JP2526390Y2 - Bearing seal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a seal for a bearing used in a severe place exposed to dust, muddy water and the like.

(Prior Art) As a conventional bearing seal of this type, for example, there is one as shown in FIG. That is, it seals a gap between the inner race 100 and the outer race 101 of the bearing, and a sleeve 103 fitted around the outer race 101 and a sleeve 103 fitted around the inner periphery of the outer race 101 so as to be slidably sealed. And a seal body 105 having a seal lip 104 that comes into contact therewith. The sleeve 103 has a radially outwardly extending flange 106 for sealing a gap 107 at the outer end of the flange 106 that opens outwardly of the bearing between the flange 106 and the seal body 105. Dust strip 108 is provided.

FIG. 3 shows another conventional example.
A dust lip 108 for sealing a gap 107 between the outer end of the flange 106 and the seal body 105 is doubled to enhance the sealing effect.

(Problems to be Solved by the Invention) However, in the case of the above-mentioned conventional technology, a dust seal 108 is provided by providing a dust lip 108 that slidably contacts a seal body 105 with a gap 107 that opens outward. Therefore, the seal portion 109 is directly exposed to foreign matter such as muddy water, and there is a problem that the dust lip 104 is worn quickly.

To avoid the wear of the dust lip 104, the fourth
As shown in the figure, the dust lip 104 is slid on the inner surface of the flange 106 of the sleeve 103 to form a seal portion 109 inside the flange 106, so that the seal portion 109 is not directly exposed to foreign substances such as muddy water. Things are also known.

However, in the case of this conventional example, although consideration is given to the prevention of the intrusion of the foreign matter, the consideration of the external discharge of the foreign matter is insufficient. Ie sleeve
When external foreign matter enters the inside through the gap 107 between the seal 103 and the seal body 105, the foreign matter that has entered is accumulated, and as a result, the foreign matter enters the seal portion 109. Such an external discharge problem similarly exists in the seals described above with reference to FIGS. 2 and 3.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a high-performance bearing seal having an effect of externally discharging foreign substances such as muddy water that has entered the inside of the seal. It is in.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, a cylindrical inner ring portion fitted on the outer periphery of the inner race and an outer diameter from a bearing inner end of the inner ring portion to the inner ring portion. And an outward flange extending obliquely to the outer side of the bearing of the inner ring portion, and formed so that the bearing outer end of the inner ring portion is flush with the bearing outer side end surface of the inner race. A sleeve, a cylindrical outer ring fitted to the inner periphery of the outer race, and an inward flange extending inwardly from the bearing inner end of the outer ring, and a bearing outer end of the outer ring. A metal ring formed so as to be flush with a bearing outer end surface of the outer race, the metal ring having a dust lip slidingly contacting the inclined surface of the flange, Bearin on the inner circumference It is characterized in that a passage for discharging foreign matter, whose diameter increases from the inside of the bearing toward the outside of the bearing, is formed.

(Operation) In the bearing seal having the above-described configuration, a passage for discharging foreign matter that expands in diameter from the inside of the bearing toward the outside of the bearing is formed, so that the inclined surface expands in the outer diameter direction and toward the outside of the bearing seal. Is formed, and foreign matter such as muddy water which has entered the passage is cut off by the dust lip, and is discharged to the outside along the inclined surface by centrifugal force generated by the rotation of the sleeve or the seal body, and the foreign matter enters the passage. There is no accumulation.

Further, even at the time of stop, muddy water and the like is discharged to the outside without collecting in the seal through the passage at the lower end of the shaft.

(Example) Hereinafter, the present invention will be described based on an illustrated example.
In FIG. 1 showing a bearing seal according to an embodiment of the present invention, reference numeral 1 denotes an entire bearing seal, which is generally a sleeve having an outwardly extending flange 3 fitted to an inner race 2 of the bearing. And a seal body 8 having a rubber-like elastic duster strip 7 fitted to the outer race 5 and slidingly contacting the bearing inclined surface 6 of the flange 3 of the sleeve 4.

The sleeve 4 is composed of an inner ring portion 9 fitted on the outer periphery of the inner race 2 and the flange 3 extending in the outer radial direction from the inner end of the inner ring portion 9 in the axial bearing. The flange 3 has a taper which is inclined so as to expand from the inner side to the outer side in the axial direction as going from the inner diameter to the outer diameter. In this embodiment, the flange 3 is inclined at approximately 45 degrees in the axial direction. ing.

On the other hand, the seal body 8 is composed of a metal ring 10 having an L-shaped cross section and a rubber-like elastic body 11 integrally fixed to the metal ring 10 by baking. This rubber-like elastic body 11 is
A first rubber portion 14 fixed to the inner circumference of the outer ring portion 12 and the first rubber portion 14, which is provided so as to cover the inner circumference of the outer ring portion 12 and the outer end surface of the inward flange portion 13. And a second rubber portion 15 fixed to the outer end face of the inward flange portion 13.

The dust lip 7 provided on the seal body 8 is provided concentrically and doubly in the middle of the inward flange portion 13. Slidably close to

A lip 41 made of a rubber-like elastic body is formed so as to protrude toward the inside of the bearing in the axial direction at a bent portion between the inner ring portion 9 and the flange 3 of the sleeve. A minute gap 17 is formed between the inward flange 13 and the inner end thereof.

The first rubber portion 14 has a tapered surface which is separated from the flange 3 of the sleeve 4 by a predetermined distance and is inclined so as to gradually expand outward so as to be substantially parallel to each other. The clearance between the portion 14 and the flange 3 constitutes the passage 16 for foreign matter discharge of the present invention. That is, the clearance between the seal body 8 and the sleeve 4 forms a tapered passage 16 extending from the inside of the bearing to the outside as the diameter increases from the inner diameter to the outer diameter.

In the bearing having the above-described structure, foreign matter such as muddy water that has entered the passage 16 is cut off by the dust lip 7 and is blown to the outer diameter side by centrifugal force generated by the rotation of the sleeve 4 or the seal body 8. Along the passage 16 extending to the outside.

Also, at the time of stop, the outside is discharged without collecting in the seal by the passage 16 on the lower end side of the shaft. In other words, although the illustration is upward in the illustrated example, when the bearing is arranged horizontally, the passage 16 is inclined in a direction of expanding outward, so that foreign matter such as muddy water flows from the passage 16 located at the lower end of the shaft. Will be discharged.

(Effects of the Invention) The present invention has the above configuration and operation, and can realize a bearing seal having a function of discharging foreign matter such as muddy water that has entered while maintaining the sealing function of the conventional dust lip. .

And, due to the effect of discharging foreign substances such as muddy water, the wear of the dust lip is reduced, and the life can be further extended. Also, since the sleeve and the metal ring have end faces flush with the end faces of the inner race and the outer race on the outer side of the bearing, respectively, the relative position in the axial direction between the sleeve and the metal ring is reliably determined, Since the state of contact of the dust lip with the sleeve is kept constant, there is no variation in sealing performance for each product, and good sealing performance can always be obtained.

Further, since the sleeve is provided with an outward flange extending from one end of the inner ring portion in the outer radial direction and at the other end of the inner ring portion so as to be inclined, the sleeve is required in the rectangular space in the cross section of the bearing seal. And a function of discharging the foreign matter can be effectively achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an essential part of a bearing seal according to an embodiment of the present invention, and FIGS. 2 to 4 are longitudinal sectional views of an essential part of a conventional bearing seal. DESCRIPTION OF SYMBOLS 1 ... bearing seal 2 ... inner race 3 ... outward flange 4 ... sleeve 5 ... outer race 6 ... inclined surface 7 ... dust lip 8 ... seal body 9 ... Inner ring, 10 Metal ring 11 Rubber elastic body 12, Outer ring 13 Inward flange 14, First rubber part 15 Second rubber part 16, Foreign matter removal Discharge passage 17 …… Gap

Claims (1)

(57) [Scope of request for utility model registration] A cylindrical inner ring (9) fitted on the outer periphery of an inner race (2) and an inner ring (9) extending radially outward from a bearing inner end of the inner ring (9). An outwardly extending flange (3) extending obliquely to the outside of the bearing of
A sleeve (4) formed so that the bearing outer end of the inner ring portion (9) is flush with the bearing outer end surface of the inner race; and a cylindrical shape fitted on the inner periphery of the outer race (5). An outer ring portion (12) and an inward flange portion (13) extending radially inward from the bearing inner end of the outer ring portion (12), and the outer bearing portion of the outer ring portion (12) is A metal ring (10) formed so as to be flush with an end face of the race outside the bearing, wherein the metal ring (10) is an inclined surface (6) of the flange (3).
A dust strip (7) that comes into sliding contact with the outer ring portion (12), and a passage for discharging foreign matter whose diameter increases from the inside of the bearing toward the outside of the bearing is provided on the inner peripheral side of the outer ring portion (12). Bearing seal.