JPS6018658Y2 - Seal device for multi-row roller bearing with cage lubricated with grease - Google Patents

Description

[Detailed description of the invention] This invention relates to a multi-row seal device with a cage that is lubricated with grease. In particular, it is used to maintain a seal on the end face of the outer ring of a multi-row roller bearing with a sealed cage that is pre-filled with grease. The rings are joined in a spigot to substantially extend the axial width of the outer ring;
An internal seal mechanism is provided for sealing between the outer and inner rings by bringing a contact type seal body held by the seal retaining ring into sliding contact with an outer ring portion formed to protrude in the axial direction at the end of the inner flange side of the inner ring of the bearing,
End seal mechanisms of any configuration are provided on both end sides of the housing, and a drainage hole is provided below the space between the internal seal mechanism and the end seal mechanism to remove water, dust, etc. around the bearing. The bearing is at least double-sealed against the intrusion of foreign matter, and the discharge hole is prevented from being clogged due to leakage of grease from the inner ring of the bearing, ensuring that foreign matter such as water and dust is discharged from the discharge hole. In addition, the structure of the internal seal mechanism has been simplified so that it can be handled integrally with the bearing, and at the same time, the sealing performance has been improved.
It is designed to be able to be used with high reliability over a long period of time at low manufacturing cost.

Various bearing sealing devices have been developed in the past.

For example, the bearings that are attached to the roll necks of rolling mills that use large amounts of water to cool the rolls and support the rolls have many innovations in their sealing devices (
For example, Utility Model Registration No. 897931).

However, although these conventional devices are effective to some extent, they have a complicated structure and require many special processes to manufacture parts, which not only poses problems in terms of cost but also increases the size of the device. There was a tendency.

Further, these conventional devices cannot prevent water, dust, etc. that have accidentally entered the bearing mechanism from entering the bearing mechanism by discharging the water or dust.

Particularly in the bearing industry, an extremely large number of types of bearings are required with high precision, and manufacturers must accurately meet this wide variety of demands.

In this sense, the structure of the bearing is required to be as simple as possible, not only to reduce production costs but also to have high reliability.

Therefore, it is necessary to simultaneously simplify the structure and improve the functionality of the sealing device.

This invention is primarily intended to solve this problem.

The purpose of this invention is to improve the function of the bearing sealing device, and the purpose of this invention is to simplify the structure of the bearing sealing device.
The purpose of this invention is to improve the reliability and life of bearings, and also to reduce manufacturing costs.In particular, the purpose of this invention is to develop a seal that is most suitable for bearings applied to roll necks of rolling mills. The goal is to provide equipment.

That is, as in the illustrated embodiment, this invention substantially reduces the axial width of the outer ring 5 by providing a seal retaining ring 12 on the end face side of the bearing outer ring 5, which is closely connected to the end face and joined with a spigot. The seal retaining ring is attached to the outer circumferential surface of the outer ring portion 4a, which is elongated and formed by causing the end portion of the inner collar 4b of the bearing inner ring 4 to protrude in the axial direction beyond the edge 5b of the raceway surface 5a of the bearing outer ring 5. An internal seal mechanism 2 that seals between an outer ring 5 and an inner ring 4 by slidingly contacting a contact type seal body 14 held by an inner ring 12.
A space 25 between the internal seal mechanism 20 and the end seal mechanism 30 includes The present invention relates to a sealing device for a multi-row roller bearing with a cage lubricated with grease in a rolling mill, characterized in that a discharge hole 27 independent from the sealing mechanism 20.30 is provided on the lower side of the bearing.

Therefore, the sealing device of this invention is particularly suitable for bearings in parts such as the roll neck of a rolling mill that come into contact with a large amount of water for cooling the rolls and surrounding scale and dust. The bearing is not limited as long as it is a multi-row roller bearing with a cage that is lubricated with grease, and can be used in a wide range of applications with just a few changes in design.

Below, this idea will be applied to a four-row tapered roller bearing that supports the roll neck of a rolling mill.1. Examples will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a housing, which is called a chock in the case of a rolling mill.

Therefore, this will be referred to as chock 1 hereinafter.

Inside the chock 1, there are 4 shafts 41 of rolls (not shown).
It is supported via a row tapered roller bearing 3.

In the case of a rolling mill, the shaft of the roll is called a roll neck.

Therefore, this will be referred to as the roll neck 41 hereinafter.

The four-row tapered roller bearing 3 has four rows of tapered rollers 7 movably brought into contact between two double-row inner rings 4, two single-row outer rings 5, and one double-row outer ring 6. However, only a part of it is shown in the figure.

R is a cage that holds and guides the rollers 7.

Reference numeral 8 denotes an inner ring spacer closely interposed between the joint end surfaces of the double-row inner rings 4, 4, and numeral 9 denotes an outer ring spacer closely interposed between the joint end surfaces of the single-row outer rings 6.

The inner ring spacer 8 and the outer ring spacer 9 are both clearance adjusting members inside the bearing, and the inner ring spacer 8 is generally formed with a small hole in the diameter direction by cutting out its end face, but this invention is particularly suitable for this invention. In the embodiment, the inner ring 4 and the roll neck 41
In order to prevent water, dust, etc. from entering the outside of the bearing 3 and leakage of the lubricant sealed inside the bearing 3 through the fitting clearance between the bearing 3 and the bearing 3, the structure does not have the small holes.

Reference numerals 10 and 11 indicate lubricant replenishment holes provided in the outer ring 6 and outer ring spacer 9, respectively, and lubricant (grease) is supplied to the inside of the bearing 3 as necessary through the supply holes 10 and 11. .

The inner ring 4 of the bearing 3 has its axial side end (the rear end of the chock 1) on the side of the inner collar 4b extended in the axial direction, so that the end edge of the raceway surface 5a of the outer ring 5 is formed. An outer ring portion 4a is formed that projects further in the axial direction than 5b (in this embodiment, the end surface of the outer ring 5).

The outer diameter of the outer ring portion 4a is smaller than the outer diameter of the end portion on the side of the inner collar 4b.

Further, a seal retaining ring 12 is connected to the axial side end of the outer ring 5 with a spigot joint so as to be brought into close contact with the end surface of the outer ring 5.

Thus, the axial width of the outer ring 5 is extended via the seal retaining ring 12 to a length that is substantially equal to the axial width of the inner ring 4, and the outer peripheral surface of the outer ring portion 4a of the inner ring 4 and the seal retaining ring An annular groove 13 is formed between the inner circumferential surface of the groove 12 and the inner circumferential surface of the groove 12 .

A contact type seal body 14 is fitted into the annular groove 13 and held by the inner peripheral surface of the seal retaining ring 12, and the lip of the seal body 14 is slid onto the outer peripheral surface of the outer ring portion 4a of the inner ring 4. Let them come into contact with you.

Thus, the bearing 3 is provided with an internal seal mechanism 20 at its axial end for sealing between the outer ring 5 and the inner ring 4.

Furthermore, in addition to the internal seal mechanism 20 having the above-described configuration, the roll neck 41 includes an end face side seal mechanism 30 for sealing the bearing 3 at a position axially outward from the internal seal mechanism 20 at the rear end of the chock 1. It is set in.

A step 15 is formed on the inner peripheral side of the rear end of the chock 1, and the end surface of the seal retaining ring 12 is brought into contact with the step 15 to position the outer ring 5 in the axial direction.

Further, on the inner circumferential side of the chock 1, a rib 16 is located slightly axially outwardly from the stepped portion 15 and protrudes radially inwardly.
will be established.

Thus, the rib 16 allows the internal sealing mechanism 20
A concave ring 17 is formed which faces the seal body 14 at an appropriate interval.

An appropriate distance is maintained between the inner peripheral surface of the chock 1 and the roll neck 41, and a seal body 1B is installed between the inner peripheral surface of the chock 1 on the end surface side and the roll neck 41.

In this way, the end sealing mechanism 30 at the rear end of the chock 1 is configured.

The seal body 18 of the end face side seal mechanism 30 is preferably a contact type oil seal, but is not limited to a contact type, and may be a non-contact type such as a labyrinth. Combinations and other seal formats can be selected as appropriate.

Therefore, between this end face side sealing mechanism 30 and the internal sealing mechanism 20, there is a chock 1 of the outer ring portion 4a1 of the inner ring 4.
Concave ring 17 of rib 16, chock 1 and roll neck 41
A space 25 is formed surrounded by the circumferential surfaces of the .

Below this space 25, both the seal mechanisms 20.3
A discharge hole 27 independent from 0 is provided.

In the illustrated embodiment, the discharge hole 27 is located at the seal retaining ring 1.
The discharge hole 27 is opened in the chock 1 adjacent to the end face of the hole 2, but the opening position of the discharge hole 27 may be selected as appropriate at any position below the space 25, and the number of opening holes is 1. It is not limited to , and may be plural.

Internal seal mechanism 20 and end seal mechanism 30 configured as described above
, and the sealing device that is ejected from the discharge hole 27 provided in the space 25 between the internal seal mechanism 20 and the end seal mechanism 30 is located at the other axial end of the bearing 3 and the roll neck 41 (the front end of the chock 1). Section) is also provided in the same manner.

In the above-mentioned embodiment, centering of each component is relatively difficult to fit into the chock, as is the case in general.

For this reason, there is also a method in which these parts are fitted into a cylinder in advance and guided into the chock by this cylinder.

Alternatively, you can center each part before inserting it into the chock, fix the whole thing together by sandwiching it between a bolt and a clamping plate, insert it into the chock, and then remove the bolt and clamping plate. be.

In the embodiment described above, since the outer diameter of the outer ring portion 4a of the inner ring 4 is smaller than the outer diameter of the end on the side of the inner collar 4b, when assembling the retainer R and the roller 7 to the inner ring 4, The outer ring portion 4a does not get in the way, and the bearing can be easily assembled.

In addition, by making the outer ring portion 4a of the inner ring 4 small in diameter as described above, the seal retaining ring 12 and the outer ring portion 4a of the inner ring 4 are
Since the annular groove 13 can be formed with a wide interval in the radial direction between the seal retaining ring 12, restrictions on the design of the seal body 14 held by the seal retaining ring 12 can be relaxed, and a structure that meets the desired performance can be selected as appropriate. It is now possible to select
Improves sealing performance.

As mentioned above, this idea is based on the internal seal mechanism that seals between the outer ring and the inner ring in a grease-lubricated multi-row roller bearing with cage, and the internal seal mechanism that seals between the outer ring and the inner ring, and the internal seal mechanism that seals between the outer ring and the inner ring, and the An end face side sealing mechanism is provided,
Further, a discharge hole independent from both the seal mechanisms is provided below the space between the internal seal mechanism and the end face side seal mechanism to constitute the seal device.

For this reason, foreign substances such as water and dust outside the bearing should first be removed.
Its intrusion is prevented by the end face side sealing mechanism.

In addition, even if some of these foreign substances break through the end face seal mechanism and enter, they will be reliably captured in the space and will not leak before the internal seal mechanism, and will be reliably discharged from the discharge hole to the outside of the bearing. Therefore, it will not penetrate into the bearing beyond the internal seal mechanism.

Even if it penetrates beyond the discharge hole, the internal seal mechanism prevents it from entering the bearing inner ring, so it will be sequentially discharged from the discharge hole.

In addition, a seal retaining ring is connected in a spigot to the outer ring of the bearing of this invention, and the seal body held by the seal retaining ring is in sliding contact with the outer ring of the inner ring, so that the seal retaining ring is accurately positioned relative to the inner ring. can be aligned.

Therefore, the contact pressure of the lip of the seal body against the inner ring is uniform over the entire circumference, preventing uneven wear of the lip, maintaining extremely good sealing performance, and preventing foreign matter from entering from outside the bearing. Not only is it reliably prevented, but the grease sealed inside the bearing does not leak out, so the discharge hole is not blocked by leaked grease, and the foreign matter can be discharged from the discharge hole extremely smoothly and quickly. It is done.

Furthermore, since the internal sealing mechanism of this invention effectively exhibits its performance over a long period of time, there is almost no need to replenish grease, making it possible to significantly reduce the amount of grease used.

Furthermore, the seal retaining ring of the internal seal mechanism of this invention is
Since the seal body is held by substantially expanding the axial width of the outer ring by connecting it to the end face of the bearing outer ring, the forming process is easier than when the axial width of the outer ring itself is expanded. Not only is it easy to process, but it can also be machined using inexpensive materials other than bearing steel, making it possible to significantly reduce manufacturing costs. There is no risk of loss of bearing accuracy.

Furthermore, the internal seal mechanism of this invention is constructed so that it can be assembled into the bearing and handled integrally with the bearing, making it easy and quick to install or remove it within the housing. The lip of the seal body will not be damaged when installing the bearing.

Therefore, according to this invention, it is possible to obtain a sealing device with an extremely simple structure and excellent sealing performance, and it is highly reliable over a long period of time as a sealing device for grease-lubricated multi-row roller bearings with cages. Since the sealing device can be used as a sealing device for roll neck bearings in rolling mills, excellent effects can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of this invention. In the figure, 1 is the housing, 4 is the bearing inner ring, 4a is the outer ring of the bearing inner ring, 4b is the inner collar, 5 and 6 are the bearing outer rings, 5a, 5
b is the raceway surface of the bearing outer ring and its edge, R is the retainer, 12 is the seal retaining ring, 14.18 is the seal body, 20 is the internal seal mechanism, 25 is the space, 27 is the discharge hole, and 30 is the end face. It is a side seal mechanism.

Claims (1)

[Claims for Utility Model Registration] 1. A seal retaining ring is provided on the end face side of the bearing outer ring, which is closely connected to the end face and spigot-bonded to substantially extend the axial width of the outer ring, and A contact type seal body held by the seal retaining ring is brought into sliding contact with the outer circumferential surface of an outer ring portion formed by making the inner flange side end protrude beyond the edge of the raceway surface of the bearing outer ring in the axial direction. An internal seal mechanism for sealing between an outer ring and an inner ring, and an arbitrarily configured end seal mechanism provided on both end sides of the housing axially apart from the internal seal mechanism, and the internal seal mechanism and the end seal mechanism. A sealing device for a multi-row roller bearing with a cage lubricated with grease in a rolling mill, characterized in that a discharge hole independent from the sealing mechanism is provided below a space between the . 2 Utility model registration claim No. 1 in which the outer diameter of the outer ring of the bearing inner ring is smaller than the outer diameter of the inner flange side end.
A multi-row roller bearing sealing device with a cage that is lubricated with grease as described in 2.