JPH0472083B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to single-row and double-row angular contact ball bearings.

[Conventional technology]

As shown in FIG. 5, double-row ball rolling surfaces 2, 2 are formed on the inner circumferential surface of the outer ring 1, and ball rolling surfaces 2, 2 are formed on the outer circumferential surfaces of two inner rings 10 arranged inside the outer ring 1. In a double-row angular ball bearing in which a surface 11 is provided and balls 20 are housed between the raceway surfaces 2 and 11 of the two wheels 1 and 10, the ball raceway surface 2 of the outer ring 1 is normally placed from the ball raceway surface 2 of the outer ring 1 to the non-contact side. A cylindrical surface 3 with an inner diameter approximately equal to the diameter of the circumscribed circle of the ball extends to the side surface, and a cylindrical surface 3 with an outer diameter larger than the diameter of the inscribed circle of the ball is formed on the outer peripheral surface from the ball rolling surface 11 of the inner ring 10 to the other inner ring. A surface 12 is provided.

Furthermore, in a sealed type double-row angular ball bearing, a cylindrical portion 31 formed on the outer periphery of a seal core 30 is press-fitted into the cylindrical surface 3 of the outer ring 1, and a seal lip 32 provided on the inner periphery of the seal core 30 is press-fitted into the cylindrical surface 3 of the outer ring 1. Inner ring 1
It is pressed against the outer peripheral surface of 0.

In the above double-row angular ball bearing, the outer ring 1
Since the inner diameter of the cylindrical surface 3 is approximately equal to the diameter of the circumscribed circle of the ball, the balls 20 and the retainer are assembled into the ball rolling surface 11 of the inner ring 10, and the assembled product and the outer ring 1 are arranged facing each other in the axial direction. Since the angular ball bearing can be assembled by moving the bearings relative to each other, the ball bearing has the characteristic of being easy to assemble.

When using the above-mentioned angular ball bearing to support a hub (shaft) that is a component of a front wheel drive mechanism of an automobile, for example, as shown in FIG. A double-row angular contact ball bearing A is press-fitted into the hub 41 to prevent it from coming off. However, when the hub 41 is pulled out for parts replacement or repair inspection, the inner ring 10 is fitted onto the hub 41 with a clearance. Because there are two inner rings 1
Among 0 and 10, inner ring 1 located in the pulling direction
0 may come out together with the hub 41, causing dirt to enter the inside of the bearing or damaging the seal.

Therefore, when using the double-row angular contact ball bearing as described above, it is necessary to prevent the inner ring 10 from coming off so that it does not remain on the hub 41.

As a method for preventing the inner ring 10 from coming off, as shown in FIG. Conventionally, a method for preventing slipping off by engaging 50 has been known.

[Problem to be solved by the invention]

However, the angular ball shaft as described above has the following disadvantages.

That is, the bearing incorporated in the front wheel drive mechanism of an automobile has an inner ring that rotates, and has an inner ring 10 and a hub 41.
Since it is necessary to prevent creep occurring between the inner ring 10 and the hub 41, it is necessary to provide an extremely strong fit between the inner ring 10 and the hub 41. Therefore, the connecting ring 50
The connecting ring 50 must be highly rigid and have a pull-out strength that opposes the fitting eye, and as a practical matter, it is impossible to manufacture such a connecting ring 50, and it is necessary to reliably prevent the inner ring 10 from being pulled out. I can't.

Furthermore, since the annular engagement groove 13 is formed in the inner ring 10, the rigidity of the end of the inner ring 10 is reduced, and
The end on the side where the engagement groove 13 is formed has a thin wall thickness,
The formation of the engagement groove 13 has the disadvantage that static strength is reduced.

Furthermore, the number of parts increases due to the incorporation of the connecting ring 50, making it difficult to assemble the bearing.

Therefore, the technical object of the present invention is to solve the above-mentioned disadvantages, to reliably prevent the inner ring of an angular contact ball bearing from coming off, and to improve the pull-out strength.

[Means to solve the problem]

In order to solve the above problems, in the present invention, groove-shaped ball rolling surfaces are provided on the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring fitted inside the outer ring, and a predetermined distance is provided between the ball rolling surfaces. In an angular contact ball bearing in which balls are arranged with a contact angle, there is no ball rolling on either the non-contact side of the ball rolling surface on the inner peripheral surface of the outer ring or the non-contacting side of the ball rolling surface on the outer peripheral surface of the inner ring. Forms a tapered or curved surface that slopes continuously in the direction of the pitch circle from the bottom of the groove on the running surface, and reaches the side surface of the outer ring or inner ring on the other side, and has a diameter that is approximately equal to the diameter of the circumscribed circle of the ball or the diameter of the inscribed circle of the ball. A cylindrical surface is provided, a circumferential engagement groove into which a part of the ball can fit is formed between the cylindrical surface and the ball rolling surface, and the engagement groove has an arcuate cross-sectional shape. was adopted.

Here, the pitch circle direction refers to the direction toward the other bearing ring. Therefore, when forming a tapered or curved surface on the non-contact side of the ball rolling surface of the outer ring,
The tapered surface or curved surface is sloped toward the inner ring, and conversely, when forming a tapered surface or curved surface on the non-contact side of the ball rolling surface of the inner ring, the tapered surface or curved surface is sloped toward the outer ring. .

[Effect]

When the inner ring moves axially outward relative to the outer ring,
The ball is pushed by the tapered or curved surface formed on the outer ring or the inner ring and engages in the engagement groove. When the inner ring further moves outward in the axial direction, the balls are held between the tapered surface or the curved surface and the engagement groove, and this holding prevents the inner ring from coming off.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. Note that in the figure, the same parts as those in the conventional example shown in FIG.

As shown in the figure, an engagement groove 4 having an arcuate cross-sectional shape is formed between the ball rolling surface 2 and the cylindrical surface 3 of the outer ring 1. Further, on the outer peripheral surface of the inner ring 10, a tapered surface 14 is provided from the ball rolling surface 11 to the groove bottom of the ball rolling surface 11, which is continuous from the ball rolling surface 11 to the groove bottom of the other inner ring 10. It is expanding towards 10.

1 and 2 show an example in which a hub 41 is rotatably supported like a plurality of conventional angular ball bearings, and the outer ring 1 of the bearing fitted inside the axle box 40 is Shoulder portion 42 formed on the inner peripheral surface of 40
It is prevented from coming off by a retaining ring 43 attached to its inner peripheral surface.

Note that 44 indicates a retaining ring fitting groove.

Now, in the operation of pulling out the hub 41 in the direction of the arrow in FIG.
Among 0 and 10, inner ring 1 located in the pulling direction
0 moves together with the hub 41, the tapered surface 14 of the inner ring 10 comes into contact with the inner diameter side of the ball 20, and as the inner ring 10 moves, the ball rolling surface 2 of the outer ring 1
The ball 20 comes out of the hole and is pushed up in the outer diameter direction by the force applied to the inner diameter side.

When the inner ring 10 further moves in the same direction, a portion of the ball 20 fits into the engagement groove 4, as shown in FIG. 3, and the ball 20 is held between the engagement groove 4 and the tapered surface 14. , the inner ring 10 can be prevented from coming off.

In addition, as shown in FIG. 3, the cylindrical surface 3 of the outer ring 1
A seal core bar 30 is attached to the core bar 30, and an inclined seal lip 32 that can be pressed against the outer circumferential surface of the inner ring 10 is provided on the inner peripheral edge of the core bar 30. Since the movement of the ball 20 can be elastically restrained, the ball 20 can be reliably moved in the outer radial direction.

In the case of the embodiment, the cylindrical surface 3 and the engagement groove 4 were provided on the inner circumferential surface of the outer ring 1, and the tapered surface 14 was formed on the outer circumferential surface of the inner ring 10, but the tapered surface was formed on the inner circumferential surface of the outer ring 1. However, a cylindrical surface and an engagement groove having a diameter substantially equal to the diameter of the ball inscribed circle may be provided on the outer peripheral surface of the inner ring.

Furthermore, in the embodiments shown in FIGS. 1 to 3, a double-row angular ball bearing is shown, but as shown in FIG. In a single row angular contact ball bearing with balls 20 arranged between them, an engagement groove is provided on either the inner circumferential surface of the outer ring 1 or the outer circumferential surface of the inner ring 10, and a tapered surface 14 or a curved surface is formed on the other to prevent the inner ring 10 from coming off. You may try to stop it.

〔effect〕

As described above, according to the present invention, when the inner ring moves axially outward, the tapered surface or curved surface pushes the ball toward the engagement groove, so that the engagement groove and the tapered surface or curved surface reliably push the ball. Can be held. For this reason, it is possible to reliably prevent the inner ring from coming off, and it is also possible to obtain extremely high pull-out strength.

Further, since the engagement groove has an arcuate cross section, it is possible to prevent the ball from being scratched when the ball is held between the engagement groove and the tapered or curved surface.

Furthermore, since the diameter of the cylindrical surface is approximately equal to the diameter of the ball's inscribed circle or the ball's circumscribed circle, the ball is assembled into a raceway having a tapered or curved surface, and the assembly and the raceway having a cylindrical surface are connected in the axial direction. Since the angular contact ball bearing can be assembled by moving the angular contact ball relative to the angular contact ball bearing, the ball bearing can be easily assembled in the same way as a conventional angular contact ball bearing.

[Brief explanation of the drawing]

1 to 4 show how the angular ball bearing according to the present invention is used, and FIG. 1 is a sectional view showing how the double row angular ball bearing is used, and
The figure is an enlarged cross-sectional view of the same as the above, Figure 3 is a cross-sectional view showing the state in which the inner ring of the above is prevented from falling out, Figure 4 is a cross-sectional view of the single row angular ball bearing as above, and Figures 5 and 6 are conventional angular bearings. It is a sectional view of a ball bearing. 1... Outer ring, 2... Rolling surface, 3... Cylindrical surface, 4
……Engagement groove, 10… Inner ring, 11… Rolling surface, 1
4...Tapered surface, 20...Ball.

Claims (1)

[Claims] 1. In an angular ball bearing in which groove-shaped ball raceway surfaces are provided on the inner circumferential surface of an outer ring and the outer circumferential surface of an inner ring fitted inside the outer ring, and balls are arranged with a predetermined contact angle between the ball raceway surfaces. , on either the non-contact side of the ball rolling surface on the inner circumferential surface of the outer ring or the non-contact side of the ball rolling surface on the outer circumferential surface of the inner ring, a groove is provided continuously from the bottom of the groove on the ball rolling surface in the pitch circular direction. A tapered surface or curved surface with a slope is formed, and a cylindrical surface extending to the side surface of the outer ring or inner ring and having a diameter approximately equal to the diameter of the circumscribed circle of the ball or the diameter of the inscribed circle of the ball is provided on the other side, and the ball rolls with this cylindrical surface. An angular ball bearing characterized in that a circumferential engagement groove into which a part of the ball can fit is formed between the bearing surface and the engagement groove has an arcuate cross-sectional shape.