JP3210225U - Angular contact ball bearing cage, angular contact ball bearing and bearing device - Google Patents

Abstract

An angular ball bearing retainer, an angular ball bearing, and a bearing device that can increase the load capacity of an axial load and suppress the occurrence of abnormal vibration and abnormal noise. In an angular ball bearing retainer and an angular ball bearing, first and second annular portions (31, 32) are formed in steps so that at least one of an inner diameter and an outer diameter is different from each other. The outer peripheral surface and inner peripheral surface of the part 33 are provided with inclined surfaces 33a and 33b. Further, when the outer diameter of the first annular portion 31 is φD1, the inner diameter is φd1, the outer diameter of the second annular portion 32 is φD2, the inner diameter is φd2, and the pitch circle diameter of the balls is φdm, φD1> φdm> φd2 And φD2> φdm> φd1. Further, the pocket 34 is constituted by a cylindrical surface whose central axis is perpendicular to the rotational axis X of the angular ball bearing 1. [Selection] Figure 1

Description

  The present invention relates to a cage for angular ball bearings, an angular ball bearing, and a bearing device.

Angular ball bearings are employed on the spindles of machine tools, particularly on spindles that apply a large axial load.
In addition, machine tools such as NC lathes, milling machines, machining centers, multi-task machines, five-axis machines, direct-feeding mechanisms for beds that mount spindle heads and workpieces such as electric injection molding machines and punching press machines, Ball screws that convert rotational motion into linear motion are used. An angular ball bearing is also used as a bearing that rotatably supports the shaft end of the ball screw (for example, see Patent Document 1).

  FIG. 7 shows an angular ball bearing 100 used as a bearing for applying a large axial load, and a cage 110 used for the angular ball bearing 100. In this angular ball bearing 100, the groove shoulders 101 a and 102 a on one side in the axial direction of the outer ring 101 and the other side in the axial direction of the inner ring 102 are increased, and the contact angle of the ball 103 is increased to thereby increase the axial direction of the bearing. The load capacity of the load can be increased. In addition, the retainer 110 has a pair of annular portions 111 and 112 arranged in steps to avoid interference with the groove shoulders 101a and 102a of the outer ring 101 and the inner ring 102, and the pair of annular portions 111 and 112 are straight. The columnar portions 113 are connected to each other. The cage 110 is an outer ring guide system, and the amount of movement of the cage 110 in the radial direction is defined by a gap with the inner peripheral surface of the outer ring 101.

JP 2000-104742 A

  By the way, in the cage 110 shown in FIG. 7, the pocket 114 is greatly inclined in the cross section, and when the pocket 114 and the ball 103 come into contact, an oblique reaction force acts on the cage 110. For this reason, the retainer 110 tends to tilt, the retainer 110 vibrates abnormally, and abnormal noise such as retainer noise is likely to occur. Further, when the vibration increases, there is a possibility of progressing to pocket wear.

  The present invention has been made in view of the above circumstances, and it is possible to increase the load capacity of an axial load and to suppress the occurrence of abnormal vibration and abnormal noise, an angular ball bearing cage, an angular ball bearing, and An object is to provide a bearing device.

The above object of the present invention is achieved by the following configuration.
(1) First and second annular portions provided at intervals in the axial direction, and a plurality of column portions disposed at intervals in the circumferential direction between the first and second annular portions. An angular ball bearing retainer having a plurality of pockets respectively defined by the column portions adjacent to each other in the circumferential direction and the first and second annular portions and holding a plurality of balls, respectively. ,
The first and second annular portions are formed in steps, with at least one of an inner diameter and an outer diameter being different from each other,
At least one of the outer peripheral surface and the inner peripheral surface of the column part includes an inclined surface,
When the outer diameter of the first annular portion is φD1, the inner diameter is φd1, the outer diameter of the second annular portion is φD2, the inner diameter is φd2, and the pitch circle diameter of the balls is φdm,
φD1>φdm> φd2 and φD2>φdm>φd1;
The cage for an angular ball bearing, wherein the pocket is formed by a cylindrical surface whose central axis is perpendicular to the rotational axis of the angular ball bearing.
(2) The angular ball bearing retainer according to (1), wherein φD1> φD2 and φd1> φd2.
(3) The angular ball bearing retainer according to (1) or (2), wherein the cage is an inner ring guide or an outer ring guide.
(4) The angular ball bearing retainer according to (1) or (2), wherein the cage is a ball guide.
(5) 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;
A plurality of balls arranged to freely roll with a contact angle between the outer ring raceway surface and the inner ring raceway surface;
(1) to the angular ball bearing retainer according to any one of (4),
Angular contact ball bearings characterized by having.
(6) A bearing device combining the angular ball bearing according to (5) and a cylindrical roller bearing,
A bearing device having a diameter clearance of 20 μm or more is formed between the outer peripheral surface of the outer ring of the angular ball bearing and the inner peripheral surface of the housing.

According to the angular ball bearing retainer and the angular ball bearing of the present invention, the first and second annular portions are formed in a stepped manner so that at least one of the inner diameter and the outer diameter is different from each other. At least one of the inner peripheral surface includes an inclined surface. Further, when the outer diameter of the first annular part is φD1, the inner diameter is φd1, the outer diameter of the second annular part is φD2, the inner diameter is φd2, and the pitch circle diameter of the balls is φdm, and φD1>φdm> φd2, and , ΦD2>φdm> φd1. Furthermore, the pocket is constituted by a cylindrical surface whose central axis is perpendicular to the rotational axis of the angular ball bearing. Thereby, while being able to improve the load capability of an axial load, the angular ball bearing retainer and the angular ball bearing which can suppress generation | occurrence | production of abnormal vibration and abnormal noise can be obtained.

  Furthermore, according to the bearing device of the present invention, the angular ball bearing described above and the cylindrical roller bearing are combined, and a diameter of 20 μm or more is provided between the outer peripheral surface of the outer ring of the angular ball bearing and the inner peripheral surface of the housing. Since the clearance is formed, the radial load and the axial load can be shared by the cylindrical roller bearing and the angular ball bearing 1.

(A) is sectional drawing of the angular ball bearing which concerns on 1st Embodiment of this invention, (b) is sectional drawing of the cage for angular ball bearings. It is sectional drawing of the angular ball bearing which concerns on 2nd Embodiment of this invention. It is sectional drawing of the angular ball bearing which concerns on 3rd Embodiment of this invention. It is sectional drawing of the angular ball bearing which concerns on the modification of this invention. It is sectional drawing with which the angular ball bearing which concerns on 1st Embodiment was combined with the back surface. It is sectional drawing which shows the example in which the angular ball bearing combined with the back surface of FIG. 5 was applied to the cutter side bearing of the machine tool spindle. (A) is sectional drawing of the conventional angular ball bearing, (b) is sectional drawing of the cage for angular ball bearings.

  Hereinafter, an angular ball bearing concerning an embodiment of the present invention is explained using a drawing.

(First embodiment)
As shown in FIG. 1, the angular ball bearing 1 of the present embodiment includes an outer ring 10 having an outer ring raceway surface 11 on an inner peripheral surface, an inner ring 20 having an inner ring raceway surface 21 on an outer peripheral surface, an outer ring raceway surface 11 and an inner ring. A plurality of balls 3 arranged between the raceway surfaces 21 and a retainer 30 that holds the balls 3 in a freely rolling manner and is an outer ring guide system.

  An outer ring groove shoulder 12 is formed on the inner circumferential surface of the outer ring 10 on one side in the axial direction with respect to the outer ring raceway surface 11 (the rear side, the left side in FIG. 1). An outer ring counterbore 13 is formed on the side (front side, right side in FIG. 1).

  An inner ring counterbore 23 is formed on the outer peripheral surface of the inner ring 20 on the one axial side (back side, left side in FIG. 1) with respect to the inner ring raceway surface 21, and the other axial side (front side) with respect to the inner ring raceway surface 21. The inner ring groove shoulder 22 is formed on the side (right side in FIG. 1).

The contact angle α is set to about 40 ° ≦ α ≦ 60 °. In the present embodiment, the axial width of the outer ring 10 is designed to be shorter than the axial width of the inner ring 20.

Next, the configuration of the cage 30 will be described in detail. The material of the cage 30 may be a metal material or a synthetic resin material.
As the metal material, copper alloy, iron, aluminum, magnesium and the like are employed. Moreover, in the case of an iron-type material, silver plating etc. may be given.
As the synthetic resin material, polyamide, polyacetal, polyether ether ketone, polyimide, polyphenylene sulfide, or the like is employed. Moreover, reinforcing materials, such as glass fiber, carbon fiber, and aramid fiber, may be added as needed.

As shown in FIG. 1 (b), the cage 30 includes first and second annular portions 31, 32 provided at intervals in the axial direction, and the first and second annular portions 31, 32. A plurality of pillar portions 33 arranged at intervals in the circumferential direction between the pillar portions 33 and the first and second annular portions 31 and 32 adjacent to each other in the circumferential direction. A plurality of pockets 34 for holding the plurality of balls 3 are provided.
Such an angular ball bearing retainer 30 having the first and second annular portions 31 and 32 can increase the strength of the retainer compared to a conventional crown retainer.

The first and second annular portions 31 and 32 are provided on the radially outer side of the second annular portion 32 so that the first and second annular portions 31 and 32 do not interfere with the outer ring groove shoulder 12 and the inner ring groove shoulder 22. , Arranged in steps. Therefore, in this embodiment, both the inner and outer diameters of the first and second annular portions 31 and 32 are different from each other, and the outer peripheral surface and the inner peripheral surface of the column portion 33 are provided with inclined surfaces 33a and 33b, respectively. And formed in a different way. That is, if the outer diameter of the first annular portion 31 is φD1, the inner diameter is φd1, the outer diameter of the second annular portion 32 is φD2, and the inner diameter is φd2, then φD1> φD2 and φd1> φd2, and the outer ring groove The thickness of the first and second annular portions 31 and 32 can be increased while avoiding interference with the shoulder portion 12 and the inner ring groove shoulder portion 22.
In the present embodiment, the inner and outer peripheral surfaces of the first and second annular portions 31 and 32 are formed by cylindrical surfaces having a uniform diameter.

The pocket 34 has a cylindrical surface whose central axis is perpendicular to the rotational axis X of the angular ball bearing. Further, when the pitch circle diameter of the balls 3 is φdm, φD1>φdm> φd2 and φD2 >Φdm> φd1 is set.
When the above requirements are not satisfied, the contact point between the pocket 34 and the ball 3 is disengaged from the maximum diameter portion (equator) of the ball 3 when the cage 30 moves in the axial direction of the bearing. Depending on the amount of movement of the cage 30 in the radial direction, the contact point of the pocket surface changes, and the amount of movement is not fixed. As a result, the cage 30 may vibrate abnormally or abnormal noise (such as cage noise) may be generated. Moreover, when vibration is large, there is a possibility of progressing to pocket wear.
On the other hand, by setting so as to satisfy the above requirements, the movement of the cage 30 is restricted, and the occurrence of abnormal vibration and abnormal noise can be suppressed.

As described above, in the angular ball bearing retainer 30 and the angular ball bearing 1 of the present embodiment, the first and second annular portions 31 and 32 are different from each other in at least one of an inner diameter and an outer diameter. The outer circumferential surface and the inner circumferential surface of the column portion 33 are provided with inclined surfaces 33a and 33b. The outer diameter of the first annular portion 31 is φD1, the inner diameter is φd1, and the outer diameter of the second annular portion 32 is φ.
When D2, the inner diameter is φd2, and the pitch pitch diameter of the balls is φdm, φD1>φdm> φd2 and φD2>φdm> φd1. Further, the pocket 34 is constituted by a cylindrical surface whose central axis is perpendicular to the rotational axis X of the angular ball bearing 1. Thereby, while being able to improve the load capability of an axial load, the angular ball bearing retainer and the angular ball bearing which can suppress generation | occurrence | production of abnormal vibration and abnormal noise can be obtained.

  Further, by setting φD1> φD2 and φd1> φd2, the first and second annular portions 31, 32 are avoided while avoiding interference with the outer ring groove shoulder 12 and the inner ring groove shoulder 22 of the outer inner rings 10, 20. The thickness of the cage can be increased, and the rigidity of the cage can be increased.

(Second Embodiment)
FIG. 2 shows an angular ball bearing 1 according to a second embodiment of the present invention. Note that the same or equivalent parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

In the present embodiment, the inner diameters of the first and second annular portions 31, 32 are designed to be equal (φd1 = φd2), while the outer diameters of the first and second annular portions 31, 32 are different from each other ( φD1> φD2), and the outer peripheral surface of the column portion 33 includes an inclined surface 33a.
However, also in this embodiment, φD1>φdm> φd2 and φD2>φdm> φd1 are satisfied, and the pocket 34 has a central axis perpendicular to the rotational axis X of the angular ball bearing 1. It is comprised by the cylindrical surface and there exists an effect similar to 1st Embodiment.
Other configurations and operations are the same as those in the first embodiment.

(Third embodiment)
FIG. 3 shows an angular ball bearing 1 according to a third embodiment of the present invention. Note that the same or equivalent parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

In this embodiment, the outer diameters of the first and second annular portions 31, 32 are designed to be equal (φD1 = φD2), while the inner diameters of the first and second annular portions 31, 32 are different from each other ( φd1> φd2), and the inner peripheral surface of the pillar portion 33 includes an inclined surface 33b.
However, also in this embodiment, φD1>φdm> φd2 and φD2>φdm> φd1 are satisfied, and the pocket 34 has a central axis perpendicular to the rotational axis X of the angular ball bearing 1. It is comprised by the cylindrical surface and there exists an effect similar to 1st Embodiment.
Other configurations and operations are the same as those in the first embodiment.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, the angular ball bearing cage of the present invention is not limited to the outer ring guide system of the present embodiment, and may be an inner ring guide system or a ball guide system.

  In addition, as seen in the first to third embodiments, if the first and second annular portions 31 and 32 of the present invention are formed in a step difference because at least one of the inner diameter and the outer diameter is different from each other. In addition, it is sufficient that at least one of the outer peripheral surface and the inner peripheral surface of the column portion 33 includes an inclined surface.

  Furthermore, in 1st-3rd embodiment, although the axial direction width | variety of the outer ring | wheel 10 is designed short with respect to the axial direction width | variety of the inner ring | wheel 20, this invention is not limited to this, For example, deformation | transformation of FIG. As shown in the example, the axial widths of the outer ring 10 and the inner ring 20 may be set equal.

  Moreover, the angular ball bearing of the said embodiment can be used in combination. For example, as shown in FIG. 5, the angular ball bearing 1 of the first embodiment can be used in combination with the back surface.

FIG. 6 is a cross-sectional view showing an example in which the back-combined angular ball bearing 1 of FIG. 5 is applied to a blade-side bearing of a machine tool main shaft 40 which is a bearing device.
For example, as a spindle arrangement optimal for the spindle 40 that applies a large axial load during cutting, such as a boring machine or a lathe, as a blade-side bearing of the spindle 40, a double-row cylinder is provided between the rotary shaft 60 and the housing 70 A roller bearing 50 and an angular ball bearing 1 combined on the back are arranged in combination.

In this case, a diameter gap g of 20 μm or more is formed between the outer peripheral surface of the outer ring 10 of the angular ball bearing 1 and the inner peripheral surface of the housing 70. If the diameter clearance g is less than 20 μm, the spindle 40 may bend due to cutting load or the like, the outer ring 10 and the housing 70 may come into contact, and the angular ball bearing 1 may apply a radial load. For this reason, the diameter clearance g is set to 20 μm or more.
The diameter clearance is desirably about 20 μm to 500 μm.

Thereby, the radial load is loaded by the double row cylindrical roller bearing 50, and the axial load is loaded by the angular ball bearing 1. If both the radial load and the axial load are received by the angular ball bearing 1, the life of the angular ball bearing 1 is reduced, and the life of the double-row cylindrical roller bearing 50 is significantly longer than that of the angular ball bearing 1. End up. On the other hand, as in this example, the radial load is applied by the double-row cylindrical roller bearing 50, and the axial load is applied by the angular ball bearing 1, so that the load is balanced in both the bearings 1 and 50. Bearing life can be realized.
The double-row cylindrical roller bearing 50 of this example may be a single-row cylindrical roller bearing.

DESCRIPTION OF SYMBOLS 1 Angular contact ball bearing 3 Ball 10 Outer ring 12 Outer ring groove shoulder 13 Outer ring counter bore 20 Inner ring 22 Inner ring groove shoulder 23 Inner ring counter bore 30 Cage 31 First annular part 32 Second annular part 33 Column part 34 Pocket 40 Machine tool Main spindle for machinery (bearing device)
φD1 outer diameter of the first annular portion φd1 inner diameter of the first annular portion φD2 outer diameter of the second annular portion φd2 inner diameter of the second annular portion φdm pitch circle diameter α of the ball contact angle

Claims (6)

A first and a second annular part provided at intervals in the axial direction; and a plurality of pillars arranged at intervals in the circumferential direction between the first and second annular parts, An angular ball bearing retainer having a plurality of pockets respectively defined by the column portions adjacent to each other in the circumferential direction and the first and second annular portions, each holding a plurality of balls,
The first and second annular portions are formed in steps, with at least one of an inner diameter and an outer diameter being different from each other,
At least one of the outer peripheral surface and the inner peripheral surface of the column part includes an inclined surface,
When the outer diameter of the first annular part is φD1, the inner diameter is φd1, the outer diameter of the second annular part is φD2, the inner diameter is φd2, and the pitch circle diameter of the balls is φdm,
φD1>φdm> φd2 and φD2>φdm>φd1;
The cage for an angular ball bearing, wherein the pocket has a cylindrical surface whose central axis is perpendicular to the rotational axis of the angular ball bearing.   The angular ball bearing retainer according to claim 1, wherein φD1> φD2 and φd1> φd2.   The angular ball bearing retainer according to claim 1 or 2, wherein the cage is an inner ring guide or an outer ring guide.   The angular ball bearing retainer according to claim 1, wherein the angular ball bearing retainer is a ball guide. An outer ring having an outer ring raceway surface on the inner circumferential surface;
An inner ring having an inner ring raceway surface on the outer peripheral surface;
A plurality of balls arranged to freely roll with a contact angle between the outer ring raceway surface and the inner ring raceway surface;
An angular ball bearing cage according to any one of claims 1 to 4,
Angular contact ball bearings characterized by having. A bearing device combining the angular ball bearing according to claim 5 and a cylindrical roller bearing,
A bearing device having a diameter clearance of 20 μm or more is formed between the outer peripheral surface of the outer ring of the angular ball bearing and the inner peripheral surface of the housing.

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