JP5082869B2 - Rolling bearing device - Google Patents

Description

  The present invention relates to a rolling bearing device. More specifically, the present invention relates to a rolling bearing device that is sealed in grease storage space and lubricated with grease that is naturally replenished to the bearing space by rotation of a shaft.

  When grease is used as a lubricant in rolling bearings used for high-speed rotating shafts such as spindles of machine tools, the amount of grease enclosed in the bearing space at the initial stage of operation is set to be smaller than that of general rolling bearings. Yes. Specifically, in order to suppress the heat generation of grease due to agitation resistance and the temperature rise of the bearing due to it, for example, the bearing space volume (excluding the total volume of rolling elements and cage from the volume of the annular space between the inner and outer rings) The volume is set to about 10 to 15%. For this reason, in order to prolong the lubrication life of the bearing, it is necessary to replenish grease that is insufficient due to outflow.

Therefore, in order to naturally replenish the lubricant and improve the lubrication life of the bearing, for example, a rolling bearing device shown in FIG. 3 has been proposed (see Patent Document 1).
In Patent Document 1, each row of inner rings 102, a shared outer ring 103, an inner ring spacer 104 provided between the inner rings 102, and a cage 106 are held between the inner and outer rings. An inner ring rotation type double-row angular contact ball bearing 101 composed of rolling elements 105 is described. In this rolling bearing device 101, a lubricant reservoir space 115 is provided in the inner ring spacer 104, and grease is applied from the contact surface 117, which is a butt surface between the inner ring spacer 104 and the inner ring 102, by centrifugal force accompanying rotation of the shaft. Naturally supplied to the raceway surface.

Japanese Utility Model Publication No. 4-133024 (FIG. 4)

However, in the rolling bearing device 101 described in Patent Document 1, since the contact surface 117 is used as the lubricant outflow path, the entire grease sealed in the lubricant reservoir space 115 is not supplied to the raceway surface. In this grease, the base oil separated from the thickener is mainly supplied. Since this base oil has low viscosity and high fluidity, it flows out of the bearing relatively easily. For this reason, in the rolling bearing device 101, the effect of improving the lubrication life of the bearing is not sufficient.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a rolling bearing device capable of improving the lubrication life of the bearing by continuously supplying the grease itself into the bearing. It is said.

The rolling bearing device of the present invention has an inner ring raceway surface on the outer periphery, an inner ring that is a rotating side race ring,
An outer ring having an outer ring raceway surface on the inner periphery and being a fixed side raceway;
A plurality of rolling elements rolling between the inner ring raceway surface and the outer ring raceway surface;
An inner ring spacer having a grease storage space on an end face that is in contact with one end face in the axial direction of the inner ring and is in contact with the inner ring;
A rolling bearing provided with a grease supply path for supplying grease in the grease storage space to an outer peripheral surface of the inner ring or the inner ring spacer through a contact portion between an end surface of the inner ring spacer and an end surface of the inner ring A device,
The grease supply path is composed of a spiral groove formed on one of the end surface of the inner ring spacer and the end surface of the inner ring, and the spiral groove is a rotation direction of the inner ring. And an angle having a circumferential direction component on the outer diameter surface of the inner ring spacer or the inner ring, and extending outward in the radial direction with a circumferential component from the outer diameter surface of the grease storage space. Open to the bearing space , and
The grease supply path is the other of the groove surface of the spiral groove, the end surface of the inner ring spacer, and the end surface of the inner ring, except for the opening to the grease storage space and the opening to the bearing space. It is characterized in that it is closed with the end face .

  In the rolling bearing device of the present invention, a spiral groove is formed as a grease supply path connecting the grease storage space and the inner ring spacer or the outer peripheral surface of the inner ring, and this groove is opposite to the rotation direction of the inner ring. The shape is going outward. In addition, the spiral groove extends radially outward from the outer diameter surface of the grease storage space with a circumferential component and into the bearing space at an angle having a circumferential component on the outer ring surface of the inner ring spacer or inner ring. Open. Then, by applying centrifugal force to the grease in the grease storage space by the rotation of the inner ring and the inner ring spacer, the grease in the grease storage space can be easily guided to this spiral groove, The grease can be continuously supplied into the bearing without interruption. As a result, the grease itself can be continuously supplied to the inside of the bearing, and the supplied grease is held inside the bearing by the action of the thickener contained therein, thereby improving the lubrication life of the bearing. be able to.

  According to the rolling bearing device of the present invention, the grease itself can be continuously supplied into the bearing, thereby improving the lubrication life of the bearing.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a rolling bearing device of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic sectional view of a rolling bearing device 1 according to an embodiment of the present invention. The rolling bearing device 1 is an inner ring 2 that is a rotating side race ring into which a shaft (not shown) is fitted, and a fixed side race ring that is disposed concentrically with the inner ring 2 on the radially outer side of the inner ring 2. An angular ball bearing having an outer ring 3, a plurality of balls 4 as rolling elements arranged therebetween, a cage 5 that holds the plurality of balls 4, and an inner ring spacer 6 are configured. It is a rolling bearing device.

An inner ring raceway surface 2 a is formed on the outer circumferential surface of the inner ring 2, and an outer ring raceway surface 3 a facing the inner ring raceway surface 2 a is formed on the inner circumferential surface of the outer ring 3.
The balls 4 held at predetermined intervals in the circumferential direction by the pockets 5a of the cage 5 roll between the inner ring raceway surface 2a and the outer ring raceway surface 3a.
The inner ring spacer 6 is disposed in contact with one end surface 2 c in the axial direction of the inner ring 2. A cylindrical grease storage space 7 is formed on the end surface 6 a of the inner ring spacer 6 that contacts the end surface 2 c of the inner ring 2, and grease is sealed in the grease storage space 7. As the grease 9 filled in the grease storage space 7, a general grease in which a thickener is dispersed in a lubricating oil serving as a base oil can be used.

The rolling bearing device 1 allows the grease enclosed in the grease storage space 7 to pass through the abutting portion between the end surface 6a of the inner ring spacer 6 and the end surface 2a of the inner ring 2 and the outer circumference of the inner ring 2 or the inner ring spacer 6. It has a spiral groove 8 which is a grease supply path for supplying the surface.
FIG. 2 is an explanatory view taken along the line AA in FIG. 1 showing the spiral groove 8. In FIG. 2, the radial dimension (difference between the outer diameter and the inner diameter) of the end face 6a is exaggerated for easy understanding. The spiral groove 8 is an end surface 6 a of the inner ring spacer 6 and is formed in an annular portion on the radially outer side of the grease storage space 7. The groove 8 has one end connected to the grease storage space 7 and the other end connected to the bearing space 20 between the outer ring 3 and the inner ring 2. The other end of the groove 8 opens in a range overlapping with the cage 5 in the radial direction.
The groove 8 has a shape that goes outward in the direction opposite to the rotation direction R of the inner ring 2, that is, a shape that gradually increases in diameter in the clockwise direction in FIG. 2. Further, the groove 8 extends radially outward from the outer diameter surface 7a of the grease storage space 7 with a circumferential component, and the bearing space 20 has an angle having a circumferential component on the outer diameter surface 6b of the inner ring spacer 6. Is open. The cross section of the groove 8 in the present embodiment is semicircular (see FIG. 1), and its width w is set to about 0.5 to 1.0 mm in consideration of the fluidity of grease. In this specification, “having a circumferential component” means that one end of the spiral groove 8 (the end on the grease storage space 7 side) is radially outward from the outer diameter surface 7a of the grease storage space 7. That is, it is intended to exclude extending in a direction orthogonal to the tangent to the outer diameter surface 7 a, and “at an angle having a circumferential component” means that the other end of the spiral groove 8 is connected to the inner ring spacer 6. It is intended to exclude opening to the bearing space 20 radially outward from the outer diameter surface 6b, that is, in a direction perpendicular to the tangent to the outer diameter surface 6b. In other words, as shown in FIG. 2, the center line O of the groove 8 and the outer diameter surface 7a or the outer diameter surface 6b intersect at an acute intersection angle α.

The grease 9 stored in the grease storage space 7 passes through the spiral groove 8 which is a grease supply path from the grease storage space 7 when the inner ring 2 and the inner ring spacer 6 rotate, and each of the inner ring spacer 6 and the inner ring 2. It is supplied to the outer peripheral surfaces 6b and 2b. More specifically, a centrifugal force is applied to the grease 9 stored in the grease storage space 7 by the rotation of the inner ring 2 and the inner ring spacer 6. In the present embodiment, however, the spiral groove 8 is provided. However, since it has a shape that faces outward in the direction opposite to the rotation direction R of the inner ring 2, it tries to move it outward (to the bearing space) with respect to the grease in the spiral groove 8 The component force to act acts. Therefore, the grease can be naturally supplied to the bearing space 20 by the rotation of the inner ring 2.
In the present embodiment, since the groove is used as the grease supply path that connects the grease storage space 7 and the bearing space 20, the grease itself that has higher viscosity and lower fluidity than the base oil is supplied to the bearing space 20. be able to.
In this embodiment, the spiral groove 8 extends from the outer diameter surface 7a of the grease storage space 7 at an angle having a circumferential component, so that the grease sealed in the grease storage space 7 is smooth. It is possible to move to the spiral groove 8 without interruption. Furthermore, since the spiral groove 8 is opened to the bearing space 20 at an angle having a circumferential component, it can be smoothly moved to the bearing space 20 without interruption.
Since the grease supplied to the bearing space 20 is held in the bearing space 20 for a long time by the action of the thickener contained therein, the lubrication life of the rolling bearing device 1 can be improved.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the present invention. For example, in the embodiment, the spiral groove 8 is formed on the end surface 6 a of the inner ring spacer 6, but it may be formed on one end surface 2 c in the axial direction of the inner ring 2. Further, the cross-sectional shape of the groove 8 may be a square shape or a V-groove shape in addition to the semicircular shape.

It is a schematic sectional drawing which shows the rolling bearing apparatus which concerns on one embodiment of this invention. It is AA arrow explanatory drawing of FIG. 1 which shows the spiral groove | channel 8. FIG. It is a schematic sectional drawing which shows the conventional rolling bearing apparatus.

Explanation of symbols

1 Rolling bearing device 2 Inner ring (rotating raceway)
3 Outer ring (fixed side ring)
4 balls (rolling elements)
5 Cage 6 Inner ring spacer 7 Grease storage space 8 Spiral groove (grease supply path)
9 Grease

Claims (1)

An inner ring having an inner ring raceway surface on the outer periphery and being a rotating side race ring;
An outer ring having an outer ring raceway surface on the inner periphery and being a fixed side raceway;
A plurality of rolling elements rolling between the inner ring raceway surface and the outer ring raceway surface;
An inner ring spacer having a grease storage space on an end face that is in contact with one end face in the axial direction of the inner ring and is in contact with the inner ring;
A rolling bearing provided with a grease supply path for supplying grease in the grease storage space to an outer peripheral surface of the inner ring or the inner ring spacer through a contact portion between an end surface of the inner ring spacer and an end surface of the inner ring A device,
The grease supply path is composed of a spiral groove formed on one of the end surface of the inner ring spacer and the end surface of the inner ring, and the spiral groove is a rotation direction of the inner ring. And an angle having a circumferential direction component on the outer diameter surface of the inner ring spacer or the inner ring, and extending outward in the radial direction with a circumferential component from the outer diameter surface of the grease storage space. Open to the bearing space , and
The grease supply path is the other of the groove surface of the spiral groove, the end surface of the inner ring spacer, and the end surface of the inner ring, except for the opening to the grease storage space and the opening to the bearing space. The rolling bearing device is characterized in that it is closed with an end face .

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