JP6866567B2 - Self-aligning roller bearing - Google Patents

Description

The present invention relates to a self-aligning roller bearing, and more specifically, to a self-aligning roller bearing with a seal provided with a sealing member.

Self-aligning roller bearings generally have a structure in which a barrel-shaped spherical roller is incorporated between the spherical outer ring raceway surface of the outer ring and the inner ring raceway surface of the double row of inner rings. Since the center of curvature of the raceway surface coincides with the center of the bearing, if the shaft or housing bends or the center of the axis does not match, a predetermined centering angle is formed between the inner ring and the outer ring, and the centering is automatically performed. (See, for example, Patent Document 1). Further, in the self-aligning roller bearing described in Patent Document 1, the position of the lip of the seal member mounted on both ends is set on or outside the spherical surface including the raceway surface of the outer ring, and the raceway surface of the outer ring is visually inspected. It's easy.

FIG. 4 is a cross-sectional view of a conventional self-aligning roller bearing in normal times. As shown in FIG. 4, the conventional self-aligning roller bearing 10 has an outer ring 11, an inner ring 12, and a spherical outer ring raceway surface 11a of the outer ring 11 and a double-row inner ring raceway surface 12a of the inner ring 12. A plurality of interposed spherical rollers 13 and a cage 14 for holding the plurality of rollers 13 are provided.

Further, in the conventional self-aligning roller bearing 10, in order to prevent leakage of the lubricant sealed inside the bearing and foreign matter from the outside into the bearing, both ends in the axial direction between the outer ring 11 and the inner ring 12 are prevented. A seal member 20, 20'composed of a core metal 21, 21'and an elastic body 22, 22' is provided. Then, lip portions 22a, 22a'are provided at the tip portions of the elastic bodies 22, 22', and the lip portions 22a, 22a'are brought into contact with the outer peripheral surface of the inner ring 12.

Japanese Unexamined Patent Publication No. 9-88949

By the way, as shown in FIG. 5, in the conventional self-aligning roller bearing with a seal, the centering angle of the self-aligning roller bearing may exceed a certain angle when mounted on the device, and the spherical roller 13 Causes an excessive inclination toward the seal member 20, and the contact state between the lip portion 22a'and the inner ring 12 of the seal member 20'on the opposite side of the seal member 20 is broken, and the lip portion 22a'and the inner ring 12 A gap is generated between the gaps, and foreign matter such as dust is mixed in from this gap, or the lubricant inside the bearing leaks.

The present invention has been made in view of the above problems, and an object of the present invention is an automatic centering roller capable of controlling the centering angle of the bearing and, by extension, maintaining the sealing property of the sealing member. To provide bearings.

The above object of the invention is achieved by the following configuration.
(1) In a self-aligning roller bearing including an outer ring, an inner ring, a plurality of spherical rollers interposed between the outer ring and the inner ring, and sealing members provided at both ends in the axial direction of the outer ring. The sealing member includes a core metal and an elastic body having a lip portion extending radially inward from the core metal, and the elastic body is provided in the axial direction of the spherical roller in the axial direction of the core metal. A self-aligning roller bearing characterized by having a protruding portion facing the end face.
(2) The elastic body has a mounting portion that fits into the seal mounting groove of the outer ring, and the protruding portion projects axially inward from the axial inner side surface of the mounting portion. The self-aligning roller bearing according to (1).

According to the self-aligning roller bearing of the present invention, the bearing alignment angle at the time of bearing assembly can be controlled by the protruding portion of the seal member, and the sealability of the seal member can be maintained.

(A) is a cross-sectional view of a self-aligning roller bearing according to an embodiment of the present invention in normal times, and (b) is an enlarged view of part I of (a). It is sectional drawing at the time of self-alignment of the self-aligning roller bearing of FIG. It is a figure which shows the deformation example of the protrusion | protrusion of the seal member of the self-aligning roller bearing of FIG. It is sectional drawing of the conventional self-aligning roller bearing in normal times. It is sectional drawing at the time of bearing assembly of the conventional self-aligning roller bearing.

Hereinafter, the self-aligning roller bearing according to the embodiment of the present invention will be described with reference to the drawings. For convenience of explanation, the same or equivalent parts as those of the conventional self-aligning roller bearing shown in FIG. 4 are designated by the same reference numerals. However, the technical scope of the present invention is not limited to the embodiments described below.

FIG. 1A is a cross-sectional view of the self-aligning roller bearing according to the present invention in normal times. As shown in FIG. 1A, the self-aligning roller bearing 10 according to the present invention has an outer ring 11 having a spherical outer ring raceway surface 11a on the inner peripheral surface and a double-row inner ring raceway surface 12a on the outer peripheral surface. A plurality of spherical rollers 13 rotatably interposed between the inner ring 12, the outer ring raceway surface 11a of the outer ring 11, and the inner ring raceway surface 12a of the inner ring 12, and seal members provided at both ends of the outer ring 11 in the axial direction. 20 and 20'are provided. The center of curvature of the outer ring raceway surface 11a coincides with the center of the bearing, and the spherical roller 13 slides along the outer ring raceway surface 11a so that it can be centered to a constant centering angle.

Further, as shown in FIG. 1B, the sealing members 20, 20'are integrally formed with the core metal 21 and 21'and the core metal 21 and 21'by injection molding, and the core metal 21 and 21' It has elastic bodies 22, 22 ′ made of rubber or elastomer that cover the outer surface in the axial direction of ′. The elastic bodies 22 and 22'are fitted to the lip portions 22a and 22a' that extend radially inward from the core metal 21 and 21'and come into contact with the outer peripheral surface of the inner ring 12 and the seal mounting groove 11b of the outer ring 11. It has portions 22b and 22b'and protruding portions 22c and 22c' facing the axial end surface of the spherical roller 13 inside the core metal 21 and 21'in the axial direction.

The protruding portions 22c and 22c'are formed on the radial inside of the mounting portions 22b and 22b' and continuously with the mounting portions 22b and 22b', and form the inner peripheral surface of the cylindrical portion of the core metal 21 and 21'. It covers and is formed from the cylindrical portion to the flange portion of the core metal 21 and 21'. Further, the projecting portions 22c and 22c'protrude inward in the axial direction from the axial inner side surfaces of the mounting portions 22b and 22b'. Further, it is preferable that the axial inner surfaces of the protruding portions 22c and 22c'are designed to be substantially parallel to the axial end surface of the spherical roller 13 when the spherical roller 13 is tilted to the allowable centering angle.

By the way, when the bearing is assembled into the device, as shown in FIG. 2, the spherical roller 13 is tilted, and the inner ring 12 is tilted to the right accordingly, but the presence of the protrusion 22c causes the inner ring 12 to be excessively tilted. No gap is formed between the lip portion 22a'and the inner ring 12. Further, even at the centering angle at which the spherical roller 13 abuts on the protruding portion 22c of the seal member 20 provided at the axial end on the right side, the lip portion 22a ′ of the seal member 20 provided at the axial end on the left side. Contact the outer peripheral surface of the inner ring 12. Similarly, since the left sealing member 20'is also provided with the protruding portion 22c', the spherical roller 13 is aligned so as to come into contact with the protruding portion 22c'of the sealing member 20'provided at the axial end on the left side. Even in terms of angle, it is possible to maintain a state in which the lip portion 22a'of the seal member 20 provided at the axial end portion on the right side is in contact with the outer peripheral surface of the inner ring 12. Further, even if the spherical roller 13 is tilted, the spherical roller 13 comes into contact with the protruding portion 22c of the seal member 20, so that the contact with the core metal 21 can be prevented.

By adjusting the degree of protrusion of the protruding portions 22c and 22c', the degree of inclination of the spherical roller 13 can be arbitrarily controlled.

Therefore, according to the self-aligning roller bearing 10 of the present embodiment, by providing the protruding portions 22c and 22c'on the sealing members 20 and 20', the centering angle is controlled and the spherical roller 13 is prevented from being excessively tilted. As a result, it is possible to prevent the lubricant from leaking or foreign matter from entering the bearing.

The present invention is not limited to the above-described embodiment, and can be freely modified, improved, and the like as appropriate.
For example, in the above embodiment, the projecting portions 22c and 22c'protrude axially inward from the axial inner surface of the mounting portions 22b and 22b', but the projecting portion of the present invention is a self-aligning roller bearing. It is not limited as long as it can control the degree of inclination of the spherical roller when assembled into the device.

Specifically, as in the modified example shown in FIG. 3A, the axial inner surfaces of the protruding portions 22c and 22c'and the mounting portions 22b and 22b' may be formed flush with each other. The protruding portions 22c and 22c'can come into contact with the end surface of the roller 13 on the inner surface surface in the axial direction thereof.
Alternatively, as in the modified example shown in FIG. 3B, even if the axial inner side surfaces of the protruding portions 22c and 22c'are located axially outer than the axial inner side surfaces of the mounting portions 22b and 22b'. Good. The shape of the protruding portion is formed in a stepped shape along the curved portion of the core metal, and the stepped surfaces 22c1, 22c1'make it possible to contact the end surface of the roller 13 shown in FIG.
In each of the modified examples shown in FIGS. 3 (a) and 3 (b), as in FIG. 1 (b), the protruding portions 22c and 22c'have a constant thickness in the axial direction, so that the spherical roller 13 is constant. It is possible to prevent the spherical roller 13 from being excessively tilted while tilting to an angle.

10 Self-aligning roller bearing 11 Outer ring 11a Outer ring raceway surface 11b Seal mounting groove 12 Inner ring 12a Inner ring raceway surface 13 Roller 14 Cage 20,20' Seal member 21,21' Core metal 22, 22' Elastic body 22a, 22a' Lip Parts 22b, 22b'Mounting parts 22c, 22c'Protruding parts

Claims (2)

In a self-aligning roller bearing including an outer ring, an inner ring, a plurality of spherical rollers interposed between the outer ring and the inner ring, and sealing members provided at both ends in the axial direction of the outer ring.
The sealing member includes a core metal and an elastic body.
The elastic body is formed of a lip portion extending radially inward from the core metal, a mounting portion that fits into the seal mounting groove of the outer ring, and the mounting portion continuously inside the core metal in the axial direction. Rutotomoni opposite to the axial end surface of the spherical roller, self-aligning roller bearings, characterized in that it has a, and the spherical rollers can abut protrusions when the spherical rollers is tilted. The self-aligning roller bearing according to claim 1, wherein the protruding portion protrudes inward in the axial direction from the inner side surface in the axial direction of the mounting portion.

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