JP2003278765A - Angular ball bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide seal-equipped angular ball bearings 1 and 1 that are mated on their backs and fronts, needs only the small number of part items for its high compatibility, and has a large load capacity. <P>SOLUTION: The angular ball bearing has: an outer ring 2 with angular outer raceways 8, a counterbore 9 in one of the outer raceways, and a shoulder part 10 in the other of the outer raceways, the shoulder part being thicker than the counterbore; an inner ring 4 having a deep-groove type inner raceway 12 on its outer peripheral surface 11; a plurality of balls 3; and a cage 5. Seal grooves 13 and 14 in which seals 6 can be fitted are provided on both sides of the outer raceway and in symmetry with respect to a center face 20. A clearance part 15 preventing interference between the seals and the shoulder part is provided on the inside diameter side of the seal groove 13 located on the shoulder side, and sliding contact surfaces 17 against which the inner peripheral parts 16 of the seals is slidable are provided on both sides of the inner raceway. The cage 5 retains the plurality of balls 3 from one side and prevents the other side from protruding beyond the balls. The seals are attached to only the seal groove on the other side of the cage. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of angular ball bearings each having a single-row deep groove type inner ring raceway and an angular type outer ring raceway arranged to support a radial and thrust load and an angular contact ball bearing with a seal. Bearing improvements.

It is known that angular ball bearings are designed to support radial and thrust loads, and the raceways on which balls, which are rolling elements, roll are arranged in multiple rows or in multiple rows. As a single row, small-sized, angular ball bearing with a seal in which the balls are relatively large compared to the sizes of the inner and outer rings, for example, in JP-A-9-21425, the outer ring is an angular type and the inner ring is a deep groove type. A single row angular contact ball bearing having a seal on the counterbore side is disclosed. As shown in FIG. 4, the outer ring 32 has an angular outer ring raceway 8 on the inner peripheral surface thereof, a counterbore 9 on one side of the outer ring raceway, and a shoulder portion 10 thicker than the counterbore on the other side of the outer ring raceway. Is provided. Further, the inner ring 34 is provided with a deep groove type inner ring raceway 12 on the outer peripheral surface 11 and a plurality of balls 3 are rollably provided between the inner ring 34 and the outer ring raceway 8 as in the general deep groove type ball bearing. A seal groove 44 is provided on the end surface of the counterbore 9, and an outer peripheral portion 36c of a substantially disc-shaped seal 36 is fitted therein.
The inner peripheral portion 36d of the seal is sealed with the sliding contact surface 37 provided on the outer peripheral surface 11 of the inner ring with a minute gap. Seal the two angular ball bearings 31 and 31 concerned
The spacer 6 is arranged with the side 6 on the outside.

On the other hand, as an angular contact (deep groove type) ball bearing with seal using a raceway for both inner and outer rings, for example, in Japanese Utility Model Laid-Open No. 6-56519, the outer and inner rings are deep groove type and a seal is provided at one end. Have been disclosed. As shown in FIG. 5, the outer and inner rings 52, 53 are deep groove type used in general radial bearings, and a plurality of balls roll on the inner and outer ring raceways 12, 58. . The outer peripheral portion 56c of the substantially disk-shaped seal is fitted into one of the seal grooves 54 in which the seal 56 can be fitted symmetrically with respect to the center plane including the center of the ball 3 on both sides of the outer raceway 58, and the inner circumference of the seal is fitted. The portion 56d is configured to be in sliding contact with the sliding contact surface 57 provided on the outer peripheral surface 11 of the inner ring. A retainer 5 that holds the plurality of balls 3 from one side and does not protrude from the balls is provided on the other side. The two angular ball bearings are back-to-back with the sealing side facing outward.

[0004]

In such a single-row angular contact ball bearing, when arranging a plurality of angular ball bearings, the shoulders 10 side shown in FIG. There is a front-to-front alignment to be arranged in the above manner, and further three or four and a plurality of them are appropriately combined and arranged. However, since the outer ring angular type shown in FIG. 4 has the shoulder portion 10, it has a left-right asymmetry as seen in the figure, and there is a problem in that it is possible to make a back face adjustment but not a front face alignment. On the other hand, the one shown in FIG. 5 is bilaterally symmetric, and there is no problem on the front side and the back side, but there is a problem that the load capacity is insufficient because it is a deep groove type without shoulders.

In view of the above problems, an object of the present invention is to provide an angular contact ball bearing having an outer ring of an angular type and an inner ring of a deep groove type, which can be back-faced and front-faced, and has a small number of parts and high compatibility. It is to provide an angular contact ball bearing with a large load capacity and an angular contact ball bearing with a seal.

[0006]

According to the present invention, an angular outer ring raceway is formed on the inner peripheral surface, a counterbore is formed on one side of the outer ring raceway, and a shoulder portion is thicker than the counterbore on the other side of the outer ring raceway. And an outer ring having an outer ring, an inner ring having a deep groove type inner ring raceway on the outer peripheral surface, a plurality of balls rolling between the outer ring raceway and the inner ring raceway, and a cage for holding the plurality of balls. In ball bearings,
On both sides of the outer ring raceway, there is a seal groove in which a seal can be fitted symmetrically with respect to the center plane including the centers of the plurality of balls, and the seal groove is provided on the inner diameter side of the seal groove on the shoulder side. A seal that is fitted when fitted and has a relief portion that does not interfere with the shoulder portion, and seals that are fitted in the seal groove symmetrically with respect to the center plane on both sides of the inner ring raceway. Provided is an angular contact ball bearing, the inner peripheral portion of which has a slidable contact surface so that the retainer holds the plurality of balls from one side and does not protrude from the balls on the other side. By doing so, the above problems have been solved (Claim 1).

Further, it is preferable that the seal is attached only to the seal groove provided in the outer ring on the other side of the cage (claim 2).

That is, sliding contact surfaces are provided on both sides of the inner ring raceway so that the inner peripheral portion of the seal is slidable, and seal grooves are provided on both sides of the outer ring raceway symmetrically with respect to the center plane including the centers of a plurality of balls.
Provide a relief on the inner diameter side of the seal groove on the shoulder side. As a result, the seal can be fitted into either the seal bore on the counterbore side or the seal groove on the shoulder side, so that the seal can be arranged on the outside either in the back surface or the front surface. The same seal may be used. Further, in three or more rows, the one without the seal may be appropriately arranged. Further, since the retainer holds a plurality of balls from one side and does not project to the other side from the balls, the balls can be made larger and the load capacity and bearing rigidity can be increased.
In addition, the cage is fitted to the seal position so as not to interfere with the seal. Further, since it is symmetrical with respect to the center plane, it has high compatibility and facilitates the design for incorporation into the device.

The symmetrical arrangement of the seal grooves is described in the above-mentioned Japanese Utility Model Publication No. 6-56519 shown in FIG. However, since this one does not distinguish between the rear and front arrangements, it is not necessary to distinguish and use the inner seal groove, and the use and effect of increasing flexibility of the rear and front arrangements as in the present invention are suggested. Neither has it been disclosed. Further, there is no suggestion or disclosure of providing a relief portion in the shoulder portion and intentionally making the seal groove symmetrical.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of the present invention will be described with reference to the drawings. In each of the drawings, FIG. 1 is an upper half sectional view showing a state in which two single-row sealed angular contact ball bearings showing an example of an embodiment of the present invention are combined in a back surface, and FIG.
Is an upper half sectional view showing a front combined state, and FIG. 3 is an upper half sectional view showing a multi-row combined state. 1 or 2, the angular contact ball bearing with a seal 1 of the present invention,
1 ′ is composed of an outer ring 2, balls 3, an inner ring 4, a cage 5 and a seal 6. On the left side of FIG. 1, the outer ring 2
Is an angular outer ring raceway 8 on the inner circumferential surface 7, a counterbore 9 on one side (left side in the figure) of the outer ring raceway, and a shoulder 1 thicker than the counterbore on the other side (right side in the figure) of the outer ring raceway.
0 is provided. The angular type outer ring raceway 8 resists an external force from the left in the figure, and the shoulder portion 10 is provided to form the outer ring raceway 8. The counter bore 9 has a thin wall so that the ball 3 can be assembled or disassembled from the left side when entering or disassembling. The ball 3 is held by a cage 5 so as not to fall out of the counterbore 9. The inner ring 4 is provided with a deep groove type inner ring raceway 12 on the outer peripheral surface 11 so that a plurality of balls 3 roll between the inner raceway 4 and the outer ring raceway 8 described above.

In the present invention, the center plane 20 including the centers of the plurality of balls 3 on both sides of the outer ring raceway 8 is symmetrically sealed 6
Are provided with seal grooves 13 and 14 to which can be fitted. Further, on the inner diameter side of the seal groove 13 on the shoulder portion 10 side, as shown in FIG.
As shown in FIG. 3, a relief portion 15 is provided so that the fitted seal 6 and the shoulder portion 10 do not interfere with each other when the seal 6 is fitted in the seal groove 13. As shown by the sealed angular contact ball bearings on the right side of FIGS. 1 and 2, the seal 6 has a U-shaped cross section, and the relief portion 15 has an inner end 13 of the seal groove 13.
It is on the same plane as a. Sliding contact surfaces 17 are provided on both sides of the inner ring raceway 12 so that the inner peripheral portion 16 of the seal 6 fitted in the seal grooves 13 and 14 symmetrically with respect to the center surface 20 is slidable. The seal 6 has a donut plane shape, and a resin 6b is coated on a donut plane core metal 6a whose outer and inner circumferences are bent in the axial direction. The outer peripheral portion 6c of the resin portion 6b of the seal 6 is elastically fitted into the seal grooves 13 and 14. The inner peripheral portion 16 is provided with a seal lip 16a and a dust lip 16b, and the seal lip has an inner ring sliding contact surface 17
The sliding contact portion is sealed by sliding. The dust lip 16b can prevent dust from the outside and can form a grease reservoir or the like between the seal lip 16a and the dust lip in some cases. The cage 5 holds a plurality of balls 3 from one side and does not project from the balls to the other side, and is an asymmetric cage. For example, it is the same as that described in Japanese Utility Model Laid-Open No. 6-56519 described above, and the ball 3 is held in the opening pocket 5c provided in the protruding portion 5b protruding in the axial direction from the annular portion 5a. It is the crown type retainer 5 which was made. The bearing width is also symmetrical with respect to the center plane 20, and the distance from the center plane to the bearing end face is preferably the same.

The seal 6 is the outer ring 2 on the other side 5b of the cage 5.
It is attached only to the seal groove provided on the. FIG. 1 shows an example of a back surface combination in which the sides of the shoulder portions 10 are brought into contact with each other. The retainer 5 has a shape protruding toward the shoulder portion 10 side and not protruding toward the counterbore 9 side. Seal 6 is counterbore 9
It is assembled in the side seal groove 14. These can be arranged so that the seals 6 are on the outside of each other to form a backside combination. Further, FIG. 2 is an example of a front combination in which the counterbore 9 sides are brought into contact with each other. The retainer 5 has a shape protruding toward the counterbore 9 side and not protruding toward the shoulder 10 side. The seal 6 is assembled in the seal groove 13 on the shoulder portion 10 side. These can be arranged so that the seal 6 is on the outside of each other to form a frontal combination. Furthermore, FIG.
Is an example of a combination of three columns. The cages 5, 5 and 5 are shaped so as to project toward the counterbore 9 side and not project toward the shoulder 10 side. The seal 6 is a seal groove 13 on the shoulder 10 side.
Be assembled into. No seal is attached to the central angular contact ball bearing 1 ″, but it is sandwiched between the angular contact ball bearings 1 ′ and 1 ′ with seals on both sides. As a result, the seal 6 is arranged on the outside to form a multi-row combination. In these combinations, the outer ring 2, the ball 3, the inner ring 4, the cage 5, and the seal 6 which constitute the angular contact ball bearing with a seal.
Each component may be of one type. And the above-mentioned combination can be easily obtained by combining these.

[0013]

As described above, according to the present invention,
The slide contact surfaces of the seals are provided on both sides of the inner ring raceway symmetrically with respect to the center plane, the seal grooves are provided on both sides of the outer ring raceway, the relief parts are provided on the shoulder side, and the seal is provided on both the counter bore side and the shoulder side. Since the seals can be fitted and the seals can be placed on the outside in either the rear or front arrangement, the rear and front can be easily aligned. Further, the seals may be the same seals, and the ones without the seals can be appropriately arranged, so that the number of parts is small and the compatibility is high. Furthermore, various combinations can be easily obtained with the same component configuration. The cage is an asymmetric cage, and since the balls can be made larger to increase the load capacity and bearing rigidity, an angular ball bearing with a large load capacity and an angular ball bearing with a seal have been provided.

[Brief description of drawings]

FIG. 1 is an upper half sectional view showing a state in which two single row seal angular contact ball bearings with rear surfaces are combined, showing an example of an embodiment of the present invention.

FIG. 2 is an upper half cross-sectional view showing a state in which two single row seal angular contact ball bearings showing the example of the embodiment of the present invention are frontally combined.

FIG. 3 is an upper half sectional view showing a state in which a single row seal angular contact ball bearing with multiple rows is combined, showing an example of an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a state in which two conventional single-row sealed angular contact ball bearings are combined on the back side.

FIG. 5 is a cross-sectional view showing a state in which two conventional single-row sealed angular contact (deep groove type) ball bearings are combined.

[Explanation of symbols]

1, 1 ', 1 "Angular contact ball bearing, 2 outer ring, 3
Ball, 4 inner ring, 5 cage, 6 seal,
7 inner peripheral surface, 8 outer ring raceway, 9 counterbore, 10 shoulder, 11 outer peripheral surface, 12 inner ring raceway, 1
3, 14 Seal groove, 15 Relief portion, 16 Seal inner peripheral portion, 17 Sliding contact surface, 20 Center surface

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Fumihiro Kamiya             1-1 1-1 Fujikoshi Honmachi, Toyama City, Toyama Prefecture             Ceremony company Fujikoshinai F term (reference) 3J016 AA02 AA03 BB03 CA03                 3J101 AA03 AA32 AA42 AA54 AA62                       BA25 BA44 BA53 BA54 BA57                       BA73 FA60

Claims (2)

[Claims] 1. An outer ring having an angular outer ring raceway on an inner circumferential surface, a counterbore on one side of the outer ring raceway, and a shoulder portion thicker than the counterbore on the other side of the outer ring raceway, and an outer circumferential side surface. An angular contact ball bearing comprising an inner ring having a deep groove type inner ring raceway, a plurality of balls rolling between the outer ring raceway and the inner ring raceway, and a cage holding the plurality of balls, wherein both sides of the outer ring raceway are provided. Has a seal groove in which a seal can be fitted symmetrically about a center plane including the centers of the plurality of balls, and when a seal is fitted in the seal groove on the inner diameter side of the seal groove on the shoulder side, There is an escape portion in which the fitted seal and the shoulder portion do not interfere with each other, and the inner peripheral portion of the seal fitted in the seal groove symmetrically with respect to the center plane is provided on both sides of the inner ring raceway. It has a sliding contact surface that is slidable, Lifting instrument angular contact ball bearing that features that are not to protrude from the ball on the other side to hold the plurality of balls from one side. 2. An angular contact ball bearing with a seal, wherein the seal according to claim 1 is mounted only in the seal groove provided in the outer ring on the other side of the cage.