JPS6316897Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in a rolling bearing device in which a hairpin-shaped retaining ring is fitted in an eccentric groove of the outer ring of the bearing to prevent creep of the outer ring within the bearing box.

A conventional bearing device of this type for use in an automotive alternator or the like is shown in longitudinal sectional view and front sectional view in FIGS. 1 and 2. 1 is the bearing box,
2 is a rotating shaft; 3 is a bearing box 1 fixed to this rotating shaft;
This is a ball bearing fitted into the inner circumferential portion 1a of the ball bearing, and consists of an inner ring 4, an outer ring 5, balls 6, and a cage 7 (the cage is not shown in Fig. 2). 8 is an annular eccentric groove formed on the outer circumference of the outer ring 5, and 9 is a retaining ring formed in a hairpin shape (approximately semicircular U-shape) and fitted in the deep side of the eccentric groove 8. This retaining ring 9 is made of a metal spring material, and has a square cross section as shown in FIGS. The inner circumferential portion 1a surface of 1 is elastically pressed.
This prevents circumferential creep of the outer ring 5 due to rotation of the inner ring 4 side.

In assembling the bearing 3, the bearing 3 is fixed to the rotating shaft 2, the retaining ring 9 is fitted into the eccentric groove 8 of the bearing, and the retaining ring 9 is fitted into the inner circumferential portion 1a of the bearing box 1 in the axial direction. The head 9a is pushed in while elastically pressing the surface of the inner circumferential portion 1a. For this reason, as shown in FIG. 1, the corner of the outer edge of the head 9a of the retaining ring 9 gnaws against the surface of the inner circumference 1a, causing a gnawing mark 1b, and when the insertion is complete, the outer ring 5 is attached to the inner ring 4. On the other hand, the bearing 3 is mounted at an angle θ, and the bearing 3 receives a moment load.

When the rotating shaft 2 is rotated in the state of the bearing device shown in FIG. 1, and after a certain period of time, the state becomes as shown in FIG. 5, which sequentially shows the progress state leading to bearing failure. That is, when the outer ring 5 rotates around the rotary shaft 2 in a tilting device state as shown in FIG. 1, flaking occurs on the elliptical orbit due to a well-known moment load on the bearing 3, as shown in FIG. 5A. 11. If the operation continues, the balls 6 will gradually wear out and become deformed due to flaking 12, as shown in Figure B. If it is continued to be used in this state, the retainer 7 will be damaged due to abnormal force mainly due to the deformation of the raceway surface and balls 6, resulting in damage as shown in Figure C, and in some cases, broken pieces may be attached to the raceway surface. The lubricant falls off and is abraded between the ball 6 and the raceway, turning into metal powder and deteriorating the lubricant. Next, as shown in Fig. D, the balls 6 scatter to the outside, but the deepest part of the eccentric groove 8, which is the weakest part of the outer ring 5, becomes the passage for the balls 6 to fly out, and this part instantly becomes ductile. Destroy.

Furthermore, in the conventional device described above, the corners of the outer edges on both sides of the eccentric groove 8 of the outer ring 5 are sharp, and when the bearing 3 is inserted into the inner circumferential portion 1a of the bearing box 1, the retaining ring 9
It has been found that, similarly to the head 9a, the corners of the eccentric groove 8 grip the surface of the inner circumferential portion 1a, causing the outer ring 5 to incline.

This invention was made to eliminate the drawbacks of the conventional device described above, and by chamfering the outer edge corner of the head of the retaining ring, and also chamfering the outer edge corners on both sides of the eccentric groove of the outer ring, To provide a rolling bearing device that prevents galling of the inner circumferential surface by the head of the retaining ring and the outer edge of the eccentric groove of the outer ring when inserting the bearing into the inner circumference of a bearing box, and eliminates the need for inclined mounting of the outer ring. It is intended to.

FIG. 6 is a longitudinal sectional view of a rolling bearing device according to an embodiment of this invention, and shows 1, 1a, 2, 4,
6 and 7 are the same as those of the conventional device. The outer ring 22 of the ball bearing 21 has an annular eccentric groove 2 on the outer circumference.
3 is formed, and the corners of the outer edges on both sides of this eccentric groove are chamfered 23a with an inclination angle α of 15 to 60 degrees. Reference numeral 24 denotes a retaining ring made of a metal spring material with a square cross section, formed in the shape of a hairpin (approximately semicircular U-shape), and fitted into the deep side of the eccentric groove 23. The outer edge corner of the radially projecting head 24a of the intermediate portion of this retaining ring is chamfered 24c with an inclination angle β of 15 to 60 degrees. In addition, in the figure, retaining ring 2
The solid line 4 shows the state before insertion into the bearing box 1, and the chain line shows the state after insertion. The retaining ring 24 is shown in a front view in FIG. 7, and cross sections of the head 24a and both legs 24b are shown in FIGS. 8 and 9.

In this way, the bearing 21 has chamfered outer edges on both sides of the eccentric groove 23, and a chamfered outer edge of the head 24a of the retaining ring 24 fitted in the eccentric groove 23.
When inserted into the inner circumferential portion 1a of the bearing box 1, the surface of the inner circumferential portion 1a is not bitten by the head 24a of the retaining ring or the outer edge of the eccentric groove 23, so that the inner ring 2
2 is installed with almost no tilting. This prevents the bearing 21 from being damaged.

FIG. 10 is a front view of a retaining ring according to another embodiment of this invention. The corners of the outer and inner edges of the head 25a of the retaining ring 25 are chamfered 25c with a large radius to have a circular cross section, as shown in the sectional view in FIG. Both legs 25b of this retaining ring 25 are the first
As shown in the cross-sectional view in Figure 2, the cross-section remains square.

In the above embodiment, the outer corner of the head of the retaining ring is chamfered with an inclined surface or a circular surface, but it may be chamfered with a rounded arc surface, and the shape of the chamfered head is , the cross section may be semicircular, oval, or oval.

Further, the chamfering of the corner portions of the outer edges on both sides of the eccentric groove of the outer ring may be rounded with circular arc surfaces.

As described above, according to this invention, since the outer edge corners on both sides of the eccentric groove of the outer ring and the outer edge corner of the head of the retaining ring are chamfered, when inserting the bearing into the inner circumference of the bearing box, Scuffing of the inner circumferential surface by the head of the retaining ring and the corners of the eccentric groove is prevented, the outer ring can be mounted with almost no inclination, and damage to the bearing due to this is eliminated.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a conventional bearing device, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Figs. 3 and 4 are sectional views taken along the - line and - line of the retaining ring in Fig. 2. , FIG. 5 is an explanatory diagram showing in order the progress of the bearing in the state shown in FIG. 1 until it is damaged due to rotation,
FIG. 6 is a longitudinal sectional view showing a bearing device according to an embodiment of the invention with the retaining ring in a state before it is inserted into the bearing box, FIG. 7 is a front view of the retaining ring shown in FIG. 6, and FIGS. 9 is a sectional view taken along lines - and - in FIG. 7, FIG. 10 is a front view of a retaining ring according to another embodiment of the invention, and FIGS.
FIG. 2 is a sectional view taken along the XI-XI line and the XII-XII line in FIG. In the figure, 1... Bearing box, 1a... Inner circumferential part, 2... Rotating shaft, 4... Inner ring, 21... Ball bearing, 22... Outer ring, 23... Eccentric groove, 23a...
Chamfer, 24...Retaining ring, 24a...Head, 24
c... Chamfer, 25... Retaining ring, 25a... Head, 25c... Chamfer. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A ball bearing with a hairpin-shaped retaining ring fitted on the deep side of an eccentric groove provided on the outer circumference of the bearing outer ring,
In the bearing device inserted into the inner circumference of the bearing box, chamfering the outer edge corner of the eccentric groove of the outer ring,
The retaining ring has a rectangular cross section, and the outer corner of the head that protrudes outward in the middle part is chamfered,
A rolling bearing device characterized in that the outer ring of the ball bearing is prevented from being mounted at an angle by insertion into the inner circumference of the bearing box. (2) The rolling bearing device according to claim 1, wherein the outer corner of the eccentric groove is chamfered with an inclined surface of 15 to 60 degrees. (3) The rolling bearing device according to claim 1 or 2, wherein the outer edge corner of the head of the retaining ring is chamfered with an inclined surface of 15 to 60 degrees. (4) The rolling bearing device according to claim 1 or 3, wherein the outer corner of the eccentric groove is chamfered with an arcuate surface. (5) The rolling bearing device according to any one of claims 1, 2, and 4 of the utility model registration claim, characterized in that the outer edge corner of the head of the retaining ring is chamfered with an arcuate surface. (6) A statement in any one of claims 1, 2, and 4 of the utility model registration claim characterized in that the outer edge corner of the head of the retaining ring is chamfered with an arcuate surface so that the cross section is semicircular. Rolling bearing device. (7) A utility model registered as claimed in any one of claims 1, 2, and 4, characterized in that the outer and inner edges of the head of the retaining ring are chamfered with arcuate surfaces to have a circular cross section. Rolling bearing device. (8) A statement in any one of claims 1, 2, and 4 of the utility model registration claim, which is characterized in that the outer and inner edges of the head of the retaining ring are chamfered with arcuate surfaces and have an oval cross section. Rolling bearing device.