JP2006342901A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing capable of preventing seizure even if it is a rolling bearing for high-speed rotation and improving the bearing life.
SOLUTION: 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, and an outer ring raceway surface 11a and an inner ring raceway surface 12a are rotatably interposed. A rolling bearing 10 including a plurality of rolling elements 13 and a cage 14 that holds the rolling elements 13 at equal intervals in the circumferential direction, and a metal punched cage is used for the cage 14, A concave portion 19 is provided on the inner peripheral surface 18 of the pocket portion 17 of the cage 14.
[Selection] Figure 2

Description

  The present invention relates to a rolling bearing provided with a cage, and more particularly to a rolling bearing suitable for high-speed rotation.

  Conventionally, as a cage used for a rolling bearing, for example, a corrugated punching cage shown in FIG. 3 is known.

  The cage 1 is assembled by crimping a pair of cage members 2 obtained by punching a non-heat-treated product such as cold rolled steel into a corrugated shape with a rivet 3 or the like for cost reduction and productivity. The cage 1 has an inner peripheral surface of the pocket portion 5 by forming an oil film with a lubricating oil between the inner peripheral surface 5 a of the pocket portion 5 and the rolling member 4 in the pocket portion 5 that holds the rolling member 4. Wear of the sliding part between 5a and the rolling element 4 is suppressed.

  In addition, as a conventional rolling bearing, a rolling bearing (for example, refer to Patent Document 1) in which a space between an outer ring and an inner ring is filled with a lubricant-containing polymer, a cage is made of an inorganic binder, and tungsten disulfide is used. There is known a rolling bearing (see, for example, Patent Document 2) that forms a film formed by adding s.

JP-A-6-313435 Japanese Patent Laid-Open No. 10-205541

  However, when these conventional rolling bearings are applied to rolling bearings for high-speed rotation that have a dmN value (product of bearing PCDdm and rotational speed N) that is often used in automobiles or the like, the lubricating oil in the pocket portion Due to the stirring resistance and the retention of lubricating oil, a rapid temperature rise may occur, and seizure or the like may occur on the raceway surface or the rolling element.

  In addition, when the oil film between the inner peripheral surface of the pocket portion and the rolling element breaks due to the high-speed rotation of the bearing, the inner peripheral surface and the rolling element slide in direct metal contact. Wear of the sliding part is promoted, which causes a decrease in bearing life.

  The present invention has been made to eliminate such inconveniences, and its purpose is to prevent seizure even when the rolling bearing is used for high-speed rotation, and to improve the bearing life. It is in providing the rolling bearing which can be performed.

The above object of the present invention can be achieved by the following constitution.
(1) 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 rolling elements interposed between the outer ring raceway surface and the inner ring raceway surface so as to be freely rollable. A rolling bearing comprising a cage for holding the rolling elements at equal intervals in the circumferential direction, wherein a metal punched cage is used for the cage, and a recess is provided in the pocket portion of the cage. Rolling bearing.
(2) The rolling bearing according to (1), wherein the cage is subjected to a low friction coating on at least the inner peripheral surface of the pocket portion.

  According to the present invention, the metal punched cage is used for the cage, and the recess is provided in the pocket portion of the cage, so that the lubricating oil is actively supplied and discharged through the recess. The fluidity of the lubricating oil can be improved. Moreover, since the surface area of a cage | basket increases, the heat dissipation of a cage | basket can be improved. Thereby, since the temperature rise and friction inside a bearing can be suppressed, even if it is a rolling bearing for high-speed rotation applications, seizure can be prevented and the bearing life can be improved.

  Further, according to the present invention, since the cage performs a low friction coating on at least the inner peripheral surface of the pocket portion, even if it is a rolling bearing for high-speed rotation applications, the inner peripheral surface of the pocket portion and the rolling elements It is possible to suppress wear associated with direct metal contact. As a result, damage to the cage and damage to the rolling elements due to friction powder can be prevented, so that the bearing life can be improved.

Hereinafter, an embodiment of a rolling bearing according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view for explaining a rolling bearing according to the present invention, and FIG. 2 is an enlarged sectional view of a main part for explaining a cage incorporated in the rolling bearing shown in FIG.

  As shown in FIG. 1, the rolling bearing 10 of the present embodiment is a deep groove ball bearing, and 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, A plurality of rolling elements 13 interposed between the outer ring raceway surface 11a and the inner ring raceway surface 12a so as to be freely rollable, and a cage 14 for holding the rolling elements 13 at substantially equal intervals in the circumferential direction. ing.

  As shown in FIG. 2, the cage 14 is assembled by crimping a pair of cage members 15, 15 obtained by punching a non-heat-treated product such as cold rolled steel into a corrugated shape from the viewpoint of cost reduction and productivity. Corrugated punching cage made of steel plate. In the pocket portion 17 that holds the rolling element 13, the retainer 14 forms an oil film with a lubricating oil between the inner peripheral surface 18 of the pocket portion 17 and the rolling element 13, whereby the inner peripheral surface 18 and the rolling element are formed. The wear of the sliding part with 13 is suppressed.

  And in this embodiment, the recessed part 19 which supplies and discharges lubricating oil actively is formed in the internal peripheral surface 18 of the pocket part 17 of the holder | retainer 14 by press molding etc., for example.

  The concave portion 19 is formed in two locations on the inner peripheral surface 18 of the pocket portion 17 so as to be opposed to each other in the axial direction with respect to one pocket portion 17, and referring to FIG. 1, the outer ring 11, the cage 14, Are connected to the bearing space side between the inner ring 12 and the bearing space side between the inner ring 12 and the cage 14 to form a groove-shaped lubricating oil path.

  Further, the inner peripheral surface 18 of the pocket portion 17 or the entire surface of the cage 14 is subjected to a low friction coating treatment such as a manganese phosphate coating. In this embodiment, the cage 14 is provided with the manganese phosphate salt coating, but the present invention is not limited to this, and a zinc phosphate coating, a molybdenum disulfide coating, or the like may be applied.

  Therefore, according to the rolling bearing 10 of the present embodiment, a corrugated punching cage made of a steel plate is used as the retainer 14 and the lubricating oil is positively supplied and discharged to the inner peripheral surface 18 of the pocket portion 17 of the retainer 14. Since the concave portion 19 that performs oil is provided, the lubricating oil is actively supplied and discharged through the concave portion 19, so that the fluidity of the lubricating oil in the bearing 10 can be improved. Moreover, since the surface area of the holder | retainer 14 increases, the heat dissipation of the holder | retainer 14 can be improved. Thereby, since the temperature rise and friction inside the bearing 10 can be suppressed, even if it is a rolling bearing for high-speed rotation applications, seizure can be prevented and the bearing life can be improved.

  Further, according to the rolling bearing 10 of the present embodiment, the cage 14 performs a low friction coating process such as a manganese phosphate coating on the inner peripheral surface 18 of the pocket portion 17 or the entire surface of the cage 14, so that the high speed Even if it is a rolling bearing for rotation applications, wear due to direct metal contact between the inner peripheral surface 18 of the pocket portion 17 and the rolling element 13 can be suppressed. Thereby, damage to the cage 14 and damage to the rolling element 13 due to friction powder can be prevented, so that the bearing life can be improved.

  Furthermore, according to the rolling bearing 10 of the present embodiment, a corrugated punching cage made of a highly productive steel plate is basically used for the cage 14, so that conventional bearing specifications and cage specifications are significantly changed. In addition, a rolling bearing for high-speed rotation that has an effect of preventing seizure and an effect of suppressing wear can be obtained, so that the cost reduction of the rolling bearing can be achieved.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, in the present embodiment, the shape of the concave portion 19 provided on the inner peripheral surface 18 of the pocket portion 17 is a rectangular shape. However, the shape is not limited to this, and other shapes such as a circle can be used as the lubricating oil path. If there is, it may be applied to the present invention.
Further, the number of the concave portions 19 and the installation position can be changed depending on the use conditions and the manufacturing process, and are not particularly limited.
The outer ring, inner ring, outer ring raceway surface, inner ring raceway surface, rolling element, cage, pocket portion, recess, low friction coating treatment, etc. of the present invention are not limited to those exemplified in the above-described embodiment. The present invention can be changed as appropriate without departing from the scope of the present invention.

  Below, the rotation test done in order to confirm the effect of the rolling bearing 10 (invention example) of this invention is demonstrated.

  The present invention used in this test is a standard-designed deep groove ball bearing 6011 (φ55 mm × φ90 mm × 18 mm, ball diameter φ10.32 mm, PCD 72.5 mm). The entire surface of the vessel is coated with a manganese phosphate salt coating (see FIG. 2).

  In this test, the present invention example and the comparative example are prepared one by one, and the state of each hour is observed. Further, a conventional deep groove ball bearing 6011 is used for a comparative example which is a comparison target of the present invention example (see FIG. 3). The results are shown in Table 1.

The test conditions are as follows.
Rotational speed: 10000 min ⁻¹ (dmN value: 725,000)
Axial load: 1500N
Lubricating oil: ATF for automobiles
Lubrication method: Forced lubrication: 0.01 L / min

  As is clear from Table 1, in the conventional example, sliding traces were confirmed on the inner peripheral surface of the pocket portion in 1 h, abnormal vibration was generated before 15 h, and seizure was confirmed. On the other hand, in the example of the present invention, no abnormality was confirmed at 1 h, and there was no other problem with only a slight sliding mark even after 15 hours. Thereby, it turned out that the example of the present invention has an excellent anti-seizure effect and wear suppression effect.

It is sectional drawing in order to demonstrate the rolling bearing which concerns on this invention. It is a principal part expanded sectional view for demonstrating the holder | retainer integrated in the rolling bearing shown in FIG. It is a principal part expanded sectional view for demonstrating the holder | retainer integrated in the conventional rolling bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rolling bearing 11 Outer ring 11a Outer ring raceway surface 12 Inner ring 12a Inner ring raceway surface 13 Rolling element 14 Steel corrugated punching cage 16 Rivet 17 Pocket part 18 Inner peripheral surface 19 Concave part

Claims (2)

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 rolling elements interposed between the outer ring raceway surface and the inner ring raceway surface in a freely rollable manner; A rolling bearing comprising a cage for holding the rolling elements at equal intervals in the circumferential direction,
Use a metal punched cage for the cage,
A rolling bearing, wherein a recess is provided in a pocket portion of the cage.   The rolling bearing according to claim 1, wherein the retainer performs a low friction coating process on at least an inner peripheral surface of the pocket portion.

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