JP2008019935A - Rolling bearing and retainer for rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing and a retainer for the rolling bearing of low cost, high general-purpose properties, and excellent high speed rotation properties by improving the retainer. <P>SOLUTION: The retainer 5 comprises a synthetic resin retainer main body 21, and a ceramic reinforcement ring 22 integrated in a guide way surface side, namely an inner surface side of the main body 21 by insertion forming. Weight can be reduced by forming the retainer main body out of synthetic resin, and stiffness can be increased to make damage not easily occur by combining the same and the ceramic reinforcement ring 22. Also, the same can be manufactured at a low cost, seizure resistance and wear resistance can be improved by integration. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling bearing and a rolling bearing cage, and more particularly to a rolling bearing and a rolling bearing cage that have improved high-speed rotation performance.

Rolling bearings including outer ring, inner ring, a plurality of rolling elements arranged between both wheels, and a cage made of synthetic resin or high strength brass having a plurality of pockets for accommodating these rolling elements Is well known, but for use in high-speed machine tools, etc., it is an issue to improve its high-speed rotation, that is, seizure resistance and wear resistance at high-speed rotation. Yes. For example, in Patent Document 1, the rolling element holding part of the cage is made of a mixed sintered material of solid lubricant and metal, and reinforcing parts made of a metal material are formed at both ends of the rolling element holding part. Has been proposed.
JP 2002-227848 A

  The thing of the said patent document 1 presupposes using in a vacuum condition, and there exists a problem that it is difficult to divert and it is expensive for the general machine tool which uses lubricating oil, and it is cheap and versatile There is a need for rolling bearings and rolling bearing cages that are excellent in high-speed rotation performance.

  An object of the present invention is to provide a rolling bearing and a rolling bearing retainer that are inexpensive and versatile and excellent in high-speed rotation by improving the retainer.

  A rolling bearing according to the present invention is a rolling bearing including an outer ring, an inner ring, a plurality of rolling elements disposed between the two rings, and a cage that holds these rolling elements, and the cage is a synthetic resin cage. It consists of a main body and a ceramic reinforcing ring integrated on the guide surface side of the main body by insert molding.

  A cage for a rolling bearing according to the present invention is a cage for holding a plurality of rolling elements used in a rolling bearing having a plurality of rolling elements arranged between an outer ring, an inner ring, and both rings. It consists of a resin cage main body and a ceramic reinforcing ring integrated by insert molding on the guide surface side of the main body.

  The rolling bearing is preferably a cylindrical roller bearing or a deep groove ball bearing, but may be other bearings.

  The cage is composed of a pair of annular portions arranged at a predetermined interval in the axial direction, and a plurality of pillar portions that are provided at a predetermined interval in the circumferential direction and connect the two annular portions. In the case of the inner ring guide, a ceramic reinforcement ring is disposed on the inner diameter side of each annular portion, and in the case of the outer ring guide, a ceramic reinforcement ring is disposed on the outer diameter side of each annular portion. The synthetic resin cage main body includes a pair of annular portions arranged at predetermined intervals in the axial direction, and a plurality of column portions that are provided at predetermined intervals in the circumferential direction and connect the two annular portions. In the case of the inner ring guide, the inner diameter of the annular portion is larger than the inner diameter of the annular portion formed by the column portion. In the case of the outer ring guide, the outer diameter of the annular portion is the column portion. The diameter is smaller than the outer diameter of the formed annular portion. In the case of the inner ring guide, the inner diameter of the ceramic reinforcing ring is smaller than the inner diameter of the synthetic resin cage body = the inner diameter of the annular portion formed by the column so that the ceramic reinforcing ring always becomes the guide surface. In the case of the outer ring guide, it is preferable that the outer diameter of the ceramic reinforcing ring is larger than the outer diameter of the synthetic resin cage main body = the outer diameter of the annular portion formed by the column portion.

  The synthetic resin is, for example, PEEK, but is not limited to this. The ceramic is silicon nitride, silicon carbide, alumina, zirconia, or the like, but is not limited thereto.

  According to the rolling bearing and the rolling bearing cage of the present invention, the cage body can be reduced in weight by being made of synthetic resin, and by combining this with a ceramic reinforcing ring, rigidity is increased and breakage is caused. It becomes difficult to do. Moreover, it can be manufactured at low cost by integrating a ceramic reinforcing ring into the synthetic resin cage body by insert molding. And, because the ceramic reinforcing ring is located on the guide surface side, the sliding resistance on the guide surface side is reduced, and the seizure resistance and wear resistance are improved. High durability can be obtained.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a part of a first embodiment of a rolling bearing according to the present invention, and FIG. 2 shows the entire cage.

  The rolling bearing (1) is a cylindrical roller bearing, and includes a plurality of cylindrical rollers (4) arranged at predetermined intervals in the circumferential direction between the outer ring (2), the inner ring with collar (3), and both rings (2) (3). ), And a cage (5) for holding these cylindrical rollers (4).

  The cage (5) is cylindrical and has a pair of annular portions (11) arranged at a predetermined interval in the axial direction, and both annular portions (11) provided at a predetermined interval in the circumferential direction. ) To accommodate the cylindrical roller (4) by a pair of pillars (12) and a pair of pillars (12) and annular portions (11) on both sides thereof. Pocket (13) is formed. The cage (5) is an inner ring guide, and the distance between the inner diameter and the inner ring (3) is smaller than the distance between the outer diameter and the outer ring (2).

  The shape is the same as the conventional one, but the cage (5) of the first embodiment is different from the conventional one in that it comprises a synthetic resin cage body (21) and a ceramic reinforcing ring (22). It is different. That is, the cage (5) includes a cylindrical synthetic resin cage body (21) and a pair of cylindrical ceramics integrated by insert molding on the inner peripheral surface (that is, the guide surface side) of the body (21). The reinforcing ring (22) is made of a reinforcing ring (22), and the inner diameter of the reinforcing ring (22) is substantially equal to the inner diameter of a normal inner ring guide cage.

  The synthetic resin cage body (21) includes a pair of annular portions (21a) arranged at predetermined intervals in the axial direction, and both annular portions (21a) provided at predetermined intervals in the circumferential direction. ), And the inner diameter of the annular part (21a) is larger than the inner diameter of the annular part formed by the pillar part (21b). The ceramic reinforcing ring (22) has an outer diameter equal to the inner diameter of each annular portion (21a), and the inner diameter is slightly smaller than the inner diameter of the annular portion formed by the column portion (21b). Thus, it is arranged on the inner diameter side of each annular portion (21a).

  FIG. 3 shows a part of a second embodiment of the rolling bearing according to the present invention, and FIG. 4 shows the entire cage.

  The rolling bearing (1) is a cylindrical roller bearing, and includes a plurality of cylindrical rollers (4) arranged at predetermined intervals in the circumferential direction between the outer ring (2), the inner ring with collar (3), and both rings (2) (3). ), And a cage (6) for holding these cylindrical rollers (4).

  The cage (6) is cylindrical and has a pair of annular portions (31) arranged at predetermined intervals in the axial direction, and both annular portions (31) provided at predetermined intervals in the circumferential direction. ) To accommodate the cylindrical roller (4) by a pair of pillars (32) and a pair of pillars (32) and annular portions (31) on both sides thereof. Pocket (33) is formed. The cage (6) is an outer ring guide, and the distance between the outer diameter and the outer ring (2) is smaller than the distance between the inner diameter and the inner ring (3).

  Although the above shape is the same as the conventional one, the cage (6) of the second embodiment is different from the conventional one in that it comprises a synthetic resin cage body (41) and a ceramic reinforcing ring (42). It is different. That is, the cage (6) is made of a pair of cylindrical ceramics integrated with a cylindrical synthetic resin cage body (41) and an outer peripheral surface (that is, the guide surface side) of the body (41) by insert molding. The outer diameter of the reinforcing ring (42) is substantially equal to the outer diameter of a normal outer ring guide cage.

  The synthetic resin cage body (41) includes a pair of annular portions (41a) arranged at predetermined intervals in the axial direction, and both annular portions (41a) provided at predetermined intervals in the circumferential direction. ), And the outer diameter of the annular part (41a) is smaller than the outer diameter of the annular part formed by the pillar part (41b). The ceramic reinforcing ring (42) has an inner diameter equal to the outer diameter of the annular portion (41a), and the outer diameter is slightly larger than the outer diameter of the annular shape formed by the column portion (41b). And arranged on the outer diameter side of each annular portion (41a).

  Although not shown, at least one recess or groove is formed on the non-guide surface side of the ceramic reinforcing ring (22) (42), that is, the surface in contact with the cage body (21) (41), and the insert The synthetic resin fits into the recess or groove at the time of molding so that the main body (21) (41) and the ring (22) (42) are prevented from coming off.

  Further, the rolling bearing (1) illustrated above is a cylindrical roller bearing in which the collar is provided on the inner ring, while the cages (5) and (6) are those in which the collar is provided on the outer ring. It can also be used with other cylindrical roller bearings. The deep groove type ball bearing is similar to the cylindrical roller bearing in that it has a cylindrical cage, and the deep groove type ball bearing is similar to the above cages (5) and (6). A configuration can be applied.

FIG. 1 is a longitudinal sectional view (axial sectional view) of a cage pocket portion showing a first embodiment of a rolling bearing according to the present invention. FIG. 2 is a perspective view showing a first embodiment of a rolling bearing retainer according to the present invention. FIG. 3 is a longitudinal section (axial section) view of a cage pocket portion showing a second embodiment of a rolling bearing according to the present invention. FIG. 4 is a perspective view showing a second embodiment of the rolling bearing retainer according to the present invention.

Explanation of symbols

(1) Rolling bearing
(2) Outer ring
(3) Inner ring
(4) Cylindrical roller
(5) Inner ring guide cage
(6) Outer ring guide cage
(21) (41) Synthetic resin cage body
(22) (42) Ceramic reinforcement ring

Claims (2)

In a rolling bearing provided with an outer ring, an inner ring, a plurality of rolling elements arranged between both wheels, and a cage for holding these rolling elements,
The cage comprises a synthetic resin cage body and a ceramic reinforcing ring integrated by insert molding on the guide surface side of the body. A cage for holding a plurality of rolling elements used in a rolling bearing having a plurality of rolling elements disposed between an outer ring, an inner ring and both wheels,
A rolling bearing cage comprising a synthetic resin cage body and a ceramic reinforcing ring integrated by insert molding on the guide surface side of the body.

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