positions that partially overlap each other in the axial direction. In this way, by providing the inner and outer roller drop ridges in positions that partially overlap each other in the axial direction, the roller drop ridges are long enough to obtain a stable roller drop prevention function. In this way, it is possible to prevent the lubricating oil from entering and exiting the pockets from being obstructed by the roller dropping protrusion.

  In the present invention, annular recesses that are recessed toward the outer diameter side with respect to the axially intermediate portion are provided on both ends in the axial direction of the inner diameter surface of the cage, and the axially inner end positions of these annular recesses are defined as described above. The position may be closer to the center in the axial direction than the roller guide surface, and closer to the roller guide surface than the roller drop prevention protrusion on the inner diameter side.

  In this invention, the radial depth dimension of the annular recess may be a dimension that prevents the roller from being removed from the roller guide surface even when the roller is most biased toward the inner diameter side.

  In the present invention, the outer diameter side roller drop protrusions are provided at two positions on both axial ends, and the inner diameter roller drop protrusion is at an axially intermediate position and the two positions. One of the outer diameter side roller drop-preventing protrusions may be provided at a position partially overlapping with each other in the axial direction. In the case of this configuration, a more stable roller drop prevention function and good entry / exit of the lubricating oil with respect to the pocket can be obtained.

  In the present invention, a plurality of roller fall-preventing protrusions on the inner diameter side may be provided apart from each other in the axial direction. When there are a plurality of roller fall-preventing protrusions on the inner diameter side that are separated from each other in the axial direction, the lubrication oil for the pockets is better than when a long roller drop-preventing protrusion is provided in the axial direction. Get in and out.

  In this invention, it is good also considering the part except each said roller fall prevention protrusion and the said roller guide surface in the side surface of each said pocket as the same plane. This simplifies the design and manufacture of the cage.

In any one of the above configurations of the present invention, a plurality of recesses may be dispersedly formed on the outer diameter surface of the cage, and a part of the plurality of recesses may be continued to the opening edge of the pocket. good.
According to this configuration, the lubricating oil can easily flow into the pocket through the concave portion of the outer diameter surface of the cage, so that the lubricating action can be improved.

  When a plurality of recesses are provided on the outer diameter surface of the cage as described above, some or all of these recesses are connected to each other to form an integrated recess area. It may be. In the case of this configuration, since the flow path of the lubricating oil that reaches the pocket through the recess is formed, the lubricating oil is more likely to flow into the pocket.

  The roller with cage according to the present invention accommodates a roller in each of a plurality of pockets in the circumferential direction provided in a cylindrical resin cage, and the inner diameter side and the outer side of each pocket facing the circumferential direction of the cage. In a roller with a retainer provided with a roller drop-preventing ridge on the opening edge on the diameter side, the rollers are guided to both end positions in the axially outer side of the roller drop-preventing protrusion on the side surface of each pocket. Since the roller guide surface is provided and the roller fall-preventing protrusions on the inner diameter side and the outer diameter side are provided at positions where parts thereof overlap each other in the axial direction, the lubrication action can be improved.

(A) is sectional drawing of the roller with a retainer concerning 1st Embodiment of this invention, (B) is the II arrow expanded sectional view in (A), (C) is II-II in (A). FIG. It is explanatory drawing of the width dimension of the groove part in the holder | retainer of the roller with the holder. (A), (B) is sectional drawing of the holder | retainer in the roller with a holder | requirement concerning other embodiment of this invention, respectively. (A) is a top view of the recessed part of the cage outer diameter surface in the roller with cage according to still another embodiment, (B) is a front view of the cage outer diameter surface, and (C) is IV in (B). -IV is an enlarged cross-sectional view taken along arrow. It is sectional drawing of the roller with a retainer concerning a proposal example. (A) is a front view of the outer diameter surface of the cage in the roller with the cage, and (B) is an enlarged cross-sectional view taken along line VV in (A). (A) is a top view of the other example of the recessed part of the retainer outer diameter surface in the roller with a retainer concerning further another embodiment of this invention, (B) is the plane of the retainer outer diameter surface which provided the recessed part. FIG. (A) is a top view of the further another example of the recessed part of the retainer outer diameter surface in the roller with the retainer, (B) is a top view of the retainer outer diameter surface provided with the recessed part. (A) is a top view of the further another example of the recessed part of the retainer outer diameter surface in the roller with the retainer, (B) is a top view of the retainer outer diameter surface provided with the recessed part. (A) is a top view of the further another example of the recessed part of the retainer outer diameter surface in the roller with the retainer, (B) is a top view of the retainer outer diameter surface provided with the recessed part. (A) is a top view of the further another example of the recessed part of the retainer outer diameter surface in the roller with the retainer, (B) is a top view of the retainer outer diameter surface provided with the recessed part. (A) is a top view of the further another example of the recessed part of the retainer outer diameter surface in the roller with the retainer, (B) is a top view of the retainer outer diameter surface provided with the recessed part. (A) is a top view of the further another example of the recessed part of the retainer outer diameter surface in the roller with the retainer, (B) is a top view of the retainer outer diameter surface provided with the recessed part. (A) is a top view of the further another example of the recessed part of the retainer outer diameter surface in the roller with the retainer, (B) is a top view of the retainer outer diameter surface provided with the recessed part.

  A first embodiment of the present invention will be described with reference to FIGS. This roller with a cage is a needle roller with a cage in which needle rollers 3 are accommodated in a plurality of pockets 2 provided in a cylindrical cage 1. The cage 1 is formed of a cylindrical synthetic resin molded product, and a plurality of pockets 2 each containing a roller 3 are formed side by side in the circumferential direction. Each pocket 2 is provided so as to penetrate inside and outside in the middle of the cage 1 in the axial direction. By forming these pockets 2, the cage 1 is adjacent to the annular portions 1a on both sides. It has a ladder shape formed of a plurality of pillar portions 1b connecting the annular portions 1a on both sides between the pockets 2. Note that FIG. 1A showing a cross-sectional view of the cage 1 shows only some of the pockets 2 and omits others. FIG. 1B is an enlarged cross-sectional view taken along the arrow I-I in FIG. On the side surfaces of the pocket 2 facing in the circumferential direction of the cage, ridges 4 and 5 for preventing roller fall are provided on the opening edges on the inner diameter side and the outer diameter side, respectively. A roller guide surface 6 for guiding the roller 3 is provided on the side surface of the pocket.

  The roller fall-preventing protrusions 4 and 5 on the inner diameter side and the outer diameter side are provided at positions where parts thereof overlap each other in the axial direction. Specifically, the roller fall-preventing protrusion 5 on the outer diameter side is provided at two positions on both ends in the axial direction. The inner side roller drop-preventing ridge 4 is provided at one position at an axially intermediate position and a portion of the two outer diameter side roller drop-preventing ridges 5 and 5 that partially overlap each other in the axial direction. .

One roller guide surface 6 is provided at each end of the pocket 2 on the outer side in the axial direction of the roller drop-preventing protrusions 4 and 5 on the side surface of the pocket 2. Further, the portions of the side surface of the pocket 2 except for the roller drop-preventing protrusions 4 and 5 and the guide surface 6 are the same plane. The roller guide surface 6 forms a surface that locally protrudes from the portion that is the same plane on the side surface of the pocket 2.
FIG. 1C shows an example of a cross-sectional shape of the roller guide surface 6. As shown in the figure, the roller guide surface 6 is composed of a tip end surface of the protruding portion, and is a plane parallel to a plane in the cage radial direction (a plane including the cage center) at the center in the width direction of the pocket 2. Yes. The roller guide surface 6 is not necessarily limited to the flat surface as described above. For example, the roller guide surface 6 may be a flat inclined surface that is inclined obliquely toward the outer diameter side of the cage or the inner diameter side of the cage. It is formed in a curved surface having an arc shape with a slightly larger radius of curvature.

  At both ends in the axial direction of the inner diameter surface of the cage 1, annular recess portions 7 that are recessed toward the outer diameter side with respect to the axially intermediate portion are provided over the entire circumference. The width of the annular recess 7 is wider than the annular portion 1a of the retainer 1, and the width extends over the entire annular portion 1a and a part of the column portion 1b. Specifically, the width dimension of the annular recess 7 is a dimension in the range of W1 or more and W2 or less shown in FIG. 2A and 2B show examples in which the annular recess 7 is set to have a minimum width and a maximum width within an allowable range. That is, the axially inner end position of the annular recess 7 has the smallest width W1 as the axially inner end of the roller guide surface 6 as shown in FIG. 2A, and the inner diameter as shown in FIG. The width W2 as the outer end of the roller drop-preventing protrusion 4 on the side is the maximum, and is appropriately designed within this range. In addition, when the radial direction depth of the said annular recessed part 7 becomes deep, since the inner diameter side end of the roller guide surface 6 will recede to an outer diameter side, the possibility that the roller 3 will remove | deviate from the roller guide surface 6 so much arises. Therefore, the depth of the annular recess 7 in the radial direction is set such that the roller 3 is not detached from the roller guide surface 6 even when the roller 3 is most biased to the inner diameter side.

  Thus, in this roller with cage, the roller guide surface 6 for guiding the roller 3 is provided at an axial position different from each roller drop-preventing protrusion 4, 5 on the side surface of each pocket 2. A space in which the lubricating oil easily flows is formed around the roller drop preventing protrusions 4 and 5, thereby improving the lubricating action.

  In this embodiment, since the roller guide surface 6 is provided at both end positions on the outer side in the axial direction from the roller drop-preventing protrusions 4 and 5 on the side surface of each pocket 2, the skew of the roller 3 is reduced. Can do.

In the above-described embodiment, one roller dropping stopper 4 on the inner diameter side is provided. However, as shown in FIGS. 3A and 3B, the roller dropping protrusion 4 on the inner diameter side is provided. A plurality of them may be provided apart from each other in the axial direction. 3 (A) and 3 (B) are examples in which the annular recess 7 is set to have a minimum width and a maximum width within an allowable range.
When there are a plurality of roller fall-preventing protrusions 4 on the inner diameter side spaced apart as shown in the figure, when a long roller drop-off protrusion 4 is provided in the axial direction as in the above embodiment, In comparison, good entry / exit of the lubricating oil with respect to the pocket 2 can be obtained.

  FIG. 4 shows still another embodiment of the present invention. In the roller with cage of this embodiment, in the embodiment of FIG. 1, a plurality of concave portions 8 having a circular planar shape as shown in FIG. ) And formed in a distributed manner in the circumferential direction and the axial direction. FIG. 4C shows an enlarged cross-sectional view taken along arrow IV-IV in FIG. Among the plurality of recesses 8, some of the recesses 8 are continuous with the opening edge of the pocket 2. Other configurations are the same as those in the embodiment of FIG.

  Thus, when the plurality of recesses 8 are formed in a distributed manner on the outer diameter surface of the cage 1, the lubricating oil can easily flow into the pockets 2 through the recesses 8, so that the lubrication action can be improved.

  5 and 6 show examples of reference proposals. In this proposed example, the roller guide surface 6 is omitted from the embodiment of FIG. In other words, the roller with cage of this proposed example is a needle roller with cage, in which the needle roller 3 is accommodated in each of the plurality of pockets 2 provided in the cylindrical cage 1. The cage 1 is made of a molded product of a cylindrical synthetic resin, and a large number of pockets 2 each containing rollers 3 are formed side by side in the circumferential direction. 5 showing a sectional view of the cage 1, only a part of the pockets 2 is shown. On the side surfaces of the pocket 2 facing in the circumferential direction of the cage, ridges 4 and 5 for preventing roller fall are provided on the opening edges on the inner diameter side and the outer diameter side, respectively. Each of the roller fall-preventing protrusions 4 and 5 on the inner diameter side and the outer diameter side is provided at one central position in the axial direction. The roller guide surface 6 in the embodiment of FIG. 1 is not provided. As in the case of the embodiment of FIG. 2, a plurality of concave portions 8 having a circular planar shape are arranged on the outer diameter surface of the cage 1 in the circumferential direction and the axial direction in a distributed manner as shown in FIG. It is a thing. FIG. 6B shows an enlarged cross-sectional view taken along the line V-V in FIG. Among the plurality of recesses 8, some of the recesses 8 are continuous with the opening edge of the pocket 2.

  In the case of this proposed example as well, in the same way as in the embodiment of FIG. 2, the lubricating oil can easily flow into the pocket 2 through the recessed portions 8 formed in a distributed manner on the outer diameter surface of the cage 1. Is possible.

  FIG. 7 shows another configuration example of the concave portion 8 on the outer diameter surface of the cage in the roller with cage of the embodiment shown in FIG. In this configuration example, as shown in FIG. 7A, a plurality of recesses 8 </ b> A whose planar shape is a dharma-shaped connecting circle in which two circles partially overlap each other are formed on the outer diameter surface of the cage 1 in the circumferential direction. They are distributed in the axial direction. A part of the recesses A is continuous with the opening edge of the pocket 2. Also in this configuration example, the lubricating oil can easily flow into the pocket 2 through the recessed portions 8A formed in a distributed manner, so that the lubricating action can be improved.

FIG. 8 shows still another configuration example of the concave portion 8 on the outer diameter surface of the cage in the roller with cage of FIG. In this configuration example, as shown in FIG. 8 (A), a plurality of concave portions 8 having a circular planar shape arranged in the circumferential direction are connected by a groove portion 8a to form an integral concave portion area 8B, and the concave portion area 8B is formed in the axial direction. Multiple items are arranged. A part of the recessed area 8 </ b> B continues to the opening edge of the pocket 2.
Also in this configuration example, the lubricating oil can easily flow into the pocket 2 through the recessed area 8B, so that the lubricating action can be improved.

FIG. 9 shows still another configuration example of the concave portion 8 on the outer diameter surface of the cage in the roller with cage shown in FIG. In this configuration example, as shown in FIG. 9A, a plurality of concave portions 8 having a circular planar shape arranged in the axial direction are connected by a groove portion 8b to form an integral concave portion area 8C, and the concave portion area 8C is arranged in the circumferential direction. Multiple items are arranged. A part of the recessed area 8 </ b> C is assumed to follow the opening edge of the pocket 2.
Also in this configuration example, the lubricating oil can easily flow into the pocket 2 through the recessed area 8C, so that the lubricating action can be improved.

FIG. 10 shows still another configuration example of the concave portion 8 on the outer diameter surface of the cage in the roller with cage shown in FIG. In this configuration example, as shown in FIG. 10A, among the plurality of concave portions 8 having a circular planar shape arranged in the circumferential direction and the axial direction, a plurality of concave portions 8 arranged obliquely are connected by a groove portion 8c to be integrated. This is a recessed area 8D. A part of the recessed area 8 </ b> D is assumed to follow the opening edge of the pocket 2.
Also in this configuration example, the lubricating oil can easily flow into the pocket 2 through the recessed area 8D, so that the lubricating action can be improved.

FIG. 11 shows still another configuration example of the concave portion 8 on the outer diameter surface of the cage in the roller with cage shown in FIG. In this configuration example, as shown in FIG. 11A, among the plurality of recesses 8 having a circular planar shape arranged in the circumferential direction and the axial direction, the plurality of recesses 8 arranged in the circumferential direction are connected by the groove 8a. A plurality of recessed portions 8 arranged obliquely are connected by a groove portion 8c to form an integrated recessed portion area 8E. A part of the recessed area 8E is assumed to follow the opening edge of the pocket 2.
Also in this configuration example, the lubricating oil can easily flow into the pocket 2 through the recessed area 8E, so that the lubricating action can be improved.

FIG. 12 shows still another configuration example of the concave portion 8 on the outer diameter surface of the cage in the roller with cage shown in FIG. In this configuration example, among the plurality of concave portions 8 having a circular planar shape arranged in the circumferential direction and the axial direction as shown in FIG. 12A, the plurality of concave portions 8 arranged in the axial direction are coupled by the groove portion 8b. A plurality of recessed portions 8 arranged obliquely are connected by a groove portion 8c to form an integrated recessed portion area 8F. A part of the recessed area 8 </ b> F continues to the opening edge of the pocket 2.
Also in this configuration example, the lubricating oil can easily flow into the pocket 2 through the recessed area 8F, so that the lubricating action can be improved.

FIG. 13 shows still another configuration example of the concave portion 8 on the outer diameter surface of the cage in the roller with cage shown in FIG. In this configuration example, among the plurality of recesses 8 having a circular planar shape arranged in the circumferential direction and the axial direction as shown in FIG. 13A, the plurality of recesses 8 arranged in the circumferential direction are formed by grooves 8a in the axial direction. A plurality of recesses 8 arranged in a row are connected by a groove 8b, and a plurality of recesses 8 arranged obliquely are connected by a groove 8c to form an integrated recess region 8G. A part of the recessed area 8G is assumed to follow the opening edge of the pocket 2.
Also in this configuration example, the lubricating oil can easily flow into the pocket 2 through the recessed area 8G, so that the lubricating action can be improved.

FIG. 14 shows still another configuration example of the concave portion 8 on the outer diameter surface of the cage in the roller with cage of FIG. In this configuration example, as shown in FIG. 14A, among the plurality of recesses 8 having a circular planar shape arranged in the circumferential direction and the axial direction, the plurality of recesses 8 arranged in the circumferential direction are formed by grooves 8a in the axial direction. A plurality of recesses 8 arranged in a row are connected to each other by a groove 8b to form an integrated recess region 8H. A part of the recessed area 8 </ b> H is assumed to follow the opening edge of the pocket 2.
Also in this configuration example, the lubricating oil can easily flow into the pocket 2 through the recessed area 8H, so that the lubricating action can be improved.

  In addition, you may apply the recessed part 8A and recessed part area | region 8B-8H of the structural example of FIGS. 7-14 to the outer diameter surface of the holder | retainer 1 in the roller with a holder in embodiment of FIG.

DESCRIPTION OF SYMBOLS 1 ... Cage 2 ... Pocket 3 ... Needle roller 4 ... Roller fall prevention protrusion 5 on an inner diameter side ... Roller fall prevention protrusion 6 on an outer diameter side ... Roller guide surface 7 ... Annular recesses 8, 8A ... Recesses 8B-8H ... recessed area

Claims (7)

Rollers are housed in multiple pockets in the circumferential direction provided on the cylindrical resin cage, and the rollers fall off at the opening edges on the inner and outer diameter sides of the pockets facing the circumferential direction of the cage. In rollers with cages provided with protrusions,
Roller guide surfaces for guiding the rollers are provided at both end positions in the axially outer side of the roller drop prevention protrusions on the side surfaces of the pockets, and the roller drop prevention protrusions on the inner diameter side and the outer diameter side are A roller with a cage, characterized in that the rollers are provided at positions that partially overlap each other in the axial direction.   In Claim 1, the annular dent part which dents to the outside diameter side to the axial direction middle part is provided in the axial direction both ends of the inner diameter side of the above-mentioned cage, and the axial direction inner end position of these annular dent parts is provided. A roller with a cage that is positioned closer to the center in the axial direction than the roller guide surface and closer to the roller guide surface than the roller drop prevention protrusion on the inner diameter side.   3. The roller with a retainer according to claim 2, wherein a radial depth dimension of the annular recess is a dimension in which the roller does not come off from the roller guide surface even when the roller is most biased toward the inner diameter side.   In any one of Claims 1 thru / or Claim 3, the outer diameter side roller drop prevention protrusion is provided at two positions in the axial direction both ends, and the inner diameter side roller drop prevention protrusion is A roller with a cage provided at one position at an axially intermediate position and at a position where the two outer diameter side roller drop-preventing protrusions partially overlap each other in the axial direction.   The roller with a retainer according to any one of claims 1 to 4, wherein a plurality of the roller fall-preventing protrusions on the inner diameter side are provided apart from each other in the axial direction.   In any 1 paragraph of Claims 1 thru / or 5, A plurality of crevices are distributed and formed in the outside diameter surface of the above-mentioned retainer, and some crevices among these crevices are formed in the opening edge of the pocket Roller with cage to be continued.   The roller with a cage according to claim 6, wherein a part or all of the plurality of recesses are connected to each other to form an integrated recess area.

Images