JP2014119032A - Holder for conical roller bearing, and conical roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holder for a conical roller bearing and a conical roller bearing, capable of stabilizing rotation of the holder by preventing a contact between a large diameter-side end face portion of a conical roller and a large diameter-side annular portion of the holder during rotation of the bearing.SOLUTION: The conical roller bearing includes a large diameter-side annular portion 15, a small diameter-side annular portion 16 disposed coaxially with the large diameter-side annular portion 15, a plurality of pillar portions 17 disposed at nearly equal intervals in the circumferential direction so as to connect the large diameter-side annular portion 15 with the small diameter-side annular portion 16, and pocket portions 18 formed between the pillar portions 17 adjacent to each other in the circumferential direction, and rollably retaining a conical roller 13. A plurality of fin portions 20 are radially disposed at nearly equal intervals in the circumferential direction on an axial outer end face 16a of the small diameter-side annular portion 16.

Description

  The present invention relates to a tapered roller bearing retainer and a tapered roller bearing.

  Tapered roller bearings are compact, can support large radial loads and axial loads, and can be used at high speeds, so that they can be used in general industrial machines such as railway vehicles, steel machines, machine tools, construction machines, etc. It is widely used as a rotating support for automobile transmissions.

  By the way, in a tapered roller bearing, the tapered roller may move in the axial direction when rotating at a high speed. In this case, if the end surface of the tapered roller contacts the cage, there is friction between the end surface of the tapered roller and the cage. As a result, the rotational torque may increase and the cage may be worn. In particular, when the large-diameter end surface portion of the tapered roller comes into contact with the large-diameter side annular portion of the cage, the moment around the center of gravity of the cage is increased, and the cage is likely to vibrate or tilt in the axial direction. For this reason, when the cage rotates during bearing rotation, the behavior of the cage becomes unstable, causing noise and vibration.

  Therefore, in the tapered roller bearing, the cage surface is provided so that the circumferential surface portion of the small flange portion formed at the small-diameter side end portion of the inner ring serves as a cage guide surface that guides the cage in the circumferential direction of the inner ring and the outer ring. In order to reduce the noise and vibration by suppressing the swinging of the motor is known (for example, see Patent Document 1).

JP 2009-04-1651 A

  However, in the tapered roller bearing described in Patent Document 1, the axial movement of the cage cannot be sufficiently restricted, and the large-diameter side end surface portion of the tapered roller and the large-diameter side annular portion of the cage are Cannot be avoided. As a result, axial vibration and tilt are generated in the cage, and there is room for improvement in terms of stabilizing the behavior of the cage during bearing rotation.

  The present invention has been made in view of the above circumstances, and its purpose is to prevent contact between the large diameter side end surface portion of the tapered roller and the large diameter side annular portion of the cage during bearing rotation, It is an object of the present invention to provide a tapered roller bearing cage and a tapered roller bearing capable of stabilizing the rotation of the cage.

The above object of the present invention can be achieved by the following constitution.
(1) In order to connect the large-diameter side annular portion, the small-diameter-side annular portion coaxially arranged with the large-diameter-side annular portion, and the large-diameter-side annular portion and the small-diameter-side annular portion in the circumferential direction A tapered roller bearing retainer having a plurality of column portions arranged at substantially equal intervals and a pocket portion formed between the column portions adjacent to each other in the circumferential direction to hold the tapered rollers in a rollable manner. A tapered roller bearing retainer characterized in that a plurality of fin portions are radially provided at substantially equal intervals in the circumferential direction on the axially outer end surface of the small-diameter side annular portion.
(2) The tapered roller bearing retainer according to (1), wherein the plurality of fin portions are respectively provided at a predetermined inclination angle with respect to the rotation direction of the tapered roller bearing retainer.
(3) A guide for guiding an air flow including a lubricant generated by the plurality of fins when the cage rotates to the axially outer side of the small diameter side annular portion on the small diameter side annular portion. The tapered roller bearing retainer according to (1) or (2), further comprising a portion.
(4) An outer ring having an outer ring raceway surface on the inner peripheral surface, an inner ring having an inner ring raceway surface on the outer peripheral surface, and a plurality of tapered rollers arranged to be rollable between the outer ring raceway surface and the inner ring raceway surface; A tapered roller bearing comprising: a retainer that retains the tapered rollers at equal intervals in the circumferential direction, wherein the retainer is a retainer for a tapered roller bearing according to any one of (1) to (3) Tapered roller bearings characterized by being.

  According to the tapered roller bearing cage or tapered roller bearing of the present invention, a plurality of fin portions are radially arranged at substantially equal intervals in the circumferential direction on the outer circumferential surface of the small diameter side annular portion of the tapered roller bearing cage. Accordingly, when the cage is rotated, air containing the lubricant can be flowed outward in the axial direction on the small-diameter side annular portion side by the plurality of fin portions. As a result, a propulsive force is generated in the cage toward the large-diameter side annular portion due to the reaction to the air flow containing the lubricant, so that the large-diameter side end surface portion of the tapered roller and the large-diameter side annular portion of the cage Can be prevented. For this reason, since it can prevent that a vibration and inclination of an axial direction arise in a cage, rotation of a cage can be stabilized.

It is principal part sectional drawing explaining 1st Embodiment of the retainer for tapered roller bearings and tapered roller bearing which concern on this invention. It is a perspective view of the retainer for tapered roller bearings shown in FIG. It is a principal part enlarged view of the retainer for tapered roller bearings shown in FIG. It is a perspective view explaining 2nd Embodiment of the tapered roller bearing retainer which concerns on this invention. It is principal part sectional drawing of the retainer for tapered roller bearings shown in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a tapered roller bearing retainer and a tapered roller bearing according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
First, a first embodiment of a tapered roller bearing retainer and a tapered roller bearing according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the tapered roller bearing 10 of this embodiment 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 outer peripheral surface, an outer ring raceway surface 11a and an inner ring. A plurality of tapered rollers 13 disposed so as to be able to roll between the raceway surface 12a and a tapered roller bearing retainer 14 (hereinafter simply referred to as a “retainer”) that retains the tapered rollers 13 at equal intervals in the circumferential direction. Also). In addition, a small flange portion 12b and a large flange portion 12c are formed at the axial end portion of the inner ring 12, respectively. The bearing space between the outer ring raceway surface 11 a of the outer ring 11 and the inner ring raceway surface 12 a of the inner ring 12 is filled with lubricating oil (lubricant).

  The tapered roller bearing retainer 14 is formed by injection molding of synthetic resin, and is coaxially disposed with the large diameter side annular portion 15 and the large diameter side annular portion 15 as shown in FIGS. 1 and 2. In order to connect the small diameter side annular part 16, the large diameter side annular part 15 and the small diameter side annular part 16, and a plurality of column parts 17 arranged at substantially equal intervals in the circumferential direction; A pocket portion 18 is formed between the column portions 17 adjacent to each other and holds the tapered roller 13 so as to be able to roll.

  And in this embodiment, as shown in FIG.2 and FIG.3, the several fin part 20 is radially arranged in the circumferential direction at the substantially equal intervals on the axial direction outer end surface 16a of the small diameter side annular part 16 of the holder | retainer 14. As shown in FIG. Is provided. The plurality of fin portions 20 are formed simultaneously with the injection molding of the cage 14.

  The plurality of fin portions 20 are provided at a predetermined inclination angle with respect to the rotation direction of the retainer 14 (arrow A direction), and more specifically, outward in the axial direction toward the counter-rotation direction of the retainer 14. Inclined so as to face. As a result, as shown in FIG. 3, when the retainer 14 rotates, the air containing the lubricating oil is pushed out by the plurality of fin portions 20 toward the outer side in the axial direction on the small-diameter side annular portion 16 side. Flow (see arrow B). For this reason, a propulsive force (see arrow C) is generated in the cage 14 toward the large-diameter annular portion 15 due to the reaction to the flow of air containing the lubricating oil.

  Moreover, the fin part 20 is formed in the substantially S shape. Thereby, the flow of the air containing the lubricating oil generated by the plurality of fin portions 20 can be smoothed, and the propulsive force acting on the cage 14 can be stabilized.

  As described above, according to the tapered roller bearing 10 of the present embodiment, the plurality of fin portions 20 are radially arranged at substantially equal intervals in the circumferential direction on the axially outer end surface 16a of the small diameter side annular portion 16 of the cage 14. Therefore, when the cage is rotated, air including lubricating oil can be flowed outward in the axial direction on the small diameter side annular portion 16 side by the plurality of fin portions 20. As a result, a propulsive force is generated in the cage 14 toward the large-diameter annular portion 15 due to the reaction to the air flow containing the lubricating oil, so that the large-diameter end surface portion of the tapered roller 13 and the large diameter of the cage 14 are generated. Contact with the side annular portion 15 can be prevented. For this reason, since it can prevent that the vibration and inclination of an axial direction arise in the holder | retainer 14, rotation of the holder | retainer 14 can be stabilized.

  On the other hand, the possibility that the small-diameter side end surface portion of the tapered roller 13 and the small-diameter-side annular portion 16 of the retainer 14 are in contact with each other increases. In this case, the retainer is compared with the contact on the large-diameter side. Since the moment generated in 14 is small, the cage 14 does not have a large inclination, and the cage 14 rotates stably and the generation of noise and vibration is suppressed. Furthermore, since the several fin part 20 functions as a reinforcement rib, the rigidity of the holder | retainer 14 can be improved.

  Further, according to the tapered roller bearing 10 of the present embodiment, since the plurality of fin portions 20 are respectively provided at a predetermined inclination angle with respect to the rotation direction of the cage 14, air containing lubricating oil by the plurality of fin portions 20. Can flow efficiently toward the outside in the axial direction on the small-diameter-side annular portion 16 side.

  Further, according to the tapered roller bearing 10 of the present embodiment, the contact between the large diameter side end surface portion of the tapered roller 13 and the large diameter side annular portion 15 of the cage 14 can be prevented. The large-diameter side annular portion 15 can be thinned without reducing the strength. Thereby, the increase in material cost by providing the several fin part 20 can be suppressed.

(Second Embodiment)
Next, a second embodiment of the tapered roller bearing retainer and the tapered roller bearing according to the present invention will be described with reference to FIGS. 4 and 5. Note that portions that are the same as or equivalent to those of the first embodiment are denoted by the same or equivalent reference numerals in the drawings, and description thereof is omitted or simplified.

  In the present embodiment, as shown in FIGS. 4 and 5, a plurality of fin portions 30 are arranged on the outer circumferential surface 16 a of the small-diameter side annular portion 16 of the retainer 14 instead of the plurality of fin portions 20. It is provided radially at substantially equal intervals in the direction. The fin portion 30 is formed at a right angle to the axial outer end surface 16a.

  Furthermore, a cylindrical guide portion 31 that protrudes outward in the axial direction is provided at the radially outer end edge of the small-diameter side annular portion 16. In addition, a tapered surface 31 a is formed on the inner peripheral surface of the guide portion 31 so as to be smoothly continuous from the axial outer end surface 16 a of the small-diameter side annular portion 16 and extend outward in the axial direction and radially outward. Further, the plurality of fin portions 30 and the guide portions 31 are integrally joined, and are formed at the same time when the cage 14 is injection molded.

  And in the holder | retainer 14 comprised in this way, as for the space between the adjacent fin parts 30 and 30, the outer diameter side is closed by the guide part 31, and the groove-shaped space by which the inner diameter side and the axial direction outer side were open | released. It is composed. For this reason, when the cage 14 rotates, the plurality of fin portions 30 and the guide portions 31 function as a sirocco fan, and air containing lubricating oil flows from the inner diameter side to the outer diameter side of the small diameter side annular portion 16. And flows outward in the axial direction (see arrow D). For this reason, a propulsive force (see arrow E) is generated in the retainer 14 toward the large-diameter annular portion 15 due to the reaction to the flow of air containing the lubricating oil. In the present embodiment, the direction of rotation of the cage 14 is not limited, and if the cage 14 rotates, a similar air flow containing lubricating oil is generated.

  As described above, according to the tapered roller bearing 10 of the present embodiment, the plurality of fin portions 30 are radially arranged at substantially equal intervals in the circumferential direction on the axially outer end surface 16a of the small diameter side annular portion 16 of the cage 14. In addition, a cylindrical guide portion 31 that protrudes outward in the axial direction is provided at the radially outer end edge of the small-diameter side annular portion 16, so that the plurality of fin portions 30 and guides are rotated during the cage rotation. The air containing lubricating oil can be made to flow outward in the axial direction on the small-diameter side annular portion 16 side by the portion 31. As a result, a propulsive force is generated in the cage 14 toward the large-diameter annular portion 15 due to the reaction to the air flow containing the lubricating oil, so that the large-diameter end surface portion of the tapered roller 13 and the large diameter of the cage 14 are generated. Contact with the side annular portion 15 can be prevented. For this reason, since it can prevent that the vibration and inclination of an axial direction arise in the holder | retainer 14, rotation of the holder | retainer 14 can be stabilized.

Further, according to the tapered roller bearing 10 of the present embodiment, the guide portion 31 is smoothly continuous with the inner peripheral surface from the axial outer end surface 16a of the small-diameter side annular portion 16, and is axially outward and radially outward. Since the taper surface 31a extending in the direction is formed, the flow of air including the lubricating oil generated by the plurality of fin portions 30 and the guide portion 31 can be smoothed, and the propulsive force acting on the cage 14 can be stabilized. .
About another structure and an effect, it is the same as that of the said 1st Embodiment.

  In addition, this invention is not limited to what was illustrated by said each embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

DESCRIPTION OF SYMBOLS 10 Tapered roller bearing 11 Outer ring 11a Outer ring raceway surface 12 Inner ring 12a Inner ring raceway surface 13 Tapered roller 14 Tapered roller bearing cage 15 Large-diameter side annular part 16 Small-diameter side annular part 16a Axial outer end face 17 Column part 18 Pocket part 20 Fin part 30 Fin part 31 Guide part 31a Tapered surface

Claims (4)

In order to connect the large diameter side annular part, the small diameter side annular part coaxially arranged with the large diameter side annular part, and the large diameter side annular part and the small diameter side annular part in the circumferential direction. A tapered roller bearing retainer having a plurality of column portions arranged at substantially equal intervals and a pocket portion formed between the column portions adjacent to each other in the circumferential direction so as to hold the tapered rollers in a rollable manner. There,
A tapered roller bearing retainer characterized in that a plurality of fin portions are provided radially at substantially equal intervals in the circumferential direction on the axially outer end surface of the small-diameter side annular portion.   2. The tapered roller bearing retainer according to claim 1, wherein the plurality of fin portions are respectively provided at a predetermined inclination angle with respect to a rotation direction of the tapered roller bearing retainer.   A guide for guiding the flow of air containing the lubricant generated by the plurality of fins during rotation of the cage outward in the axial direction of the small-diameter side annular part on the axially outer end surface of the small-diameter side annular part. The tapered roller bearing retainer according to claim 1 or 2, further comprising a portion. An outer ring having an outer ring raceway surface on an inner peripheral surface, an inner ring having an inner ring raceway surface on an outer peripheral surface, and a plurality of tapered rollers arranged to be rollable between the outer ring raceway surface and the inner ring raceway surface; A tapered roller bearing comprising: a retainer that holds the tapered rollers at equal intervals in the circumferential direction;
A tapered roller bearing, wherein the cage is the tapered roller bearing cage according to any one of claims 1 to 3.

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