JPH06506U - Rolling mill roll neck bearing device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a hermetically sealed bearing device for a rolling mill roll neck, the internal pressure and the amount of lubricant are appropriately adjusted while preventing the intrusion of water from the outside. A rolling mill roll neck including a bearing 1 having a plurality of roller rows, a lubricant passage 6 capable of supplying a lubricant to the inside of the bearing 1, and a seal 2 for sealing both axial ends of the bearing 1 In the bearing device, the member 5 to which the seal 2 is attached is formed with a communication hole 8 that communicates axially outward from the inside of the bearing 1 at the upper circumferential portion thereof, and the spacer 9 of the bearing inner ring 1a is formed.
A lubricant through hole 11 with a pressure adjusting valve 10 is formed in the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hermetically sealed bearing device attached to a roll neck of a rolling mill, and more particularly, to a structure for maintaining an appropriate pressure and lubricant amount inside the bearing.

[0002]

[Prior art]

 As a bearing device attached to a roll neck of a rolling mill, there is a sealed type in which seals are provided at both ends in the axial direction. As a conventional example thereof, FIG. 5 shows a sectional structure of a four-row tapered roller bearing device.

In the figure, reference numeral 21 is a bearing, 22 is a seal that seals both axial ends thereof, 23 is a bearing case, and 24 is a collar.

The bearing 21 is composed of an inner ring 21a divided into two in the axial direction, an outer ring 21b divided into three in the axial direction, four rows of tapered rollers 21c, and a cage 21d. The seals 22 are provided by the collar ring 25 at both axial ends of the outer ring 21b. The bearing case 23 includes a case body 23a at the center and end portions 23b at both ends thereof. In the bearing case 23, a lubricant passage 26 for supplying a lubricant to the inside of the bearing 21 is formed. The collar 24 is fitted onto the roll neck so as to abut against the bearing inner ring 21a. An outer seal 27 is provided between the collar 24 and the bearing case 23 in a plurality of steps (only two steps near the bearing 21 are shown in the drawing).

In the above structure, the lubricant filled in the bearing 21 is sealed by the seals 22 at both ends so as not to leak to the outside. If the lubricant leaks to the outside due to long-term use and the amount of the lubricant is insufficient, the lubricant is replenished through the lubricant passage 26.

[0006]

By the way, in the above-described hermetically sealed bearing device, since both ends of the bearing 21 are sealed by the seals 22, when the lubricant is replenished, the resistance against filling is large, and The lubricant does not flow in easily. Therefore, it is necessary to press-fit the lubricant at a high pressure, and it takes time and labor to replenish the lubricant.

Further, since a high filling pressure is required to replenish the lubricant, the pressure may cause the seal 22 to reverse, and the sealing performance of the seal 22 is halved, resulting in premature damage to the bearing 21. May be invited.

Further, the inside of the bearing 21 may be filled with a lubricant of 30 to 40% of its internal volume, but since the lubricant is filled with a high pressure, a large amount of the lubricant is supplied. It may end up. In that case, the lubricant is agitated with the rotation, and the heat of the agitation may cause an abnormal temperature rise in the bearing 21 and burnout.

The inventors of the present application have considered that such a problem should be dealt with by using seals having through holes communicating with the inside and outside thereof at both ends of the bearing. In this case, it is considered that the internal pressure of the bearing is reduced when replenishing the lubricant, which makes it easier to replenish it, but on the contrary, water easily enters from the outside through the through hole of the seal and the original oil-water separation function of the seal deteriorates. There is a risk. Moreover, since most of the filled lubricant flows to the low pressure side, that is, the seal side, the lubricant tends to run short in the central portion of the bearing.

The present invention addresses such a conventional problem, and in a sealed bearing device, the internal pressure and the amount of lubricant are appropriately adjusted while preventing the intrusion of water from the outside. The task is to do so.

[0011]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention comprises a bearing having a plurality of roller rows, a lubricant passage capable of supplying a lubricant to the inside of the bearing, and seals for sealing both axial ends of the bearing. In the rolling mill roll neck bearing device, the member to which the seal is attached has a communication hole that communicates axially outward from the inside of the bearing at the upper part of its circumference, and pressure adjustment is performed on the spacer of the bearing inner ring. A lubricant through hole with a valve was formed.

[0012]

[Action]

 In the above structure, since the inside of the bearing is maintained at an appropriate pressure by the communication hole of the seal mounting member, when replenishing the lubricant, the lubricant flows in at a relatively low pressure with a low resistance. In this case, since the communication hole does not open in the lower part where water collects, it is difficult for water to enter. The filled lubricant flows to the seal side at both ends of the bearing and the side of the inner ring spacer having the through hole, so that it spreads throughout the inside of the bearing.

[0013]

【Example】

 Hereinafter, the details of the present invention will be described with reference to the embodiments shown in FIGS. Of these, FIGS. 1 and 2 relate to an embodiment of the present invention, FIG. 1 is a partial cross-sectional view of a bearing device, and FIG. 2 is an enlarged cross-sectional view of a collar ring portion which is a main part thereof.

As shown in FIG. 1, a bearing device according to this embodiment is a four-row tapered roller provided with a bearing 1, a seal 2 for sealing both axial ends thereof, a bearing case 3, and a collar 4. A bearing device is the same as the conventional example shown in FIG. Further, in the bearing device of this embodiment, the bearing 1 has an inner ring 1a divided into two axial directions, an outer ring 1b divided into three axial directions, four rows of tapered rollers 1c, and a cage 1d. It is also the same as the conventional example in that the seal 2 is provided by the collar ring 5 at both axial ends of the outer ring 1b. Further, the bearing case 3 is composed of a central case body 3a and end portions 3b at both ends thereof, and a lubricant passage 6 for supplying a lubricant into the bearing 1 is formed in the bearing case 3. The fact that it is present is the same as in the conventional example. Reference numeral 7 is an outer seal provided between the collar 4 and the bearing case 3.

The difference between this embodiment and the conventional example is that as shown in FIG. 2, a communication hole 8 is formed in a member to which the seal 2 is attached, that is, a collar ring 5, while a pair of inner rings 1a, That is, a lubricant passage hole 11 with a pressure adjusting valve 10 is formed in the spacer 9 sandwiched by 1a.

Here, the communication hole 8 of the collar ring 5 communicates with the outside of the bearing 1 through the through hole 12 formed in the case end portion 3 b, but the communication hole 8 is circumferentially formed over the entire circumference of the collar ring 5. The through holes 12 are formed at equal intervals, whereas the through holes 12 are formed at the same intervals as the communication holes 8 only in the upper half of the circumference of the case end 3b. Therefore, of the communication holes 8, the one located in the upper half of the circumference matches the through hole 12 of the case end portion 3b and communicates with the outside of the bearing 1 through the through hole 12.

The pressure regulating valve 10 provided on the spacer 9 of the inner ring 1a opens like a check valve when the internal pressure of the bearing 1 exceeds a certain value.

In the above structure, the communication hole 8 of the collar ring 5 serves as a pressure relief hole, so that the inside of the bearing 1 is maintained at an appropriate pressure by the communication hole 8 and the lubricant is compared when the lubricant is replenished. Inflow at low pressure with little resistance.

By the way, water may collect outside the collar ring 5 at the lower part of its circumference, and it is considered that the water may enter the inside of the bearing 1 through the communication hole 8. Since the lower half of the circumference of the receiver 1 does not open to the outside, the water accumulated outside the bearing 1 does not enter through the communication hole 8.

Since the lubricant filled in the bearing 1 flows to the low pressure side, that is, to the seal 2 side at both ends of the bearing 1 and the inner ring spacer 9 side having the through holes 12, the lubricant is kept inside the bearing 1. There are no areas where the lubricant is partially lacking.

Further, the lubricant is leached out through the communication hole 8 and the communication hole 12, so that the filling amount can be known, and a large amount of the lubricant can be prevented from being filled. Even if the lubricant is filled in a large amount, the excess lubricant flows out of the bearing 1 through the communication hole 8, so that the amount of the lubricant inside the bearing 1 is maintained at an appropriate amount.

3 and 4 are enlarged cross-sectional views of the collar portion of the bearing device according to another embodiment of the present invention. As in the embodiment of FIG. 3, a filter 13 may be provided in the communication hole 8. Further, as in the embodiment shown in FIG. 4, the communication hole 8 may be opened directly outside the bearing 1. In the example of FIG. 4, the communication holes 8 are formed only in the upper half of the circumference of the collar ring 5 to keep the mounting angle of the collar ring 5 constant, or to widen the circumferential distance between the communication holes 8. Therefore, it is necessary to prevent the communication hole 8 from being located at the lower part of the circumference even if the mounting angle of the collar ring 5 is changed.

[0023]

[Effect of device]

 As described above, in the present invention, the internal pressure of the bearing is adjusted by the communication hole, so that the lubricant can be replenished quickly and easily at a low pressure, and problems such as seal reversal do not occur.

Further, since there is a communication hole and a communication hole with a pressure adjusting valve, a proper amount of lubricant is spread throughout the bearing, so that the lubrication of the bearing can always be maintained in a good state. it can. Moreover, since the communication hole opens only in the upper part of the circumference, it is possible to prevent water from entering from the outside, and since the seal itself is not modified as in the past, the seal function is improved. It does not lower.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a bearing device according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the above embodiment.

FIG. 3 is an enlarged cross-sectional view of a main part of another embodiment.

FIG. 4 is an enlarged cross-sectional view of a main part of still another embodiment.

FIG. 5 is a partial cross-sectional view of a conventional bearing device.

[Explanation of symbols]

 1 bearing 2 seal 3 bearing case 5 collar (seal mounting member) 6 lubricant passage 8 communication hole 9 spacer 10 pressure regulating valve 11 through hole

Claims (1)

[Scope of utility model registration request] 1. A rolling mill roll neck bearing device comprising: a bearing having a plurality of roller rows; a lubricant passage for supplying a lubricant into the bearing; and a seal for sealing both axial ends of the bearing. In the member to which the seal is attached, a communication hole that communicates from the inside of the bearing to the outside in the axial direction is formed in the upper circumferential portion of the member, and a lubricant passage with a pressure adjusting valve is formed in the spacer of the bearing inner ring. A rolling mill roll neck bearing device characterized by the following.