JP5909918B2 - Roller bearing cage - Google Patents

Description

  The present invention relates to a roller bearing retainer that can reduce the torque and weight while improving the roller assembly.

  Conventionally, various types of roller bearing cages are known in terms of cross-sectional shape and molding method (see, for example, Patent Documents 1 to 6). As an example, the radial roller bearing retainer has a hollow cylindrical shape concentrically formed around one central axis, and is a pair of annular rings arranged in a direction orthogonal to the central axis. And a plurality of pillar portions that extend between the flange portions and are provided at predetermined intervals along the circumferential direction (for example, at equal intervals), and provided between the circumferential directions of the plurality of pillar portions, It has a plurality of pockets in which a plurality of rollers can be rotatably assembled one by one. Each pocket is provided at a predetermined interval (for example, at equal intervals) along the circumferential direction.

  In this case, in a state where the roller bearing cage in which the roller is incorporated in each pocket is arranged as a bearing between the rotating members, or arranged as a cage between the inner and outer rings, the rotating member ( When the inner and outer rings) rotate relative to each other, each roller rolls accordingly, and the roller bearing retainer revolves together with each roller. As a result, the rotating member (inner and outer rings) can be kept relatively rotated smoothly.

JP 2002-310163 A JP-A-10-252747 JP 2010-133508 A Japanese Utility Model Publication No. 5-38419 JP 7-317774 A JP 2000-104739 A

  By the way, in the field of hybrid cars (HV), technological development that enables high-speed rotation to generate high output with a smaller motor is progressing, and in such circumstances, a planetary mechanism that performs gear shifting and torque transmission Cage & Roller “High-speed Rotation Type Miniature Planetary Cage & Roller” used in the industry is required to support low torque and light weight.

  However, when dealing with low torque and light weight, in the current roller bearing retainer, if the number of rollers is large, each column portion extending on both sides in the circumferential direction of each roller is narrowed accordingly. Therefore, it becomes difficult to improve (or keep constant) the strength of each of the pillars. In addition, when the number of rollers is small, each column portion becomes thicker by that amount, and the strength of each column portion can be improved. On the other hand, it becomes difficult to form the cage, and each roller is made one by one. The work to be incorporated in each pocket becomes difficult.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a roller bearing retainer that can reduce the torque and reduce the weight while improving the roller assemblability. It is to provide.

In order to achieve such an object, the present invention has a hollow cylindrical shape concentrically formed around one central axis, and a pair of opposingly arranged in a direction perpendicular to the central axis. An annular flange portion, a plurality of pillar portions extending between the flange portions and provided at predetermined intervals along the circumferential direction, and the pillar portion, a large diameter portion connected to the flange portion, It consists of a small-diameter portion at the central portion in the axial direction, and an inclined portion connecting the large-diameter portion and the small-diameter portion, and is provided between the circumferential directions of the plurality of column portions, and a plurality of rollers are rotatably incorporated one by one a bearing retainer rollers having a plurality of pockets that can, wherein the small diameter portion of the column sections, respectively, lubricating the bearings inner diameter passing through the column portion radially bearing outer diameter agent dummy hole for flowing the central position of the central and circumferential width of the axial length of the pillar portion Wherein it provided in parallel with the pocket, in addition to the each dummy holes, wherein the large diameter portion, and radially penetrates is formed smaller than the dummy hole, flow of lubricant from the bearing bore in the bearing outer diameter The sub dummy holes to be made are provided in the same phase as the dummy holes .
In the present invention, in each dummy hole, a circumferential dummy hole width is a and an axial dummy hole length is b, and in each column part, between each dummy hole and the pockets on both sides in the circumferential direction. When the circumferential column width of the extending portion is c, the circumferential pocket width is d and the axial pocket length is g in each pocket, the dummy holes are a <b and b <g And the circumferential dummy hole width a is set so as to satisfy the relationship c <d, so that the circumferential column width c is thinned and the entire column portion is formed. Give elasticity.

  ADVANTAGE OF THE INVENTION According to this invention, the roller bearing retainer which makes it possible to achieve low torque and weight reduction while improving roller assembly property is realizable.

(a) is a perspective view which shows the structure of the roller bearing retainer which concerns on one Embodiment of this invention, (b) shows typically the positional relationship of each pocket and dummy hole of a roller bearing retainer. Plan view. (a) is a plan view showing a partially enlarged configuration of a roller bearing retainer according to the first modification of the present invention, and (b) is for a roller bearing according to the second modification of the present invention. The top view which expands and shows a structure of a cage partially, (c) is a top view which expands and shows the structure of a roller bearing retainer concerning the 3rd modification of the present invention, (d) The top view which expands and shows partially the structure of the roller bearing retainer which concerns on the 4th modification of this invention.

  Hereinafter, a “roller bearing cage” according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this embodiment, a roller bearing retainer used in a planetary mechanism is assumed. Here, the planetary mechanism refers to a deceleration (acceleration) mechanism having a structure in which a plurality of planetary gears revolve while rotating around a sun gear. In this case, as a roller bearing retainer, a radial type retainer is incorporated in each planetary gear in a state where a plurality of rollers are retained therein.

  As shown in FIGS. 1 (a) and 1 (b), the roller bearing retainer 2 of the present embodiment has a hollow cylindrical shape concentrically formed around one central axis Ax (as an example in the drawings, A hollow cylindrical shape), and a pair of annular flange portions 4 disposed opposite to each other in a direction orthogonal to the central axis Ax, and the flange portions 4 extend between each other, and a predetermined distance ( For example, a plurality of pillars 6 provided at equal intervals) and a plurality of pockets 10 provided between the circumferential directions of the plurality of pillars 6 and capable of rotatably incorporating a plurality of rollers 8 one by one. And have.

  As the plurality of rollers 8, for example, elongated rollers having a small diameter and a length of 3 to 10 times the diameter can be applied, but the present invention is not limited to this. Each pocket 10 extends in parallel along the central axis Ax, and both side portions in the axial direction are formed so as to partially enter the flange portion 4. In this case, the pockets 10 are provided at predetermined intervals (for example, at equal intervals) along the circumferential direction, whereby the rollers 8 and the pockets 10 are alternately arranged one by one along the circumferential direction. Will be.

  Each pocket 10 has a circumferential pocket width d and an axial pocket length g according to the size (diameter dimension, length dimension) of the roller 8. In each pocket 10, the circumferential pocket width d can be defined as a value measured along the circumferential direction concentrically around the central axis Ax, and the axial pocket length g is defined as the central axis It can be defined as a value measured along a direction parallel to Ax.

  In addition, although the respective rectangular pockets 10 are shown as an example in the drawings, so-called “chamfering” is applied to the four corners of each pocket 10 in order to avoid (or reduce) stress concentration. It is preferable. In this case, various types of chamfering such as round chamfering and square chamfering can be applied. As an example, in FIG. 1A, chamfers R that are recessed (recessed) in an arc shape are applied to the four corners of each pocket 10, but if stress concentration can be avoided (or reduced), The kind of chamfering is not ask | required.

  The pair of flange portions 4 is formed with an outer diameter guide surface 4s that is continuous in the circumferential direction along the outer peripheral surface thereof. The outer diameter guide surface 4s is, for example, when each planetary gear rotates and revolves. The surface contacts (slids) against the raceway surface (not shown) of the mating member. In this case, by reducing the number of rollers 8, the pockets 10 are not required by the reduced number, and as a result, the width (area) of the outer diameter guide surface 4s can be expanded (increased).

  According to this, by reducing the number of rollers 8, it is possible to obtain a roller surface pressure (for example, 5 GPa or less) in accordance with the purpose of use or usage environment of the roller bearing retainer 2. Then, by expanding (increasing) the width (area) of the outer diameter guide surface 4s, the strength of the pair of flange portions 4 can be improved accordingly. As a result, it is possible to realize the roller bearing retainer 2 that has a required strength and a low torque.

  Moreover, each pillar part 6 is comprised in the circumferential direction both sides (both adjacent) of each above-mentioned pocket 10, and each pillar part 6 was each formed through the said pillar part 6 in radial direction, respectively. A dummy hole 12 is provided. In the drawing, as an example, a configuration in which a rectangular dummy hole 12 is provided in each column portion 6 is shown.

  In this case, each dummy hole 12 is preferably configured so that the circumferential dummy hole width a and the axial dummy hole length b satisfy the relationship “a <b”. In each dummy hole 12, the circumferential dummy hole width a can be defined as a value measured along the circumferential direction concentrically around the central axis Ax, and the axial dummy hole length b is , And can be defined as a value measured along a direction parallel to the central axis Ax.

  Further, with respect to the circumferential position around the central axis Ax of each dummy hole 12 in each column portion 6, each dummy hole 12 is positioned a predetermined distance c away from the pockets 10 on both sides (both adjacent) in the circumferential direction. . In other words, the dummy holes 12 and the pockets 10 on both sides (both sides) in the circumferential direction are positioned with a predetermined gap c interposed therebetween. Here, the distance (gap) c can be defined as the circumferential column width c of each column portion 6 that extends between each dummy hole 12 and each pocket 10.

  In this case, the circumferential column width c of the above-described portion in each column portion 6 is made smaller than the circumferential pocket width d of each pocket 10 described above, that is, the relationship “c <d” is satisfied. It is preferable to configure. Here, as a method of making the circumferential column width c smaller than the pocket width d (c <d), the circumferential dummy hole width a of each dummy hole 12 is set so as to satisfy the relationship “c <d”. Should be set.

  According to this, by providing the dummy hole 12 in each column part 6, each circumferential column width c on both sides (both sides) in the circumferential direction of each dummy hole 12 becomes thinned. The entire 6 can be made elastic. As a result, when each roller 8 is assembled in each pocket 10, each column portion 6 is elastically deformed, so that the incorporation of each roller 8 into each pocket 10 can be improved. Furthermore, by providing the dummy hole 12 in each column part 6, the roller bearing retainer 2 can be significantly reduced in weight.

  Further, by providing the dummy holes 12 in the respective column portions 6, the lubricant can be flowed through the dummy holes 12. For example, in a structure in which the lubricant flows from the bearing inner diameter to the bearing outer diameter, the lubricant can be efficiently and smoothly flowed through each dummy hole 12. Thereby, the lubrication performance at the time of bearing rotation can always be maintained constant.

  Further, for example, in a planetary mechanism (not shown) having a structure in which a plurality of planetary gears (not shown) revolve around a sun gear (not shown), the roller bearing cages 2 are respectively When incorporated in the planetary gear, by providing the dummy hole 12 in each pillar portion 6, the load due to the centrifugal force on the roller bearing retainer 2 can be greatly reduced.

  In this case, by greatly reducing the load caused by the centrifugal force on the roller bearing cage 2, when each planetary gear revolves while rotating, the outer diameter guide surface 4s of each flange portion 4 and the raceway surface of the mating member. Since the contact surface pressure (sliding surface pressure) generated with (not shown) can be reduced, the seizure resistance of the roller bearing cage 2 can be improved.

  In addition, by providing the dummy holes 12 in each column portion 6, for example, when forming the roller bearing retainer 2 by welding, it can be easily rounded in the process of rounding from a flat plate to form a hollow cylindrical shape, The roundness can be maintained and improved. Thereby, for example, in the roller bearing retainer 2 used in the planetary mechanism, it is possible to provide a more optimal bearing with respect to the bearing mounting dimension.

  Furthermore, with respect to the axial position along the central axis Ax of each dummy hole 12 in each column portion 6, each dummy hole 12 has a central portion with respect to the entire axial width (full length) of the roller bearing cage 2. Positioning is preferred. In addition, the axial direction full width (full length) of the roller bearing cage 2 can be defined as a value measured along a direction parallel to the central axis Ax.

  According to this, in addition to the effect obtained when the dummy holes 12 are provided in each of the column parts 6 described above, it is possible to further elastically deform the respective column parts 6 without deviation over the whole, and as a result. The degree of freedom of incorporation of each roller 8 with respect to each pocket 10 (for example, the degree of freedom in the direction of incorporation of each roller 8 into each pocket 10) can be improved.

  In this case, the axial dummy hole length b of each dummy hole 12 is configured to be smaller than the axial pocket length g of each pocket 10, that is, to satisfy the relationship “b <g”. It is preferable. As long as this relationship is satisfied, the axial dummy hole length b of each dummy hole 12 may be configured to be greater than the full axial width (full length) f of each column part 6 (b> f), or , It may be smaller than the full axial width (full length) f (b <f). The full axial width (full length) f can be defined as a value measured along a direction parallel to the central axis Ax.

  In addition, assuming a so-called M-shaped roller bearing retainer 2 having a shape in which the central portion of each column portion 6 is recessed (recessed) on the inner diameter side, the recess portion (recessed) of each column portion 6 is assumed. The axial dummy hole length b of each dummy hole 12 is larger than the full axial width e (b> e) with respect to the full axial width e of the inner diameter column part (reference numeral omitted) formed in the portion. Or may be smaller than the full axial width e (b <e). In the drawing, as an example, each dummy hole 12 configured to satisfy the relationship “b <e” is shown, but this does not limit the technical scope of the present invention. The full axial width e can be defined as a value measured along a direction parallel to the central axis Ax.

  Furthermore, the above-described pair of flange portions 4 is provided with a sub dummy hole 14 formed through a part of the outer peripheral surface within the range of the axial width on the outer peripheral surface continuous along the circumferential direction. Is preferred. As a specific example of the position where the sub dummy hole 14 is provided, in a planetary mechanism (not shown) having a structure in which a plurality of planetary gears (not shown) revolve around a sun gear (not shown). When the cage 2 is incorporated in each planetary gear, the outer peripheral surface of each flange portion 4 contacts the raceway surface (not shown) of the mating member when each planetary gear revolves while rotating. The outer diameter guide surface 4s (sliding) is formed, and the sub dummy hole 14 is formed so as to penetrate a part of the outer diameter guide surface 4s in the radial direction.

  According to this, in addition to the dummy hole 12, the sub-dummy hole 14 is provided in the outer diameter guide surface 4s, so that the weight of the roller bearing cage 2 can be further reduced, and the roller bearing cage. The load due to the centrifugal force on 2 can be further greatly reduced.

  Further, for example, in a structure in which the lubricant flows from the bearing inner diameter to the bearing outer diameter, the lubricant can be flowed through both the dummy holes 12 and the sub dummy holes 14, so that the lubricant can flow more efficiently and smoothly. be able to.

  Further, by providing the sub-dummy hole 14 in the outer diameter guide surface 4s, the contact surface pressure (sliding surface pressure) between the outer diameter guide surface 4s and the mating member (track surface) can be further drastically reduced. it can. In a use environment where the bearing does not revolve, the strength of each column portion 6 of the roller bearing retainer 2 is not required, and in this case, the sub dummy hole 14 can be formed relatively large.

  In this case, various shapes such as a circle, an ellipse, a triangle, and a rectangle can be applied as the shape of the sub dummy hole 14. As an example, FIG. 1B shows a circular sub-dummy hole 14, but the shape and size are not particularly limited as long as the above-described effect of the sub-dummy hole 14 can be realized.

  Further, as an example of the position where the sub dummy hole 14 is formed, FIG. 1B shows a configuration provided in both flange portions 4. However, the present invention is not limited to this. The flange portion 4 may be provided.

  In addition, as the formation positions of the sub dummy holes 14, a plurality of (or any one) flange portions 4 may be provided at predetermined intervals (for example, equal intervals) along the circumferential direction, or 1 One may be provided.

  The roller bearing cage 2 having the above-described configuration can be formed (manufactured) using a metal material such as a resin material or iron. In this case, as the resin material, for example, a polyamide resin (nylon 66, nylon 46) reinforced with glass fiber can be applied. Further, as the metal material, for example, when high strength is required, chromium molybdenum steel (SCM415) can be applied. Moreover, cold rolled steel (SPCC) and various carbon steel pipes for machine structures (STKM13, STKM1010) can be applied depending on the application and the cage manufacturing process.

The present invention is not limited to the configuration described above, and the following modifications are also included in the technical scope of the present invention.
As a first modified example, as shown in FIG. 2A, in each column portion 6 on both sides in the circumferential direction of each pocket 10, relief grooves 16 that are continuous (communicated) with the pocket 10 and extend in the axial direction are provided. It may be formed. In this case, each relief groove 16 may be formed by recessing (depressing) the portion between the pocket 10 and the dummy hole 12 in the radial direction or penetrating in the radial direction. According to this, the circumferential column widths c on both sides (both sides) in the circumferential direction of each pocket 10 (each dummy hole 12) are thinned, and the entire column portion 6 can be made elastic. In addition, it is possible to improve the incorporation of each roller 8 into each pocket 10. As the shape of the escape groove 16, it can be extended along the pocket 10 into various shapes such as a rectangular shape, an elliptical shape, and an arc shape. Further, the size of the escape groove 16 may be set according to the size of the portion between the pocket 10 and the dummy hole 12.

  As a second modified example, as shown in FIG. 2B, an elliptical dummy hole 12 may be used instead of the rectangular dummy hole 12 described above. In this case, each dummy hole 12 may be configured so that the short side is the circumferential dummy hole width a and the long side is the axial dummy hole length b, and the relationship “a <b” is satisfied.

  As shown in FIG. 2 (c) as a third modification, instead of the above-described M-shaped roller bearing retainer 2, the central portion of each column portion 6 is recessed (recessed), The roller bearing cage 2 having a solid inner peripheral side may be used.

  As a fourth modification, as shown in FIG. 2 (d), instead of the above-described M-shaped roller bearing retainer 2, a parallel and identical wall extending from each flange portion 4 to each column portion 6 is used. It is good also as the roller bearing retainer 2 comprised in thickness.

  Further, the roller bearing cage 2 of the present invention is not particularly illustrated, but can be applied as a cage needle bearing cage or a solid needle bearing cage, for example.

2 Roller bearing cage 4 Flange 6 Pillar 8 Roller 10 Pocket 12 Dummy hole

Claims (2)

A pair of annular flange portions having a hollow cylindrical shape concentrically formed around one central axis and arranged to face each other in a direction perpendicular to the central axis;
A plurality of pillar portions extending between the flange portions and provided at predetermined intervals along the circumferential direction;
The column part is composed of a large diameter part connected to the flange part, a small diameter part in the central part in the axial direction, and an inclined part connecting the large diameter part and the small diameter part,
A roller bearing retainer having a plurality of pockets provided between the circumferential directions of the plurality of column portions and capable of rotatably incorporating a plurality of rollers one by one,
Wherein the small diameter portion of the column sections, respectively, the dummy hole for flowing the lubricant from the shaft receiving the inner diameter passing through the column portion radially bearing outer diameter, a central and axial length of the pillar portion It is provided in parallel with the pocket at the center position in the circumferential width ,
In addition to the dummy holes, the large-diameter portion has a sub-dummy hole that is formed in a radial direction so as to be smaller than the dummy hole and allows the lubricant to flow from the bearing inner diameter to the bearing outer diameter. A roller bearing retainer provided with a phase . In each of the dummy holes, the circumferential dummy hole width is a, the axial dummy hole length is b,
In each of the column portions, the circumferential column width of the portion extending between each dummy hole and the pockets on both sides in the circumferential direction is c,
In each of the pockets, if the circumferential pocket width is d and the axial pocket length is g, each dummy hole is configured to satisfy the relationship of a <b and b <g, and the circumferential direction 2. The dummy hole width a is set so as to satisfy the relationship c <d, whereby the circumferential column width c is thinned to give elasticity to the entire column portion. The cage for roller bearings described.

Images