JP2000249154A - Sealed rolling bearing - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the grease fluidity on the back surface of a non-contact seal to reliably achieve a grease seal effect, and to reliably prevent carbon brush abrasion powder from entering the inside of a bearing using a non-contact seal. Another object of the present invention is to provide a sealed rolling bearing which extends the life of the bearing and the grease. In a rolling bearing provided with a shield (7) located between an outer ring (1) and an inner ring (4) and forming a labyrinth with an inner ring circumferential groove (6), the shield (7) is grease bent inward in the axial direction. The flow guide portion 11 is provided on the back surface of the shield, the inner peripheral edge is bent outward in the axial direction, and the outer bent portion forms a minute labyrinth with the peripheral groove 6 at the inner ring outer diameter 5 end. The grease 20, which is guided to flow along the guide portion 11, merges with the grease 20 flowing from the inner ring outer diameter 5, flows into the labyrinth S, and embeds the labyrinth S to form a grease seal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing type rolling bearing for a brush motor used in automobiles, home electric appliances and the like.

[0002]

2. Description of the Related Art A large number of brush motors are used in automobiles and home electric appliances, and a non-contact iron plate seal (shield) 10 is mounted on a bearing 300 built in the motor.
0 is used (FIGS. 3 and 4).

[0003]

However, in the iron plate shield provided in the conventional sealed rolling bearing as described above, the brush wear powder passes through the labyrinth portion 200 of the shield 100 and enters the inside of the bearing 300. There is a possibility that there is a possibility that the grease life may be prolonged.

That is, since the gap between the shield back surface 101 and the inner ring peripheral groove 301 (indicated by an arrow L) has been widened in the past, the grease 400 blown off to the shield back surface 101 has
Was difficult to merge with the grease 400 flowing from the inner ring outer diameter 302, and as a result, it was difficult to form a grease seal (FIGS. 3 and 4).

[0005] As a means for preventing such abrasion powder from penetrating, a contact-type seal may be employed.
Alternatively, it is known that a non-contact type sealing portion is provided outside the bearing as in Japanese Utility Model Application Laid-Open Publication No. 56-27856 to positively prevent brush abrasion powder from entering the inside of the bearing.

[0006] However, as the speed has been increased in recent years, a reduction in the torque of the bearing has been required, and a contact-type seal cannot be used under such a request. Therefore, how to prevent intrusion of brush abrasion powder with a non-contact seal, particularly a low-cost iron plate seal (shield), has become a major issue.

[0007] The present invention has been made in view of such problems of the prior art.
The grease fluidity on the back surface of the non-contact seal is improved to ensure the grease seal effect, and to prevent the intrusion of carbon brush abrasion powder into the inside of the bearing using the non-contact seal, and to extend the life of the bearing and grease. To provide a sealed rolling bearing.

[0008]

In order to achieve the above-mentioned object, the present invention provides a technical means in which an outer peripheral edge is fixed to a peripheral groove at an inner ring inner end, and an inner peripheral edge is a peripheral groove at an inner ring outer diameter end. A non-contact seal that forms a labyrinth between the seal and the seal, the seal has a grease flow guide portion that is bent inward in the axial direction on the back surface of the seal, and the inner peripheral edge is bent outward in the axial direction. The bent portion forms a minute labyrinth with the peripheral groove at the outer diameter end of the inner ring.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is an outer ring, 4 is an inner ring, 7 is a non-contact seal (also called a shield), 18 is a rolling element, 19
Indicates a retainer, and 20 indicates grease. The rolling elements 18 and the retainers 19 are not particularly limited to the illustrated examples, and other well-known forms can be appropriately selected and used.

The outer ring 1 may have a well-known structure in which a peripheral groove 3 is provided at the end of the inner diameter 2. The outer peripheral edge 8 of the non-contact seal 7 is fixed (press-fitted) in the peripheral groove 3, and Periphery 15 and inner ring 4
A small labyrinth S is formed between the end portion of the outer diameter 5 and the circumferential groove 6 having a substantially L-shaped cross section.

The non-contact seal 7 has an outer peripheral edge 8 and an extension 9 extending obliquely downward and obliquely outward from the outer peripheral edge 8.
An intermediate portion 10 extending radially from the extension portion 9, and a grease flow guide portion (bent portion) 11 formed between the intermediate portion 10 and the inner peripheral edge 15 in a concave shape inward in the axial direction. To form a disk shape.

Further, the non-contact seal 7 in the present embodiment
Uses an iron plate shield for cost reduction, but the material, thickness, size and the like are not particularly limited, and for example, a structure in which the iron plate shield is covered with rubber can be arbitrarily changed.

Accordingly, the intermediate portion 10 and the grease flow guide portion 11 are continuous between the outer peripheral edge 8 and the inner peripheral edge 15 in an uneven shape when viewed from the front surface 16 side and in an uneven shape when viewed from the back surface 17 side. .

In the present embodiment, the grease flow guide portion (bent portion) 11 includes an inward bent portion 12 that is bent downward and inward from the intermediate portion 10 of the shield 7 in the axial direction, and an inward bent portion. An extension 13 extends in the radial direction from 12 and an outer bend 14 bent axially outward from the extension 13, and the tip of the outer bend 14 is an inner peripheral edge 15.

It is also within the scope of the present invention that the outward bent portion 14 is formed to be inclined downward in the axial direction.

The inwardly bent portion 12 is made of grease 2
Since the flow guide of 0... Becomes smooth, it is bent in a downwardly inclined shape inward in the axial direction, but this does not prevent it from being bent in the axial direction without being made into the downwardly sloped shape. .

Further, in the present embodiment, the inwardly bent portion 12
Although the extension 13 is provided between the outer bend 14 and the outer bend 14, the outer bend may be directly continued from the inner bend without providing the extension 13.

In the present embodiment, the grease flow guide 11
Are formed at positions opposed to the inner ring outer diameter 5. That is, the inner bent portion 12 in the grease flow guide portion 11
Is located at a position facing the inner ring outer diameter 5, so that the space between the grease flow guide portion 11 and the inner ring outer diameter 5 (indicated by an arrow L in the drawing) approaches.

Accordingly, when the grease 20 blown to the shield back surface 17 is smoothly guided along the inclined surface of the inner bent portion 12 and reaches a position opposed to the outer diameter 5 of the inner race, the grease 20 is moved to the narrow position. (Indicated by L in the figure) and inner ring outer diameter 5
And easily merges with the grease 20 flowing in the labyrinth S direction to form a grease seal.

In the present embodiment, the grease flow guide portion 11 is formed near the inner peripheral edge 15 of the shield 7, and the grease flow guide portion is formed between the outer peripheral edge 8 and the inner peripheral edge 15 of the shield 7. The guide portion 11 is formed by selecting any one of the portions, and the guide portion 11 is most preferably formed continuously in the circumferential direction as in the present embodiment, but is provided discontinuously at intervals. It may be a thing.

The circumferential groove 6 having a substantially L-shaped cross section formed at the end of the outer diameter 5 of the inner race 4 is preferably formed on an inclined surface from the inside to the outside of the bearing. In other words, the brush abrasion powder is splashed off by the centrifugal force, which has a dustproof effect.

Therefore, by configuring the shield 7 as described above, the grease flow guide portion (bent portion) 11 of the shield 7 has a shape that facilitates the flow guide of the grease 20 to the labyrinth S. Grease 20
Greases 20 flow into the labyrinth S,
Since the labyrinth S is completely filled with the greases 20..., An optimal grease seal for the labyrinth S is formed. As a result, intrusion of brush abrasion powder is prevented, and the life is extended.

[0023]

As described above, the present invention has the above-described structure, so that an optimal grease seal is formed in the labyrinth portion.
In the bearing provided with the non-contact seal, penetration of brush wear powder into the bearing can be prevented, and the life of the bearing and grease can be extended. Therefore, since a reliable sealing effect is exhibited without using a contact seal, a lower torque (higher speed) is achieved.
And the cost can be reduced because a low-cost iron plate shield can be used.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of a sealed rolling bearing of the present invention.

FIG. 2 is an enlarged longitudinal side view showing the vicinity of a shield end in the present invention.

FIG. 3 is a vertical sectional side view showing a conventional technique.

FIG. 4 is an enlarged longitudinal side view showing the vicinity of a shield end in a conventional technique.

[Explanation of symbols]

1: outer ring 2: outer ring inner diameter 3: peripheral groove 4: inner ring 5: inner ring outer diameter 6: L-shaped peripheral groove 7: shield 8: outer peripheral edge 10: intermediate portion 11: grease flow guide portion 15: inner peripheral edge 20: grease

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Ogawa 1-5-50 Kugenuma Shinmei, Fujisawa City, Kanagawa Prefecture Inside Nippon Seiko Co., Ltd. (72) Inventor Kenji Takei 1-5-50 Kugenuma Shinmei, Fujisawa City, Kanagawa Prefecture No. Nippon Seiko Co., Ltd. F-term (reference) 3J016 AA02 BB17 CA02

Claims (1)

[Claims] 1. A non-contact seal, wherein an outer peripheral edge is fixed to a peripheral groove at an inner ring inner diameter end and an inner peripheral edge forms a labyrinth with an inner ring outer diameter end peripheral groove, wherein the seal is formed in an axial direction. A grease flow guide that bends inward is provided on the back surface of the seal, the inner peripheral edge is bent outward in the axial direction, and the outer bent portion forms a minute labyrinth with the circumferential groove at the outer diameter end of the inner ring. A sealed rolling bearing, characterized in that: